Field of PVC processing aid applications overview of some of the development

Plasticizer addition, other competitors to enter the market to make additives become more enthusiastic. " Plasticizer market WSD one pack stabilizer  is very active in recent years ." Renewable energy technologies have significant market interest , as an alternative to traditional petroleum-based plasticizer raw materials. Benzoate, phthalate plasticizers. Reportedly showed that a plasticizer having a low viscosity compared to traditional , conventional defects can be eliminated to improve the  WSD PVC plasticizer efficiency of the production process and also as a heat stabilizer and a stabilizer formulation to reduce demand .
Other PVC additives company also announced this year , and some claim that " green" ( or at least the plant ) . By chemical modification of soybean oil -based wax. The company claims that when the injection molding, its performance is superior to the fatty acid -based lubricant , stronger liquidity and dimensional stability. When used in the manufacture of rigid PVC is particularly suitable , especially cadmium or WSD Polyethylene wax  zinc extrusion steady stable PVC or tin.
Earlier this year, for the production of calendered or extruded sheet and profiles . Especially those who need to print , composite , or a combination . Pick some plant materials ( non-animal ) as is said to provide the same optical performance and handling characteristics as a standard lubricant .

Zinc stearate coatings more extensive use

Zinc stearate is mainly used in paint wood primer , from filling role in enhancing sexual polished . Transparency, transparency affect paint small, especially for transparent primer. With the direct method zinc stearate manufacturers gradually increased, so that under the pressure of competition in the domestic zinc stearate coatings performance has been dramatically improved. In addition to zinc stearate coating focus sanding and transparent , but also some other factors such as overall  Stabilizers for pipe performance oil absorption, thickening , particle size, dispersion and so on Wood have also been affected. Zinc stearate in wood primer There are several major technical indicators affect the performance of its paint : 1 , primer sanding of the wood , polished performance is a very important indicator in the paint , the usual method is to use the same test the coating formulations , while polished plate spray test in the same time , there is no fixed standard . 2 , transparency transparent primer , the transparency level of direct impact on the appearance of wood . Therefore, the water produced with zinc stearate is not transparent in the wood , mainly because of too many impurities . The direct method in the production of zinc stearate is able to meet the requirements of purity , but also a very high process requirements , a significant impact of different production processes for transparency , small differences may lead to huge differences in process on transparency .
3 , thickening the production of coatings manufacturers of zinc stearate thickening is not acceptable because the zinc stearate coating added to finished products , its viscosity determines factory index had settled down , even if the error is also in ± 500mP · s, so the test zinc stearate thickening method is generally used to  one pack stabilizer test rotary viscometer , viscosity and viscosity deviation good if just a few hours after the dispersion is greater than 500mP · s, regarded as thickening 4. suction oil absorption and thickening personally do not think the same concept , oil is in the same proportion of large amounts of added conditions to make the finished product viscosity, while the viscosity does not exceed a period of time to place the error value ± 500mP · s. Generally PU coating for oil absorption is not much demand because production will not have much impact , paint manufacturers have high requirements on oil absorption , which may be solvent paint manufacturers to add some more , and want to reduce the evaporation of the solvent , must find some high oil absorption material added to it , and oil absorption of zinc stearate relative to other additives are additives of high oil absorption .
5, the particle size of the indicators show that the particle size of the zinc stearate , are generally used to measure the degree of fineness . The easiest test is usually the result fineness fastest scraper fineness, generally adding a certain percentage of zinc in the alkyd resin dispersion , then add a little solvent viscosity good tune , then fineness meter testing, such test results are slightly larger than the actual fineness so, because the resin powder is wrapped in possession of a certain thickness , but as long as the standard set can be comparable and reproducible test method to measure this fineness is exceeded 6 , dispersed in paint Chlorinated paraffin  production process , there are many manufacturers mentioned dispersion problems. Under normal circumstances , zinc stearate dispersed in the paint is not a problem , but in the production process of zinc stearate , some indicators will also cause the dispersion of certain effects, such as zinc stearate acid value is too high , semi temperature is too high, there will be zinc in the coating dispersion of workers bad press pack too serious , but if the water is too high in zinc also appear crystallization problems , is considered dispersion bad .

pvc heat stabilizer some simple instructions

With many countries in the world for environmental awareness and increasingly severe environmental problems , related health problems in people's daily lives by everyone concerned . PVC products used as an extremely wide range of general plastic surface , in the traditional PVC heat stabilizers , containing heavy metals such as lead salt heat stabilizer has a good cost advantage , is widely used . However, with the plastic processing aid  deepening of understanding and found that in the manufacturing process have serious dust pollution, once absorbed by the body after can not be excreted , seriously affecting the health of production workers ; while PVC products containing lead salts in the course will be varies with time precipitation , which also affects the user 's health, especially in medicine and health, children's toys and food packaging-related products is particularly serious. Therefore, the traditional heavy metal toxic heat stabilizers will be fully replaced . Future PVC heat stabilizers are mainly concentrated in the direction of non-toxic calcium / zinc composite heat stabilizer and organic tin  titanium dioxide in two ways. Ca / Zn compound stabilizer due to excellent overall performance and cost-effectiveness will ultimately shape the future country PVC stabilizer system of the subject. It is also about to become the next phase of PVC heat stabilizers hotspot.
In summary , pvc heat stabilizer study related subjects in previous studies , based on the liquid calcium / zinc composite heat stabilizer metal soap synthesis and complex research to improve synthesis process , improve heat stabilizer comprehensive performance to meet the  PVC flame retardant future needs of multi-functional stabilizer for the relevant enterprises and research institutions to provide a reference . And soft , transparent PVC heat stabilizer complex study to improve thermal stability . If these problems are resolved , there will be our country's non-toxic environmentally friendly PVC heat stabilizers to a higher level , widening environmentally friendly composite heat stabilizer market and shorten the gap with foreign countries . For widening liquid calcium / zinc composite heat stabilizer field of use has a positive meaning , and will directly promote the upgrading and development of the PVC industry .

Wide range of uses stearate

Stearate is an additive for a wide range , the most important role of the polymer with very good results. Such as polyolefins can be used as an acid neutralizer , the article has a good lubricating effect , increase  chrome oxide life expectancy ( in terms of the thermoset product ) . Market , stearate great demand, generally focused on: calcium stearate, zinc stearate, sodium stearate these types . Lianyungang Huaming Tai Material Technology Co., Ltd. is mainly engaged in three types of stearate.
Production of stearic acid salt is a complex process, after several in-depth exchanges , Changzhou Yi degrees Drying Equipment Co. recommend my company developed flash dryer as stearate final  titanium dioxide rutile process section . More than two years , the use of easy -degree flash dryer for drying stearate effect is remarkable, not only high production efficiency, and fewer human resources needed , greatly reducing the cost of doing business .
 Drying stearate ( calcium stearate, zinc stearate, sodium stearate ), the main difficulty lies in mesh powder is too low, the drying time is not a good collection of dust than expected . Choose the traditional bag dust removal equipment can not solve this problem. Our response to this situation , the traditional baghouse has been improved, under the Plastic chemical  premise of ensuring the production , making the maximum amount of material was collected . Stearate using flash dryer drying , the effect is remarkable, and , again using the flash drying equipment high production requirements under full load operation. Tailored for the enterprise is the most suitable drying equipment drying machine I designed purpose . Communicate constantly , constantly solving puzzles , and constantly break through the self .

polyurethane material in the pipe Application

Have great use of the polyurethane material , the pipe also has a very large application . Anticorrosive material selection determines whether the long-distance oil and gas pipelines build quality . In the long-distance oil and gas pipelines construction, anti-corrosion  potassium stearate materials the basic requirements are:
( 1 ) Good electrical insulation: anti-corrosion layer between the opposite sides of a certain area of ​​resistance should be less than 10000Ω · m2; resistant strength not less than the breakdown voltage spark detector test voltage standard.
( 2 ) resistance to cathodic stripping : coating should have a certain ability to ensure corrosion resistance to cathodic stripping layer  PVC stabilizer for fittings and the substrate can be effectively and stick together.
( 3 ) sufficient mechanical strength : a certain impact strength, handling and to prevent damage caused by the soil pressure ; has good bending resistance , to ensure that the pipe construction not be damaged by bending ; has better wear , so as to prevent damage due to soil friction ; the pipe has good adhesion.
( 4 ) Good Stability: resistance to antimony oxide  atmospheric aging properties ; chemical stability ; good water resistance, low water absorption ; has sufficient heat resistance ; resistance, low temperature performance, ensure its stacked pull operation and construction no cracks, no shedding.
( 5 ) simple repair of : coating should be easy to repair after damage , saving construction time.
( 6 ) anti-microbial properties .

Supply of PVC impact modifier intended use

Second, the main performance:
1, can be used as a polymeric plasticizer , and in the long-term use will not migrate to the product surface precipitation .
2, low temperature performance blends , polarity, anti-UV, anti- chemical and microbiological corrosion performance improved significantly .
3 , added to the PVC, ABS or PVC / ABS alloy to improve its thermal stability.
4 , the European regulatory approval for food contact industry .
5, in the PVC processing , Elvaloy ® 4924 can significantly improve the impact properties, including low-temperature impact resistance .
Third, the theoretical basis and the  oxidized PE WAX impact modifier advantage
PVC low-temperature impact strength are the main reasons is because a strong PVC molecules caused by intermolecular forces , because PVC strong molecular attraction between molecules makes PVC products subjected to external shock , PVC molecules difficult to produce the relative displacement , so that the impact energy can not be effectively converted to internal frictional heat , resulting in rupture of the material . Adding a plasticizer , CPE PVC because reducing the attraction between the molecules leaving the improved impact strength , but low molecular weight organic plasticizers are added when less easy to precipitate , and an anti- volatile plasticizing effect instead, the material becomes brittle and will greatly reduce the use of a large number of mechanical properties , it is difficult to use in hard products . The CPE of the polymer precipitated polymer although there is no problem , because its glass transition temperature above -10 ℃ , so the low temperature impact performance is not ideal. DuPont Elvaloy 4924 is an ethylene - vinyl acetate carbonyl (E / VA / CO) copolymer , molecular weight PVC rather , is a permanent plasticizer , not precipitated , anti-migration , can significantly reduce the intermolecular force PVC , the glass transition temperature - 36 ℃, to overcome the carbon black powder  low glass transition temperature and the CPE plasticizers easy to produce anti- plasticization defects. Not only can greatly improve the impact properties of rigid PVC and can effectively improve the weathering resistance.
Fourth, technical indicators:
Melt index (g/10min) 9
Density (g/cm3) 1.03
Tensile Strength (Psi) 1580
Elongation at break ( % ) 736
Glass transition temperature (℃) -36
Melting point (℃) 70
Solubility parameter 8.68
Five , the main application
1 , rigid PVC: improved formability , reduce subsequent vacuum forming temperature , forming speed faster , improve  plastic processing aid impact resistance ;
2, soft PVC: to increase weather resistance , low temperature resistance , chemical resistance and no -shift problems and improve impact resistance
3 , Footwear: with rubber handle, can increase wear and slip effect , against the soapy water and oil also increased many aspects of behavior .
4 , Other : PVC cable , PVC film, PVC leather and PVC and rubber blend products.

fluorescent agent Mask

There are said to be sisters children recently spent a mask effect is super good , the skin becomes special white . Deposited on a one day together , come up with the mask is also very common packaging, the  PVC flame retardant inside one , or non-woven fabric , is said to try it . Day by day, the rinsing mask, I felt really white , and no one around to do the mask on the skin than obvious. Effect is really good , it really makes me this mask admiration. Friends also very pleasantly surprised to say it is only a few dollars , so inexpensive things , I feel really find the gems . Finished I'll pick up a bit and sisters out to dinner , because it is noon , outside the sun king , to the outside I found my sister 's face is so strange , ah, glowing , particularly bright ! To be honest white, but a little frightening wood there ! !
I would say , and she looked at my face , my face felt very strange ! ! !
After dinner , we hurried home. I was skeptical mask added fluorescent agent , and before my sister with a mask all night, she just felt it plainly, no attention else. Then checked the Internet
The following are network information
Adding the fluorescent whitening agent in cosmetics should generally distyrylbiphenyl class of synthetic chemicals , but the resulting fluorescent substances may be natural extracts , it may be some compound component .
Although more than half of the plant extract containing a fluorescent component , but there is little to add cosmetics pure plant fluorescent substances. Fluorescent brighteners as a dye , is a chemical composition , are often added to cosmetics , can absorb invisible ultraviolet light , and then converted to a light blue fluorescence released , and can block light blue Face showing a gray-blue , it is very smooth face . Taipei ultimate dermatology president of Taiwan Society of Aesthetic Medicine Education Committee chairman Fon-Yi Sung said : "We are yellow , blue fluorescence in the hair of ' neutralizing ' down , you can make the brightness of the face itself is greatly improved, people have a washing face on white, bright face on Cawan Wei Shi functions . " What is the harm fluorescent agent ?
Whether natural or synthetic fluorescent agents will produce certain harm to the human body , especially the synthetic fluorescent brighteners, there are certain risks , is easy to migrate to the stratum corneum , the blood , causing mutations that may cause cancer , there are also may lead to human rejection , people allergies.
Detergents on the fluorescence agent already has added ceiling , skincare , there are no requirements. After all, did not care fluorescent agent functions after entering the skin is difficult to be metabolized , so no  low molecular polyethylene fluorescent agent should try to choose products more at ease.
How to detect whether a mask containing the fluorescent agent ?
Can verify the authenticity of banknotes ultraviolet light , you can also use a professional Wood's light , illumination in the dark mask, to see whether the dissemination of light blue fluorescence , basically you can determine most of the mask , of course , not all contain fluorescent the can see.
So the sisters must be careful ah , whitening products effective too fast, probably have a bad component , can cause bodily injury ! ! !
Also , another thing that makes me very chilling , even if this mask with a fluorescent agent blatant kind of thing , but it can still be seen on the packaging QS quality and safety logo, the logo should be inspected on behalf of this thing right ? But such products to the market actually has , let me chilling ah ... our quality on the market of food, supplies and even cosmetic issues , reported on TV as long as a consumer to polish his eyes always say , know how to identification, if we consumers know everything, what will be identified , it is up to the quality inspection departments is what to do with it ?
If there is no good mechanism to test , then we will have to identify themselves , to everyone's beauty and health,
I am now to popularize some of this knowledge .
Commonly used fluorescent agents  pvc additive are zinc silicate , zinc sulfide cadmium, fluorescent yellow , Morin and so on. According to the chemical structure can be divided into five categories : ① stilbene , and certain synthetic fibers for cotton fiber , paper , soap and other industries , with a blue fluorescence ; ② coumarin type, with cumarone basic structure , for celluloid , polyvinyl chloride , etc., with a strong blue fluorescence ; ③ pyrazolone type , for wool, polyamide, acrylic and other fibers , a green fluorescent color ; ④ benzo oxygen and nitrogen , was used in acrylic and other fibers and polyvinyl chloride , polystyrene and other plastics , with a red fluorescence ; ⑤ phthalimide type, used for polyester, acrylic, nylon and other fibers , with a blue fluorescence.
Its main components : stilbene derivatives , such as some lipstick, in which the detergent contains a fluorescent agent. When you use the mask must pay attention to , it's best to experiment in the hand , do not directly in the face.
There is no need to rush , whitening is the result of long-term adherence , and can not bear fruit in a few days . General leather skin metabolism cycle is 28 days , to go through the complete cycle , skin whitening ingredients to complete metabolism, inhibit melanin formation , makes a good whitening effect . Use the mask for three consecutive days , there will be some effect . The best selection of botanical skin care products.

Calcium stearate uses some of the main

 Heat stabilizers for PVC and a variety of plastics processing lubricant , release agent . In rigid products , and  aluminium hydroxide the base of lead salts , lead soap can increase the gelation speed. Also used in food packaging, medical equipment and other requirements nontoxic soft film and equipment. Can be made of polyethylene , polypropylene, halogen absorbent to remove the residual catalyst on the adverse effects of color and stability . As a plasticizer in rubber processing , make the whole into a natural rubber and rubber softening , and almost no effect on curing . Also used as a molding of polyolefin fibers and lubricants , grease thickening agent, textile  black iron oxide waterproofing agent, paint flatting agent , when manufacturing plastic LP plasticizers. Also used in pencil manufacturing and pharmaceutical , perfume industry . Polyolefin polyolefin acid neutralizer color stability and corrosion have a direct contribution ;
Lubricating / processing aids improve the polyolefins, polyamides , styrene and rubber in the extrusion molding ( film, fiber , profiling , etc. ) , and press molding processability.
Release properties of the thermoplastic plastics , rubber, and thermoset articles, such as unsaturated polyester polyurethane foam . Storage
The product packaging woven bag lined  Plastic chemical with plastic bag, 20KG or 10KG, stored in a cool , dry place , away from sources of fire , moisture , heat, not with acid, alkali and corrosive substances mixed Commonwealth Games .

how to distinguish good plasticizer

Resin has good compatibility , compatibility is insufficient, the pneumatic tube plasticizer separated from the resin , the performance of exudation, sweating phenomenon. Pneumatic tubes zinc stearate  incompatible with the resin plasticizer , plasticizing efficiency of the question.
Plasticizer variety, then have what conditions it can be called a good plasticizer , today teach you the recipe :
1 . High plasticizing efficiency , with less to obtain a higher amount of added plasticizing effect .
2 . Good compatibility with resin , compatibility is insufficient, the pneumatic tube plasticizer separated from the  chromium oxide resin , the performance of exudation, sweating phenomenon. Pneumatic tubes incompatible with the resin plasticizer , plasticizing efficiency of the question.
3 . Low volatility, reduce and pneumatic tube forming volatile loss during storage for pneumatic tube performance. Car decoration , wire and cable and other areas have higher requirements for volatile . 4 . Durability , water , oil, organic solvent extraction .
5 . Do not migrate , pneumatic tube plasticizers are not supposed to come into contact with other solid medium diffusion .
6 . Cold, and requires the processing temperature is still good softness . This agricultural films and outdoor use  aluminium stearate pneumatic tubes is very important.
7 . Good heat resistance , requiring the use of higher processing temperatures and temperature stable .
8 . Non-toxic, tasteless , odorless and colorless.
9 . Good resistance to fungal
10 . Flame retardant
11 . Good electrical insulation
12 stain resistance, chemical etching
13 . When the plastisol is used , requires that the preparation of the plastisol viscosity stability is good.

Why do we need PVC heat stabilizers Processing

PVC heat stabilizers Processing Why do we need ?
PVC is the first ideal structure - tail structure -CH2-CHCl-CH2-CHCl-, is quite stable . But so far the PVC synthesis method can not be like synthetic butadiene rubber , as the role of catalyst in  stearate aluminum Jigger so there are rules for orientation cis butadiene polymerization .
Radical polymerization of vinyl chloride is a random polymerization , in addition to its first stable - tail structure , there are first - the first structure - CH2-CHCl-CHCl-CH-, tail - tail structure -CHCl-CH2-CH2-CHCl - ; generating a coupling disproportionation vinyl Results CH2 = CH-CHCl-CH2- structure and allyl chloride -CH2-CH = CH-CHCl-CH2 and so on .
Generated in the PVC synthetic allyl chloride, chlorine and tertiary carbon double bond in its molecular chain structure  magnesium stearate instability , unstable order : PVC within the molecular chain allyl chloride > tertiary carbon Chlorine > allyl end groups chloride > Chung chlorine. PVC is susceptible to degradation during processing because of the structure of PVC molecular chain instability exists , if not modified for stabilization , the decomposition temperature is about 130 ℃ , but that the PVC resin processed into useful articles , molding temperature to at above 190 ℃ . Therefore , you must add heat stabilizers stabilize its structure improvements.
Pvc in the synthesis process so you need to add PVC heat stabilizers.

The main component of the phosphor

In order to understand the chemical composition of the phosphor , we first think of the firefly 's light, firefly light-emitting principle mainly in the following series of processes . Protein + into light into light into light oxygenated enzyme protein ( glows green ) protein + H2O oxygen into light into light firefly protein that is why can continue to light , and bright twinkling reason , it is worth noting that green light emitted by the firefly is a " cold light ", the results of conversion as plastic additive high as 97% . Secondly , we note that the light emitting plastics , light plastics mainly in common plastic braced little radioactive substances, such as 14C, 35Sr, 90Sr , and Na, Th and a luminescent material ZnS, CaS these sulfides of the irradiation light radiation , is excited and emitted visible light ( luminescence ) . Consisting of: Pink color density formula category Y2O3: Eu white 5.1 ± 0.2 green powder CeMgL11O19: Tb white 4.2 ± 0.2 Blue Pink BaMgAl10O17: Eu white 3.7 ± 0.2 bimodal powder blue BaMgA10O17: (Eu, Mn) 3.8 ± 0.2 on white conversion phosphor, the phosphor is excited infrared composition: chemical composition : YErYbF3 appearance: white inorganic powder, grain size : 30nm excitation wavelength : 980nm color: green features : high transmittance , a higher  iron oxide black solvent resistance, luminescence properties of acid substance is broadly divided into two categories: one is the material heat, heat radiation and light, the other is an object absorbs energy and is excited to an excited state ( non steady state ) back to the ground state in the anti- process releases energy in the form of light . Matrix and rare earth compounds as activators in rare earth luminescent materials and more in the latter category , that rare earth phosphor . Rare earth atom has a wealth of electronic energy levels , because rare earth atom electron configuration 4f orbitals exist , for a variety of energy level transitions to create the conditions to obtain a variety of light-emitting properties. Rare luminescent material is a huge treasure in human development of the various light-emitting materials , the rare earth elements plays a very important role. Cathode-ray emitting material - display phosphors mainly used in televisions, oscilloscopes, radar and other types of computer screen and monitor. Rare red phosphor (Y2O3: Eu and Y2O2S: Eu) for color TV screen , the brightness of the TV to achieve a higher level . Blue and green phosphors are still using non- rare earth phosphors, but La2O2S: Tb ​​green phosphor luminescence characteristics of a good , there is development prospects. Recently color TV unified use EBU ( European Broadcasting Union ) color , Pink is Y2O2S: Eu. The computer does not like the color television that the  plastic processing aid reproducibility of importance , and priority to brightness , and thus stronger in orange red , Y2O2S Eu in an amount of usually 5 ~ 7wt%. Pink color television in the Eu content of about 1.5 times the computer . When the light is a substance into another substance shine again when the back is chemical energy into

PVC PVC heat stabilizers factors affecting

PVC heat stabilizers of PVC to a certain extent affect the transparency . PVC heat stabilizers are also PVC additives can not be missing , so no PVC heat stabilizers for PVC will lose a lot of practical value. So people are constantly on the PVC heat stabilizers titanium dioxide  biochemical research . Here polyvinyl chloride PVC heat stabilizers affect the transparency of the three factors , and we do a study . 1, the refractive index of the stabilizer
PVC resin, heat stabilizer and 1.52 to 1.55 of the refractive index of the visible light are the same or similar, then the better the transparency of PVC products , the transparency is low and vice versa .
2 , stabilizer  iron oxide black molecules ( molecules ) of linear length
Heat stabilizer molecule ( or molecules ) linear length is less than 400 ~ 735nm wavelength of visible light refracting fewer higher degree of transparency , whereas less transparent .
3 , a heat stabilizer in PVC , " solubility ", ie a so-called compatibility Compatibility means the mixing of two or more substances mutual affinity. Good compatibility is possible to achieve dispersion of the molecular level . Thermal stabilizer in the molten state has good compatibility with PVC resin . Do not form a two -phase , that is no  liquid stabilizer interface or the interface is not obvious, less refracted light , PVC products, higher transparency . Liquid stabilizer than the corresponding solid metal soap good compatibility in PVC , the linear molecule has a smaller length , and thus the higher the transparency of the PVC .

PVC lubricants narrative

PVC processing is an essential lubricant additives . Add appropriate amount of lubricant in PVC can reduce PVC and PVC particles before melting melt friction between macromolecules ; reduce PVC melt and the plastic flame retardant  friction between the contact surfaces of plastic machinery . Amount of lubricant can improve the PVC melt flow , improve production efficiency and to prevent friction and heat caused by PVC degradation and improve product appearance. Press the function can be divided into external and internal lubricant lubricants. PVC to poor external lubricant , the resin inside the melt easily migrate to the surface, forming a lubricant interface layer , thereby reducing the P PVC particles melt prior to melting the plastic mechanical friction between the contact surfaces . Lubricants containing a polar group , and has good compatibility with PVC , PVC can reduce intermolecular forces , reduce melt viscosity and improve the melt fluidity .
Lubricant inside and outside of the titanium dioxide  points only relatively speaking , there is no strict criteria for the classification . In a different polarity resins , internal and external lubricant may change .
Such as stearic alcohol, stearic acid amine, butyl stearate , and stearic acid monoglyceride the polar resin ( such as PVC and PA) made ​​, from the internal lubrication, but for non -polar resin ( such as PE
, PP) , the external lubrication effect is displayed . In contrast , polymer with polar resins such as paraffin poor , such as in polar
PVC is used as external lubricant , and the PE
, PP and other non-polar resin was internally lubricated
Agent. At different  processing  titanium dioxide temperatures , inside and outside will change the role of a lubricant such as stearic acid and stearyl alcohol are used in PVC calendering initially, as the processing temperature is low, and PVC
Compatibility is poor, mainly from outside the lubricating effect, when the temperature rises, increases compatibility with PVC , then transformed into an internal lubricant effect.

PVC lubricants - PVC type of lubricant

Common PVC lubricants main properties are as follows :
( 1 ) Calcium stearate :
White powder , melting point 148-155 ℃, non-toxic, have excellent lubricity and processability, no curing pollution , and basic lead salts and lead soap and use, to increase the   Methyl tin rate of gelation , the dosage is generally 0.1-0.4PHR.
( 2 ) oxidized polyethylene wax
White or light yellow powder or granules contain small amounts of oxidized polyethylene wax , although polar group , is still compatible with the PVC , but the lubricating high efficiency, can improve lubrication between the polymer and the metal , improving the extrusion efficiency, improve a colorant dispersion, gives a good product transparency and gloss . Dosage 0.1-0.5PHR.
( 3 ) Stearic acid
White or light yellow granules , mp 70-71 ℃. Evaporate slowly at 90-100 ℃ , the hard PVC processing as external lubricant , the dosage is generally 0.2-0.5PHR, and to prevent fouling of the chromatographic effect, but with excessive easy to spray cream.
( 4 ) Glyceryl stearate
Powder substance , melting point 85-87 ℃, with excellent heat resistance and mobility, increase the amount of filler , and may contribute to plastics . And waxes and use, can improve the titanium dioxide anatase  thermal stability of PVC-U . Dosage is 0.2-0.6PHR.
In practice, it was found that two or more lubricant when used in combination with the emergence of a different effect when used alone . In profile formulations, they use complex methods
( 5 ) Paraffin
Melting point 57-63 ℃, no polar group , is a typical external lubricant . Because of its low melting point, easy to evaporate , the melt viscosity is small and only in a narrow range of a lubricant , suitable for single or double screw extruder , the general amount of 0.1-0.8PHR. This product transparency is poor , easy to whiten.
( 6 ) Polyethylene wax
White powder , a softening point of about 100-117 ℃, due to its relatively large molecular weight , high melting point , low volatility and therefore at higher temperature and shear rate , but  pvc additive also shows a clear lubricating effect . For rigid PVC single , twin-screw extruder , the usual dose is 0.1-0.5PHR.

What are metal soaps waterproofing agent

Waterproofing agents of metal soaps soluble metal soaps (the soluble soap) waterproofing agent, and asphaltenes metallic soap waterproofing agent II
. Water soluble metal soaps agent is  Stearate zinc stearic acid, ammonia, potassium hydroxide (or soda) and water at a ratio of
Cases of mixed heating saponification prepared from a water repellent. This product is a colorless syrup, mixed in cement mortar or concrete
, Make the cement particles and aggregates formed between hydrophobic adsorption layer and the formation of insoluble matter, from the tiny pores and clogging wool filling
Thin tube pathway effect. Bituminous waterproofing agent is a metal soap liquid petroleum asphalt, lime and water, mixing, after drying mill
Fine together. Mixed with the calcium zinc stabilizer  cement mortar and concrete ... a pore size in the nanometer to millimeter. If the surface in contact with the aqueous solution,
Solution by capillary action will be adsorbed to the surface of concrete and further penetrate into the concrete; while in solution
Harmful substances such as chlorine ion, sulfate ion and the like can also be easily transported to the water inside the concrete, reinforced concrete results to
Structure serious corrosion damage. At present, domestic and foreign penetration has been widely used for waterproofing agent on the concrete surface
Waterproof treatment, but using the  iron oxide yellow traditional processing methods, waterproofing agent, penetration depth is very limited, in some special
Waterproof case the effect is not very satisfactory. If you can mortar or concrete waterproofing agent is used as a component incorporated therein,
Then the protection would be better, this approach is within the mixed water treatment. This paper mainly uses four different types, two
Different dosage of metal soap, add it to the concrete mix to compare, test and research within the mixed metal soap right
Concrete compressive strength, water absorption coefficient by capillarity, and anti-invasive ability of chloride ion.

Introduction fatty acid metal salt production process

 Fatty acid salt is closely related with people's lives, and its many types, such as fatty acid  Stearate zinc sodium salt (soap) is commonly used in detergents, fatty acids and divalent and trivalent metal salts generated by the use of products in the industry is very extensive. This paper describes the use of fatty acid alkaline earth metal salts, preparation principles and production technology for the utilization and development of oil companies oil fine chemical products reference. 1 fatty acid salt thereof, in addition to ammonium salts of fatty acids, potassium, sodium, almost all of the  epoxidized soybean oil carbon chain fatty acid metal salts are not soluble in water, very low solubility in polar solvents, in a non-polar solvent presented in the gel, only the mineral oil and grease can be dissolved. All fatty acid salts have different crystal forms. Melting point fatty acid salt is one of the important indicators of things, its melting point in the range of 1 8 ~ 2 66 ℃, with the fatty acid carbon chain length, degree of saturation and different types of salt and a larger difference. According to statistics, various fatty acid salts of calcium in the largest amount, about 60%, followed by zinc, accounting for about 20%, other about 20 percent of magnesium, lead salts, cadmium salts. The main purpose of fatty acid salts are: 1.1 for the polymer industry, such as carbon chain saturated fatty acid salts of caprylate in  antimony trioxide polymers is often used as a heat stabilizer, a curing agent and catalyst; carbon chain saturated fatty acid salts hydrocarbons such as stearic acid salts can be used as the polymer material mold release agents, stabilizers and lubricants, a variety of polyester desired fat ......

processing aids in different processing methods and the application features

Processing aids action principle: PVC melt poor scalability, easily lead to melt broken; PVC melt relaxation is slow, easily lead to the product surface rough, dull and shark skin and  antimony oxide so on. Therefore, PVC processing often necessary to add processing aids to improve the melt of the above-mentioned drawbacks. Processing aids as a class can improve the performance of resin processing aids, which consists of three main modes of action: promoting resin melt, the melt rheology modifiers and gives lubrication. 1 PVC resin promoting resin is melted when heated under shear force, processing modifier first melted and adhered to the surface of the PVC resin particles, based on their compatibility with the resin and the molecular weight, the viscosity of PVC and friction increases, thereby effectively the shear stress and heat transfer to the PVC resin, PVC accelerate melting. (2) has a melt rheology modified PVC melt strength is poor, poor scalability and melt fracture and other shortcomings, while processing modifier can improve the melt above problems. Its mechanism of action is: to increase the  azodicarbonamide melt viscoelasticity of PVC, thereby improving the die swell and increased melt strength. 3 gives lubricity compatibility with PVC processing modifier part first melting molten play a catalytic role; partly incompatible with PVC molten resin to migrate outside the system, thereby improving mold release. ACR processing aids commonly used species category, ACR is methyl methacrylate. ACR domestic products ACR-201, ACR-401 and other varieties. ACR-201 methyl methacrylate and acrylate graft copolymer, the appearance of a white powder, the PVC can be added to improve the melt strength and melt elongation. ACR-201 is mainly used for rigid PVC profiles, pipes, bottles and sheets, the amount of 0.5 to 2 parts. ACR-401, methyl methacrylate, ethyl acrylate, butyl acrylate and styrene monomer from four kinds, are core - shell copolymers, AMS class, AMS-based oligomeric α-methyl styrene material, which is also called hexamer M-80, it is non-toxic and transparency, and can improve the processability of PVC resistance and organic pigments  luster of products. AMS for rigid PVC, the hard tube add 2 to 5 parts, 3 parts of a transparent film, was added 10 parts of the floor. Copolymers of butadiene and acrylonitrile P83, the surface treatment by the PVC latex, can be used as processing aids, added in an amount up to about 20 parts. 820-G is a chlorinated paraffin and polypropylene oxide - ethylene made by free radical grafting, which can improve the processability of PVC, gloss and feel, added in an amount up to 5 to 10 parts.

PVC heat stabilizers thermal stabilizing effect of the conductivity measurement method

PVC heat stabilizer effect of thermal stability measuring method, also known as electrical conductivity potential method. Experimental apparatus composed of four main parts, an inert gas means the right, the general use of nitrogen, but sometimes the use of air, the  Metal stearate difference is that when using nitrogen protected, the oxygen in the air to avoid oxidation of PVC degradation arising parent chain. Experimental heating apparatus is generally of about 180 ℃ oil bath pot, inside the pot into the oil bath and with PVC heat stabilizer mixture, when HCl gas is generated, will be left with the inert gas into the NaOH solution in, NaOH rapidly absorbed HCl, resulting pH of the solution changes with time by recording the  Plastic impact modifier change in pH meter can determine the type of the effect of heat stabilizers. The experimental results, the process pH-t curve obtained into induction and growth period, the length of the induction period with the effect of heat stabilizer different merits. One-step co-precipitation method were synthesized containing stearate, dodecyl benzene sulfonate hydrotalcite.
(L) material: MgNO3, AINo3, NaoH, Naeo3, sodium lauryl sulfate, stearic acid
(2) reaction step: 1000ml beaker in a certain amount of deionized water while a solution concentration of 0.85mol / L, o.4mol / L of magnesium nitrate and aluminum nitrate solution, to which a certain amount of NaCO3 solution, adding NaOH solution to the PH value of the magnesium stearate  reaction solution was maintained at around 10, the synthesis temperature 45 ℃, sodium lauryl sulfate were added last, stearic acid, after precipitation of different synthetic hydrotalcite, after filtration, washing and drying, the final solution containing different hydrophobic anionic hydrotalcite.

PVC composite heat stabilizer

Stabilizers to an increased solution, gel, solid, chemical stability of the mixture. It can slow down the reaction, to maintain chemical balance, reduce surface tension and prevent light, thermal decomposition or oxidative decomposition effect. Generalized chemical stabilizers wide range of sources, mainly based formulation designed to organic pigments  designers, the flexibility to use any chemicals to achieve the purpose of product quality and stability. Narrowly speaking, mainly refers to maintaining high polymer plastics, rubber, synthetic fibers such as stability, to prevent its decomposition, the aging of the reagent. PVC sheet composite heat stabilizer is a compound of lead from the dust symbiotic (Co-reaction) reaction technology, to ensure thermal stability of the base element composition (such as two. Three salt, metal soaps) in the reaction system was in the beginning of the body Eco grain size and mixed with various lubricants to ensure the  potassium stearate product groups were thoroughly mixed uniformly PVC products widely used performance indicators:
1, at the processing temperature can improve the stability, effectively prevents a partial coking material.
2, compatibility with PVC and dispersion, and do not migrate, non-blooming, easy to be water, oil or solvent dissolution without grinding.
3, to improve the flow properties of PVC materials, to facilitate a smooth process, improve product yield, reduce processing machinery running wear.
4, not only the ability to learn a better defense, and electrical properties of products, high frequency welding, adhesion and second processing performance is also good.
5, various additives to reduce the potassium soap deposition surface in the processing machinery, product appearance and good quality.
6, reduce pollution, reduce labor intensity, inexpensive, easy to use.

Lead-based heat stabilizer and application

Heating and kneading under the  plastic flame retardant conditions of a synergistic effect of various lead salt stabilizer, heat stabilizer and external auxiliary lubricant fully
Mixed into granules or flakes of lead salt composite stabilizer products. Lead salt compound heat stabilizer application has advantages: 
The various components in the production process can be fully mixed with the resin mixed and dispersed greatly improved uniformity.  reasonably stable
Fixed dose selection and matching, to maximize the strengths of each component and the synergistic effect and increase product cost.  with efficient lubrication
Agent mix, has a wide range of processing, to increase applicability.  formulation mix, reducing the  PVC lubricants  measurement error, thereby reducing
Small losses.  simple supply and reserves of the  Metal soap materials is conducive to production and quality management.  clean production products,
Improved production conditions. Composite lead stabilizers trends:  functional, professional, personalized 
 low lead Pb-free lead salts to improve their performance