PE modified polyethylene wax and paraffin

A small amount of low density polyethylene (LDPE) was added to the molten wax to form a homogeneous mixture of the polyethylene dissolved, and cooled to obtain a modified PE wax, paraffin wax which is very classic processing methods. Adding a small amount of polyethylene wax crystallization changed, so that the melting point paraffin has heat stabilizer for panel  been greatly improved, improved from 50 degrees to 80-90 degrees, LDPE also has very good toughness paraffin, wax coating containing the PE not easy to crack. Because of these advantages, several decades ago, PE is widely used in the modified paraffin wax coated paper, cardboard, waterproof packaging for food, when very expensive PE film can not be applied to these areas.
PE modified so that the physical properties of paraffin wax has greatly improved, but even the plastic coating applications, it is fundamentally different and polyethylene wax, not  stearic acid paraffin polyethylene + = polyethylene wax.
PE modified paraffin wax can change a small molecular weight (300-400) nature, at higher temperatures, large-volatile paraffin. Bake 180 degrees for 20 minutes, PE modified paraffin thermal weight loss of about 10 percent, a variety of polyethylene wax TGA basically about 0.5%. Modified PE wax used in powder coatings, baking smoke very serious.
PVC external lubricant wax can do, but there are many disadvantages: Since paraffin and small molecular weight PVC resin and incompatible, paraffin easily precipitate from PVC products, wax  Chlorinated paraffin tends to reduce the strength of PVC products. PE modified paraffin wax can not change these properties, but it improves the viscosity increase than pure wax such external lubrication has improved stability than pure wax.
For masterbatches, PE modified relatively pure paraffin wax, the viscosity increased, a shearing force increases, the relative genuine purpose polyethylene wax, PE wax or a modification of the pigment is difficult to effect uniform dispersion.

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 .

Effect on the performance of PVC heat stabilizers how much you know

A series of complex organic PVC heat stabilizers have begun to enter the market and gradually replaced the traditional heavy metal stabilizers.
PVC heat stabilizers are indispensable in the process additives , awareness of their concerns with human health and  iron oxide black the surrounding environment is gradually increased, the world has promulgated a series of measures to limit the use of heavy metal heat stabilizers .
Outside the industry generally believe that awareness of PVC heat stabilizers environmental protection has become an irreversible trend, in the process of environmental protection PVC heat stabilizer , research and development , non-toxic , non-polluting , complex , and efficient heat stabilizers have been more widely application .
PVC resin having a self- HCL released catalytic or structural instability polyolefin produced PVC resin capable of addition reflection to prevent or reduce the decomposition of PVC resin . General characteristics of the formulations selected thermal stabilizer , features and requirements of the article to be considered. Here are some characteristics of people stabilizer :
1 lead salt stabilizer is mainly used in hard articles . Lead salt stabilizer has good heat stabilizers , excellent electrical properties , low cost and so on. However, its toxicity, easily contaminated products , can only produce opaque products. In recent years, large  iron oxide yellow numbers of composite stabilizer , stabilizer dangerous single component has been replaced . Features composite stabilizer is a dedicated and strong, little pollution , the advantages of simple ingredients and processing enterprises . But because no uniform standard , so the difference between the various composite stabilizer great .
2 barium cadmium -based stabilizers is a better performance heat stabilizers . PVC plastic sheeting used in wider . Usually barium cadmium and zinc and organic phosphite antioxidants and use .
3 . Calcium zinc stabilizers can be used as non-toxic stabilizers used in food packaging and medical devices, pharmaceutical packaging , but its stability is relatively low education , calcium -based stabilizers large amount of poor transparency , easy to bloom . Calcium zinc stabilizers usually used polyols and antioxidants to improve its performance, the PVC heat stabilizer  country has recently been Ca-Zn composite stabilizer for rigid pipes appear.
4 good thermal properties of the organic tin-based stabilizers , are preferred species for the transparent rigid PVC products , particularly octyl tin packaging products become almost indispensable toxic stabilizers .

Look plasticizer industry how to deal with future market

The news is no doubt consumers "Gospel ." With the enhancement of environmental awareness around the world and focus on aspects of chemical hazards to human health , have introduced on phthalates , the most commonly used types of phosphate plasticizers restrictions regulations and technical standards . Our country is in Asia plasticizer production, consumer, plasticizer production capacity of about 300 million tons, production of about 1.5 million tons . Because many companies related to international trade regulations insufficient attention on the face of the titanium dioxide anatase  endless variety of new regulations by surprise, in children's toys , food packaging , consumer goods and medical plastic products such as foreign trade industry has been a huge hit. Despite a greater impact , but the introduction of various international industry regulations is to ensure that the risk of harmful plasticizers are reasonable control and gradually replaced. Although the new international regulations to establish a high technical barriers, but once beyond, domestic enterprises from both technical and market while promoting industrial upgrading plasticizer .
President of the China Plastics Processing Industry Association, Liao pointed out that China's plastics industry is still huge room for development, but we must increase investment in technological innovation , attention to the introduction and training of technical personnel , to strengthen cooperation with universities and research institutes , tracking and abroad the latest trends in technology development , there are efforts to develop proprietary products and technologies with independent intellectual property rights , improve the overall level of technology and independent innovation capability . The role of plasticizer to provide mankind with high quality plastic products is indispensable , but it brings security issues , environmental hazards , pose a new challenge to humanity . R & D use of safe, environmentally friendly plasticizer has become an urgent  pvc additive task development of the industry . Accelerate the elimination of toxic plasticizers and promote the development of new non-toxic plasticizer has become an inevitable trend. Therefore , domestic enterprises must constantly monitor plasticizer regulations related fields exporter latest updates , progress and adjustments and changes , early good response. Second, to increase the new " non-toxic type", environmentally friendly plasticizer research and development efforts , the right to judge the market demand, timely adjustment of the production structure . It is reported that China plasticizer industry after decades of development, the industrial base has a considerable scale . Faced with new international regulations change constantly adjust product structure , more carbon black powder  advanced means of detection , evaluation method is more reasonable , a number of manufacturers have begun to catalyze a great effort under the new study , the separation process , vigorously develop and promote non-toxic , environmentally friendly and biodegradable growth plasticizers, the more cost-effective , more reliable security , a new generation of environmentally friendly plasticizer products to market.

All kinds of heat stabilizer heat discoloration Comment

Thermal stabilizers should preferably absorb both HCL, to eliminate the active site , the addition of a conjugated polyene chain , carbenium salt damage , etc. to prevent auto-oxidation , which does not produce the product of the catalytic degradation of PVC . The actual heat stabilizers have different functions due to exhibit different thermal stability characteristics , can be divided into early -type , long-term , intermediate -and versatile four . A ) cadmium , zinc soap is typical  Processing aid of early -type heat stabilizers , can quickly absorb HCL, and effectively substituted with carboxylate PVC unstable chlorine atom in the catalytic chain Cd, Zn , thereby effectively suppressing early degradation and coloring , but because of the consumption of fast and transformation products CdC12, ZnC12, but also off the HCL efficient catalyst PVC , PVC and thus lead to Chrolinated polyethylene  the degradation of the material suddenly vicious black , so poor long-term thermal stability. 2 ) barium, calcium soaps are typically long-term thermal stabilizers , absorption HCL function only and therefore can not inhibit coloring PVC , but the conversion product BaC12, CaC12 do not have catalytic activity , does not cause a sudden black PVC , long-term heat stability better. 3 ) fatty acids, organic tin are intermediate , both absorption HCL, can effectively replace with carboxylate unstable chlorine atoms PVC chain, and transformation products do not have catalytic activity.
 4 ) mercaptan organotin it Azodicarbonamide  has versatile features , while a variety of mechanisms can stabilize PVC, transformation products do not have catalytic activity , and therefore both excellent initial and long-term thermal stability effect.

plastic lubricant some differences

Lubricant is a broad concept. According to their different functions, the lubricant for the following three categories: (1) to reduce the friction between the particles to improve the powder flowability of the materials, also known as glidants glidants); (2) to prevent the fluorescent brightener  adhesion of raw materials to punch surface of the material, also known as anti-adhesion agent antiadherents); (3) to reduce the particle or tablet) with the friction between the die hole wall accessories, this is the real sense of the lubricant. An ideal lubricant should be both of the flow aid, anti-sticking and lubrication three roles, the lubricant in the currently available yet no such ideal lubricant, are often one or two aspects of a relatively good performance, but other effects are relatively poor.
Type of dispersant
Fatty acids, fatty amides, and esters
Stearamide and used with higher alcohol can improve lubricity and thermal stability, the amount (mass fraction) 0.3% -0.8%, the slip agent may be polyolefin; hexenyl bis hard fat acid amides, also known as ethylene bis-stearamide (EBS), the lubricant is a high melting point, the amount of 0.5% to 2%; glyceryl monostearate (GMS), glyceryl tristearate (HTG); oleic acid 0.2% to 0.5% of the amount; hydrocarbon wax solid, mp 57 ~ 70 ℃, insoluble in water, soluble in an organic solvent, the resin dispersibility, compatibility, heat stability are poor, the dosage is generally 0.5% or less
Paraffin
Although the wax is external lubricant, but straight-chain non-polar hydrocarbon, not wet the metal surface, such as polyvinyl chloride resin that does not prevent adhesion of metal walls, only, and stearic acid, calcium stearate and used, in order to achieve synergy
(Nujol): Freezing Point -15 ¯ -35 ℃, the extrusion and injection molding processing, the poor compatibility with the resin, add the amount is generally 0.3% to 0.5%, too much time, but the processing performance bad Microcrystalline wax: obtained from petroleum refining process, the  PVC profile stabilizer larger molecular weight, and has many isomers, mp 65-90 ℃, lubricity and thermal stability, but poor dispersion, the dosage is generally 0.1% -0.2%, preferably butyl stearate, higher fatty acids, metal soaps with
Metal salts of higher fatty acids, called metal soaps such as barium stearate (BaSt) for a variety of plastics, an amount of about 0.5%; zinc stearate (ZnSt) for polyolefins, ABS, etc., the amount of was 0.3%; calcium stearate (CaSt) suitable for GE Plastics, external lubrication, the amount of 0.2% ¯ 1.5%; Other stearic acid soaps such as cadmium stearate (CdSt), stearic acid Magnesium (MgSt), copper stearate (CuSt) low molecular weight waxes
Based on a variety of low molecular aluminum hydroxide  weight polyethylene wax (homopolymer or copolymer), polypropylene, polystyrene or other polymer modified as raw material, by pyrolysis, oxidation from a range of performance of different oligomers Its main products are: homopolymer, oxidized homopolymer, ethylene - acrylic acid copolymer, ethylene - vinyl acetate copolymer, low molecular weight ionomers five categories. Among the most commonly used polyethylene wax
Commonly used polyethylene wax average relative molecular mass of 1500-4000, the softening point of 102 ℃; Other specifications of polyethylene wax average relative molecular mass of 10,000 to 20,000, a softening point of 106 ℃; oxidized polyethylene wax of long-chain molecules with a certain amount of ester group or a soap, and thus the PVC, PE, PP, ABS and external lubrication more balanced, better, its transparency is good. As dispersing agent and its environment, many practical applications, selection of the appropriate dispersing agent is very important.

some description depolymerization pigment

In the dispersion process, only the surface of the secondary particles is not enough to wet paints, because such a large size, small surface area of ​​the pigment particles forming group can not meet the requirements of paints and maintaining a stable dispersion state of liquid paint .
Must therefore be subjected to  PVC heat stabilizer external mechanical forces (shear forces primarily) deaggregation these large particles, to restore back to the original level at or near the particle size to small particles form a large surface area exposed to the paint and so that all surfaces are exposed by wet paints.
This means the applied mechanical force, the pigment agglomerates and aggregates restored or nearly restored to the original level of particles or depolymerization process called dispersion process called.
Pigment in the paint in the paint manufacturing process depolymerization is the main, the most energy consuming processes. Make pigment depolymerization external mechanical force, usually by grinding and dispersion we normally use equipment, such as a sand mill, ball mill, three-roll machine, high speed disperser and two roll machine generated.
As a dispersion medium in order to create a liquid vehicle for the pigment (filling) material particles penetrate the surface of the conditions necessary to color (fill) material aggregates and agglomerates can be applied to promote its breakdown external mechanical force, the color (fill) depolymerization material particles, it is better to paint the wetting liquid, which requires grinding and dispersion equipment.
Paint the polishing slurry, the pigment particles depolymerization process, not only can be sufficiently liquid so that wet paint color (fill) material particle surface to improve the stability of the millbase, and with a higher level of pigment dispersion, coloring pigments, cover will be a corresponding increase in strength, gloss and other paint film performance is also improved. So the selection of an efficient grinding and  aluminum stearate dispersion device, can greatly improve the dispersion of pigment in the paint level, thereby improving the millbase while reducing the amount of pigment stability, improve the quality of paint and coatings.
3, stabilization:
Depolymerization has been wetted pigment particles distributed to a large number of paints continue to go, so there is enough paint coated on the periphery of pigment particles, and isolated from one another, thereby reducing the attractive force between the pigment particles, to avoid the mutual contact between the pigment particles, such that each has to be gathered and the solution of the pigment particles are moistened sufficiently thick, continuous, non-volatile dispersion of film-forming material is permanently open, the dispersion applied in the absence of under the control of mechanical forces, the pigment particles will not appear again coalesce into large particles in the process, called the stabilization process, to obtain stability of the pigment dispersion, the purpose is production of the final paint.
Thus, the dispersion of pigment in the  paint is wet, and stabilization depolymerization process three major components.
But, in fact, these three processes are not  calcium zinc stabilizer completely separate, but simultaneous and alternating conducted. For dispersing the pigment in the paint dispersion is formed, the relationship between the three: a wet basis, in order to more fully depolymerization wetting, and to achieve steady state of the ultimate goal.
If the pigment is dispersed in the paint well, to reach a relatively stable state, then had been dispersed pigment particles likely will re-close and gathered into large particles, forming what we call a pigment floc flocculation of pigments is distributed among the inverse process.
Floc pigments and aggregates and agglomerates, although the original-sized particles made of large particle coalescence particle group, but the floc and the latter are essentially different, although it still paints the surface of the package cover, paint particles have been filled the gap, the pigment aggregates and agglomerates the surface of the cladding is air and water, the gap is filled by air, but the micro-flocculation state, in the production of coatings as well as its the use of the Department.