Polyvinyl WSD processing aid is one of five common plastic

Polyvinyl chloride (PVC) is one of five general-purpose plastics , its products have a wide range of uses. However , PVC thermal stability exists disadvantages must be added when a suitable heat processing stabilizer to inhibit thermal degradation. Heat stabilizers Metallic stearate commonly used in industry are mainly inorganic lead salts and organic tin, metallic soaps . However , one of the most common varieties are poisonous , which not only limits the scope of application of PVC products and harm to the environment and their use of labor health PVC products are produced with sustainable growth and rapid deepening. To protect the environment , improve the working conditions of health in recent years in Europe , America, Japan, and the country has been developed and implemented to limit the use of hazardous chemicals policies and regulations. Therefore , research and development at home and abroad are set off and promote the use of non-toxic substance heat stabilizers to replace traditional toxic varieties boom. Rare is the advantage of PVC plasticizer our resources , rare earth compounds as PVC heat stabilizer application has attracted wide attention . In principle , since the rare earth hydroxide with a weakly alkaline medium and can absorb HCl, and hence, a heat stabilizing effect PVC . But until now , although the literature involving alkaline earth metal hydroxide is calcium hydroxide as a particular application of PVC heat stabilizers , but no rare earth hydroxide is used as PVC heat stabilizers research reports . Recently , the experts for the development of cost-effective environmentally friendly zinc-based PVC heat stabilizers, inorganic compounds as application performance heat stabilizer for a more systematic study found that lanthanum hydroxide is an effective synergist heat stabilizers.

WSD plastic processing aid industry is currently technical level

According PvC plastics processing industry is currently technical level , although a variety of products , recipes using different households but still mixed metal stabilizer system based. In the past, products processing factories with one-component , single-species steady purchase Beng various additives, formulated his own mixed use , PVC stabilizer processing a variety of PVC products, now has developed into the stabilizer born less "factory according to user requirements , composite production, and can be . ne-paeks ( one package ) sold stabilizer products, deepen and broaden the technical support services , so varieties of PVC compound stabilizer designed for user needs , and many more special type of master such as liquid composite stabilizer , mainly for soft products ( films, leather , etc. ) : clean composite solid lead salt stabilizer , mainly used for rigid materials such as articles and cable : for a single machine and specialized product requirements design composite stabilizer ( such as ZFZ products dedicated to the sole material ) .Compatibility with the ratio of the composite stabilizer , based on long production experience , is still a variety of metal salts as Lord stabilizer, with its complex and adduct of synergy effect . Should , while accompanied by a variety of auxiliary stable agents, to further enhance the stabilizing effect of the metal PVC heat stabilizer salt system. In the design of the liquid component of a composite stabilizer , metal salts of the general control of the content of 2% -15 % ( of metal ion , the weight percentages ) phosphite, vinegar, 10% -50 % , 2% -10 % of antioxidant , light stabilizer 1% to 4% lubricant 1% -10 % 20% -40 % solvent . The solid composite stabilizer , generally available Pvc resin together with modified and processed cPE, EvA etc. ) as a carrier excipient , the control content of 10% -50 % metal salt ( metal ion count , percent by weight) , a lubricant 5% -15 % auxiliary stabilizer 5% -10 % .

some of the main principles of the processing aid for processing

1, the role of the principle of PVC processing aids melt due to poor scalability, easily lead to melt broken; PVC melt relaxation slow, easily lead to the product surface rough, dull and shark skin and so on. Therefore, processing often requires the addition of PVC processing aids to improve the melt processing aids described above is the lack of processing performance can be improved resin additives, and its main role in three ways: to promote the molten resin to improve the rheological properties of the melt lubrication and promote the molten resin to give: PVC resin in the WSD PVC flame retardant  heated state, when the shear force under certain melt processing modifier first melted and adhered to the surface of the PVC resin particles, its compatibility with the resin and Its molecular weight, the viscosity of PVC and increasing the friction, and thus the shear stress and the effective heat transfer to the PVC resin, melt rheology improving the acceleration performance of the molten PVC: PVC has a melt strength is poor, poor ductility, and melt fracture shortcomings, and to improve the melt processing of said modifier rheology. Its mechanism of action: Increase the PVC melt viscoelasticity, thus improving the die swell and melt strength gives improved lubricity: PVC processing modifier is compatible with the first portion of the melt, plays the role of promoting the melt; but not with PVC Compatible part WSD Polyethylene wax  migrate to the outside of the molten resin system, thereby improving the releasability of the copolymer 2, a conventional processing modifier ACR ACR methyl methacrylate and acrylate, and styrene monomers. In addition to be used as a processing aid, it can also be used as impact modifiers. PVC plastic window profiles or generally used ACR201 ACR401, in an amount of 1.5-3 parts of a modified impact modifier polymer content is important to improve the impact resistance, PVC resin is a non-polar high crystallinity there is a strong interaction between the oligomer molecule, is a hard and brittle material; low impact strength. After the addition of impact modifiers, elastomeric impact modifier particles can be raised to reduce the total stress crazing and  WSD zinc stearate its particle deformation and shear band and prevent crazing expansion and growth, absorb the impact of the transmission of the body material able to achieve the purpose of impact. Small particle modifier to facilitate increasing the number of unit weight or unit volume of a modifier to increase the effective volume fraction, thereby enhancing the ability of stress dispersion. Currently used widely for organic impact modifier.

There are many kinds of plastic processing aid methods

About plastic extrusion, injection molding, blow molding, rotational molding, casting, dip and other plastic molding process, depending on the specific choice of materials and products, the advantages and disadvantages of hard to say.
  Here I am with PE plastic processing methods simply lower, PE available a wide manufacturing different processing method. As the main raw material ethylene, propylene, 1 - butene, hexene copolymer, under the action of a catalyst, using a slurry polymerization or gas phase polymerization process, the polymer obtained by flash separation, drying, granulation, etc. processes, was
Uniform particles have finished. Including such sheet extrusion, film extrusion, pipe or profile extrusion, blow WSD Plastic impact modifier  molding, injection molding and rotational molding. Extrusion: grade for extrusion production generally has a melt index of less than 1 and the width to wide MWD. In the process, the availability of suitable MI low melt strength. Broader MWD is more suitable for extrusion grades, because they have a higher production speed, lower the die pressure and melt fracture reduction trend. There are many PE extrusion applications, such as wires, cables, hoses, tubes and profiles. Pipes for natural gas applications ranging from a small section of yellow tube to 48in diameter thick-walled clarinet for industrial and municipal pipes. Alternative to large diameter hollow wall  WSD zinc stearate made of concrete pipe used as rainwater drains and other sewer pipelines rapidly.
Sheet and thermoforming: Many large picnic-type freezer thermoforming lining is made of PE, with toughness, light weight and durability. Other sheet and thermoformed products include fenders, tank linings, disc bowl guard, transport boxes and cans. The rapid growth of a mass-sheet applications are mulch or bottom in the village, which is based MDPE with toughness, chemical resistance and impermeability. Blow: These range from equipment bleach, oil, detergent, milk and a bottle of distilled water into WSD PVC stabilizer  a large refrigerator, car fuel tank and the canister. Blow molding grade characteristic indicators, such as melt strength, ES-CR and toughness, and the sheet for thermoforming applications level
Similar, it can be used with similar grade.

Environmental plasticizer selection and performance and characteristics

Environmental plasticizer selection:
Different design requirements of PVC products use different nature plasticized system, and the ideal plasticizer should meet the following requirements. 1, high plasticizing effect, good compatibility, low volatility.
2, migration resistance is small, with time shift delay products, or other materials do not migrate to the surface of the contact.
3, and good resistance to extraction, contact with products like oil or aqueous solvent, a plasticizer does not spread to occur.
4, good low temperature performance, low temperature without losing its products in flexibility. 5, good insulation properties. 6, good mechanical properties 7, odorless, colorless, non-toxic 8, good flame retardant properties. 9, anti-fungal properties. 10, low WSD Metallic stearate  prices. Plasticizing effect really Maoyou, plastic corporate trust products. A, name: chloromethoxy fatty acid ester. Second, the formula: C20H37CI3, a molecular weight of 463 Third, technical indicators 1, Appearance: pale yellow oily liquid. 2, density (20C) :1.155-1 .175 3, Flash Point: (open) ≥ 170 ℃ -195 ℃. 4, heating loss (125C ± 1C.3h)% ≤ 0.4. Fourth, the performance and characteristics of the product is the company under the guidance of experts, after years of painstaking research the success of a new type of plasticizer, which is made from natural oils and alcohol transesterification reaction, then the reaction of a class of chlorinated has a high molecular weight, good compatibility with PVC, excellent WSD Aluminum hydroxide  plasticizing effect, fire resistant, non-toxic, environmentally friendly compound plasticizers. Since both the product ester structure, octyl dimethyl substitution o stupid butyrate as a plasticizer, while containing chlorine can be replaced by paraffin, improve flame retardancy and electrical insulation.
Fifth, products and applications: Environmental plasticizer compatibility with PVC resin than DOP, DOA, DBP, and can be widely used in environmental protection pvc products, such as leather, PVC cable, plastic film, plastic sandals, foam sandals, doors and windows  WSD Stabilizers for pipe and window seals, PVC profiles, soft board, all kinds of soft, hard pipe, decorative materials, rigid foam board and all use of plasticizer products, has a wide range of uses, and ultimately to achieve lower production costs purposes.

PVC heat stabilizers catalysis

PVC heat stabilizers catalyst. Such stabilizers include lead salts , organic acids, metal soaps , organic tin compounds , epoxy compounds , phenol salts and metal thiolate salt. They can react with HCL , inhibition PVC de HCL response.
2 ) replacement of PVC molecules suppress  Metallic stearate unstable allylic chlorine atoms off the PVC. Such as organic tin stabilizer of PVC unstable molecule ligand binding chlorine atoms in the ligand , a chlorine atom with an unstable organotin substitution . 3 ) the addition reaction of a polyene structure , a large conjugated system damage formation and reduce coloration . A salt of an unsaturated acid or ester containing double bonds , and the PVC molecules conjugated diene double bond addition reaction , thereby destroying the conjugated structure, and color.
4 ) to capture free radicals and prevent the oxidation reaction . Such as adding phenolic heat stabilizers can block off the HCL, is due to give phenol H atom radical degradation of PVC macromolecules with radical coupling reaction with O2 to form a substance can not be , and has a thermal stability. Such thermal stabilizers may have one or several functions of both .
Ideal PVC heat stabilizer should be a multi-functional substance , or a mixture of some materials , they can achieve the following functions: First, replacement lively, unstable substituent ; second is to absorb and neutralize the release of PVC during processing HCL, eliminating the autocatalytic degradation of the HCL ; third neutralization or passivation of the catalytic metal ions from the degradation and other harmful impurities ; Fourth, through the chemical reaction forms an unsaturated bond can block the  PVC processing aid continued growth inhibition degradation coloring ; five is the best protection against ultraviolet radiation shielding effect . Typically heat stabilizers according to their performance with the use of special , rare cases used alone , and most varieties are powdery , some are highly toxic chemicals. For ease of use , to prevent dust poisoning, reduce toxic substances or replaced by non-toxic substances, at home and abroad in recent years developed many kinds of composite stabilizer , for example , the world famous German brand composite stabilizer Bear series , the United States , Germany, Japan, Netherlands and other countries or organotin compound organotin stabilizers have considerable market share in China . Therefore , efforts to promote the application developed in China with high efficiency , low cost , no dust pollution and non-toxic or low toxicity of new composite stabilizer , is the urgent need for the development of the plastics industry .
Ideal thermal stabilizer should also absorb HCL, remove the active site , the addition of a conjugated polyene chain , destruction carbenium salts and prevent auto-oxidation , etc. , which does not produce a product of catalytic degradation of PVC . The actual heat stabilizers with different functions due to exhibit different thermal stability characteristics ,
1 ) cadmium , zinc soap is typical of aluminium stearate  early -type heat stabilizers , can quickly absorb HCL, and Cd, Zn in the catalyst to effectively replace PVC chain carboxylate unstable chlorine atom , thereby effectively suppressing the initial degradation and coloring , but because of consumption of fast transformation products CdC12, ZnC12, but also off the HCL PVC efficient catalysts , which will lead to degradation of the material PVC vicious suddenly darkened , so long-term thermal stability .
2 ) barium, calcium soap is a typical long-term thermal stabilizers, only the function of absorbing HCL , PVC can not effectively suppress coloration , but the transformation products BaC12, CaC12 non- catalytic activity , does not cause a sudden black PVC , long-term heat stability better.

properties of metal soap

SBS has a good high and low temperature performance and temperature performance , is currently the most widely used  dibasic lead phosphate at home and abroad range of modified bitumen varieties but , SBS and asphalt between the density, molecular weight , viscosity, polarity and solubility parameter difference compared to other properties large , high-temperature storage process prone to SBS and bitumen phase separation phenomenon , segregation test in order to achieve the requirements of product fluorescent brightener  standards modified asphalt is very difficult , this feature greatly limits its application [ 1 ] and therefore , the present study is one of the hot issues resolved SBS modified asphalt production and use in the presence of the main thermal storage stability problems. SongXiaoyan [ 2 ] et al showed that organic salts increases the viscosity of bitumen modified asphalt , Meanwhile modified , reducing the temperature sensitivity of asphalt , improved high temperature performance , low temperature performance of the asphalt little effect . Yang Jinquan [ 3 ] and other studies have shown that people , metallic soap, the lack of improvement in low temperature crack resistance , but can  PVC heat stabilizer for fittings enhance the high temperature stability of asphalt in this issue on the basis of previous studies , presented at the SBS modified asphalt adding metal soaps, prepared SBS / metallic soap compound modified bitumen studied SBS, metal soaps complex with its modified asphalt mixture performance is analyzed SBS / metallic soap compound modified asphalt macroscopic mechanical properties and microstructure morphology between

those who can improve the thermal stability of the polymer additives are known as heat stabilizers

Broadly speaking , those who can improve the thermal stability of the polymer additives are known as heat stabilizers. Because of the poor thermal stability of PVC , so most of the world are used for PVC stabilizer PVC . Therefore , the commonly used stabilizers for PVC means polyvinyl chloride and copolymers of heat stabilizers.
Generally in accordance  low molecular polyethylene with the chemical composition of a heat stabilizer to the classification can be as basic lead salt , a metal soap, organic tin , epoxy compounds, phosphorous esters, polyhydric alcohol. In terms of the role of size can be divided into the main stabilizers for PVC stabilizers and auxiliary stabilizers. Auxiliary stabilizing agent itself or only a small stabilizing effect without thermal stability , but it and the primary stabilizing agent and having a synergistic effect ; primary stabilizer is generally a metal-containing heat stabilizer. And epoxy compounds, phosphites , polyols and other pure compounds are generally used as an auxiliary stabilizer .
As to achieve good stability of PVC often need to use a variety of pvc heat stabilizer , so that some products is a combination of stabilizers for PVC component complex , a composite stabilizer , such as barium cadmium stabilizer, barium zinc stabilizer etc. , these composite stabilizer usually has joined the PVC processing lubricants and other additives needed to facilitate the users. Many varieties of composite stabilizer organic pigments  with powder, paste , liquid, three forms [ 1 ]
( 1 ) absorption of hydrogen chloride
Me (OOCR) 2 + 2HCl === MeCl2 + 2HOOCR
Wherein Me is : Pb, Ba, Cd, Ca, Zn, Sn, Sb, Mg, Sr , etc.
( 2 ) eliminate the instability of the chlorine atoms substituted or eliminate unstable chlorine atom.
( 3 ) to prevent the auto-oxidation of PVC in the  magnesium hydroxide flame retardant hot oxygen and shear stress , easily oxidized by O2 degradation .
( 4 ) metal salts of maleic acid, or to inhibit or eliminate the double bond becomes shorter and less .

plasticizer growth method

There are four main kinds: ① thermal mixing: the plasticizer with powdered synthetic resin (including other plastics additives) After mixing, mixer or mill and then at a certain temperature mastication.
② dry mixed: the  PVC heat stabilizer for window synthetic resin powder in plasticizer, at a temperature under stirring conditions, to obtain the appearance of a synthetic resin with no significant difference between the original dry blend powder.
③ Glue: the fine-particle synthetic resin of adequate shear blender mixed plasticizer, the formation of stable and pouring the paste or slurry (see plastisol processing).
④ as a solution: the  Glycerol monostearate synthetic resin is dissolved in a suitable solvent (or solvent mixture), and then mixed with a plasticizer to adjust solubility, i.e. a solution of synthetic resin plasticizer. Top 3 Ways need to be heated and stirred, the first four methods without heating.
Since a large amount of plasticizer, variety, plasticizer production technology tends to two aspects of development. On the one hand is the primary plasticizer continuous large-scale production; hand is a special plasticizers many varieties, small batch batch production.
With the increase of PVC production and petrochemical industry, has developed into a plasticizer to petrochemical-based, phthalate-based products, large-scale production chemical industry. Phthalate plasticizer production accounted for more than 80% for large-scale continuous production provided the conditions. Because many varieties, small batch plasticizer existence of the "universal" batch production plant that Acrylic processing aid  is necessary for the survival of its development still.
To reduce the product color, thermal stability and improve the product further simplify processes, non-acidic catalysts have been industrialized. Use of non-acidic catalysts are less side reaction, the product color light, simple and refined products, produce less waste water quality is good, good thermal stability, product yield advantages.

concrete surfaces enclosing class waterproofing agent

 Concrete surfaces enclosing class waterproofing agent is applied to the  concrete surface coated with a PVC stabilizer for cable  layer of a surface layer can penetrate into the pores of manipulation
Hydrophobic waterproof material, such as commonly used in China silicone waterproofing agent, silicate-containing water agent, and the foreign
Acrylic acid methyl ester monomer with waterproof Qi cracking and so on. 1 penetrate the surface of the Glycerol monostearate  closed water causes and mechanism of concrete seepage
Mainly due to external pressure, or because the pores of which the concrete surface adsorbed water, or because the two integrated
Cooperation with. Pore ​​water is due to the pores on the surface acting on the surface tension of water in the concrete grout
The driving force generated within the adsorbed water with the rules. Concrete interface between water and the aluminium hydroxide  contact angle of the meniscus is generally less than 90 degrees, the force
Could drive water into the pores which can wet surfaces. When using a certain way
(A) General coagulation on the surface of the twisted 90 ') Tian a contact angle (on concrete
Soil surface moist and pores filled with the composition of the soil water repellent reaction or because the chemical properties of the concrete itself
Soil pores (micropores, pores, etc.) and the water contact angle is increased to more than 90 degrees ...

PVC heat stabilizers commonly used in two test methods

PVC heat stabilizers torque rheometer test method
Mimic the actual torque rheometer PVC processing a typical small pilot-type apparatus. Outside of the PVC flame retardant  instrument a closed processing tank, connected to the instrument by the computer can control the machining tank temperature, and within two roll speed, torque rheometer added quality of materials is generally 60 ~ 80 g, depending on the apparatus and different models. Experimental steps of: preparing in advance with different thermal stabilizer masterbatch based on PVC masterbatch formulation, in addition to other ships and ACR, CPE, CaCO3, TiO2, lubricants and the like. Torque Rheometer advance the set temperature, when the egetable stearic acid  temperature rose to specify and steady speed, will be weighed mixture added processing chamber, quickly closed records on a computer connected to a variety of parameters, namely flow curve. After processing, you can also get different extrudate physical characteristics, such as whiteness, whether shaping, smoothness and so on. These parameters can determine the  aluminum hydroxide corresponding potential industrial heat stabilizers, heat stabilizers suitable shall have suitable torque and plasticizing time of the extrudate should be preferably molded and whiteness, surface smoothing. Torque rheometer in laboratory studies and between industrialized mass production to build a convenient bridge.
PVC heat stabilizers roll blackening test
Determination of thermal stability as a dynamic effect of a class of helper methods, dynamic two-roll used in the absence of the rheometer, the experiment instrument select double rolled sheet, which together with the high-speed mixed powder, compression molding, the resulting samples were subjected to extruded repeatedly until the black test piece until completely black record time, the time is called blackening. Blackening by comparing the length of time to determine the type of thermal stabilizer effect of the thermal stability of PVC.

Nano superfine powder flame retardant material

Flame retardants in polymer processing aids is one of the important, if the use of

nanotechnology polymer materials for fire-retardant treatment, flame resistance can be

achieved and self-interest. Currently, the majority of used inorganic flame retardants,

antimony-based flame retardant which include

, Aluminum-based flame retardants, phosphorus flame retardants and boron-based flame

retardants. As these flame retardants added to the polymer, causing the polymer processing

and product properties change, especially molded products, extruded products and film

products surface finish effects than

Large, so the need for all inorganic plastic flame retardant additive type ultrafine particle size.

Currently used as an additive flame retardant largest antimony trioxide, its particle size

and morphology on plastics and textile fabric properties and flame effect is very large.

Granularity trioxide

Important indicator of antimony pentoxide, antimony trioxide only when nanometer size only

when it is in itself has a large surface area, large permeability of the fabric, the

adhesion force, a strong washing fastness , flame-retardant effect is very obvious.
Superfine flame retardants can improve the mechanical properties, reducing the amount of

flame retardants to meet process requirements.
Nano-antimony trioxide flame retardant due to its small particle size has a special

ductility, the flame retardant properties than the micron antimony an order of magnitude

increase. It is particularly important because nanoscale particle diameter of less than

antimony direct chemical fibers

Trail, chemical fiber raw materials may be added to the masterbatch, so after spinning

uniformly distributed in the fiber fire-retardant materials, which makes the fiber itself

has a high flame retardancy.