Processing aid of the role and development

Processing aid is a play a supporting role in the matter, generally have filter aid, clarification, adsorption, lubrication, stripping, bleaching, peeling, solvent extraction, fermentation with nutrients like. Processing aid in the development and application process, according to the product ingredients be divided into the following broad categories: methyl methacrylate acrylate copolymer, styrene copolymer, acrylonitrile / styrene, etc., currently used the largest, the best is acrylate copolymer. PVC processing aid is a very special thermoplastic resin processing its pure Processing aid , poor mobility, low impact strength, poor weather, and therefore need to add all kinds of supplementary material in the process to improve its performance. Such as: lubricants, heat stabilizers, impact modifiers, processing aids and the like. With the development of PVC industry, especially plastic profile and the rapid development of plastic pipe industry, the demand for processing aid is also growing rapidly. Processing aid primary role is: to Processing aid
  the process of PVC plastics, improving the rheological properties of the thermoplastic melt, improve the mechanical properties of the melt under the heat elastic state. Integrated functions such as improving the appearance of quality products. Although the addition amount of the processing aid, but the processing performance is improved PVC is very important. Although domestic product has certain geographic and price advantage in the market competition, but compared with foreign products have a certain gap in our product performance, variety, stability, etc., which is our product formulation, processing technology (such as automation control and continuity of production control), processing equipment, and related post-processing technology behind. To this end a number of enterprises in the industry is fully aware of these problems, have established partnerships with research institutions, the establishment of research institutions to carry out research on plastic additives.

Introduction and role of the principle of processing aid

PVC is a very special thermoplastic resin processing its pure decomposition, poor mobility, low impact strength, poor weather, and therefore need to add all kinds of supplementary material in the process to improve its performance. Such as: lubricants, heat stabilizers, impact modifiers, processing aids and the like. Processing aids in the development and application process, according to the product ingredients be plastic processing aid  into the following broad categories: methyl methacrylate acrylate copolymer, styrene copolymer, acrylonitrile styrene, at present use the largest, the best is acrylate copolymer. The main role of processing aids are: to accelerate the process of PVC plastics. Improve the rheological properties of thermoplastic melt. Improve the mechanical properties of melt under the heat elastic state. Integrated functions such as improving the appearance of Processing aid  products. Although the addition amount of the processing aid, but the processing performance is improved PVC is very important. Role of the principle of processing aids: PVC melt due to poor ductility, easily lead to melt broken; PVC melt relaxation slow, easily lead to the product surface rough, dull and shark skin and so on. Therefore, it often requires the addition of PVC processing when processing aids to improve its melt these defects. Processing aids to improve the performance of resin processing aids, and its main role in three ways: to promote the molten resin to improve the rheological properties of melt and give the lubrication function.

Introduction and main role of plastic processing aid

plastic processing aid is a substance play a supporting role, generally have a filter aid, clarification, adsorption, lubrication, stripping, bleaching, peeling, solvent extraction, fermentation with nutrients like. Some for food, some used in manufacturing, and so on. PVC Processing aid  a very special thermoplastic resin processing its pure decomposition, poor mobility, low impact strength, poor weather, and therefore need to add all kinds of supplementary material in the process to improve its performance. plastic processing aid according to the different Processing aid  weight, there are different functions. The main role of plastic processing aid are: to accelerate the process of PVC plastics; improve the rheological properties of the thermoplastic melt; improve the mechanical properties of the melt under the heat elastic state; despite add less plastic processing aid, but to improve the processing performance but PVC is very important. Pure PVC impact due to poor performance, particularly low-temperature impact performance is poor, poor weather, the application is limited in many areas. Therefore, the need to improve the impact modifier added to its toughness and weatherability.

PVC processing aid Introduction

PVC is a very special thermoplastic resin processing its pure decomposition, poor mobility, low impact strength, poor weather, and therefore need to add all kinds of supplementary material in the Processing aid to improve its performance. With the rapid growth of PVC products, PVC processing aid has been widely used. The main role of PVC processing aid are: to accelerate the process of PVC plastics. Improve the rheological properties of thermoplastic melt. Improve the mechanical properties of melt under the heat elastic state. Integrated functions such as improving the appearance of quality plastic processing aid . Although the addition of a small amount of the PVC processing aid, but the performance is to improve the processing of PVC is very important due to the difference between the pure PVC impact properties, in particular poor low temperature impact properties, weather resistance is poor, the application is limited in many areas. Therefore, the need to improve the impact modifier added to its toughness and weatherability.

WSD plastic processing aid Introduction

  Processing aid  is a substance play a supporting role, typically having filter aid, clarification, adsorption, lubrication, stripping, bleaching, peeling, extraction solvent, with a fermentation nutrient and the like. Some for food, some used in manufacturing, and so on. PVC is a very special thermoplastic resin plastic processing aid  its pure decomposition, poor mobility, low impact strength, poor weather, and therefore need to add all kinds of supplementary material in the process to improve its performance. Lubricants, heat stabilizers, impact modifiers, processing aids and the like. Depending on the processing aid molecular weight, there are different functions.
  The main role of processing aids are: 1) to accelerate the Processing aid  of PVC plastics. 2) improve the rheological properties of the thermoplastic melt. 3) improve the mechanical properties of the melt under the heat elastic state. 4) improve the appearance of the quality of the products and other integrated functions. Although the addition amount of the processing aid, but the Processing aid  performance is improved PVC is very important. According to the function of the different processing aids can be divided into flux, melt rheology modifiers, lubricants and dispersing accelerator. In fact, each type of processing aids also have more than one effect. Any functionality and application results of a processing aid should depend on its chemical composition, the polymer structure, molecular weight and type of polymer matrix.

WSD plastic processing aid,PVC processing aid, processing aid: The practical application of PVC processing aid

WSD plastic processing aid,PVC processing aid, processing aid: The practical application of PVC processing aid: PVC processing aid  with flame retardant ,  chemical resistance  ( resistance to  high concentrated hydrochloric acid ,  sulfuric acid  conc...

The practical application of PVC processing aid

PVC processing aid with flame retardant, chemical resistance (resistance to highconcentrated hydrochloric acid, sulfuric acid concentration, concentration of nitric acidand the concentration of sodium hydroxide), PVC processing aid machinery has the advantages of good strength and electric insulation. Impact modifier, poor thermalstability. Impact modifier in the case of no heating stabilizer, PVC processing aid thatbegins to decompose, the faster decomposition. PVC processing aid of thermal decomposition of a release of hydrogen chloride gas, make its color from white to pale yellow, red, brown, black, impact modifier and oxygen will make the PVC photo oxidative decomposition, so that the flexible PVC last fall, crisp. PVC processing aidfrom here is not difficult to understand, why some PVC plastic over time will turn yellow, brittle. heat stabilizer for pipe Word sense disambiguation plastics processing aids discrimination hasstable physical and chemical properties, insoluble in water, ethanol, gasoline additivesprocessing aids, gas, water vapor permeability and low processing aids; calcium zinc stabilizer at room temperature for any concentration of hydrochloric acid, sulfuric acid,the PVC processing aid under chemical corrosion resistance, has a certain; for salt is quite stable, but can be dissolved in ether, ketone, chlorinated aliphatic hydrocarbons and aromatic hydrocarbons and other organic solvents.

WSD plastic processing aid,PVC processing aid, processing aid: Application of processing aid

WSD plastic processing aid,PVC processing aid, processing aid: Application of processing aid: Processing aids  can be completely  self curing ,  but  commercially available  processing aids ,  for  quality and stability ,  and  the ci...

Application of processing aid

Processing aids can be completely self curing, but commercially available processing aids, for quality and stability, and the circulation of commodities of processing aidsmust add stabilizer, not only all the processing agent I met will add thickening agent, if you can get the solidification type strains, PVC processing aid conditions can try look,do a good job, with a processing aid and have a look what stabilizer state, you know,why should add stabilizer. The effect of stabilizer of stearic acid metal salt thickeningand stabilization of protein is additive has the functions of a kind used in manyproducts, can bring many benefits for polymer products. We can use plastic processing additives word sense disambiguation is mainly divided into threeMetallic stearate aspects:in polyolefin acid neutralizing a group of pipe heat stabilizers on polyolefin colorstability and contribute directly corrosion; lubrication / processing aids to improve thepolyolefin, PVC profile stabilizer, plastic, plastic additives, polyamide, styrene and rubber in the extrusion film, fiber, copying and pressing molding processability. PVC profile stabilizer andCalcium zinc stabilizer for plastic, rubber and thermosetting products, such as polyurethane foamand unsaturated polyester.

The practical application of metallic stearates and PVC stabilizers

Metal stearates and PVC stabilizers are relatively common lubricants, metal salts of stearic acid and stearate in the melt between the wall surface and the metal thin film is formed, thereby providing lubrication role, but the stearic acid, metal salts of stearic acid salts are typically alkaline,WSD plastic processing aid,PVC processi it is to be appropriately selected depending on the type of plastic, the polyethylene wax is a polyolefin.WSD plastic processing aid,PVC processi lactose dryer Features : metal stearates fast drying, greatly increasing the surface area of ​​the atomized liquid, PVC stabilizer in the hot gas stream instantaneously 95% -98% of water evaporation, drying time is only a few seconds to complete bell, especially suitable for drying heat-sensitive materials. Metallic stearate products with good uniformity, mobility and solubility,WSD plastic processing aid,PVC processi high purity and good quality. Production process is simplified, easy to operate controls. PVC stabilizers and metal stearate to 40-60% moisture content (up to 90% special materials) can be a liquid product was dried to a powder after drying without crushing metal stearates and screening, reducing production process, improve product purity. PVC stabilizers product particle size, bulk density, water,WSD plastic processing aid,PVC processi within a certain range can be adjusted by changing the operating conditions, easy to control and manage. Working principle: PVC stabilizer heated air through the filter and into the top of the dryer hot air distributor,WSD plastic processing aid,PVC processi and then into the drying chamber was evenly spiral. Feed speed centrifugal atomizer at the top of the tower through the liquid, metal stearates rotation into a very fine spray mist droplets, PVC stabilizers in contact with the hot air flow in a very short drying time is finished, PVC continuous output stabilizer finished bottom of the drying tower and cyclones, exhaust gas from the turbine emptying.

WSD plastic processing plastic products introduced in the role

      WSD plastic processing in plastic products proportional share of less than 8%, but its role in the improvement and progress of plastics processing and application performance of it is unquestioned, now an array of plastic products almost invariably reflects the plastics additives function and role. Them with resin, processing machinery, Glycrin monostearate together constitute the three basic elements calcium stearate of the world's plastics industry.

      WSD plastic processing categories and numerous different functions. Depending on the function and role, often including stabilizing additives, processing aids and functional system gives agents the three systems. With the increased development of the plastic industry, plastic resin structure, advancement and application of technical advances in molding product performance requirements, which greatly promoted the expansion of categories of plastic additives consumption and production progress.

       WSD plastic processing can be divided into "synthetic additives" and "processing aids" two systems. Synthetic additives is defined by the monomers involved in the polymeric resin during various auxiliary chemicals, such as polymerization, initiator, molecular weight modifier, the terminating agent, emulsifier,PVC heat stabilizer for window dispersing agentand antifouling agent. They are intended to improve the conditions  of the polymerization, to adjust the size and distribution of molecular weight, is closely related to the polymerization process, the polymer resin and is generally not into the plastic article, the return on such additives customary in the discussion of the synthesis resin, and statistical category is not listed as plastic additives. The basic concept in the frame of modern plastics additives given in terms of processing aids.

       Is well known, WSD plastic processing molding process with the article consists essentially of, mastication, shaping processes to complete. In this process, resin, additives, processing equipment (including mold) is an integral part of the basic elements. In contrast, the additive in plastics formulations insignificant,magnesium hydroxide flame retardant but its role in the improvement and advancement of product processing and application performance on important. We can say that after the polymer resin structure determination, selection and application of additives products is the key to the success of the decision.

Some special effects WSD plastic processing aid in

Since the introduction of highly polar side groups on the main chain of the non-polar molecules , maleic anhydride -grafted polypropylene material can become polar and non -polar promotional material adhesion and compatibility bridge. Add a maleic anhydride grafted polypropylene in the production of filled polypropylene , can greatly improve the affinity and polypropylene filler and filler dispersion. It can PVC lubricant  effectively enhance the dispersion of the filler in polypropylene , plastic processing aid to improve the tensile and impact strength of filled polypropylene. Typical applications include maleic anhydride -grafted polypropylene : inorganic reinforcing material ( glass fiber ) and filler material ( calcium carbonate, talc , etc. ) and polypropylene coupling between the  PVC stabilizer polypropylene / nylon alloy silicone compatibility agent potting is a two-component room temperature curing silicone encapsulants condensed materials . It has : 1, compared with one-component sealant , overall faster curing , plastic processing aid can be encapsulated electronic module and the larger objects ( depths greater than 7mm) 2, compared with the two-component molding plus lower cost . 3, compared with epoxy resin , with excellent resistance to high temperature , anti-aging and anti- ultraviolet function. Potting Impact modifier  electronic modules , LED display , the pixels, backlight, and other electronic components : Typical uses. Improvement of polypropylene with a polar material ( metal , nylon, etc. ) adhesion. Appearance: yellowish, free-flowing particles .

influence of plastic processing aid materials

Although the material is very common plastics processing generally, but supplies are essential in our lives. The growth rate of
China's plastics processing industry is extremely fast, especially closer to modernization today. Plastics processing industry in a
very rapid rapid development. Now a lot of WSD plastic additive  material wood and metal has its drawbacks and limitations, they produce slow, costly,
and now a lot of weight disadvantages such as wood and iron products and parts have been replaced by plastic products, such as we
often see articles toothbrushes, nozzles, cups, sandals, etc. are made of plastic. It can be said almost unlimited capacity to
replace plastic.
As you know, a lot of things have plastic processing aid expansion and contraction characteristics, when something temperature
increases his larger expansion of the molecular structure, its outward expansion of larger organizations, we will let him certain
items heating swelling larger and be recorded, and then cooled to let him reduce some objects and records can be larger expansion
gap between the two objects in and out of the objects referred to as shrinkage. Plastic is so objects. According to the water-
absorbent plastics material is divided into two types of processing is divided into two types: the first one is the comparative
water-absorbing plastic, the second is  WSD plastic processing aid non-absorbent plastics. Plastic is easy to absorb water must be pre-processed was dry,
plastic processing aid for wastewater treatment, if the problem does not occur in the processing of the processing, the processing
time since the evaporation of water causes foaming of plastic, the payment of the low viscosity, resulting in forming Poor quality
of plastic products, so that the plastic has a significant influence on the drainage of molded plastic. If done in a plastic air
drying time is too long, it may absorb water again, be the result of water discharge through the plastic work. So those plastic
drainage has been done drying process must protect their drying plastics processing in accordance with WSD Titanium dioxide rutile  the chemical composition of
the material can be divided into: thermoplastics and thermosetting plastics. In order to distinguish the specific purpose, there
are many branches of two plastic names they use are different performance, thermoplastic polyvinyl chloride plastic, polycarbonate
cool, two questions need to plastic molding is not completely the same, in front of a species of mold is to first heat, followed by
cooling the mold you need. So be sure to have on the performance of plastic-depth understanding.

plastic processing aid described in detail

Propylene can become non-polar and polar materials to enhance adhesion and material compatibility bridge. Add a maleic anhydride
grafted polypropylene in the production of filled polypropylene, can greatly improve the affinity and polypropylene filler and
filler dispersion. It can effectively enhance the PVC flame retardant  dispersion of the filler in polypropylene to improve the tensile and impact
strength of filled polypropylene. Typical applications include maleic anhydride-grafted polypropylene: plastic processing aid
compatible inorganic reinforcing material (glass fiber) and filler material (calcium carbonate, talc, etc.) and polypropylene
coupling between the polypropylene / nylon alloys improving agent of polypropylene with a polar material (metal, nylon, etc.)
adhesion. HR tear the rubber resin added can  Polyethylene wax significantly increase the hardness of the rubber, aging resistance, abrasion
resistance, tear strength, tensile strength, and kneaded with an easy processing, easy and good coloring thermoplastic,
electrically insulating properties. It includes: 1, compared with one-component sealant, plastic processing aid faster overall
curing, the electronic module can be encapsulated and the stearic acid larger objects (depth greater than 7mm) 2, compared with the bicomponent
lower cost. 3, compared with epoxy resin, with excellent resistance to high temperature, anti-aging and anti-ultraviolet function.
Potting electronic modules, LED display, the pixels, backlight, and other electronic components: Typical uses.

a type of plastic processing aid analysis

plastic processing aid according to different molecular weight, and have different functions. Processing aid ACR 50-150 10,000 molecular weight processing aids are widely used for general article PVC flame retardant  having a core - shell structure of the elastic polymer, the core-shell impact modifier emulsion was ACR production technology core. In the continuous research and development of the global impact modifier ACR, the foreign ACR impact modifier has been enhanced on the basis of the traditional techniques, particularly aspects of particle size control and continuous production. China's major manufacturers early ACR impact modifier produced using seed method, batch aluminium stearate  emulsion polymerization production processes and devices equipped with a small, poor performance and product quality control fluctuations, impact product performance and greater foreign gap, the same low productivity, small batches. plastic processing aid development and testing of a large number of companies to achieve a one-step control of latex particle size, and to achieve low-temperature continuous emulsion polymerization process, greatly improving the efficiency of production, production plant expansion  Aluminum hydroxide through. In terms of the production process recipe uses a third, fourth functional monomers such as acrylic rubber performance in terms of both the impact and tensile greatly improved product performance reached the international advanced level.

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 % .

Ideal for PVC heat WSD plastic processing aidstabilizers should be a versatile substance

Ideal for PVC heat stabilizers should be a versatile substance , or a mixture of some of the material, they are able to perform the following functions : First, replacement lively, unstable substituents ; second is to absorb and neutralize the release of PVC processing HCL, eliminating plastic additive autocatalytic degradation of HCL ; Third neutralize or inactivate catalytic degradation of metal ions and other harmful impurities ; Fourth, through various forms of chemical reactions can be blocked unsaturated bond continues to grow , inhibiting degradation coloring ; five is the best shield against ultraviolet protective effect . Generally, heat stabilizers according to their performance with the use of special , very little is used alone , but most of the species in a powder form , some of which are highly toxic chemicals. For ease of use , to prevent dust poisoning, reduce toxic substances or substitute non-toxic substances, at home and abroad in recent years developed a wide variety PVC plasticizerof 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 a considerable market in China . Therefore , the development of China's efforts to promote the use of high efficiency, low cost , no dust pollution and toxic or low toxicity of new composite stabilizer is an urgent need for the development of China's plastics industry .

the mutual solubility of the mixed resin and plastic processing aid in

 Auxiliary plasticizer; inserted only partially crystalline molecular plasticizer amorphous regions of the polymer, the plasticizer, the plasticizer is also called non-solvent. Compatibility: the ability to dissolve the plasticizer and resin mixed with each other, and is one of the most basic requirements of plasticizer. Cohesive energy density (CED): energy per unit volume of solvent evaporation. Solubility parameters: the square root of the value of the energy of vaporization per unit volume of solvent. Cloud point (Tc): dilute homogeneous polymer solution and a plasticizer, at a temperature becomes cloudy during cooling. By measuring the cloud point can be estimated plasticizer and resin compatibility. The lower the cloud point, a plasticizer compatible with the polymer, the better. Plasticizing efficiency; plasticizing efficiency of the resin reaches a certain degree of softness is called the amount of plasticizer plasticizer. Plasticizing efficiency is a relative value, the plasticizer can be used to compare the plasticizing effect. The method used for representing plasticizing efficiency glass transition temperature (Tg) and reduce the decrease in modulus is represented. Oxidation of the polymer is the time increases with the decrease of the performance of the polymer, also known as auto-oxidation. Into the induction period, a strong oxidizing period. Antioxidants; refers to polymers by oxidation and slow the aging phenomenon can play the role of a class of chemicals. Primary antioxidant; antioxidant is considered to be the main cleaning agent, a free radical, it is through the coupling reaction (i.e., the termination reaction) to give a hydrogen atom or to prevent the damaging effects of free radicals in the polymer. Secondary antioxidants; role of antioxidants is to help decompose the peroxide oxidation of the resulting polymer. Antioxidants including an aid phosphite 2, 3 thioether antioxidants, metal deactivators metal ion deactivators; preventing the heavy metal ion induced oxidation of the resulting polymer material, often referred to as metal ions blunt agent or a metal deactivator, a metal chelating agent, also known as copper inhibitors. Stabilizer: to prevent or retard the polymer during processing, storage and use of chemical aging deterioration. Thermal stabilizers; mainly for PVC and other chlorine-containing polymers, which will not affect the processing and application, but also a certain degree of thermal decomposition of delaying the action of a class of additives. Light stabilizers; Where can inhibit or slow down the aging of optical oxygen substance called ultraviolet light stabilizer or stabilizers. Radical scavengers: a class of piperidine derivatives light stabilizer with steric effects, referred to as hindered amine WSD zinc stearate  light stabilizer (HALS) - aging or photoaging: molecular material long-term or short-term exposure to the sun set under strong fluorescence, due to absorption of UV energy, causing auto-oxidation reaction, leading to degradation of the polymer, making the products discoloration, brittleness, performance degradation, which can not be reused. This process is called oxidative aging or photoaging light flame retardants; able to increase the flame resistance of the material substance called flame retardants. They are mostly first periodic table V, compound VII and combustion speed of the group III element: refers to the length of the sample per unit time of combustion. Synergistic effect: refers to two or more with the use of additives, the total effect is greater than the sum of the individual effects when used alone. Synergy system: complex flame retardant with the use of the interaction between the flame-retardant to improve performance, the system is called a synergistic effect. Synergistic systems commonly antimony - halogen system, phosphorus halide system, phosphorus - nitrogen system. Burning speed: denotes the length of the sample per unit time of WSD Aluminum hydroxide  combustion. Burning speed is horizontal and vertical burning combustion method to measure too. Oxygen index: refers to the sample continued to burn like a candle shape, nitrogen - oxygen mixed gas stream must minimum oxygen content. External friction: polymer materials during the molding process, the polymer melt friction between the surface and processing equipment. Friction: polymer material during the molding process, the molten polymer molecules exist between friction. Lubricants; polymer to reduce friction and external friction, improved melt flow plastics, polymer material during processing to prevent the sticking of the device to ensure the surface smoothness of the added substance called lubricant. Lubricants: prior to processing the plastic ingredients, add a certain compatibility with the polymer lubricant and uniformly dispersed into the material, can reduce the friction between the resin molecules sky lubrication. External lubrication in two ways: one is in the polymer material forming the lubricant coated on the surface processing apparatus, allowed to melt at processing temperatures, and the metal surface of a "thin layer" is formed, the plastic melt and processing equipment to isolate, without adhering to the equipment, or ease of stripping off the roll; Another is compatible with the polymer is very small, it is easy to migrate from inside the polymer during processing On the surface, thereby forming WSD Calcium stearate  a spacer layer material, before the processing of the ingredients added to the plastic dispersion, and migration to the surface during processing, providing lubrication. Mold release agent: Mold and machining the workpiece remain completely chemically inert substance called a release agent. Blowing agents; make a class of blowing agents are liquid or plastic state within a certain viscosity range of rubber, plastic material forming the microporous structure.