Some simple request intenal lubricant's

pvc lubricants lubricants can be divided into two kinds of internal and external lubricant pvc pvc, pvc external lubricant main role is to improve the frictional heat the metal surface of the polymer melt and processing equipment. It is less compatible with the polymer is easy to migrate out from the melt, so the lubrication can be formed in a thin WSD Polyethylene wax  layer of plastic and metal melt interface. pvc lubricants have good compatibility with the polymer properties, which serves to reduce the effect of cohesion between the polymer molecules within the polymer, thereby improving the plastic melt in the heat of friction and melt flowability. Commonly used lubricants are stearic acid and salts thereof outside; internal lubricant is a low molecular weight polymer. Function of some other lubricants. Each lubricant has actually can achieve a required role in internal and external lubrication always together, but in a way more prominent. A lubricant with different polymers under different processing conditions or exhibit different lubrication, such as high temperature, high pressure, pvc in the lubricant will be squeezed out and become pvc external lubricant. From the perspective of processing machinery, in mixing, rolling, etc. slush molding process, external lubricant has an important role in extrusion, injection molding, the lubricant is more effective. The amount of lubricant is generally 0.5% to 1%, the choice should pay attention to the following aspects: (1) the flow properties of the polymer molding process needs have been met, then the role of the main considerations lubrication to ensure internal and external balance; ( 2) lubrication is valid, it can be in the temperature during molding, the plastic surface to form a complete liquid film, and may be so close to the melting point of the lubricant outside the molding temperature, but to a difference of 10 ℃ ~ 30 ℃ order to form a complete film; (3) When selecting a lubricant in production should be so as to achieve the following requirements: (4) moderate size, the internal balance and external lubrication resin compatibility effect; non-blooming, easy scaling; (5) surface gravity is small, small viscosity, the expansion of the interface, easy to form an interface layer;
(6) as far as possible without reducing the  WSD Metallic stearate excellent properties of the polymer, does not affect the performance of the secondary processing of plastics;
(6) itself is excellent in heat resistance and chemical stability, does not decompose during processing, non-volatile;
(7) non-corrosive, does not pollute the film, there is no toxicity.
However, the mere use of a lubricant is often difficult to achieve the purpose, to be used in combination of several lubricants, lubricating composite developed rapidly in recent years, the choice can be to look at the role of multi-angle lubricant. Commonly used lubricants are stearic acid, butyl stearate, oleic acid amide, ethylene bis stearic acid amide.
Many substances can be used as a lubricant wax, natural waxes such as liquid paraffin (mineral oil), microcrystalline wax, etc., but the effect is mixed. Natural waxes more to do with external lubrication, the lubricant can be used as a variety of plastic, a release agent, generally the amount of 0.2 ~ 1phr, but its compatibility, thermal stability and dispersibility is not good, the amount is not too large, and preferably lubricants and use; while shortening more to do with PVC, PS, lubricants, lubricating properties, thermal stability is also very good, the general amount 0.5phr they are drug-free, can be used for food packaging. Another kind of microcrystalline wax: in the plastic processing is also used as a lubricant in an amount of 1 ~ 2Phr, good thermal stability and lubricating property than normal paraffins. Low molecular weight polymers are widely used as a lubricant such as polyethylene wax, low molecular weight polypropylene, the inner and  WSD Chlorinated paraffin outer are better lubricity, and non-toxic. Polyethylene wax materials suitable for PVC extrusion, calendering, the amount is generally 0.1 ~ 1phr, processing efficiency can be improved to prevent the adhesion of the film to improve the dispersion of fillers or pigments, compatibility and transparency is not good; irregular low molecular weight polypropylene as the structure rigid PVC, PE lubricant, excellent performance, other additives to improve dispersibility.