PVC commonly used additives
The additive is an integral part of PVC in the production of plastics raw material, which is decided by the inherent characteristics of PVC resin. PVC additives are divided into two categories:
(1) process additive for plastics processing is required. Such as stabilizer and lubricant hard PVC in the production of plastics, without them, cannot be processed.
(2) the functional additive to plastic certain functional or make some properties of PVCplastics have improved, such as impact modifier can be used, the impact toughness isimproved exponentially.
The additive for:
(1) and compatibility of additives of PVC resin can be long-term, stable, uniformly dispersed and play its effectiveness in. Therefore, additives should have good compatibility with PVC. Additives for filler, inorganic pigments are insoluble in PVC,requires the fineness, good dispersion. In addition, additives should not with PVCresin interaction, namely the additive does not promote the degradation of PVC, but was not affected by degradation of PVC HCl.
(2) the durability should meet the volatile small, water, oil or solvent extraction,migration resistant.
(3) processing additive heat resistance should be good at the processing temperature, does not decompose, non-volatile, non corrosive and sublimation ofprocessing equipment and mould.
(4) restricted product performance refers to the product appearance, odor, pollution,durability, electric insulation, heat resistance, weather resistance, toxicity and other aspects of the request.
(5) the additive interaction between sex refers to the synergistic effect between additives or anti effect. Combined with different varieties of the same kind of additivesin the necessary.
(6) the cost of economic additives should be as low as possible.
