Three factors affecting the performance of CPE
1. The kind of PE used -- the CPE obtained from high molecular weight polyethylene has higher viscosity and tensile strength, but the adhesion between the CPE and PVC resin is low, and the viscosity and tensile strength of the CPE obtained from low molecular weight polyethylene are lower The CPE obtained by using high-density polyethylene had good heat-resistance and degeneration properties.
2. The size of raw material particles-too small size, easy to form Gel or bulk CPE, when the size is too large, the uneven distribution of chlorine, insoluble in organic solvents, particle size range of 0.1-200 M.
3. The chlorination degree of CPE-when the chlorine content is below 25% , it has poor compatibility with PVC and can not be used as modifier; when the chlorine content is above 40% , it has good compatibility with PVC and can be used as solid plasticizer, it is not suitable for impact modifier; CPE with chlorine content of 36-38% has good elasticity and compatibility with PVC, so it is widely used as impact modifier for PVC. The most commonly used CPE is 35% chlorine content. The CPE with 35% chlorine content has low crystallinity and glass transition temperature, good rubber elasticity and good compatibility with PVC It is widely used as impact modifier for PVC rigid products.
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