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• Influence of main indexes of chlorinated polyethylene (CPE) on modification of rigid PVC(6)

  2024 / 10 / 11

  Effect of CPE with different ash mass fraction (ash) on PVC modification: In order to prevent CPE from caking, the line label stipulates that no more than 5% calcium powder can be added to CPE as a spacer. The regular manufacturers use mostly ultra-fine light calcium carbonate, which has high fineness, good dispersion effect, and can effectively and evenly cover the surface of CPE particles, playing a good isolation and anti-caking role. Although it is true that there will be a little dust in the sensory touch, it does not affect the toughness, tensile strength, plasticizing performance and other indicators of CPE, and can be used with confidence.   In recent years, in order to fill up and reduce costs, some manufacturers began to use granular calcium as a CPE isolator, granular calcium is composed of 85% calciu

• Influence of main indexes of chlorinated polyethylene (CPE) on modification of rigid PVC (5)

  2024 / 09 / 30

  Effect of CPE with different particle size (screen residue) on PVC modification: Chlorination process, grinding and so on have a great relationship, CPE too thick or too fine have a certain impact on PVC modification effect. The suspension chlorination of CPE is a heterogeneous reaction, and the particle size of PE has a significant effect on the uniformity of chlorination. If the particle size is small, the specific surface area of the particles is large, the chlorine atoms are easy to penetrate into the particles, and the chlorination is more uniform. If the particle is too coarse, the infiltration of chlorine into the particle is difficult, and the chlorination is not uniform. It was found through experiments that the thickness of CPE particles produced fr

• Influence of main indexes of chlorinated polyethylene (CPE) on modification of rigid PVC(4)

  2024 / 09 / 30

  Effect of CPE with different chlorine content on PVC modification: The compatibility of CPE with PVC depends on the chlorine content of CPE and the distribution of chlorine atoms on the PE molecular chain. The amount of chlorine in CPE has a great influence on the modification effect of PVC. After chlorination of the same polyethylene raw material, different chlorine content has different modification effect on PVC. CPE with chlorine content below 25% is not compatible with PVC, so it is not suitable for PVC modification. CPE with a chlorine content of more than 40% has excellent compatibility with PVC, and can be used as a plasticizer for PVC, not suitable for use as an impact modifier; CPE with a chlorine content of 35 ~ 36% has low crystallinity and glass conversion temperature, good elasticity and compatibility with PVC, and is widely used as an impact modifier for hard PVC products.