The most practical
PVC Processing Aid Its structure is between the two structures, such as ABS. Specific varieties of PVC resin are:
(1)
Chlorinated Polyethylene (CPE): A powdery product that uses HDPE to suspend chlorination in the water phase. As the degree of chlorination increases, the original crystalline HDPE gradually becomes an amorphous elastomer. CPE used as a toughening agent generally contains 25%-45% Cl. In the production of PVC pipes and profiles, most factories use CPE. The amount added is generally 5-15 parts.
(2) ACR: It is the best
Impact Modifier developed in recent years, which can increase the impact strength of materials dozens of times. It is suitable for impact modification of PVC plastic products used outdoors. It is used in PVC plastic door and window profiles. It has the characteristics of good processing performance, smooth surface, good aging resistance, and high weld angle strength, but the price is about 1/3 higher than CPE.
(3) MBS: The solubility parameter is between 9.4 and 9.5, which is close to that of PVC, so it has better compatibility with PVC. After adding PVC, it can be made into a transparent product. Generally, adding 10-17 parts to PVC can increase the impact strength of PVC by 6-15 times, but when the amount of MBS added is 30 parts larger, the impact strength of PVC will decrease instead. The price of MBS is relatively high, and it is often used together with other additives such as EAV, CPE, and SBS. MBS has poor heat resistance and poor weather resistance, so it is not suitable for long-term outdoor use, and generally does not need to be used as plastic door and window profiles.
(4) ABS: It is mainly used as engineering plastics, and also used as PVC impact modification, and the effect of low temperature impact modification is also very good. When the amount of ABS added reaches 50 parts, the impact strength of PVC can be equivalent to that of pure ABS. The amount of ABS added is generally 5-20 parts. ABS has poor weather resistance and is not suitable for long-term outdoor use products. Generally, it is not used as an impact modifier for the production of plastic door and window profiles.
(5) EVA: Moreover, the refractive index of EVA and PVC is different, and it is difficult to obtain transparent products. EVA is often used together with other impact-resistant resins. The amount of EVA added is less than 10 parts.
