(1) CPE

Chlorinated polyethylene (CPE) is a powdered product of suspended chlorination of HDPE in the aqueous phase. With the increase of chlorination degree, the originally crystalline HDPE gradually becomes an amorphous elastomer. CPE used as a toughening agent generally has a C1 content of 25-45%. CPE has a wide range of sources and low prices. In addition to its toughening effect, it also has cold resistance, weather resistance, flame resistance, and chemical resistance. At present, CPE is the dominant impact modifier in China, especially in the production of PVC pipes and profiles, and most factories use CPE. The addition amount is generally 5-15 portions. CPE can be used in conjunction with other toughening agents, such as rubber and EVA, to achieve better results, but rubber additives are not resistant to aging.

(2) ACR

ACR is a copolymer of monomers such as methyl methacrylate and acrylic ester. It is the best impact modifier developed in recent years and can increase the impact strength of materials by several tens of times. ACR belongs to the impact modifier of core-shell structure, consisting of a shell composed of methyl methacrylate ethyl acrylate polymer, and a rubber elastomer formed by crosslinking with butyl acrylate as the core chain segment distributed in the inner layer of particles. Especially suitable for impact modification of PVC plastic products for outdoor use, using ACR as an impact modifier in PVC plastic door and window profiles has the characteristics of good processing performance, smooth surface, good aging resistance, and high welding corner strength compared to other modifiers, but the price is about one-third higher than CPE. Commonly used brands abroad, such as K-355, typically require 6-10 servings.

(3) MBS

MBS is a copolymer of three monomers: methyl methacrylate, butadiene, and styrene. The solubility parameter of MBS is between 94 and 9.5, which is close to the solubility parameter of PVC. Therefore, it has good compatibility with PVC. Its biggest feature is that after adding PVC, it can be made into a transparent product. Generally, adding 10-17 parts to PVC can increase its impact strength by 6-15 times. However, when the amount of MBS added exceeds 30 parts, the impact strength of PVC actually decreases. MBS itself has good impact performance, good transparency, and a transmittance of over 90%. While improving impact performance, it has little effect on other properties of the resin, such as tensile strength and elongation at break. MBS is expensive and often used in combination with other impact modifiers such as EAV, CPE, SBS, etc. MBS has poor heat resistance and weather resistance, making it unsuitable for long-term outdoor use. It is generally not used as an impact modifier in the production of plastic door and window profiles.

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