PVC impact modifier which species

 PVC impact modifier and sometimes also from the plasticizing effect , it can also be seen as a plasticizer and an impact modifier for PVC resin are the following :
 ( A ) chlorinated polyethylene (CPE) using the product of HDPE powder was suspended in an aqueous phase chlorination , so as to increase the degree of chlorination of the original crystalline HDPE become amorphous elastomer. Used as a toughening agent C? E, typically containing 25-45 volume % C1 . CPE wide sources , low prices, in addition to a toughening effect , but also has a cold resistance, weather resistance , flame resistance , and chemical resistance . Currently in our country is dominated  PVC window stabilizer by the CPE impact modifiers, especially in the production of PVC pipes and profiles , most factories use CPE. Amount is generally 5-15 copies. CPE can be used in conjunction with other toughening agents , such as rubber , EVA , etc. , the better , but the rubber additives intolerance aging.
 (2) ACR methyl methacrylate , copolymers of acrylic acid ester monomer , ACR impact modifier is best developed in recent years , it can increase the impact strength of the material several times . ACR core-shell structure are an impact modifier , methyl methacrylate - ethyl acrylate composition of the shell polymer , the rubber elastic body segment to the crosslinked butyl acrylate is formed on the particle distribution of the inner core . In particular, impact modified for outdoor use PVC plastic products , PVC plastic window profiles using as an impact modifier ACR compared with other modifiers have good processing performance , smooth surface, anti-aging , high strength fillet features , but the price is more than CPE, high 1 /3. Common foreign brands such as K-355, the general amount of 6-10 parts . Current domestic production manufacturers ACR impact modifier fewer manufacturers use less.
(3) MBS is methyl methacrylate , and styrene- butadiene copolymer of the monomers . MBS solubility parameter between 94-9.5 , close to the solubility parameter of PVC , so when good compatibility with PVC , it 's most important feature: After joining PVC products can be made transparent . Usually the person added 10-17 parts of PVC , PVC can be 6-15 times the impact strength , but the amount more than 30 MBS phr , PVC impact strength decreased. MBS itself has good impact resistance, transparency, and  Plastic impact modifier light transmittance of more than 90 %, and at the same time to improve the impact resistance of the resin other properties , such as tensile strength , elongation at break little effect . MBS higher price , often with other impact modifiers, such as EAV, CPE, SBS and the like used . MBS poor heat resistance , poor weather, do not suitable for long-term use of outdoor products, generally do not do plastic window profiles produced by the impact modifier . (4) SBS styrene , butadiene , styrene ternary block copolymer , also known as thermoplastic rubber, thermoplastic elastomers belonging to its structure can be divided into two kinds of star and linear . Ratio of styrene and butadiene SBS is mainly 30 /70, 40 /60 , 28 / 72 , 48/ 52 several. Mainly used as HDPE, PP, PS impact modifier in an amount 5-15 parts . SBS its main role is to improve the low temperature impact resistance. SBS poor weather, do not suitable for long-term use of outdoor products . (5) ABS styrene ( 40% -50 % ) , butadiene ( 25% -30 % ) , acrylonitrile ( 25% -30 % ) terpolymer used mainly plastics , are also used as PVC impact modified, low-temperature impact modifiers also very effective . When added in an amount of 50 parts of ABS , PVC and the impact strength can be quite pure ABS. ABS is generally added in an amount of 5-20 parts , ABS poor weather , suitable for long-term outdoor use products, generally do not  processing aid do plastic window profiles produced by the impact modifier . (6) EVA is a copolymer of ethylene and vinyl acetate acid , vinyl acetate is introduced to change the crystallinity of polyethylene , vinyl acetate content of large difference , and the different refractive index EVA and PVC , transparent products is difficult to obtain , therefore , often the EVA resin and used with other impact . EVA added in an amount of 10 parts or less.