PVC impact modifier some kind described

PVC impact modifier is sometimes also from the plasticizing effect , it can also be seen as a plasticizer , while for PVC resin impact modifier are summarized as follows :
 ( 1 ) Chlorinated polyethylene (CPE) is the use of HDPE in the water phase of the powdery product by suspension chlorination , so as to increase the degree of chlorination of HDPE original crystals become amorphous elastomer. Used as a toughening agent C? E, containing 25-45 % amount fluorescent brightener  is generally C1 . CPE wide source of low price, in addition to a toughening effect , but also has a cold resistance, weather resistance , flame resistance , and chemical resistance . At present in China is dominated by CPE impact modifiers , especially in the production of PVC pipes and profiles , most plants use CPE. Generally added in an amount of 5-15 copies. CPE can be used in conjunction with other plasticizer , such as rubber , EVA , the effect is better, but even in aging rubber additives .
 (2) ACR is methyl methacrylate , acrylate monomers , ACR is best developed in recent years, impact modifiers , which can increase the impact strength of the material several times. ACR core-shell structure is an impact modifier , methyl methacrylate - ethyl acrylate composition of the shell polymer , crosslinked acrylic or butyl rubber elastic body is formed as the core of the particle distribution of the inner segment . Particularly suitable for outdoor use PVC plastic products, impact-modified PVC plastic window profiles used in the ACR as impact modifiers and other modifiers processing performance compared with the smooth surface, good aging resistance , high strength welding angle characteristics, but the price CPE, high 1 /3. Common foreign brands such as K-355, the general amount 6-10 copies. The current domestic production of the manufacturers ACR impact modifier fewer manufacturers use less.
 ( 3 methyl methacrylate , butadiene and styrene copolymer of the monomers . MBS 94-9.5 a solubility parameter between the solubility parameter close to that of PVC , PVC is therefore compatible with the better, it 's most important feature: after adding PVC products can be made transparent . generally added in PVC 10-17 copies can be improved impact strength of PVC 6-15 times, but the MBS in amount more than 30 parts , PVC but decreased the impact strength . MBS itself has a good impact resistance , good transparency , light transmission rate of 90 %, and to improve the impact resistance  heat stabilizer for panel while other properties of the resin , such as tensile strength, breaking elongation little effect on growth rate , etc. . MBS higher prices , often with other impact modifiers, such as EAV, CPE, SBS , etc. and use . MBS poor heat resistance , weather resistance is poor, that are unsuitable for long-term outdoor use of products , generally do not make plastic window and door profile production impact modifiers used .
 (4) SBS is a styrene -butadiene- styrene block copolymers, also known as thermoplastic rubber, thermoplastic elastomer part , the structure can be divided into star and line two kinds. SBS ratio of styrene to butadiene is mainly 30 /70, 40 /60 , 28 / 72 , 48/ 52 several. Mainly used as HDPE, PP, PS impact modifiers in an amount 5-15 parts . SBS primary role is to improve the low temperature impact resistance . SBS poor weather, not suitable for long-term outdoor use made ​​products. (5) ABS is a styrene ( 40% -50 % ) , butadiene ( 25% -30 % ) , acrylonitrile ( 25% -30 % ) terpolymer used mainly plastic , PVC is also used impact modified , low-temperature impact modifiers also very effective. ABS is added in an amount of 50 parts , PVC , the impact strength can be quite pure ABS . ABS is generally added in an amount of 5-20 parts , ABS poor weather , unsuitable for long-term outdoor use  titanium dioxide anatase products, generally do not do plastic doors and windows profile production impact modifiers . (6) EVA is an ethylene vinyl acetate and acid copolymer, vinyl acetate changed into a crystalline polyethylene , vinyl acetate content of a 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 dosage of 10 parts or less .