impact modifier and processing modifier some of the main features

Impact modifiers and processing modifier
( A ) impact modifiers and processing modifier function
1 , the performance of impact modifier
To improve the impact properties of plastic additives added for the purpose referred to as impact modifier . These  Plastic chemical additives can not only improve the impact strength of the resin , but also to improve the processability of the resin . Impact modifier is typically used in rigid PVC , but in polypropylene, polystyrene and modified plastics has universal application. Currently , rigid PVC impact modifier used mainly some copolymer resin or a modified resin such as ABS, MBS, EVA, CPE , and thermoplastic rubber , thermoplastic elastomers , which are widely used as PVC, PE, PP, PS, AS, ABS, PMMA, PA, PC, PBT, PET and so on. Impact modifier may be added into a ductile plastic brittle plastics can be applied only in the normal temperature of the plastic into a plastic used at low temperatures , in addition , can effectively improve the processing properties of plastics .
Ideal resistance modifier should have the following properties:
① and modification of the substrate must have a good compatibility.
② modifier particle size, morphology medium a diameter of about 200nm is appropriate to protect the effect is a high impact strength .
③ modifier to lower the glass transition temperature is preferred.
④ impact modifier preferably has slightly crosslinked to improve the reinforcing effect .
⑤ modifier processing properties of the resin without prejudice to its apparent performance and physical and mechanical properties without  plastic additive adverse effects.
⑥ requires non-toxic, non-polluting and affordable.
2 , the processing performance modifier
Processing modifier for plastic processing performance is poor and development of a class of additives that are added to improve the polymer in the molten resin flow , and a thermal stability, heat distortion resistance and surface gloss of the material products . Currently, the processing modifier is mainly to improve the melt viscosity of PVC , improved flowability and processability.
Processing modifier primarily polymer, the application is more acrylic copolymer , such as methyl methacrylate / acrylic acid copolymer system (MMA / FA system ) , methyl methacrylate / butyl methacrylate acrylate / ethyl acrylate / methyl methacrylate copolymer systems (MMA / BMA / EA / EMA system ) , methyl methacrylate / ethyl acrylate / acrylonitrile copolymer system (MMA / EA / AN system ), etc. The amount of resin added is usually from 3% to 8%.
( Two ) impact modifiers and processing modifier classification and species
1 , impact modifiers and species classification
① acrylonitrile - butadiene - styrene copolymer (ABS): ABS resin is a graft copolymer of polybutadiene latex is added to the styrene and acrylonitrile monomers copolymerized . Impact modifier for PVC, ABS has a good effect, the toughening effect, while the tensile strength and elongation decrease is small, the general amount of 10% to 20%. ABS resin due  antimony flame retardant to the presence of unsaturated structures , weather is poor, so products should not be long-term outdoor use . ABS resin is less than the compatibility with PVC, MBS, the product transparency is not as good MBS copolymer ; such as a transparent ABS and PVC blends can obtain a transparent products. When the ABS dosage of 20% to 30 %, the impact strength with excellent results.