Explanation

Also called impact modifier, it refers to the substance that can give macromolecule materials better toughness and improve impact strength of materials. According to the composition, it can be roughly divided into three categories: ① rubber type toughening agents (such as liquid polysulfide rubber, liquid acrylic rubber, acrylonitrilebutadiene rubber, ethylene propylene rubber, styrene butadiene rubber, etc.); ② resin (such as polyurethime, styrene, polyolefin, syndiotactic 1,2-polybutadiene and polyamide); ③ Rigid particle modifiers (such as CaCO3, PS, etc.). The initial effect of toughener depends on its compatibility with the toughened materials (i.e. interface adhesion) and its own dispersity (i.e. particle size and distribution). The former is mainly determined by its own nature, while the latter is mainly influenced by processing conditions. Generally speaking, one kind has toughening effect only on one or several macromolecule materials, such as acrylonitrile-butadi- ene-styrene copolymer (ABS), methyl methacrylate butadiene styrene ternary copolymer (MBS) is the most commonly used initiator for polyvinyl chloride, ethylene propylene rubber and rigid particles can be used as polypropylene, maleic anhydride grafted ethylene propylene rubber can be used as nylon resin, etc. The dosage depends on the required toughening degree of materials and its own characteristics, generally between 5% and 25%.

Classification