ASA resin is a ternary graft copolymer composed of acrylonitrile, styrene and acrylate. It is a non-crystalline polymer obtained by graft copolymerization of acrylonitrile and styrene as a main chain of polyacrylate. ASA was first industrialized by the German company BASF in 1962, and then Japan's Hitachi Chemicals also achieved industrial production; currently, ASA is a major product of GE. Domestic research on ASA is relatively late. Zhejiang University, Beijing University of Chemical Technology, Lanzhou Petrochemical Research Institute and other units have developed research, but there is no industrial production. ASA is an opaque yellow amorphous polymer, odorless and non-toxic, its flame retardancy reaches UL94HB grade, burning slowly, emitting odor with benzene and rubber; ASA relative density is 1.05-1.09, notched impact strength is 480- The tensile strength is 380 J/m, the tensile strength is 38-48 MPa, and the heat distortion temperature is 85-105 under the load of 1.86 MPa. C, can be -20 to 75 for a long time. Used under C, has good high temperature resistance, good environmental stress crack resistance, oil resistant, hydrochloric acid resistant solution, olefinic acid and alkali, but not resistant to esters, ketones, aromatics, chlorinated and alcohols. erosion. Compared with ABS, ASA and ABS do not contain double bonds. They not only resist degradation, aging and fading caused by UV first irradiation, but also prevent heat and oxygen during processing to prevent decomposition and discoloration. Because of this, ASA has become one of the best weather-resistant varieties in plastics, and its aging resistance is more than 10 times higher than that of ABS. However, the shortcomings of ASA itself are poor flame retardancy. The flame retardant grade can only reach UL94-HB. Adding flame retardant will make the ASA material toughness decrease sharply and the material becomes brittle, thus limiting the ASA material in some fields. Applications.