ABS is a graft copolymer of acrylonitrile, butadiene and styrene. Its molecular formula can be written as (C8H8. C4H6. C3H3N) x, but in fact, it is often a mixture of butadiene graft copolymer and acrylonitrile styrene copolymer. Acrylonitrile is 15%~35%, butadiene is 5%~30%, styrene is 40%~60%, the most common proportion of ABS in emulsion method is A:B:S=22:17:61, and the proportion of B in bulk ABS is usually low, about 13%. The molding temperature of ABS plastic is 180-250 ℃, but it’s better not to exceed 240 ℃. At this time, the resin will decompose.
With the adjustment of the proportion of the three components, the physical properties of the resin will change to a certain extent1,3-butadiene provides low temperature ductility and impact resistance for ABS resin, but too much butadiene will reduce the hardness, luster and fluidity of the resin;Acrylonitrile provides ABS resin with hardness, heat resistance, acid alkali salt resistance and other chemical corrosion properties;Styrene provides hardness, processing fluidity and surface finish for ABS resin.