Low-molecular-weight styrene-maleic anhydride copolymer and preparation method thereof

The invention discloses a low-molecular-weight styrene-maleic anhydride copolymer which at least comprises the following preparation raw materials: styrene and maleic anhydride, and the molar ratio of the styrene to the maleic anhydride is 1: (1-9). According to the invention, the 2, 3-dimethyl-2, 3-diphenylbutane is adopted as an end-capping accelerant to act together with the di-tert-butyl peroxide initiator, so that the prepared styrene-maleic anhydride copolymer is low in molecular weight, low in yellowness and stable in acid value. The process is simple, continuous production can be realized, the production efficiency is high, a molecular weight regulator is not adopted, and the product is low in odor, less in residue and transparent. 本发明公开了一种低分子量的苯乙烯马来酸酐共聚物，所述制备原料至少包括：苯乙烯和马来酸酐，所述苯乙烯和马来酸酐的摩尔比为1：(1-9)。本发明采用2,3-二甲基-2,3-二苯基丁烷作为封端促进剂，与过氧化二叔丁基引发剂共同作用，制备得到的苯乙烯马来酸酐共聚物分子量低，黄度低，酸值稳定。本发明工艺简单，可连续化生产，生产效率高，并且不采用分子量调节剂，产品气味低、残留少，产品透明。