摘要
ＳＬＯＷＰＥＬＬＥＴＩＮＧＣＯＡＧＵＬＡＴＩＯＮＯＦＰＯＬＹＭＥＲＬＡＴＥＸＥＭＵＬＳＩＯＮ￥ＹｕｎＭｉｎｇＬＩ；ＭｉＷｅｎＣＨＥＮ；ＧｕｏＪｕｎＸＵ；ＳｕＨｕｉＯＵａｎｄＫａｉＷＡＮＧ（ＤｅｐａｒｔｍｅｎｔｏｆＰｏｌｙｍｅｒＳｃｉｅｎｃｅａｎｄＥｎ...
In this paper, slow pelleting flocculation of polymer latex consisting of butadiene, styrene and methyl methacrylate(MBS) were investigated, using aqueous H2SO4 as coagulant. It is found that spherical particles with uniform particle size and high bulk density were produced in the narrow range of pH. In order to obtain good particle morphology, well-distributed concentration, temperature and shear field in the coagulating system were required. Polymer latex made from emulsion polymerization often needs to be converted into dry powders. Usually, we simply add excessive coagulant, such as inorganic acid, salt, etc., into latex emulsion to make it coagulate. The particles formed with such method always have irregular shape and high fines content. In recent years, more attention has been paid to the method of getting coagulated particles with satisfactory particle morphology(1-3)].
