Fluoroelastomer gum or crumb is isolated from fluoroelastomer dispersions by the addition of a water-soluble polymeric coagulating agent to the dispersion. This coagulating agent comprises either a homopolymer of ethylene oxide (CH2CH2O—) or a copolymer of ethylene oxide. Specific examples of such copolymers include, but are not limited to ethylene oxide-propylene oxide copolymers and ethylene oxide-butylene oxide copolymers. The viscosity average molecular weight (Mv), determined by rheology, of the coagulant polymer must be at least 500,000 and preferably greater than 2,000,000.
氟橡胶胶或颗粒是通过向分散体中添加
水溶性高分子凝固剂来分离
氟橡胶分散液而获得的。该凝固剂包括乙氧基(CH2CH2O—)的均聚物或乙氧基的共聚物。这些共聚物的具体例子包括但不限于乙氧基
丙烯酸酯共聚物和乙氧基
丁烯酸酯共聚物。凝固剂聚合物的粘度平均分子量(Mv),由流变学确定,必须至少为500,000,最好大于2,000,000。