申请人:JAPAN SYNTHETIC RUBBER CO., LTD.
公开号:EP0006020A1
公开(公告)日:1979-12-12
When an elastomeric copolymer of a C, or C5 conjugated diene and an aromatic vinyl compound is brominated as a latex while keeping the uniformity of the latex until the amount of bromine combined with the copolymer reaches 0.5 - 15% by weight, the resulting brominated conjugated diene-aromatic vinyl compound rubber typically contains 3 - 80% by weight of a toluene-insoluble fraction formed by the bromination and typically has a high green strength and a good processability. A vulcanized rubber obtained from such a brominated rubber has a high modulus of elasticity and a high tensile strength. When an anionic surfactant is used as an emulsifier, the uniformity of the above-mentioned latex can be kept by adjusting the pH of the bromination reaction system to 9 or higher, preferably 10 or higher, during the reaction or by adding a nonionic surfactant. When a cationic or nonionic surfactant is used as an emulsifier, regulation of pH is unnecessary.
当 C 或 C5 共轭二烯与芳香族乙烯基化合物的弹性共聚物作为胶乳进行溴化,同时保持胶乳的均匀性,直到与共聚物结合的溴量达到 0.5 - 15%(按重量计)时,得到的溴化共轭二烯-芳香族乙烯基化合物橡胶通常含有 3 - 80% (按重量计)由溴化形成的甲苯不溶部分,并且通常具有较高的生坯强度和良好的加工性能。由这种溴化橡胶制成的硫化橡胶具有较高的弹性模量和拉伸强度。当使用阴离子表面活性剂作为乳化剂时,可通过在反应过程中将溴化反应体系的 pH 值调至 9 或更高,最好为 10 或更高,或通过添加非离子表面活性剂来保持上述胶乳的均匀性。如果使用阳离子或非离子表面活性剂作为乳化剂,则无需调节 pH 值。