摘要
采用镍系催化剂催化苯乙烯-异戊二烯-苯乙烯嵌段共聚物(SIS)加氢,对催化反应的机理及催化剂制备进行了研究,确定了催化剂制备及SIS加氢工艺条件,并对产品的结构及性能进行了考察。结果表明,采用异辛酸镍及三异丁基铝作SIS加氢催化剂,当催化剂陈化温度为50~70℃、陈化时间大于30 min、镍剂及铝剂质量浓度均为25~40 g/L、铝与镍的摩尔比为3.0~4.0时,催化剂活性较高。当催化剂用量为3×10^(-4)~7×10^(-4) g/g时,反应1~2 h的SIS中聚异戊二烯段加氢度大于98%,苯环加氢度小于5%。SIS加氢后,力学性能及耐老化性能得到明显改善。
The hydrogenation of styrene-isoprene-styrene block copolymer(SIS)was catalyzed by nickel-based catalyst,and the mechanism of catalytic reaction was studied.The conditions of catalyst preparation and hydrogenation were determined,and the structure and performance of the product were investigated.The results showed that the activity and selectivity in hydrogenation was high with nickel isooctanoate and triisobutyl aluminum as SIS hydrogenation catalysts.The conditions of the reactions were optimized with the mole ratio of aluminum to nickel was 3.0-4.0 and the mass concentration of nickel and aluminum catalyst was 25-40 g/L at aging temperature 50-70℃ for more than 30 min.The hydrogenation degree of polyisoprene segment in SIS was higher than 98%and the benzene ring was less than 5%with the catalyst amount 3×10^(-4)-7×10^(-4) g/g for 1-2 h.The mechanical properties and aging resistance of SIS were significantly improved after hydrogenation.
作者
梁爱民
LIANG Ai-min(National Engineering Research Center for Synthesis of Novel Rubber and Plastic Materials,Beijing Research Institute of Chemical Industry,SINOPEC,Beijing 102500,China)
出处
《合成橡胶工业》
CAS
北大核心
2021年第5期342-346,共5页
China Synthetic Rubber Industry
