丙烯腈水相沉淀聚合生产工艺研究

摘要

对丙烯腈/醋酸乙烯酯二元共聚体系进行了研究,分析了影响丙烯腈水相沉淀聚合的工艺因素.结果表明:NaClO3的加入量是单体质量的0.45%～0.65%,m(NaClO3):m(NaHSO3)=(1:3)～(1:5),单体浓度为30%～35%,m(AN):m(VAc)控制在7.5～12;聚合停留时间45～50 min;聚合温度55～60℃(偏差在±0.5℃);Cu2+含量30～45 mL/m3;NaNO3加入量为单体质量的0.4%～0.6%;聚合体系pH值是2.1～2.7;巯基乙醇(β-ME)的加人量为单体质量的0.15%～0.55%,搅拌速度为200 r/min左右.在此操作条件下,聚合物平均分子量在48000～64000范围内,聚合反应转化率超过81%,不但满足多种性能腈纶纤维的生产要求,而且经济合理.%AN/VAc terpolymer was studied by aqueous deposited polymerization , the influence factors on precipitation polymerization of acrylonitrile were analyzed in aqueous medium. The result shows that under the conditions of NaClO3/( AN + VAc) mass ratio of 0. 45％ ～0. 65％ , NaClO3/NaHSO3 mass ratio of ( 1∶ 3) ～ ( 1∶ 5) , monomer concentration of 30％ ～ 35％ . AN/VAc mass ratio of 7. 5 ～ 12, polymerization remaining time of 45 ～50 min , polymerization temperature of 55 ～ 60 ℃ ( deviton ± 0. 5℃ ) , Cu2 + content of 30～45 mL/m3·NaNO3/( AN + VAc) mass ratio of 0. 4％ ～ 0. 6％ , the system pH value of 2. 1 ～ 2. 7 ,β-ME/( AN + VAc) mass ratio of 0. 15 ％～ 0. 55％ , stirring velocity about 200 r/min, molecular weight of the polymer was 48 000 - 64 000, the conversion of polymerization over 81％ . Not only can the polymer technology meet the demand of many kinds property acrylic fiber,but also it is economic and reasonable.