提高乳聚丁苯橡胶转化率的影响因素

Influence factors of increasing conversion of emulsion styrene butadiene rubber

以吉林石化公司生产的丁苯橡胶(1500)为研究对象,以12 h内聚合转化率达到(70±2)%、产品性能与转化率为(62±2)%者相当为目标,研究了引发剂、相对分子质量调节剂、电解质、单体配比与纯度及乳化剂等对丁苯橡胶聚合的影响,测定了不同转化率丁苯橡胶胶乳的机械稳定性及丁苯橡胶生胶和硫化胶的性能。结果表明,在不改变原材料品种和规格的前提下,于氧化剂用量110%(以标准配方所用质量为100%计,下同)、还原剂用量100%和助还原剂用量110%,硫醇初始量与补加量的质量比为100/20、补加时机在反应开始后2 h,电解质用量为110%~115%、初始时一次加入,丁二烯与苯乙烯的质量比为(72.0/28.0)^(72.5/27.5),乳化剂初始量与补加量的质量比为100/10、补加时机在反应开始后2 h的条件下,在12 h内可以使丁苯橡胶1500的聚合转化率提高到(70±2)%,并确保其产品性能全部达到国标优级品标准。

The effects of initiator, relative molecular mass regulator, electrolyte, monomer ratio and their purity, and emulsifier on emulsion polymerization of styrene butadiene rubber （ESBR） were investigated, the mechanical stability of ESBR latex and raw rubber and vulcanizate properties of ESBR with different conversion were measured by using SBR 1500 in Jilin Petrochemical Company as investigated object, conversion reaching to （ 70 ± 2 ） % within 12 h and the properties were equivalent to those of conversion at （62 ± 2 ）%. The results showed that the conversion of SBR 1500 could reach to （70 ±2）% within 12 h with the same properties as conversion （62 ± 2 ）% without changing kinds and specification of SBR 1500 raw material the by using the following reaction oxidant and aid-reductant conditions ： the amount of were 110%, reductant was 100% ; the mass ratio of initial amount to addition amount of molecular weight regulator was 100/ 20, addition time was at polymerization beginning 2 h, the initial amount of electrolyte was 110% - 115%, the mass ratio of butadiene to styrene was （72.0/28. 0） - （72.5/27.5）, the total amount of emulsifier was 110%, the addition amount of emulsifter was 10% and addition time was at polymerization beginning 2 h.