Chain-transfer agent Dimethydithiocarbamate Sodium Diisopropylbenzene Ferrous sulfate heptahydrate [´soʊdiəm] Tert-dodecyl mercaptan
Pyrophosphate
[ˌpaɪrə'fɒsˌfeɪt]
quench radicals and prevent excessive branching and
microgel formation.
混合物在搅拌下50℃加热,每小时转化5%~6%,在转化率达70%~75%时
通过加入“终止剂” 聚合反应终止,例如对苯二酚(大约0.1的重量百分含 量),抑制自由基并避免过量支化和微凝胶形成。
这些油添加剂使橡胶更易加工体现在低成本和性能方面低损耗;他们 在凝胶之前通常乳化并与胶乳混合。
Recent trends have been toward products designed for specific uses. The color of SBR, which is important in many nontire uses, has been improved by the use of lighter-colored soaps, shortstops, antioxidants, and extending oils. For example, dithiocarbamates are substituted for hydroquinone as shortstop; the latter is used on hot SBR where dark color is not objectionable.