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对二烯类橡胶进行物理改性,能大大提高橡胶的工艺性能及力学性能。以异戊橡胶为例进行了研究。用转速达3×103～20×103r/min的带凸棱转子(转动频率50～320s-1)反复对异戊橡胶胶粒进行剪切,以此方法提高橡胶大分子的力学性能,对聚异戊二烯橡胶(СКИ-3)进行改性。经物理改性后的生胶СКИ-3M具有良好的工艺性能,其硫化胶的力学性能亦好,特别是抗撕裂性能高。生胶改性后停放两周,制得的硫化胶具有良好的力学性能,改性生胶停放时间超过两周后,制得的硫化胶性能逐渐下降,直降至与未改性的СКИ-3相似。
The physical modification of diene rubber can greatly improve the rubber process performance and mechanical properties. Take isoprene rubber as an example. The isoprene rubber particles were sheared repeatedly with a convex rotor (rotational frequency of 50 ~ 320s-1) at a speed of 3 × 103 ~ 20 × 103r / min to improve the mechanical properties of the rubbery polymer. Isoprene rubber (СКИ-3) was modified. After the physical modification of the raw plastic СКИ-3M has good process performance, vulcanized rubber is also good mechanical properties, especially high tear resistance. The modified rubber was parked for two weeks, the prepared vulcanizates had good mechanical properties. After the modified rubber was left for more than two weeks, the performance of the vulcanizates was gradually reduced to straight with the unmodified СКИ- 3 is similar.