合成杜仲胶与天然杜仲胶的改性及性能研究

摘要

Gutta-percha/HDPE was prepared by blend method .The influence of process on mechanics performance and shape memory performance were studied in the paper .The re-sults showed that the formula(S 1 phr ,HDPE 15 phr ,Silica 20、40 phr ,KH-560 2 phr) is the best for synthetic and natural gutta-percha .The best vulcanized temperature and the time are 165 ℃ ,15 min ,and 155 ℃ ,20 min .The softening point of vulcanized gutta-percha is about 56 ℃ and 53 ℃ .The thermal recovery ratio is high and the cold recovery ratio is about 0 .The mechanics performance and shape memory performance of products strengthen when added KH-560 .Melting point and hardness of the blends of natural gutta-percha are smaller than synthetic .The color is darker than the synthetic gutta-percha .Other physical and mechanical properties of gutta-percha blends are not significant .%采用高密度聚乙烯（HDPE）分别对合成杜仲胶、天然杜仲胶进行共混改性，并研究了制备工艺对力学性能和形状记忆性能的影响。结果表明，合成杜仲胶、天然杜仲胶体系中的硫、高密度聚乙烯、白炭黑、K H-560等的最佳质量分数分别为1、15、20（40）、2；最佳硫化温度为165℃、155℃；最佳硫化时间为15 min、20 min 。合成杜仲胶、天然杜仲胶混炼胶的软化点分别为56℃、53℃，热回复率高且回复极快，冷回复率几乎为0；体系中加入K H-560后，材料的记忆性能和力学性能增强；天然杜仲胶的熔点、硬度都比合成杜仲胶小，其制品颜色较合成杜仲胶深，其它物理机械性能与合成杜仲胶相差不大。