固体发动机用隔热涂料增强改性研究

为了提高固体发动机用隔热涂料的强度,在对隔热涂料特性分析的基础上,分别采用3,3-二氯-4,4-二胺基二苯基甲烷(MOCA)与端异氰酸酯基聚丁二烯(ITPB)预聚和环氧树脂与ITPB预聚2种方法对原有涂料进行了增强改性,并分析了溶剂对涂料强度的影响。结果表明,隔热涂料的固化反应主要是ITPB的异氰酸酯基与MOCA的氨基发生一级反应形成线性高分子,高分子中的硬段和软段在固化过程发生相分离现象使涂料具有良好的韧性和一定的强度。采用2种预聚方法均能提高隔热涂料的强度,同时,适当增加二甲苯含量也有利于提高隔热涂料的强度。

Research on reinforcing modification of thermal insulation coating for solid motor

In order to improve the strength of thermal insulation coating for solid motor,two kinds of methods were used for reinforcing modification on the basis of characteristics analysis of the coating,i.e.prepolymerization of isocyanate terminated polybutadiene(ITPB) with 3,3-dichlorin-4,4-diaminodiphenylmethane(MOCA),prepolymerization of ITPB with epoxy resin.Finally the effects of solvent on strength of the coating were analyzed.The results show that cure reaction of the coating mainly include the first-order reaction between isocyanate of ITPB and the amido of MOCA,which can produce linear high-polymer.The phase separation of hard segments and soft segments of the high polymer during the curing can make the coating possess excellent toughness and strength.Both methods can improve strength of the coating.In addition,the proper content of dimethylbenzene is in favor of strength improvement of the coating.