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针对环氧树脂固化物质脆、冲击强度低,容易产生应力开裂,从而影响绝缘浇注制品的质量的缺点,人们一直致力于增加环氧树脂的韧性,橡胶改性环氧树脂研究取得新进展作为其重要途径,近年取得了新的进展。1.橡胶改性环氧树脂的过去发展最初人们采用的方法是加入一些增塑剂、增柔剂,加入这些低分子量物质大大降低材料的耐热性、硬度、模量及电性能。从20世纪60年代开始,国外开展了用反应性液态合物(RLP)增韧环氧树脂的研究工作,以期在热性能、模量及电性能下降不的情况下提高环氧树脂的韧性。改性橡胶的要求是:所用橡胶在固化前必须与环氧树脂相溶。而环氧树脂固化时,橡胶能顺利的析出来,形成两相结构;橡胶应能与环氧树脂发
In view of the brittleness and low impact strength of the cured epoxy resin material, stress cracking easily occurs and the quality of the insulated cast product is affected. People are always trying to increase the toughness of the epoxy resin. New progress has been made in the research of the rubber modified epoxy resin Important way, made new progress in recent years. 1. The past development of rubber modified epoxy resin Initially, people used to add some plasticizers, softeners, adding these low molecular weight materials greatly reduce the material heat resistance, hardness, modulus and electrical properties. Since the 1960s, research on toughening epoxy resin with reactive liquid compounds (RLP) has been carried out in foreign countries in order to improve the toughness of epoxy resin without decreasing the thermal performance, modulus and electrical properties. Modified rubber requirements are: the rubber used must be compatible with the epoxy resin before curing. The epoxy curing, the rubber can be successfully precipitated to form a two-phase structure; rubber should be able to epoxy resin hair