在液压传动中采用可燃的矿物液压油工作介质,容易发生火灾,因此在国外对难燃液的研究早就受到重视,其推广和应用近年来已取得了很大的进展。据报导,在全世界钢铁工业的连续铸锭设备中,有55％的设备用难燃液。在各国的煤炭工业中,难燃液的研究和应用也很突出,以英国为例,国家煤管局(NCB)所属各矿自1964年以来已有19000套液压设备成功地使用了难燃液,近来NCB每年购买的 In the hydraulic drive using combustible mineral hydraulic oil working medium, prone to fire, so the foreign research on the flame retardant liquid has long been valued, and its promotion and application in recent years has made great progress. It has been reported that 55% of equipment used in the continuous casting of the steel industry in the world is made of refractory fluid. In the coal industry in various countries, research and application of refractory liquids are also prominent. In the United Kingdom, for example, the ore owned by the State Coal Administration (NCB) has used 19,000 sets of hydraulic equipment successfully since 1964 Recently NCB purchased each year