摘要
硅氧烷阻燃剂是一种新型高效、环境友好的无卤阻燃剂,硅氧烷双酚(SBP)和双酚A(BPA)共聚在聚碳酸酯中引入Si—O键和Si—C键,可以获得阻燃性能、透明性和耐低温性能良好的硅氧烷双酚型共聚碳酸酯(SBP-PC)。首先以邻烯丙基苯酚和1,1,3,3-四甲基二硅氧烷为原料,采用Karstedt催化剂合成SBP,然后以SBP,BPA和三光气(BTC)为原料,采用界面缩聚法制备SBP-PC。红外吸收光谱验证了SBP和SBP-PC的结构。考察了SBP和BPA的物质的量比对SBP-PC的阻燃性能、耐热性能和力学性能的影响,得到SBP与BPA的最佳物质的量比为8∶92。经检测,最佳物质的量比时SBP-PC的垂直燃烧级别为V-0级,极限氧指数为39.2%,通过了针焰试验,表明其阻燃性能较双酚A型聚碳酸酯(BPA-PC)有了显著提高。SBP-PC的玻璃化转变温度为145.5℃,略低于BPA-PC,耐热性能略有下降。SBP-PC的5%热失重温度为446℃,高于BPA-PC,说明其有更好的热稳定性。通过低温测试,SBP-PC在-30℃时简支梁缺口冲击强度下降幅度仅为13.19%,其低温耐冲击性能良好。SBP-PC具有很好的透光率和低的雾度,光学性能良好。共聚PC在力学性能和透光率上显著优于共混PC。
Siloxane flame retardant is a new kind of halogen-free flame retardant,which is highly efficient and environmentally friendly.Siloxane bisphenol type copolycarbonate(SBP-PC)with good flame retardant,transparency and low temperature resistance could be obtained by copolymerization of siloxane bisphenol(SBP)and bisphenol A(BPA)to introduce Si—O bond and Si—C bond into polycarbonate.First,siloxane bisphenol was synthesized from o-allylphenol and 1,1,3,3-tetramethyldisiloxane.Then,SBP-PC was prepared by interfacial polycondensation method using SBP,BPA and triphosgene as raw materials.The structures of SBP and SBP-PC were verified by infrared absorption spectroscopy.The influence of molar ratio of SBP and BPA on the properties of SBP-PC was investigated,and the best molar ratio was obtained.The vertical combustion grade of SBP-PC is V-0,and the oxygen index is 39.2%,which passes the needle-flame test,indicating that its flame retardant performance has been significantly improved.The glass transition temperature is slightly lower than that of bisphenol A type polycarbonate(BPA-PC),and the heat resistance is slightly decreased.The thermal weight loss temperature of 5%is 446℃,indicating that it has better thermal stability.According to the low temperature test,the charpy impact strength of SBP-PC decreases only by 13.19% at-30℃,and its low temperature impact resis‐tance is good.SBP-PC has good light transmittance and low fog,which indicates that its optical performance is good.The mechani‐cal properties and light transmittance of copolymerized PC are significantly better than those of blended PC.
作者
鄂永胜
张丹凤
刘明辉
E Yongsheng;ZHANG Danfeng;LIU Minghui(School of Biomedical and Chemical Engineering,Liaoning Institute of Science and Technology,Benxi 117004,China)
出处
《工程塑料应用》
北大核心
2025年第2期45-51,共7页
Engineering Plastics Application
基金
辽宁省教育厅科研项目-科研创新团队项目(LJ222411430018)。
关键词
硅氧烷双酚
聚碳酸酯
制备
性能
阻燃
siloxane bisphenol
polycarbonate
preparation
property
flame retardant
