论文部分内容阅读
采用双酚A扩链低分子质量环氧树脂,扩链得到的高分子质量环氧树脂再与一元不饱和酸反应合成乙烯基酯树脂。通过环氧值、酸值、粘度、固含量及体系固化特性和力学性能测试等研究了原料,催化剂种类及用量,反应温度及时间,体系酸值等对扩链及乙烯基酯树脂合成的影响,并对合成的乙烯基酯树脂的性能进行了考察。结果表明,最优扩链反应条件如下:选用E-54为低分子质量环氧树脂,乙基三苯基溴化膦为扩链催化剂,添加质量分数为0.15%~0.2%,扩链反应温度170℃,反应时间2 h。乙烯基酯树脂合成反应终点酸值为5.6时,体系的反应程度为95%。合成的乙烯基酯树脂的拉伸强度与断裂伸长率明显提高,具有良好的工艺性能和力学性能。
Using bisphenol A chain extension of low molecular weight epoxy resin, the chain extension of the macromolecular quality epoxy resin and monovalent unsaturated acid reaction of vinyl ester resin. The effects of raw materials, catalyst type and amount, reaction temperature and time, acid number of the system on the synthesis of chain extension and vinyl ester resin were investigated by epoxy value, acid value, viscosity, solid content, curing property and mechanical properties. , And the properties of the synthesized vinyl ester resin were investigated. The results showed that the optimum conditions for chain extension were as follows: E-54 as the low molecular mass epoxy resin and ethyltriphenylphosphonium bromide as the chain extension catalyst were added. The mass fraction of the chain extension was 0.15% ~ 0.2% 170 ℃, reaction time 2 h. Vinyl ester resin synthesis end-point acid value of 5.6, the degree of reaction of the system was 95%. Tensile strength and elongation at break of the synthesized vinyl ester resin are obviously improved, and have good technological properties and mechanical properties.