论文部分内容阅读
以环氧树脂(E-44)、偏苯三酸酐(TMA)及聚乙二醇(PEG4000)为原料,在催化剂三氟化硼乙醚作用下,合成出一种含羧基和羟基双亲水基团的多嵌段环氧乳化剂,再利用相反转法制备出水性环氧乳液。乳化剂的结构通过FTIR、1HNMR和GPC进行分析。探讨了催化剂用量、反应温度和反应时间对乳化合成过程中的酯化率及环氧转化率的影响,并研究了乳化剂用量及乳化温度对所制乳液稳定性的影响。结果表明,合成乳化剂的最佳条件是:催化剂用量(占反应物总质量)为0.36%,酯化反应2 h,温度70℃,酯化率达到96.6%;环氧开环反应时间为5 h,温度95℃,环氧转化率达到94.2%。当乳化剂用量(占E-44质量)为15%,乳化温度为60℃时,所制得的乳液平均粒径约为312 nm,并且具有良好的稳定性能。
In the presence of a catalyst of boron trifluoride etherate, epoxy resin (E-44), trimellitic anhydride (TMA) and polyethylene glycol (PEG4000) Paragraph epoxidation emulsifier, then use the phase inversion method to prepare the water-based epoxy emulsion. The structure of the emulsifier was analyzed by FTIR, 1H NMR and GPC. The influence of the amount of catalyst, reaction temperature and reaction time on the esterification rate and epoxy conversion rate in the process of emulsification was discussed. The effects of emulsifier dosage and emulsification temperature on the stability of the emulsion were also studied. The results showed that the optimum conditions for the synthesis of emulsifier were as follows: the amount of catalyst (total mass of reactants) was 0.36%, the esterification reaction was 2 h, the temperature was 70 ℃, the esterification rate was 96.6%, the ring opening reaction time was 5 h, temperature 95 ℃, the epoxy conversion rate reached 94.2%. When the amount of emulsifier (accounting for E-44) is 15% and the emulsifying temperature is 60 ℃, the average particle size of the obtained emulsion is about 312 nm and has good stability.