Abstract:

The prepared epoxy acrylate was modified by toluene diisocyanate (TDI), affording the urethane modified acrylate pre-polymer with interpenetrating network structure. The effects of modifier dosage, reaction time, reaction temperature, catalyst type and amount on the conversion rate were studied. Infrared spectroscopy was used to characterize the structure of the modified product. In the mean time, the modified product ensile strength of the cured film and curing film elongation at break were analyzed. The highest conversion rate was obtained under the following condition: the amount of modifying agent (TDI) and epoxy acrylate mole ratio was 0.25∶1, reaction time 5 h, the reaction temperature was 75 ℃, the mass ratio of the composite catalyst（triethylamine and DBTD）was 1:1, added in an amount of 0.1%. IR spectra confirmed the formation of the modified pre-polymer.

Key words: Epoxy acrylates, Pre-polymers, Modification

摘要： 采用甲苯二异氰酸酯(TDI)对自制环氧丙烯酸酯进行改性,制备具有氨酯-丙烯酸互穿网络结构的预
聚物。考察了改性剂用量、反应时间、反应温度、催化剂种类及用量对转化率的影响,利用红外光谱对改性产物结构
进行表征,并对改性后固化膜拉伸强度和断裂伸长率进行分析。结果表明,改性剂甲苯二异氰酸酯与环氧丙烯酸酯
的物质的量比为0.25∶1、反应时间5h、反应温度为75 ℃、复合催化剂(三乙胺和二月桂酸二丁基锡的质量比为
1∶1)加入质量分数为0.1%时,反应转化率最高。红外光谱表明实验得到改性预聚物。

关键词: 环氧丙烯酸酯, 预聚物, 改性