电子束/潮气双重固化有机硅改性酚醛环氧丙烯酸酯的固化行为

Curing Behavior of Organosilicon-Modified Phenolic-Epoxy Acrylate Resin under Curing Condition Involving Electron Beam Irradiation and Moisture Atmosphere

漆膜双重固化效果好,而目前电子束/潮气双重固化树脂体系的研究还不系统。将硅氧烷基团引入酚醛环氧丙烯酚酯中,制备了一种可电子束/潮气双重固化的树脂,采用摆杆硬度法研究了树脂配方、电子束辐照剂量以及潮气固化温度对固化效果的影响,并采用红外光谱、热重分析对漆膜固化前后的分子结构及热稳定性进行表征。结果表明:漆膜在潮气固化过程中内部的S-OC2H5基团通过水解缩合生成Si-O-Si交联网络结构;电子束辐照剂量及树脂双键含量的增加会延长潮气固化时间,而潮气固化温度升高则可大幅度缩短潮气固化时间,同时漆膜经潮气固化后其物理性能和热稳定性能都得到了显著提升。

Siloxane group was incorporated into the molecular chain of phenolic-epoxy acrylate to afford a composite resin that could be cured under the curing condition involving both electron beam irradiation and moisture atmosphere.The effect of resin formula,electron beam irradiation dosage,and temperature of moisture on the curing process of the resin was investigated by pendulum hardness method.Moreover,the molecular structure of as-prepared resin before and after curing was analyzed by means of infrared spectrometry,and the thermal stability of the resin was examined by thermogravimetric analysis.Results indicated that,during the curing process in moisture atmosphere,the Si-OC2H5 group of as-prepared resin was hydrolyzed and condensed to generate Si-O-Si interlocked network.Increasing electron beam irradiation dosage and content of double bond in as-prepared resin led to increased curing time in moisture atmosphere,while elevating temperature of the moisture atmosphere greatly reduced the curing time of the resin in moisture atmosphere.In the meantime,the coating made of the resin cured in moisture atmosphere possessed greatly improved physical properties and thermal stability.