水性紫外光固化体系中光固化速度的影响因素

Effects on the curing rate of ultraviolet-curable waterborne system

以甲苯 2 ,4 二异氰酸酯、聚己二酸丁二醇酯二醇、二羟甲基丙酸、丙烯酸 β 羟乙酯为原料合成了光敏性树脂。经三乙胺中和后可以得到稳定的自乳化体系。考察了光引发剂种类、用量、干燥条件、中和度、中和剂种类及结构对光固化速度的影响。结果表明 ,本体系优选光引发剂Irgacure10 0 0的质量分数为 3 %时固化速度最快 ;干燥条件对光固化速度有很大的影响 ;随着中和度的提高 ,固化速度下降 ;用NaOH作为中和剂时 ,后期固化速度快于用三乙胺 ;聚合物结构对固化速度有一定的影响 ,随着PBA/DMPA和HEA/DMPA比例的提高 ,固化速度加快。

An ultraviolet curable resin was prepared from toluene diisocyanate, polybutylene adipate glycol, dimethylol propionic acid and β hydroxyethyl acrylate. A stable self emulsified system was obtained after neutralization of triethyl amine. The effects of neutralization degree, drying condition, the type and concentration of photoinitiator, neutralization agent type and structure of prepolymers on the curing rate were discussed. The results show that Irgacure1000 is preferable in the system and the rate is the highest when the amount of Irgacure1000 is 3%; the drying condition has a considerable impact on the rate; it decreases with the increase in neutralization degree; when NaOH is used as neutralization agent, the rate at the later period is higher than that when triethyl amine used; the structure of polymer has a certain effect on the rate and it accelerates with the increase in the ratio of PBA/DMPA and HEA/DMPA.