蓖麻油基光敏树脂的合成及其UV-LED固化无影胶的性能

Preparation of Castor Oil-based Photosensitive Resin and Performance of Its UV-LED Shadowless Adhesives

以蓖麻油、异佛尔酮二异氰酸酯、丙烯酸羟乙酯为原料,通过无溶剂法合成的一种蓖麻油基聚氨酯丙烯酸酯(CO-PUA)作为光敏单体。将自制的CO-PUA、活性稀释剂、硅烷偶联剂、附着力促进剂、光引发剂以及四(3-巯基丙酸)季戊四醇酯(PETMP)按比例混合制得一系列UV-LED固化无影胶,并考察了PETMP的添加量对无影胶性能的影响。结果表明:引入PETMP的UV-LED固化无影胶具有巯基-烯“点击化学”的反应特性,消除了氧阻的危害,无影胶固化完全。当PETMP的添加量为0.5 g时,具有最佳黏结性能,以有机玻璃-有机玻璃、有机玻璃-不锈钢、玻璃-不锈钢为搭接基材测得黏结拉伸剪切强度分别为2.44 MPa、5.06 MPa和5.70 MPa。

A castor oil-based polyurethane acrylate(CO-PUA)was synthesized using castor oil,isophorone diisocyanate,and hydroxyethyl acrylate via a solvent-free method,and was used as photosensitive monomers.A series of UV-LED shadowless adhesives were prepared based on the mix of the as-prepared CO-PUA,reactive diluent,silane coupling agent,adhesion promoter,photoinitiator,and pentaerythritol tera(3-mercaptopropionate)(PETMP).The effect of the amount of PETMP on the performance of the shadowless adhesives was investigated.The results showed that the UV-LED curable shadowless adhesives with PETMP exhibited the characteristics of thiol-ene“click chemistry”,which eliminated the harm of oxygen inhibition and shadowless adhesive was cured completely. Especially,when 0. 5 g PETMP was introduced,the tensile shear strength of the samples using PMMA-PMMA, PMMA-stainless steel,and glass-stainless steel as the bonding substrate reached 2. 44 MPa, 5. 06 MPa and 5. 70 MPa,respectively.