Abstract: 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 adhesiveswas investigated. The results showed that the UV-LED curable shadowless adhesives withPETMP 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.

Key words: UV-LED cured, shadowless adhesives, polyurethane acrylate, castor oil, thiol-ene

摘要： 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。

关键词: UV-LED固化, 无影胶, 聚氨酯丙烯酸酯, 蓖麻油, 巯基-烯

CLC Number: 

• TQ630. 4+ 3