活性稀释单体对UV固化压敏胶性能的影响

Effect of Reactive Diluents on the Performance of UV-curable Pressure-sensitive Adhesives

作为UV固化压敏胶的重要组成部分,活性稀释单体对压敏胶性能有重要影响。选用7种具有代表性的单官能度活性稀释单体,通过研究其对压敏胶固化过程、玻璃化转变温度、流变性能和黏合强度的影响,系统探究了单体结构对压敏胶性能的影响。结果表明:丙烯酸羟乙酯(HEA)、丙烯酸异冰片酯(IBOA)可以提高压敏胶玻璃化转变温度和内聚强度,适量添加时可提高压敏胶的黏合强度;丙烯酸-2-乙基己酯(2-EHA)、丙烯酸月桂酯(LA)、丙烯酸苄酯(BZA)、四氢化糠基丙烯酸酯(THFA)、乙氧基乙氧基乙基丙烯酸酯(EOEOEA)等单体的添加会降低压敏胶玻璃化转变温度和内聚强度,从而导致压敏胶黏合强度出现不同程度的下降。此外,HEA有助于UV固化压敏胶耐热性的提高,添加HEA的UV固化压敏胶可将对照组的耐高温温度从100℃提高至120℃。

As an important component of UV-curable pressure-sensitive adhesives(PSA),reactive diluents had a significant impact on the performance of PSA.Seven typical monofunctional reactive diluents were selected and their effects on the curing process,glass transition temperature,rheological properties and adhesive strength of PSA were investigated systematically.The results showed that hydroxyethyl acrylate(HEA)and isobornyl acrylate(IBOA)could increase the glass transition temperature and cohesive strength of PSA,as well as the adhesion strength of PSA when added in appropriate amounts;the addition of monomers such as 2-ethylhexyl acrylate(2-EHA),lauryl acrylate(LA),benzyl acrylate(BZA),tetrahydrofurfuryl acrylate(THFA),ethoxyethoxyethyl acrylate(EOEOEA)could reduce the glass transition temperature and cohesive strength of PSA,resulting in a decrease in the adhesion strength of PSA.In addition,HEA contributeed to the high temperature resistance of UV-curable PSA,and UV-curable PSA with the addition of HEA could increase the high temperature resistance of the control group from 100℃to 120℃.