UV固化丙烯酸酯胶粘剂的合成及性能研究

Study on synthesis and properties of UV-curable acrylate adhesive

以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、甲基丙烯酸缩水甘油酯(GMA)和丙烯酸羟乙酯(HEA)为共聚单体,并以二缩三丙二醇二丙烯酸酯(TPGDA)为交联剂、十二烷基硫醇(NDM)为链转移剂和乙酸乙酯为极性溶剂,采用核/壳溶液聚合法合成了侧链含C=C的丙烯酸酯预聚体;然后以此为基体树脂、丙烯酸异冰片酯(IBOA)和三羟甲基丙烷二丙烯酸酯(TMPTA)为活性稀释剂、651为自由基光引发剂和碘鎓盐为阳离子光引发剂,制备了UV固化胶粘剂。研究结果表明:合成丙烯酸酯预聚体的最佳工艺条件是m(BA)∶m(MMA)∶m(GMA)∶m(TPGDA)∶m(HEA)=20∶60∶10∶4∶6、n(TPGDA)∶n(NDM)=2∶2、w(热引发剂)=3%和w(乙酸乙酯)≥70%(均相对于共聚单体总质量而言);自由基/阳离子混杂双重UV固化胶粘剂比单一自由基UV固化胶粘剂具有更大的附着力和耐酸碱性,此时前者的最佳配方中w(预聚体)=55%、w(651或碘鎓盐)=5%、w(IBOA)=15%、w(TMPTA)=12%和w(GMA)=8%(均相对于胶粘剂总物料质量而言)。

With methyl methacrylate （MMA）, butyl acrylate （BA）, glycidyl methacrylate （GMA） and hydroxyethyl acrylate （HEA） as comonomers, and with tripropylene glycol diacrylate （TPGDA） as cross linker, n-dodecyl mercap- tan（NDM） as chain-transfer agent and ethyl acetate as polarity solvent, an acrylate prepolymer with C--C side chain was synthesized by core/shell solution polymerization. Then,with this as matrix resin,651 as free radical photoinitiator, iodonium salt as cationic photoinitiator, isobornyl acrylate （IBOA） and trimethylolpropane diacrylate （TMPTA） as reactive diluent, an UV-curable adhesive was prepared. The research results showed that the optimal process conditions of preparing acrylate prepolymer were preferred when mass ratio of m （BA） ：m （M MA ） ：m （GMA） ：m （TPGDA） ：m （HEA） was 20 ：60 ：10 ：4 ：6 , mass fractions of thermal initiator and ethyl acetate were 3% and not less than 70% in total comonomers respectively, molar ratio of n （TPGDA）：n （NDM） was 2：2. The adhesion and acid-alkali resistance of double UV-curable adhesive with hybrid free radical/cationic were larger than those of single UV-curable adhesive with free radical when mass fractions of prepolymer, 651 or iodonium salt, IBOA, TMPTA and GMA were 55%, 5%, 15%, 12% and 8% respectively in total materiels for adhesive prepared by optimal formula.