中国胶粘剂

以丙烯酸异辛酯、丙烯酸丁酯、丙烯酸羟基乙酯、丙烯酸羟基丙酯、GMA(甲基丙烯酸缩水甘油酯)和丙烯酸异冰片酯为共聚单体,BPO(过氧化二苯甲酰)为引发剂,NDM(正十二烷基硫醇)为链转移剂,采用本体聚合、两步法合成工艺(自由基聚合+逐步聚合)制备常温下低黏度、无溶剂的聚丙烯酸酯压敏胶,分别探讨了链转移剂正十二烷基硫醇含量、催化剂选择、功能单体ACMO(丙烯酰吗啉)加入量、胶层厚度和光引发剂配比对压敏胶性能的影响,以及压敏胶的耐高温性能。研究结果表明:当w(NDM)=1%、w(ACMO)=8%(相对预聚物总量而言)、催化剂选择对甲苯磺酸、胶层厚度为50μm时,压敏胶的环形初粘力达到30 N·(25 mm)^-1,180°剥离强度为32 N·(25 mm)^-1,持粘时间>72 h。而且压敏胶有较好耐高温性,经历150℃、12 h的放置后,压敏胶180°剥离强度和持粘时间没有下降。

Using isooctyl acrylate,butyl acrylate,hydroxyethyl acrylate,hydroxypropyl acrylate,GMA(glycidyl methacrylate)and isobornyl acrylate as copolymers,BPO(dibenzoyl peroxide)as initiator,NDM(ndodecyl mercaptan)as chain transfer agent,the synthesis process(free radical polymerization + step-by-step polymerization)was carried out by bulk polymerization and two-steps synthesis to produce low viscosity,solventfree polyacrylate pressure-sensitive adhesive at normal temperature. The effects of chain transfer agent n-dodecyl mercaptan content,catalyst selection,functional monomer ACMO(acryloylmorpholine),adhesive thickness and photoinitiator ratio on the properties of pressure sensitive adhesive,as well as the high temperature resistance of pressure sensitive adhesive were discussed. The research results showed that when w(NDM)=1%,w(ACMO)=8%(relative to the total prepolymer quality),p-toluene sulfonic acid as catalyst and 50 μm thickness of the adhesive layer were selected,the initial loop tack of pressure sensitive adhesive reached 30 N·(25 mm)^-1,the peeling strength at 180° was 32 N·(25 mm)^-1,and the holding time was more than 72 h. Moreover,PSA had good high temperature resistance. After being placed at 150 ℃ for 12 h,the peeling strength at 180° and holding time of PSA did not decrease.