可见光固化天然胶乳压敏胶的研制

采用可见光引发体系固化将降解天然胶乳与萜烯树脂乳液的其他助剂组合制备水乳型压敏胶,研究在一定光照强度下,降解天然胶乳与萜烯树脂乳液的不同配比,天然胶乳不同分子量,其他助剂的用量对压敏胶性能的影响。结果表明,降解天然胶乳与萜烯树脂乳液质量比为1∶1、降解天然胶乳分子量为19.8×10^4、引发剂1.2%、交联剂15%、促进剂0.4%时压敏胶性能最优。DSC和TG/DTG表明含有光引发剂的压敏胶在光照后热稳定性提高,压敏胶的Tg升高了5℃,仍具有很低的使用温度。

Preparation of Pressure Sensitive Adhesives Based on Visible Light-Cured Natural Rubber Latex

Degraded natural latex was mixed with terpene resin emulsion and other additives and then cured under the visible light initiator system to prepare oil-in-water emulsion type of pressure-sensitive adhesive (PSA). The ratio of degraded natural rubber to terpene resin emulsion,molecular weight and amounts of other additives were measured to observe their effects on the properties of PSA under a given light intensity. The results showed that the PSA with optimum properties was prepared under the following conditions: the ratio of the degraded natural latex and terpene resin emulsion was 1:1,molecular weight of the degraded natural rubber latex 19.8×10~4,the amount of initiator 1.2%,the amount of cross-linker 15%,and the amount of accelerant 0.4%. The DSC and TG/DTG showed that the PSA was improved in thermal stability after the PSA containing photo-initiator was cured by visible light. The PSA containing photo-initiator showed an increase of 5℃ in Tg,and was still available under a very low temperature.