碱溶性丙烯酸酯乳液啤酒贴标胶的合成及性能研究

Study on synthesis and properties of alkali-solubility acrylate emulsion for beer labeling adhesive

以BA(丙烯酸丁酯)和EA(丙烯酸乙酯)为软单体、MMA(甲基丙烯酸甲酯)为硬单体、混合羧基单体MAA(甲基丙烯酸)和AA(丙烯酸)为功能单体、十二烷基硫酸钠(SDS)/辛基酚聚氧乙烯醚(OP-10)为阴/非离子型复合乳化剂、过硫酸钾(KPS)和亚硫酸氢钠(Na HSO3)为引发剂,采用种子乳液聚合法合成了碱溶性丙烯酸酯乳液。研究结果表明:当m(软单体)∶m(硬单体)=2∶1、m(AA)∶m(MAA)=0∶1且w(—COOH)=7%(相对于单体总质量而言)时,乳液的Tg(玻璃化转变温度)为25.5℃、碱脱时间为11 min、耐水性(吸水率26.91%)相对最好、单体转化率(95.87%)和固含量(47.12%)相对最大,说明该乳液在热碱性条件下易脱胶且耐水性较强,完全满足啤酒贴标胶的使用要求。

With BA （butyl acrylate） and EA （ethyl acrylate） as soft monomers, MMA （methyl methacrylate） as hard monomer, mixed earboxylic monomers such as MAA （methaerylic acid） and AA （acrylic acid） as functional monomers, sodium dodecyl sulfate（SDS）/octyl phenol polyoxyethylene ether（OP-10） as anionic/nonionie compound emulsifier, potassium persulfate （KPS） and sodium bisulfite （NaHSO3） as initiators, an alkali-solubility acrylate emulsion was synthesized by seed emulsion polymerization. The research resuhs showed that the emulsion had the easy degumming under a hot alkaline conditions and the better water resistance, and could completely meet the application requirement of beer labeling adhesive because its Tg（glass transition temperature） was 25.5℃, alkali- degumming time was 11 min, water resistance （water absorption at 26.91%） was relatively best, monomer conversion rate （95.87%） and solid content （47.12% ） were relatively maximal when mass ratios of m （soft monomer） ：m （hard monomer） and m（AA） ：m（MAA） were 2：1 and 0：1 respectively, and mass fraction of-COOH was 7% in total monomers.