丙烯酸酯PSA环形初粘力影响因素研究

以反应型乳化剂(DNS-86)/阴离子型乳化剂(2A1)为复合乳化剂、甲基丙烯酸(MAA)与甲基丙烯酸羟乙酯(HEMA)为极性单体和正十二硫醇为链转移剂时,采用单体预乳化法和半连续乳液聚合法制备丙烯酸酯PSA(压敏胶)乳液。考察了PSA胶带的基材、干胶厚度、烘干条件、复合乳化剂、极性单体和链转移剂等对环形初粘力的影响。结果表明:当基材为白色BOPP(双向拉伸聚丙烯)薄膜、干胶厚度为50μm、烘干时间为3 min、烘干温度为110~115℃、w(正十二硫醇)=0.09%、同时引入MAA和HEMA极性单体、w(复合乳化剂)=1.5%和m(2A1)∶m(DNS-86)=2∶1时,相应丙烯酸酯PSA乳液的环形初粘力相对最大(14.73 N/25 mm)。

Study on influences factors for loop tack of acrylate PSA

With reactive emulsifier(DNS-86)/anion emulsifier(2A1) as composite emulsifier,methacrylic acid(MAA) and hydroxyethyl methacrylate(HEMA) as polar monomers,and n-dodecanethiol as chain transfer agent,an acrylate PSA(pressure sensitive adhesive) emulsion was made by monomer pre-emulsification and semi-continuous emulsion polymerization methods.The influences of some factors such as base material of PSA tape,thickness of dry PSA coat,drying conditions,composite emulsifier,polar monomer and chain transfer agent were investigated on loop tack.The results showed that the corresponding acrylate PSA had reversely maximal loop tack(14.73 N/25 mm) when base material was white BOPP(biaxial oriented polypropylene) film,thickness of dry PSA coat was 50 μm,drying time and temperature were 3 min and 110-115 ℃ respectively,mass fraction of n-dodecanethiol was 0.09%,MAA and HEMA polar monomers were introduced into system,mass fraction of composite emulsifier was 1.5% and mass ratio of m(2A1)∶m(DNS-86) was 2∶1.