高固含量丙烯酸酯乳液压敏胶制备及性能

以丙烯酸丁酯（BA）、甲基丙烯酸甲酯（MMA）、丙烯酸（AA）、丙烯酸羟乙酯（HEA）为共聚单体，以烯丙氧基脂肪醇聚氧乙烯醚硫酸铵(SR-10)和烷基聚氧乙烯醚琥珀酸单酯磺酸二钠（A-102）作为环保型复合乳化剂，通过无种子半连续乳液聚合工艺制备了固含量高达62%的丙烯酸酯乳液压敏胶。考察了硬单体MMA用量对乳液压敏胶性能的影响。结果表明：当MMA用量为10%（以单体总质量计，下同）时，高固含量丙烯酸酯乳液压敏胶玻璃化转变温度（Tg）为-32.6 ℃，初始热分解温度为337 ℃，水接触角为108°，环形初黏为9.53 N/25mm，180°剥离强度为10.08 N/25mm，持黏力超过72 h；与未添加MMA的高固含量乳液相比，添加10% MMA后乳液黏度从361 mPa·s降至155 mPa·s，粒径从375 nm降至350 nm，粒径分布指数从0.144增至0.214。

Preparation and performance of acrylate emulsion pressure sensitive adhesive with high solid content

The acrylate emulsion pressure sensitive adhesives (PSA) with a solid content of up to 62% were synthesized by unseeded semi-continuous emulsion polymerization technology using butyl acrylate (BA), methyl methacrylate (MMA), acrylic acid (AA) and 2-hydroxyethyl acrylate (HEA) as monomers, allyloxy fatty alcohol polyoxyethylene ether ammonium sulfate (SR-10) and alkyl polyoxyethylene ether succinate monoester disodium sulfonate (A-102) as hybrid emulsifiers. The effects of the amount of hard monomer MMA on the properties of the latex PSAs were investigated. Results indicated that when the amount of MMA accounts for 10% of the total monomer, the glass transition temperature (Tg) is -32.6 °C, the initial thermal decomposition temperature is 337 °C, the water contact angle is 108°, the loop tack is 9.53 N/25mm, the 180° peel strength is 10.08 N/25mm, and the shear holding power is more than 72 h; Compared with the high-solid emulsion without MMA, the viscosity of the emulsion decreased from 361 mPa·s to 155 mPa·s, the particle size decreased from 375 nm to 350 nm, and the particle size distribution index increased from 0.144 to 0.214.