耐暗影水性聚丙烯酸酯乳液压敏胶黏剂的制备

Preparation of shadow-resistant aqueous acrylic emulsion pressure-sensitive adhesive

摘要:

以丙烯酸羟乙酯（HEA）、丙烯酸（AA）、丙烯酸丁酯（BA）作为反应单体，采用半连续种子乳液聚合法合成水性聚丙烯酸酯乳液并制备乳液压敏胶黏剂，通过外加交联剂或真空处理的方法改善乳液压敏胶黏剂的耐暗影性能。基于FTIR、TEM等表征和TGA、粒径、黏度等测试，考察引发剂（过硫酸铵）用量（占反应单体总质量的百分数，下同）、搅拌转速、反应温度和保温时间对聚丙烯酸酯乳液和乳液压敏胶黏剂性能的影响，探究外加交联剂种类和用量（占聚丙烯酸酯乳液质量的百分数，下同）、真空处理时间对乳液压敏胶黏剂性能的影响。结果表明，引发剂用量0.4%、搅拌转速700~800 r/min、反应温度85 ℃、保温时间2 h条件下制备的聚丙烯酸酯乳液（PSA-1乳液）及乳液压敏胶黏剂PSA-1的各项性能较好；以氮丙啶为外加交联剂，其用量为1.0%和1.5%时，乳液压敏胶黏剂的耐暗影性能较为优异；真空处理PSA-1乳液60 min时制备的乳液压敏胶黏剂PSA-1-60同时具备较为优异的粘结性能及耐暗影性能，其初粘力为25#、180°剥离强度为1.85 N/cm，测试镜面板表面无可见暗影。

Abstract:

Hydroxy ethyl acrylate (HEA), acrylic acid (AA), and butyl acrylate (BA) were utilised as monomers in a reaction to produce a water-based polyacrylate emulsion. This emulsion was then employed to create an emulsion pressure-sensitive adhesive using semi-continuous seed emulsion polymerization. The shading resistance of the emulsion pressure-sensitive adhesive was enhanced through the utilisation of a crosslinking agent or by subjecting it to vacuum treatment. The properties of polyacrylate emulsion and emulsion pressure-sensitive adhesive were investigated by analysing the characterization of FTIR, TEM, TGA, particle size, and viscosity. The effects of the amount of initiator (ammonium persulfate), stirring speed, reaction temperature, and holding time on these properties were examined. An investigation was conducted to examine the impact of the kind and quantity of an additional crosslinking agent (expressed as a percentage of the mass of polyacrylate emulsion) and the duration of vacuum treatment on the properties of emulsion pressure-sensitive adhesive. The findings indicated that the characteristics of polyacrylate emulsion (PSA-1 emulsion) and emulsion pressure-sensitive adhesive PSA-1 were enhanced when created with an initiator dosage of 0.4%, stirring speed ranging from 700 to 800 r/min, reaction temperature of 85 ℃, and holding period of 2 hours. The emulsion pressure-sensitive adhesive exhibited improved shadow resistance when the dosage of aziridine was increased to 1.0% and 1.5%. The emulsion pressure-sensitive adhesive PSA-1-60, which is produced by subjecting the PSA-1 emulsion to vacuum treatment for a duration of 60 minutes, exhibits exceptional bonding characteristics and resistance to shadowing. The initial adhesion of the material is 25#, while the peel strength is 1.85 N/cm at 180°. Additionally, there are no visible shadows on the surface of the test mirror plate.