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通过丙烯酸改性聚醋酸乙烯乳液,得到适用于高速粘结设备的乳液。采用种子乳液聚合合成工艺,合成聚醋酸乙烯核结构,再将丙烯酸和醋酸乙烯单体接枝到核结构上,形成壳结构,对聚醋酸乙烯进行改性,降低了乳液的最低成膜温度,提高了乳液的粘度,合成了一种新型的白乳胶。对单体的滴加速度、壳结构单体的配料比例、引发剂的加入方式及加入量、保护胶体的种类和用量等因素对乳液性能的影响进行了研究。实验结果表明,当m(AA)∶m(VAC)=3∶10,AA 0.73%(质量分数,下同);引发剂用量0.3%;PVA1788∶PVA1799=1∶2为配方比例,可以得到满足生产需要的乳液;在合成工艺上,采取引发剂加入方式为分步补加,改性单体通过核壳结构对聚醋酸乙烯进行改性。通过配方和合成工艺的研究,本实验得到了能够适用于高速粘结设备的乳液产品。
Acrylic modified polyvinyl acetate emulsion to obtain suitable for high-speed bonding equipment emulsion. Using seed emulsion polymerization synthetic process, the synthesis of polyvinyl acetate core structure, and then acrylic acid and vinyl acetate monomer grafted to the core structure, forming a shell structure, modified polyvinyl acetate, reducing the minimum film forming temperature of the emulsion, Improve the viscosity of the emulsion and synthesize a new kind of white latex. The effects of the dropping rate of monomers, the proportion of shell structure monomers, the adding method and amount of initiator, the type and amount of protective colloid on the properties of emulsion were studied. The experimental results show that when m (AA): m (VAC) = 3:10, AA 0.73% (mass fraction, the same below); initiator dosage 0.3%; PVA1788: PVA1799 = Production of the required emulsion; in the synthesis process, to take initiator added step by step added, the modified monomer through the core-shell structure of polyvinyl acetate modified. Through the study of formulation and synthesis process, we got the emulsion product that can be applied to high speed bonding equipment.