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分别采用丙烯酸丁酯和苯乙烯作为软硬单体,NP和DBS的混合乳化剂作为乳化体系,采用过硫酸钾作为引发剂,并引入功能性单体甲基丙烯酸,用半连续种子乳液聚合工艺来制备苯丙乳液.在聚合过程中改变加入的乳化剂量.研究了乳化剂对苯丙乳液的平均粒径、稳定性、吸水率、粘度和流变性等性质的影响.研究结果表明随着乳化剂用量的增大,乳液胶粒的平均粒径减小,而乳液的粘度和胶膜的吸水率却增大.乳液的稳定性受乳化剂中非离子乳化剂和阴离子乳化剂的质量配比影响较大,而乳液的流变性则与乳化剂的浓度无关.并对乳化剂对乳液性质的影响原因进行解释和分析.因此,在制备不同用途的苯丙乳液时,必须要严格控制乳化剂的浓度及配比.
Respectively, using butyl acrylate and styrene as soft and hard monomer, NP and DBS as emulsifier emulsification system, potassium persulfate as initiator, and the introduction of functional monomer methacrylic acid, semi-continuous seed emulsion polymerization process To prepare the styrene-acrylic emulsion.The amount of the emulsifier added was changed during the polymerization.The effects of the emulsifier on the properties such as the average particle diameter, the stability, the water absorption, the viscosity and the rheology of the styrene-acrylic emulsion were studied.The results show that with the emulsification The dosage of the emulsion increases, the average particle size of the emulsion particles decreases, but the viscosity of the emulsion and the water absorption of the film increases. The emulsion stability is affected by the mass ratio of the nonionic emulsifier to the anionic emulsifier in the emulsifier But the rheology of the emulsion has nothing to do with the concentration of the emulsifier.And explain and analyze the reason of the emulsifier on the properties of the emulsion.Therefore, in the preparation of different uses of styrene-acrylic emulsion, we must strictly control the emulsifier The concentration and ratio.