纯丙微乳液的合成与表征

采用预乳化半连续滴加方法，用甲基丙烯酸甲酯、丙烯酸丁酯、甲基丙烯酸，合成了纯丙微乳液，确定了最佳配方。探讨了软硬单体配比、乳化剂用量以及阴／非离子乳化剂配比、pH值以及聚合工艺中反应温度、反应时间对纯丙微乳液聚合稳定性、乳液性能及外观的影响。结果表明，当硬软单体的配比为5：4、乳化剂的配比为4：1、乳化剂的用量为3％、引发剂的用量为0．5％、pH在7—8、反应温度为80～88℃、反应时间为150min时，微乳液的性能最好。并对共聚物的结构和微乳液涂膜应用傅立叶红外光谱（FTIR）进行表征，测试结果表明丙烯酸酯类单体之间发生了自由基共聚反应。

Preparation and Characterization of Pure Acrylic Microemulsion

The synthesis of pure acrylic microemulsion was prepared by semi-continuous seeded emulsion polymerization, adopting methyl methacrylate, butyl acylate and adding a little methacrylic acid. Then the best formulas were made out. The effects of the ratio of soft and hard monomer, the ratio and the lever of emulsifiers, pH value and polymerization temperature, reaction time in the system on the stability of emulsion polymerization, properties and appearance of latex were discussed. The results showed that when the ratio of hard and soft monomer was 5：4, the ratio of emulsifiers was 4：1, emulsion was 3%, initiatator was 0. 5%, pH value was around 7 - 8, polymerization temperature was 80- 88℃, reaction time was 150min, the properties of pure acrylic emulsion and films are the best. The analyzed results of Fourier Transform Infrared Spectroscopy （FTIR） show that the radical copolymerization has happened amon; the monomers.