阳离子酪素乳液的合成及其性能研究

Study on synthesis and properties of cationic casein emulsion

以天然产物酪素(CA)为基材,通过自由基聚合在酪素体系中引入阳离子单体一甲基丙烯酸二甲氨基乙酯(DMAEMA),获得了结构稳定、性能优异的阳离子酪素乳液.采用红外光谱(FT-IR)和动态光散射粒度仪(DLS)和最低成膜温度测试仪等对乳液的结构和性能进行了表征,通过菌落定量计数法对阳离子酪素的抗菌性进行了考察,并对其涂饰革样的综合性能进行考察.结果显示:阳离子单体已成功接枝到酪素的链段上;当酪素与阳离子单体质量比为1∶1.5时,可获得电位为正,平均粒径为214.2nm的乳液;阳离子酪素乳液最低成膜温度为23.8℃;采用阳离子酪素涂饰革样后,皮革的耐干湿擦性和柔软度得到了提高;并且与纯酪素相比,阳离子酪素对金黄色葡萄球菌具有良好的抗菌效果,其抑菌率约为80%.

Using natural product casein as the matrix and methyl acrylic acid dimethyl aminoethyl methacrylate （DMAEMA） as the functional cationic monomer, cationic casein-based e-mulsion with stable structure and excellent performance was synthesized by free radical poly-merization .The structure and performance of emulsion were characterized by infrared spec-troscopy （FT-IR） and dynamic light scattering particle size analyzer （DLS） and minimum tilm forming temperature tester and so on. The antibacterial property of emulsion was also investigated by colony-counting methods. The comprehensive performance of leather coating with cationic casein was also observed . Results showed that the cationic monomer had beensuccessfully grafted onto casein chain. When the mass ratio of casein and cationic monomer was 1 ： 1. 5 , latex particles were approximately 214. 2 nm in size, ζ-potential was positive, minimum film-forming temperature was 23. 8℃ . The dry and wet rubbing fastness and sof- ness of leather had been significantly improved when adding cationic casein into gent. Moreover, cationic casein emulsion had higher antibiotic resistance against staphylococ-cus aureus than that of pure casein,of which antibacterial rate was approximately 80%.