三元两亲共聚物作乳化剂制备核壳型改性酪素皮革涂饰剂

Synthesis of Core-shell Structural Modified Casein Leather Finishing Agent Based on a Ternary Amphiphilic Polymer

采用无皂乳液聚合法同时引入三元两亲共聚物作乳化剂,合成具有核壳结构的聚丙烯酸酯改性酪素皮革涂饰剂,考察了乳化剂的加入方式及其用量对乳液性能(稀释稳定性、耐酸性、耐碱性等)及成膜性能(耐水性、机械力学性能)的影响,并分别通过红外光谱(FT-IR)、透射电镜(TEM)和动态激光光散射(DLS),对乳液结构、形貌和粒径大小进行表征。结果表明:当三元两亲性共聚物在单体后加入,用量为4%时,制备的皮革涂饰剂性能最优。与未采用三元两亲共聚物做乳化剂制备的乳液相比,采用本方法所制备的乳液成膜耐水性、抗张强度和断裂伸长率均有所提高。FT-IR谱图显示三元两亲共聚物成功接枝到聚合物中,TEM和DLS结果显示所制备的乳胶粒具有明显的核壳结构,粒径约为40～50nm,且分布均匀。

Modified casein leather finishing agents with core - shell structure prepared via emulsifier - free emulsion polymeri- zation were studied, using a ternary amphiphili tier on the properties of the emulsion （ diluting c polymer as the emulsifier. Effects of adding method and the amount of the emulsi- stability, acid resistance, alkali resistance） and film properties （water resistance, mechanical properties） were investigated. Latex structure, morphology and particle size were characterized by Infrared Spectrosco- py （ FT - IR） , Transmission Electron Microscopy （ TEM ） and Dynamic Laser Light Scattering （ DLS）, respectively. The best properties of modified casein is obtained when the emulsifier is added after the monomers with the amount 4%. Compared with those of control system（without emulsifiers）, water resistance, tensile strength and breaking elongation of films formed by modi- fied casein based on ternary amphiphilic polymer are increased. The results of FT - IR suggest that ternary amphiphilic polymer successfully graft on modified casein polymer. TEM and DIS show that particles size of modified casein based on ternary am- phiphilic polymer are about 40 - 50 nm with obvious core - shell structure and uniform distribution.