含氟丙烯酸酯共聚物乳液的制备与性能研究

Preparation and Performance of Fluorinated Acrylate Copolymer Emulsion

目的确定含氟丙烯酸酯共聚物乳液的最佳配方,研究其涂膜表面的疏水疏油性、热力学稳定性等性能。方法以甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、丙烯酸(AA)为原料,丙烯酸十三氟辛酯(PFOA)为含氟单体,过硫酸铵(APS)为引发剂,烷基酚聚氧乙烯醚(OP-10)和十二烷基磺酸钠(SDS)为复合乳化剂,去离子水为分散介质,采用半连续种子乳液聚合法制备核壳型含氟丙烯酸酯共聚物乳液。通过CA,FTIR,DSC,TG和AFM等仪器,对共聚物涂膜的疏水疏油性能、热力学性能及表面化学成分进行表征。结果当乳化剂(OP-10与SDS的质量比为2∶1)的质量分数为3%、引发剂(APS)的质量分数为0.6%、丙烯酸十三氟辛酯(PFOA)的质量分数为9%时,单体转化率最高、凝胶率最低,涂膜对水和十六烷的接触角分别为114°和85°。结论合成的乳液具有良好的疏水疏油性和热力学稳定性等性能,适合油墨罐内壁涂料等产品。

Objective To identify the best formula of fluorinated acrylate copolymer emulsion, and investigate the performance parameters such as hydro-oleophobic and thermodynamic properties. Methods A series of fluorinated acrylate copolymer latex with core–shell structure were synthesized by semi-continuous seeded emulsion polymerization method using methyl methacrylate（MMA）, butyl acrylate（BA）and acrylic acid（AA）as the raw material, PFOA as the fluorinated acrylate monomer, ammonium persulfate（APS） as the initiator, sodium dodecyl sulfate（SDS） and polyoxyethylene octyl phenyl ether（OP-10）as the complex emulsifier and taking water as the dispersion medium. The hydro-oleophobic and thermodynamic properties as well as the surface chemical components were characterized by contact angle goniometer（CA）, fourier transform infrared（FTIR） spectroscopy, differential scanning calorimetry（DSC）,thermogravimetry analysis（TG） and atomic force microscopy（AFM）, respectively. Results The results showed that when the dosage of emulsifier was 3%, the initiator content was 0.6%, and the mass fraction offluorinated monomer was9%, the monomer conversion was the highest and the gel rate was the lowest, while the water contact angle and hexadecane contact angle reached 104° and 71°, respectively. Conclusion The emulsion shows good performance including hydro-oleophobic and thermodynamic properties, and is therefore suitable as inner wall coating of the ink tank and other products.