阳离子型水基疏水涂料的制备及性能  

Preparation and Properties of Aqueous Cationic Hydrophobic Coatings

作　　者：刘佳 李坚 任强 汪称意 Jia Liu;Jian Li;Qiang Ren;Chengyi Wang(Jiangsu Key Laboratory of Environmental Friendly Polymer Materials,Department of Materials Chemistry,Faculty of Materials Scienceand Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]江苏省环境友好高分子材料重点实验室常州大学材料科学与工程学院材料化学系

出　　处：《高分子材料科学与工程》2019年第11期8-16,共9页Polymer Materials Science & Engineering

摘　　要：通过可逆加成-断裂链转移聚合(RAFT)合成了聚(丙烯酸二甲氨基乙酯-co-苯乙烯)-b-聚丙烯酸六氟丁酯嵌段共聚物(P(DMAEA-co-St)-b-PHFBA),并以此制备了阳离子型水基疏水涂料。通过凝胶渗透色谱、核磁共振氢谱、接触角等对P(DMAEA-co-St)-b-PHFBA结构及性能进行了研究,探讨了分散介质、烘干温度、纳米二氧化硅粒径及用量对涂料接触角的影响;最后研究了涂料漆膜性能。结果表明,通过RAFT聚合法成功合成了P(DMAEA-co-St)-b-PHFBA,经酸化后,可得阳离子水分散体,薄膜对水接触角为103°。将P(DMAEA-co-St)-b-PHFBA与粒径200 nm的SiO2以质量比1/1混合后,接触角可达153°(8μL)。将上述疏水纳米颗粒与乙烯-醋酸乙烯共聚物乳液(VAE)混合后,可得综合性能优异的阳离子疏水涂料。当P(DMAEA-co-St)-b-PHFBA/SiO2复合物与VAE质量比为1/1时,接触角为133°(8μL),铅笔硬度为HB,附着力为1级,耐冲击性能为50 cm。Poly(dimethylaminoethyl acrylate-co-styrene)-b-polyhexafluorobutyl acrylate block copolymer(P(DMAEA-co-St)-b-PHFBA) was synthesized by reversible addition-fragmentation chain transfer radical polymerization(RAFT). And an aqueous cationic hydrophobic coating was prepared using this block copolymer. The structure and properties of P(DMAEA-co-St)-b-PHFBA were investigated by gel permeation chromatography(GPC), nuclear magnetic resonance(1H-NMR) and contact angle(WCA). The effects of dispersion medium, dry temperature, particle sizes and amounts of nano-silicon dioxide on contact angles of hydrophobic coatings were studied. Finally, the performances of aqueous cationic hydrophobic coatings were studied. The results show that P(DMAEA-co-St)-b-PHFBA block copolymers were successfully synthesized by RAFT. After acidification, the copolymer could be well-dispersed in water, and the contact angle of the coating to water could reach 103°. When P(DMAEA-co-St)-b-PHFBA was mixed with 200 nm SiO2 at a mass ratio of 1/1, the contact angle of the coating could be increased to 153° measured by 8 μL water droplet, but the performance of the coating is poor. The performance of the coating can be greatly improved by introducing ethylene-vinyl acetate copolymer(VAE) emulsion into the aqueous cationic hydrophobic coating. When the mass ratio of P(DMAEA-co-St)-b-PHFBA/SiO2 to VAE emulsion is 1/1, the contact angle of the coating reaches 133° measured by the water droplet of 8 μL. And the coatings with the pencil hardness of HB, the adhesion level of 1 grade, and the impact strength of 50 cm can be obtained.

关 键 词：含氟嵌段共聚物 阳离子水性涂料 可逆加成-断裂链转移自由基聚合 疏水涂料 接触角 

分 类 号：TQ316.61[化学工程—高聚物工业]