RAFT聚合制备嵌段聚合物对PP基材涂料附着力的改善

Block polymer prepared by RAFT polymerization to improve the adhesion to the PP substrate

合成了RAFT试剂S-1-十二烷基-S’-(α,α’-二甲基-α"-乙酸)三硫代碳酸酯(DDAATB),并以此种RAFT试剂为链转移剂制备聚丙烯酸均聚物,再以此均聚物为大分子链转移剂,制备了聚丙烯酸-b-聚丙烯酸异冰片酯嵌段共聚物(PAA-b-PIBOA)。以制备的丙烯酸酯嵌段共聚物作为附着力促进剂,与UV树脂复配成UV涂料,考察了添加不同质量分数嵌段共聚物的涂料对PP基材的附着能力的改善,并与CPP进行了比较。研究结果表明,制备的丙烯酸酯嵌段共聚物可有效提高涂层对PP基材的粘附性,PIBOA链段分子量越大,效果越明显;将制备的PAA-b-PIBOA为附着力促进剂,分别添加至以聚酯丙烯酸酯、氯化聚醚为主体树脂的涂料配方中,通过附着力性能测试,发现合成的嵌段共聚物PAA-b-PIBOA能有效提高涂层对PP基材的附着力。

In this paper,a kind of RAFT agent named S-1-Dodecyl-S’-（a,a’-dimethyl-a”- acetic acid）-trithiocar-bonate （DDAATB）were synthesized.Polyacrylic acid is prepared by using the RAFT agent as a chain transfer agent,then use the polyacrylic acid as the macro-RAFT agent to prepare the block copolymer （PAA-b-PIBOA）. Using this block copolymer as the adhesion promoter,it was added into the coatings formula with addition of different contents.Then the complex was separately painted to the PP substrate and cured.The peel strength of the coating was measured,and compared with CPP was made.The results showed that the prepared acrylate block copolymer can effectively improve the adhesion to the PP substrate.The greater the molecular weight of PIBOA segment,the more obviously of the adhesion effect.Meanwhile,PAA-b-PIBOA was added to the coat-ing formulation of polyester acrylate and chlorinated polyether resin,it could effectively be to improve the coat-ing adhesion on PP substrate.