RAFT聚合制备水性高颜料分散性油墨乳液

Synthesis of water-based high-pigment dispersion ink emulsion by RAFT polymerization

摘要:

为开发高颜料分散性油墨乳液，以烯丙基羟丙磺酸钠(COPS-1)和丙烯酰胺甲基丙磺酸(AMPS)为原料，通过可逆加成-断裂链转移（RAFT）聚合制得高分子乳化剂，进而制备水性丙烯酸酯油墨乳液。通过FTIR对高分子乳化剂进行结构分析，并对其进行相对分子质量及分布和临界胶束浓度分析。探讨RAFT用量、高分子乳化剂亲水单体比例和亲水单体量等对乳液性能的影响。结果表明：RAFT聚合所制备的高分子乳化剂具有良好的乳化性能，且相对分子质量分布较窄。RAFT试剂（S，S′-二(ɑ，ɑ′-二甲基-ɑ″-乙酸)-三硫代碳酸酯）最佳用量为乳液单体质量的0.6%，亲水单体的最佳比例为m(COPS-1)∶m(AMPS)∶m(丙烯酸)=1∶2∶3，最佳亲水单体量为高分子乳化剂单体质量的25%。通过对乳液的玻璃化转变温度和粒子形貌分析表明，乳胶粒子具备两个玻璃化转变状态，且分散均匀。

Abstract:

In order to develop the high-pigment dispersion ink emulsion, 3-Allyloxy-2-hydroxy-1-propane sulfonic acid salt (COPS-1) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) were used to prepare polymeric emulsifiers and polyacrylate emulsions by Reversible addition fragmentation chain transfer (RAFT) polymerization. The structure and properties of the polymeric emulsifiers were characterized by FT-IR, GPC and critical micelle concentration analysis. The influence of RAFT agent dosage, hydrophilic monomer ratio of polymeric emulsifier, hydrophilic monomer amount on the properties of emulsions and coating films were investigated, which revealed that the polymer emulsifiers prepared by RAFT polymerization have good emulsifying properties and narrow molecular weight distribution. The optimal amount of RAFT reagent is 0.6% of the monomer amount, the optimal ratio of the hydrophilic monomer is m(COPS-1)∶m(AMPS)∶m(AA)=1∶2∶3, and the optimal acid amount is 25%. Analysis of the glass transition temperature and particle morphology of the emulsion shows that the latex particles have two glass transitions and are uniformly dispersed.