聚丙烯酸酯无皂乳液的构建及对水性油墨性能的影响

Preparation of polyacrylate soap-free emulsions and their effect on water-based ink

以丙烯酸(AA)、丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA)、丙烯酸羟丙酯(HPA)、2-甲基丙烯酸羟乙酯(HEMA)、乙烯基三异丙氧基硅烷(A-173)为单体,过氧化苯甲酰(BPO)、过氧化苯甲酸叔丁酯(TBPB)为引发剂,合成了丙烯酸酯大分子乳化剂,再通过无皂乳液聚合法合成了聚丙烯酸酯无皂乳液,将其与颜料等混合制备了水性油墨。采用FTIR、DSC、TEM、SEM对聚合物的结构及性能进行了表征,考察了不同BPO用量对丙烯酸酯大分子乳化剂的影响,不同AA添加量对乳液及水性油墨的影响。结果表明:当BPO用量为单体总质量的4.18%时,丙烯酸酯大分子乳化剂具有最低表面张力40.43mN/m;当AA添加量为单体总质量的1.00%时,聚丙烯酸酯无皂乳液具有合格的储存稳定性,乳胶膜拉伸强度可达5.00 MPa,断裂伸长率为200%,玻璃化转变温度为18.5℃,所制备的水性油墨黏度为23.79mPa·s,附着牢度90.75%,耐摩擦性4.5级。

Acrylate macromolecular emulsifiers were synthesized from monomers of acrylic acid(AA),butyl acrylate(BA),methyl methacrylate(MMA),hydroxypropyl acrylate(HPA),2-hydroxyethyl methacrylate(HEMA),vinyl triisopropoxysilane(A-173),with benzoyl peroxide(BPO)and tert-butyl peroxide(TBPB)as initiators.Polyacrylate soap-free emulsions were then synthesized by soap-free emulsion polymerization,and further mixed with pigments to obtain water-based ink.The structure and properties of polymers obtained were characterized by FTIR,DSC,TEM,SEM.The effect of BPO dosage on acrylate macromolecular emulsifier as well as the influence of AA addition on emulsions and water-based ink were investigated.The results showed that when BPO added was 4.18%of the total mass of all monomers,the acrylate macromolecular emulsifier exhibited the lowest surface tension of 40.43 mN/m.When the AA was 1.00%of the total mass of all monomers,the polyacrylate soap-free emulsion displayed qualified storage stability,with the tensile strength of latex film reaching 5.00 MPa,the elongation at break of 200%,the glass transition temperature of 18.5℃,the viscosity of prepared water-based ink of 23.79 mPa·s,the adhesion fastness of 90.75%,and the friction resistance grade of 4.5.