预乳化半连续法聚丙烯酸酯核壳乳液的制备与性能

Synthesis and Properties of Core-Shell Polyacrylic Latex via Pre-Emulsified Semi-Continuous Seeded Emulsion Polymerization

以甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)为主单体,丙烯酸(AA)和丙烯酸羟丙酯(HPMA)为功能性单体,采用预乳化、半连续法种子乳液聚合方法合成了一种硬核软壳聚丙烯酸酯乳液。文中研究了核壳质量比、核和壳中软硬单体BA/MMA质量比对乳液及涂膜性能的影响。通过激光粒度仪、透射电镜、差示扫描量热分析、动态力学分析等手段对乳液粒径及表面形貌、涂膜的玻璃化转变温度、力学性能进行了分析,并对漆膜的硬度、附着力、吸水率等进行了检测,结果表明,核壳质量比为5∶5、核中m(BA)∶m(MMA)为0∶50、壳中m(BA)∶m(MMA)为24∶26时,储存模量可达到3500 MPa,漆膜硬度为2H,附着力为1;乳胶粒有明显的核壳结构,粒径在100 nm左右。

Core-shell structure poly-acrylate latex was synthesized by pre-emulsification and semi-continuous polymerization with methyl methacrylate（ MMA） and butyl acrylate（ BA） as main monomer,acrylic acid（ AA） and hydroxypropyl acrylate（ HPMA） as functional monomer. The influence of core-shell mass ratio,mass ratio of BA and MMA in core and shell on the latex performance and film property of PA dispersion was studied by dynamic thermal mechanical（ DMA）,transmission electron microscopy（ TEM）,differential scanning calorimeter（ DSC） and dynamic light scattering（ DLS）,etc. The results indicate that when the mass ratio of core/shell,BA ∶ MMA in core and shell are 5∶ 5,0∶ 50 and 24∶ 26,respectively,the storage modulus can reach 3500 MPa,film hardness 2 H,adhesion 1 level.The latex particles have obvious core-shell structure and the particle size is about 100 nm.