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采用交联改性的原位聚合封装非溶剂法制备了粒径分布均匀、单分散性良好的中空苯丙聚合物乳胶粒,并采用凝胶率分析、粒径分析仪、黏度计、酸值测量、扫描电镜(SEM)、透射电镜(TEM)、紫外-可见光分光光度计、差示扫描量热分析(DSC)表征考察了壳层中交联单体用量对中空聚合物乳胶粒的合成过程、形态及其干膜遮盖性的影响.结果表明,在其他条件不变的情况下,壳层中交联单体的含量(以其占总单体质量的百分数计,下同)小于15%时,含量越低,壳层强度越低,乳胶粒致孔膨胀时易于塌陷,粒径分布越大;壳层中交联单体含量大于20%时,含量越高,壳层强度越高,乳胶粒尺寸变小,膨胀变得困难;当壳层中交联单体的含量为15%~20%时,粒径分布均匀,壳层强度适中,膨胀性较好,此时含有中空乳胶粒的干膜遮盖性能最好.
The hollow styrene-acrylic polymer latex particles with uniform particle size distribution and good monodispersity were prepared by crosslinking modified in-situ polymerization encapsulation non-solvent method. The gel strength, particle size analyzer, viscometer, acid value The synthesis of hollow polymer latex particles was investigated by means of SEM, SEM, TEM, UV-Vis and DSC. , Morphology and dry film coverage.The results show that under other conditions remain unchanged, the content of crosslinked monomer in the shell (in terms of the percentage of total monomer mass, the same below) is less than 15% , The lower the content is, the lower the shell strength is, the easier the latex particles collapse when the pores are expanded, and the larger the particle size distribution is. When the content of the crosslinking monomer in the shell layer is more than 20%, the higher the shell content, When the content of crosslinking monomer in the shell is 15% ~ 20%, the particle size distribution is uniform, the shell strength is moderate, and the swelling property is good. At this time, the latex particles containing hollow latex particles The best dry film covering performance.