聚丙烯酸酯/铜酞菁蓝复合乳胶膜中颜料颗粒的分散状态

引言功能颗粒存在下,水性胶乳在织物、纸张、皮革等目标基质表面的焙烘成膜是众多生产领域中普遍存在着的一个固化成型过程。通常认为功能颗粒在乳胶膜内初级粒子形式的均匀稳定分散可赋予涂层最佳的功能性和黏结牢度1]。但目前常见的、基

Dispersion of pigment particles in polyacrylate latex film containing phthalocyanine blue

Pigmented latex films were formed from organic pigment phthalocyanine blue and ultrasonic blended latex containing butyl acrylate-styrene copolymer latex(abbreviated as PA+PB)and composite latex prepared via mini-emulsion polymerization(abbreviated as PA/PB)at room temperature respectively and then the films were cured at 120℃.Morphology of pigmented latexes, pigment dispersion in the interior and on the surface of latex films, and color of pigmented latexes were analyzed by DLS, FE-SEM,(Section)-TEM and spectrophotometry.The film formation mechanisms of two kinds of pigmented latexes were studied and compared.It was found that, the binding capacity between pigment and adhesive in blended latex PA+PB were poor.Migration and aggregation of pigment particles would generally occur during film formation, and thus many loose pigment aggregations at micron size could be formed on the surface and in the interior of pigmented latex.In composite latex PA/PB, pigment particles were pre-encapsulated in the interior of quasi-nanoscale adhesive particles.This microcapsule structure led to less obvious effect of pigment particles on film formation.Thus the size of pigment aggregate could be controlled on quasi-nanoscale, and almost all pigment particles could be dispersed in the whole film at the primary particle level.This would give the composite latex PA/PB film better color depth, color fastness and color uniformity.