乳液聚合包覆铝颜料的制备和表征.pdf

Preparation of Encapsulated Aluminum Pigments by Emulsion Polymerization and Their Characterization Th, Batzilla and A, Tulke--Akzo Nobel Central Research* INTRODUCTION luminum flakes are a selected class of pigments A,, ~,,,,s,o,, polymerization like process tbr the in coatings, 1 which are used in basecoats to A achieve a certain metallic appearance in combi e~zcapsulation qf commercia] a]untim#tt pigmeJ~ts nation with an angle-dependent color change, the so- called flop-effect. To achieve this desired effect, the with polymer is discussed. A possible application flat, metallic flakes have to be oriented parallel to the target is the itul~rovevue~ztqf tile p~formance qf substrate surface. This orientation can be achieved bv an appropriate theology profile and strong film shrinlage ahttttinuttt pigmevzt in waterborwe coatings. T]pe /solvent evaporation) during application and drying. eflfect qf the treatment on the stability qf the atu Due to these rheology and shrinking requirements, solventborne basecoats contain the highest amount of tttinl#tt 13igttlents in the presence qf alkaline wa- solvent compared to other automotive coating layers. ter was examined. Analytical investigations with Stricter legislation and increasing environmental con SEM, TEM, STEMEDX, XPS, amt TOC were sciousness have forced paint producers to develop basecoat formulations with a low volatile organic con- pertbrmed and revealed a kind qfl coagulation tent IV9 This led to the development of waterborne ntechanism qf potytner particles on the pigtuent basecoats. Finely dispersed, un