Novel thickening agent for emulsion architecture coating and preparation method thereof

Abstract

The invention discloses a novel thickening agent for an emulsion architecture coating. The thickening agent comprises the following components in parts by weight: 10-20 parts of polymethyl methacrylate emulsion, 5-15 parts of polyurethane emulsion, 2-10 parts of sodium alginate, 2-8 parts of casein-soybean glue, 1-5 parts of sodium dodecyl benzene sulfonate, 5-8 parts of hydroxyethyl cellulose and 20-50 parts of water. The invention also discloses a method for preparing the thickening agent. The thickening agent provided by the invention is strong in thickening property, good in thixotropy, wide in pH value application range, good in stability, good in thickened coating film-forming property without extinction, free of micro-biological degradation effect, simple in preparation method, easy to operate and low in cost.

Description

Technical field: [0001] The invention relates to the field of paint additives, in particular to a novel emulsion-type thickener for architectural paints. Background technique: [0002] In the preparation of emulsion coatings, additives play a decisive role in the quality of coatings and their construction performance. Thickener is a kind of rheology additive. Adding thickener to emulsion paint can increase the consistency of emulsion paint, slow down the precipitation speed of pigment, and the sediment is loose and easy to stir evenly, so as to ensure the storage stability of paint. Adding some thickeners to latex paints can endow latex paints with thixotropy, which saves labor during the construction of latex paints, reduces sagging, and ensures the appearance and quality of the coatings. [0003] At present, the thickeners that are important to modern emulsion coatings mainly include aqueous cellulose derivatives, polycarboxylates and copolymer emulsions containing functi...

AI Technical Summary

Problems solved by technology

The compatibility of cellulose water-based derivatives and polymers is not very good, which often causes the loss of gloss of emulsion coatings, and it is easily degraded by microorganisms and moldy; polycarboxylate thickeners have obvious thickening effects under alkaline conditions , easy to form a film, has no matting effect on the coating, and is not easily degraded by microorganisms, but its water resistance and alkali resistance are poor, and it is greatly affected by pH; the copolymer emulsion containing functional groups has good thixotropy, which can give the coating good gloss. It is not easy to be decomposed by microorganisms, but its thickening efficiency is affected by various factors such as emulsion, PVC, volume solid content, etc. It is sensitive to surfactants and dispersants, and its viscosity decreases significantly when it is colored