A kind of nano-silica sol modified exterior wall latex paint and preparation method thereof

Abstract

The invention relates to a nanometer silica sol modified exterior wall emulsion paint. The emulsion paint comprises, by mass, 10-30% of water, 15-30% of an emulsion, 5-10% of a nanometer silica sol, 5-15% of heavy calcium, 1-3% of talc, 0.5-1.5% of propylene glycol, 5-25% of titanium dioxide, 0.05-2% of a wetting agent, 0.5-1% of an antifoaming agent, 0.1-0.5% of a dispersant, 1-2% of a thickening agent, and 0.5-2% of a film forming assistant. The preparation method comprises the following steps: dispersion grinding: adding water, powders and early assistants to a dispenser, grinding, and filtering; and post-treating: adding the emulsion, the nanometer silica sol, later water and later assistants to a dispersed slurry, and adjusting the PH value and the viscosity to prepare the emulsion paint. According to the invention, the exterior wall emulsion paint, which is prepared by completing simple technologies of dispersing, sand milling, filtering and the like, has the advantages of no pollution, low VOC (volatile organic compound) discharge, environmental protection, strong adhesion, and good storage stability, washing resistance, contamination resistance and weather resistance.

Description

technical field [0001] The invention relates to an exterior wall latex paint and a preparation method thereof, in particular to a nano-silica sol modified exterior wall latex paint with good adhesion and weather resistance and a preparation method thereof. technical background [0002] At present, there are many types of latex paints for exterior walls in the market, which generally have the characteristics of high strength, low pollution, and good film-forming properties, but there are also many problems. If there is a lack of toughness and adhesion, peeling and cracks will appear on the wall painted with ordinary exterior paint after one year. Poor erosion resistance, severe discoloration, poor oil stain resistance, especially poor weather resistance, prone to cracking in warm and cold climates. [0003] Silica sol has high activity and can react with certain salts of the substrate to form a silicate polymer compound and harden to form a film; fine particles can penetrate...

AI Technical Summary

Problems solved by technology

[0006] The main problem to be solved by the invention is that the exterior wall latex paint has poor adhesion and weather resistance, and is susceptible to cracking and aging caused by climate change.

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