Preparation And Properties Of Waterborne Asphalt Waterproof Coatings And Anticorrosive Coatings

At present,most roofs of buildings use rigid waterproof coatings.Due to the high glass transition temperature of the film-forming resins in these coatings,the high and low temperature resistance and poor elongation of the coatings,the coatings are prone to cracking after the roof is eroded,so this article is selected Elastic acrylic emulsion and emulsified asphalt are blended to prepare a high-performance water-based asphalt waterproof coating;buried metal pipelines traditionally use solvent-based anti-corrosion coatings.Such coatings will pollute the environment and cause harm to human health.A high-performance water-based asphalt anti-corrosion coating.The thesis includes two parts:1.In the first part,four different acrylic emulsions and emulsified asphalt were blended to prepare water-based asphalt waterproof and anti-rust coatings.The effects of the amount of elastic acrylic emulsions and the volume concentration of pigments and fillers?PVC?on the film performance were discussed.Tear strength,elongation at break,bond strength,water resistance,chemical resistance,salt spray resistance,high and low temperature resistance,etc.,and compared with water emulsion asphalt waterproof coating industry standards;the results show When the amount of elastic emulsion 3030 is 25wt%and PVC is 20%,the tear strength reaches 4.5 k N/m,the elongation at break is 843%,the bonding strength of the paint film is1.0MPa,and the coating has the best mechanical properties.2.The second part explores the effects of emulsified asphalt and different film-forming resins,types and ratios of pigments and fillers,volume concentration of pigments and fillers,and film thickness on the performance of the film.The experimental results show that the choice of water-based epoxy emulsion 6520 and modified amine curing agent 8538 as the film-forming system blended with emulsified asphalt has the best overall performance;the talc powder with flake structure is selected as the constitution Filler,iron oxide red and zinc phosphate powder are used as anti-rust pigments according to the mass ratio of 3:2.The anti-rust pigments account for 60%of the total mass of the pigment and filler.The comprehensive performance of the paint film is the best;when the volume concentration of the pigment and filler?PVC?It is 30%,and the overall performance of the paint film is the best when the paint film thickness is 180?m.The prepared epoxy water-based asphalt anti-corrosion coating is resistant to H₂SO₄ solution for 31 days and salt spray resistance for35 days.