A kind of water-based aluminum powder baking paint capable of low temperature curing and preparation method and application thereof

Abstract

The invention provides a water-based aluminum powder baking paint capable of curing at low temperature, and a preparation method and application thereof. The water-based aluminum powder baking varnish comprises the following components calculated by weight: 30-35 parts of water-based acrylic resin; 10-13 parts of partially methyl-etherified amino resin; 1.3-2 parts of amine neutralizing agent; 5 parts; 5-7 parts of aluminum powder slurry; 5-7 parts of film-forming cosolvent; 10-15 parts of ethanol; 1.1-5.3 parts of auxiliary; 20-25 parts of water; the molecular weight of the water-based acrylic resin is 10000- 20000; the hydroxyl value of the water-based acrylic resin is 80-90 mgKOH / g; the aluminum powder slurry is obtained by passivating the aluminum powder with phosphoric acid ester. Using water-based acrylic resin with specific molecular weight and hydroxyl value and phosphate-passivated aluminum powder to obtain water-based aluminum powder baking paint, which can not only meet the performance requirements under the condition of low temperature curing, but also meet the performance requirements when it is cured by repeated spraying and curing at over-temperature baking. .

Description

Technical field [0001] The invention is a field of paint technology, and it is more specifically involved in a water -based aluminum powder paint and its preparation methods and applications that can be cured. Background technique [0002] At present, with the growth of the economy, environmental protection is becoming more and more important and stricter. Many solvent -based coatings on the market have switched to water -based environmentally friendly coatings. This moves from the source to control the emissions of VOCs. The coating industry will reduce the VOCs of 70-90 %. The constructionability, performance, appearance, and solvent-based aluminum powder paint of water-based aluminum pink paint are not much different. Therefore, water-based aluminum powder paint has been welcomed by the market. However, the water -based aluminum powder used in water -based aluminum pink paint needs to be stored in coatings with water as a diluent for a long time. In order to avoid the reaction...

AI Technical Summary

Problems solved by technology

However, the water-based aluminum powder used in water-based aluminum powder baking paint needs to be stored in the paint with water as the diluent for a long time. In order to avoid the reaction between metal aluminum and water, it is necessary to wrap the aluminum surface. Most of the substances are modified compounds such as silane, silicon dioxide or wax, which will precipitate on the surface of the coating film after baking and curing. When the workpiece has particles or poor quality such as color difference and needs to be re-sprayed, the surface of the aluminum powder will be wrapped. The modified compound migrates to the surface of the coating film, which will affect the poor interlayer adhesion with the re-sprayed topcoat, resulting in problems such as coating peeling and peeling

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