Water-based aluminum powder stoving varnish capable of being cured at low temperature as well as preparation method and application of water-based aluminum powder stoving varnish

Abstract

The invention provides water-based aluminum powder stoving varnish capable of being cured at low temperature as well as a preparation method and application of the water-based aluminum powder stoving varnish. The water-based aluminum powder stoving varnish comprises the following components in parts by weight: 30-35 parts of water-based acrylic resin; 10 to 13 parts of partially methylated amino resin; 1.3 to 2 parts of an amine neutralizer; 2-5 parts of a water-based silver strip auxiliary agent; 5-7 parts of aluminum powder slurry; 5-7 parts of a film-forming cosolvent; 10 to 15 parts of ethanol; 1.1 to 5.3 parts of an auxiliary agent; 20 to 25 parts of water; the molecular weight of the water-based acrylic resin is 10000 to 20000; the hydroxyl value of the water-based acrylic resin is 80 to 90 mgKOH / g; the aluminum powder slurry is obtained by passivating aluminum powder through phosphate ester. Water-based acrylic resin with specific molecular weight and hydroxyl value and phosphate passivated aluminum powder are adopted to obtain the water-based aluminum powder stoving varnish, and the water-based aluminum powder stoving varnish can meet the performance requirements under the condition of low-temperature curing and can also meet the performance requirements during over-temperature baking and repeated spraying curing.

Description

technical field [0001] The invention belongs to the technical field of baking varnish, and more specifically relates to a water-based aluminum powder baking varnish capable of curing at low temperature and its preparation method and application. Background technique [0002] At present, with economic growth, 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 has controlled the emission of VOCs from the source. According to estimates, after switching to water-based coatings, the overall The paint industry will reduce VOCs by 70-90%. The workability, performance and appearance of water-based aluminum powder baking paint are not much different from solvent-based aluminum powder baking paint. Therefore, water-based aluminum powder baking paint has been welcomed by the market. However, the water-based aluminum powder used in water-based aluminum p...

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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