Water-based chromium-free fingerprint-resistant paint for galvanized steel plate

Abstract

The invention discloses water-based chromium-free fingerprint-resistant paint for a galvanized steel plate. The paint comprises raw materials in parts by weight as follows: 30.0-55.0 parts of a fluorine-modified water-based self-crosslinking acrylate emulsion, 0.1-1.5 parts of a neutralizer, 0.5-1.0 part of a silane coupling agent, 0.1-0.2 parts of laurocapram, 0.6-1.0 part of chlorinated paraffin, 4.0-8.0 parts of inorganic sol, 1.5-3.5 parts of metal salt, 0.1-0.3 parts of glycerin, 0.1-0.2 parts of sodium carboxymethylcellulose, 0.1-0.2 parts of polydimethylsiloxane, 1.5-5.5 parts of a cosolvent, 1.0-2.5 parts of aluminium dihydrogen phosphate and 40-50 parts of water; the curing temperature is as low as 40-60 DEG C, and energy consumption is reduced. The fluorine-modified water-based self-crosslinking acrylate emulsion is adopted to enable a film to have weather-resistant, waterproof and self-cleaning performance and the like, the film has a self-repairing function when damaged, and the forming processability is greatly improved. Low VOC (volatile organic compounds) emission is realized, and the problem of chromium passivation pollution is solved.

Description

technical field [0001] The invention mainly relates to the field of coatings, in particular to a water-based chrome-free anti-fingerprint coating for galvanized steel sheets. Background technique [0002] Galvanizing is one of the most widely used metal surface treatment methods, and the zinc layer has excellent processing and use properties. However, the chemical properties of the zinc layer itself are relatively active, and defects such as white rust will appear due to corrosion in a humid environment. Therefore, the galvanized layer needs to be passivated to further improve its use effect. For a long time, chromate passivation has been widely used because of its simple process, excellent corrosion resistance, and low cost. However, the free hexavalent chromium contained in the chromium passivation film is extremely harmful to the environment and the human body, and the RoHS standard has explicitly prohibited the use of chromate passivation treatment. [0003] With the g...

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Problems solved by technology

Patent 201010277648.5 discloses a chromium-free water-based organic anti-fingerprint coating and its preparation method. The galvanized steel sheet treated by this invention has excellent anti-fingerprint and lubricity for stamping, but has no self-repairing function when the coating on the steel surface is damaged. As a result, the corrosion at the damaged part will spread rapidly; patent 201080054392.X discloses an acidic aqueous chromium-free composition for corrosion resistance treatment of galvanized steel sheet surface. The self-lubricating effect cannot be achieved, and the performance after stamping cannot be guaranteed; the patent US5068134 discloses a lubricant containing inorganic silicate, organic silicate and SiO 2 Sol and other chromium-free passivation solutions suitable for the surface of galvanized sheets basically achieve the effect of replacing chromium solutions, but the film forming temperature is required to be above 125°C, which requires too high curing capacity of the production line and causes energy waste

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