Water-based externally coated metal printing whitewash and preparation method thereof

Abstract

The invention provides water-based externally coated metal printing whitewash and a preparation method thereof. The whitewash comprises the following components in percentage by mass: 30-50% of water-based epoxy modified acrylic resin, 5-10% of amino resin, 40-60% of titanium dioxide slurry, 5-20% of dipropylene glycol methyl ether and 0.1-0.3% of an adhesion promoter, wherein the titanium dioxide slurry comprises 20-30% of water, 0.1-1.3% of a wetting dispersant and 0.2-0.3% of a defoamer as well as the balance of titanium dioxide. The whitewash provided by the invention is crosslinked and cured through the water-based epoxy modified acrylic resin and the amino resin with a certain amount of an assistant and white slurry to obtain the water-based externally coated metal printing whitewash which is good in adhesive force, strength and machinability. The production cost is lowered, and meanwhile, the water-based epoxy modified acrylic resin is low in content of volatile organic compounds, low in toxicity, less in atmospheric pollution and beneficial for environmental protection.

Description

technical field [0001] The invention relates to an iron white coating, in particular to a water-based external coating iron white coating and a preparation method thereof. Background technique [0002] With the development of my country's packaging industry, the canning industry has expanded rapidly, and at the same time, the demand for iron printing coatings related to the industrial chain has increased rapidly. Iron printing refers to the process of printing patterns on metal thin steel plates. The product types include beverage cans, food cans, and thermal insulation tanks. ﹑vacuum bottle ﹑ rice cooker ﹑ toys ﹑ metal photo frame and barrels and cans of fine chemical products, etc. The most common metal printing material for iron printing is tin-plated steel sheet (commonly known as "tinplate"). At present, commonly used iron printing coatings are thermosetting coatings, which are applied to the metal surface by printing or roller coating, and then heated and baked to cros...

AI Technical Summary

Problems solved by technology

Due to the metal hue of the metal sheet itself, it is not suitable for printing conventional color trademark patterns. Generally, the color pattern can be printed on white to show the best color effect. Therefore, in the printing of metal sheets, a layer of white paint should be coated on the metal surface first. However, the white paints widely used at home and abroad are mainly solvent-based resin paints, which release a large amount of toxic and harmful organic solvents during use, which will not only harm the health of construction workers, but also cause environmental pollution

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