Water-based white finish for metal printing and preparation method thereof

Abstract

The invention provides a water-based white finish for metal printing and a preparation method thereof. The water-based white finish comprises, by mass, 25%-55% of waterborne epoxy acrylic resin, 5%-15% of alkyd resin, 35%-50% of titanium dioxide slurry, 5%-25% of propylene glycol ether and 0.1%-0.4% of an adhesion promoter, wherein the titanium dioxide slurry contains 25%-35% of water, 0.1%-1.2% of a wetting and dispersing agent and 0.1%-0.4% of an antifoaming agent, with the balance being titanium dioxide. The water-based white finish for metal printing in the invention is prepared through cross-linking and curing of the waterborne epoxy modified acrylic resin and the alkyd resin and addition of certain auxiliary agents and the titanium dioxide slurry, and the prepared finish has good adhesion, strength and processing resistance and is reduced in production cost; meanwhile, the waterborne epoxy modified acrylic resin is low in the content of volatile organic compounds, low in toxicity, little in air pollution and favorable for environmental protection.

Description

technical field [0001] The invention relates to an iron printing white paint, in particular to a water-based iron printing white finish paint 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. ﹑Electric cooker ﹑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 cross-link and solid...

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