Boiling-water-boiling-resistant water-based glass coating and preparation method thereof

Abstract

The preparation method comprises the following steps: combining a component A with a component B to obtain the boiling-water-resistant water-based glass coating, wherein the component A is prepared from water-soluble epoxy modified acrylic resin, water-based amino resin, an amine neutralizer, a water-based wetting agent, a water-based defoaming agent, a cosolvent and deionized water; and the component B is a silane coupling agent. According to the invention, the water-soluble resin can be better dissolved in water by virtue of the feeding sequence and process parameters, so that the use of a cosolvent is reduced, and meanwhile, the assistants are more uniformly and stably dispersed in a coating system, so that the product quality is ensured. Color paste or color concentrate can be added into the water-based glass coating, the water-based glass coating has good color development performance and vividness, the coating is resistant to boiling water boiling for 2 h after being dried and has no abnormity, and particularly the problems that existing water-based glass coatings on the market have no adhesion and are not resistant to boiling water boiling after sky blue color concentrate isadded are solved.

Description

technical field [0001] The invention belongs to coating technology, in particular to a boiling-resistant water-based glass coating and a preparation method thereof. Background technique [0002] Glass coatings are widely used in cosmetic glass bottles, wine bottles, gift decoration bottles, etc. in daily life to play the role of beautiful decoration, covering the defects of the glass itself or protecting the glass from being scratched; The surface coating of glass products is in direct contact. With the improvement of people's awareness of environmental protection, health and safety, the requirements for the surface coating of glass products are becoming increasingly stringent. At present, according to incomplete statistics of the market, 70-80% of glass coatings are water-based coatings, of which 80-90% are water-soluble glass coatings, and the rest are water-based dispersion glass coatings. The ratio of water-based dispersion glass coatings during construction is 100% : 0...

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Problems solved by technology

[0003] There are several shortcomings and deficiencies in the existing water-based glass coatings: ①Whether it is water-soluble glass coating or water-based dispersion glass coating, the coating is not water-resistant after drying, or the water resistance is only at room temperature. After testing for 0.5H, the paint film will fall off, wrinkle and swell or the 0B-4B test of the hundred grids will not meet the requirements of 5B. In practice, the coating of glass products will often contact boiling water, resulting in damage to the surface coating; especially , after adding sky blue color essence (1%-20%), after the coating is dried, soak in boiling water at 100°C for 0.5H and then test the adhesion, the result is 0B, which causes great trouble to users; ② Existing Due to the poor miscibility of the dispersion resin and co-solvent in the water-based dispersion glass coating, and the phenomenon of delamination between the dispersion resin, co-solvent and water, the coating is easy to deteriorate during storage and the construction is uneven. Therefore, Adding little or no co-solvent content, it is difficult to spray a large area in practical applications, resulting in too low production capacity and unable to meet market demand; ③ most of the existing water-soluble glass coatings have too much co-solvent added, resulting in In spraying application, VOC>200g / L, exceeding the national environmental protection coating standard, and due to the unreasonable combination of different co-solvents, the coating will have orange peel, low gloss and not bright enough color after drying; ④ water-based coatings currently on the market Most of the glass coatings need to be baked at a minimum temperature of 170-180°C, and some need to add drier or cooling agent, which increases energy consumption and increases costs

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