Water-tolerant coating based on epoxy resin modified polyurethane emulsion

Abstract

The invention discloses a water-tolerant coating based on an epoxy resin modified polyurethane emulsion. The water-tolerant coating is prepared from the following raw materials in mass fraction: 60%-80% of an epoxy-modified aliphatic waterborne polyurethane emulsion, 5%-10% of modified silica sol, 3%-8% of talcum powder, 1%-3% of emulsified silicone oil, 0.1%-0.5% of an acrylate copolymer ammonium salt solution, 0.5%-1% of an alkali-swelling acrylate thickener, 0.3%-0.6% of polyether polyester modified organic siloxane, 0.1%-0.5% of acrylic copolymer sylvite, 0.1%-0.5% of polyether modified organosilicone and the balance of distilled water, wherein the epoxy-modified aliphatic waterborne polyurethane emulsion is prepared from the following raw materials in parts by mass: 40-80 parts of toluene diisocynate, 25-40 parts of polypropylene glycol, 25-60 parts of polyethylene glycol, 3-10 parts of dimethylolpropionic acid, 5-12 parts of epoxy resin, 50-80 parts of butanone, 4-10 parts of diethylenetriamine, 3-11 parts of triethylamine, 1-3 parts of dibutyltin dilaurate and 40-80 parts of distilled water. The coating disclosed by the invention has excellent water tolerance, relatively high stability, relatively strong cohesion, good peelable property and relatively high paint film strength.

Description

technical field [0001] The invention relates to the field of packaging and decoration, in particular to a water-resistant coating based on epoxy resin modified polyurethane emulsion. Background technique [0002] In order to prevent the materials or semi-products exposed to the atmosphere from being polluted, corroded and damaged, and prolong their service life, they are usually coated with good protective and peelable coatings on their surfaces for effective and temporary maintenance. Archive protection. In this way, it can not only isolate the invasion of air, salt spray, and microorganisms from the outside to achieve anti-corrosion effect; but also achieve the effect of cleaning and decontamination by adsorbing pollutants. Compared with solvent-based protective coatings, water-based protective coatings are safer and more environmentally friendly, so they are widely used in the field of product packaging and decoration. However, the existing water-based protective coati...

AI Technical Summary

Problems solved by technology

However, the existing water-based protective coatings still have the disadvantages of low film strength, poor peelability and single protective performance.