Preparation method of modified silica sol/polyurethane emulsion compound peelable protective paint

Abstract

The invention discloses a preparation method of a modified silica sol / polyurethane emulsion compound peelable protective paint. The preparation method comprises the following steps: 1) adding toluene diisocyanate and the like into a first reaction kettle at room temperature to obtain a primary product; 2) adding dimethylolpropionic acid into the primary product, and adding triethylamine to obtain an aromatic water-based polyurethane emulsion; 3) preparing a modified silica sol; 4) adding the modified silica sol and aromatic water-based polyurethane emulsion into a third reaction kettle at room temperature to obtain a mixed emulsion for later use; 5) adding right amounts of acrylic acid copolymer potassium salt and the like into a distilled-water-containing fourth reaction kettle to obtain a mixed substrate; and 6) adding the mixed emulsion into the mixed substrate to obtain the modified silica sol / polyurethane emulsion compound peelable protective paint. The protective paint prepared by the method can effectively perform sealed protection on the protected object, thereby preventing the protected object from pollution, corrosion and damage.

Description

technical field [0001] The invention relates to the field of packaging and decoration, in particular to a method for preparing a peelable protective coating compounded with modified silica sol and 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 ...

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.