Preparation method for lightproof and waterproof polyurethane coating

Abstract

The invention discloses a preparation method for lightproof and waterproof polyurethane coating. The preparation method for the lightproof and waterproof polyurethane coating comprises the following steps: under the condition that the dibutyltin dilaurate catalyst exists, PTMG and dicyclohexyl methane diisocyanate are mixed; the reaction is conducted for 1-4 hours at a temperature of 60-85 DEC G; methyl thiouracil and drostanolone are added; the reaction time lasts for 1 hour; the reaction temperature is 80 DEC G; a polyurethane prepolymer A is obtained; chain extender, N- methyl pyrrolidone and formamide are added to the polyurethane prepolymer A; the reaction is conducted for 2.5-3.5 hours at 75 -85 DEC G; a mixed liquor A is added; the reaction temperature is 70-95 DEC G; the reaction time is 2-3 hours; a neutralizers is added for a neutralization reaction for 30-50 min; water is added for emulsification; the lightproof and waterproof polyurethane coating is obtained. The prepared lightproof and waterproof polyurethane coating is environment friendly and inexpensive in price. Therefore, the lightproof and water-based polyurethane coating can be extensively applied to surfaces of the wall bodies, furniture and metal wares and served as binding agent of plastics, glass, paper manufacturing and textile.

Description

[0001] Technical field The present invention relates to the preparation method of polyurethane, relate in particular to a kind of preparation method of light fastness waterborne polyurethane coating. Background technique

[0002] Polyurethane is mainly used in leather finishing, textile printing and dyeing, papermaking, architectural coatings, adhesives, etc. The coatings and paints sprayed on the surface of internal and external walls, furniture, and metal appliances are in direct or indirect contact with humans all the time. , Harmful coatings have also threatened people's health at all times. Because the field of use is often exposed to sunlight, because the sun’s rays contain a large amount of ultraviolet light harmful to colored objects, its wavelength is about 290-460nm, these harmful ultraviolet light changes the color of the paint through chemical oxidation and reduction.

[0003] Dibutyltin dilaurate is often used as a catalyst for the polymerization of polyurethane, ...