Preparation method of polyurethane coating with flame retardancy, light resistance and low voc

Abstract

The invention discloses a preparation method of polyurethane paint with flame retardance, light resistance and low VOCs (volatile organic compounds). According to the method, 0.22g of triethylene tetramine, 70g of polytetrahydrofuran ether glycol and 15g of hexamethylene diisocyanate are added into a 250ml flask with three necks, wherein the flask with three necks is provided with a stirrer, a condensation tube and a thermometer; the reaction is performed for 2h at 80 DEG C to obtain a polyurethane prepolymer A; 0.62g of acetamide and 8.2g of ethyl methyl ketone are added into the prepolymer A; the reaction is performed for 3.5h under the condition of 75 DEG C; 2g of modified manganese hypophosphite prepared in the first step, 4g of 4-carboxyphenylboronic acid and 2.5g of diethylenetriaminepenta acid are added; the reaction temperature is 80 DEG C; the reaction time is 2h; 7.1g of triethylamine is added for neutralization reaction for 60min; 0.9g of vitamin C and 70g of water are added for stirring and emulsification; the polyurethane paint with flame retardance, light resistance and low VOCs is obtained. The prepared polyurethane paint with flame retardance, light resistance and low VOCs achieves an environment-friendly effect, has low cost, is widely applied to surfaces of walls, furniture and hardware, and is used as a bonding agent of plastics, glass, papermaking and spinning.

Description

technical field [0001] The invention relates to a method for preparing a polyurethane coating, in particular to a method for preparing a polyurethane coating with flame retardancy, light resistance and low VOC. Background technique [0002] Polyurethane is mainly used in leather finishing, textile printing and dyeing, paper making, architectural coatings and adhesives and other fields. Because the coatings and paints sprayed on the surface of internal and external walls, furniture or metal appliances are in direct or indirect contact with humans, toxic and harmful coatings are always threatening people's health. In addition, because the field of use is often exposed to sunlight, and the sun's rays contain a large amount of ultraviolet light harmful to colored objects, with a wavelength of about 290-460nm, these harmful ultraviolet rays cause the color of the paint to change through chemical oxidation and reduction. Variety. [0003] Dibutyltin dilaurate is often used as a ...

AI Technical Summary

Problems solved by technology

[0003] Dibutyltin dilaurate is often used as a catalyst for the polymerization of polyurethane, but since the heavy metal tin is harmful to the environment with the degradation of polyurethane, how to fix the residual tin catalyzed by dibutyltin dilaurate and reduce the impact of polyurethane coating residues on the environment The degree of harm has become a technical problem

[0004] In order to improve the light resistance of polyurethane resin, it is often used to add ultraviolet absorbers and antioxidants, but the traditional synthetic antioxidants include tert-butyl hydroxyanisole, tert-butyl hydroperoxide and tert-butyl hydroquinone, etc. Larger toxic and side effects and carcinogenicity, and the effect of improving water resistance with traditional silicone materials is not satisfactory, so it is necessary to find more efficient and environmentally friendly waterproof and light-resistant measures