Preparation method for flame-retardant waterproof aqueous polyurethane paint

Abstract

The invention discloses a preparation method for flame-retardant waterproof aqueous polyurethane paint. The preparation method comprises the following steps: in the existence of neodymium fluoride,1,4-bis(hydroxydimethylsilyl)benzene and isophorone diisocyanate are mixed according to the weight ratio of (1:1.3)-(1:2.4), a synergist and tris(4-fluorophenyl)phosphine are added, and the mixture reacts for 1-3 hours at 70-90 DEG C, to obtain a polyurethane prepolymer A; a chain extender, the weight of which accounts for 0.8-3.6% of that of the prepolymer A and a solvent, the weight of which accounts for 10-25% of that of the prepolymer A are added into the prepolymer A, the mixture reacts for 2-4 hours at 60-90 DEG C, triethylamine, the weight of which accounts for 10-15% of that of the prepolymer A is added for a neutralization reaction for 40-60 minutes, and water and sodium dodecyl sulfate are added to be emulsified for 60 minutes to obtain the flame-retardant waterproof aqueous polyurethane paint. The prepared flame-retardant waterproof polyurethane has the advantages of environmental friendliness and low price, and is widely applied to the surfaces of walls, furniture and metal appliances to be used as adhesive for plastic, glass, papermaking and textile.

Description

technical field [0001] The invention relates to a preparation method of polyurethane paint, in particular to a preparation method of flame-retardant and waterproof water-based polyurethane paint. 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 in the synthesis of polyurethane, but si...

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Problems solved by technology

[0003] Dibutyltin dilaurate is often used as a catalyst in the synthesis of polyurethane, but since the heavy metal tin is harmful to the environment with the degradation of polyurethane, efficient and non-toxic catalysts are screened is a major problem in the synthesis of polyurethane