Preparation method of light-resistant water-based polyurethane coating
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A water-based polyurethane, light resistance technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor stability, hard polyurethane film, poor storage stability of polyurethane, etc., to achieve good compatibility, good light resistance, resistance to The effect of improving solvent resistance and abrasion resistance
Inactive Publication Date: 2013-12-11
HESHAN YIXIN CHEM CO LTD
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However, because the field of use is often exposed to sunlight, the sun’s rays contain a large amount of ultraviolet light that is harmful to light-colored objects, and its wavelength is 290~460nm. These ultraviolet rays change the color of the material surface through chemical oxidation and reduction, affecting the appearance of the surface.
[0003] At present, there are two ways to prepare light-resistant polyurethane. One is to use polycarbonate diol instead of polyester diol or polyether diol and isocyanate for prepolymerization. The polyurethane synthesized in this way has better light resistance, but The synthesized polyurethane film is too hard; another way is to compound polyurethane with nano-materials such as nano-titanium dioxide, nano-zinc oxide, carbon nanotubes, etc. to improve the light resistance of polyurethane, but due to the poor stability of nano-material emulsion, The storage stability of the polyurethane prepared by this method is relatively poor
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[0013] detailed description Below in conjunction with example further illustrate the present invention.
example 1
[0015] (1), in the 500ml four-neck flask that stirrer blade, thermometer, condenser pipe are housed, bisphenol S25g is mixed with hexamethylene diisocyanate 20.2g, under the condition that dibutyltin dilaurate catalyst exists 0.14g , stirred and reacted at 60°C for 1.5h to obtain 45.1g of polyurethane prepolymer A;
[0016] (2), add 1.64g of hydrophilic chain extender megludecanoic acid to the polyurethane prepolymer, the stirring reaction time is 40min, add 6.8g of dimethyl sulfoxide to A, and stir and react for 1.0g at 80°C h, adding 2.0 g of triethylamine for neutralization, stirring and reacting for 30 min, adding 150 g of water for emulsification, forming a light-resistant water-based polyurethane coating B;
example 2
[0018] (1), in the 500ml four-neck flask that stirrer blade, thermometer, condenser tube are housed, bisphenol S25g is mixed with isophorone diisocyanate 77.7g, under the condition that dibutyltin dilaurate catalyst 0.62g exists , stirred and reacted at 85°C for 3.5h to obtain 102.5g of polyurethane prepolymer A;
[0019] (2), add 7.9g of hydrophilic chain extender 2,3-dihydroxysuccinic acid to the polyurethane prepolymer, the stirring reaction time is 80min, add 35.9g of methyl ethyl ketone to A, and stir and react at 95°C for 4.0 h, add 6.6g of triethylamine to neutralize, stir and react for 70min, add 160g of water to emulsify, and form a kind of lightfast water-based polyurethane coating B;
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Abstract
The invention discloses a preparation method of a light-resistant water-based polyurethane coating. The preparation method comprises the following steps of: mixing bisphenol S and diisocyanate in the presence of a dibutyltin dilaurate catalyst, and stirring to react at 60-85 DEG C for 1.5-3.5 hours to obtain a polyurethane prepolymer A; adding a hydrophilic chain extender with carboxyl content accounting for 1.2%-4.6% of the weight of A into A, then adding a solvent which accounts for 15%-35% of the weight of A, and stirring to react under the condition of 80-95 DEG C for 1.0-4.0 hours; adding triethylamine according to the condition that the mole ratio of COOH/NH2 is 0.6:(1-1.6):1 for neutralization, stirring to react for 30-70 minutes, and adding water for emulsification to form the light-resistant water-based polyurethane coating. The prepared light-resistant water-based polyurethane is environmentally-friendly and low in cost and can meet the requirement of the market on the property of light-resistant polyurethane.
Description
technical field [0001] The invention relates to a preparation method of water-based polyurethane, in particular to a preparation method of light-resistant water-based polyurethane coating. Background technique [0002] Water-based polyurethane uses water as the dispersion medium, is non-toxic, tasteless, and does not pollute the environment. It is widely used in wood coatings, automotive repair coatings, anti-corrosion coatings, architectural coatings, floor paints, electronic coatings, special coatings, polyurethane waterproof coatings, etc. However, because the field of use is often exposed to sunlight, the sun’s rays contain a large amount of ultraviolet light that is harmful to light-colored objects, and its wavelength is 290~460nm. These ultraviolet rays cause color changes on the surface of the material through chemical oxidation and reduction, affecting the appearance of the surface. . [0003] At present, there are two ways to prepare light-resistant polyurethane. O...
Claims
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