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Preparation method for acrylic acid modified polyurethane water dispersion

A polyurethane water dispersion and polyurethane dispersion technology, which is applied in the field of acrylic modified polyurethane water dispersion for wood primer and its preparation, can solve the problem that the water resistance and sandability of the paint film are not good enough, the degree of crosslinking is not enough, and the PUA linear structure Branching and other problems, to achieve the effect of improving storage stability and improving hydrolysis stability

Inactive Publication Date: 2009-01-14
WUXI HUHUANG PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many ways to synthesize PUA, but the main method is to use hydroxy acrylate monomers to block the polyurethane, and then disperse in water to carry out emulsion polymerization with acrylate monomers. The PUA synthesized by this method is mainly linear structure branched. And the degree of cross-linking is not enough, the water resistance and sanding property of the paint film are not good enough

Method used

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  • Preparation method for acrylic acid modified polyurethane water dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 3 parts of maleic anhydride, 30 parts of isophthalic acid, 15 parts of adipic acid, 35 parts of neopentyl glycol, 15 parts of propylene glycol, 0.5 parts of hydroquinone as a polymerization inhibitor, and the number average molecular weight is synthesized by solution polymerization method 1400-2000, polyester diol with a small amount of double bonds in the main chain.

[0015] First add 25 parts of dimethylol propionic acid (DMPA) to 22 parts of N-methylpyrrolidone, heat to dissolve, and mix 300 parts of polyester diol (H15) and 120 parts of toluene diisocyanate (TDI) at 80 React at ℃ for about 2 hours, then add the above-mentioned N-methylpyrrolidone solution of DMPA, continue the reaction until the isocyanate (NCO) reaches 0.63mmol / g, and add 0-100 parts of acetone to adjust the system depending on the increase in viscosity during the reaction Viscosity (guaranteed system viscosity ≤ 50s, cell test tube 25°C). Then lower the temperature to 50°C, add 15 parts of triet...

Embodiment 2

[0018] 1 part of maleic anhydride, 20 parts of isophthalic acid, 5 parts of adipic acid, 30 parts of neopentyl glycol, 10 parts of propylene glycol, 0.01 part of hydroquinone as a polymerization inhibitor, and the number average molecular weight is synthesized by solution polymerization method 1400-2000, polyester diol with a small amount of double bonds in the main chain.

[0019] First add 35 parts of dimethylol propionic acid (DMPA) to 20 parts of N-methylpyrrolidone, heat to dissolve, and mix 300 parts of polyester diol (H15) and 140 parts of toluene diisocyanate (TDI) at 80 React at ℃ for about 2 hours, then add the above-mentioned N-methylpyrrolidone solution of DMPA, continue the reaction until the isocyanate (NCO) reaches 0.71mmol / g, and add 0-100 parts of acetone to adjust the system depending on the increase in viscosity during the reaction Viscosity (guaranteed system viscosity ≤ 50s, cell test tube 25°C). Then lower the temperature to 50°C, add 21 parts of triethy...

Embodiment 3

[0022] 5 parts of maleic anhydride, 50 parts of isophthalic acid, 20 parts of adipic acid, 50 parts of neopentyl glycol, 20 parts of propylene glycol, 0.1 part of hydroquinone as a polymerization inhibitor, and the number average molecular weight was synthesized by solution polymerization method 1400-2000, polyester diol with a small amount of double bonds in the main chain.

[0023] First add 30 parts of dimethylol propionic acid (DMPA) to 25 parts of N-methylpyrrolidone, heat to dissolve, and mix 300 parts of polyester diol (H15) and 130 parts of toluene diisocyanate (TDI) at 80 React at ℃ for about 2 hours, then add the above-mentioned N-methylpyrrolidone solution of DMPA, continue the reaction until the isocyanate (NCO) reaches 0.67mmol / g, and add 0-100 parts of acetone to adjust the system depending on the increase in viscosity during the reaction Viscosity (guaranteed system viscosity ≤ 50s, cell test tube 25°C). Then lower the temperature to 50°C, add 18 parts of triet...

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Abstract

The invention discloses a preparation method for acrylic acid modified polyurethane waterborne dispersion, which comprises three steps, namely polyesterglycol synthesis, polyurethane dispersion synthesis and acrylic acid modified polyurethane waterborne dispersion synthesis. In the preparation method of the invention, polyesterglycol is synthesized by adopting neopentylene glycol and isophthalic acid with the better hydrolytic stability, thus the storage stability of polyesterglycol is improved. A given mass of conjugated double bond is introduced in the trunk chain, the conjugated double bond can be copolymerized with acrylic monomers, thereby graft copolymer is formed. Because the product is the graft copolymer of polyurethane and acrylic acid, advantages of the two substances can be fully exerted, thus disadvantages of poor stability, poor water resistance and weatherability of single group modified water-based polyurethane hydrolization and poor adhesive force of acrylic acid emulsion, and the like, are ameliorated. By utilizing water as a dispersion medium in the acrylic acid modified polyurethane dispersion used for woodenware priming paint prepared through the invention, the capability of environment protecting without pollution is provided, therefore, the acrylic acid modified polyurethane waterborne dispersion is suitable for indoor decorating utilization, and has the advantages of being harmless and secure to human body.

Description

technical field [0001] The invention relates to a coating and a preparation method thereof, in particular to an acrylic-modified polyurethane aqueous dispersion for wood primers and a preparation method thereof. Background technique [0002] In recent years, as people pay more and more attention to environmental protection, water-based wood coatings have developed rapidly in the field of home decoration. At present, the research reports on waterborne polyurethane wood coatings are mostly concentrated on the topcoat, and there are few reports on the matching primer. Both single polyurethane dispersion and acrylic emulsion (dispersion) have obvious shortcomings, such as polyurethane dispersion The adhesion is very good, the fullness is also good, but the water resistance and weather resistance are generally poor; while the acrylic emulsion has good weather resistance, but the adhesion and fullness are not enough, and the copolymer of the two can effectively make up for their r...

Claims

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Application Information

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IPC IPC(8): C08F283/00C08G18/83C08G18/68C09D151/08
Inventor 胡胜初薛隽
Owner WUXI HUHUANG PAINT
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