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Waterborne polyurethane wood primer resin and preparation method thereof

A water-based polyurethane and woodware technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of high synthesis difficulty, water resistance and adhesion defects, and achieve good wettability, anti-oil leakage and anti-pigmentation bleeding Excellent performance and good water resistance

Inactive Publication Date: 2015-12-23
安徽思敬齐环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the technical problems existing in the background technology, the present invention proposes a water-based polyurethane wood primer resin and a preparation method thereof to solve the problems of the existing water-based polyurethane wood primer in terms of permeability, sealing performance, hardness, transparency, water resistance and adhesion Defects and technical problems such as high difficulty in synthesis

Method used

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  • Waterborne polyurethane wood primer resin and preparation method thereof
  • Waterborne polyurethane wood primer resin and preparation method thereof

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preparation example Construction

[0041] refer to figure 1 , the preparation method of a kind of aqueous polyurethane wood primer resin that the present invention proposes, comprises the following steps:

[0042] S1, heating and melting the polyester diol, followed by vacuum dehydration to obtain macromolecular polyester diol A1;

[0043] S2. Add diisocyanate to macromolecular polyester diol A1, heat up, keep warm, add non-hydrophilic small molecule chain extender, anionic hydrophilic chain extender, cross-linking agent and solvent after cooling down, and then add catalyst, Heating up and keeping warm to obtain prepolymer A2;

[0044] S3. After cooling the prepolymer A2, dropwise add a solution containing a cationic hydrophilic chain extender, heat up, and keep warm to obtain the prepolymer A3;

[0045]S4. After neutralizing the prepolymer A3, add water for emulsification and dispersion, and vacuum distillation to obtain a waterborne polyurethane wood primer resin.

Embodiment 1

[0048] A kind of preparation method of waterborne polyurethane woodware primer resin that the present invention proposes, comprises the following steps:

[0049] S1. After mixing 20 parts by weight of terephthalic anhydride polyester diol with a number average molecular weight of 2500 and 26 parts of polycarbonate diol with a number average molecular weight of 1000, heat up to 130°C to melt, and the holding time For 1h, then vacuum dehydration to obtain macromolecular polyester diol A1;

[0050] S2. Add 52 parts of isophorone diisocyanate to macromolecular polyester diol A1, raise the temperature to 65°C, keep it warm for 4 hours, cool down to 40°C, add 11 parts of 1,4-butanediol, 0.1 part of dihydroxy Add methacrylic acid, 3 parts of trimethylolpropane and solvent, then add 0.05 part of stannous octoate, raise the temperature to 80°C, and keep it warm for 1 hour to obtain prepolymer A2;

[0051] S3. After cooling the prepolymer A2 to 40°C, add dropwise a solution containing ...

Embodiment 2

[0054] A kind of preparation method of waterborne polyurethane woodware primer resin that the present invention proposes, comprises the following steps:

[0055] S1. Heat up 50 parts by weight of terephthalic anhydride polyester diol with a number average molecular weight of 3200 to 80° C. to melt, hold the temperature for 4 hours, and then vacuum dehydrate to obtain macromolecular polyester diol A1;

[0056] S2. Add 33 parts of 4,4-dicyclohexylmethane diisocyanate into macromolecular polyester diol A1, raise the temperature to 100°C, keep it warm for 2 hours, cool down to 50°C, add 6 parts of diethylene glycol, 0.5 1 part of dimethylolbutyric acid, 2 parts of trimethylolpropane and solvent, then add 0.3 part of dibutyltin dilaurate, raise the temperature to 75°C, and keep it warm for 4 hours to obtain prepolymer A2;

[0057] S3. After the prepolymer A2 is cooled to 30°C, a solution containing 5 parts of N-methyldiethanolamine and 2 parts of dimethylethanolamine is added dropw...

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Abstract

The invention discloses a waterborne polyurethane wood primer resin, wherein the soft section of the waterborne polyurethane wood primer resin is terephthalic anhydride polyester glycol, and the hard section of the waterborne polyurethane wood primer resin includes diisocyanate and a small molecule chain extender. The invention also discloses a preparation method of the waterborne polyurethane wood primer resin, which comprises the following steps: raising the temperature of polyester glycol for melting, insulating, and dehydrating in vacuum to obtain large molecule polyester glycol A1; adding diisocyanate into large molecule polyester glycol A1, raising the temperature, insulating, cooling, then adding a non-hydrophilic small molecule chain extender, an anionic hydrophilic chain extender, a cross-linking agent and a solvent, then adding a catalyst, raising the temperature, and insulating to obtain a prepolymer A2; cooling the prepolymer A2, then dropwise adding a solution containing a cationic hydrophilic chain extender, raising the temperature, and insulating to obtain a prepolymer A3; and neutralizing the prepolymer A3, adding water for emulsion dispersion, and carrying out vacuum distillation to obtain the waterborne polyurethane wood primer resin. The waterborne polyurethane wood primer resin has the advantages of simple method, high hardness and good adhesive force.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a water-based polyurethane wood primer resin and a preparation method thereof. Background technique [0002] Wooden furniture finishing is an indispensable part of coatings, and its consumption ranks first in industrial coatings in many countries. According to statistics from the Furniture Association, the output value of my country's furniture industry in 2013 has reached 646.275 billion yuan, but most of it is still occupied by solvent-based wood coatings. The large-scale and frequent occurrence of persistent smog can not help but make people realize the seriousness of VOC emissions. From February 1, 2015, the state began to impose a 4% paint consumption tax on paint companies with a VOC content higher than 420g / L to limit VOC. emissions. Water-based wood lacquers are more and more recognized and favored by the market due to their advantages of non-toxicity and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C08G18/66C08G18/42C08G18/32C08G18/34C08G18/12
Inventor 王继印陶灿徐杰
Owner 安徽思敬齐环保材料有限公司
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