A kind of cationic polyurethane resin for water-based wood primer and preparation method thereof

A polyurethane resin, cationic technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of water resistance and adhesion defects, high synthesis difficulty, and achieve excellent anti-bleeding oil and anti-pigment bleed performance, moisturizing Good wettability and good emulsion stability

Inactive Publication Date: 2019-03-08
安徽思敬齐环保材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on the technical problems existing in the background technology, the present invention proposes a cationic polyurethane resin for water-based wood primers and a preparation method thereof to solve the problems of the existing water-based polyurethane wood primers in terms of permeability, sealing performance, hardness, transparency, and water resistance. Technical issues such as performance and adhesion deficiencies and high synthesis difficulty

Method used

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  • A kind of cationic polyurethane resin for water-based wood primer and preparation method thereof
  • A kind of cationic polyurethane resin for water-based wood primer and preparation method thereof
  • A kind of cationic polyurethane resin for water-based wood primer and preparation method thereof

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preparation example Construction

[0039] refer to figure 1 , a kind of preparation method that the present invention proposes is used for waterborne woodware primer cationic polyurethane resin, comprises the following steps:

[0040] S1, heating and melting the polyester diol, keeping it warm, and then vacuum dehydrating to obtain the macromolecular polyester diol A1;

[0041] S2. Add diisocyanate to macromolecular polyester diol A1, heat up, keep warm, add non-hydrophilic small molecule chain extender, crosslinking agent and acetone after cooling down, then add catalyst, heat up, keep warm, and obtain a prepolymer A2;

[0042] 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;

[0043] S4. After neutralizing the prepolymer A3, add water for emulsification and dispersion, and vacuum distillation to obtain a cationic polyurethane resin for water-based wood primer.

Embodiment 1

[0046] A kind of preparation method that the present invention proposes is used for waterborne woodware primer cationic polyurethane resin, comprises the following steps:

[0047] S1. Heat 20 parts by weight of terephthalic anhydride polyester diol with a number average molecular weight of 3200 to 140° C. to melt, keep it warm for 1 hour, and then vacuum dehydrate to obtain macromolecular polyester diol A1;

[0048] S2. Add 33 parts of diphenylmethane diisocyanate to macromolecular polyester diol A1, raise the temperature to 112°C, keep it warm for 1 hour, cool down to 60°C, add 6 parts of 1,4-butanediol and 3 parts of trihydroxy Methyl propane and 20 parts of acetone, then add 0.3 part of stannous octoate, heat up to 55 ° C, keep warm for 4 hours, and obtain prepolymer A2;

[0049] S3. After cooling the prepolymer A2 to 30°C, add dropwise a solution containing a cationic hydrophilic chain extender, wherein the solution containing a cationic hydrophilic chain extender consists...

Embodiment 2

[0052] A kind of preparation method that the present invention proposes is used for waterborne woodware primer cationic polyurethane resin, comprises the following steps:

[0053] S1. Mix 50 parts by weight of terephthalic anhydride polyester diol with a number average molecular weight of 2500 and 26 parts of polyadipate-1,4-butylene glycol with a number average molecular weight of 1000 Afterwards, heat up to 70°C to melt, keep warm for 5 hours, and then vacuum dehydrate to obtain macromolecular polyester diol A1;

[0054] S2. Add 52 parts of 4,4-dicyclohexylmethane diisocyanate into 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 neopentyl glycol, 2 parts of three Methylol propane and 30 parts of acetone, then add 0.05 part of dibutyltin dilaurate, heat up to 90°C, keep warm for 1 hour, and obtain prepolymer A2;

[0055] S3. After cooling the prepolymer A2 to 40°C, add dropwise a solution containin...

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Abstract

The invention discloses a preparation method of a cationic polyurethane resin for waterborne wood primers, which comprises the following steps: heating polyester glycol to melt, carrying out heat preservation, and then carrying out vacuum dehydration on the obtained product so as to obtain macromolecular polyester glycol A1; adding diisocyanate into the macromolecular polyester glycol A1, heating, carrying out heat preservation, cooling, then adding a non-hydrophilic micromolecular chain extender, a crosslinking agent and acetone, adding a catalyst, heating the obtained mixture, and carrying out heat preservation on the obtained product, so that a prepolymer A2 is obtained; cooling the prepolymer A2, dropwise adding a cationic hydrophilic chain extender containing solution, heating the obtained mixture, and carrying out heat preservation on the obtained product, so that a prepolymer A3 is obtained; and after the prepolymer A3 is neutralized, adding water for carrying out emulsification and dispersion, and carrying out vacuum distillation on the obtained product, so that the cationic polyurethane resin for waterborne wood primers is obtained. The invention also discloses a cationic polyurethane resin for waterborne wood primers. The method disclosed by the invention is simple, strong in permeability, high in hardness, good in adhesion, and excellent in transparency and water resistance.

Description

technical field [0001] The invention relates to the technical field of water-based coatings, in particular to a cationic polyurethane resin used for water-based wood primers 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/06C08G18/42C08G18/32C08G18/12
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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