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Method for preparing aqueous alkyd resin

A water-based alkyd resin, alkyd resin technology, used in coatings, polyurea/polyurethane coatings, etc., can solve the difference in water resistance and chemical resistance. Resin crosslinking density is low and other problems, to achieve the effect of long curing time, short curing time and increasing crosslinking density

Active Publication Date: 2014-05-14
ZHUHAI CHANGXIAN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a preparation method of water-based alkyd resin, which introduces the method of blocking and unblocking isocyanate to prepare water-based alkyd resin, and solves the problems of low crosslinking density, low hardness, water resistance and Technical problems of poor chemical resistance and high reactivity of isocyanates which make storage and use unsuitable as one-component systems

Method used

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  • Method for preparing aqueous alkyd resin

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Implementation 1: Take 434.4 grams of soy oil, 22.75 grams of benzoic acid, 163.4 grams of isophthalic acid, and 169 grams of pentaerythritol into a four-necked bottle, and react at a constant temperature of 150°C for one hour, and then heat up to a constant temperature of 230° at a rate of 26.67°C / h . When the acid value of the system is less than 10mlKOH / g, cool down to 180°, add 70 grams of trimellitic anhydride, and react at a constant temperature of 180° for one hour. When the acid value of the system is about 50mlKOH / g, cool down to 80° and set aside.

[0022] Take 500 grams of the prepared alkyd resin, heat up to 80°, add 25 grams of isophorone diisocyanate, 0.1 gram of dibutyltin laurate, and react at a constant temperature of 80° for 4 hours. When the concentration of the isocyanate group in the system is about 0.01 mol / L, add 50 grams of methyl ethyl ketone oxime, keep the temperature for 6 hours. When the concentration of the isocyanate group in the system i...

Embodiment 2

[0023] Implementation 2: Take 434.4 grams of soy oil, 44 grams of benzoic acid, 130 grams of isophthalic acid, and 169 grams of pentaerythritol into a four-necked bottle, react at a constant temperature of 150°C for one hour, and heat up to a constant temperature of 230°C at a rate of 26.67°C / h . When the acid value of the system is less than 10mlKOH / g, cool down to 180°, add 74 grams of trimellitic anhydride, and react at a constant temperature of 180° for one hour. When the acid value of the system is about 50mlKOH / g, cool down to 80° and set aside.

[0024] Take 500 grams of prepared alkyd resin, heat up to 80°, add 28 grams of hexamethylene diisocyanate, 0.1 gram of dibutyltin laurate, and react at a constant temperature of 80° for 4 hours. When the concentration of the isocyanate group in the system is about 0.01 mol / L, add 55 grams of methyl ethyl ketone oxime, keep the temperature for 6 hours. When the content of urethane groups in the system is less than 0.0005mol / L, ...

Embodiment 3

[0025] Implementation 3: Take 400 grams of soy oil, 55 grams of benzoic acid, 130 grams of isophthalic acid, and 169 grams of trimethylolpropane into a four-necked bottle, react at a constant temperature of 160°C for one hour, and heat up at a rate of 26.67°C / h to 230° constant temperature. When the acid value of the system is less than 10mlKOH / g, cool down to 180°, add 72 grams of trimellitic anhydride, and react at a constant temperature of 180° for one hour. When the acid value of the system is about 50mlKOH / g, cool down to 80° and set aside.

[0026] Take 500 grams of prepared alkyd resin, heat up to 80°, add 28 grams of toluene diisocyanate, 0.1 gram of dibutyltin laurate, and react at a constant temperature of 75° for 4 hours. When the content of isocyanate groups in the system is about 0.01mol / L, add Methyl ethyl ketone oxime 55 grams, 80 ° of constant temperature 6 hours. When the content of urethane groups in the system is less than 0.0005mol / L, add 210 grams of ethy...

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Abstract

The invention provides a method for preparing an aqueous alkyd resin. The preparation method comprises the following steps: preparing the alkyd resin from vegetable oil acid, polyhydric alcohol, benzoic acid and polyatomic acid, subsequently cooling, adding organic polyatomic acid, controlling the acid value of the system, further cooling, adding isocyanate and a catalyst, controlling the content of an isocyanate group, adding methyl ethyl ketoxime and reacting at constant temperature, controlling the content of urethane, and adding butyl cellosolve and n-butyl alcohol to reduce the temperature so as to obtain the alkyd resin. According to the method, methyl ethyl ketoxime is adopted to seal up the isocyanate group, so that the defect that isocyanate is not applicable to storage and application as a single component system because of the high reaction activity is overcome, and moreover after the resin is made into a coating for filming, the sealed isocyanate group is opened and subsequently is subjected to irreversible cross-linking reaction with water in air or hydroxyl of the aqueous alkyd resin, and the cured aqueous alkyd resin is high in cross-linking density, high in hardness and excellent in water resisting and chemical medicine resistance.

Description

technical field [0001] The invention relates to a preparation method of water-based alkyd resin, in particular to a preparation method of water-based alkyd resin. Background technique [0002] Modified with vegetable oil (such as castor oil, soybean oil, linseed oil, etc.) Alkyd resins synthesized by esterification with polybasic acids (such as phthalic anhydride, m-benzene, maleic anhydride, etc.), including dry, semi-dry and non-dry oleoresins. Gloss and dispersibility are the main film-forming substances of alkyd, amino, nitro, polyurethane and many other coatings, and are widely used in various coatings. Alkyd resin has the characteristics of dryness, gloss, flexibility, good adhesion, good wetting performance to pigments, excellent construction performance, full coating and excellent decoration. In addition, the production of alkyd resin does not depend on the petroleum industry, is not easily affected by international oil prices, and is cheap; the components of alkyd...

Claims

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Application Information

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IPC IPC(8): C08G18/80C08G18/67C08G63/49C09D175/14
CPCC08G18/4288C08G18/8077C08G63/48C09D175/14
Inventor 杨伟明强伟锋
Owner ZHUHAI CHANGXIAN CHEM TECH
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