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Polyurethane-amino resin modified waterborne alkyd resin and preparation and application thereof

A technology of amino resin modification and water-based alkyd resin, which is applied in the field of coatings. It can solve the problems of poor storage stability, slow drying of paint films, and restrictions on amino baking varnishes. It achieves high formula adjustability, reduced surface energy, and increased The effect of hydrophobicity

Inactive Publication Date: 2015-12-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, alkyd resins have some disadvantages: slow drying of the paint film, low hardness, poor water resistance, poor corrosion resistance, poor weather resistance, etc., and there are also disadvantages of poor storage stability for water-based alkyd resins.
Since the polyurethane alkyd resin prepared by this method is oily, it does not conform to the theme of green chemical industry
Secondly, if it is made into water-based polyurethane alkyd resin, since the solvent of this system is basically only water, there is still a compatibility problem with amino resin blending modification, which limits the direction of this type of amino baking varnish to water-based development of

Method used

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  • Polyurethane-amino resin modified waterborne alkyd resin and preparation and application thereof
  • Polyurethane-amino resin modified waterborne alkyd resin and preparation and application thereof
  • Polyurethane-amino resin modified waterborne alkyd resin and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Alcoholysis: When a condensation tube, a thermometer, an agitator are installed and there is nitrogen (N 2 ) protected four-neck flask, add 31.5g dehydrated castor oil and 14.6g trimethylolpropane, slowly heat up to 120°C, add 0.04g lithium hydroxide, then slowly raise the temperature to 240°C, and keep it warm for 1 hour; When the tolerance of the ethanol solution with a mass concentration of 87% reaches 1:3, start to cool down;

[0065] (2) Esterification: Cool down to 140°C, add 11.5g of phthalic anhydride and 5.8g of isophthalic acid, add 10.5g of xylene as a reflux solvent to remove the water generated by esterification, and continue heating at 180°C Keep it warm for 1 hour, then raise the temperature from 15°C to 240°C every 20 minutes, then keep it warm for 1 hour; when the acid value of the system is about 10mgKOH﹒ g -1 When, stop heating, begin to cool down, make alkyd polyol prepolymer;

[0066] (3) Polyurethane modification: cool down to 75°C, add 30.4...

Embodiment 2

[0074] (1) Alcoholysis: When a condensation tube, a thermometer, an agitator are installed and there is nitrogen (N 2 ) protected four-neck flask, add 23.8g linseed oil and 10.8g trimethylolpropane, when the temperature is slowly raised to 120°C, add 0.03g lithium hydroxide, then slowly raise the temperature to 240°C, and keep the temperature for 1 hour; When the tolerance of the ethanol solution with a mass concentration of 87% reaches 1:3, start to cool down;

[0075] (2) Esterification: When the temperature is lowered to 140°C, add 10.2g of phthalic anhydride and 8g of xylene as a reflux solvent to remove the water generated by esterification, continue heating, and keep warm at 180°C for 1 hour, and then every 20min After raising the temperature from 15°C to 240°C, keep it warm for 1 hour; when the acid value of the system is about 10mgKOH﹒ g -1 When, stop heating, begin to cool down, make alkyd polyol prepolymer;

[0076] (3) Polyurethane modification: when the temperat...

Embodiment 3

[0082] (1) Alcoholysis: When a condensation tube, a thermometer, an agitator are installed and there is nitrogen (N 2 ) protected four-neck flask, add 23.8g linseed oil and 10.8g trimethylolpropane, when the temperature is slowly raised to 120°C, add 0.03g lithium hydroxide, then slowly raise the temperature to 240°C, and keep the temperature for 1 hour; When the tolerance of the ethanol solution with a mass concentration of 87% reaches 1:3, start to cool down;

[0083] (2) Esterification: When the temperature is lowered to 140°C, add 10.2g of phthalic anhydride and 8g of xylene as a reflux solvent to remove the water generated by esterification, continue heating, and keep warm at 180°C for 1 hour, and then every 20min After raising the temperature from 15°C to 240°C, keep it warm for 1 hour; when the acid value of the system is about 10mgKOH﹒ g -1 When, stop heating, begin to cool down, make alkyd polyol prepolymer;

[0084] (3) Polyurethane modification: when the temperat...

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Abstract

The invention belongs to the technical field of coatings, and discloses polyurethane-amino resin modified waterborne alkyd resin and preparation and application thereof. The resin is prepared from, by mass, 23.8-31.5 parts of vegetable oil, 10-14.6 parts of polyhydric alcohol, 10-17.3 parts of polyatomic acid, 0.03-0.05 part of alcoholysis catalyst, 24-30.4 parts of diisocyanate, 0.03-0.09 part of dibutyltin dilaurate, 1-4 parts of 1,4-butanediol, 3-7 parts of 2,2-dihydromethyl propionic acid, 1.6-8 parts of amino resin, 0.25-1.25 parts of p-toluenesulfonic acid, 2-6 parts of neutralizer and 1.2-1.9 parts of micromolecular chain extender. The vegetable oil is used as the raw material, and the amino resin is introduced through chemical modification, so that the obtained waterborne alkyd resin is low in cost, the hardness, water resistance, solvent resistance, heat resistance and tensile strength of a resin paint film are improved, and the application prospects are good.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a polyurethane-amino resin modified water-based alkyd resin and its preparation and application. Background technique [0002] Alkyd resin has abundant sources of raw materials, low price and excellent performance, so it has been widely used in the coating industry and is one of the largest synthetic resins in my country. In addition, alkyd resin has a long history of development, and the synthesis process is very stable. The molecule contains a large number of active groups such as hydroxyl, carboxyl, and carbon-carbon double bonds. It has very good modification potential and is widely used in wood varnishes and metal baking varnishes. . However, alkyd resins have some disadvantages: slow drying of the paint film, low hardness, poor water resistance, poor corrosion resistance, poor weather resistance, etc., and there are also disadvantages of poor storage stability...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/75C08G18/76C08G18/68C08G18/32C08G18/34C08G18/54C09D175/14
CPCC08G18/0823C08G18/12C08G18/3206C08G18/348C08G18/544C08G18/683C08G18/755C08G18/7614C09D175/14C08G18/3228
Inventor 夏正斌欧灿斌张燕红
Owner SOUTH CHINA UNIV OF TECH
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