Polyurethane-organosilicon modified waterborne alkyd resin, and preparation method and application thereof

A water-based alkyd resin, silicone technology, applied in polyester coatings, coatings, etc., can solve the problems of poor compatibility between silicone and alkyd resin, poor storage stability, slow drying of paint films, etc. Good mechanical properties, good storage stability, and the effect of improving dryness

Inactive Publication Date: 2016-01-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alkyd resin molecular structure contains more hydroxyl groups and ester groups, so that its paint film performance has some shortcomings: slow drying of the paint film, low hardness, poor water resistance, poor weather resistance, etc.; for water-based alkyd resins, There are also disadvantages of poor storage stability
However, due to the poor compatibility between silicone and alkyd resin, and its modification uses silicone monomers, a large number of easily hydrolyzed Si-O-C bonds are generated, so this silicone monomer modified water-based alcohol Acid resin has the disadvantage of poor stability

Method used

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  • Polyurethane-organosilicon modified waterborne alkyd resin, and preparation method and application thereof
  • Polyurethane-organosilicon modified waterborne alkyd resin, and preparation method and application thereof
  • Polyurethane-organosilicon modified waterborne alkyd resin, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Alcoholysis: When a condensation tube, a thermometer, an agitator are installed and there is nitrogen (N 2 ) protected four-neck flask, add 26.8g linseed oil and 10.2g trimethylolpropane, add 0.03g lithium hydroxide, then increase the temperature to 240 ° C, keep warm for 1 hour, and now the mass concentration is 87% ethanol When the tolerance of the solution reaches 1:3, start to cool down;

[0049] (2) Esterification: add 13.9g of phthalic anhydride, add 8g of xylene as a reflux solvent to remove the water generated by esterification, continue heating, keep it at 180°C for 1 hour, and then increase the temperature by 15°C every 20 minutes After heating up to 240°C, keep it warm until the acid value of the system is about 10mgKOH﹒ g -1 When, stop heating, begin to cool down, make alkyd polyol prepolymer;

[0050] (3) Polyurethane modification: cool down to 75°C, add 25.3g of isophorone diisocyanate (IPDI) and 0.08g of dibutyltin dilaurate, react for 1.5 hours, a...

Embodiment 2

[0058] (1) Alcoholysis: When a condensation tube, a thermometer, an agitator are installed and there is nitrogen (N 2 ) protected four-neck flask, add 22.3g soybean oil and 10.8g pentaerythritol, add 0.03g lithium hydroxide, then increase the temperature to 240 ° C, keep warm for 1 hour, at this time the tolerance of the ethanol solution with a mass concentration of 87% reaches 1:3, start to cool down;

[0059] (2) Esterification: add 10.2g of phthalic anhydride, 4.2g of maleic anhydride, add 8g of xylene as a reflux solvent to remove the water generated by esterification, continue heating, keep warm at 180°C for 1 hour, and then Raise the temperature at a rate of 15°C in 20 minutes to 240°C, and keep it warm until the acid value of the system is about 10mgKOH﹒ g -1 When, stop heating, begin to cool down, make alkyd polyol prepolymer;

[0060] (3) Polyurethane modification: when the temperature is lowered to 75°C, add 24.5g toluene diisocyanate (TDI) and 0.08g dibutyltin di...

Embodiment 3

[0065] (1) Alcoholysis: When a condensation tube, a thermometer, an agitator are installed and there is nitrogen (N 2 ) protected four-neck flask, add 30.2g tung oil, 6.2g 2,2-trimethylolpropane, 7.8g pentaerythritol, add 0.03g lithium hydroxide, then raise the temperature to 240°C, keep it warm for 1 hour, at this time the mass The tolerance of the ethanol solution with a concentration of 87% reaches 1:3, and the temperature starts to drop;

[0066] (2) Esterification: Add 12.5g of phthalic anhydride, add 8g of xylene as a reflux solvent to remove the water generated by esterification, continue heating, keep it at 180°C for 1 hour, and then increase the temperature by 15°C every 20 minutes After the temperature is raised to 240°C, keep it warm until the acid value of the system is about 10mgKOH. g -1 When, stop heating, begin to cool down, make alkyd polyol prepolymer;

[0067] (3) Polyurethane modification: cool down to 75°C, add 24.6g of isophorone diisocyanate (IPDI) an...

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Abstract

The invention relates to the technical field of chemical engineering, and discloses polyurethane-organosilicon modified waterborne alkyd resin and a preparation method and an application thereof. The polyurethane-organosilicon modified waterborne alkyd resin is composed of the following components, by weight: 26-36 parts of vegetable oil, 8-15 parts of polyol, 12-18 parts of polyacid, 0.03-0.05 parts of an alcoholysis catalyst, 25-32 parts of diisocyanate, 0.03-0.09 parts of dibutyltin dilaurate, 1-12 parts of hydroxyl silicone oil, 1-4 parts of 1,4-butanediol, 3-7 parts of 2,2-dimethylol propionic acid, 2-6 parts of a neutralizing agent, and 1.2-1.9 parts of a small-molecular chain extender. The resin provided by the invention is used for preparing a paint film. The prepared paint film has the advantages of easy construction, high gloss, full paint film, good thermal stability, water resistance, low surface energy, and good mechanical performance.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a polyurethane-organosilicon modified water-based alkyd resin, a preparation method and an application. Background technique [0002] Alkyd resin is a synthetic resin widely used in the coating industry, and it is also one of the largest synthetic resins in my country. It has the advantages of cheap price, simple synthesis process, rich source of raw materials, simple construction, good miscibility, good wettability and dispersibility to pigments and fillers, and is widely used in wood varnishes, anti-corrosion primers, metal baking varnishes, etc. However, the alkyd resin molecular structure contains more hydroxyl groups and ester groups, so that its paint film performance has some shortcomings: slow drying of the paint film, low hardness, poor water resistance, poor weather resistance, etc.; for water-based alkyd resins, There is also the disadvantage of poor storage s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/695C08G63/685C08G63/49C09D167/08
Inventor 夏正斌欧灿斌陈海洪
Owner SOUTH CHINA UNIV OF TECH
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