Hydroxyl-terminated water-based polyester resin and preparation method thereof

A hydroxyl-terminated water-based polyester resin technology, used in polyester coatings, coatings, etc., can solve the problems of easy hydrolysis, poor wear resistance, peeling, etc., achieve excellent water resistance and chemical resistance, simplify processing procedures, The effect of reducing the processing cost

Active Publication Date: 2014-12-10
中山市巴德富化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, water-based polyester resins have two major drawbacks
First, the molecular chain of water-based polyester resin is a flexible molecular chain, but the chemical bonds between the groups are not high, resulting in low hardness and poor wear resistance of the coating film itself
Second, because water-based polyester resin uses water as a dispersion medium, the groups and molecular chains in the coating film are prone to hydrolysis after contact with water, resulting in water whitening, fading, and falling off of the coating film. Very poor chemical and water resistance

Method used

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  • Hydroxyl-terminated water-based polyester resin and preparation method thereof

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preparation example Construction

[0028] The preparation method of hydroxyl-terminated water-based polyester resin of the present invention comprises the following steps:

[0029] a: Weigh the raw materials according to the above ratio for later use;

[0030] b: Add phthalic anhydride, isophthalic acid, adipic acid, tetrahydrophthalic acid, butanediol, neopentyl glycol and trimethylolpropane into a four-necked flask under normal pressure and stir until uniform. A distillation column is arranged on the four-necked flask;

[0031] c: Introduce nitrogen gas into the four-necked flask, and raise the temperature of the mixture to 120-150°C, and the heating time is 0.5-2 hours;

[0032] d: Heat the mixture in step c to 170-190°C at a rate of 0.3-0.6°C / min, keep the temperature of the distillation column below 105°C, and the water yield is between 70-90%.

[0033] e: close the nitrogen, and connect the four-necked flask to the vacuum device;

[0034] f: Heat the mixture obtained in step e to 200-230°C at a rate of...

Embodiment 1

[0041] The hydroxyl-terminated water-based polyester resin of the present invention includes phthalic anhydride, isophthalic acid, adipic acid, tetrahydrophthalic acid, butanediol, neopentyl glycol and trimethylolpropane, and the content of the above components is by mass parts The calculations are: phthalic anhydride: 15 parts; isophthalic acid: 20 parts, adipic acid: 10 parts, tetrahydrophthalic acid: 5 parts, butanediol: 100 parts; neopentyl glycol: 5 parts, Trimethylolpropane: 5 parts. At the same time, ethanol was added into the reaction system as a hydrophilic solvent, and its content was calculated as 80 parts by mass.

[0042] The preparation method of hydroxyl-terminated water-based polyester resin of the present invention comprises the following steps:

[0043] a: Weigh the raw materials according to the above ratio for later use;

[0044] b: Add phthalic anhydride, isophthalic acid, adipic acid, tetrahydrophthalic acid, butanediol, neopentyl glycol and trimethylol...

Embodiment 2

[0054] The hydroxyl-terminated water-based polyester resin of the present invention includes phthalic anhydride, isophthalic acid, adipic acid, tetrahydrophthalic acid, butanediol, neopentyl glycol and trimethylolpropane, and the content of the above components is by mass parts The calculations are: phthalic anhydride: 25 parts; isophthalic acid: 30 parts, adipic acid: 15 parts, tetrahydrophthalic acid: 10 parts, butanediol: 100 parts; neopentyl glycol: 13 parts, Trimethylolpropane: 14 parts. At the same time, methanol was added into the reaction system as a hydrophilic solvent, and its content was calculated as 83 parts by mass.

[0055] The preparation method of hydroxyl-terminated water-based polyester resin of the present invention comprises the following steps:

[0056] a: Weigh the raw materials according to the above ratio for later use;

[0057] b: Add phthalic anhydride, isophthalic acid, adipic acid, tetrahydrophthalic acid, butanediol, neopentyl glycol and trimeth...

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Abstract

The invention discloses hydroxyl-terminated water-based polyester resin. The hydroxyl-terminated water-based polyester resin is characterized by comprising the following components in parts by weight: 15-50 parts of phthalic anhydride, 20-70 parts of isophthalic acid, 10-30 parts of adipic acid, 5-20 parts of tetrahydro phthalic acid, 100 parts of butanediol, 5-30 parts of neopentyl glycol and 5-30 parts of trimethylolpropane. The hydroxyl-terminated water-based polyester resin has high hardness, good wearing resistance, excellent water resistance and chemical resistance.

Description

[0001] technical field [0002] The invention relates to a polyester resin and a preparation method thereof, in particular to a hydroxyl-terminated water-based polyester resin and a preparation method thereof. [0003] Background technique [0004] At present, polyester resin is widely used in fields such as wood lacquer and wood coating. Water-based polyester resin is a kind of polyester resin. Since water is used instead of organic solvent as the dispersion medium to form a resin system, the coating film is formed after the water is drawn out during painting. Water-based polyester resin does not need to use volatile organic solvents. It has the advantages of no toxic chemical substances, non-flammability, and good adhesion to the substrate. Therefore, water-based polyester resin is favored by the majority of users. However, waterborne polyester resins suffer from two major drawbacks. First, the molecular chain of the water-based polyester resin is a flexible molecular c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/78C09D167/00
Inventor 曾庆乐杨文涛
Owner 中山市巴德富化工科技有限公司
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