A kind of preparation method for the polyester resin of non-frost type powder coating

A polyester resin, powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve problems affecting the appearance and performance of coatings, and achieve good mechanical properties.

Active Publication Date: 2016-05-11
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The appearance of blooming affects the appearance and performance of the coating

Method used

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  • A kind of preparation method for the polyester resin of non-frost type powder coating
  • A kind of preparation method for the polyester resin of non-frost type powder coating
  • A kind of preparation method for the polyester resin of non-frost type powder coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of frost-free polyester resin:

[0023] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 110°C, wait until the alcohol is completely melted, stir at a speed of 130r / min, then put in the formula amount of acid and esterification catalyst, heat up to 170°C, at 5°C / 30min heating rate to 245°C, maintain acid value 8mgKOH / g;

[0024] The second stage: Add acid and maintain the temperature at 230°C until the reactants are clear, and the acid value is 43mgKOH / g by sampling;

[0025] The third stage: under the condition of 225-235 ℃, the vacuum degree is -0.095--0.097MPa for 1.5-2h, and the acid value, viscosity and glass transition temperature are measured.

Embodiment 2

[0027] Preparation of frost-free polyester resin:

[0028] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 115°C, wait for the alcohol to completely melt, stir at a speed of 135r / min, then put the formula amount of acid and esterification catalyst, heat up to 175°C, / 30min heating rate to 246°C, maintaining an acid value of 9mgKOH / g;

[0029] The second stage: put in acid, maintain the temperature at 232°C, until the reactant is clear, and take a sample to measure the acid value to 44mgKOH / g;

[0030] The third stage: under the condition of 230°C, vacuumize for 1.8h with a vacuum degree of -0.096MPa, and measure the acid value, viscosity, and glass transition temperature.

Embodiment 3

[0032] Preparation of frost-free polyester resin:

[0033] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 120°C, wait for the alcohol to completely melt, stir at a speed of 140r / min, then put the formula amount of acid and esterification catalyst, heat up to 180°C, / 30min heating rate to 247°C, maintaining acid value 10mgKOH / g;

[0034] The second stage: add acid, maintain the temperature at 234 ° C, until the reactant is clear, take a sample and measure the acid value to 45 mgKOH / g;

[0035] The third stage: Under the condition of 235°C, vacuumize for 2 hours with a vacuum degree of -0.097MPa, and measure the acid value, viscosity, and glass transition temperature.

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Abstract

The invention discloses a method for preparing a polyester resin used in a frostless type powder coating. The method comprises the following three stages: 1, feeding alcohol in the formula amount into a reaction kettle, heating up till the alcohol is completely molten, stirring, further feeding acid and an esterification catalyst in the formula amount, raising the temperature to 170-180 DEG C, further raising the temperature to 245-250 DEG C, and maintaining the acid value to 8-12mgKOH / g; 2, feeding acid, keeping the temperature of 230-240 DEG C till a reactant is clear, sampling, measuring the acid value to be 43-47mgKOH / g; 3, vacuuming for 1.5-2 hours till the vacuum degree ranges from -0.095MPa to -0.097MPa, and measuring the acid value. When applied to the powder coating, the polyester prepared by using the method reduces or even avoids the frost phenomenon in comparison with an ordinary polyester powder coating; good leveling property and shock resistance are also maintained and the mechanical property is good.

Description

technical field [0001] The invention relates to a method for preparing building materials, in particular to a method for preparing polyester resin used in frost-free powder coatings, and belongs to the field of paint industry. Background technique [0002] Most of the currently used carboxyl-terminated powder coating polyesters use terephthalic acid (TPA) and neopentyl glycol (NPG) as the main synthetic materials, and then use a small amount of terephthalic acid (IPA) and adipic acid (ADA). ) and ethylene glycol (EG), trimethylolpropane (TMP) and other raw materials are modified to meet the performance requirements of conventional powder coatings. However, with the development of the powder coating industry, the requirements for the performance of powder coatings are getting higher and higher and finer. At the same time, some new problems have also been discovered. For example, during the application of such carboxyl-terminated polyesters in powder coatings, it was found th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/20C08G63/183C08G63/181C08G63/16C08G63/78C09D167/02C09D167/00C09D5/03
Inventor 刘志坚吴德清杨兆攀焦金牛
Owner ANHUI SHENJIAN NEW MATERIALS
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