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A kind of preparation method of crystalline polyester resin and its application on powder coating
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A technology of crystalline polyester resin and powder coatings, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems that cannot be met at the same time, is difficult to meet at the same time, and cannot meet performance requirements, so as to maintain storage stability, Reduces the occurrence of coating surface defects and enhances workability
Active Publication Date: 2016-03-09
ANHUI SHENJIAN NEW MATERIALS
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Problems solved by technology
At present, polyesters in the powder coating polyester market are generally amorphous, and amorphous polyesters can meet the general performance requirements of powder coatings. However, as the market requires higher and higher performance requirements for powder coating polyesters, Amorphous polyesters can no longer meet the increasing performance requirements of the current powder coatings market
From the perspective of amorphous polyester, some performance requirements are contradictory and almost impossible to meet at the same time, or difficult to meet at the same time, such as storage stability and coating leveling, as well as excellent mechanical properties. For amorphous For polyester, these are conflicting requirements
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[0023] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 110°C, wait for the alcohol to completely melt, stir at a speed of 130r / min, then put the formula amount of acid and esterification catalyst, heat up to 180°C, / 30min heating rate to 220°C, maintain acid value 5mgKOH / g;
[0024] The second stage: cool down to 170°C, put in acid, raise the temperature to 220°C, and maintain the acid value at 44mgKOH / g;
[0025] The third stage: cooling down to 200°C and vacuuming, the vacuum degree is -0.09MPa, and the acid value is maintained at 31mgKOH / g.
[0028] The first stage: Put the formula amount of alcohol into the reaction kettle, heat to 125°C, wait for the alcohol to completely melt, stir at a speed of 150r / min, then put the formula amount of acid and esterification catalyst, heat up to 180°C, / 30min heating rate to 235°C, maintain acid value 8mgKOH / g;
[0029] The second stage: cool down to 185°C, put in acid, raise the temperature to 235°C, and maintain the acid value at 48mgKOH / g;
[0030] The third stage: cooling down to 215°C and vacuuming, the vacuum degree is -0.1MPa, and the acid value is maintained at 35mgKOH / g.
Embodiment 3
[0032] Preparation of crystalline polyester resin:
[0033] 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 180°C, / 30min heating rate to 225°C, maintaining an acid value of 6mgKOH / g;
[0034] The second stage: cool down to 175°C, put in acid, raise the temperature to 225°C, and maintain the acid value at 45mgKOH / g;
[0035] The third stage: cooling down to 205°C and vacuuming, the vacuum degree is -0.095MPa, and the acid value is maintained at 32mgKOH / g.
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Abstract
The invention discloses a preparation method of crystalline polyester resin. The preparation method includes three stages, wherein the first stage comprises the steps of: putting a formula amount of alcohol into a reaction kettle, heating to 110-125 degrees centigrade, stirring at a rotating speed of 130-150 r / min after the alcohol is completely melted, then adding the formula amount of an acid and an esterification catalyst, heating to 180 degrees centigrade, and subsequently heating to 220-235 degrees centigrade at a temperature increase speed of 5 degrees centigrade / min; the second stage comprises the steps of: cooling to 170-185 degrees centigrade, adding the acid, and heating to 220-235 degrees centigrade; the third stage comprises the steps of: cooling to 200-215 degrees centigrade, and vacuumizing at a vacuum degree from -0.09 to -0.1 MPa. The invention further discloses application of the prepared crystalline polyester resin to a powdercoating. The crystalline polyester provided by the invention has a good levelling property, a high storage stability and a high processibility; the leveling property of the powdercoating is greatly improved; the coating is flat, smooth and relatively high in glossiness. The aspects of the impact resistance, the adhesive force, the hardness, the weather resistance and the like are all improved.
Description
technical field [0001] The invention relates to a preparation method and application of building materials, in particular to a preparation method of crystalline polyester resin and its application in powder coatings, belonging to the field of coatings industry. Background technique [0002] With the rapid development of powder coatings in recent years, more and more new powder coating application fields have emerged, which put forward higher and more detailed requirements for the performance of powder coatings. At present, polyesters in the powder coating polyester market are generally amorphous, and amorphous polyesters can meet the general performance requirements of powder coatings. However, as the market requires higher and higher performance requirements for powder coating polyesters, Amorphous polyesters are no longer able to meet the increasing performance requirements of today's powder coatings market. From the perspective of amorphous polyester, some performance re...
Claims
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Application Information
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