Low-cost, pinhole-resistant and high-hardness polyester resin for HAA system and preparation method of polyester resin

A polyester resin and system technology, used in the field of preparing powder coatings, can solve the problems of difficult to control the degree of reaction, low softening point of polyester resin, fast reaction speed, etc., and achieve outstanding pinhole resistance, good storage stability, and reduced effect of dosage

Active Publication Date: 2022-03-15
HUANGSHAN HUIZHOU KANGJIA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still has obvious deficiencies. First, the cost is relatively high. The price of hexamethylene diisocyanate is generally more than 100,000 / ton, which is far higher than the main carboxyl raw materials of polyester resins such as terephthalic acid and Isophthalic acid, etc., the price of such raw materials is generally 5000-7000 yuan / ton, which greatly increases the cost of polyester resin; secondly, due to the fast reaction speed and the degree of reaction Difficult to control, free hexamethylene diisocyanate will remain in polyester products, resulting in a low softening point of the final polyester resin, generally below 90°C, with extremely poor storage stability, and it is difficult to meet normal storage requirements, such as 40 ℃ / 90 days without agglomeration, which brings more difficult difficulties to downstream applications, especially in summer

Method used

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  • Low-cost, pinhole-resistant and high-hardness polyester resin for HAA system and preparation method of polyester resin
  • Low-cost, pinhole-resistant and high-hardness polyester resin for HAA system and preparation method of polyester resin
  • Low-cost, pinhole-resistant and high-hardness polyester resin for HAA system and preparation method of polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A low-cost, pinhole-resistant, high-hardness type polyester resin for HAA systems, based on the total amount of raw materials for preparing the polyester resin, it includes the following raw material components in molar percentages:

[0023]

[0024]

[0025] The hydroxyl value of Span-80 is 190-210 mgKOH / g, purchased from Jiangsu Haian Petrochemical Plant.

[0026] In addition, it further includes a catalyst monobutyl tin oxide, the amount of which is 0.1% of the total molar weight of raw materials; antioxidant 1010 (tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) ] Pentaerythritol ester), consumption is 0.1% of the total molar weight of raw materials.

[0027] A method for preparing the polyester resin for the above-mentioned HAA system, comprising the steps of:

[0028] A. Add the catalyst and HAA curing agent in the formula amount into the reaction kettle, and fully melt at 138°C;

[0029] B. Then add the formulated amount of terephthalic acid and adipic acid in...

Embodiment 2

[0036] A low-cost, pinhole-resistant, high-hardness type polyester resin for HAA systems, based on the total amount of raw materials for preparing the polyester resin, it includes the following raw material components in molar percentages:

[0037]

[0038] The hydroxyl value of Span-80 is 190-210 mgKOH / g, purchased from Jiangsu Haian Petrochemical Plant.

[0039] It also further includes catalyst monobutyl tin oxide, and the consumption is 0.15% of the total molar weight of raw materials; ester), consumption is 0.2% of the total molar weight of raw materials.

[0040] A method for preparing the polyester resin for the above-mentioned HAA system, comprising the steps of:

[0041] A. Add the amount of catalyst and HAA curing agent into the reaction kettle, and fully melt at 139°C;

[0042] B. Then add the formulated amount of terephthalic acid and adipic acid into the reaction kettle, and gradually raise the temperature to 180°C under the protection of nitrogen, and contro...

Embodiment 3

[0049] A low-cost, pinhole-resistant, high-hardness type polyester resin for HAA systems, based on the total amount of raw materials for preparing the polyester resin, it includes the following raw material components in molar percentages:

[0050]

[0051] The hydroxyl value of Span-80 is 190-210 mgKOH / g, purchased from Jiangsu Haian Petrochemical Plant.

[0052] It also further includes catalyst monobutyl tin oxide, and the consumption is 0.1% of the total molar weight of raw materials; antioxidant 1010 (tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester), consumption is 0.2% of the total molar weight of raw materials.

[0053] A method for preparing the polyester resin for the above-mentioned HAA system, comprising the steps of:

[0054] A. Add the catalyst and HAA curing agent in the formula amount into the reaction kettle, and fully melt at 138°C;

[0055] B. Then add the formulated amount of terephthalic acid and adipic acid into the r...

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Abstract

The invention relates to the technical field of powder coatings, in particular to a low-cost, pinhole-resistant and high-hardness polyester resin for an HAA system and a preparation method of the polyester resin. An HAA curing agent, terephthalic acid, adipic acid, ethylene glycol, 1, 4-butanediol, sorbitan fatty acid ester span-80 and glutaric anhydride are mainly used as raw materials for polymerization; and finally, a coating film with relatively good leveling property can be obtained. The acid value of the polyester resin is 8-12 mgKOH / g and is far lower than that of common HAA curing polyester resin, so that the use amount of an HAA curing agent is greatly reduced during subsequent preparation of a powder coating, the pinhole resistance of a final coating film is outstanding, and the cost is extremely low; and moreover, rapid curing can be realized, energy is saved, and various properties are relatively good and meet the use requirements of the polyester resin powder coating.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, and in particular relates to a low-cost, pinhole-resistant, high-hardness polyester resin for HAA systems, a preparation method thereof, and an application thereof for preparing powder coatings. Background technique [0002] Powder coating is a 100% solid powder that does not contain organic solvents. It is different from oil-based paints and water-based paints. It does not use solvent or water as a dispersion medium when coating, but uses air as a dispersion medium to evenly coat the workpiece. The surface is a new type of environmentally friendly paint that forms a special-purpose coating film after heating. Powder coating has the advantages of no VOC, environmental protection, energy saving, high construction efficiency and wide application range. With its advantages of economy, environmental protection, high efficiency and excellent performance, it is gradually replacing organic solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C08G63/78C09D167/02C09D5/03
CPCC08G63/6856C08G63/78C09D167/02C09D5/03
Inventor 吴泽凯周勇洪昭武汪利华谭卫东李海云
Owner HUANGSHAN HUIZHOU KANGJIA CHEM CO LTD
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