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A kind of high leveling polyester resin and its preparation method application

A technology of polyester resin and flat polyester, which is used in the preparation of HAA system powder coatings and high leveling polyester resins. It can solve the problems of difficult to obtain high leveling coating film and insufficient leveling of the coating film surface, and achieve long gelation time. , good fluidity, soft chain effect

Active Publication Date: 2020-07-31
黄山嘉恒科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in ordinary HAA powder coatings, due to the high functionality of the HAA curing agent, high curing activity, and fast curing speed, this will lead to insufficient leveling of the coating film surface of the powder coating, and it is difficult to obtain high leveling. Coating film, which has also become a technical problem that limits the development of HAA system powder coatings

Method used

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  • A kind of high leveling polyester resin and its preparation method application
  • A kind of high leveling polyester resin and its preparation method application
  • A kind of high leveling polyester resin and its preparation method application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The high-leveling polyester resin described in this embodiment, based on the total amount of the polyester resin, the preparation raw materials include the following raw material components in mole percentages:

[0028]

[0029]

[0030] Wherein, the citric acid monoester compound is a compound obtained by esterifying a hydroxyl group in a citric acid molecule with acrylic acid, and has the following structure: a compound obtained by esterifying a hydroxyl group in a citric acid molecule with acrylic acid, and has the following structure Structure shown:

[0031]

[0032] Dissolve citric acid and acrylic acid in toluene solvent according to the molar ratio of 1:3, add concentrated sulfuric acid accounting for 0.5-1.5wt% of the total molar amount of raw materials as a catalyst, and control the temperature to be 108-115 ℃ to carry out esterification reaction with water for 2-6h , and then the toluene solvent and excess acrylic acid are removed by distillation und...

Embodiment 2

[0040] The high-leveling polyester resin, based on the total amount of the polyester resin, has the following raw material components in mole percentages:

[0041]

[0042] The structure and preparation method of the citric acid monoester compound described in this example are the same as those in Example 1.

[0043] The preparation method of the high-leveling polyester resin described in this example is the same as that in Example 1.

[0044] After testing, the acid value of the polyester resin prepared in this example is 30 mgKOH / g, and the softening point is 102°C.

Embodiment 3

[0046] The high-leveling polyester resin, based on the total amount of the polyester resin, has the following raw material components in mole percentages:

[0047]

[0048]

[0049] The structure and preparation method of the citric acid monoester compound described in this example are the same as those in Example 1.

[0050] The preparation method of the high-leveling polyester resin described in this example is the same as that in Example 1.

[0051] After testing, the acid value of the polyester resin prepared in this example was 28 mgKOH / g, and the softening point was 113°C.

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Abstract

The invention belongs to the technical field of powder coating, particularly relates to high-leveling polyester resin, and further discloses a preparation method of the high-leveling polyester resin and application of the high-leveling polyester resin to preparation of HAA system powder coating. The high-leveling polyester resin provided by the invention is formed through copolymerization of diethyl phenyl malonate, a citrate monoester compound, diglycolic acid, thiodiglycol, octyl glycerol, neopentyl glycol and hexahydrophthalic anhydride. The high-leveling polyester resin, has a soft chain segment, high molten state flowability and low high-temperature viscosity, and can be applied to preparation of HAA curing system powder coating.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, and in particular relates to a high-leveling polyester resin, and further discloses a preparation method thereof and its use for preparing HAA system powder coatings. Background technique [0002] Powder coating is a 100% solid powder that does not contain organic solvents. It is different from oil-based coatings and water-based coatings. It does not use solvent or water as a dispersion medium, but air as a dispersion medium, which is evenly coated on the workpiece. A new type of environmentally friendly coating that forms a layer of coating film with special purposes after heating. Powder coatings have the advantages of no VOC, environmental protection, energy saving, high construction efficiency and wide application range. With their advantages of economy, environmental protection, high efficiency and excellent performance, they are gradually replacing organic solvent-based coatings and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/698C08G63/85C09D167/06C09D5/03
CPCC08G63/6988C08G63/85C09D5/03C09D167/06
Inventor 汪云端梁优莲王明良王永垒
Owner 黄山嘉恒科技有限公司
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