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High-leveling polyester resin as well as preparation method and application thereof

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 insufficient leveling on the surface of the coating film and difficulty in obtaining a high-leveling coating film, and achieve long gelation time. , good fluidity, soft chain effect

Active Publication Date: 2018-09-04
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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  • High-leveling polyester resin as well as preparation method and application thereof
  • High-leveling polyester resin as well as preparation method and application thereof
  • High-leveling polyester resin as well as preparation method and application thereof

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, its preparation raw materials include the following raw material components in molar 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: The structure shown:

[0031]

[0032] Dissolve citric acid and acrylic acid in toluene solvent at a molar ratio of 1:3, add concentrated sulfuric acid accounting for 0.5-1.5wt% of the total molar weight of raw materials as a catalyst, and control the temperature at 108-115°C for 2-6 hours of esterification with water , and then the toluene solvent and excess acrylic acid were removed by vacuum distillation to obtain the citr...

Embodiment 2

[0040] Described high-leveling polyester resin, based on the total amount of the polyester resin, its preparation raw materials include the following raw material components in molar 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 embodiment is the same as that in Embodiment 1.

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

Embodiment 3

[0046] Described high-leveling polyester resin, based on the total amount of the polyester resin, its preparation raw materials include the following raw material components in molar 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 embodiment is the same as that in Embodiment 1.

[0051] After testing, the acid value of the polyester resin prepared in this example is 28mgKOH / g, and the softening point is 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, specifically relates to a high-leveling polyester resin, and further discloses its preparation method and its application 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 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 solvent-based coatings and has becom...

Claims

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Application Information

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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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