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Hydroxyl polyester resin for high-gloss powder coating, and preparation method and application thereof

A polyester resin and powder coating technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of affecting gloss performance, difficulty, and reducing the gloss of the final coating film

Active Publication Date: 2019-01-11
安徽恒隆新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain high leveling performance, it is required that the viscosity of polyester resin as the key material of powder coating should be low, but the viscosity is too low to affect the mechanical properties of the resin; on the other hand, in order to have qualified storage stability, polyester resin for powder coating is required The glass transition temperature of the resin must be above 50°C, and the weather-resistant polyester must even reach above 60°C. However, if the glass transition temperature is too high, the melt flow temperature of the resin will also increase accordingly, which will affect its leveling property and cause it to deteriorate. affect the gloss properties
[0005] In addition, because the hydroxyl polyester curing agent is mostly blocked isocyanate curing agent B1530, after the curing agent is unblocked at 200°C, its activity is very high, and the curing speed with hydroxyl polyester is fast, resulting in a longer gel time of the coating film. Short, so that the apparent leveling is insufficient, the surface gloss of the coating film is not satisfactory; at the same time, because the blocked isocyanate curing agent B1530 is blocked by caprolactam, the caprolactam remains in the coating film after unblocking, due to the combination of caprolactam and the coating film Insufficient compatibility of the resin component polyester resin will also reduce the gloss of the final coating film
Therefore, it is very difficult to obtain high gloss (above 95%) for powder coating products for the existing B1530 system

Method used

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  • Hydroxyl polyester resin for high-gloss powder coating, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The hydroxyl polyester resin for high-gloss powder coatings described in this embodiment, based on the total amount of raw materials for preparing the hydroxyl polyester resin, includes the following raw material components in molar percentages:

[0043] Terephthalic acid 21mol;

[0044] 6-aminocaproic acid 12mol;

[0045] Domoic acid 10mol;

[0046] 3,6-dithia-1,8-octanediol 17mol;

[0047] 2-Acrylic acid-2,18-dihydroxy-4,7,10,13,16-pentaoxanonadecane-1,19-diyl ester 10mol;

[0048] Neopentyl glycol 12mol;

[0049] 3-(2,3-epoxypropoxy)propyltrimethoxysilane 6mol;

[0050] 3,5-di-tert-butyl-4-hydroxybenzyl alcohol 12mol;

[0051] Dimethyl tin oxide 0.3mol;

[0052] Antioxidant 300 0.2mol.

[0053] The method for preparing high-gloss powder coating hydroxy polyester resin described in the present embodiment may further comprise the steps:

[0054] (1) Take a selected amount of the 3,6-dithia-1,8-octanediol, 2-acrylic acid-2,18-dihydroxy-4,7,10,13,16-pentoxadecyl M...

Embodiment 2

[0061] The hydroxyl polyester resin for high-gloss powder coatings described in this embodiment, based on the total amount of raw materials for preparing the hydroxyl polyester resin, includes the following raw material components in molar percentages:

[0062] Terephthalic acid 25mol;

[0063] 6-aminocaproic acid 15mol;

[0064] Domoic acid 5mol;

[0065] 3,6-dithia-1,8-octanediol 16mol;

[0066] 2-Acrylic acid-2,18-dihydroxy-4,7,10,13,16-pentaoxanonadecane-1,19-diyl ester 6mol;

[0067] Neopentyl glycol 15mol;

[0068] 3-(2,3-epoxypropoxy)propyltrimethoxysilane 3mol;

[0069] 3,5-di-tert-butyl-4-hydroxybenzyl alcohol 15mol;

[0070] Dimethyl tin oxide 0.1mol;

[0071] Antioxidant 300 0.5mol.

[0072] The method for preparing the hydroxyl polyester resin for high-gloss powder coatings described in this example is the same as that in Example 1.

[0073] After testing, the hydroxyl value of the hydroxyl polyester resin prepared in this example is 44 mgKOH / g, the softeni...

Embodiment 3

[0075] The hydroxyl polyester resin for high-gloss powder coatings described in this embodiment, based on the total amount of raw materials for preparing the hydroxyl polyester resin, includes the following raw material components in molar percentages:

[0076] Terephthalic acid 25mol;

[0077] 5mol of 6-aminocaproic acid;

[0078] Domoic acid 12mol;

[0079] 3,6-dithia-1,8-octanediol 18mol;

[0080] 2-Acrylic acid-2,18-dihydroxy-4,7,10,13,16-pentaoxanonadecane-1,19-diyl ester 12mol;

[0081] Neopentyl glycol 15mol;

[0082] 3-(2,3-epoxypropoxy)propyltrimethoxysilane 8mol;

[0083] 3,5-di-tert-butyl-4-hydroxybenzyl alcohol 5mol;

[0084] Dimethyl tin oxide 0.4mol;

[0085] Antioxidant 300 0.2mol.

[0086] The method for preparing the hydroxyl polyester resin for high-gloss powder coatings described in this example is the same as that in Example 1.

[0087] After testing, the hydroxyl value of the hydroxyl polyester resin prepared in this example is 32 mgKOH / g, the soft...

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Abstract

The invention specifically relates to hydroxy polyester resin for a high-gloss powder coating, a preparation method thereof and application of the hydroxy polyester resin to powder coatings, belongingto the technical field of powder coatings. The hydroxy polyester resin for the high-gloss powder coating is prepared through polymerization of the following raw materials: terephthalic acid, 6-aminocaproic acid, domoic acid, 3,6-dithia-1,8-octanediol, 2-propenoic acid-2,18-dihydroxy-4,7,10,13,16-pentaoxanonadecane-1,19-diyl ester, neopentyl glycol, 3-(2,3-epoxypropoxy)propyl trimethoxy silane and3,5-di-tert-butyl-4-hydroxybenzyl alcohol. It has been determined that the obtained hydroxy polyester resin has good melt fluidity at 200 DEG C, low melt viscosity and long leveling time, and allowsa film to have high gloss. The hydroxy polyester resin is eventually applied to the powder coating cured by polyurethane B1530, can improve the surface gloss of the coating, and allows a coated boardsurface with high gloss to be obtained.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, specifically relates to a polyester resin for high-gloss powder coatings, and further discloses its preparation method and its application 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 solvent-based coatings and has...

Claims

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Application Information

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IPC IPC(8): C08G63/695C08G63/688C08G63/685C09D167/00C09D5/03
CPCC08G63/685C08G63/688C08G63/695C09D5/03C09D167/00
Inventor 叶新栋鲍观良王永垒
Owner 安徽恒隆新材料有限公司
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