High-crystallinity bifunctional polyester resin for low-temperature curing extinction powder coating and synthesis method thereof

A matte powder coating, high crystallinity technology, applied in powder coatings, polyester coatings, coatings, etc., can solve the problems of inability to cure at low temperature, poor mechanical properties, and high matte gloss, and achieve the benefits of matt gloss and reduced melting. Excellent viscosity and mechanical properties

Inactive Publication Date: 2020-06-05
ZHEJIANG GUANGHUA NEW MATERIALS
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is chemical matting or physical matting, there are more or less defects such as high matting gloss, poor mechanical properties, poor fineness, and poor leveling of the board surface, and a perfect balance cannot be achieved.
Chinese patent CN108084415A discloses a carboxyl-hydroxyl-terminated polyester with an acid value of 35-45mgKOH / g, a hydroxyl value of 10-25mgKOH / g, and a melt viscosity of 1000-5000mpa.s at 200°C. It has better leveling and mechanical properties, but its extinction The gloss is only 30%, the efficiency is low, and its curing temperature is 200°C, the energy consumption is high
Chinese patent CN109293905A discloses a bifunctional polyester resin with good matting performance and its preparation method and application. The bifunctional polyester has an acid value of 15-35mgKOH / g, a hydroxyl value of 20-60mgKOH / g, and a viscosity of 4000-5500mpa.s / 200°C, matt gloss 6.6-8.9% / 60°, leveling five plus, mechanical properties positive and negative 50kg.cm, due to its high melt viscosity at 200°C, the resin structure is amorphous, and low temperature curing is not possible And the problem of low temperature curing leveling and high matte gloss
Chinese patent CN103483565A discloses a semi-crystalline polyester resin for TGIC solidified high-leveling powder coatings and its synthesis method. The invention adopts long carbon chain symmetrical alcohol and esterification polycondensation to obtain a semi-crystalline resin. The resin has a melting point of 100-130 °C and a viscosity of 400-3000mPa.s, the prepared powder coating has good leveling and mechanical properties, the polyester does not contain a bifunctional structure, and does not have the conditions for low-temperature curing and matting problems
The results of document retrieval show that the high crystallinity bifunctional polyester resin synthesized by the present invention and its low-temperature curing matting powder field are rarely reported.

Method used

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  • High-crystallinity bifunctional polyester resin for low-temperature curing extinction powder coating and synthesis method thereof
  • High-crystallinity bifunctional polyester resin for low-temperature curing extinction powder coating and synthesis method thereof
  • High-crystallinity bifunctional polyester resin for low-temperature curing extinction powder coating and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] 1. A high-crystallinity bifunctional polyester resin for low-temperature curing matting powder coatings, which has the following raw materials in parts by mass: 1,6-hexanediol 47.9g, terephthalic acid 45.5g, adipic acid 21.1g, zirconium 0.86g of n-propyl acid, 0.55g of phosphorous acid, 60.25g of 18-crown ether, and 0.46g of methyltriethylammonium chloride.

[0033] 2. A kind of high crystallinity bifunctional polyester resin for low-temperature curing matting powder coating, its preparation process is as follows:

[0034] (1) Feeding: According to the formula quantity, put the alcohol into the reaction kettle successively, and stir, heat and melt until the temperature of the material is greater than 60°C, slowly add the acid and catalyst, and heat up.

[0035] (2) Heating esterification: During esterification, the temperature at the top of the tower is controlled to be ≤102°C, and the temperature is raised from 70°C to 170°C at a rate of 8°C / 10min, and then to 220°C at...

Embodiment 2

[0040] 1. A high-crystallinity bifunctional polyester resin for low-temperature curing matting powder coatings, which has the following raw materials in parts by mass: 1,6-hexanediol 37.1g, terephthalic acid dimethanol 5.1g, 1,4-butanediol 5.1g, 51.1g of terephthalic acid, 16.2g of adipic acid, 0.86g of n-propyl zirconate, 0.75g of phosphorous acid, 50.35g of 15-crown ether, and 0.26g of tetrabutylammonium chloride.

[0041] 2. A kind of high crystallinity bifunctional polyester resin for low-temperature curing matting powder coating, its preparation process is as follows:

[0042] (1) Feeding: According to the formula quantity, put the alcohol into the reaction kettle successively, and stir, heat and melt until the temperature of the material is greater than 60°C, slowly add the acid and catalyst, and heat up.

[0043] (2) Heating esterification: During esterification, the temperature at the top of the tower is controlled to be ≤102°C, and the temperature is raised from 70°C ...

Embodiment 3

[0048] 1. A high crystallinity bifunctional polyester resin for low-temperature curing matting powder coatings, which has the following parts by mass of raw materials: 1,6-hexanediol 39.1g, ethylene glycol 5.4g, terephthalic acid 48.1g, hexane 17.1 g of diacid, 5.4 g of lauric acid, 0.66 g of isopropyl zirconate, 0.68 g of phosphorous acid, 60.34 g of 18-crown ether, and 0.38 g of benzyltrimethylammonium chloride.

[0049] 2. A kind of high crystallinity bifunctional polyester resin for low-temperature curing matting powder coating, its preparation process is as follows:

[0050] (1) Feeding: According to the formula quantity, put the alcohol into the reaction kettle successively, and stir, heat and melt until the temperature of the material is greater than 60°C, slowly add the acid and catalyst, and heat up.

[0051] (2) Heating esterification: During esterification, the temperature at the top of the tower is controlled to be ≤102°C, and the temperature is raised from 70°C to...

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Abstract

The invention discloses high-crystallinity bifunctional polyester resin for low-temperature curing extinction powder coating and a synthesis method thereof. The high-crystallinity bifunctional polyester is synthesized by adopting an esterification polycondensation two-step method and a vacuum process; wherein terephthalic acid, adipic acid and 1,6-hexanediol which are symmetrical are adopted as main bodies, the melting point, viscosity and crystallinity of the system are controlled through other monomers of dihydric alcohol and binary acid with even number of carbon atoms; the dosage of each monomer is adjusted; the molar ratio of total carboxyl to total hydroxyl of the system is controlled, and the high-crystallinity bifunctional polyester resin is synthesized; the acid value of the prepared polyester resin is 30-36 mgKOH/g, the hydroxyl value is 18-23 mgKOH/g, the viscosity is 3000-6000 mPa.s/160 DEG C, and the melting point is 90-120 DEG C. The preparation method has the advantagesof simple synthesis process, short time consumption and economic production cost, and the prepared polyester is used for 170 DEG C curing of TGIC-B1530 double-system powder, and has excellent extinction performance, fine plate surface, excellent leveling performance and excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of powder coatings, in particular to a high-crystallinity bifunctional polyester resin for low-temperature curing matting powder coatings and a synthesis method thereof. Background technique [0002] With the upgrading of environmental protection requirements, the application fields of powder coatings are constantly being expanded, and polyester resin, the main raw material that determines the performance of powder coatings, has also been greatly developed. However, high-gloss bright powder coatings are more harmful to eyes due to serious reflection after film formation. Therefore, matte powder coatings are attracting more and more attention from the market because of their natural, elegant, and concealable paint film defects. The principle of matting powder is to destroy the uniformity and continuity of the coating film by chemical or physical methods, so that the light irradiates on the surface of the pain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C09D5/03C09D7/61C09D7/63
CPCC08G63/183C09D5/032C09D167/02C09D5/033C08K2003/2241C08K13/02C08K3/22C08K3/04
Inventor 许国徽贾林孙杰风褚海涛虞振宇
Owner ZHEJIANG GUANGHUA NEW MATERIALS
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