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60/40 low-gloss polyester resin for powdery coating, and three-kettle combined preparation method thereof

A polyester resin, powder coating technology, applied in powder coatings, polyurea/polyurethane coatings, polyester coatings, etc., can solve problems such as large differences in gloss, limited application, and poor batch stability of powder coatings

Active Publication Date: 2020-01-07
黄山市向荣新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Regarding the products with low coating film gloss, the relatively mature technology is to use the method of dry mixing and matting to prepare the powder coating with ground gloss, as disclosed in CN 201610556134.0, using high acid value polyester resin and low acid value polyester resin respectively After preparing the powder coating, dry mixing according to the proportion can obtain a coating film with a gloss of 20-40%, but it cannot be used to prepare a coating film below 15%
The biggest application problem of this process is that the batch stability of powder coatings is very poor due to the difference in powder mixing uniformity during the dry mixing process, especially the problem of large gloss differences in the same batch of powder coatings, which greatly limits this process. Application of class products

Method used

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  • 60/40 low-gloss polyester resin for powdery coating, and three-kettle combined preparation method thereof
  • 60/40 low-gloss polyester resin for powdery coating, and three-kettle combined preparation method thereof
  • 60/40 low-gloss polyester resin for powdery coating, and three-kettle combined preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The preparation method of the polyester resin that is used for 60 / 40 low light type powder coating, comprises the following steps:

[0043] (1) 3,7-dimethyl-1,7-octanediol, 3-nitrophthalic anhydride, 2,2'-bipyridine-4,4'-dicarboxylic acid ethyl ester and catalyst A Add it into the reaction kettle A, and conduct the esterification reaction at 200°C for 11 hours, stop the reaction when the acid value drops to about 45KOH / g, and obtain the first esterification material;

[0044] (2) Add trimesic acid to the first esterification material, gradually heat up to 240°C at a rate of 5°C / h under nitrogen protection, start the vacuum system, keep the vacuum at about 65mmHg, and keep the temperature for 3h. Stop the reaction when the acid value drops below 120mgKOH / g, cool down to 135°C and keep it warm for later use to obtain polyester material A;

[0045] (3) Add terephthalic acid, diethylene glycol, 1,4-bis(hydroxymethyl)cyclohexane and catalyst B into reaction kettle B, and ca...

Embodiment 6

[0068] After the polyester resin of the present invention is applied to the coating, whether the coating performance can reach the desired expected effect, the inventor has done the following experiments:

[0069] Using the existing 60 / 40 matting powder coating formula, the formula is usually as follows in parts by weight:

[0070]

[0071] The matting agent code-named M-30 was purchased from Anhui Jingcheng New Material Co., Ltd.;

[0072] Paint coating preparation: According to the formula of low-gloss powder paint, mix the materials, extrude, tablet, and crush with a twin-screw extruder, and then crush the flakes and sieve (160 mesh) to make a powder paint. The powder coating is sprayed on the surface-treated tinplate substrate with an electrostatic spray gun, and cured at 180°C / 15min to obtain the coating.

[0073] The determination of acid value is based on GB / T 12008.5-1989 "Determination of Acid Value in Polyether Polyols";

[0074] The test method of epoxy equival...

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Abstract

The invention belongs to the technical field of coatings, particularly relates to a 60 / 40 low-gloss polyester resin for a powdery coating, and further relates to a three-kettle combined preparation method of the polyester resin. The main raw materials of the polyester resin mainly comprise ethyl 2,2'-dipyridine-4,4'-dicarboxylate, terephthalic acid, trimesic acid, 3-nitrophthalic anhydride, adipicacid, neopentyl glycol, 3,7-dimethyl-1,7-octanediol, 1,4-di(hydroxymethyl)cyclohexane, pentaerythritol, diethylene glycol, toluene diisocynate and diglycidyl terephthalate. Three polyester products with different end group structures are respectively prepared by combining three kettles, and then are uniformly melt-blended lately to obtain the uniformly-dispersed mixed 60 / 40 polyester resin product. The powdery coating is prepared from the finally obtained polyester resin, is matched with a small amount of a delustering agent, and then is cured with an E-12 epoxy resin to stably obtain a filmwith the gloss of below 10%.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a polyester resin for 60 / 40 low-gloss type powder coating, and also relates to the above-mentioned preparation method of polyester resin in three-pot combination. Background technique [0002] Ordinary 60 / 40 polyester resin for indoor powder coatings has relatively uniform molecular weight, and the active functional groups in the molecular chain are finally only carboxyl groups, and the activity of carboxyl groups is relatively uniform. When curing with E-12 epoxy, the curing is relatively uniform. Even if a physical matting agent is used, the coating gloss of the final product is generally above 15%, and it is difficult to stabilize it below 10% or even lower. [0003] Ye Xindong and others published the article "Synthesis and Characterization of 60 / 40 Polyester Resin for Low-Temperature Curing Powder Coatings" in Volume 47 of "Shandong Chemical Industry" in 2018, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C08G63/672C08G63/78C08G18/42C09D167/02C09D175/06C09D163/00C09D5/03
CPCC08G18/425C08G63/672C08G63/6856C08G63/78C08L2205/025C08L2205/035C09D5/03C09D167/02C08L67/02C08L75/06C08L63/00
Inventor 郑荣辉毕海鹏江蓉冯小浩张齐
Owner 黄山市向荣新材料有限公司
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