50:50 polyester resin for indoor high-hardness and high-gloss powders, and preparation method thereof

A polyester resin, high hardness technology, used in powder coatings, polyester coatings, epoxy resin coatings, etc., can solve the problems of low coating film hardness, pencil hardness can only reach 2B, and the hardness requirements cannot be achieved.

Active Publication Date: 2019-06-14
安徽永利新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the above-mentioned patent can obtain a coating film with higher gloss, due to the large amount of long-chain dibasic acid such as octadecanedioic acid, monobasic acid such as 4-trifluoromethyl salicylic acid and 1 , 6-Hexanediol dimethacrylate raw material, resulting in too soft chain segments, low hardness of the cured coating film, pencil hardness can only reach 2B, for applications that require high gloss and high hardness (≥2H) say, cannot fulfill its requirements regarding hardness

Method used

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  • 50:50 polyester resin for indoor high-hardness and high-gloss powders, and preparation method thereof
  • 50:50 polyester resin for indoor high-hardness and high-gloss powders, and preparation method thereof
  • 50:50 polyester resin for indoor high-hardness and high-gloss powders, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The main raw materials used are as follows:

[0043] Dimethyl 1,2-cyclohexyldicarboxylate, terephthalic acid, dipentaerythritol, neopentyl glycol, 5-hydroxylauric acid glyceride, tris(trimethylsilyl) phosphate, ethylene glycol diglycidyl ether , (2,7-octanediol-1-yl) succinic anhydride;

[0044] Can be used for the preparation method of 50:50 polyester resin for indoor high hardness, high gloss powder coating, comprises the following steps:

[0045] (1) Add 10mol% dipentaerythritol and 20mol% neopentyl glycol into the reaction kettle, and heat and melt at 130°C to obtain a mixed material;

[0046] (2) Add 16 mol% dimethyl 1,2-cyclohexyldicarboxylate to the mixed material of (1), and add a catalyst at the same time, slowly raise the temperature to 185°C at a heating rate of 5°C / h and keep it warm for the initial esterification reaction. After 3 hours of heat preservation reaction at 190°C, add 12mol% 5-hydroxyl dodecanoin, 8mol% ethylene glycol diglycidyl ether and 15m...

Embodiment 2

[0052] Can be used for the preparation method of 50:50 polyester resin for indoor high hardness, high gloss powder coating, comprises the following steps:

[0053] (1) Add 6mol% dipentaerythritol and 24mol% neopentyl glycol into the reaction kettle, and heat and melt at 130°C to obtain a mixed material;

[0054] (2) Add 15 mol% dimethyl 1,2-cyclohexyldicarboxylate to the mixed material of (1), and add a catalyst at the same time, slowly raise the temperature to 185°C at a heating rate of 5°C / h and keep it warm for the initial esterification reaction. After 190°C heat preservation reaction for 3 hours, add 15mol% 5-hydroxydodecanoin, 10mol% ethylene glycol diglycidyl ether and 10mol% terephthalic acid at this time, pass through nitrogen protection, and then use 10°C / h The heating rate is to gradually raise the temperature to 235°C, and then keep the temperature until no obvious distillate is distilled out, and the acid value of the reactant is 24mgKOH / g;

[0055] (3) Add an an...

Embodiment 3

[0060] Can be used for the preparation method of 50:50 polyester resin for indoor high hardness, high gloss powder coating, comprises the following steps:

[0061] (1) Add 8mol% dipentaerythritol and 20mol% neopentyl glycol into the reaction kettle, and heat and melt at 130°C to obtain a mixed material;

[0062] (2) Add 12 mol% dimethyl 1,2-cyclohexyldicarboxylate to the mixed material of (1), and add a catalyst at the same time, slowly raise the temperature to 185°C at a heating rate of 5°C / h and keep it warm for the initial esterification reaction. After 3 hours of heat preservation reaction at 190°C, add 16mol% 5-hydroxydodecanoin, 8mol% ethylene glycol diglycidyl ether and 15mol% terephthalic acid at this time, pass through nitrogen protection, and then use 10°C / h The heating rate is to gradually raise the temperature to 235°C, and then keep the temperature until no obvious distillate is distilled out, and the acid value of the reactant is 24mgKOH / g;

[0063] (3) Add an a...

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Abstract

The invention belongs to the field of coatings, concretely relates to a 50:50 polyester resin for indoor powdery coatings with high requirements for the gloss and hardness, and also relates to a preparation method of the polyester resin. The 50:50 polyester resin for indoor powdery coatings is characterized in that the acid value of the polyester resin is 67-75 mgKOH/g, and the softening point is100-115 DEG C. The polyester resin is formed by copolymerizing the following main raw materials: dimethyl cyclohexane-1,2-dicarboxylate, terephthalic acid, neopentyl glycol, glycerol 5-hydroxydodecanoate, dipentaerythritol, tris(trimethylsilyl) phosphate, ethylene glycol diglycidyl ether and (2,7-octadien-1-yl)succinic anhydride. The polyester resin of the invention is used in indoor 50:50 mixed powder coatings, has a good apparent levelability, allows films formed after curing film formation of the coatings to have a high hardness, and can be used to obtain coated plate surfaces with high hardness and high gloss.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a 50:50 polyester resin which can be used for indoor high-hardness and high-gloss powder coatings, and also relates to a preparation method of the above-mentioned polyester resin. Background technique [0002] CN109207030A discloses a kind of preparation method of polyester resin for high-gloss powder coating, it is characterized in that, comprises the steps: [0003] (1) Take the selected amount of neopentyl glycol, 2-hydroxy-5-methyl m-xylylene dimethanol, 1,6-hexanediol dimethacrylate, etc. and mix them, and control the temperature below 125°C to carry out heating and melting; [0004] (2) Add the described octadecanedioic acid, isophthalic acid and 4-trifluoromethyl salicylic acid of selected amount in above-mentioned mixture material, and add the described catalyst of selected amount, gradually heat up under nitrogen protection React until no obvious distillate is disti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D163/00C09D5/03C09D7/61C09D7/63C08G63/695C08G63/85C08G63/91
Inventor 余利军余洪涛朱学刚
Owner 安徽永利新材料科技有限公司
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