Polyester resin with high hardness and high storage stability for 60/40 mixed powder and preparation method thereof

A polyester resin, high hardness technology, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as inaccessibility, agglomeration, and high activity of carboxyl groups

Active Publication Date: 2020-06-26
黄山市源润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

This polyester resin is used for outdoor powder coatings. The chain segment of the product is relatively soft. Since the terminal carboxyl group is adipic acid and sebacic acid, the carboxyl group has high activity and good short-term stability. changes, but there is still obvious agglomeration after 28 days
Compared with common commercially available products, the products obtained by the above two patent applications have a certain improvement i

Method used

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  • Polyester resin with high hardness and high storage stability for 60/40 mixed powder and preparation method thereof
  • Polyester resin with high hardness and high storage stability for 60/40 mixed powder and preparation method thereof
  • Polyester resin with high hardness and high storage stability for 60/40 mixed powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation method of polyester resin for 60 / 40 mixed powder with high hardness and high storage stability includes the following steps:

[0047] (1) Add neopentyl glycol and 2-methyl-2,4-pentanediol into the reactor, mix well and heat and melt at 140°C;

[0048] (2) Add terephthalic acid and 2,3-dihydroxysuccinic acid to the reactor, and add 0.1% of the total mass of the resin as a catalyst at the same time, and gradually increase the temperature to 190°C under the protection of nitrogen. ℃, the heating rate is controlled at 15℃ / h, and then the temperature is kept for 3 hours. When the effluent is not obvious, add 2,2'-diphthalic acid, and then continue to heat up to 220℃ at 10℃ / h, keep the temperature for 2 hours, wait When there is no obvious distillate, add tris(2-hydroxyethyl) isocyanurate to continue the reaction, slowly increase the temperature to 240°C at 8°C / h, and continue the reaction until the acid value of the polyester resin is less than 35mgKOH / g ;

[0049...

Embodiment 2

[0053] In (2), the reaction conditions are as follows:

[0054] Add terephthalic acid and 2,3-dihydroxysuccinic acid to the reaction kettle, and at the same time add 0.1% of the total mass of the resin monobutyl tin oxide as a catalyst, and gradually increase the reaction temperature to 185°C under the protection of nitrogen. The speed is controlled at 15℃ / h, and then the temperature is kept for 2.5 hours. When the effluent is not obvious, add 2,2'-diphthalic acid, and then continue to heat up to 215℃ at 10℃ / h, and keep for 1.5 hours. When the distillate is obvious, add the formula amount of tris(2-hydroxyethyl) isocyanurate to continue the reaction, slowly increase the temperature to 235°C at 9°C / h, and continue the reaction until the acid value of the polyester resin is less than 35mgKOH / g up to.

Embodiment 3

[0055] The reaction conditions of Example 3 and Example 4 are the same as those of Example 1.

[0056] Table 1 The mole fraction of each raw material in Examples 1 to 4

[0057]

[0058]

[0059] Regarding the present invention, in the process of obtaining the best solution, the inventor also conducted the following experiments, specifically:

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Abstract

The invention, which belongs to the technical field of preparation of polyester resin, particularly relates to polyester resin with high hardness and high storage stability for 60/40 mixed powder anda preparation method thereof. According to the polyester resin for 60/40 mixed powder, the polyester resin is characterized by being prepared from the following main raw materials: terephthalic acid,2, 2 '-biphenyldicarboxylic acid, 2, 3-dihydroxy succinic acid, neopentyl glycol, 2-methyl-2, 4-pentanediol, tris (2-hydroxyethyl) isocyanurate and 3-methyl phthalic anhydride. According to the invention, the performances such as impact resistance, coating film appearance, caking resistance, hardness, gloss and the like of polyester resin products are guaranteed, the influence on subsequent spraying use and coating film quality due to crosslinking of the powder coating in the storage period is eliminated, the polyester resin can be stored in an environment of 45 DEG C for a long time without influencing subsequent use, and the polyester resin has excellent high storage stability.

Description

Technical field [0001] The invention belongs to the technical field of the preparation of polyester resins, and specifically relates to a polyester resin for 60 / 40 mixed powder with high hardness and high storage stability, and also relates to a preparation method of the above-mentioned polyester resin. Background technique [0002] Ordinary 60 / 40 polyester resins are usually obtained by polymerizing flexible monomers such as diethylene glycol, adipic acid, etc. with neopentyl glycol and terephthalic acid. The functionality of the chain segment is low, and the polymer The ester segment is relatively soft, and the glass transition temperature and softening point of the product are low. The glass transition temperature is generally 42-53°C, and the softening point is generally 95-110°C. In order to achieve full curing with E-12 epoxy resin, generally Use highly active trimellitic anhydride to block the polyester segments to obtain a polyester resin with a polyester end group of mor...

Claims

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Application Information

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IPC IPC(8): C08G63/685C08G63/78C08G63/91C09D167/00C09D5/03
CPCC08G63/6856C08G63/916C08G63/78C09D167/00C09D5/03
Inventor 胡军方志和胡红飞
Owner 黄山市源润新材料科技有限公司
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