High-temperature-resistant polyester for powder coating and preparation method of high-temperature-resistant polyester

A powder coating, high temperature resistant technology, applied in powder coatings, fire retardant coatings, coatings, etc., can solve problems such as unsatisfactory adhesion and gloss, and achieve equipment cost-free, easy to operate, and simple to prepare. Effect

Active Publication Date: 2016-12-21
HUANGSHAN ZHENGJIE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still various shortcomings in the preparation and application of existing silicon-modified polyester resins, which cannot meet the above practical application requirements; at the same time, its adhesion and gloss are unsatisfactory

Method used

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  • High-temperature-resistant polyester for powder coating and preparation method of high-temperature-resistant polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare the high temperature resistant powder coating polyester of the present invention according to the following method, the method comprises the following steps: 1) add terephthalic acid, isophthalic acid, trimellitic anhydride, neopentyl glycol and tetraisopropyl titanate in a reaction vessel , and its parts by weight are respectively 15 parts, 7 parts, 3 parts, 11 parts and 0.1 part, while adding xylene as a solvent;

[0033] 2) Heat to 170°C to melt all the materials, then add 0.3 parts of triphenyl phosphite, slowly raise the temperature to 220°C, and the heating rate is 10-20°C / h;

[0034] 3) When the temperature is higher than 220°C, control the temperature of the reaction mixture between 220-240°C, and the reaction time is 3-12h;

[0035] 4) Cool down to 180°C, add 1 part of trimethylolpropane, slowly heat up to 220°C to continue the reaction, so that the acid value is less than 10mgKOH / g; then add xylene to form a polyester intermediate solution with a solid...

Embodiment 2

[0041] Prepare the high temperature resistant powder coating polyester of the present invention according to the following method, the method comprises the following steps: 1) add terephthalic acid, isophthalic acid, trimellitic anhydride, neopentyl glycol and tetraisopropyl titanate in a reaction vessel , and its parts by weight are respectively 16 parts, 7.5 parts, 3.5 parts, 12 parts and 0.1 parts, while adding xylene as a solvent;

[0042] 2) Heat to 170°C to melt all the materials, then add 0.3 parts of triphenyl phosphite, slowly raise the temperature to 220°C, and the heating rate is 10-20°C / h;

[0043] 3) When the temperature is higher than 220°C, control the temperature of the reaction mixture between 220-240°C, and the reaction time is 3-12h;

[0044] 4) Cool down to 180°C, add 1.5 parts of trimethylolpropane, slowly raise the temperature to 220°C to continue the reaction, so that the acid value is less than 10mgKOH / g; then add xylene to form a polyester intermediate s...

Embodiment 3

[0050] Prepare the high temperature resistant powder coating polyester of the present invention according to the following method, the method comprises the following steps: 1) add terephthalic acid, isophthalic acid, trimellitic anhydride, neopentyl glycol and tetraisopropyl titanate in a reaction vessel , its parts by weight are respectively 17 parts, 8 parts, 4 parts, 14 parts and 0.1 part, adding xylene simultaneously as solvent;

[0051] 2) Heat to 170°C to melt all the materials, then add 0.3 parts of triphenyl phosphite, slowly raise the temperature to 220°C, and the heating rate is 10-20°C / h;

[0052] 3) When the temperature is higher than 220°C, control the temperature of the reaction mixture between 220-240°C, and the reaction time is 3-12h;

[0053] 4) Cool down to 180°C, add 2 parts of trimethylolpropane, slowly raise the temperature to 220°C to continue the reaction, so that the acid value is less than 10mgKOH / g; then add xylene to form a polyester intermediate sol...

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Abstract

The invention discloses high-temperature-resistant polyester for a powder coating and a preparation method of the high-temperature-resistant polyester. The preparation method comprises the following steps that 1, a polyester intermediate solution is prepared; 2, a silicon intermediate solution is prepared; 3, the polyester intermediate solution and the silicon intermediate solution react to obtain high-temperature-resistant polyester for the powder coating. High-temperature-resistant polyester for the powder coating can meet the high-temperature-resistant requirement of 300 DEG C or above, and the adhesive force and glossiness obtained after 1 h and 3 h of baking at the temperature are not obviously changed, and are superior to those in the prior art under the same condition.

Description

technical field [0001] The invention belongs to the field of high molecular polymers and relates to a polyester resin and a preparation method thereof, in particular to a polyester for high-temperature-resistant powder coating and a preparation method thereof. Background technique [0002] Powder coating is one of the most promising coating varieties in the world today, and belongs to a rapidly developing coating branch. Compared with traditional solvent-based coatings, it has the characteristics of saving energy and resources, reducing environmental pollution, simple process, durable coating, recyclable powder, and wide application fields. Conventional powder coatings mainly include film-forming substances, curing agents, leveling agents and pigments. Among them, the most common film-forming substance is polyester resin. [0003] The temperature resistance of existing powder coatings is usually only 200°C, and it is difficult to meet the temperature resistance requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/10C09D5/03C08G77/445C08G63/20C08G77/20
CPCC08G63/20C08G77/20C08G77/445C09D5/03C09D5/18C09D183/10
Inventor 江建明许国徽方敏辉王永垒
Owner HUANGSHAN ZHENGJIE NEW MATERIALS
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