Strong bending polyester resin for mixed powder coating and preparation method thereof

A powder coating and polyester resin technology, applied in the field of polyester resin and strong bending polyester resin, can solve the problems of many customer complaints, improve flexibility, improve conversion rate, promote linearization and branching effect of reaction

Inactive Publication Date: 2018-07-06
ZHEJIANG GUANGHUA NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the 50:50 mixed powder coating on the market is difficult to meet this n

Method used

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  • Strong bending polyester resin for mixed powder coating and preparation method thereof
  • Strong bending polyester resin for mixed powder coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A preparation method of strong bending polyester resin for hybrid powder coating, the specific steps are as follows:

[0035] (1) Add 2-ethyl-2-methyl-1,3-propanediol, 1,4-cyclohexanedimethanol, triethylene glycol, the first part Azelaic acid, branching agent and esterification catalyst, continue to pass nitrogen, heat up to 140°C, stir for 30 minutes, then raise the temperature to 230°C at a heating rate of 8°C / hour, and then raise the temperature at a heating rate of 2°C / hour to 250°C, stirring and reacting for 2 hours;

[0036] (2) Cool down to 200°C, add trimellitic anhydride and the second part of azelaic acid, then heat up to 260°C, and stir for 30 minutes;

[0037] (3) Cool down to 180°C, add curing accelerator, continue to stir for 1 hour, remove most of the water-carrying agent under reduced pressure for the first time, then add water, remove all solvents under reduced pressure for the second time, and solidify after natural cooling, Instantly.

[0038] Amon...

Embodiment 2

[0048] A preparation method of strong bending polyester resin for hybrid powder coating, the specific steps are as follows:

[0049] (1) Add 2-ethyl-2-methyl-1,3-propanediol, 1,4-cyclohexanedimethanol, triethylene glycol, the first part Azelaic acid, branching agent and esterification catalyst, continue to pass nitrogen, heat up to 150°C, stir for 40 minutes, then raise the temperature to 235°C at a heating rate of 10°C / hour, and then raise the temperature at a heating rate of 3°C / hour to 255°C, stirring and reacting for 3 hours;

[0050] (2) Cool down to 210°C, add trimellitic anhydride and the second part of azelaic acid, then heat up to 265°C, and stir for 40 minutes;

[0051] (3) Cool down to 190°C, add a curing accelerator, continue to stir for 2 hours, remove most of the water-carrying agent under reduced pressure for the first time, then add water, remove all solvents under reduced pressure for the second time, and solidify after natural cooling. Instantly.

[0052] ...

Embodiment 3

[0062] A preparation method of strong bending polyester resin for hybrid powder coating, the specific steps are as follows:

[0063] (1) Add 2-ethyl-2-methyl-1,3-propanediol, 1,4-cyclohexanedimethanol, triethylene glycol, the first part Azelaic acid, branching agent and esterification catalyst, continue to pass nitrogen, heat up to 140°C, stir for 40 minutes, then raise the temperature to 235°C at a heating rate of 8°C / hour, and then raise the temperature at a heating rate of 2°C / hour to 255°C, stirring and reacting for 2 hours;

[0064] (2) Cool down to 210°C, add trimellitic anhydride and the second part of azelaic acid, then heat up to 260°C, and stir for 40 minutes;

[0065] (3) Cool down to 180°C, add curing accelerator, continue to stir for 2 hours, remove most of the water-carrying agent under reduced pressure for the first time, then add water, remove all solvents under reduced pressure for the second time, and solidify after natural cooling, Instantly.

[0066] Amo...

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Abstract

The invention discloses a strong bending polyester resin for a mixed powder coating and a preparation method thereof. The preparation method is characterized in that 2-ethyl-2-methyl-1, 3-propylene glycol, 1, 4-cyclohexanedimethanol, tri ethylene glycol, azelaic acid and trimellitic anhydride are used as the raw materials and esterified to obtain the polyester resin; a water-carrying agent is added to the reaction system and can generate a azeotrope with the generated water, so that water can be carried away from the reaction system, and as a result, the esterifying reaction transformation rate is increased; and meanwhile, nitrogen is charged in the reaction, so that the oxidization side reaction can be prevented, and moreover, the produced can be carried away in the nitrogen flowing process, and as a result, the esterifying reaction can be further promoted. The mixed powder coating prepared through the polyester resin is outstanding in bending resistance and impact resistance.

Description

technical field [0001] The invention relates to a polyester resin, in particular to a strong bending polyester resin. The invention belongs to the technical field of powder coating. Background technique [0002] Energy saving and environmental protection are the main theme in today's world, and the development trend of the coatings industry is also the pursuit of energy saving and environmental protection. Powder coating has a completely different form from general coatings. It exists in the state of fine powder. It is a green coating produced without volatile organic solvents. It is resource-saving, solvent-free, low pollution, high efficiency, and one-time coating. It has the characteristics of packaging and wide application fields, so it has developed rapidly in all countries in the world. Especially since entering the 21st century, environmental protection requirements have driven its rapid development even more. Energy-saving, low-pollution environmentally friendly p...

Claims

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Application Information

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IPC IPC(8): C08G63/668C08G63/85C09D167/00C09D163/00C09D5/03C09D7/61C09D7/47
Inventor 祝一平
Owner ZHEJIANG GUANGHUA NEW MATERIALS
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