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Gel point control method in synthesis technology of polyester for powder coatings

A technology of synthesis process and control method, applied in the direction of powder coating, polyester coating, coating, etc., can solve the problems of loss, increase of production cost, damage of production equipment, etc.

Inactive Publication Date: 2015-11-25
LUOYANG ZHONGPING IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when preparing polymers with branched structures, if A 2 +B 3 When the monomer is polymerized, gelation is very easy to occur. The gel is a chemical gel, which cannot be dissolved by heating or adding a solvent, which will damage the production equipment, cause losses, and increase the production cost.

Method used

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  • Gel point control method in synthesis technology of polyester for powder coatings
  • Gel point control method in synthesis technology of polyester for powder coatings
  • Gel point control method in synthesis technology of polyester for powder coatings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In the reaction vessel, add 1 mol of terephthalic acid (mole, amount of substance), 1 mol of trimellitic anhydride, 2.6 mol of ethylene glycol, a small amount of catalyst, mix well, take a sample of 0.7 g, and carry out the reaction with 0.1 mol / L potassium hydroxide ethanol solution Titration, test acid value according to national standard GB / T6743-2008, calculate PAV 0 It is 540±5mg / g, then heated to 130°C for esterification, then heated to 210°C, and polycondensed at a vacuum of 10kPa. After 3 hours, take a sample to measure the acid value, and calculate the PAV 1 It is 200±5mg / g. calculate:

[0019] 1 - PAV 1 PAV 0 = 1 - 200 540 = 1 - 0.370 = 0.630

[0020] 2 K ...

Embodiment 2

[0023] In the reaction vessel, add 1 mol of terephthalic acid (mole, amount of substance), 1 mol of trimellitic anhydride, 2.6 mol of ethylene glycol, a small amount of catalyst, mix well, take a sample of 0.7 g, and carry out the reaction with 0.1 mol / L potassium hydroxide ethanol solution Titration, test acid value according to national standard GB / T6743-2008, calculate PAV 0 It is 540±5mg / g, then heated to 140°C for esterification, then heated to 210°C, and polycondensed at a vacuum of 75kPa. After 3 hours, take a sample to measure the acid value, and calculate the PAV 1 It is 108±5mg / g. calculate:

[0024] 1 - PAV 1 PAV 0 = 1 - 108 540 = 1 - 0.2 = 0.8

[0025] 2 K ...

Embodiment 3

[0028] In the reaction vessel, add 1 mol of terephthalic acid (mole, amount of substance), 1 mol of trimellitic anhydride, 2.6 mol of ethylene glycol, a small amount of catalyst, mix well, take a sample of 0.7 g, and carry out the reaction with 0.1 mol / L potassium hydroxide ethanol solution Titration, test acid value according to national standard GB / T6743-2008, calculate PAV 0 It is 540±5mg / g, then heated to 140°C for esterification, then heated to 210°C, and polycondensed at a vacuum of 90kPa. After 2 hours, take a sample to measure the acid value, and calculate the PAV 1 It is 80±2mg / g. calculate:

[0029] 1 - PAV 1 PAV 0 = 1 - 80 540 = 1 - 0.148 = 0.852

[0030] 2 K ...

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Abstract

The invention discloses a gel point control method in a synthesis technology of polyester for powder coatings. In the process of preparing the polyester through reaction of polybasic acid and polyhydric alcohol, the reaction degree is controlled by determining the hydroxyl value or acid value in real time at the condensation polymerization stage, so that the system is controlled to end the reaction before the gel point, and gel generation is avoided. The gel point control method in the synthesis technology of the polyester for the powder coatings has the advantages that the technology is simple, curing efficiency is high, crosslinking point density is large, and the reaction system can be effectively controlled in real time.

Description

technical field [0001] The invention relates to the field of polyester synthesis for powder coatings, in particular to a gel point control method in the polycondensation stage in the synthesis process of polyesters with a multi-branched structure for powder coatings. Background technique [0002] Powder coating is a solvent-free, 100% solid powder coating, which has the characteristics of no solvent, no pollution, recyclable, energy and resource saving, reduced labor intensity and high mechanical strength of the coating film. It is a new and environmentally friendly new Material. In recent years, with the widespread use of powder coatings, various functional powder coating products have been developed one after another and have grown rapidly. However, the main raw material of powder coatings is polyester. Polyester with multi-branched structure exhibits high solubility, low viscosity, High fluidity, high chemical reactivity and other excellent properties that many linear p...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/78C09D167/00C09D5/03
Inventor 许庆利朱新军郭福全马建坡李日升师志伟
Owner LUOYANG ZHONGPING IND CO LTD
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