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Method for preparing hyperbranched waterborne polyester resin

A water-based polyester resin and formulation technology, used in polyester coatings, coatings, etc., can solve problems such as water-based polyester limitations, and achieve the effects of strong adhesion, improved brittleness, and high gloss

Active Publication Date: 2016-06-22
SHAOGUAN HEZHONG CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based polyester coating, one of the representative water-based coatings, has the characteristics of high gloss, strong adhesion, high fullness, and excellent impact resistance. It can be formulated with water-soluble amino resin to make water-based baking paint, and can also be used Hydrophilic polyisocyanate is formulated into water-based wood coatings cured at room temperature, so it is widely used in the protection and decoration of metal and wood surfaces; because polyester is easy to hydrolyze, the application of water-based polyester is limited to a certain extent

Method used

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  • Method for preparing hyperbranched waterborne polyester resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] In the reaction kettle, add 3 parts of TMP and 18 parts of DMPA, pass through nitrogen protection, heat up to 130°C, add 0.2 parts of p-toluenesulfonic acid, keep warm for 4 hours, turn off the nitrogen, continue the reaction for 2 hours, then cool to 40°C Add 16 parts of isophthalic acid, 24 parts of maleic anhydride, 6 parts of adipic acid, 3 parts of trimethylolpropane, 20 parts of neopentyl glycol and 0.2 part of p-methoxyphenol, and add 5 parts of reflux di Toluene, and nitrogen protection; heat up to 140°C, wait for most of the solid matter to melt, start stirring, heat up to 160°C and keep the temperature constant for 0.5h, heat up to 180°C, react for 2h until the water output reaches 80% of the theoretical amount; then gradually Raise the temperature to 230-240°C, keep it warm for 2 hours, start sampling to measure the acid value, when the acid value is 40±0.5mgKOH / g, quickly cool down to below 100°C, add 20 parts of ethylene glycol butyl ether, at this time the ...

Embodiment 2

[0013] In the reaction kettle, add 2 parts of TMP and 16 parts of DMPA, pass through nitrogen protection, heat up to 130°C, add 0.2 parts of p-toluenesulfonic acid, keep warm for 4 hours, then turn off the nitrogen, continue the reaction for 2 hours, then cool to 40°C ; Then add 15 parts of isophthalic acid, 25 parts of phthalic anhydride, 7 parts of adipic acid, 5 parts of trimethylolpropane, 20 parts of neopentyl glycol and 0.2 part of p-methoxyphenol, and add 5 parts of reflux xylene at the same time , and nitrogen protection; heat up to 140°C, wait for most of the solid matter to melt, start stirring, heat up to 160°C and keep the temperature for 0.5h, heat up to 180°C, react for 2h until the water output reaches 80% of the theoretical amount; then gradually heat up To 230 ~ 240 ℃, keep warm for 2 hours, start to take samples to measure the acid value, when the acid value is 40±0.5mgKOH / g, quickly cool down to below 100 ℃, add 20 parts of ethylene glycol butyl ether, at thi...

Embodiment 3

[0015] The hyperbranched water-based polyester resin prepared in the embodiment of the present invention is formulated into a water-based polyester-amino drying varnish, and the formula is as follows: 65-80 parts of hyper-branched water-based polyester resin, 12-15 parts of hexamethyl etherified melamine resin , 0.2 parts of substrate wetting agent, 0.3 parts of defoaming agent, 1 part of film-forming aid, 0.2 parts of leveling agent, and deionized water to 100; according to relevant national standards and solvent-based polyester-amino drying varnishes on the market A comparison test of coating film performance was carried out (drying conditions: 160-180°C, 12 minutes), and the test results are shown in Table 1.

[0016] Table 1: Coating film performance test results

[0017]

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Abstract

The invention relates to a method for preparing hyperbranched waterborne polyester resin which is composed of, by weight, 6-10% of TMP, 15-20% of DMPA, 0.1-0.5% of p-toluene sulfonic acid, 15-25% of neopentyl glycol, 12-20% of m-phthalic acid, 20-30% of maleic anhydride or phthalic anhydride, 6-10% of adipic acid, 0.1-0.5% of p-methoxyphenol, 20-30% of ethylene glycol monobutyl ether, 12-20% of dimethylethanolamine, and 70-130% of deionized water. The prepared hyperbranched waterborne polyester resin has the advantages of excellent hydrolysis resistance, water dispersibility and storage stability, has the characteristics of high glossiness, good abrasion resistance, strong adhesion powder, high fullness, excellent impact resistance and the like no matter the resin is made into a waterborne stoving varnish with amino resin or is made into a waterborne woodware paint with hydrophilic polyisocyanate, and is widely used in surface coating and protection of woodware, metals, zinc alloys, aluminum alloys, magnesium alloys, plastics and other products,.

Description

technical field [0001] The invention relates to a preparation method of a polyester resin, in particular to a hyperbranched water-based polyester resin, belonging to the technical field of synthetic resins. Background technique [0002] In recent years, water-based environmentally friendly coatings, including high-solid and solvent-free coatings, water-based coatings, powder coatings and radiation-cured coatings, have achieved rapid development. Water-based polyester coating, one of the representative water-based coatings, has the characteristics of high gloss, strong adhesion, high fullness, and excellent impact resistance. It can be formulated with water-soluble amino resin to make water-based baking paint, and can also be used Hydrophilic polyisocyanate is formulated into water-based wood coatings cured at room temperature, so it is widely used in the protection and decoration of metal and wood surfaces; because polyester is easy to hydrolyze, the application of water-bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/78C09D167/00
Inventor 许钧强康伦国姚东生阳京辉
Owner SHAOGUAN HEZHONG CHEM CO LTD
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