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Epoxy modified polyester emulsion as well as preparation method and application thereof

A technology of epoxy-modified polyester and emulsion, which is applied in the field of coatings and can solve the problems of slow water volatilization and poor water resistance

Active Publication Date: 2021-05-14
ETERNAL CHEM (TIANJIN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the unreacted carboxyl and hydroxyl groups on the molecular chain of the water-based polyester resin, these hydrophilic groups make the resin volatilize slowly during use, form a polymer network structure, and have disadvantages such as poor water resistance. its practical application

Method used

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  • Epoxy modified polyester emulsion as well as preparation method and application thereof
  • Epoxy modified polyester emulsion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] An epoxy-modified polyester emulsion with an acid value of 20mgKOH / g and a solid content of 31%;

[0067] Its preparation method comprises the following steps:

[0068] (1) 100g of neopentyl glycol, diethylene glycol, glycerin and trihydroxymethylethane in a mass ratio of 20:30:40:10 and 150g of phthalate in a mass ratio of 20:20:20:30:10 Formic acid, isophthalic acid, terephthalic acid, trimesic acid and dihydroxymethylpropionic acid were heated under the protection of nitrogen gas and 80 mL of toluene was added, and the system was heated by changing the temperature from normal temperature to 10 °C / h. Raise the temperature to 70°C at a heating rate of 10 minutes, then raise the temperature to 120°C at a heating rate of 10°C / h, hold at a temperature of 30 minutes, and finally raise the temperature to 220°C at a heating rate of 10°C / h, and hold at a temperature of 3 hours. Water and toluene are removed in a vacuum to obtain a polyester prepolymer with an acid value of 5...

Embodiment 2

[0073] A kind of epoxy modified polyester emulsion, its difference with embodiment 1 is only, the E-20 epoxy resin in the step (2) adopts E-12 epoxy resin to replace, and other components, consumption and steps are all the same as Example 1 is the same.

Embodiment 3

[0075]A kind of epoxy-modified polyester emulsion, its difference with embodiment 1 is only, the consumption of the glutaraldehyde of step (3) is 2.5g, the consumption of sulfonated polysulfone is 0.5g; Adopt E-12 epoxy The E-20 epoxy resin in resin replacement step (2), other components, consumption and steps are all identical with embodiment 1.

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Abstract

The invention provides an epoxy modified polyester emulsion as well as a preparation method and application thereof. The epoxy modified polyester emulsion is prepared from the following raw materials in parts by weight: polyhydric alcohol, polybasic acid, epoxy resin, a cross-linking agent, a catalyst and a neutralizer. The cross-linking agent can react with the epoxy modified polyester prepolymer in the presence of the catalyst to obtain the epoxy modified polyester emulsion; and the obtained epoxy modified polyester emulsion has the toughness of the polyester and the cohesiveness of the epoxy resin, has excellent adhesive force, physical and mechanical properties and chemical stability, is non-toxic and harmless, and meets the green and environment-friendly requirements.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to an epoxy-modified polyester emulsion and a preparation method and application thereof. Background technique [0002] Polyester polymers are polycondensed from polyols and polyacids through esterification. Polyester resin has the advantages of good gloss, high hardness, strong impact resistance, and excellent electrical insulation. It is a class of engineering plastics with excellent performance and a wide range of uses. [0003] In recent years, with the continuous enhancement of people's awareness of environmental protection, the dispersion system without volatile organic compounds has become the development direction of new polyester polymer materials. Among them, water-based polyester has the advantages of high mechanical properties and environmental protection, so the research and development of water-based polyester has been paid more and more attention by rese...

Claims

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Application Information

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IPC IPC(8): C08G63/91C09D167/02
CPCC08G63/914C08G63/916C09D167/02
Inventor 孟祥伟张志华张鹤
Owner ETERNAL CHEM (TIANJIN) CO LTD