Waterborne impregnating insulation varnish capable of being quickly cured at low temperature and preparation method thereof

A fast-curing, impregnated insulation technology, applied in coatings, polyester coatings, etc., can solve the problems of increased resin molecular weight, limited amount of phenolic resin, muddy paint, etc., to achieve improved mechanical strength, rapid low-temperature curing, and improved weather resistance Effect

Active Publication Date: 2014-12-10
ELANTAS ZHUHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple to operate, but the amount of phenolic resin used for modification is very limited. If the amount is too large, it will seriously affect the water solubility of the resin, and the conditions of the modification reaction are not easy to control
If the modification temperature is high and the time is long, the molecular weight of the resin will increase greatly, which will affect the water solubility and even the gel
If the modification temperature is low and the time is short, the phenolic resin is not completely connected with the polyester resin, and the free phenolic resin will be precipitated when diluted with water, which will cause the paint to become muddy and have a significant impact on the stability of the paint.
In addition, this method must add a certain amount of organic solvent, otherwise the viscosity will be very high during the modification reaction, resulting in gel

Method used

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  • Waterborne impregnating insulation varnish capable of being quickly cured at low temperature and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A: Preparation of phenolic resin:

[0036] In parts by weight, take 100 parts of phenol, 30 parts of paraformaldehyde, and 1.2 parts of triethylamine into the first reaction kettle, start stirring, and heat up to 130°C for condensation reaction; test the viscosity of the reactant until the viscosity reaches 1200~ 1500cps80℃, cool down, end. Take it out from the first reaction kettle and set it aside.

[0037] B: Synthetic product of the present invention by the phenolic resin that step A makes

[0038] Take 100 parts of the above-mentioned phenolic resin, 58 parts of glycerin, 40 parts of isophthalic acid, and 10 parts of adipic acid and add them to the second reaction kettle, start stirring, raise the temperature to 230 ° C, and test the acid value of the reactant until the acid value is lower than 10mgKOH / g, lower the temperature to 160°C, add 18 parts of trimellitic anhydride, keep the kettle temperature at 160°C, test the acid value of the reactant until the acid ...

Embodiment 2

[0040] A: Preparation of phenolic resin:

[0041] In parts by weight, add 100 parts of xylenol, 20 parts of paraformaldehyde, and 1.5 parts of triethylamine into the first reaction kettle, start stirring, and heat up to 130°C for condensation reaction; test the viscosity of the reactant until the viscosity reaches 1200~1500cps80℃, cool down, end. Take it out from the first reaction kettle and set it aside.

[0042] B: Synthetic product of the present invention by the phenolic resin that step A makes

[0043] Take 100 parts of the above-mentioned phenolic resin, 42 parts of trimethylolpropane, 20 parts of glycerin, 40 parts of isophthalic acid, and 22 parts of adipic acid and add them to the second reaction kettle, start stirring, and raise the temperature to 230 ° C to test the reactants. Acid value, until the acid value is lower than 10mgKOH / g, lower the temperature to 160°C, add 24 parts of trimellitic anhydride, keep the kettle temperature at 160°C, test the acid value of...

Embodiment 3

[0045] A: Preparation of phenolic resin:

[0046] In parts by weight, take 100 parts of phenol, 40 parts of paraformaldehyde, and 3.0 parts of dimethylethanolamine and add them to the first reaction kettle, start stirring, and heat up to 130°C for condensation reaction; test the viscosity of the reactant until the viscosity reaches 1200 ~1500cps80℃, cool down, end. Take it out from the first reaction kettle and set it aside.

[0047] B: Synthetic product of the present invention by the phenolic resin that step A makes

[0048]Take 100 parts of the above-mentioned phenolic resin, 80 parts of trimethylolethane, 50 parts of isophthalic acid, and 20 parts of adipic acid and add them to the second reaction kettle, start stirring, raise the temperature to 230 ° C, and test the acid value of the reactants. Until the acid value is lower than 10mgKOH / g, lower the temperature to 160°C, add 28 parts of trimellitic anhydride, keep the kettle temperature at 160°C, test the acid value of ...

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Abstract

The invention relates to a waterborne impregnating insulation varnish capable of being quickly cured at a low temperature and a preparation method thereof. The preparation method comprises the following steps of preparing phenol and polyformaldehyde in the presence of a basic catalyst to obtain phenolic resin, and then reacting phenolic resin with a trihydric alcohol, dibasic acid and trimellitic anhydride, neutralizing with amine and adding an amino crosslinking agent and water to obtain waterborne alkyd polyester containing high content of phenolic resin. The insulation varnish disclosed by the invention has the performances of both phenolic resin and alkyd polyester, the curing speed of the insulation varnish is greatly improved compared with the conventional alkyd resin and alkyd resin modified by phenolic aldehyde, the curing temperature is reduced to 120 DEG C and the cured varnish film has the advantages of excellent mechanical performance and electrical insulation property.

Description

technical field [0001] The invention relates to an insulating varnish and a preparation method thereof, in particular to a low-temperature fast-curing water-based impregnated insulating varnish and a preparation method thereof. Background technique [0002] With the gradual improvement of society's awareness of environmental protection and production safety, water-based paint is being applied to various fields of society. Substituting water for volatile organic solvents in coatings has absolute advantages in terms of safety, cost, toxicity and environmental pollution. However, the resin of water-based paint must be water-soluble or water-dispersible. This determines that the molecular weight of the resin in water-based paints cannot be made as large as that of solvent paints, and water volatilizes much slower than organic solvents. Therefore, water-based paints often have cured paint films that are not dry, low in strength, and weather-resistant. Sexual disadvantages. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/00C09D5/25C09D7/12C08G63/46C08G8/08
Inventor 姚尚清周美勇徐星
Owner ELANTAS ZHUHAI CO LTD
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