A kind of water-based insulating paint and preparation method thereof

An insulating paint, water-based technology, applied in coatings, epoxy resin coatings, etc., can solve problems such as unenvironmental protection and poor insulation performance, and achieve the effect of simple use process, high heat resistance, and improved insulation performance.

Active Publication Date: 2017-07-07
ZHUZHOU TIMES ELECTRIC INSULATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing water-based insulating varnish is generally added with a co-solvent, which is water-based by adding an emulsifier, or prepared into a water-based system by introducing acrylic acid or acrylate monomers, and the insulation performance is not good.
And it has high volatile organic compounds (VOC), which has great potential safety hazards and is not environmentally friendly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The preparation method of described water-based insulating varnish comprises the following steps:

[0029] (1) Under the condition of nitrogen blanketing, the epoxy resin and the polyol are reacted at 90-110° C. for 3-5 hours to obtain a prepolymer having an epoxy-terminated functional group. Wherein, the mass usage ratio of the epoxy resin and the polyol is 1:5-8.

[0030] (2) Under the condition of nitrogen blanketing, mix the polyamine and the product prepolymer in step (1), dropwise add epoxy resin, react completely at 60-80°C, add dropwise phenyl glycidyl ether, and react to the end . Wherein, the mass usage ratio of polyamine, product prepolymer in step (1), epoxy resin and phenyl glycidyl ether is 10-15:5-8:1-2:1. The epoxy resin is one of EPON828, EPON834, EPON1001, E-51 or E-41, and the polyamine is selected from diaminodiphenylsulfone, 2,4-diaminodiphenylmethane, polyetheramine , one of isophorone diamine and 1,2-cyclohexanediamine.

[0031] (3) Cool down ...

Embodiment 1

[0034] Weigh 29.56g of E-51 epoxy resin, 120.2g of polyethylene glycol 6000, 8.5g of Saike, and 19.1g of neopentyl glycol and mix them in a flask, stir and heat up to 100°C under nitrogen blanketing, and react for 4 hours to obtain a pre- Polymer A. Weigh 39.6g of 2,4-diaminodiphenylmethane and 19.3g of prepolymer A and mix them in a flask, raise the temperature to 70°C under nitrogen blanketing, add 3.8g of E-51 epoxy resin dropwise, after the reaction is complete, add dropwise 3 g phenyl glycidyl ether. After the reaction is complete, the temperature of the system is lowered to 50°C, 35.38 g of deionized water is added dropwise, and the water-based epoxy curing agent is obtained through phase inversion emulsification.

[0035] Weigh 15g of water-based epoxy curing agent, 45g of water-based epoxy resin, 0.3g of Yingzhi Chemical 0633 defoamer, 0.5g of Goss GSK-550 leveling agent, 1g of Deqian FN265 wetting and dispersing agent and mix evenly. A 10×10cm copper sheet is immers...

Embodiment 2

[0037] Weigh 18.5g of E-51 epoxy resin, 120.2g of polyethylene glycol 6000, 19.3g of Saike, and 8.5g of neopentyl glycol and mix them in a flask, stir and heat up to 100°C under nitrogen blanketing, and react for 4 hours to obtain a pre- Polymer A. Weigh 45g of 2,4-diaminodiphenylmethane and 24g of prepolymer A and mix them in a flask, raise the temperature to 70°C under nitrogen blanketing, add 6g of E-51 epoxy resin dropwise and after the reaction is complete, add 3g of phenyl shrink glyceryl ether. After the reaction is complete, the temperature of the system is lowered to 50°C, 42 g of deionized water is added dropwise, and the water-based epoxy curing agent is obtained through phase inversion emulsification.

[0038] Weigh 15g of water-based epoxy curing agent, 37.5g of water-based epoxy resin, 0.5g of Yingzhi Chemical 0633 defoamer, 0.5g of Goss GSK-550 leveling agent, 1g of Deqian FN265 wetting and dispersing agent and mix evenly. Immerse a 10×10cm copper sheet in the...

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Abstract

The invention discloses a water-based insulating varnish comprising water-based epoxy resin, a water-based epoxy curing agent modified by a polyol, and an auxiliary agent. The weight ratio of polyol modified waterborne epoxy curing agent is 2.5‑3:1. The invention also discloses that the preparation method of the water-based insulating varnish comprises: reacting epoxy resin and polyol to obtain a prepolymer with terminal epoxy functional group; Add phenyl glycidyl ether, react to the end; cool down, add water to emulsify to obtain water-based epoxy curing agent; weigh water-based epoxy curing agent, water-based epoxy resin, defoamer, leveling agent, dispersant and mix well, Baking, cooling steps. The water-based insulating varnish has no co-solvent, zero VOC, no safety hazard, meets the requirements of green environmental protection, has high electrical strength and high heat resistance.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a water-based insulating varnish and a preparation method thereof. Background technique [0002] Insulating varnish is mainly used for coils and other insulating parts of electrical appliances to fill the gaps, and after curing, the impregnated object becomes a dense whole, thereby improving its insulation performance, mechanical performance and weather resistance. Insulating varnishes are generally divided into two types: solvent-based varnishes and solvent-free varnishes. Solvent-based paints use organic compounds as solvents; solvent-free paints use active diluents, which participate in film formation. Although solvent-free paint can reduce the pollution of the environment caused by the volatilization of organic solvents, the active diluent in solvent-free paint is also volatile to a certain extent, which is also harmful to people and the environment, and is flammable and exp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/40C08G59/50C08G59/20C09D163/00
Inventor 丁嘉欣邢国华裴海帆李颜王浩新曾智
Owner ZHUZHOU TIMES ELECTRIC INSULATION
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