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Water-soluble insulating varnish and preparation method thereof

A water-soluble, insulating paint technology, applied in the direction of latex paint, coating, epoxy resin coating, etc., can solve the problems of paint film color appearance and insulation performance adverse effects, irregular shape particle size distribution, easy skinning and other problems, Achieve the effects of stable transparency, long pot life and strong toughness

Inactive Publication Date: 2008-09-24
SHANGHAI BAOQING TONGYONG ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the water-based resin mainly adopts the emulsification method. In the prepared resin emulsion, the size of the resin dispersed phase particles in the emulsion is relatively large, all of which are micron-sized, and the shape of the particles is irregular and the particle size distribution is wide, resulting in milky white and opaque emulsion. And it is easy to be affected by external conditions such as temperature, acid and alkali, light, collision, etc., and it is prone to skin formation and demulsification; in addition, because the paint liquid contains a large amount of emulsifier, the color appearance and insulation performance of the paint film will be affected after curing. come adverse effects, therefore, greatly limit its application in the field of electrical insulation treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] At room temperature, add 30g of water-soluble alkyd resin and 20g of water-based curing agent Cymel 350 into the container, and turn on the stirring device to mix the two resins evenly; add 0.1g of defoamer and 0.35g of leveling agent while stirring, Continue to stir for 5-10 minutes after the addition; then add 0.2 g of catalyst and 58.5 g of water, and stir for 40-60 minutes to obtain the product. The paint liquid is a translucent liquid without mechanical impurities. After curing at 130℃×2h, the pencil hardness of the paint film reaches 2H and has a certain degree of flexibility. The normal electric strength reaches 125MV / m, and after immersion in water for 24h, it is 101MV / m. The normal volume resistivity is 2.1×10 12 Ω·m, 9.2×10 after soaking in water for 24 hours 10 Ω·m.

Embodiment 2

[0037] At room temperature, add 40g of water-soluble epoxy resin and 10g of water-based curing agent Cymel 325 into the container, and turn on the stirring device to mix the two resins evenly; add 0.1g of defoamer and 0.35g of leveling agent while stirring, Continue to stir for 5-10 minutes after the addition; then add 0.2 g of catalyst and 58.5 g of water, and stir for 30-50 minutes to obtain the product. The paint liquid is a light yellow transparent liquid without mechanical impurities. After curing at 130℃×2h, the pencil hardness of the paint film reaches 2H and has a certain degree of flexibility. The normal electric strength reaches 119MV / m, and after immersion in water for 24h, it is 96MV / m. The normal volume resistivity is 2.0×10 12 Ω·m, 8.4×10 after soaking in water for 24 hours 10 Ω·m.

Embodiment 3

[0039] At room temperature, add 40g of water-soluble polyester resin and 13g of water-based curing agent cymel 303 into the container, and turn on the stirring device to mix the two resins evenly; add 0.1g of defoamer and 0.35g of leveling agent while stirring, Continue stirring for 5-10 minutes after the addition; then add 0.2 g of initiator and 45.75 g of water, and stir for 30-50 minutes to obtain the product. It is a transparent bluish translucent liquid without mechanical impurities. After curing at 130℃×2h, the pencil hardness of the paint film reaches 3H and has a certain degree of flexibility. The normal electric strength reaches 137MV / m, and after immersion in water for 24h, it is 116MV / m. The normal volume resistivity is 2.9×10 12 Ω·m, 10.7×10 after soaking in water for 24 hours 11 Ω·m.

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Abstract

The invention relates to water-soluble insulating varnish and a preparation method thereof. The water-soluble insulating varnish of the invention consists of water-soluble resin, water-borne curing agent, water-base defoamer, water-base flow agent, water-base catalyst and water; the proportion of the components is as below: 30 percent to 50 percent of water-soluble resin; 10 percent to 30 percent of water-base curing agent, 1 percent to 1.0 percent of water-base catalyst, 0 percent to 0.5 percent of water-base defoamer, 0 percent to 0.5 percent of water-base flow agent and 20 percent to 60 percent of water; the water-soluble insulating varnish has the advantages of environmental protection and safety; no harmful solvent released to the atmosphere; no inflammability and explosion, no corrosion; no transparent or translucent paint liquid, good stability, long application service life under normal temperature; simple solidifying process, good insulating performance of the paint film after solidification, high strength and strong toughness; technical indexes meeting or exceeding the technical indexes of the prior solvent-type insulating varnish; the most important is that the insulating varnish takes water as solvent or diluent, which does not bring pollution and reduces the cost.

Description

technical field [0001] The invention relates to an insulating varnish, in particular to a water-soluble insulating varnish using water as a solvent or diluent and a manufacturing method thereof. Background technique [0002] Ordinary oil-soluble resins, such as epoxy resins, alkyd resins, acrylic resins, polyurethanes, and polyester resins, are widely used in the field of insulating materials due to their excellent electrical properties. [0003] However, when used in thermal curing systems, the paint liquid contains a large amount of organic solvents such as toluene and xylene, and a large amount of benzene solvents are used as diluents during use to obtain good impregnation processability. Therefore, when the solvent-based impregnating varnish is cured, most of the solvents are directly volatilized into the air, which seriously pollutes the environment and causes a great waste of resources, and causes great harm to the physical and mental health of the operators, and also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D167/04C09D133/02C09D175/04C09D5/02C09D5/25
Inventor 陆顺平张防罗小锋
Owner SHANGHAI BAOQING TONGYONG ELECTRICAL
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