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Waterborne epoxy impregnating insulating varnish and preparation method thereof

A technology of impregnating insulation and water-based epoxy, which is applied in the field of paint making, can solve the problems of high curing temperature, low mechanical strength, and lower emulsification temperature, and achieve good storage stability, good dilution stability, and low curing temperature.

Active Publication Date: 2016-01-13
湖南沃特邦恩新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current water-based insulating paint has the following disadvantages: 1) Most water-based paints contain co-solvents, or produce harmful organic small molecules during the curing process. It will damage the anti-rust oil on the bearing, accelerate the rust of the bearing, and make the motor produce noise
2) Poor hydrolysis resistance, especially water-based alkyd water-based insulating paint, which is easy to hydrolyze and become mixed after adding water, or even milky white, resulting in poor storage stability; 3) After curing, the mechanical strength is not high and the heat resistance is poor; 4) Water absorption High, so that its electrical insulation performance is poor, especially the electrical insulation after water absorption
Water-based epoxy resin, especially water-based epoxy emulsion, well retains the advantages of epoxy resin, and can solve the problems existing in water-based insulating varnishes such as low mechanical strength, poor hydrolysis resistance, containing co-solvent, unable to achieve 0VOC, etc. question
But also there are following problems: 1) One-component epoxy emulsion involves the problem of latent curing agent. At present, latent curing agent has the contradiction of curing temperature and storage period. The low storage period of curing temperature is short and the storage period is long. The curing temperature is high, it is difficult to achieve medium and low temperature curing and the latent curing agent with good storage life
2) Poor leveling, especially for 0VOC systems, the leveling property of epoxy curing is poor, so the general epoxy emulsion contains some co-solvents, this part of co-solvents can not only reduce the emulsification temperature, but also improve the leveling property of the system
3) The dilution stability is poor. Generally, when it is formulated to 20% solid content, it will sink to the bottom after being placed for 72 hours, and some emulsions may even agglomerate

Method used

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  • Waterborne epoxy impregnating insulating varnish and preparation method thereof
  • Waterborne epoxy impregnating insulating varnish and preparation method thereof
  • Waterborne epoxy impregnating insulating varnish and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1) Preparation of epoxy emulsifier

[0043] Add 2 parts of E51, 4 parts of E44 epoxy resin and 44 parts of polyethylene glycol 4000 into the reaction kettle, raise the temperature to 70°C to melt the polyethylene glycol and mix well with the epoxy resin, then drop 0.1 part of boron trifluoride ethyl ether, continue to stir for 0.5h after the dropwise addition, then raise the temperature to 75°C, and continue the reaction at this temperature for about 3h, take a small amount of product dropwise into water, if turbidity occurs, it means that the reaction has not reached the end, continue React until the product is completely dissolved in water and is transparent. After the product reaches the end point, it is diluted with water to form an emulsifier with a solid content of 50%.

[0044] (2) Preparation of polyvinyl alcohol aqueous solution with 10% solid content

[0045] Add 9 parts of polyvinyl alcohol particles PVA17-88 and 1 part of VA17-99 to 90 parts of water at 75...

Embodiment 2

[0049] 1) Preparation of epoxy emulsifier

[0050] Add 5 parts of E44, 3 parts of E20, 35 parts of Polyethylene Glycol 4000, 10 parts of Polyethylene Glycol 6000 into the reaction kettle, heat up to 70°C to melt the Polyethylene Glycol and fully mix it with the epoxy resin, Then add 0.15 parts of boron trifluoride ethyl ether dropwise, continue to stir for 0.5h after the dropwise addition, then raise the temperature to 85°C, and continue the reaction at this temperature for about 2h, take a small amount of product dropwise into water, if turbidity occurs, it means that the reaction has not yet reached At the end point, continue to react until the product is completely dissolved in water and becomes transparent. After the product reached the end point, it was diluted with water to obtain 47% solid emulsifier.

[0051] (2) Preparation of 13% polyvinyl alcohol aqueous solution

[0052] Add 6 parts of PVA24-88, 4 parts of PVA20-88, and 3 parts of PVA17-99 particles into 87 parts...

Embodiment 3

[0056] 1) Preparation of epoxy emulsifier

[0057] Add 5 parts of E44, 3 parts of E20 epoxy resin, 0.5 parts of E12 and 40 parts of polyethylene glycol 4000, 10 parts of polyethylene glycol 6000 into the reaction kettle, heat up to 70 °C to melt polyethylene glycol and mix with Mix the epoxy resin well, then add 0.2 parts of boron trifluoride diethyl ether dropwise, continue to stir for 0.5h after the dropwise addition, then raise the temperature to 90°C, and continue to react at this temperature for about 2h, take a small amount of product dropwise into water , if turbidity appears, it means that the reaction has not reached the end, continue to react until the product is completely dissolved in water and becomes transparent. After the product reached the end point, it was diluted with water to obtain 54% solid emulsifier.

[0058] (2) Preparation of 8% polyvinyl alcohol aqueous solution

[0059] Add 1 part of PVA24-88, 3 parts of PVA20-88, 3 parts of PVA17-88, and 1 part o...

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Abstract

The invention discloses waterborne epoxy impregnating insulating varnish and a preparation method thereof. The waterborne epoxy impregnating insulating varnish is water-borne epoxy latex formed by epoxy resin, water, latent curing agents, accelerant, epoxy emulsifier, a polyvinyl alcohol water solution, other auxiliaries and the like, and the water-borne epoxy latex is free of VOC, good in stability, low in curing temperature and high in speed. The waterborne epoxy impregnating insulating varnish is simple in preparation method and low in cost and meets industrial production and application requirements.

Description

technical field [0001] The invention relates to a water-based epoxy impregnated insulating paint and a preparation method thereof, belonging to the technical field of paint making. Background technique [0002] Traditional impregnated insulating varnishes generally use toluene, xylene, styrene, solvent oil, etc. as diluents. These diluents are flammable, explosive, toxic and harmful organic solvents. They are directly discharged into the Atmosphere not only causes environmental pollution, but also has great harm to human health. According to statistics, tens of thousands of tons of organic solvents are discharged into the atmosphere every year, resulting in a great waste of resources. In addition, there are still potential safety hazards in the use and storage of solvent-based insulating varnishes. [0003] Water-based impregnated insulating varnish uses water as a solvent. Compared with traditional solvent-based insulating varnish, it can greatly reduce VOC emissions, effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D5/25C09D7/12C09D7/00
Inventor 颜志红肖飞铭丁新良谭骞刘成徐勇
Owner 湖南沃特邦恩新材料有限公司
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