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Water-soluble silicon steel sheet insulating paint and preparation method thereof

A silicon steel sheet and insulating varnish technology, which is applied in the direction of insulators, coatings, electrical components, etc., can solve the problems of poor paint film adhesion, low non-volatile content, poor storage stability, etc., and achieve uniform and stable storage. High, life-prolonging effect

Inactive Publication Date: 2016-04-13
ZHEJIANG RONGTAI TECH ENTERPRISE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One object of the present invention is to provide a water-soluble insulating varnish for silicon steel sheets, using polyurethane-modified water-soluble epoxy with excellent adhesion and good flexibility as a dispersion, compounding fillers with different particle sizes, and adding high-efficiency wetting Dispersant, which solves the problems of ordinary water-soluble silicon steel sheet paints such as high viscosity, low non-volatile content, poor storage stability, easy sedimentation, and poor adhesion of the paint film.

Method used

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  • Water-soluble silicon steel sheet insulating paint and preparation method thereof
  • Water-soluble silicon steel sheet insulating paint and preparation method thereof
  • Water-soluble silicon steel sheet insulating paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolve 100g of 4,4'-diphenylmethane diisocyanate and 250g of polycaprolactone diol with a molecular weight of 1000 in 50g of N-methylpyrrolidone, and react at 60°C until the content of isocyanate group (-NCO) reaches a stable value to obtain Polyurethane prepolymer, denoted as PU-1.

[0023] Under the protection of nitrogen, mix 100g epoxy resin E51 and 60g polyurethane prepolymer PU-1 evenly, after reacting at 75°C for 3 hours, add isobutanol and 2% benzoyl peroxide, and dissolve 40g Add methacrylic acid and 56g butyl acrylate into the polyurethane modified epoxy resin system. After 0.5 hours of dripping, keep warm for 4.5 hours, cool down to 50°C, neutralize with ANP-95 to pH 9.1, add water , to obtain a polyurethane-modified aqueous epoxy resin dispersion with a non-volatile content of 46.12%.

[0024] Mix 36 parts of the above-mentioned polyurethane modified water-based epoxy dispersion, 5 parts of M-16, and 3 parts of additives evenly, and add 56 parts of compos...

Embodiment 2

[0026] Under the protection of nitrogen, mix 100g epoxy resin E51 and 48g polyurethane prepolymer PU-1 evenly, after reacting at 80°C for 2.5 hours, add isobutanol and 2% benzoyl peroxide, and dissolve 37g Add methacrylic acid and 51.8g butyl acrylate into the polyurethane modified epoxy resin system dropwise. After 0.5 hours of dripping, after 4 hours of heat preservation reaction, cool down to 50°C, neutralize with ANP-95 until the pH value is 8.4, add An appropriate amount of water was used to obtain a polyurethane-modified aqueous epoxy resin dispersion with a non-volatile content of 43.34%.

[0027] Mix 33 parts of the above-mentioned polyurethane modified water-based epoxy dispersion, 6 parts of M-16, and 4 parts of additives evenly, and add 57 parts of composite inorganic fillers to disperse evenly. The addition amount of wetting and dispersing agent SN-5027 is 2 parts.

Embodiment 3

[0029] Under the protection of nitrogen, mix 100g epoxy resin E51 and 75g polyurethane prepolymer PU-1 evenly, after reacting at 80°C for 3 hours, add isobutanol and 2% benzoyl peroxide, at 115°C, 43.75 1 g of methacrylic acid and 61.25 g of butyl acrylate were dropped into the polyurethane modified epoxy resin system. After 1 hour of dripping, after 4.5 hours of heat preservation reaction, the temperature was lowered to 50°C, and the pH value was neutralized to 8.9 with ANP-95. An appropriate amount of water was added to obtain a polyurethane-modified aqueous epoxy resin dispersion with a non-volatile content of 47.58%.

[0030] Mix 35.5 parts of the above-mentioned polyurethane modified water-based epoxy dispersion, 5.5 parts of M-16, and 3.5 parts of additives evenly, and add 55.5 parts of composite inorganic fillers to disperse evenly. The addition amount of wetting and dispersing agent SN-5027 is 1.5 parts.

[0031] The properties of the silicon steel sheet paint prepare...

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Abstract

The invention relates to a water-soluble silicon steel sheet insulating paint which comprises the following components in parts by weight: 32-36 parts of water-based resin dispersion, 5-7 parts of hydrazide curing agent, 55-58 parts of inorganic filler and 1-5 parts of assistant. By using the polyurethane modified epoxy resin as the dispersion base, since the polyurethane has the characteristics of excellent adhesiveness and excellent flexibility, the modified water-soluble silicon sheet paint film has high adhesiveness, can not easily peel under the action of punching vibrations or external force, and implements favorable insulation effect. The motor has the advantages of longer service life and high reliability.

Description

technical field [0001] The invention relates to an insulating resin, in particular to a water-soluble insulating varnish for silicon steel sheets, which has the characteristics of low viscosity, good stability and high adhesion. Background technique [0002] With the increase of the capacity of large motors, the requirements for the reliability of the motor stator core are also gradually increasing, which mainly depends on the performance of the surface coating material of the silicon steel sheet used to prepare the motor core. Based on the continuous improvement of requirements for environmental protection, hot-pressing shrinkage and heat resistance of silicon steel sheets, most of the paint solutions currently used for surface insulation of silicon steel sheets are water-soluble semi-inorganic silicon steel sheet varnishes containing fillers. However, such silicon steel sheet varnishes are usually With high viscosity and low non-volatile content, the paint solution is pron...

Claims

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Application Information

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IPC IPC(8): C09D151/08C09D5/25C09D7/12C08F283/00C08F220/18C08F220/06C08G18/42C08G18/10C08G18/58
CPCC08F283/00C08G18/10C08G18/4277C08K3/22C08K3/30C08K2003/2241C08K2003/3045C08K2201/014C09D7/40C09D7/61C09D7/67C09D151/08H01B3/308C08G18/58C08F220/1804
Inventor 马苗金丹华袁李岩徐伟刘攀登
Owner ZHEJIANG RONGTAI TECH ENTERPRISE
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