Insulation coating composition for electrical steel

A composite, electrical steel sheet technology, applied in inorganic insulators, organic insulators, nanotechnology for materials and surface science, etc., to achieve the effects of low stack shrinkage, good pressure resistance, and excellent corner coverage

Active Publication Date: 2010-09-29
AXALTA COATING SYST GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Known systems cannot combine different technical requirements such as welding, clamping, interlocking, punching, riveting, pressure resistance and heat resistance to provide high performance standards

Method used

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  • Insulation coating composition for electrical steel
  • Insulation coating composition for electrical steel
  • Insulation coating composition for electrical steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 6

[0063] Preparation of the coating of the present invention based on C5 electrical insulating varnish

[0064] A dispersion of aliphatic polyurethane (a water-based system with a solids content of 34 to 40% by weight) was mixed with a dispersion of nanoscale silica (a basic water-based system with a solids content of 35 to 40% by weight). A crosslinking agent (solids content 35 to 100% by weight), pigments, fillers and additives are added to the mixture, wherein 0.5 to 1.5 parts by weight of coated silica gel is used as welding additive, 0 to 3 parts by weight Aminocarboxyl compounds are used as corrosion inhibitor additives and 0 to 2 parts by weight of defoamer additives. The mixture was stirred well to provide six different coating compositions of the present invention as C5 paints with different crosslinkers.

[0065] The paint composition is shown in Table 1. The dosage is in parts by weight.

[0066] Table 1 :

[0067]

[0068] Each coating composition listed i...

Embodiment 7 to 10

[0076] Preparation of the coating of the present invention based on C6 electrical insulating varnish

[0077] The preparation method is the same as described in Examples 1 to 6. Stir the mixture and grind until smooth.

[0078] The composition of the C6 paint with different crosslinkers is shown in Table 3. The dosage is in parts by weight.

[0079] table 3 :

[0080]

[0081] Using the same methods and conditions as described in Examples 1 to 6, the coating compositions shown in Table 3 were applied to electrical steel panels and cured thereon to form coatings having a dry film thickness of 6 μm (+ / -0.7). insulation layer. After curing, the coated steel plates are stacked and assembled by welding to form the core.

[0082] The technical performance compared with the prior art is described in Table 4.

[0083] Table 4 :

[0084]

Embodiment 11 to 14

[0086] Preparation of the coating of the present invention based on C3 electrical insulating varnish

[0087] The preparation method is the same as described in Examples 1 to 6.

[0088] The composition of C3 paints with different crosslinkers is described in Table 5. The dosage is in parts by weight.

[0089] table 5 :

[0090]

[0091] Using the same method and conditions as described in Examples 1 to 6, the coating composition shown in Table 5 was applied to electrical steel panels and cured thereon to form a coating having a dry film thickness of 4 μm (+ / -0.4). Insulation. After curing, the coated steel plates are stacked and assembled by welding to form the core.

[0092] The technical performance compared to the prior art is described in Table 6.

[0093] Table 6 :

[0094]

[0095]

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Abstract

The invention provides a coating composition to coat electrical steel sheets, the composition comprising: A) 5 to 45 weight% of at least one binder resin, B) 0.1 to 40, preferably 1 to 30 weight% of nano scaled particles, the particles having an average radius ranging from 1 to 300 nm, C) at least one cross-linking agent in an amount able to cross-link with the binder resin, preferably 0.1 to 30 weight% of at least one cross-linking agent, D) 0.1 to 60 weight% of at least one additive and / or pigment and / or filler, and E) 5 to 70 weight% of water and / or at least one solvent, the weight% based on the total weight of the composition. The composition according to the invention makes it possible to provide a high property profile standard combining the different technical requirements such as high ability for welding, clamping, interlocking, punching, riveting, high pressure, thermal resistance of electrical steel sheets coated with the composition according to the invention and of cores produced from these coated electrical steel sheets.

Description

field of invention [0001] The present invention relates to a universal core varnish for coating electrical steel sheets to prepare steel sheet cores used in electrical equipment, which can limit hysteresis and eddy current losses by improving insulation properties. Background of the invention [0002] Electrical steel sheet varnishes for coating individual electrical steel sheets are known. Coated electrical steel sheets can be assembled together by different technical methods such as welding, clamping, interlocking, aluminum die casting or riveting to form solid cores used in electrical devices such as transformers, generators and electric motors. The coating provides electrical insulation between the metal plates in the core and should meet the requirements for high surface insulation resistance, mechanical stress resistance and bond strength. [0003] JP-A 0733696, JP-A 2000345360 and EP-A 923088 relate to enamels for coating electrical steel sheets, wherein the enamels ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/36C08K13/00H01B3/08H01B3/44C08K5/29C08K5/3412C09D7/12C09D175/04C08L33/06C08L61/28C08L63/02C08L75/04
CPCC08L75/04C08K3/34C09D175/04C08K2201/011C08G2150/90C08K5/17H01F1/18C08L63/00H01B3/30C08L61/28B82Y30/00C08L33/06C08K2003/2227C09D5/084C21D8/1283C21D9/46Y10T428/31678C08L2666/20C08L2666/16C08L2666/22C09D133/04H01B3/44
Inventor F·贝姆B·弗罗普尔R·沃尔纳N·A·范齐尔
Owner AXALTA COATING SYST GMBH
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