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Water-soluble environment-friendly self-bonding insulating coating for silicon steel

An insulating coating and water-soluble technology, applied in the field of water-soluble environmentally friendly self-adhesive insulating coatings, can solve the problems of poor longitudinal thickness difference of the iron core, overflowing of the hot-pressed edge of the coating, etc., so as to improve the mechanical protection and adhesion. The effect of strength improvement and high insulation

Active Publication Date: 2019-10-11
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a water-soluble environmentally friendly self-adhesive insulating coating for silicon steel, which solves the problems of overflow of the hot-pressed edge of the coating caused by the high film thickness of the existing coating, and poor longitudinal thickness difference of the iron core. The coating can produce self-adhesive coating products that are thin and sticky, highly insulating, and have no edge overflow, improve user conditions such as temperature, time, and load force in the iron core curing molding process, and expand silicon steel self-adhesive insulating coatings Product application breadth and depth

Method used

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  • Water-soluble environment-friendly self-bonding insulating coating for silicon steel
  • Water-soluble environment-friendly self-bonding insulating coating for silicon steel
  • Water-soluble environment-friendly self-bonding insulating coating for silicon steel

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Experimental program
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Embodiment ( 1

[0047] The coating formula composed of thermosetting water-based film-forming resin, thermoplastic water-based film-forming resin, inorganic nanoparticles, additives and solvents, and water is shown in Tables 1-2. The various components are mixed and stirred evenly to prepare the coating liquid for use (the inorganic nanoparticles can be dispersed in pure water at high speed first, and then added in the form of dispersion liquid).

[0048] The preparation method of copolymeric elastomer I in Table 1 is as follows: after dehydrating 1.05 mol polyester diol (Shichao Chemical CT-EP1000) and 1.0 mol dimethylol propionic acid at 105°C and a vacuum of 0.09 MPa for 1.0 h , lower the temperature to 30°C, add dry 0.675mol hexamethylene diisocyanate, react at 70°C for 4 hours; then add 0.675mol neopentyl glycol and 0.675mol trimethylolpropane at this temperature to extend the chain, After reacting for 3.5 hours, polyester / polyurethane / urea copolymerized elastomer I was obtained. The cop...

Embodiment

[0052] Embodiment (two) compares the impact of different film thicknesses on the performance of coating processing

[0053] Select the coating formula of embodiment 3 and comparative example 3, the coating solution is coated on the surface of M300-35A high-grade silicon steel sheet coil by two-roller or three-roller type roller coating machine, adopt open flame baking oven or infrared drying oven at 180~260 Under the condition of ℃ board temperature, it is baked once and cured to form a film, and it can be adjusted to obtain different coating film thickness boards. The secondary curing adopts the conventional curing process outside the mold, with a pressure load of 4 Bar and a heat preservation of 1.5 hours at 200°C.

[0054] When the film thickness is 3μm, the insulation is measured by ASTM A717 standard, and the surface insulation resistance is ≥30Ω.cm 2 / piece, with high insulation.

[0055] The relationship between the coating bond strength (using the ISO 11339 standard...

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Abstract

A water-soluble environment-friendly self-bonding insulating coating for silicon steel comprises thermosetting water-based film-forming resin, thermoplastic water-based film-forming resin, inorganic nanoparticles, an auxiliary agent, a solvent and pure water, wherein the solid weight of the thermosetting water-based film-forming resin accounts for 0.1-50% of the total weight of the coating, the solid weight of the thermoplastic water-based film-forming resin accounts for 0.1-60% of the total weight of the coating, the solid weight of the inorganic nanoparticles accounts for 0.1-10% of the total weight of the coating, and the weight of the auxiliary agent and the solvent accounts for 5-25% of the total weight of the coating. The coating provided by the invention can be used for producing the self-bonding coating product which is thin and sticky, high in insulation and free of edge overflowing, and does not need to load excessive pressure and excessive temperature when iron cores are subjected to secondary curing forming after being stacked, the curing time is shortened, the use conditions of users are reduced, and the processing efficiency of the iron cores is improved.

Description

technical field [0001] The invention relates to a water-soluble environment-friendly self-adhesive insulating coating for silicon steel. Background technique [0002] Modern mass-produced motor core stacking and forming mainly include bolt connection, welding, riveting and bonding. It has the advantages of high core fixing strength, low magnetic vibration noise, and high iron core efficiency. It is especially suitable for situations where other fixing methods will cause distortion or insufficient rigidity, and are not convenient for riveting or welding. [0003] Coating self-adhesive coatings on the surface of silicon steel sheets is a common method to achieve fixed molding between silicon steel sheets by bonding, but there are also the following problems: the cost of imported self-adhesive coated silicon steel is high, and the iron core is stacked and formed. The process is cumbersome and the work efficiency is low. The relatively thick self-adhesive coating will cause the...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D163/00C09D5/25C09D7/61C09D7/20
CPCC09D175/06C09D163/00C09D5/00C09D7/61C09D7/20C08K2201/011C08L63/00C08K3/22C08L75/06C08G18/08C09D133/00C09D123/0853C08L23/0853C08L33/04C09D7/63
Inventor 李登峰王波李国保郭建国肖盼沈科金谢世殊
Owner BAOSHAN IRON & STEEL CO LTD