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High temperature resistant annealing treated single-component chromium-free water-based silicon steel sheet insulating coating solution

An annealing, one-component technology, used in coatings, polyester coatings, epoxy coatings, etc., can solve problems such as gaps, and achieve excellent performance, improved stability, and complete curing effects.

Inactive Publication Date: 2009-07-22
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the chromium-containing coating, there is still a certain gap in some properties, mainly in three aspects: high temperature resistance, rust resistance, and welding speed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation of acrylic resin emulsion: 62g methyl methacrylate, 32g butyl acrylate, 3g hydroxyethyl acrylate, 3g acrylic acid are mixed uniformly to obtain mixed monomer, and initiator potassium persulfate 0.5g (consumption is 0.5% of monomer ) was added with 62 g of water to obtain a 0.8% aqueous solution.

[0028] Add 333.5g of water to a 1000ml four-neck flask equipped with a stirrer, thermometer, constant pressure dropping funnel and reflux condenser, add 2.86g of sodium dodecylbenzenesulfonate, 1.14g of OP-10 emulsifier, nitrogen atmosphere Heat it up to about 45°C, add 20% of the mixed monomer at one time and stir for 20 minutes, then raise the temperature to 80-85°C, add 25% of the initiator aqueous solution at one time, stir and react for 30 minutes and the system appears blue light, at this time Start to slowly add the remaining mixed monomer and initiator solution dropwise, and finish dropping within about 1-2 hours. After the dropwise addition, keep the ...

Embodiment 2

[0030] Preparation of vinegar-acrylic emulsion: mix 16 g of vinyl acetate, 50 g of methyl methacrylate, 20 g of butyl acrylate, 4 g of hydroxyethyl acrylate, 2 g of acrylic acid, and 8 g of glycidyl methacrylate to obtain a mixed monomer.

[0031] The rest of the raw materials and preparation method are the same as in Example 1 to obtain a vinegar-acrylic emulsion with a solid content of 20%.

Embodiment 3

[0033] Preparation of self-emulsifying styrene-acrylic resin aqueous dispersion: styrene 15g, methyl methacrylate 50g, butyl acrylate 10g, hydroxyethyl acrylate 13g, acrylic acid-N, N-dimethylaminoethyl 12g mixed to obtain Mix the monomers, then add 4 g of the initiator azobisisobutyronitrile into the mixed monomers, stir to make it dissolve, and set aside.

[0034] Add 45g of butanol into a 500ml four-necked flask equipped with a stirrer, thermometer, constant pressure dropping funnel and reflux condenser, blow nitrogen, raise the temperature to 80-85°C, add about 15% of mixed monomers and trigger Agent mixed solution, keep warm for about 30 minutes, then slowly add the remaining mixed monomer and initiator solution dropwise for a total of 3 hours, and then react for 4 hours after the monomer is dropped, after the reaction is completed, the temperature is lowered to below 50°C, and the nitrogen gas is stopped. , a solution of 5 g of acetic acid and 28.3 g of water was added a...

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PUM

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Abstract

A high-temperature annealing treatment resistant single-component chromium-free aqueous silicon steel sheet insulated masking liquid is characterized in that the main ingredients include organic resin, inorganic water dispersion liquid, curing agent and other additives. The weight ratio of the components is as follows: 100 parts of the organic resin, 100-400 parts of inorganic matter, 5-30 parts of the curing agent, 1-20 parts of additive surface active agent and the rest of water, and the solid content of the masking liquid is 30-50 percent. The masking liquid does not contain toxic organic solvent and chromate, has excellent performances of coating appearance, adhesion, salt spray resistance, insulativity and the like, and can still keep good insulativity after going through high-temperature stress annealing process. After a high-temperature annealing experiment (nitrogen atmosphere, 750 DEG C / 2h), the interface resistance retention value is more than 70 percent. The curing speed of the masking liquid is fast, the curing is thorough, and the surface of the membranous layer does not turn sticky for a long time of placement after curing. The masking liquid is in the form of single component, has convenient use and can be stored for long time.

Description

technical field [0001] The invention relates to a single-component chromium-free water-based insulating coating solution for silicon steel sheets that is resistant to high temperature annealing treatment. Specifically, it refers to coating on silicon steel sheets. After two hours of heat treatment at 750°C under nitrogen, the interlayer resistance value remains More than 70% one-component chromium-free water-based insulating coating solution. Background technique [0002] Silicon steel sheets are mainly used in the manufacture of various motors, transformers and ballast cores as well as various electrical components. The surface of the silicon steel sheet must be coated with a thin layer (0.5-5μm) of insulating coating, so that the silicon steel sheet has a high surface resistivity, and the power loss between the silicon steel sheets is minimized. During transportation and use, it is protected from various corrosive media and prevents rust. [0003] Generally speaking, the...

Claims

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Application Information

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IPC IPC(8): C09D133/02C09D133/08C09D167/00C09D163/00C09D5/25
Inventor 张墩明韩晓光光红兵胡志强王俊文王政杨昌正
Owner NANJING UNIV
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