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Film forming agent and application thereof in semi-inorganic insulating coating liquid for silicon steel

A technology of insulating coating and film-forming agent, used in coatings, anti-corrosion coatings, epoxy resin coatings, etc., can solve problems such as serious carcinogenicity, achieve good leveling and wettability, and improve magnetic properties. , the effect of excellent adhesion

Inactive Publication Date: 2020-02-04
常州广树化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But most of them contain chromate, and Cr 6+ Severely carcinogenic

Method used

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  • Film forming agent and application thereof in semi-inorganic insulating coating liquid for silicon steel

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Embodiment approach

[0024] As an embodiment of the present invention, the film-forming agent is epoxy acrylic acid hybrid emulsion, and its preparation comprises the following steps:

[0025] (1) Preparation of pre-emulsion: add acrylic monomer and epoxy resin into the reaction vessel, stir and mix to obtain mixed monomer, then add water, emulsifier and initiator to it, stir and mix to obtain pre-emulsified liquid;

[0026] (2) Emulsion polymerization: Add water and emulsifier into the reaction vessel, heat up to 80-100°C, add the pre-emulsion obtained in step (1) dropwise to it, after the dropwise addition, keep warm for 1-5h, Post-treatment to obtain the epoxy acrylic hybrid emulsion.

[0027] As an embodiment of the present invention, the acrylic monomer is selected from methyl methacrylate, ethyl methacrylate, propyl methacrylate, isobutyl methacrylate, acrylic acid, methyl acrylate, ethyl acrylate One or more in ester, butyl acrylate; The emulsifier is an anionic emulsifier, preferably cet...

Embodiment 1

[0063] This embodiment provides a semi-inorganic insulating coating liquid for non-oriented silicon steel. In terms of mass percentage, the components of the insulating coating liquid include: 10% film-forming agent, 10% magnesium oxide, 0.1% water-based wax, Phosphoric acid / phosphoric acid ester inorganic substance 1%, compound containing rare earth element 0.1%, organic acid 0.1%, silica sol 1%, balance water.

[0064] In this embodiment, the film-forming agent is epoxy acrylic hybrid emulsion, and its preparation comprises the following steps:

[0065] (1) Preparation of pre-emulsion: Add methyl acrylate and epoxy resin NPEL 128 into the reaction vessel, stir and mix to prepare mixed monomer, then add deionized water, cetyl trimethyl chloride Ammonium, ammonium persulfate, so that the mass percentages of methyl acrylate, epoxy resin NPEL 128, cetyltrimethylammonium chloride and ammonium persulfate are respectively 0.7%, 18%, 2.5%, 1.8%, stirring Mix to obtain a pre-emulsio...

Embodiment 2

[0076] This embodiment provides a semi-inorganic insulating coating solution for non-oriented silicon steel. In terms of mass percentage, the components of the insulating coating solution include: 40% film-forming agent, 20% magnesium oxide, 5% water-based wax, Phosphoric acid / phosphoric acid ester inorganic matter 5%, compound containing rare earth element 3%, organic acid 3%, silica sol 5%, balance water.

[0077] In this embodiment, the film-forming agent and its preparation method are the same as in Embodiment 1.

[0078] In this embodiment, the magnesium oxide is light magnesium oxide, which is purchased from Sinopharm Group.

[0079] In this embodiment, the water-based wax is D-816, which is purchased from Keim, Germany, and its softening point is about 128°C; the average particle size is about 7 microns.

[0080] In this embodiment, the phosphoric acid / phosphate-containing inorganic substance is two kinds of aluminum dihydrogen phosphate and tris(trimethylsilyl)phospha...

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Abstract

The invention provides semi-inorganic insulating coating liquid for non-oriented silicon steel. The insulating coating liquid comprises the ingredients: a film forming agent, magnesium oxide, aqueouswax, phosphoric acid / phosphate containing inorganic matters, a rare-earth element containing compound, organic acid, silica sol and water. According to the insulating coating liquid, the film formingagent can stably present under acidic conditions, is applied to chromium-free insulating coating liquid and has relatively good compatibility with inorganic matters; the prepared chromium-free insulating coating liquid can be stably preserved for 3 months or more at normal temperatures and is good in leveling property and wettability, the surface coating of a non-oriented silicon-steel steel plateis facilitated, and the requirements on sintering and curing temperatures of silicon steel plates and direct cooling can be met after coating operation; and by coating the steel plate with the chromium-free insulating coating liquid provided by the invention, superior adhesive power, corrosion resistance and skin film seepage resistance and excellent properties such as excellent adhesion resistance, lubricity, impact resistance and weldability.

Description

technical field [0001] The invention belongs to the technical field of silicon steel, and in particular relates to a film-forming agent and its application in a semi-inorganic insulating coating liquid for silicon steel. Background technique [0002] Coatings for non-oriented silicon steel have been developed so far, mainly including three types: inorganic coatings composed of inorganic materials; organic coatings composed of resinous substances; semi-inorganic coatings composed of organic and inorganic fusion. The all-inorganic coating has good heat resistance and high lamination coefficient after film formation, but it is easy to fall off when the film is bent, and its adhesion and punching properties are poor; the organic protective layer is easy to adhere, but it is too thick and difficult to connect. C and H substances, so the chemical bonds are easy to break and carbonize under high temperature conditions, which greatly affects the heat resistance; the semi-inorganic c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F220/14C09D163/00C09D133/08C09D5/25C09D5/08C09D7/65C09D7/61
CPCC08F283/10C08K2003/222C08L2205/03C09D5/00C09D5/08C09D7/61C09D7/65C09D163/00C08F220/14C08L33/08C08L91/06C08K13/02C08K3/22C08K3/36C08K5/092
Inventor 刘风广刘凤全
Owner 常州广树化工科技有限公司
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