CN112642674A - Vertical drying and curing process for low-temperature chromium-free environment-friendly insulating coating of non-oriented silicon steel - Google Patents

Vertical drying and curing process for low-temperature chromium-free environment-friendly insulating coating of non-oriented silicon steel Download PDF

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CN112642674A
CN112642674A CN202011535787.3A CN202011535787A CN112642674A CN 112642674 A CN112642674 A CN 112642674A CN 202011535787 A CN202011535787 A CN 202011535787A CN 112642674 A CN112642674 A CN 112642674A
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temperature
vertical drying
insulating coating
low
free environment
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CN112642674B (en
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商存亮
戚新军
崔占利
张学成
常志禄
李龙飞
孟晓涛
纪云龙
陈战锋
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Angang Group Cold Rolling Co ltd
Anyang Iron and Steel Co Ltd
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Angang Group Cold Rolling Co ltd
Anyang Iron and Steel Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254After-treatment
    • B05D3/0272After-treatment with ovens
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254After-treatment
    • B05D3/0263After-treatment with IR heaters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/12Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a coating with specific electrical properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26Methods of annealing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00Metallic substrate
    • B05D2202/10Metallic substrate based on Fe

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Abstract

The invention provides a vertical drying and curing process for a low-temperature chromium-free environment-friendly insulating coating of non-oriented silicon steel. The thickness of the low-temperature chromium-free environment-friendly insulating coating is 0.8-1.0 mu m; furnace temperature of each section of the vertical drying furnace: the temperature of a first-stage heating furnace is 420-450 ℃, the temperature of a second-stage heating furnace is 460-490 ℃, the temperature of a third-stage heating furnace is 500-530 ℃, the temperature of a third-stage heating outlet plate is 200-240 ℃, and the temperature of a cooling section outlet plate is 60-65 ℃; heating time of each section of the vertical drying furnace: the heating time of the first heating section, the second heating section and the third heating section is 3.5-4 s. The process of the invention can ensure the uniform coating of the steel strip, ensure that the coating of the final product has excellent insulativity, corrosion resistance, adhesiveness, punching property, weldability and heat resistance, meet the requirements of downstream procedures, improve the product percent of pass, reduce waste products and ensure the smooth production.

Description

Vertical drying and curing process for low-temperature chromium-free environment-friendly insulating coating of non-oriented silicon steel
Technical Field
The invention belongs to a drying and curing technology of a non-oriented silicon steel insulating coating, and particularly relates to a vertical drying and curing process of a non-oriented silicon steel low-temperature chromium-free environment-friendly insulating coating.
Background
The cold-rolled non-oriented silicon steel is an important raw material in the industries of domestic appliances, various types of motors, electronic products and the like, and the quality of the surface coating directly influences the performances of punching sheets, overlapping, insulation resistance and the like of the motor or the motor iron core. The silicon steel coating is required to have excellent insulation, corrosion resistance, adhesion, punching, welding, heat resistance and the like.
At present, the most widely applied non-oriented silicon steel coating in China is a semi-organic chromium-containing coating, and although the chromium-containing coating meets various performance requirements of the non-oriented silicon steel coating, hexavalent chromium contains toxicity, so that water sources are polluted and harm is caused. With the increasingly deep idea of environmental protection concept, the chromium-free environment-friendly insulating coating becomes a hot spot for research on non-oriented silicon steel insulating coatings.
At present, domestic non-oriented silicon steel is usually produced on a horizontal unit and is provided with a special insulating coating machine and a horizontal drying furnace. The drying and curing process is basically finished on a horizontal drying furnace by adopting the conventional chromium-containing insulating coating or the chromium-free environment-friendly insulating coating, and the plate temperature is required to be basically 320-360 ℃.
With the development of metallurgical technology, chromium-free environment-friendly insulating coatings capable of meeting lower curing temperature are being developed and developed, and corresponding low-temperature drying and curing processes are also being developed and developed.
Disclosure of Invention
The invention aims to provide a vertical drying and curing process for a low-temperature chromium-free environment-friendly insulating coating of non-oriented silicon steel. When the invention is used for producing non-oriented silicon steel products, the compatible function of the vertical galvanizing unit is fully exerted, the investment is saved, the risk is reduced, the requirement of developing and producing cold-rolled non-oriented silicon steel is met, and the successful precedent of domestic industry is created.
In order to achieve the purpose, the invention adopts the technical scheme that:
a vertical drying and curing process for a low-temperature chromium-free environment-friendly insulating coating of non-oriented silicon steel is completed in a vertical galvanizing unit, a cold-rolled non-oriented silicon steel coil is subjected to recrystallization annealing through a vertical annealing furnace, then is coated with the low-temperature chromium-free environment-friendly insulating coating through a coating machine in sequence, and is dried and cured through a first heating section of a vertical drying furnace, a second heating section of the vertical drying furnace, a third heating section of the vertical drying furnace and a cooling section.
Further, the low-temperature chromium-free environment-friendly insulating coating is preparedThe low-temperature chromium-free environment-friendly insulating coating liquid has the solid content of 20 percent, the inorganic matter content of 40 percent and the density of 1.2g/cm3Viscosity was 10s and pH 3.
Further, the drying and curing process specifically comprises the following steps:
(1) the thickness of the strip steel is 0.5 mm;
(2) controlling the running speed of the strip steel to be 60-65 mpm;
(3) the thickness of the low-temperature chromium-free environment-friendly insulating coating is 0.8-1.0 mu m;
(4) furnace temperature of each section of the vertical drying furnace: the temperature of a first heating section of the vertical drying furnace is 420-450 ℃, the temperature of a second heating section of the vertical drying furnace is 460-490 ℃, and the temperature of a third heating section of the vertical drying furnace is 500-530 ℃;
(5) heating three sections of outlet plates by a vertical drying furnace at the temperature of 200-240 ℃;
(6) and the temperature of an outlet plate of the cooling section is 60-65 ℃.
Further, the heating time of the first heating section, the second heating section and the third heating section is 3.5-4 s.
Compared with the prior art, the invention has the beneficial effects that:
at present, the semi-organic insulating coating of inorganic salt and organic salt is mainly adopted at home, when the semi-organic insulating coating is sintered, the semi-organic insulating coating is heated at the speed of less than 15-20 ℃/s before being heated to 130 ℃, and then the heating speed is increased to 250-450 ℃ at the speed of 25-30 ℃/s, so that water in coating liquid is fully evaporated before the insulating film is hardened, the cracking and the holes of the surface layer of the insulating film are prevented, and the adhesiveness and the insulativity are improved. In the chromium-containing coating added with the reducing agent, hexavalent chromium begins to be reduced and converted into trivalent chromium at the temperature of 260-320 ℃, the curing temperature is over 320 ℃ to ensure that the hexavalent chromium is fully reduced, and the curing temperature is actually controlled at 320-360 ℃ because resin in the coating is decomposed at over 360 ℃.
The low-temperature chromium-free environment-friendly insulating coating is adopted, the problem that hexavalent chromium is reduced and converted into trivalent chromium does not exist, the curing temperature can be properly reduced, and in addition, the coating thickness and the temperature uniformity of the front and back surfaces of the strip steel are ensured because the drying furnace is a vertical far-infrared electric heating furnace. Through a plurality of tests and groping, the optimal low-temperature chromium-free environment-friendly insulating coating vertical drying and curing process is finally determined.
The vertical drying and curing process is simple and reasonable, the operation is convenient, and when the vertical galvanizing unit is adopted to produce the non-oriented silicon steel, recrystallization annealing is completed through the vertical annealing furnace, and then the coating machine is used for coating the low-temperature chromium-free environment-friendly insulating coating, and the coating machine enters the vertical drying furnace to complete drying and curing. The coating of the final product has excellent insulation, corrosion resistance, adhesion, punching property, weldability and heat resistance, and completely meets the requirements of downstream processes.
Drawings
FIG. 1 is a schematic view of a vertical drying and curing process of a low-temperature chromium-free environment-friendly insulating coating of non-oriented silicon steel according to the present invention;
in the figure, 1, a coating machine, 2, a vertical drying furnace heating first section, 3, a vertical drying furnace heating second section, 4, a vertical drying furnace heating third section, 5 and a cooling section.
Detailed Description
The technical solutions and effects of the present invention will be further described with reference to the drawings and specific embodiments, but the scope of the present invention is not limited thereto.
The vertical drying and curing process of the low-temperature chromium-free environment-friendly insulating coating of the non-oriented silicon steel is completed in a vertical galvanizing unit. A cold-rolled non-oriented silicon steel coil with the thickness of 0.5mm is subjected to recrystallization annealing through a vertical annealing furnace, then sequentially subjected to low-temperature chromium-free environment-friendly insulating coating through a coating machine 1, and then subjected to drying and curing through a vertical drying furnace heating section 2, a vertical drying furnace heating section 3, a vertical drying furnace heating section 4 and a cooling section 5, so that the performance of the obtained coating can meet the requirements of downstream users. Table 1 shows the vertical dry cure process and finished coating properties of examples 1 and 2 of the present invention.
TABLE 1 vertical drying and curing Process and finished coating Properties according to the inventive examples
Examples 1 2
Steel grade brand 50W800 50W470
Strip steel specification 0.5×1200mm 0.5×1200mm
Speed of the machine 62mpm 65mpm
Low-temperature chromium-free environment-friendly insulating coating thickness 0.9μm 1.0μm
First-stage heating furnace temperature 425℃ 435℃
Two-stage heating furnace temperature 465℃ 475℃
Three-stage furnace temperature 505℃ 515℃
Heating three-stage outlet plate temperature 215℃ 220℃
Outlet plate temperature of cooling section 60℃ 63℃
Heating for a heating time 4s 3.7s
Heating for two-stage heating time 4s 3.7s
Three stages of heating time 4s 3.7s
Finished product surface resistance (front) 2.6~2.8Ω/cm2 2.7~2.9Ω/cm2
Finished product surface resistance (reverse side) 2.6~2.8Ω/cm2 2.7~2.9Ω/cm2
Adhesion of finished coating Class A Class A
Finished product annealed surface resistance (front) 1.8~1.9Ω/cm2 1.9~2.0Ω/cm2
Finished product annealed surface resistance (reverse side) 1.8~1.9Ω/cm2 1.9~2.0Ω/cm2
Coating adhesive force after finished product is removed Class B Class B
The low-temperature chromium-free environment-friendly insulating coating can adopt CN112011250A low-temperature chromium-free environment-friendly insulating coating liquid, and the low-temperature chromium-free environment-friendly insulating coating comprises the following raw materials in percentage by mass: 30 to 80 percent of water-soluble phosphate, 5 to 45 percent of water-soluble polyol modified epoxy resin, 3 to 6 percent of acidic silica sol, 1.2 to 2 percent of corrosion inhibitor, 2.4 to 4 percent of catalyst, 0.4 to 0.6 percent of wetting agent, 0.8 to 1.2 percent of defoaming agent and the balance of deionized water. The solid content is 20%, the inorganic matter content is 40%, and the density is 1.2g/cm3Viscosity was 10s and pH 3.
The vertical drying and curing process is simple and reasonable, the operation is convenient, and when the vertical galvanizing unit is adopted to produce the non-oriented silicon steel, recrystallization annealing is completed through the vertical annealing furnace, and then the coating machine is used for coating the low-temperature chromium-free environment-friendly insulating coating, and the coating machine enters the vertical drying furnace to complete drying and curing. The coating of the final product has excellent insulation, corrosion resistance, adhesion, punching property, weldability and heat resistance, and completely meets the requirements of downstream processes.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The vertical drying and curing process of the low-temperature chromium-free environment-friendly insulating coating of the non-oriented silicon steel is characterized in that the process is completed in a vertical galvanizing unit, a cold-rolled non-oriented silicon steel coil is subjected to recrystallization annealing through a vertical annealing furnace, then is coated with the low-temperature chromium-free environment-friendly insulating coating through a coating machine in sequence, and is dried and cured through a first heating section of a vertical drying furnace, a second heating section of the vertical drying furnace, a third heating section of the vertical drying furnace and a cooling section.
2. The vertical drying and curing process for the low-temperature chromium-free environment-friendly insulating coating of the non-oriented silicon steel as claimed in claim 1, wherein the low-temperature chromium-free environment-friendly insulating coating adopts a low-temperature chromium-free environment-friendly insulating coating solution, the solid content is 20%, the inorganic matter content is 40%, and the density is 1.2g/cm3Viscosity was 10s and pH 3.
3. The vertical drying and curing process for the non-oriented silicon steel low-temperature chromium-free environment-friendly insulating coating according to claim 1, characterized in that the drying and curing process specifically comprises the following steps:
(1) the thickness of the strip steel is 0.5 mm;
(2) controlling the running speed of the strip steel to be 60-65 mpm;
(3) the thickness of the low-temperature chromium-free environment-friendly insulating coating is 0.8-1.0 mu m;
(4) furnace temperature of each section of the vertical drying furnace: the temperature of a first heating section of the vertical drying furnace is 420-450 ℃, the temperature of a second heating section of the vertical drying furnace is 460-490 ℃, and the temperature of a third heating section of the vertical drying furnace is 500-530 ℃;
(5) heating three sections of outlet plates by a vertical drying furnace at the temperature of 200-240 ℃;
(6) and the temperature of an outlet plate of the cooling section is 60-65 ℃.
4. The vertical drying and curing process for the non-oriented silicon steel low-temperature chromium-free environment-friendly insulating coating according to claim 3, wherein the heating time of the first heating section, the second heating section and the third heating section is 3.5-4 s.
CN202011535787.3A 2020-12-23 2020-12-23 Vertical drying and curing process for low-temperature chromium-free environment-friendly insulating coating of non-oriented silicon steel Active CN112642674B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116099741A (en) * 2021-11-09 2023-05-12 北京科益虹源光电技术有限公司 Insulating coating method and equipment for nanocrystalline magnetic core strip

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101209440A (en) * 2006-12-27 2008-07-02 鞍钢股份有限公司 Coating method of cold-rolled silicon steel chromium-free insulating coatings, coating rubber roll and coating liquid
CN103436070A (en) * 2013-09-09 2013-12-11 湖北武洲表面处理材料有限公司 Non-oriented silicon steel with insulating coating containing organic coloring agent and preparation method thereof
CN107245646A (en) * 2017-06-01 2017-10-13 东北大学 A kind of preparation method of the circumferential high-magnetic induction, low-iron loss non-orientation silicon steel of plate face
CN109836937A (en) * 2019-02-27 2019-06-04 武汉圆融科技有限责任公司 A kind of chrome-free insulating masking liquid and preparation method thereof and orientation free silicon steel plate
CN110885571A (en) * 2019-09-30 2020-03-17 武汉钢铁有限公司 Energy-saving non-oriented silicon steel coating liquid and preparation method and application thereof
CN112011250A (en) * 2020-08-24 2020-12-01 湖北武洲新材料科技有限公司 Low-temperature fast-curing environment-friendly insulating coating for non-oriented electrical steel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101209440A (en) * 2006-12-27 2008-07-02 鞍钢股份有限公司 Coating method of cold-rolled silicon steel chromium-free insulating coatings, coating rubber roll and coating liquid
CN103436070A (en) * 2013-09-09 2013-12-11 湖北武洲表面处理材料有限公司 Non-oriented silicon steel with insulating coating containing organic coloring agent and preparation method thereof
CN107245646A (en) * 2017-06-01 2017-10-13 东北大学 A kind of preparation method of the circumferential high-magnetic induction, low-iron loss non-orientation silicon steel of plate face
CN109836937A (en) * 2019-02-27 2019-06-04 武汉圆融科技有限责任公司 A kind of chrome-free insulating masking liquid and preparation method thereof and orientation free silicon steel plate
CN110885571A (en) * 2019-09-30 2020-03-17 武汉钢铁有限公司 Energy-saving non-oriented silicon steel coating liquid and preparation method and application thereof
CN112011250A (en) * 2020-08-24 2020-12-01 湖北武洲新材料科技有限公司 Low-temperature fast-curing environment-friendly insulating coating for non-oriented electrical steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116099741A (en) * 2021-11-09 2023-05-12 北京科益虹源光电技术有限公司 Insulating coating method and equipment for nanocrystalline magnetic core strip

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