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 PDFInfo
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- B05D3/00—Pretreatment 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
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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
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.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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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