CN107254201A - It is a kind of to improve the insulating coating solution and application method of orientation silicon steel sheet resistance - Google Patents
It is a kind of to improve the insulating coating solution and application method of orientation silicon steel sheet resistance Download PDFInfo
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- CN107254201A CN107254201A CN201710464392.0A CN201710464392A CN107254201A CN 107254201 A CN107254201 A CN 107254201A CN 201710464392 A CN201710464392 A CN 201710464392A CN 107254201 A CN107254201 A CN 107254201A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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Abstract
A kind of to improve the insulating coating solution of orientation silicon steel sheet resistance, its component and weight percent content are：Phosphate：25 ~ 45%, Ludox：25 ~ 45 %, chromate：6 ~ 20 %, borate：2 ~ 10 %, hydroxide：1 ~ 5%, separately add pure water according to 5 ~ 40 % of said components gross weight.Processing step：By phosphate, Ludox, chromate, borate, hydroxide and pure water are stirred to painting liquid；To the steel band stress relief annealing after coated.The component and its application method for the masking liquid that the present invention is used due to the present invention are different from prior art, therefore the oriented silicon steel of production, not only make the excellent surface quality of steel plate, decay resistance is good, and can be the resistance of surface of steel plate and bring up to and be not less than 80 Ω cm2, even as high as close to 260 Ω cm2, fully met the use demand of higher performance transformer core.
Description
Technical field
The present invention relates to a kind of insulating coating solution and application method, particularly belong to a kind of insulation for orientation silicon steel surface and apply
Liquid and application method, definitely for the insulating coating solution and application method of orientation silicon steel sheet resistance can be improved.
Background technology
Orientation silicon steel is largely used to as magnetive cord material, in order to reduce energy loss, it is desirable to which iron loss is small.In order to reduce
Iron loss, it is an effective method to assign tension force to steel plate.Therefore, it is smaller than steel plate by thermal coefficient of expansion by being formed at high temperature
Material constitute epithelium come to steel plate assign tension force, reach reduction iron loss purpose.
At present, the formation of the epithelium of directional silicon steel, be after generating forsterite system epithelium in finished products process,
Re-form the insulating coating based on phosphate.This insulating coating main component based on phosphate is gluey
SiO2, aluminium dihydrogen phosphate and chromic anhydride.
In the technology of existing production orientation silicon steel, orientation silicon steel needs progress destressing to move back after coating insulating coating solution
Fire, temperature is up to more than 900 DEG C.Because the tension force between coating and steel plate, and coating are acted on the respective thermal stress of steel plate,
During stress relief annealing, the coating of surface of steel plate easily produces microfissure, causes surface quality poor, and have impact on steel plate
Insulating properties and corrosion resistance.Those skilled in the art take measures from different perspectives in order to solve this problem
Solved, e.g., the document through retrieval：
Chinese Patent Application No. is CN201210001296.X document, discloses the insulation that a kind of orientation silicon steel belt surface is applied
Coating, its formula includes：1 part of chromic anhybride, 5.5 ~ 6.5 parts of water, 11.5 ~ 12.5 parts of aluminium dihydrogen phosphate and Ludox 13.5 ~
14.5 parts.The interface resistance of document orientation silicon steel increases to 35 ~ 50 Ω cm2Between, with good corrosion-resistant effect.
But its interface resistance is all in 35 ~ 50 Ω cm2Between, it can not meet the use need of higher performance transformer core
Ask.High-performance variable depressor is primarily used on main transformer circuit, voltage class 220kv, and iron core requires that insulaion resistance is more than 70
Ω•cm2, iron loss is low, and transformer service life is longer.
Chinese Patent Application No. is CN200910046440.X. document, and the orientation silicon steel for disclosing a kind of anti-adhesion sheets is used
Insulating coating solution and its coated technique.The masking liquid of the document contains：100 parts by weight of phosphoric acid dihydric salts, 1.4-4 parts by weight are soluble
Molybdate and/or tungstates, 15-30 parts by weight chromic anhybrides, 50-120 parts by weight Ludox or Alumina gel.The insulation of the document
Although coating can apply suitable tension force to directional silicon steel, high-insulativity is provided and reduce anneal 1 at 600-950 DEG C-
Cohesive phenomenon occurs under 3 hs, but it is mainly the anti-adhesion sheets for improving steel plate, and steel plate insulating properties is improved very
Limited, resistance is only capable of reaching 30-50 Ω cm2。
Chinese patent notification number be CN1039915C. document, it discloses a kind of insulating coating of orientation silicon steel into
Shape coating agent, its composition includes：In the colloid substance mixture of 100 parts by weight, 130-250 parts by weight of addition one kind or two
Anhydrous chromic acid, chromate or bichromate group are selected from more than kind, described colloid substance mixture is by 50-98 %（Weight）Grain
Footpath is the colloidal silicon dioxides that are represented with solid-state weight of 50 below nm, and 2-50% one or two or more kinds be selected from by Fe,
The oxide of the element selected in Ca, Ba, Zn, Al, Ni, Sn, Cu, Cr, Cd, Nd, Mn, Mo, Si, Ti, W, Bi, Sr, V group,
Carbide, chloride, sulfide, boride, hydroxide, silicate, carbonate, borate, sulfate, nitrate, chlorination
The colloid substance that thing and its particle diameter are 80-3000 nm is constituted.The insulating coating is conducive to improving the surface smoothness of steel plate,
And then being conducive to iron core processing characteristics of the steel plate in transformer manufacturing, insulating properties and corrosion resistance to steel plate substantially do not change
Kind, resistance is only capable of reaching 30-50 Ω cm2。
Chinese patent notification number is CN1198963C document, discloses the film covering characteristics such as a kind of cohesive and corrosion resistance good
Good, duty factor is good, and keeps assigning the oriented electrical steel of the big insulating coating of tension force.The surface of steel plate of the document has
The hydrophosphate and silica of divalence or trivalent metal are that the first layer and aluminium borate of main component are the second of main component
The insulating coating that layer is constituted.Apply after first layer masking liquid, baking is dried at 200 ~ 600 DEG C, then apply second layer masking liquid,
800 ~ 1200 DEG C are dried baking.The document has that coated technique is more complicated, the higher deficiency of production cost, is also unfavorable for existing
There is the realization on line of production technology.Resistance is only capable of reaching 50 Ω cm2。
The content of the invention
It is an object of the invention to overcome deficiency present in above-mentioned document there is provided a kind of not only to make the surface quality of steel plate
Excellent, decay resistance is good, and can be the resistance of surface of steel plate and bring up to and be not less than 80 Ω cm2Can improve oriented silicon
The insulating coating solution and application method of steel surface resistance.
Realize the measure of above-mentioned purpose：
A kind of to improve the insulating coating solution of orientation silicon steel sheet resistance, its component and weight percent content are：Phosphate：25 ~
45%, Ludox：25 ~ 45 %, chromate：6 ~ 20 %, borate：2 ~ 10 %, hydroxide：1 ~ 5%, separately according to upper
5 ~ 40 % for stating component weight add pure water.
Further：The phosphate for Mg, Al, Ni, Mn inorganic compound in it is one or two or more kinds of with appoint
The mixture of meaning ratio mixing.
Further：The Ludox is the nm of granularity 5-20 gluey SiO2。
Further：The borate for Mg, Al, Li, Fe inorganic compound in it is one or two or more kinds of with appoint
The mixture of meaning ratio mixing.
Further：The hydroxide is one in the nm of granularity 6 ~ 15 inorganic oxyhydroxide of Fe, Mg, Ni, Na
Kind or more than two kinds of the mixture mixed with arbitrary proportion.
A kind of application method for the insulating coating solution that can improve orientation silicon steel sheet resistance, its step：
1）By phosphate：25 ~ 45%, Ludox：25 ~ 45 %, chromate：6 ~ 20 %, borate：2 ~ 10 %, hydrogen-oxygen
Compound：1 ~ 5% and 5 ~ 40 % pure water are stirred to liquid is applied, and control mixing time is in 2 ~ 4 hours；
2）It is coated, control masking liquid temperature is at 30 ~ 45 DEG C；Coating amount is controlled in 5.5-10 g/m2；
3）Stress relief annealing is carried out to the steel band after coated, annealing temperature is not less than 900 DEG C, and annealing time is at 1.5-3 points
Clock.
Further：Masking liquid temperature is heated by steam and kept.
Further：Step 1）Middle mixing speed is in 100-300 r/min.
The mechanism and effect of each component and main technique in the present invention
Phosphate：In the present invention, because the free phosphoric acid in phosphate is more stable, and crystal volume during heating in solution is swollen
It is swollen smaller, therefore form fine and close dielectric film and microfissure will not be produced.But if its content is then also easy to produce as being less than 25%
Microfissure；Such as it is higher than 45%, then coating tension force is small, is unfavorable for the improvement of steel plate magnetic property.
The phosphate for making not can select Ca in the present invention of explanation is needed, because it easily forms spherulite, heating
When Volume Changes it is big, film is also easy to produce the defects such as micro-crack, reduces insulating properties and corrosion resistance.
Ludox：The little particle glue SiO that granularity is 5-20 nm why is selected in the present invention2, it is due to that it has
It is porous to prevent from being formed beneficial to fine and close dielectric film, the good corrosion resistance for being, and controllable phosphatic degree of crystallization is formed
The dielectric film of loose shape structure.If its granularity is less than 5nm, gelatin phenomenon easily occurs for masking liquid；If its granularity is more than 20nm,
Then coating surface is coarse, is also easy to produce microfissure；Its content is as being less than 25%, then coating luminous degree is low, rough surface；Such as it is higher than
45%, then it is unfavorable for providing tension force for steel plate, it is impossible to improve steel plate magnetic.
Adjust glue SiO2Siloxane structure, make solution more stable and effectively filling phosphate open structure and with
Free phosphorus is combined, and makes phosphate solution also more stable.Be conducive to improving the insulating properties and corrosion resistance of dielectric film.
Chromate：Because Cr can be captured from by P, and Cr makes dielectric film more firm with Si, O and p-shaped into chemical combination key, intact
Fall into, good corrosion resistance.Properly increase insulating properties and corrosion resistance that ratio of the chromate in masking liquid is conducive to improving dielectric film.
But when it is less than 6%, then coating corrosion resistance is poor；Such as be higher than 20%, then can coating corrosivity it is strong, give coating liquid waste processing band
To bother, environmental pollution is big.
Borate：To be one kind or two or more in Mg, Al, Li, Fe inorganic compound.Masking liquid decomposites what is come when sintering
The metallic elements such as B form stable phosphate cpd with free phosphoric acid, make dielectric film more firm, insulating properties and good corrosion resistance.
But when it is less than 2%, then coating insulation is reduced；Such as be higher than 10%, then can coating surface be also easy to produce microfissure.
Hydroxide：In the present invention, Fe, Mg, Ni, Na that its granularity is 6-15 nm ultra-fine grains why are selected
It is one kind or two or more in inorganic oxyhydroxide, it is due to that after hydroxide and borate combination, can prevent from applying lyogel, and
Be conducive to improving the corrosion resistance of coating.But when it is less than 1%, then it improves the declines for applying lyogel, it is unfavorable for masking liquid painting
Apply；Such as it is higher than 5%, then coating surface is also easy to produce microfissure.
Why the present invention controls above-mentioned masking liquid in coating process, and masking liquid need to be heated using steam, and controls
Masking liquid temperature is due to that its coating temperature is less than 30 DEG C, then is unfavorable for the diffusivity of masking liquid, such as temperature is higher than at 30 ~ -45 DEG C
45 DEG C, then masking liquid be also easy to produce bubble, influence the coating effect of masking liquid.
Why the present invention is by step 1）In mixing speed be limited to 200 ~ 600 r/min, be due to as stirring speed
Degree is less than 200 r/min, is unfavorable for the diffusivity of masking liquid, it is impossible to ensure the uniformity of coating；As mixing speed is higher than 600 r/
Min, then can make masking liquid be also easy to produce bubble, so as to influence the coating effect of masking liquid；So control speed of agitator is 200 ~ 600
r/min.So that coating amount is in 5.5-10 g/m2。
Compared with prior art, the component of masking liquid and its application method used due to the present invention is different from existing the present invention
Technology, therefore the oriented silicon steel of production, not only make the excellent surface quality of steel plate, and decay resistance is good, and can be steel
The resistance of plate surface, which is brought up to, is not less than 80 Ω cm2, even as high as close to 260 Ω cm2, fully met higher performance transformation
The use demand of device iron core.
Embodiment
The present invention is described in detail below：
Table 1 is the component comparative example of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example；
Table 3 is various embodiments of the present invention and comparative example performance text list
Various embodiments of the present invention are used according to following steps：
1）By phosphate：25 ~ 45%, Ludox：25 ~ 45 %, chromate：6 ~ 20 %, borate：2 ~ 10 %, hydrogen-oxygen
Compound：1 ~ 5% and 5 ~ 40 % pure water are stirred to liquid is applied, and control mixing time is in 2 ~ 4 hours；
2）It is coated, control masking liquid temperature is at 30 ~ 45 DEG C；Coating amount is controlled in 5.5-10 g/m2；
3）Stress relief annealing is carried out to the steel band after coated, annealing temperature is not less than 900 DEG C, and annealing time is at 1.5-3 points
Clock.
Prompting：
The various embodiments of the present invention of table 1 and comparative example chemical composition comparative example（wt%）
Note：It should be noted that the granularity of Ludox and hydroxide is in respective limited range.
The various embodiments of the present invention of table 2 and comparative example main technologic parameters list
Table 3 is various embodiments of the present invention and comparative example mechanics properties testing situation list
Corrosion resistance test condition：In neutral salt spray after 8 hours, its red rust corrosion occupied area %）.
From table 3 it can be seen that after the masking liquid prepared by the present invention is coated on steel plate, plate surface quality is excellent, layer
Between resistance generally be more than 80 Ω cm2, excellent corrosion resistance, after 8 hours salt mist experiments, surface corrosion area is less than 2 %.
Above-described embodiment is only most preferably to enumerate, and is not the restriction to embodiments of the present invention.
Claims (8)
1. a kind of can improve the insulating coating solution of orientation silicon steel sheet resistance, its component and weight percent content are：Phosphate：25
~ 45%, Ludox：25 ~ 45 %, chromate：6 ~ 20 %, borate：2 ~ 10 %, hydroxide：1 ~ 5%, separately according to
5 ~ 40 % of said components gross weight add pure water.
2. a kind of as claimed in claim 1 can improve the insulating coating solution of orientation silicon steel sheet resistance, it is characterised in that：It is described
Phosphate is one or two or more kinds of mixing mixed with arbitrary proportion in Mg, Al, Ni, Mn inorganic compound
Thing.
3. a kind of as claimed in claim 1 can improve the insulating coating solution of orientation silicon steel sheet resistance, it is characterised in that：The silicon
Colloidal sol is the nm of granularity 5-20 gluey SiO2。
4. a kind of as claimed in claim 1 can improve the insulating coating solution of orientation silicon steel sheet resistance, it is characterised in that：The boron
Hydrochlorate is one or two or more kinds of mixtures mixed with arbitrary proportion in Mg, Al, Li, Fe inorganic compound.
5. a kind of as claimed in claim 1 can improve the insulating coating solution of orientation silicon steel sheet resistance, it is characterised in that：The hydrogen
Oxide is one or two or more kinds of with arbitrary proportion in the nm of granularity 6 ~ 15 inorganic oxyhydroxide of Fe, Mg, Ni, Na
The mixture of mixing.
6. a kind of application method for the insulating coating solution that can improve orientation silicon steel sheet resistance as claimed in claim 1, its step：
1）By phosphate：25 ~ 45%, Ludox：25 ~ 45 %, chromate：6 ~ 20 %, borate：2 ~ 10 %, hydrogen-oxygen
Compound：1 ~ 5% and 5 ~ 40 % pure water are stirred to liquid is applied, and control mixing time is in 2 ~ 4 hours；
2）It is coated, control masking liquid temperature is at 30 ~ 45 DEG C；Coating amount is controlled in 5.5-10 g/m2；
3）Stress relief annealing is carried out to the steel band after coated, annealing temperature is not less than 900 DEG C, and annealing time is at 1.5-3 points
Clock.
7. a kind of application method for the insulating coating solution that can improve orientation silicon steel sheet resistance as claimed in claim 6, its feature
It is：Masking liquid temperature is heated by steam and kept.
8. a kind of application method for the insulating coating solution that can improve orientation silicon steel sheet resistance as claimed in claim 6, its feature
It is：Step 1）Middle mixing speed is in 100-300 r/min.
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| CN201710464392.0A CN107254201A (en) | 2017-06-19 | 2017-06-19 | It is a kind of to improve the insulating coating solution and application method of orientation silicon steel sheet resistance |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110283488A (en) * | 2019-06-28 | 2019-09-27 | 武汉钢铁有限公司 | Superelevation magnetic induction grain-oriented silicon steel half organic insulation coating and its application method |
| CN110283480A (en) * | 2019-06-27 | 2019-09-27 | 武汉钢铁有限公司 | For the half organic-semi-inorganic silicon-steel sheet masking liquid and preparation method of welding and application |
| CN111961359A (en) * | 2020-08-28 | 2020-11-20 | 武汉钢铁有限公司 | Insulating coating liquid for improving magnetism of oriented silicon steel and preparation method and application method thereof |
| CN112239863A (en) * | 2020-09-11 | 2021-01-19 | 武汉圆融科技有限责任公司 | Insulating coating liquid for improving oriented silicon steel surface coating cracks, preparation method thereof and oriented silicon steel plate |
| CN113248947A (en) * | 2021-05-21 | 2021-08-13 | 武汉科技大学 | Chromium-free inorganic insulating paint capable of modifying surface of oriented silicon steel and preparation method thereof |
| CN113278311A (en) * | 2021-05-28 | 2021-08-20 | 武汉科技大学 | Chromium-free inorganic insulating coating for oriented silicon steel and preparation method thereof |
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| CN102558923A (en) * | 2012-01-04 | 2012-07-11 | 无锡华精新型材料有限公司 | Insulation coating coated on surface of oriented silicon steel strip |
| CN103709796A (en) * | 2013-12-12 | 2014-04-09 | 武汉钢铁(集团)公司 | Chromium-free stress coating capable of improving surface tension of oriented silicon steel, and preparation method thereof |
| CN104530782A (en) * | 2015-01-15 | 2015-04-22 | 上海迪升防腐新材料科技有限公司 | Phosphate coating solution and preparation method thereof |
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| CN1048554A (en) * | 1989-07-05 | 1991-01-16 | 新日本制铁株式会社 | The grain-oriented magnetic steel sheet and the insulating coating method of forming thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110283480A (en) * | 2019-06-27 | 2019-09-27 | 武汉钢铁有限公司 | For the half organic-semi-inorganic silicon-steel sheet masking liquid and preparation method of welding and application |
| CN110283488A (en) * | 2019-06-28 | 2019-09-27 | 武汉钢铁有限公司 | Superelevation magnetic induction grain-oriented silicon steel half organic insulation coating and its application method |
| CN110283488B (en) * | 2019-06-28 | 2021-07-06 | 武汉钢铁有限公司 | Semi-organic insulating coating for ultrahigh magnetic induction oriented silicon steel and use method thereof |
| CN111961359A (en) * | 2020-08-28 | 2020-11-20 | 武汉钢铁有限公司 | Insulating coating liquid for improving magnetism of oriented silicon steel and preparation method and application method thereof |
| CN112239863A (en) * | 2020-09-11 | 2021-01-19 | 武汉圆融科技有限责任公司 | Insulating coating liquid for improving oriented silicon steel surface coating cracks, preparation method thereof and oriented silicon steel plate |
| CN112239863B (en) * | 2020-09-11 | 2023-05-16 | 武汉科技大学 | Insulating coating liquid for improving cracks of surface coating of oriented silicon steel, preparation method of insulating coating liquid and oriented silicon steel plate |
| CN113248947A (en) * | 2021-05-21 | 2021-08-13 | 武汉科技大学 | Chromium-free inorganic insulating paint capable of modifying surface of oriented silicon steel and preparation method thereof |
| CN113278311A (en) * | 2021-05-28 | 2021-08-20 | 武汉科技大学 | Chromium-free inorganic insulating coating for oriented silicon steel and preparation method thereof |
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