CN101029196A - Electrical steel thermal-insulating coating with excellent adhesion - Google Patents
Electrical steel thermal-insulating coating with excellent adhesion Download PDFInfo
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- CN101029196A CN101029196A CN 200610024190 CN200610024190A CN101029196A CN 101029196 A CN101029196 A CN 101029196A CN 200610024190 CN200610024190 CN 200610024190 CN 200610024190 A CN200610024190 A CN 200610024190A CN 101029196 A CN101029196 A CN 101029196A
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- resin
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- electrical steel
- dichromate
- excellent adhesion
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Abstract
An electrical sheet surface insulating coating consists of dibasic-metal bichromate 34-60wt%, resin emulsion 7-15wt%, organic reducer 1-3wt% and boric acid 30-55wt%. The resin is acetic ether or acrylic acid resin, organic reducer is ethanediol or propanetriol; dibasic-metal bichromate: resin=100: (15-25), the density of coating liquid is controlled between 1.00-1.20g/m2. It has excellent adhesion.
Description
Technical field: the present invention relates to a kind of electrical steel topcoating that is used for, particularly a kind of electric steel insulating paint with good adhesion.
Background technology: the tack of electrical steel surface insulation coating and the tack after the stress relieving are the most important and the most basic performance index of electric steel insulating coating.
Tack is meant the bonding force and the combination degree of film and substrate.Form under the constant situation in coating, a lot of uncomfortable conditions such as blocked up, the dry storing temperature of thickness is too high or too low all can make tack descend, when the tack difference is carried out slitting itemize or continuous punching to electrical steel, because the tension force that gives steel band can make the coating shedding of limit portion, after gathering, these films that come off to abrade other position again, cause the punching press fault of high velocity ram machine, and cause insulativity and corrosion proof deterioration, lost all effects of coating itself, so-called insulating coating is also just meaningless.
Improve electrical steel finished product tack and be always manufacturer's unremitting effort, perfect direction, the very poor product of tack usually appears in especially thick specification and thick coating, causes sealing the waste of volume degradation processing and resource and product.The user is with cold rolling electric itemize and punching continuously, in each punching, all can produce certain stress, this stress directly has influence on the magnetic and the iron loss of iron core, need carry out stress relieving and eliminate, to make the surface of steel plate chap produce inhomogeneous oxidation membranaceous for the relatively poor electrical steel sector-meeting of finished product tack in this process.
Chinese patent 03116096.4 provides a kind of electrical steel coating, and coating contains the dichromate of at least a kind of divalent metal, and the consumption of this dichromate is with CrO
3Measure, account for 31～74% of whole composition weights; With the vinyl acetate between to for plastic/tertiary ethylene carbonate copolymer resins or the acrylate resin of allyloxy hydroxypropyl azochlorosulfonate acid sodium modification by copolymerization, resin solid accounts for 2.4～48% of whole composition weights; And organic reducing agent, account for 3.6～32.4% of whole composition weights; And boric acid accounts for 6.7～28% of whole composition weights.This invention has good adhesion, insulativity, and solidity to corrosion and punching, but its tack still remains to be improved.
Summary of the invention: the purpose of this invention is to provide a kind of electric steel insulating paint of tack excellence, mainly solve the existing not good enough technical problem of its tack of coating.Technical scheme of the present invention is: a kind of electric steel insulating paint with good adhesion, the weight percent of its moiety is: the dichromate 34～60% of divalent metal, resin emulsion 7～15%, organic reducing agent 1～3%, boric acid 30～55%.Wherein resin is vinyl acetate resin or acrylic resin, and organic reducing agent is ethylene glycol or glycerol, the dichromate of divalent metal: resin=100: (15～25), the density that finally is coated with feed liquid is controlled at 1.00～1.20g/m
2Final be coated with feed liquid at the electrical sheet face at the plate face continuously evenly after the coating, rapid heating is solidified in 200～600 ℃ stove, can form the good insulation performance film.The dichromate of use of the present invention is identical with Chinese patent 03116096.4.
The invention has the beneficial effects as follows: whether the dichromate of host divalent metal and the proportioning of resin and masking liquid reaction fully have very significantly relation, if the host amount is big, then host can not fully be reduced, the residual deleterious sexavalent chrome of meeting in the coating, and coating has confused phenomenon; If amount of resin is excessive, at coatingsurface tangible skewness appears then, and stain appears in serious meeting.The control of density mainly is the homogeneity that applies, and density is on the low side, then can not obtain the target dry film thickness, and the coating ununiformity can occur; Density is higher, and then organic composition is separated out easily in the masking liquid, forms suspended substance.Whether temperature control is fully influential to coating reaction, and temperature is on the low side, then reacts insufficient, the residual deleterious sexavalent chrome of meeting in the coating; Temperature drift, organic compositions such as the resin of coating can become charcoal, the coatingsurface blackout.The density and the drying temperature of the dichromate by controlling the proportioning of each component, especially divalent metal and the ratio of resin, final masking liquid can obtain the insulating film of adhesion property excellence.
Embodiment: embodiment and comparative example see Table 1
| Example | Dichromate (%) | Resin (%) | Dichromate: resin | Reductive agent (%) | Boric acid (%) | Tack (the disbonding area after φ 10 bendings is judged) |
| The present invention | 34～60 | 7～15 | 100∶ (15～25) | 1～3 | 30～55 | |
| Embodiment 1 | 45.6 | 9.7 | 100∶21 | 1.7 | 43 | 1 grade |
| Embodiment 2 | 38 | 8 | 100∶21 | 2 | 52 | 1 grade |
| Embodiment 3 | 55 | 12 | 100∶22 | 2.2 | 30.8 | 1 grade |
| Comparative example 1 | 30 | 15 | 100∶50 | 3 | 52 | 3 grades |
| Comparative example 2 | 62 | 6 | 100∶10 | 2 | 30 | 5 grades |
| Comparative example 3 | 50 | 14 | 100∶28 | 2 | 34 | 3 grades |
In the table 1, resin is a vinyl acetate resin among the embodiment 1, and reductive agent is an ethylene glycol; Resin is an acrylic resin among the embodiment 2, and reductive agent is a glycerol; Embodiment 3 resins are vinyl acetate resin, and reductive agent is a glycerol.The evaluation criteria of coating sees Table 2: table 2 coating tack evaluation criteria (φ 10mm)
| Rank | Coating stripping area occupation ratio (%) |
| 1 | 0 |
| 3 | 0～30 |
| 5 | ＞30～70 |
| 7 | ＞70 |
Originally declare grade standard and adopt Baosteel company standard, BQB480-2003
Claims (3)
1, a kind of electric steel insulating paint with good adhesion, the weight percent of its moiety is: the dichromate 34～60% of divalent metal, resin emulsion 7～15%, organic reducing agent 1～3%, boric acid 30～55%, wherein resin is vinyl acetate resin or acrylic resin, and organic reducing agent is ethylene glycol or glycerol.
2, the electric steel insulating paint with good adhesion according to claim 1 is characterized in that the dichromate of divalent metal: resin=100: (15～25).
3, the electric steel insulating paint with good adhesion according to claim 1, the density that it is characterized in that finally being coated with feed liquid is 1.00～1.20g/m
2
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610024190 CN101029196A (en) | 2006-02-28 | 2006-02-28 | Electrical steel thermal-insulating coating with excellent adhesion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610024190 CN101029196A (en) | 2006-02-28 | 2006-02-28 | Electrical steel thermal-insulating coating with excellent adhesion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101029196A true CN101029196A (en) | 2007-09-05 |
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| CN 200610024190 Pending CN101029196A (en) | 2006-02-28 | 2006-02-28 | Electrical steel thermal-insulating coating with excellent adhesion |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102964951A (en) * | 2012-11-29 | 2013-03-13 | 常德市武陵金德镭射科技有限公司 | Coating material and preparation method thereof |
| CN103275603A (en) * | 2013-01-17 | 2013-09-04 | 段辉 | High insulation aqueous paint for electrical steel and preparation method thereof |
| WO2018119979A1 (en) * | 2016-12-30 | 2018-07-05 | 黄响华 | Insulating coating for electrical steel surfaces |
| CN109504202A (en) * | 2018-11-06 | 2019-03-22 | 武汉钢铁有限公司 | Chromate with good secondary coating adhesion-allyl resin masking liquid and the preparation method and application thereof |
-
2006
- 2006-02-28 CN CN 200610024190 patent/CN101029196A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102964951A (en) * | 2012-11-29 | 2013-03-13 | 常德市武陵金德镭射科技有限公司 | Coating material and preparation method thereof |
| CN102964951B (en) * | 2012-11-29 | 2016-11-23 | 常德市武陵金德镭射科技有限公司 | A kind of coating material and preparation method thereof |
| CN103275603A (en) * | 2013-01-17 | 2013-09-04 | 段辉 | High insulation aqueous paint for electrical steel and preparation method thereof |
| WO2018119979A1 (en) * | 2016-12-30 | 2018-07-05 | 黄响华 | Insulating coating for electrical steel surfaces |
| CN109504202A (en) * | 2018-11-06 | 2019-03-22 | 武汉钢铁有限公司 | Chromate with good secondary coating adhesion-allyl resin masking liquid and the preparation method and application thereof |
| CN109504202B (en) * | 2018-11-06 | 2021-03-05 | 武汉钢铁有限公司 | Chromate-propylene resin coating liquid with good secondary coating adhesion and preparation method and application thereof |
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Open date: 20070905 |