EP0298277A1 - Verfahren zur Erzeugung elektrisch isolierender Überzüge auf Metalloberflächen - Google Patents

Verfahren zur Erzeugung elektrisch isolierender Überzüge auf Metalloberflächen Download PDF

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Publication number
EP0298277A1
EP0298277A1 EP88109337A EP88109337A EP0298277A1 EP 0298277 A1 EP0298277 A1 EP 0298277A1 EP 88109337 A EP88109337 A EP 88109337A EP 88109337 A EP88109337 A EP 88109337A EP 0298277 A1 EP0298277 A1 EP 0298277A1
Authority
EP
European Patent Office
Prior art keywords
parts
weight
metal surface
aqueous preparation
synthetic resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP88109337A
Other languages
German (de)
English (en)
French (fr)
Inventor
Heribert Domes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thyssen AG
Stahlwerke Bochum AG
Original Assignee
Stahlwerke Bochum AG
August Thyssen Huette AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stahlwerke Bochum AG, August Thyssen Huette AG filed Critical Stahlwerke Bochum AG
Publication of EP0298277A1 publication Critical patent/EP0298277A1/de
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes

Definitions

  • the invention relates to a method for producing electrically insulating coatings on metal surfaces and its application to the production of electrically insulating coatings on metal surfaces made of silicon-containing steel.
  • Such insulating layers can be inorganic and organic in nature and can be formed, for example, by means of treatment liquids containing chromic acid and / or phosphoric acid or phosphate. Although their insulating effect is mostly of satisfactory quality, the wear of the punching tools is generally comparatively high. Chromic acid is also undesirable in terms of workplace hygiene and environmental protection.
  • insulating coatings which are produced by applying treatment fluids based on organic resins, possibly with inorganic additives, often extends the tool life, but their adhesive strength after stress relief annealing and their influence on the formation of the weld seam are generally unsatisfactory.
  • Another type of insulating layer which is formed by applying treatment fluids based on organic resins with fluorides of polyvalent metals, in particular aluminum fluoride, is very limited in the insulation thickness with regard to its satisfactory weldability. Furthermore, it cannot be ruled out that combinations of organic resins with fluorides of polyvalent metals, by burning the insulation layer, as is common in the welding process, will release environmentally harmful substances (EP - A - 209 940).
  • the object of the invention is to provide a method for producing electrically insulating coatings on metal surfaces, in particular of silicon-containing steel, which does not have the disadvantages of the aforementioned methods of the prior art.
  • drying up means first of all evaporation of the solvent of the preparation and does not exclude that in parallel e.g. chemical reactions within the components or between the components of the preparation, e.g. Crosslinking curing reactions and the like, as well as between the components and the metal surface.
  • the method according to the invention is suitable for the treatment of surfaces of different metals. However, it is of particular importance for the production of coatings on iron and iron alloys, in particular those with silicon as an alloy component, and other substrates known as magnetic materials.
  • the material to be insulated is usually in the form of sheet metal in the form of a strip or sheet.
  • the method according to the invention can also be applied to workpieces of different shapes.
  • An essential component of the aqueous preparation to be used according to the method according to the invention is a synthetic resin which can be diluted with water.
  • Suitable resins are polyester, polyamide, epoxy, phenol, melamine resin and / or latices based on acrylic acid, maleic acid ester, styrene, butadiene, ethylene and / or vinyl acetate.
  • the dilutability with water is determined by the presence of neutralizable acid groups and / or by the In the presence of suitable emulsifiers.
  • An alkylphenol-modified polyester resin with an acid number of 90 to 110 and a molecular weight of 7,000 to 15,000 has proven particularly advantageous.
  • Polyethylene, polypropylene, polytetrafluoroethylene and / or polyamide can be used as the dispersed, waxy substance. Particularly favorable coating properties are achieved with micronized polyethylene wax.
  • the melting point of the wax is preferably selected so that at least part of the wax liquefies during the heating phase.
  • the wax component makes a significant contribution to the good punchability of sheet metal coated with the process according to the invention.
  • the task of the inorganic and / or organic pigment is to increase the electrical insulating properties and to improve the welding of punched-out laminated cores in such a way that a welding bead is placed over the cutting edges lying one on top of the other.
  • the welding speed can be increased in part up to over 1500 mm / min without pores and voids in the weld seam and annoying soot deposits on both sides of the weld seam.
  • the service life of the welding electrodes is extended considerably.
  • Silicates, talc, polymers formed from vinyl groups or substituted vinyl groups and / or copolymers of polyvinylidene chloride or methyl methacrylate with acrylonitrile are preferably used as pigments for the process according to the invention.
  • the particle size is between 0.1 and 50 ⁇ m, preferably between 2 and 15 microns.
  • Organic polymer pigments behave particularly advantageously and expand to particle sizes of 2 to 40 ⁇ m during heating.
  • the borate used in the preparation according to the invention can be introduced in the form of boric acid or its alkali salt.
  • the dimensioning is preferably such that 0.1 to 20 parts by weight of borate component, calculated as borax, account for 100 parts by weight of synthetic resin.
  • borate component calculated as borax
  • the borate content has a favorable influence on the adhesion of the coating after thermal loads in the range from 500 to 850 ° C.
  • alkanolamines e.g. Dimethylaminoethanol, and / or dimethylamine used.
  • the above-mentioned components are preferably present in the preparation according to the invention, based on 100 parts by weight of synthetic resin, in the following amounts: 0.1 to 40 parts by weight of dispersed waxy substance 1 to 60 parts by weight of inorganic and / or organic pigment 0.1 to 40 parts by weight of borate and 0.1 to 20 parts by weight of organic amine.
  • the aqueous preparation contains pyrogenic silica which preferably in amounts of 0.1 to 40 parts by weight, based on 100 parts by weight of synthetic resin. This component improves the coating properties after previous annealing operations and, on the other hand, enables the rheological behavior of the preparation and the moist film to be influenced.
  • surfactants are preferably used in it.
  • the dosing instructions 0.1 to 10, in particular 0.2 to 3 parts by weight of surfactant per 100 parts by weight of synthetic resin have proven to be favorable.
  • surface-active ethyne compounds e.g. tertiary Ethinglykol, used because they offer a favorable combination of wetting, dispersing and anti-foam properties.
  • defoamers e.g. in amounts of 0.1 to 10, preferably 0.2 to 4, parts by weight, based on 100 parts by weight of synthetic resin.
  • Aqueous treatment liquids often have the property of emulsifying air bubbles under the action of shear forces. This effect can be counteracted by the use of defoamers, preferably based on hydrocarbons, oxyethylated compounds and silicon-containing components.
  • the preparation according to the invention is usually used with a dry residue of 10 to 80% by weight, the rest water. You can apply it to the metal surface using all methods known from painting technology, e.g. Dipping, spraying, flooding, pouring, painting and rolling take place. When coating sheet metal in strip and sheet form, however, roller application is preferred.
  • the moist film is also heated in order to dry and form it in the facilities known from painting technology.
  • the layer thickness of the moist film of the treatment liquid applied to the belt and the resulting layer thickness of the insulation layer after drying depends in particular on the dry residue contained in the treatment liquid, the quantitative promotion of the treatment liquid by the roller combination of the coating chair, in particular on the contact pressure of the individual rollers against one another , the speed of rotation of the application roller in relation to the speed of the steel belts.
  • coating can take place at a belt speed of up to approximately 120 m / min and more.
  • the subsequent drying of the layer takes place at 120 to 350 ° C (object temperature), expediently in a continuous oven for 1 hour to 5 seconds.
  • object temperature expediently in a continuous oven for 1 hour to 5 seconds.
  • the longer time applies for low temperatures and the shorter time for higher temperatures.
  • a residence time in the oven of 20 seconds at 300 ° C applies.
  • the strips can be brought into contact with the treatment liquid mentioned on one side and / or on both sides with the aid of the aforementioned coating system.
  • the insulated tapes are further processed as broadband and / or split in the longitudinal direction with the aid of splitting systems.
  • the particularly good adhesive strength and the elasticity of the insulation layer resulting from the treatment liquid described are advantageous. Peeling off the insulating layer would damage the remaining insulated surface of the tapes.
  • the particularly good resistance of the insulation layer described to corrosion during storage in rooms with particularly high atmospheric humidity is advantageous.
  • the insulation layer gives the sheet excellent protection against corrosion.
  • the stamped parts are stacked and often welded to their sides. It is particularly advantageous here that this welding process, due to the special composition of the insulation layer, enables a welding speed of more than 1500 mm / min without pores and / or void formation.
  • the method according to the invention offers, inter alia - Excellent insulation of the metal surfaces against the passage of electrical currents - good punchability of the insulated sheets - reduced wear of the punching tools - good adhesion of the coatings during and after mechanical stress - Excellent weldability of the stamped sections provided with the coating and stacked - Excellent adhesion of the coatings remaining after a temperature stress between 500 and 850 ° C - absence of toxic components.
  • a particular advantage of the invention is that an excellent electrical surface resistance of the sheets is achieved even with very small layer thicknesses.
  • the preferred method of working with freedom of the treatment liquid from chromium compounds, in particular from chromate compounds, and organic solvents also has the advantage that environmental damage is avoided and special precautionary measures during strip treatment can be dispensed with.
  • This preparation was applied to the surface of a Si-alloyed electrical steel sheet with a nominal thickness of 0.5 mm (grade V 700-50 A according to DIN 46400 Part 1) using a rubber roller on both sides. To dry the coating, the coated sheets were then treated at a temperature of 300 ° C. over a period of 20 seconds. The average dry layer thickness was 1 ⁇ m ⁇ 0.5 ⁇ m.
  • the quality of the insulation layer produced is shown in the table below.
  • Example 2 The same treatment liquid as in Example 1 was brought into contact with an Si-alloyed electrical steel sheet. Processing was also carried out under the conditions of Example 1.
  • the average dry film thickness was 4 ⁇ m ⁇ 0.5 ⁇ m.
  • the quality of the insulation layer produced is shown in the table below.
  • an alkylphenol-modified polyester resin (as in Example 1) were mixed with 25 parts by weight of an acrylic resin, 30 parts by weight of a partially hydroxymethylated melamine resin, 8 parts by weight of a micronized polyethylene wax, 12.0 parts by weight.
  • Parts copolymer of methyl methacrylate / acrylonitrile in spherical form average particle diameter 10 microns
  • 7.0 parts by weight of sodium borate calculated as Na2B4O7.10H2O
  • 8.0 parts by weight of an alkanolamine 6.5 parts by weight of pyrogenic Silicic acid
  • 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of ethinglycol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight of deionized water a mixture of substances with surface-active properties, consisting of ethinglycol, hydrocarbons, oxyethylated compounds and silicon-containing components.
  • the average dry film thickness was 1.0 ⁇ m ⁇ 0.5 ⁇ m.
  • the quality of the insulation layer produced is shown in the table below.
  • a layered silicate (average particle diameter 10 ⁇ m), 7.0 parts by weight of sodium borate (calculated as Na2B4O7.10H2O), 8.0 parts by weight of an alkanolamine, 6.5 parts by weight of pyrogenic silica, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of ethinglycol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight of fully deionized water.
  • the average dry film thickness was 1.0 ⁇ m ⁇ 0.5 ⁇ m.
  • the quality of the insulation layer produced is shown in the table below.
  • an alkylphenol-modified polyester resin (as in Example 1) were mixed with 8 Parts by weight of a micronized polyethylene wax, 12.0 parts by weight of a copolymer of methyl methacrylate / acrylonitrile in spherical form (average particle diameter 12 microns), 20 parts by weight of aluminum fluoride (calculated as AlF3.3H2O), 7 parts by weight of sodium borate (calculated as Na2B4O7 10H2O, 14 parts by weight of dimethylethanolamine and 115 parts by weight of demineralized water mixed.
  • AlF3.3H2O aluminum fluoride
  • sodium borate (calculated as Na2B4O7 10H2O, 14 parts by weight of dimethylethanolamine and 115 parts by weight of demineralized water mixed.
  • the average dry film thickness was 1.0 ⁇ m ⁇ 0.5 ⁇ m.
  • the quality of the insulation layer produced is shown in the table below.
  • an alkylphenol-modified polyester resin 100 parts by weight of an alkylphenol-modified polyester resin (as in Example 1) were mixed with 8.0 parts by weight of a micronized polyethylene wax, 7.0 parts by weight of sodium borate (calculated as Na2B4O7.10H2O), 8.0 parts by weight.
  • a micronized polyethylene wax 7.0 parts by weight of sodium borate (calculated as Na2B4O7.10H2O)
  • 8.0 parts by weight - Part of an alkanolamine, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of Ethinglykol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight of demineralized water.
  • the average dry film thickness was 1.0 ⁇ m ⁇ 0.5 ⁇ m.
  • the quality of the insulation layer produced is shown in the table below.
  • an alkylphenol-modified polyester resin 100 parts by weight of an alkylphenol-modified polyester resin (as in Example 1) were with 8.0 parts by weight of a micronized polyethylene wax, 20 parts by weight of aluminum fluoride (calculated as AlF3.3H2O), 7.0 parts by weight Sodium borate (calculated as Na2B4O7.10H2O), 15 parts by weight of an alkanolamine, 2.5 parts by weight of a mixture of substances with surface-active properties, consisting of ether glycol, hydrocarbons, oxyethylated compounds and silicon-containing components, and 170 parts by weight demineralized water mixed.
  • the average dry film thickness was 1.0 ⁇ m ⁇ 0.5 ⁇ m.
  • the quality of the insulation layer produced is shown in the table below.
  • Line 2 shows the stability of the treatment liquid after a storage period under normal conditions of more than 4 weeks.
  • the homogeneity of the treatment liquid was assessed visually.
  • the viscosity was determined according to DIN 53211, 4 mm B immediately after production. This value was compared with the value measured after a storage period of the treatment liquid of more than 4 weeks.
  • Line 3 specifies the dry layer thickness of the insulation layers resulting from the treatment liquids, under which the test results were determined. It is an average of 20 to 50 individual measurements.
  • in line 4 is the interlaminar contact resistance in ohms. cm2 at a contact pressure of 100 N / cm2 an electrode area of 4 cm and a voltage of 100 mV for the double insulating layer on the electrical sheet before annealing.
  • the evaluation with R 50 means that 50% of the measured values are above the specified resistance value.
  • line 5 the contact resistance is as explained for line 4, but after annealing the insulation layer for one hour at 600 ° C in air.
  • the adherence which also includes a statement about the stretchability of the layer, according to line 6 was determined by bending tests around the conical mandrel.
  • Line 7 shows the area which after annealing for one hour at 600 ° C in air by applying and tearing off an adhesive tape still covers the surface of the steel sheet as firmly adhering insulation.
  • Line 8 lists the corrosion-protecting properties of the insulation layer on steel sheets. The determination was carried out by the climate change test in accordance with DIN 50017, in which the coated sheet metal was first exposed to an atmosphere of 40 ° C. and 100% relative atmospheric humidity for 8 hours and then to a normal room climate for 16 hours.
  • cross cuts up to the metal surface create 1 mm2 fields.
  • the damaged or detached fields are then determined by applying and tearing off an adhesive tape. This determination was carried out in accordance with DIN 53151.
  • Line 11 specifies the permissible speed at which the sheet stack is pressed at a pressure of 250 N / cm2 and a current of 90 to 120 A under an argon atmosphere, a flawless, non-porous weld can be drawn.
  • Line 12 describes the proportion of soot development, which can occur when organic substances are burned, and which is deposited on the edges of the weld.
  • Line 13 shows the stability of the welding electrode when welding the insulated and stacked stamped parts.
  • the information indirectly also contains a statement about the possible length of the achievable welding path, without regrinding and / or readjusting the electrode being necessary.
  • examples 1, 3 and 4 document an excellent welding speed at which non-porous weld seams can be drawn.
  • Example 2 shows that with a thickness of the insulation layer of 4 ⁇ m ⁇ 0.5 ⁇ m a high one Welding speed with a non-porous weld results in comparison to Comparative Examples 2 and 3.
  • Comparative Example 1 shows a high welding speed compared to Example 2, but this can only be achieved with very thin insulation thicknesses of 1 ⁇ m ⁇ 0.5 ⁇ m. Comparative example 1 also shows further decisive disadvantages in comparison with examples 1 to 4 with regard to the stability of the treatment liquid and corrosion protection.
  • Examples 1 to 4 show that, in contrast to Comparative Examples 1 to 3, the invention combines all the good properties which are desirable for electrically insulating layers on steel sheets for the production of magnetic cores.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Insulating Bodies (AREA)
EP88109337A 1987-06-17 1988-06-11 Verfahren zur Erzeugung elektrisch isolierender Überzüge auf Metalloberflächen Ceased EP0298277A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3720217 1987-06-17
DE19873720217 DE3720217A1 (de) 1987-06-17 1987-06-17 Verfahren zur erzeugung elektrisch isolierender ueberzuege auf metalloberflaechen

Publications (1)

Publication Number Publication Date
EP0298277A1 true EP0298277A1 (de) 1989-01-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP88109337A Ceased EP0298277A1 (de) 1987-06-17 1988-06-11 Verfahren zur Erzeugung elektrisch isolierender Überzüge auf Metalloberflächen

Country Status (9)

Country Link
US (1) US4942061A (enrdf_load_stackoverflow)
EP (1) EP0298277A1 (enrdf_load_stackoverflow)
JP (1) JPH02500448A (enrdf_load_stackoverflow)
KR (1) KR900000132A (enrdf_load_stackoverflow)
AU (1) AU607785B2 (enrdf_load_stackoverflow)
DD (1) DD284776A5 (enrdf_load_stackoverflow)
DE (1) DE3720217A1 (enrdf_load_stackoverflow)
IN (1) IN169533B (enrdf_load_stackoverflow)
WO (1) WO1988010288A1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2160794C2 (ru) * 1998-10-01 2000-12-20 Акционерное общество открытого типа "Русские самоцветы" Состав для защиты поверхностей металлических изделий при локальной обработке
EP1291451A4 (en) * 2001-04-12 2008-12-24 Jfe Steel Corp MAGNETIC SHEET HAVING AN INSULATING COATING, AND INSULATING COATING
CN109663729A (zh) * 2018-12-28 2019-04-23 南通苏源恒炫电气有限公司 固体绝缘开关设备绝缘箱涂覆层工艺

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JP3330045B2 (ja) * 1996-03-01 2002-09-30 日産自動車株式会社 ネジ部品の表面処理方法
JP3736958B2 (ja) * 1998-01-14 2006-01-18 日本パーカライジング株式会社 金属表面の耐食被覆方法
US6395336B1 (en) * 1998-01-14 2002-05-28 Henkel Corporation Process for improving the corrosion resistance of a metal surface
GB2338115B (en) * 1998-04-14 2002-08-07 Gec Alsthom Ltd Improvements in or relating to rotor cores for electrical rotating machines
EP0999252B1 (en) * 1998-05-19 2003-08-20 Sony Chemicals Corporation Flame-retardant adhesive, flame-retardant adhesive film and flat cable made using the same
US6764765B2 (en) 1998-05-19 2004-07-20 Sony Chemicals Corporation Fire-retardant adhesive, fire-retardant adhesive film using the same, and flat cable
DE19851576A1 (de) * 1998-11-09 2000-05-11 Herberts Gmbh Wäßrige Basislacke und ihre Verwendung zur Mehrschichtlackierung
US6455100B1 (en) * 1999-04-13 2002-09-24 Elisha Technologies Co Llc Coating compositions for electronic components and other metal surfaces, and methods for making and using the compositions
US6524380B1 (en) 2000-03-06 2003-02-25 Hamilton Sundstrand Corporation Magnesium methylate coatings for electromechanical hardware
US20040126483A1 (en) * 2002-09-23 2004-07-01 Heimann Robert L. Coating compositions for electronic components and other metal surfaces, and methods for making and using the compositions
SG110055A1 (en) * 2003-06-11 2005-04-28 Sumitomo Bakelite Singapore Pt Resin composition for mold cavity surface conditioning
US8432663B2 (en) * 2007-10-05 2013-04-30 Carver Scientific, Inc. High permittivity low leakage capacitor and energy storing device and method for forming the same
US9011627B2 (en) * 2007-10-05 2015-04-21 Carver Scientific, Inc. Method of manufacturing high permittivity low leakage capacitor and energy storing device
US8940850B2 (en) 2012-08-30 2015-01-27 Carver Scientific, Inc. Energy storage device
US9214281B2 (en) * 2008-10-03 2015-12-15 Carver Scientific, Inc. Very thin dielectrics for high permittivity and very low leakage capacitors and energy storing devices
US9214280B2 (en) * 2008-10-03 2015-12-15 Carver Scientific, Inc. Very thin dielectrics for high permittivity and very low leakage capacitors and energy storing devices
US10227432B2 (en) 2011-08-31 2019-03-12 Carver Scientific, Inc. Formation of xylylene type copolymers, block polymers, and mixed composition materials
US10199165B2 (en) 2012-08-30 2019-02-05 Carver Scientific, Inc. Energy storage device
US9899846B2 (en) 2012-08-30 2018-02-20 Carver Scientific, Inc. Entropic energy transfer methods and circuits
US9805869B2 (en) 2012-11-07 2017-10-31 Carver Scientific, Inc. High energy density electrostatic capacitor
EP3371811B1 (en) 2015-11-06 2022-11-23 Carver Scientific, Inc. Electroentropic memory device
SG10201912363TA (en) 2016-12-02 2020-02-27 Carver Scientific Inc Memory device and capacitive energy storage device

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WO1985000496A2 (en) * 1983-11-22 1985-02-14 Udviklingsselskabet Af 31.10.1983 Aps Paint
EP0209940A1 (de) * 1985-07-17 1987-01-28 Stahlwerke Bochum AG Verfahren zum Aufbringen einer Isolierschicht

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DE1246071B (de) * 1961-02-20 1967-08-03 R W Moll & Co Verwendung waessriger Dispersionen von Kunststoffen oder von kunststoffaehnlichen Naturprodukten zur Bildung elektrisch trennender UEberzuege auf Elektrobleche
WO1985000496A2 (en) * 1983-11-22 1985-02-14 Udviklingsselskabet Af 31.10.1983 Aps Paint
EP0209940A1 (de) * 1985-07-17 1987-01-28 Stahlwerke Bochum AG Verfahren zum Aufbringen einer Isolierschicht

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2160794C2 (ru) * 1998-10-01 2000-12-20 Акционерное общество открытого типа "Русские самоцветы" Состав для защиты поверхностей металлических изделий при локальной обработке
EP1291451A4 (en) * 2001-04-12 2008-12-24 Jfe Steel Corp MAGNETIC SHEET HAVING AN INSULATING COATING, AND INSULATING COATING
CN109663729A (zh) * 2018-12-28 2019-04-23 南通苏源恒炫电气有限公司 固体绝缘开关设备绝缘箱涂覆层工艺

Also Published As

Publication number Publication date
KR900000132A (ko) 1990-01-30
JPH02500448A (ja) 1990-02-15
DE3720217A1 (de) 1988-12-29
AU1940188A (en) 1989-01-19
DD284776A5 (de) 1990-11-21
IN169533B (enrdf_load_stackoverflow) 1991-11-09
WO1988010288A1 (en) 1988-12-29
DE3720217C2 (enrdf_load_stackoverflow) 1992-02-27
AU607785B2 (en) 1991-03-14
US4942061A (en) 1990-07-17

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