EP0192523B1 - Biegsames elektrisches Isolierungsmaterial und Verfahren zu dessen Herstellung - Google Patents

Biegsames elektrisches Isolierungsmaterial und Verfahren zu dessen Herstellung Download PDF

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Publication number
EP0192523B1
EP0192523B1 EP86400157A EP86400157A EP0192523B1 EP 0192523 B1 EP0192523 B1 EP 0192523B1 EP 86400157 A EP86400157 A EP 86400157A EP 86400157 A EP86400157 A EP 86400157A EP 0192523 B1 EP0192523 B1 EP 0192523B1
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EP
European Patent Office
Prior art keywords
resin
support
flexible
mineral powder
insulating material
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.)
Expired
Application number
EP86400157A
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English (en)
French (fr)
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EP0192523A1 (de
Inventor
Jean-Paul Joubert
Pierre Mateu
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.)
D'exploitation Generale De Produits Industriels (seg) Ste
Original Assignee
D'exploitation Generale De Produits Industriels (seg) Ste
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9315705&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0192523(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by D'exploitation Generale De Produits Industriels (seg) Ste filed Critical D'exploitation Generale De Produits Industriels (seg) Ste
Priority to AT86400157T priority Critical patent/ATE35094T1/de
Publication of EP0192523A1 publication Critical patent/EP0192523A1/de
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    • 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
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/12—Processes 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • H01B17/60—Composite insulating bodies

Definitions

  • the present invention relates to a flexible electrical insulating material and to its manufacturing process, the aforementioned material being more specially adapted by its performance to use in the field of construction of electrical machines and in electro-mechanics in general.
  • flexible insulators are currently used to insulate conductors or groups of conductors inserted in the notches of the pole pieces of rotating machines, in particular these flexible insulators in the form of sheets or ribbons of appropriate dimensions being for example intended to ensure the separation and the insulation of groups of conductors each constituting a phase of the winding of the motor or of the rotary machine.
  • complex products comprising a support, generally a polyester film, on the faces of which are deposited polyester felts, calendered or non-calendered papers such as aromatic polyamides, or mats such as glass mats or glass fabric, the whole being optionally impregnated with a resin by varnishing.
  • a support generally a polyester film, varnished by means of an organic resin, and are especially used to allow the heat-weldability of the support.
  • the present invention overcomes the aforementioned drawbacks by implementing a method of manufacturing a material and a material whose performance is significantly improved.
  • the process for manufacturing a flexible electrical insulating material consists in depositing on a flexible support a resin loaded with mineral fillers, constituted by a finely divided mineral powder of particle size less than 40 ⁇ m in order to improve the thermal and dielectric properties of the latter, the resin prior to deposition, being formed by a complex obtained by mixing an organic binder material and mineral powder and the deposition of the resin on the support being effected by coating, the assembly consisting of the coated support resin, following the deposition of the resin on the support, being polymerized hot melt said polymerization being performed by progressively temperature stages between 100 ° C and 200 ° C.
  • the flexible electrical insulating material thus obtained comprises a central core, or flexible support, constituted by a plastic material, and a coating of the central core formed by a resin layer consisting of an organic material loaded with a mineral powder in proportions determined, said coating further comprising a bonding or coupling agent between the organic material and the mineral powder, the mineral powder being finely divided and of particle size less than 40 ⁇ m.
  • the invention finds application in the field of electrical or electro-mechanical construction, but also in the field of construction of electronic devices, in particular in industrial electronics.
  • FIG. 1 The process for manufacturing a flexible electrical insulating material of the invention will firstly be described by means of FIG. 1.
  • This process consists in depositing on a flexible support a resin loaded with mineral fillers in order to improve the thermal and dielectric properties of the latter.
  • the process without limitation, is shown in the form of a continuous manufacturing process.
  • the flexible support S formed in the form of a feed roller A and formed in a strip is conventionally engaged in a drive assembly constituted by drive rollers RE and guide rollers RG.
  • various stations are provided for carrying out the various stages of the method, hereinafter explained.
  • the support is, before depositing the resin, treated so as to make the faces of the support sufficiently rough.
  • this treatment is noted T.
  • This treatment can be either for example a mechanical treatment, or an electrical treatment. Electrical treatment will however be preferred to mechanical treatment.
  • the treatment carried out is a treatment of the CORONA effect treatment type.
  • the voltage applied to the CORONA effect treatment electrodes is determined as a function of the thickness of the support S or strip, and as a function of the speed of travel thereof.
  • the thickness of the support is determined as a function of the nature of the latter.
  • the thickness e of the support can be between 23 ⁇ . ⁇ .m and 350 wm.
  • the support can be constituted by a glass fabric of thickness e between 5/100 mm and 35/100 mm, the production of a glass fabric support allowing an improvement of the mechanical properties of the final material. , with regard to resistance to aging.
  • the support can also consist of an aromatic polyamide paper normally available on the market.
  • the thickness of the paper can be chosen between 5/100 mm and 13/100 mm for example.
  • the support S can also consist of a material of the fluoropolymer film type sold by the company HOECHST under the reference L 601.
  • the thickness of the support in the latter case can be taken between limits varying from 50 4 m to 100 ⁇ m.
  • the latter material because of its better temperature resistance, 170 ° C continuously, may be chosen for the production of a flexible insulating material with improved temperature resistance.
  • the strip is directed towards a coating unit denoted E making it possible to deposit the resin on the support.
  • the resin is formed by a complex obtained by mixing an organic binder material and a mineral powder.
  • the organic material consists of a polymerizable material based on acrylic material, polyurethane, epoxides or silicone.
  • the mineral powder is preferably finely divided, and with a particle size of less than 40 ⁇ m.
  • the above particle size values allow better homogeneity of the final material.
  • the mineral powder can consist of mica powder, which has the advantage of not generating an absorption phenomenon of the products constituting the resin, a phenomenon always detrimental to the mechanical and ultimately electrical qualities of the insulating material.
  • the mica powder can however be replaced by glass beads of the same particle size.
  • Coupling agents can also be added to the organic resin in order to allow a perfect bond between the latter and the mineral fillers.
  • the coupling agents can be constituted by silanes, carbon derivatives of silicon, and ensure a better bond between the grains of the mineral powder and the resin.
  • the resin can advantageously be prepared, but not necessary, from a solvent constituted for example by aromatic hydrocarbons.
  • a solvent constituted for example by aromatic hydrocarbons.
  • the resin a polyurethane resin for example, is first dissolved in the solvent.
  • the coupling agents mentioned above are added to the solution.
  • the mineral filler is added to the assembly, the resin being ready for application to the support.
  • an amount by weight of solvent an amount of polyurethane resin between 80 and 30% of the weight of the solvent will be dissolved in the solvent and an additional amount of mineral powder such as mica, between 20 and 70% by weight of solvent will then be added.
  • the loaded resin is ready to be deposited on the faces of the support.
  • the resin previously prepared is introduced into the coating assembly referenced E so as to forming a bath into which the support constituent strip is introduced and moved.
  • the deposition of the charged resin is thus carried out by coating. This deposition can moreover without disadvantage be carried out more commonly by projection or by means of a doctor blade.
  • the strip on which the charged resin has been deposited by crossing the bath is then introduced into a die referenced F.
  • the die F makes it possible to determine the thickness of charged resin which will be actually kept on each side of the tape. By way of nonlimiting example, this thickness for each face can be taken equal to 50 ⁇ m and advantageously between 20 JJ.m and 200 ⁇ m.
  • the final thickness of the layer of charged resin applied to the faces of the strip determines the mechanical properties of the final material.
  • the support being generally, in particular when it is made of polyester, more rigid than the charged resin, the thickness of the layers of charged resin applied to the faces of the support will be chosen to be small, that is to say in the vicinity of the aforementioned value of 20 ⁇ m, when the final material is intended for applications in which a more rigid insulation is sought.
  • the thickness of the layers of charged resin applied to the faces of the support will be chosen in the vicinity of the upper limit value of 200 ⁇ m, when the final material is intended for applications in which a more flexible insulator is sought.
  • the polymerization assembly P is for example constituted by a modular assembly, each of the modules being capable of carrying and maintaining a determined portion of strip at a determined temperature for a determined time, depending on the speed of travel of the strip.
  • the first module makes it possible to bring the strip coated with resin to a temperature of 100 ° C.
  • Successive assemblies make it possible, in successive temperature stages of the order of 20 ° C., to bring the strip to the level of a final module at a temperature of the order of 200 ° C.
  • the solvent present in the coating layers when this solvent has been used, is removed by evaporation at the first polymerization module.
  • the strip provided with its loaded resin coating is then gradually brought in increments of 20 ° C, to the temperature of 180 ° C at which the actual polymerization is started, the latter being completed in the final module at the temperature of 200 ° vs.
  • the final material can be conditioned after cooling in the form of a storage roller, referenced ST in FIG. 1. The gradual rise in temperature of the polymerization phase makes it possible to avoid the phenomenon of bubbling, that is to say creation of gas bubbles within the insulating material.
  • the resin thermoset which at the level of the final material resists the impregnation varnishes used in the construction of motors or electro-mechanical machines, and moreover resists the heating thereof during their operation.
  • the holding time of the strip coated with a layer of resin with a thickness of 50 ⁇ m per face at the temperature of 200 ° C. at the level of the last polymerization module is of the order of 1 min. for a tape running speed of 5 m / min.
  • the material produced in the form of a film comprises a central core 1 or flexible support.
  • the material can also be produced in the form of sheets, that is to say a strip of sufficient width, the strip then being cut into sheets or pieces of various shapes.
  • a coating of the central core 1, is formed by an upper 2 and lower 3 layer of resin constituted by the organic material or materials loaded with a mineral powder as described above.
  • the central core 1 is constituted by a plastic material such as a polyester (polyethylene terephthalate) or by a glass fabric, an aromatic polyamide or a fluoropolymer material.
  • the upper 2 and lower 3 layers consist of an organic material such as a polymerizable material based on acrylic material, polyurethane, epoxides or silicone.
  • the upper and lower layers 2 and 3 comprising inclusions formed by the mineral powder, which consists of mica powder or glass beads with a particle size of less than 40 J.Lm.
  • the inclusions 20 of the upper layer 2 or the inclusions 30 of the lower layer 3 are surrounded by a thin layer formed by the bonding agent ensuring the coupling between the organic material and the mineral powder.
  • the thin layer 21 is a mono-molecular or substantially mono-molecular layer, formed over the entire surface of the grain, forming inclusion, and lining it. The thin layer formed at each inclusion by the bonding agent prevents foreign chemical substances from being able to enter the interstices which may still exist between the grains of the mineral powder and the resin.
  • the upper and lower layers 2 and 3 thus make it possible to protect the support constituted for example by a polyester film from the heat attack and thus make it possible to increase the lifetime of the support and of the final material.
  • an aging test known as the curved electrode test was carried out under the conditions specified in the note published by the International Electro-technical Committee, under reference No. 370 year 1971.
  • This test carried out on a final material comprising a support of the polyester film type made it possible to note a temperature resistance clearly above 145 ° C. of the final material over a continuous period of 20,000 hours, while under similar test conditions , the temperature resistance of bare polyester does not exceed 130 ° C.

Landscapes

  • Insulating Bodies (AREA)
  • Organic Insulating Materials (AREA)
  • Inorganic Insulating Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Insulated Conductors (AREA)
  • Laminated Bodies (AREA)
  • Communication Cables (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)

Claims (9)

1. Verfahren zur Herstellung eines biegsamen elektrischen Isolierungsmaterials, wobei besagtes Verfahren darin besteht, auf einem biegsamen Träger ein Harz aufzubringen, das mit mineralischen Füllstoffen durchsetzt ist, die aus feinverteiltem Mineralpulver einer Kornklassierung unterhalb von 40 J.Lm bestehen, um die thermischen und dielektrischen Eigenschaften des letzteren zu verbessern, wobei das Harz vor dem Aufbringen aus einem Komplex besteht, der durch Mischung eines organischen Bindermaterials und des Mineralpulvers erhalten wird, und das Aufbringen des Harzes auf den Träger durch Beschichten durchgeführt wird, wobei das Ganze, bestehend aus dem mit Harz beschichteten Träger, nach dem Aufbringen des Harzes auf den Träger heißpolymerisiert wird, wobei besagte Heißpolymerisation schrittweise in Temperaturstufen zwischen 100 °C und 200 °C durchgeführt wird.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Träger vor dem Aufbringen des Harzes elektrisch behandelt wird.
3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Träger vor dem Aufbringen des Harzes mechanisch behandelt wird.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß Kopplungsagentien dem organischen Harz zugesetzt werden, um eine vollkommene Bindung zwischen diesem und den mineralischen Füllstoffen zu ermöglichen.
5. Biegsames, elektrisches Isolierungsmaterial, gekennzeichnet durch :
- eine Mittelschicht (1) oder einen biegsamen Träger, bestehend aus einem Kunststoffmaterial, einem Glasgewebe oder einem papier aus aromatischem Polyamid,
- ein Überzug (2, 3) der Mittelschicht, der von einer Harzschicht gebildet wird, die aus einem organischen Material besteht, das mit einem Mineralpulver in bestimmten Verhältnissen durchsetzt ist, wobei der Überzug darüber hinaus ein Agens zur Bindung oder Kupplung zwischen dem organischen Material und dem Mineralpulver enthält und das Mineralpulver feinverteilt und von einer Kornklassierung unterhalb von 40 µm ist.
6. Biegsames Isolierungsmaterial nach Anspruch 5, dadurch gekennzeichnet, daß die Mittelschicht (1) aus einem Kunststoffmaterial wie einem Polyester (Polyethylenglykolterephtalat) besteht.
7. Biegsames Isolierungsmaterial nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, daß das organische Material aus einem polymerisierbaren Material auf der Basis von Acrylmaterial, polyurethan, Epoxiden oder Silikon besteht.
8. Biegsames Isolierungsmaterial nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß das Mineralpulver ein Mikapulver ist.
EP86400157A 1985-01-29 1986-01-27 Biegsames elektrisches Isolierungsmaterial und Verfahren zu dessen Herstellung Expired EP0192523B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86400157T ATE35094T1 (de) 1985-01-29 1986-01-27 Biegsames elektrisches isolierungsmaterial und verfahren zu dessen herstellung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8501199A FR2576545B1 (fr) 1985-01-29 1985-01-29 Procede de fabrication d'un materiau isolant electrique souple et materiau isolant electrique souple obtenu par ce procede
FR8501199 1985-01-29

Publications (2)

Publication Number Publication Date
EP0192523A1 EP0192523A1 (de) 1986-08-27
EP0192523B1 true EP0192523B1 (de) 1988-06-15

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ID=9315705

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EP86400157A Expired EP0192523B1 (de) 1985-01-29 1986-01-27 Biegsames elektrisches Isolierungsmaterial und Verfahren zu dessen Herstellung

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EP (1) EP0192523B1 (de)
AT (1) ATE35094T1 (de)
DE (1) DE3660300D1 (de)
ES (2) ES8706287A1 (de)
FR (1) FR2576545B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4244298C2 (de) * 1992-12-28 2003-02-27 Alstom Isolierband und Verfahren zu seiner Herstellung
US6242825B1 (en) * 1998-11-25 2001-06-05 Hitachi, Ltd. Electric rotating machine with reduced thickness and volume of insulation
JP2002030212A (ja) * 2000-06-29 2002-01-31 Three M Innovative Properties Co 熱伝導性シート

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041824A1 (de) * 1980-06-11 1981-12-16 Associated Electrical Industries Limited Verfahren zur Herstellung elektrischer Isolierung

Also Published As

Publication number Publication date
EP0192523A1 (de) 1986-08-27
ES296169U (es) 1988-02-16
ES551339A0 (es) 1987-06-16
FR2576545A1 (fr) 1986-08-01
FR2576545B1 (fr) 1987-05-22
ATE35094T1 (de) 1988-07-15
ES8706287A1 (es) 1987-06-16
DE3660300D1 (en) 1988-07-21
ES296169Y (es) 1988-11-01

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