EP1086470B1 - Method for making a micaceous product preferably in the form of a mica tape and resulting product - Google Patents
Method for making a micaceous product preferably in the form of a mica tape and resulting product Download PDFInfo
- Publication number
- EP1086470B1 EP1086470B1 EP99928915A EP99928915A EP1086470B1 EP 1086470 B1 EP1086470 B1 EP 1086470B1 EP 99928915 A EP99928915 A EP 99928915A EP 99928915 A EP99928915 A EP 99928915A EP 1086470 B1 EP1086470 B1 EP 1086470B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resin
- mica
- support
- solvent
- mica sheet
- 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.)
- Revoked
Links
- 239000010445 mica Substances 0.000 title claims abstract description 78
- 229910052618 mica group Inorganic materials 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 36
- 229920005989 resin Polymers 0.000 claims abstract description 66
- 239000011347 resin Substances 0.000 claims abstract description 66
- 238000000576 coating method Methods 0.000 claims abstract description 25
- 239000011248 coating agent Substances 0.000 claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000004744 fabric Substances 0.000 claims description 22
- 238000005470 impregnation Methods 0.000 claims description 22
- 239000002904 solvent Substances 0.000 claims description 17
- 239000004593 Epoxy Substances 0.000 claims description 6
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052627 muscovite Inorganic materials 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- LCFVJGUPQDGYKZ-UHFFFAOYSA-N Bisphenol A diglycidyl ether Chemical compound C=1C=C(OCC2OC2)C=CC=1C(C)(C)C(C=C1)=CC=C1OCC1CO1 LCFVJGUPQDGYKZ-UHFFFAOYSA-N 0.000 claims 1
- RJDOZRNNYVAULJ-UHFFFAOYSA-L [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Mg++].[Mg++].[Mg++].[Al+3].[Si+4].[Si+4].[Si+4].[K+] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[F-].[F-].[Mg++].[Mg++].[Mg++].[Al+3].[Si+4].[Si+4].[Si+4].[K+] RJDOZRNNYVAULJ-UHFFFAOYSA-L 0.000 claims 1
- -1 nitrogenous compound Chemical class 0.000 claims 1
- 150000002902 organometallic compounds Chemical class 0.000 claims 1
- 229910052628 phlogopite Inorganic materials 0.000 claims 1
- 229920001296 polysiloxane Polymers 0.000 claims 1
- 229910052902 vermiculite Inorganic materials 0.000 claims 1
- 239000010455 vermiculite Substances 0.000 claims 1
- 235000019354 vermiculite Nutrition 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 239000011521 glass Substances 0.000 description 16
- 239000003822 epoxy resin Substances 0.000 description 12
- 229920000647 polyepoxide Polymers 0.000 description 12
- 239000007788 liquid Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000007787 solid Substances 0.000 description 8
- 239000002966 varnish Substances 0.000 description 8
- 239000000843 powder Substances 0.000 description 5
- 238000005507 spraying Methods 0.000 description 5
- 210000001519 tissue Anatomy 0.000 description 5
- 241001639412 Verres Species 0.000 description 4
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- 229920006267 polyester film Polymers 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 2
- YFXPPSKYMBTNAV-UHFFFAOYSA-N bensultap Chemical compound C=1C=CC=CC=1S(=O)(=O)SCC(N(C)C)CSS(=O)(=O)C1=CC=CC=C1 YFXPPSKYMBTNAV-UHFFFAOYSA-N 0.000 description 2
- 238000010292 electrical insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013464 silicone adhesive Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
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- 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
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/251—Mica
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2852—Adhesive compositions
- Y10T428/287—Adhesive compositions including epoxy group or epoxy polymer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2911—Mica flake
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2738—Coating or impregnation intended to function as an adhesive to solid surfaces subsequently associated therewith
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2738—Coating or impregnation intended to function as an adhesive to solid surfaces subsequently associated therewith
- Y10T442/2746—Heat-activatable adhesive
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2926—Coated or impregnated inorganic fiber fabric
- Y10T442/2951—Coating or impregnation contains epoxy polymer or copolymer or polyether
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2926—Coated or impregnated inorganic fiber fabric
- Y10T442/2975—Coated or impregnated ceramic fiber fabric
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2926—Coated or impregnated inorganic fiber fabric
- Y10T442/2992—Coated or impregnated glass fiber fabric
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3927—Including a paper or wood pulp layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3927—Including a paper or wood pulp layer
- Y10T442/3935—Mica paper layer
Definitions
- the present invention relates to the production of a micaceous product preferably presented in the form of a mica tape comprising a support coated with a solvent-free resin combined with a sheet of mica.
- the present invention is relates to a process for producing a mica tape capable of impregnation subsequent to the production process itself.
- the present invention also relates to a new micaceous product.
- micaceous ribbons are presented under the form of a support impregnated with a resin, for example epoxy, combined with a sheet of mica.
- a resin for example epoxy
- This mica sheet can be mica paper, possibly reinforced with a small amount of resin, for example epoxy.
- the first family includes the ribbons called "saturated ribbons” or “prepreg”, which are ribbons made from heavily impregnated mica paper using a Novolac type resin and having as support a glass cloth.
- the resin content is usually between 30 and 40% of the total weight of the ribbon.
- the epoxy resin is brought to stage B, i.e. it has already undergone curing. Then, this type of product could be wrapped on the part to be insulated and will then undergo a heat treatment of the order of 160 to 180 ° C.
- the document EP-A-0735071 describes a solvent-free resin composition optionally intended the manufacture of a saturated micaceous tape, that is to say already fully impregnated and therefore presenting a relatively high resin content.
- GB-A-2083849 describes a method of production of insulation tapes which consists in carrying out impregnation of a mica support at room temperature at using a solvent-free resin followed by a attachment to a support and heating of the assembly so as to reduce the viscosity of the resin, which will favor the deep impregnation of mica paper.
- a "prepreg" type ribbon and therefore already strongly permeated.
- the second family includes the so-called ribbons "porous", which have a relatively high resin content low of the order of 4 and 10% by total weight of the ribbon. These tapes are suitable for subsequent impregnation with method of manufacturing said ribbons and will be subject to, after wrapping, to a "VPI (Vacuum Pressure) treatment Impregnation) ", which allows you to perform in a second impregnation with resin usually without solvent.
- the "IPV” treatment consists of immersing in the impregnating resin copper parts wrapped with porous mica tape, applying vacuum to remove any inclusion of air; then we cut the vacuum and apply pressure for several hours in order to make the post-impregnation resin penetrate into mica insulation. The whole process of post-impregnation as well as the temperature of the resin are imposed by the nature of this resin, the thickness of the insulation to be impregnated and the porosity of the mica tape used.
- Dry ribbons are obtained before wrapping, very flexible and non-adherent, which are distinguished by a truly exceptional absorbency. They are of this used for high voltage machines (ranging up to 1000 MVA).
- Another possibility is to impregnate a mica sheet with a liquid accelerator or a solution of a liquid or solid accelerator in a solvent with low boiling point, then sprinkle with hardener-free powder varnish mica sheet impregnated, and then either to impregnate a glass cloth a liquid accelerator or a solution of a liquid or solid accelerator in a low point solvent of boiling by sticking the support thus obtained by a action of heat and pressure with the side of the sheet of fine mica sprinkled with powder varnish, either to stick the felt serving as support by an action of pressure and heat with the side of the fine mica sheet sprinkled with powder varnish.
- the sprinkling of a varnish requires the use of a certain amount of it.
- the varnish will tend when sprinkled on the support, to pass through the meshes and to be found on both sides of the support.
- the present invention aims to provide a process for manufacturing micaceous products suitable for impregnation which requires the use of a low rate resin.
- the present invention aims to provide a technique which avoids the use of solvents for the preparation of micaceous products suitable for impregnation such as porous mica ribbons.
- the present invention also aims to allow the production of such ribbons having a increased flexibility while having grip qualities sufficient or even increased.
- the present invention aims to propose, in the particular case of the realization of Coiled ribbons, a process which avoids the problem of bonding between successive turns.
- processing temperature of coating it means that the resin must be present under a non-solid form, that is to say in a more or less state viscous or liquid.
- pressure and temperature means a treatment at a temperature between 40 and 200 ° C for a pressure included between 0 and 20 bars to allow the connection of the support with mica sheet.
- resin intended for coating there may be mentioned epoxy resins solvent-free, solvent-free silicone adhesives or any other solvent-free resin with adequate viscosity at the temperatures at which the coating is used.
- the medium can be either a film or fabric, or a felt.
- the mica sheet is preferably a classic mica paper made according to usual stationery techniques.
- This mica paper can be 100% mica paper or possibly mica paper previously reinforced with resin impregnation, for example epoxy, by a setting process in conventional work such as impregnation by coating optionally in a solvent medium.
- the accelerator is then directly mixed with the resin.
- an accelerator in the form of a nitrogen compound such as an amine or a compound organometallic such as Zinc Naphtenate, or any other compound having the desired catalytic effect.
- a second object of the present invention is relates to a micaceous product suitable for impregnation comprising a support coated with a solvent-free resin associated with a mica sheet, characterized in that the resin content is between 1 and 10%, the support being a fabric on which resin deposits appear basically on the weft threads at the intersection with the chain threads.
- the support is a tissue there will be resin deposits basically on the intersections of the weft threads with those of the chain. More specifically, we will observe traces of resin only at intersections where the weft thread is superimposed on that of the chain. This allows to obtain particularly advantageous very precise adjustment the resin content on the finished ribbon, and the rate resin is significantly lower than for products obtained by the processes of the state of the art (spraying or using a solid powder). This allows furthermore to preserve or even increase characteristics of flexibility and limiting the risks of bonding between turns when the ribbon is wound.
- the fabric will be a woven glass fiber fabric or silk, having a grammage of 20 to 50 g / m 2 .
- the mica sheet, and preferably the mica paper, has a basis weight between 100 and 250 g / m 2 .
- Figure 1 shows a schematic view of a device intended to carry out the method according to the invention.
- This device comprises on the one hand a station of coating consisting essentially of several successive cylinders, and preferably four cylinders (1, 2, 3 and 4), which allow the coating of a very low amount of resin on the support.
- This coating unit is followed by a lamination unit which brings the two elements, i.e. the mica sheet and the support, in contact, and which exerts on the whole an action of pressure and temperature as described in figure 2.
- This action pressure is carried out using two cylinders (5 and 6). Preferably, only one of the two cylinders will be heated.
- ribbon A The characteristics of a mica tape as well performed (ribbon A) are shown in Table I and compared with those of a ribbon made by the so-called classical technique spraying in solvent medium (ribbon B).
- ribbon A manufactured according to the process described above contains resin content below the rate normally required for a ribbon B manufactured by the classic spraying technique in solvent medium.
- tape A has better flexibility, more high porosity and better tensile strength than tape B.
- Tape A is also completely dry on the outside of the glass fabric since the resin is only located at the interface between the fabric of glass and mica paper, this characteristic limits the risks of sticking between turns of the wound ribbon.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Insulating Bodies (AREA)
- Laminated Bodies (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Inorganic Insulating Materials (AREA)
- Reinforced Plastic Materials (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
La présente invention se rapporte à la réalisation d'un produit micacé se présentant de préférence sous la forme d'un ruban de mica comprenant un support enduit d'une résine sans solvant associé à une feuille de mica.The present invention relates to the production of a micaceous product preferably presented in the form of a mica tape comprising a support coated with a solvent-free resin combined with a sheet of mica.
Plus précisément, la présente invention se rapporte à un procédé de réalisation d'un ruban mica apte à une imprégnation ultérieure au procédé de réalisation lui-même.More specifically, the present invention is relates to a process for producing a mica tape capable of impregnation subsequent to the production process itself.
La présente invention se rapporte également à un nouveau produit micacé.The present invention also relates to a new micaceous product.
L'isolation électrique et éventuellement thermique d'éléments en cuivre composant les moteurs électriques tels que des barres ou des bobines, est réalisée par l'enrubannage desdites pièces à l'aide de produits micacés, plus précisément de rubans micacés. Electrical insulation and possibly heating of copper elements making up the motors such as bars or coils, is carried out by wrapping said parts using micaceous products, more specifically micaceous ribbons.
Ces rubans micacés se présentent sous la forme d'un support imprégné d'une résine, par exemple époxy, associé à une feuille de mica. Cette feuille de mica peut être du papier mica, éventuellement renforcée au moyen d'une faible quantité de résine, par exemple époxy.These micaceous ribbons are presented under the form of a support impregnated with a resin, for example epoxy, combined with a sheet of mica. This mica sheet can be mica paper, possibly reinforced with a small amount of resin, for example epoxy.
Parmi ces rubans, deux grandes familles coexistent.Among these ribbons, two large families coexist.
La première famille comprend les rubans appelés "rubans saturés" ou encore "prepreg", qui sont des rubans fabriqués à partir de papier mica fortement imprégné à l'aide d'une résine de type Novolaque et ayant comme support un tissu de verre. La teneur en résine est habituellement comprise entre 30 et 40% du poids total du ruban.The first family includes the ribbons called "saturated ribbons" or "prepreg", which are ribbons made from heavily impregnated mica paper using a Novolac type resin and having as support a glass cloth. The resin content is usually between 30 and 40% of the total weight of the ribbon.
Au cours de la fabrication, la résine époxy est amenée au stade B, c'est-à-dire qu'elle a déjà subi un durcissement. Ensuite, ce type de produit pourra être enrubanné sur la pièce à isoler et subira ensuite un traitement thermique de l'ordre de 160 à 180 °C.During manufacturing, the epoxy resin is brought to stage B, i.e. it has already undergone curing. Then, this type of product could be wrapped on the part to be insulated and will then undergo a heat treatment of the order of 160 to 180 ° C.
Le document JP-07149928 décrit un produit se présentant sous la forme d'un ruban mica saturé fabriqué de manière classique. Il semble qu'une résine époxy sans solvant soit ensuite utilisée dans la seconde phase de la fabrication, c'est-à-dire après l'enrubannage du ruban sur la machine, en vue d'obtenir l'isolation électrique adéquate.Document JP-07149928 describes a product in the form of a saturated mica tape made of classic way. It seems that an epoxy resin without solvent is then used in the second phase of the manufacturing, i.e. after wrapping the ribbon on the machine, in order to obtain electrical insulation adequate.
Le document EP-A-0735071 décrit une composition de résine sans solvant éventuellement destinée à la fabrication d'un ruban micacé de type saturé, c'est-à-dire déjà totalement imprégné et présentant de ce fait un taux de résine relativement élevé. The document EP-A-0735071 describes a solvent-free resin composition optionally intended the manufacture of a saturated micaceous tape, that is to say already fully impregnated and therefore presenting a relatively high resin content.
Le document GB-A-2083849 décrit un procédé de réalisation de rubans d'isolation qui consiste à effectuer une imprégnation d'un support mica à température ambiante à l'aide d'une résine sans solvant suivie d'une solidarisation à un support et d'un chauffage de l'ensemble de manière à réduire la viscosité de la résine, ce qui va favoriser l'imprégnation en profondeur du papier mica. On obtiendra ainsi à nouveau un ruban de type "prepreg" et donc déjà fortement imprégné.GB-A-2083849 describes a method of production of insulation tapes which consists in carrying out impregnation of a mica support at room temperature at using a solvent-free resin followed by a attachment to a support and heating of the assembly so as to reduce the viscosity of the resin, which will favor the deep impregnation of mica paper. We will again obtain a "prepreg" type ribbon and therefore already strongly permeated.
La seconde famille comprend les rubans dits "poreux", qui présentent un taux de résine relativement faible de l'ordre de 4 et 10% en poids total du ruban. Ces rubans sont aptes à être imprégnés ultérieurement au procédé de fabrication desdits rubans et seront soumis, après enrubannage, à un traitement "VPI (Vacuum Pressure Impregnation)", qui permet d'effectuer dans une seconde phase une imprégnation par une résine habituellement sans solvant. Le traitement "VPI" consiste à immerger dans la résine d'imprégnation les pièces en cuivre enrubannées avec le ruban mica poreux, en appliquant le vide afin d'éliminer toute inclusion d'air; ensuite, on coupe le vide et on applique une certaine pression pendant plusieurs heures afin de faire pénétrer la résine de post-imprégnation dans l'isolant mica. Le déroulement de l'ensemble du processus de post-imprégnation ainsi que la température de la résine sont imposés par la nature de cette résine, l'épaisseur de l'isolation à imprégner et la porosité du ruban mica utilisé.The second family includes the so-called ribbons "porous", which have a relatively high resin content low of the order of 4 and 10% by total weight of the ribbon. These tapes are suitable for subsequent impregnation with method of manufacturing said ribbons and will be subject to, after wrapping, to a "VPI (Vacuum Pressure) treatment Impregnation) ", which allows you to perform in a second impregnation with resin usually without solvent. The "IPV" treatment consists of immersing in the impregnating resin copper parts wrapped with porous mica tape, applying vacuum to remove any inclusion of air; then we cut the vacuum and apply pressure for several hours in order to make the post-impregnation resin penetrate into mica insulation. The whole process of post-impregnation as well as the temperature of the resin are imposed by the nature of this resin, the thickness of the insulation to be impregnated and the porosity of the mica tape used.
On obtient avant enrubannage des rubans secs, très flexibles et non adhérents, qui se distinguent par un pouvoir absorbant vraiment exceptionnel. Ils sont de ce fait utilisés pour des machines à haute tension (allant jusque 1000 MVA).Dry ribbons are obtained before wrapping, very flexible and non-adherent, which are distinguished by a truly exceptional absorbency. They are of this used for high voltage machines (ranging up to 1000 MVA).
Pour réaliser de tels rubans de la seconde famille qui sont considérés comme aptes à l'imprégnation, on connaít la technique du "pistolage" (appelée également en anglais "spraying") qui consiste à épandre et à imprégner un papier mica d'une résine époxy en milieu solvant et ensuite à l'associer à un support.To make such second ribbons family who are considered suitable for impregnation, we know the technique of "spraying" (also called in English "spraying") which consists in spreading and impregnate a mica paper with an epoxy resin in the middle solvent and then to associate it with a support.
Pour réaliser des rubans aptes à l'imprégnation, il est également connu d'utiliser des techniques de poudrage d'une résine solide soit sur une feuille de mica, soit directement sur le support, et de solidariser ensuite les deux éléments par une action de pression et de chaleur. En particulier, la publication EP-A-0194974 a décrit un procédé de préparation de rubans de mica fin aptes à l'imprégnation et comportant un accélérateur incorporé, caractérisé en ce que l'on saupoudre une feuille de mica fin d'un vernis en poudre exempt de durcisseur, ensuite soit on colle le côté de la feuille de mica fin saupoudré du vernis par une action de pression ou de chaleur avec un tissu de verre ou un feutre servant de support, soit on imprègne un tissu de verre d'un accélérateur liquide ou d'une solution d'un accélérateur liquide ou solide dans un solvant à bas point d'ébullition et on colle le support ainsi obtenu par une action de pression et de chaleur avec un côté de la feuille de mica saupoudré de vernis, et ensuite on imprègne le stratifié obtenu avec un accélérateur liquide ou une solution d'un accélérateur liquide ou solide dans un solvant à bas point d'ébullition. Une autre possibilité consiste à imprégner une feuille de mica avec un accélérateur liquide ou une solution d'un accélérateur liquide ou solide dans un solvant à bas point d'ébullition, ensuite à saupoudrer d'un vernis en poudre exempt de durcisseur la feuille de mica imprégnée, et ensuite soit à imprégner un tissu de verre d'un accélérateur liquide ou d'une solution d'un accélérateur liquide ou solide dans un solvant à bas point d'ébullition en collant le support ainsi obtenu par une action de chaleur et de pression avec le côté de la feuille de mica fin saupoudré de vernis en poudre, soit à coller le feutre servant de support par une action de pression et de chaleur avec le côté de la feuille de mica fin saupoudré de vernis en poudre. On observe cependant qu'en utilisant ce procédé, le saupoudrage d'un vernis nécessite l'utilisation d'une certaine quantité de celui-ci. En particulier, le vernis aura tendance, lorsqu'il sera saupoudré sur le support, à passer au travers des mailles et à se retrouver sur les deux faces du support.To make ribbons suitable for impregnation, it is also known to use techniques for dusting a solid resin either on a mica sheet, either directly on the support, and then join the two elements together by an action of pressure and heat. In particular, the publication EP-A-0194974 describes a process for preparing ribbons of fine mica suitable for impregnation and comprising a built-in accelerator, characterized in that one sprinkle a thin sheet of mica with a powder varnish free of hardener, then either stick the side of the sheet of fine mica sprinkled with varnish by an action of pressure or heat with a glass cloth or felt serving as support, either we impregnate a glass cloth with a liquid accelerator or solution of an accelerator liquid or solid in a low boiling solvent and we stick the support thus obtained by an action of pressure and heat with one side of the mica sheet sprinkled with varnish, and then we impregnate the laminate obtained with a liquid accelerator or a solution of liquid or solid accelerator in a low point solvent boiling. Another possibility is to impregnate a mica sheet with a liquid accelerator or a solution of a liquid or solid accelerator in a solvent with low boiling point, then sprinkle with hardener-free powder varnish mica sheet impregnated, and then either to impregnate a glass cloth a liquid accelerator or a solution of a liquid or solid accelerator in a low point solvent of boiling by sticking the support thus obtained by a action of heat and pressure with the side of the sheet of fine mica sprinkled with powder varnish, either to stick the felt serving as support by an action of pressure and heat with the side of the fine mica sheet sprinkled with powder varnish. We observe however that by using this process, the sprinkling of a varnish requires the use of a certain amount of it. In particular, the varnish will tend when sprinkled on the support, to pass through the meshes and to be found on both sides of the support.
La présente invention vise à proposer un procédé de fabrication de produits micacés aptes à l'imprégnation qui nécessite l'utilisation d'un faible taux de résine.The present invention aims to provide a process for manufacturing micaceous products suitable for impregnation which requires the use of a low rate resin.
La présente invention vise à proposer une technique qui permette d'éviter l'utilisation de solvants pour la préparation de produits micacés aptes à l'imprégnation tels que les rubans de mica de type poreux.The present invention aims to provide a technique which avoids the use of solvents for the preparation of micaceous products suitable for impregnation such as porous mica ribbons.
La présente invention vise également à permettre la réalisation de tels rubans présentant une souplesse accrue tout en ayant des qualités d'adhérence suffisantes ou même accrues.The present invention also aims to allow the production of such ribbons having a increased flexibility while having grip qualities sufficient or even increased.
En outre, la présente invention vise à proposer, dans le cas particulier de la réalisation de Rubans enroulés, un procédé qui évite le problème de collage entre spires successives.Furthermore, the present invention aims to propose, in the particular case of the realization of Coiled ribbons, a process which avoids the problem of bonding between successive turns.
La présente invention se rapporte tout d'abord à un procédé de réalisation d'un produit micacé apte à l'imprégnation dont la teneur en résine est comprise entre 1 et 10% en poids total du produit obtenu, par association d'au moins un support et une feuille de mica, caractérisé en ce que :
- on effectue une enduction d'une résine sans solvant ou d'un mélange de résines sans solvant, la ou lesdites résines présentant un point de fusion inférieur à la température de mise en oeuvre, sur le support ou sur la feuille de mica à l'aide de plusieurs cylindres d'enduction portés à une température de mise en oeuvre de l'enduction comprise entre 40 et 200°C,
- on associe le support à la feuille de mica, et
- on les soumet à un traitement de pression et de température.
- coating is carried out with a solventless resin or a mixture of solventless resins, the said resin or resins having a melting point below the processing temperature, on the support or on the mica sheet at using several coating rolls brought to a coating processing temperature of between 40 and 200 ° C,
- we associate the support with the mica sheet, and
- they are subjected to a pressure and temperature treatment.
Par "température de mise en oeuvre de l'enduction", il convient de comprendre la température à laquelle est porté le mélange de résine sans solvant afin de pouvoir enduire le support ou la feuille de mica. Cette température est habituellement comprise entre 40 et 200 °C. Ceci signifie que la résine doit se présenter sous une forme non solide, c'est-à-dire à l'état plus ou moins visqueux ou liquide.By "processing temperature of coating ", it’s important to understand the temperature at which is carried the resin mixture without solvent so to be able to coat the support or the mica sheet. This temperature is usually between 40 and 200 ° C. This means that the resin must be present under a non-solid form, that is to say in a more or less state viscous or liquid.
Par "un traitement de pression et de température", on entend un traitement à une température comprise entre 40 et 200 °C pour une pression comprise entre 0 et 20 bars afin de permettre la solidarisation du support à la feuille de mica.By "pressure and temperature "means a treatment at a temperature between 40 and 200 ° C for a pressure included between 0 and 20 bars to allow the connection of the support with mica sheet.
Parmi les exemples possibles de résine destinée à l'enduction, on peut citer les résines époxy sans solvant, les adhésifs silicones sans solvant ou toute autre résine sans solvant présentant une viscosité adéquate aux températures de mise en oeuvre de l'enduction.Among the possible examples of resin intended for coating, there may be mentioned epoxy resins solvent-free, solvent-free silicone adhesives or any other solvent-free resin with adequate viscosity at the temperatures at which the coating is used.
Le support peut être aussi bien un film qu'un tissu, ou encore un feutre. La feuille de mica est de préférence un papier mica classique fabriqué selon les techniques habituelles de papeterie. Ce papier mica peut être un papier 100% mica ou éventuellement un papier mica préalablement renforcé au moyen d'une résine d'imprégnation, par exemple époxy, par un procédé de mise en oeuvre classique tel que l'imprégnation par coating éventuellement en milieu solvant.The medium can be either a film or fabric, or a felt. The mica sheet is preferably a classic mica paper made according to usual stationery techniques. This mica paper can be 100% mica paper or possibly mica paper previously reinforced with resin impregnation, for example epoxy, by a setting process in conventional work such as impregnation by coating optionally in a solvent medium.
On peut envisager d'incorporer un accélérateur soit à la résine utilisée pour l'enduction, soit lors d'une étape préalable lors de la préparation de la feuille de mica dans la résine dite d'imprégnation, ou encore directement sur le support ou sur la feuille de mica elle-même.We can consider incorporating a accelerator either to the resin used for coating, either during a preliminary stage during the preparation of the mica sheet in the so-called impregnation resin, or still directly on the support or on the mica sheet herself.
Dans les premières formes d'exécution, l'accélérateur est alors directement mélangé à la résine. In the first forms of execution, the accelerator is then directly mixed with the resin.
De manière générale, on peut envisager d'utiliser un accélérateur se présentant sous la forme d'un composé azoté tel qu'une amine ou un composé organométallique tel que le Naphténate de Zinc, ou tout autre composé présentant l'effet catalytique désiré. In general, we can consider to use an accelerator in the form of a nitrogen compound such as an amine or a compound organometallic such as Zinc Naphtenate, or any other compound having the desired catalytic effect.
Un second objet de la présente invention se rapporte à un produit micacé apte à l'imprégnation comprenant un support enduit d'une résine sans solvant associé à une feuille de mica, caractérisé en ce que la teneur en résine est comprise entre 1 et 10%, le support étant un tissu sur lequel les dépôts de résine apparaissent essentiellement sur les fils de la trame à l'intersection avec les fils de chaíne. A second object of the present invention is relates to a micaceous product suitable for impregnation comprising a support coated with a solvent-free resin associated with a mica sheet, characterized in that the resin content is between 1 and 10%, the support being a fabric on which resin deposits appear basically on the weft threads at the intersection with the chain threads.
On observe que dans le cas où le support est un tissu, il y aura des dépôts de résine essentiellement sur les intersections des fils de la trame avec ceux de la chaíne. Plus précisément, on observera des traces de résine uniquement aux intersections où le fil de la trame se superpose à celui de la chaíne. Ceci permet d'obtenir de manière particulièrement avantageuse un réglage très précis de la teneur en résine sur le ruban fini, et dont le taux de résine est nettement plus faible que pour les produits obtenus par les procédés de l'état de la technique (pistolage ou utilisation d'une poudre solide). Ceci -permet en outre de préserver ou même d'accroítre les caractéristiques de souplesse et de limiter les risques de collage entre spires lorsque le ruban est enroulé.We observe that in the case where the support is a tissue there will be resin deposits basically on the intersections of the weft threads with those of the chain. More specifically, we will observe traces of resin only at intersections where the weft thread is superimposed on that of the chain. This allows to obtain particularly advantageous very precise adjustment the resin content on the finished ribbon, and the rate resin is significantly lower than for products obtained by the processes of the state of the art (spraying or using a solid powder). This allows furthermore to preserve or even increase characteristics of flexibility and limiting the risks of bonding between turns when the ribbon is wound.
De préférence, le tissu sera un tissu ou une soie en fibres de verre tissées, présentant un grammage de 20 à 50 g/m2. La feuille de mica, et de préférence le papier mica, présente un grammage compris entre 100 et 250 g/m2. Preferably, the fabric will be a woven glass fiber fabric or silk, having a grammage of 20 to 50 g / m 2 . The mica sheet, and preferably the mica paper, has a basis weight between 100 and 250 g / m 2 .
- La figure 1Figure 1
- représente une vue schématique du dispositif destiné à réaliser le procédé d'enduction selon la présente invention.represents a schematic view of the device intended to carry out the coating process according to the present invention.
- La figure 2Figure 2
- représente une vue schématique de la seconde étape du procédé de réalisation d'un ruban micacé selon la présente invention, qui consiste à solidariser le support au papier mica.represents a schematic view of the second step in the process of making a ribbon micaceous according to the present invention, which consists in securing the support to the paper mica.
- La figure 3Figure 3
- représente une description schématique d'un tissu de verre imprégné par la technique décrite.represents a schematic description of a glass fabric impregnated by the technique described.
La figure 1 représente une vue schématique d'un dispositif destiné à réaliser le procédé selon l'invention. Ce dispositif comprend d'une part un poste d'enduction constitué essentiellement par plusieurs cylindres successifs, et de préférence quatre cylindres (1, 2, 3 et 4), qui permettent l'enduction d'une très faible quantité de résine sur le support.Figure 1 shows a schematic view of a device intended to carry out the method according to the invention. This device comprises on the one hand a station of coating consisting essentially of several successive cylinders, and preferably four cylinders (1, 2, 3 and 4), which allow the coating of a very low amount of resin on the support.
Cette unité d'enduction est suivie par une unité de contre-collage qui amène les deux éléments, c'est-à-dire la feuille de mica et le support, en contact, et qui exerce sur l'ensemble une action de pression et de température telle que décrite à la figure 2. Cette action de pression est effectuée à l'aide de deux cylindres (5 et 6). De préférence, un seul des deux cylindres sera chauffé.This coating unit is followed by a lamination unit which brings the two elements, i.e. the mica sheet and the support, in contact, and which exerts on the whole an action of pressure and temperature as described in figure 2. This action pressure is carried out using two cylinders (5 and 6). Preferably, only one of the two cylinders will be heated.
Les exemples qui suivent décrivent de manière plus spécifique deux exemples de réalisation du procédé selon la présente invention.The following examples describe more specific two examples of carrying out the process according to the present invention.
On réalise un ruban de mica par enduction à
chaud d'un support tissu de verre au moyen d'une résine
sans solvant et on contrecolle le support enduit sur un
papier mica. Pour cela, on utilise les matières suivantes :
Pour réaliser le ruban mica on procède comme suit:
Avec les réglages utilisés dans l'exemple, on obtient un dépôt de l'ordre de 4 à 5 g/m2 de résine époxy sur le tissu de verre, ce qui équivaut à une teneur de l'ordre de 2% en poids total du ruban. Si l'on tient compte de la résine préalablement mise en oeuvre dans le papier mica, on obtiendra un ruban fini présentant un taux de résine compris entre 3,5 et 4% en poids total du ruban.With the settings used in the example, a deposit of the order of 4 to 5 g / m 2 of epoxy resin is obtained on the glass fabric, which is equivalent to a content of the order of 2% by total weight. ribbon. If the resin previously used in the mica paper is taken into account, a finished ribbon will be obtained having a resin content of between 3.5 and 4% by total weight of the ribbon.
Si l'on observe au binoculaire ou au microscope un échantillon de tissu de verre enduit tel que décrit ci-dessus, on constate la présence de résine uniquement aux intersections entre les fils de chaíne et les fils de trame et plus précisément uniquement aux intersection où les fils de trame se superpose aux fils de chaíne, c'est-à-dire à une intersection sur 2 tel que décrit à la figure 3. On constate également qu'il n'y a pas de transfert de résine sur l'autre face du tissu de verre.If we observe in the binocular or in the microscope a sample of coated glass cloth such as described above, we see the presence of resin only at the intersections between the chain wires and weft threads and more precisely only intersection where the weft threads overlap the threads of chain, that is to say at an intersection on 2 such that described in Figure 3. We also see that there is no resin transfer on the other side of the glass fabric.
Les caractéristiques d'un ruban de mica ainsi réalisé (ruban A) sont reprises au tableau I et comparées à celles d'un ruban fabriqué par la technique classique dite de pistolage en milieu solvant (ruban B). On constate que le ruban A fabriqué suivant le procédé décrit ci-dessus contient une teneur en résine inférieure au taux normalement nécessaire pour un ruban B fabriqué par la technique classique de pistolage en milieu solvant. De plus, le ruban A présente une meilleure souplesse, une plus grande porosité et une meilleure résistance à la traction que le ruban B. Le ruban A est également totalement sec sur la face extérieur du tissu de verre étant donné que la résine se situe uniquement à l'interface entre le tissu de verre et le papier mica, cette caractéristique limite les risques de collage entre spires du ruban enroulé.The characteristics of a mica tape as well performed (ribbon A) are shown in Table I and compared with those of a ribbon made by the so-called classical technique spraying in solvent medium (ribbon B). We observe that ribbon A manufactured according to the process described above contains resin content below the rate normally required for a ribbon B manufactured by the classic spraying technique in solvent medium. Of more, tape A has better flexibility, more high porosity and better tensile strength than tape B. Tape A is also completely dry on the outside of the glass fabric since the resin is only located at the interface between the fabric of glass and mica paper, this characteristic limits the risks of sticking between turns of the wound ribbon.
On réalise un ruban de mica par enduction à chaud suivant
la même technique que décrite à l'exemple 1. Pour cela, on
utilise les matières suivantes :
Pour réaliser le ruban mica, on procède de la même façon que dans l'exemple 1 en remplaçant le tissu de verre par le film polyester. To make the mica tape, we proceed from the same as in Example 1 by replacing the fabric with glass by polyester film.
Avec les réglages utilisés dans l'exemple, on
obtient un dépôt de l'ordre de 4 g/m2 de résine époxyde sur
le film polyester. Le ruban mica ainsi réalisé est
extrêmement souple et l'adhésion entre le film polyester et
le papier mica est très bonne.
Claims (14)
- A method for making a micaceous product adapted for impregnation with a resin content ranging from 1 to 10% of the tape total weight, through the association of at least one support and one mica sheet, characterized in that:a solvent-free resin or a mixture of solvent-free resins is coated, said resin(s) having a melting point lower than the working temperature, on the support or on the mica sheet by means of several coating cylinders brought to a coating working temperature ranging from 40 to 200°C,the support is associated with the mica sheet, and they are subjected to a pressure and temperature treatment.
- A method according to claim 1, characterized in that the pressure and temperature treatment occurs between 40 and 200°C for a pressure ranging from 0 to 20 bar.
- A method according to claim 1 or 2, characterized in that an impregnating resin is incorporated, optionally in a solvent medium, into the mica sheet in a small amount, and this prior to the coating step.
- A method according to any one of the preceding claims, characterized in that the resin is a solvent-free resin of the silicone or epoxy type.
- A method according to claim 4, characterized in that the resin is a resin of the bisphenol A diglycidyl ether type.
- A method according to any one of the preceding claims, characterized in that an accelerator is incorporated into the coating resin.
- A method according to any one of the preceding claims, characterized in that an accelerator is incorporated into the mica sheet.
- A method according to any one of the preceding claims, characterized in that an accelerator is incorporated into the support.
- A method according to any one of the preceding claims, characterized in that the accelerator is a nitrogenous compound, an organometallic compound.
- A method according to any one of the preceding claims, characterized in that the support may be a film, a fabric or felt.
- A method according to any one of the preceding claims, characterized in that the mica sheet is a mica paper.
- A method according to any one of the preceding claims, characterized in that the mica sheet is made from calcined or non-calcined muscovite, phlogopite, vermiculite or synthetic mica, or a combination thereof.
- A micaceous product adapted for impregnation comprising a support coated with a solvent-free resin associated with a mica sheet, obtained by using the method according to any one of the preceding claims, characterized in that the resin content ranges from 1 to 10%, the support being a fabric on which the resin deposits appear essentially on the weft yarns at the intersection with the warp yarns.
- A micaceous product according to claim 13, being present in the form of a mica tape.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99928915A EP1086470B1 (en) | 1998-06-17 | 1999-06-17 | Method for making a micaceous product preferably in the form of a mica tape and resulting product |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98870136A EP0966001A1 (en) | 1998-06-17 | 1998-06-17 | Manufacture of a mica tape and obtained product |
EP98870136 | 1998-06-17 | ||
EP99928915A EP1086470B1 (en) | 1998-06-17 | 1999-06-17 | Method for making a micaceous product preferably in the form of a mica tape and resulting product |
PCT/BE1999/000077 WO1999066515A1 (en) | 1998-06-17 | 1999-06-17 | Method for making a micaceous product preferably in the form of a mica ribbon and resulting product |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1086470A1 EP1086470A1 (en) | 2001-03-28 |
EP1086470B1 true EP1086470B1 (en) | 2003-02-12 |
Family
ID=8237058
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98870136A Withdrawn EP0966001A1 (en) | 1998-06-17 | 1998-06-17 | Manufacture of a mica tape and obtained product |
EP99928915A Revoked EP1086470B1 (en) | 1998-06-17 | 1999-06-17 | Method for making a micaceous product preferably in the form of a mica tape and resulting product |
Family Applications Before (1)
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EP98870136A Withdrawn EP0966001A1 (en) | 1998-06-17 | 1998-06-17 | Manufacture of a mica tape and obtained product |
Country Status (9)
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US (1) | US6699804B1 (en) |
EP (2) | EP0966001A1 (en) |
JP (1) | JP2002518220A (en) |
CN (1) | CN1145977C (en) |
AT (1) | ATE232644T1 (en) |
AU (1) | AU4593399A (en) |
BR (1) | BR9911853A (en) |
DE (1) | DE69905362T2 (en) |
WO (1) | WO1999066515A1 (en) |
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US9676168B2 (en) | 2010-11-19 | 2017-06-13 | Lamart Corporation | Fire barrier layer and fire barrier film laminate |
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CN1324615C (en) * | 2002-07-04 | 2007-07-04 | 株式会社东芝 | High thermal conductivity insulating member and its manufacturing method, electromagnetic coil, and electromagnetic device |
US7524557B2 (en) | 2002-07-04 | 2009-04-28 | Kabushiki Kaisha Toshiba | Highly heat conductive insulating member, method of manufacturing the same and electromagnetic device |
JP4996086B2 (en) * | 2005-09-29 | 2012-08-08 | 株式会社東芝 | Mica tape and rotating electric coil using this mica tape |
US20080026180A1 (en) * | 2006-07-26 | 2008-01-31 | Bush Robert L | Impregnated inorganic paper and method for manufacturing the impregnated inorganic paper |
US20120128959A1 (en) | 2010-11-19 | 2012-05-24 | Fernando Joseph A | Fire barrier layer and fire barrier film laminate |
US8568855B2 (en) * | 2011-06-08 | 2013-10-29 | Siemens Energy, Inc. | Insulation materials having apertures formed therein |
DE102011079489A1 (en) * | 2011-07-20 | 2013-01-24 | Siemens Aktiengesellschaft | Method for producing a strip for an electrical insulation system |
DE102011083228A1 (en) * | 2011-09-22 | 2013-03-28 | Siemens Aktiengesellschaft | Insulating systems with improved partial discharge resistance, process for the preparation thereof |
CN103700456B (en) * | 2014-01-02 | 2016-06-29 | 株洲时代电气绝缘有限责任公司 | A kind of mica tape production method not using organic solvent |
CN104532685A (en) * | 2014-11-24 | 2015-04-22 | 泉州泉港华博化工科技有限公司 | Preparation method of high-insulation mica paper |
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DE1665865B2 (en) * | 1967-02-07 | 1971-11-25 | Siemens AG, 1000 Berlin u. 8000 München | HIGH VOLTAGE RESISTANT INSULATING MATERIAL |
FR1199942A (en) * | 1970-10-21 | 1959-12-17 | Escher Wyss Soc | Device for sealing a machine in which a motive fluid which is susceptible to radioactive contamination circulates |
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US4606785A (en) * | 1984-11-15 | 1986-08-19 | Westinghouse Electric Corp. | Simplified method of making high strength resin bonded mica tape |
FR2591793B1 (en) * | 1985-12-13 | 1988-08-12 | Alsthom | ELECTRICALLY INSULATING AND FIRE-RESISTANT MICACE TAPE, ESPECIALLY FOR ELECTRIC OR FIBER OPTIC CABLE |
US4661397A (en) * | 1986-03-07 | 1987-04-28 | Westinghouse Electric Corp. | Polybutadiene bonded extremely flexible porous mica tape |
US5256288A (en) * | 1992-08-28 | 1993-10-26 | Cer-Wat, Inc. | Filtration medium including substrate-supported porous membrane and method for the manufacture thereof |
DE4244298C2 (en) * | 1992-12-28 | 2003-02-27 | Alstom | Electrical tape and process for its manufacture |
JP3046905B2 (en) * | 1993-11-26 | 2000-05-29 | 三菱電機株式会社 | Pre-preg for electrical insulation |
US5618891A (en) * | 1995-03-29 | 1997-04-08 | General Electric Co. | Solventless resin composition having minimal reactivity at room temperature |
US5912067A (en) * | 1997-03-18 | 1999-06-15 | Astral International S.A. | Fabric particularly for mattresses and covers |
US5787602A (en) * | 1997-03-31 | 1998-08-04 | Wangner Systems Corporation | Dryer fabric with adhesive tacky surface for web |
-
1998
- 1998-06-17 EP EP98870136A patent/EP0966001A1/en not_active Withdrawn
-
1999
- 1999-06-17 DE DE69905362T patent/DE69905362T2/en not_active Revoked
- 1999-06-17 EP EP99928915A patent/EP1086470B1/en not_active Revoked
- 1999-06-17 US US09/719,917 patent/US6699804B1/en not_active Expired - Lifetime
- 1999-06-17 BR BR9911853-0A patent/BR9911853A/en not_active Application Discontinuation
- 1999-06-17 CN CNB998074292A patent/CN1145977C/en not_active Expired - Fee Related
- 1999-06-17 AT AT99928915T patent/ATE232644T1/en not_active IP Right Cessation
- 1999-06-17 JP JP2000555260A patent/JP2002518220A/en active Pending
- 1999-06-17 WO PCT/BE1999/000077 patent/WO1999066515A1/en not_active Application Discontinuation
- 1999-06-17 AU AU45933/99A patent/AU4593399A/en not_active Abandoned
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9676168B2 (en) | 2010-11-19 | 2017-06-13 | Lamart Corporation | Fire barrier layer and fire barrier film laminate |
US9708052B2 (en) | 2010-11-19 | 2017-07-18 | Unifrax I Llc | Fire barrier layer and fire barrier film laminate |
US9919790B2 (en) | 2010-11-19 | 2018-03-20 | Unifrax I Llc | Fire barrier layer and fire barrier film laminate |
Also Published As
Publication number | Publication date |
---|---|
US6699804B1 (en) | 2004-03-02 |
WO1999066515A1 (en) | 1999-12-23 |
CN1305632A (en) | 2001-07-25 |
DE69905362T2 (en) | 2003-12-11 |
BR9911853A (en) | 2001-03-20 |
ATE232644T1 (en) | 2003-02-15 |
EP1086470A1 (en) | 2001-03-28 |
CN1145977C (en) | 2004-04-14 |
AU4593399A (en) | 2000-01-05 |
DE69905362D1 (en) | 2003-03-20 |
EP0966001A1 (en) | 1999-12-22 |
JP2002518220A (en) | 2002-06-25 |
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