Classifications

• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/001—Combinations of extrusion moulding with other shaping operations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/001—Combinations of extrusion moulding with other shaping operations
  • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/001—Combinations of extrusion moulding with other shaping operations
  • B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/04—Particle-shaped
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
  • B29C48/07—Flat, e.g. panels
  • B29C48/08—Flat, e.g. panels flexible, e.g. films
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
  • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
  • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
  • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
  • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
  • B29L2031/3412—Insulators

Definitions

• the invention relates to a method for producing a film which is suitable as an electrical insulation material and which has a thin layer which consists at least essentially of a curable synthetic resin mixture and mica, and to the use of the film.
• these surface insulation materials are now in tape form or as wide goods e.g. applied to the conductor bar to be insulated and then brought into its final shape in a heated coil press and the insulation hardened in the process.
• the fine mica paper is produced from a mica that has been digested in a suitable manner. Then the carrier material and the fine mica paper with the synthetic resin acted upon and finally joined together by calendering.
• the invention is based on the object of specifying a new process for producing a film suitable as an electrical insulating material which, like the known surface insulating materials mentioned above, contains a curable synthetic resin mixture and mica, but the new production process is considerably less complex than the known one mentioned Production method.
• the object on which the invention is based is achieved in the process according to the invention, which is characterized in that a paste-like strand is continuously formed from the hardenable synthetic resin mixture and mica powder, advantageously electro-mica powder, which thin into a calender or a belt press while reducing the strand thickness Layer is transferred.
• the electro-mica powder used is advantageously one based on muscovite or phlogopite.
• the pasty strand contains 35 to 70% by weight, but advantageously 45 to 65% by weight of mica powder.
• the pasty strand contains up to 20% by weight of further fillers and / or reinforcing materials in addition to the mica powder.
• a mixture is first produced to form the pasty strand from the synthetic resin mixture and the fillers and / or reinforcing materials, which mixture is conveyed in the extruder in the direction of the extruder nozzle and into the inside of the Extruder is mixed with a hardener component.
• the mixture of the synthetic resin and the fillers and / or reinforcing materials is advantageously produced in the extruder itself.
• the synthetic resin is used in the liquid and / or solvent-free state in the production of the pasty strand.
• the curable synthetic resin mixture used is one based on epoxy resin or polyester resin or silicone resin.
• the pasty strand becomes the calendering gap or the gap of the belt press between two tapering ends
• the band-shaped layer produced in the calender or the belt press from the pasty strand is advantageously permanently connected to at least one of the incoming webs of flat material, or the calender gap or the gap of the band press between the pasty strand and one of the webs of flat material is advantageously guided additionally a fiber fabric web, which is permanently bonded to the band-shaped layer produced from the pasty strand in the calender or the belt press.
• the invention also includes the film itself produced by the process according to the invention. It also includes the use of this film for the electrical insulation of coils of electrical machines, the synthetic resin mixture contained in the film being cured. Description of the drawing
• the central part of the system is a heatable twin-screw extruder 1 on which only one of the two extruder screws 2 can be seen in the drawing.
• the extruder housing has a feed hopper 4 at a first feed point 3, in which 5 mica powder 6 can be metered in from a storage container 5 by means of a metering spiral 7.
• the feed point 3 is also connected via a pipe 8 and a metering pump 9 to a heatable reservoir 10 for the synthetic resin.
• a second feed point 12 which is offset in the extruder conveying direction 11 with respect to the first feed point 3 is connected via the pipeline 13 and a metering pump 14 to a storage vessel 15 for the hardener solution.
• the extruder 1 has a nozzle 16 for extruding a round strand and can be pivoted in the direction perpendicular to the plane of the drawing at the location of the nozzle 16, as indicated by 17.
• a calender is connected downstream of the extruder, with a pair of heatable calender rolls 18, which include a calender nip 19, and with a take-off device for the strip-like process product 20 with two deflection rollers 21 and 22, a pair of take-off rolls 23 and a winding device 24.
• the calender also includes unwinding devices 25 to 27, of which separating films 28 and a glass fiber fabric 29 are fed to the calender nip 19 each in tape form.
• the following starting materials are used for the production of a strip-shaped surface insulating material of a thickness of approximately 0.2 mm, consisting of a layer containing a thermosetting epoxy resin and mica powder, which is connected on one surface side to a glass fiber fabric web.
• a mica powder based on muscovite in which about 50% by weight has a grain size between 0.08 and 0.10 mm and 50% by weight has a grain size between 1.5 and 1.8 mm and which is provided in the storage container 5.
• An epoxy resin 30 consisting of 7 parts by weight of a resin component with an epoxy equivalent of 200 and 3 parts by weight of a component with epoxy equivalent of 420, where 10 melted in the epoxy resin in the heated storage vessel.
• a so-called reactive diluent such as diphenylglycidyl ether, butanediol diglycidyl ether or preferably also a low-viscosity cycloaliphatic epoxy resin
• extruder 1 a pasty strand consisting of a mixture of the mica powder, the epoxy resin and the hardener (solids content) in a ratio of 58: 41: 1 parts by weight is produced.
• the hardener solution 31 is metered into the epoxy resin / mica powder mixture, so that the extruder screws 2 convey a uniform mica powder / epoxy resin / hardener solution mixture at the nozzle 16.
• the temperature of the mixture in the extruder is maintained at approximately 100 ° C.
• the material of the pasty strand 33 continuously emerging from the nozzle 16 is fed to the calender gap 19 in a uniformly distributed manner over its entire width.
• the pasty strand 33 is fed into the calender nip between two separating foils 28 tapering from the unwinding devices 25 and 27.
• the unrolling device 26 feeds the glass fiber web 29 between one of the separating foils 28 and the pasty strand 33 to be converted into a band-shaped layer in the calender.
• the material of the pasty strand 33 is continuously transferred into a thin layer, which permanently connects to the incoming glass fiber web 29.
• the platelet-shaped particles of the mica powder are advantageously aligned largely parallel to the layer plane.
• the composite material 20 emerging from the calender nip is now over the deflection rollers 21 and 22 with the help of the Ab pull roller pair 23 deducted and finally rolled up at 24.
• the separating film 28 lying against the glass fiber web 29 is then removed from the composite material 20 in a special prewrapping device, after which the material is ready for use as a surface insulating material, if necessary after cutting into narrower winding tapes.
• the temperature control in the treatment of the mica powder - epoxy resin hard mixture during the process described is such that the synthetic resin is converted into the B state, but the latent amiric hardener is not yet activated.
• the thin layer produced from the mica powder-epoxy resin hardener mixture in the calender can also be connected to other flat materials, in particular carrier materials such as plastic rolls, synthetic fiber fabrics and the like.
• fillers and / or reinforcing materials can also be added to the mica powder / resin mixture.
• Such substances can e.g. Quartz powder and / or plastic fibers.
• the method described can also be used very advantageously in general for the production of films which, in addition to a curable synthetic resin mixture, instead of the mica powder or a part thereof, other fillers and / or reinforcing materials, such as, for example, Soot, iron powder, reinforcing fibers and the like.
• the method according to the invention breaks completely new ground in the production of surface insulating materials based on fine mica, which are used in particular for the electrical insulation of coils of electrical machines.
• the high process complexity involved in the production of the mica papers previously used is avoided.
• the disposal problems associated with the production and impregnation of the mica paper are also avoided.
• the mechanical engineering effort required to carry out the method according to the invention is particularly low.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Inorganic Chemistry (AREA)
• Insulating Bodies (AREA)
• Glass Compositions (AREA)
• Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Laminated Bodies (AREA)
• Organic Insulating Materials (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Manufacturing Of Electric Cables (AREA)
• Casting Or Compression Moulding Of Plastics Or The Like (AREA)
• Moulding By Coating Moulds (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (1)

Family

ID=3541873

Family Applications (1)

Country Status (10)

Cited By (2)

Families Citing this family (1)

Citations (9)

Family Cites Families (7)

• 1982
  • 1982-07-27 AT AT0288782A patent/AT387356B/de not_active IP Right Cessation
• 1983
  • 1983-07-22 EP EP83902232A patent/EP0113741B1/de not_active Expired
  • 1983-07-22 AU AU17745/83A patent/AU565559B2/en not_active Ceased
  • 1983-07-22 JP JP58502405A patent/JPS60500048A/ja active Pending
  • 1983-07-22 DE DE8383902232T patent/DE3368223D1/de not_active Expired
  • 1983-07-22 WO PCT/AT1983/000022 patent/WO1984000515A1/de active IP Right Grant
  • 1983-07-22 AT AT83902232T patent/ATE24145T1/de not_active IP Right Cessation
  • 1983-07-25 IT IT22223/83A patent/IT1163849B/it active
  • 1983-07-26 ZA ZA835471A patent/ZA835471B/xx unknown
  • 1983-07-27 CA CA000433321A patent/CA1199768A/en not_active Expired
• 1984
  • 1984-01-30 IN IN28/BOM/84A patent/IN158759B/en unknown

Patent Citations (9)

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