EP0656034A1 - Resine phenolique de moulage sans amiante, plastifiable, a base de resol - Google Patents

Resine phenolique de moulage sans amiante, plastifiable, a base de resol

Info

Publication number
EP0656034A1
EP0656034A1 EP94916138A EP94916138A EP0656034A1 EP 0656034 A1 EP0656034 A1 EP 0656034A1 EP 94916138 A EP94916138 A EP 94916138A EP 94916138 A EP94916138 A EP 94916138A EP 0656034 A1 EP0656034 A1 EP 0656034A1
Authority
EP
European Patent Office
Prior art keywords
molding composition
resin
composition according
mixture
molding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP94916138A
Other languages
German (de)
English (en)
Inventor
Werner Baun
Ursula Glatz
Frank Ludwig
Thomas Moser
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0656034A1 publication Critical patent/EP0656034A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/14—Fastenings of commutators or slip-rings to shafts

Definitions

  • the invention relates to glass fiber reinforced phenolic resin molding compositions, in particular for collectors and commutators of electric motors in accordance with the preamble of the main claim.
  • DE 38 38 106 discloses glass fiber reinforced molding compounds with phenolic resins and a filler content of 5 to 10 percent by weight of mica particles which have a non-porous, heat crack resistant molding compound. Harmful asbestos fibers as fillers were avoided.
  • the mica content can be set as the only parameter for setting the property profile of the molding composition.
  • Grains of dust with an amount of up to 15 percent by weight of the molding composition inevitably form as undesirable by-products, which means that filters have to be used, which have to be changed frequently.
  • a disadvantage of the preparation in the fluid mixer is that with high filler proportions of the molding material that no granules but woolly products, with low filler proportions that undefined conglomerates are formed as products.
  • the object of the invention is to produce a plasticizable, asbestos-free molding compound based on phenolic resins, especially liquid resole resins and resole resin with cashew nut oil resin and resole resin with novolak resins in a fluid mixer, which fulfill the above-mentioned property profile for the production of collectors for electric motors.
  • the preparation of the molding composition in accordance with the recipes of the invention in a fluid mixer provides granules with a narrow particle size distribution without oversize with good plasticizability.
  • Resol resin-based phenoplasts of this type have a limited shelf life, but have very advantageous adhesion properties compared to known metals and metal alloys.
  • Good adhesion to copper components, such as collectors of electric motors, is achieved with good moldability in the manufacturing process.
  • the molding compounds are well absorbed in the plasticizer and do not splice during extrusion, which results in a homogeneously compacted preform.
  • the measures and procedural details listed in the subclaims enable improvements to be achieved compared to the general features given in the main claim. It is possible to achieve homogeneous mixing and reliable impregnation of the molding composition, in particular of its fibers, during the production of the molding composition.
  • the mechanical stability can be adjust the ratio of the long-fiber to the short-fiber portions as well as the type and amount of mineral fillers and the respective proportions of all of these substances in the total mass of the molding composition.
  • the very short mixing times correspond to the requirements of modern, automated production and enable the production of an advantageously granulated, fine-grained molding compound which can be plasticized and pressed and which supplies preliminary products, for example tablets, as a starting basis for the production of electrical engineering end products.
  • Suitable resol resins and novolak resins are commercially available.
  • the mass ratio of the resin components for resol resin: cashew nut oil resin, resol resin: novolak resin can be varied within limits.
  • the proportion of the resin component, or a corresponding mixture of the phenolic resin components, in the total mass of the molding composition is a minimum of 20 to a maximum of 35 percent by weight.
  • Advantageously used release agents are stearates, in particular zinc and calcium stearate, their mixtures or chemically related stearates in a proportion of 0.3 to 3.5 percent by weight based on the total mass of the molding composition.
  • Oxide of divalent cations in particular the alkaline earth oxides MgO, CaO, SrO, BaO with a proportion of 0.1 to 0.5 percent by weight, based on the total mass of the molding composition, are suitable as accelerators.
  • glass fibers fiber lengths according to Tables 1 and 2 given below were used.
  • the glass fibers are commercially available from conventional silicate glass, in particular E-glass in various fiber lengths of, for example, 3, 4.5, 6, 12 and 30 millimeters available.
  • molding compositions with the desired property profile by means of short glass fibers, for example predominantly 0.5 millimeter fiber length.
  • short glass fibers for example predominantly 0.5 millimeter fiber length.
  • polyacrylonitrile fibers or mixtures of glass fibers and polyacrylonitrile fibers The proportion of fibers in the total mass of the molding composition is preferably 20 to 35 percent by weight and a mass ratio of short fibers: long fibers of 4: 1 to 1: 0.
  • Chalk, leaf silicates, mica, wollastonite and aluminum hydroxide with 20 to 40 percent by weight of the total mass of the molding composition were used as fillers.
  • Aluminum oxide, rare earth oxides and mixtures thereof are also conceivable as fillers.
  • a mixture of 13 percent by weight of chalk and 20 percent by weight of leaf silicate fulfilled the property profile very well.
  • a mixture of 10 percent by weight of leaf silicate and 20 percent by weight of chalk made it possible to produce a granular product very well.
  • wood flour, cellulose, textile fibers, textile fabrics, veneer chips can be used as fillers.
  • the molding composition can also be colored by incorporating a coloring inorganic or organic substance as a pigment, color paste or solution.
  • the coloring matter is appropriate, added gege ⁇ in amounts between 0.1 to 2.5 percentspans ⁇ , based on the sum of the components of Formmassse lie.
  • the preparation process is carried out in a cylindrical container of a fluid mixer, in particular a heating / cooling mixer of open construction.
  • the release agent, the accelerator, the glass fibers, the fillers, and possibly the dye are weighed in the mixer and mixed.
  • Resole resin with up to 6% by weight cashew nut oil resin or resol resin with novolak resin are added with stirring.
  • Cashew nut oil is described in "Römpp Chemie ⁇ lexikon", Volume 1, 8th edition, 1985, page 614.
  • the mixing material introduced is mixed by the rotating, ring-shaped or wing-shaped tools of the mixer, thrown against the wall as a result of the centrifugal forces and pushed up.
  • the temperature of the mix is kept at 120 degrees Celsius, which is usually achieved by cooling the container.
  • the power consumption of the stirrer is recorded to record the change in the viscous properties of the mix.
  • the Resin impregnates the fillers with a sufficient mixing time, which is usually between 2 and 15 minutes, so that a homogeneous molding compound is obtained.
  • the energy consumption of the mixer changes due to a change in the viscous properties of the mix. If the required degree of condensation is reached, this is indicated by a threshold value of the stirrer output.
  • the molding compound is drained into the cooling mixer in order to stop further condensation of the molding compound.
  • a homogeneous, fine-grained granulate is obtained which, in contrast to ground molding compositions according to the prior art, has only a few dust particles.
  • the absence of dust is checked by a sieve test of the molding compound.
  • the mass of oversize can also be determined and, if necessary, eliminated in a further process step.
  • the average grain diameter of the intermediate granules is 1 to 5 millimeters.
  • a grain size of 0.7 millimeters or smaller is defined as dust that is screened out.
  • the molding composition contains a maximum of up to 5 percent by weight, preferably less than 3 percent by weight, of dust. These molding compounds are very free-flowing.
  • a molding compound which corresponds to the material composition of the invention can also be prepared using roller mills or kneaders, although the grinding and the dust which results from this must be accepted.
  • Resins 22 22 27 Cashew nut oil Cashew nut oil Cashew nut oil 6 6 6

Landscapes

  • Compositions Of Macromolecular Compounds (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne une matière de moulage, utilisée notamment pour produire des collecteurs de machines électriques, qui comprend du résol ou des mélanges de résols et des mélanges de charges et de fibres de verre. Cette matière de moulage contient selon l'invention entre 20 et 50 % en poids de charges et approximativement 30 % en poids de fibres de verre. Cette composition et sa préparation dans le mélangeur fluidique permettent d'obtenir un intermédiaire granulé à grain fin, sans poussière. Pour produire la matière de moulage, les matières premières sont placées dans un mélangeur à turbine et on ajoute un mélange contenant entre 20 et 30 % en poids de résol et entre 1 et 6 % en poids de résine à base d'huile de noix de cajou.
EP94916138A 1993-06-18 1994-05-26 Resine phenolique de moulage sans amiante, plastifiable, a base de resol Ceased EP0656034A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19934320209 DE4320209A1 (de) 1993-06-18 1993-06-18 Plastifizierbare asbestfreie Phenolharzformmasse auf Resolharzbasis
DE4320209 1993-06-18
PCT/DE1994/000604 WO1995000584A1 (fr) 1993-06-18 1994-05-26 Resine phenolique de moulage sans amiante, plastifiable, a base de resol

Publications (1)

Publication Number Publication Date
EP0656034A1 true EP0656034A1 (fr) 1995-06-07

Family

ID=6490621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94916138A Ceased EP0656034A1 (fr) 1993-06-18 1994-05-26 Resine phenolique de moulage sans amiante, plastifiable, a base de resol

Country Status (4)

Country Link
EP (1) EP0656034A1 (fr)
JP (1) JPH08500390A (fr)
DE (1) DE4320209A1 (fr)
WO (1) WO1995000584A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59712066D1 (de) * 1997-08-29 2004-12-09 Bakelite Ag Verfahren zur Herstellung von duroplastischen Formmassen
DE10126713A1 (de) * 2001-05-31 2002-12-05 Bakelite Ag Silikatisch abbindende Formmassen und daraus hergestellte Formkörper
CN108979004A (zh) * 2017-05-31 2018-12-11 江苏海川新材料科技有限公司 一种环型玻璃钢筋材

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4233203A (en) * 1977-12-22 1980-11-11 Hooker Chemicals & Plastics Corp. Moldable thermosetting phenol-aldehyde resin compositions and process for making the compositions
US4178278A (en) * 1978-03-01 1979-12-11 Johns-Manville Corporation Friction material for railroad service
US4388423A (en) * 1981-11-02 1983-06-14 Glennco Trust Friction lining material
JPH01122339A (ja) * 1987-11-05 1989-05-15 Mitsubishi Electric Corp 始動電動機のコンミテータ
JPH0292952A (ja) * 1988-09-29 1990-04-03 Unitika Ltd フエノール樹脂成形材料組成物
JPH06166742A (ja) * 1992-12-02 1994-06-14 Sumitomo Chem Co Ltd エポキシ樹脂組成物

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9500584A1 *

Also Published As

Publication number Publication date
WO1995000584A1 (fr) 1995-01-05
DE4320209A1 (de) 1994-12-22
JPH08500390A (ja) 1996-01-16

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