US3546017A - Electrodeposition of particulate coating material - Google Patents

Electrodeposition of particulate coating material Download PDF

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Publication number
US3546017A
US3546017A US681198A US3546017DA US3546017A US 3546017 A US3546017 A US 3546017A US 681198 A US681198 A US 681198A US 3546017D A US3546017D A US 3546017DA US 3546017 A US3546017 A US 3546017A
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US
United States
Prior art keywords
particles
coating
barium titanate
conductor
dielectric
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US681198A
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English (en)
Inventor
Wesley W Pendleton
William W Ulmer
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Atlantic Richfield Co
Original Assignee
Anaconda Wire and Cable Co
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Publication date
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Assigned to ATLANTIC RICHFIELD COMPANY, A PA CORP. reassignment ATLANTIC RICHFIELD COMPANY, A PA CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ANACONDA COMPANY THE, A DE CORP
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0033—Apparatus or processes specially adapted for manufacturing conductors or cables by electrostatic coating
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S524/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S524/901—Electrodepositable compositions

Definitions

  • This invention relates to the coating of surfaces and particularly to the continuous coating of elongated conductors by electrostatic deposition.
  • application Ser. No. 588,511, now patent 3,396,699 an improvement is described in apparatus for electrostatically coating a continuous conductor passing through a cloud of particles above a fluid bed, and coating apparatus is commercially available in several varieties that operate on principles of electrostatics.
  • an electrical potential usually in the range of 30,000-l00,0 ⁇ 00 volts, is impressed between the object to be coated and an electrode spaced from the object.
  • the coating particles are introduced between the electrode and the object and may become charged either by contact with the electrode, other charged particles, or the ionized air.
  • Our invention comprises also the powdered mixture, for deposition, of particles of a coating material, and a small weight percentage of a substance, such as barium titanate, with a dielectric constant in excess of 1500.
  • a substance such as barium titanate
  • the barium titanate or other high-dielectric-constant substance is preferably substantially finer than the coating material.
  • the coating material of our mixture comprises an organic resin such as an epoxy.
  • FIG. 1 represents a container of the mixture of our invention with the particle sizes very much enlarged.
  • FIG. 2 shows a scheme of the process of our invention.
  • a mixture indicated generally by the numeral 10, has been prepared for coating the surface of an object such as an electrical Wire strip that is passed continuously adjacent to an electrostatically charged supply of said particles.
  • This mixture comprises a large plurality of particles 11 of an epoxy resin of a type known for electrical insulation coating or the constituents of such a resin.
  • a suitable epoxy resin comprises about 77.31 parts of Epi Rez #530 C, f9.59 parts Epi Rez #540, .23 part of hexarnethylene tetramine, 10.5 parts of trimellitic anhydride and .87 part of powdered silica (Cab-o-Sil, supplied by Godfrey L. Cabot, Inc.).
  • Epi Rez is supplied by the Celanese Plastics Company.
  • other resins suitable for electrodeposition may be used, of which polyolens, polyesters, polyacrylics, polyvinyls, polyamids, polyimids are listed by way of example.
  • the dielectric constant of these materials is preferably lower than 4 and invariably lower than 10.
  • Inorganic glasses and ceramics or blends thereof, that will be fused on a coated object can also comprise the particles 11 within the scope of our invention as can pigment particles which are known for use in the practice of xerography.
  • the epoxy particles 11 had the following mesh analyses-on mesh, 9.2%; on 200 mesh, 28.9%; on 230 mesh, 23.6%; on 270 mesh, 13.4%; on 325 mesh, 13.2%; on 400 mesh, 6.7%; through 400 mesh, 5%.
  • mesh analyses-on mesh 9.2%; on 200 mesh, 28.9%; on 230 mesh, 23.6%; on 270 mesh, 13.4%; on 325 mesh, 13.2%; on 400 mesh, 6.7%; through 400 mesh, 5%.
  • Interspersed uniformly among the particles 11 are particles 12 of barium titanate to the amount of about 1% of the Weight of the particles 11.
  • Barium titanate has a dielectric constant at room temperature of 1740 and a low dissipation factor (0.63%) which is advantageous in an electrical insulation.
  • the particle size of the barium titanate should be much iiner than the size of the particles 11 and all of it is passed through 400 mesh. Consequently, although the weight of the barium titanate added is relatively small the number of particles in the blend are sufficient to effect its behavior in an electric eld. It is preferred to have the high-dielectric-constant powder in a particle size from .01 to .05 mil.
  • the BaTiO3 be from 0.5-1.5% of the Weight of the particles 11 but weights from .1 to 5% may be used with advantageous effect depending on the relative particle sizes and selection of high-dielectric-constant material.
  • high-dielectric-constant materials that can be used in the practice of our invention include combinations of barium titanate and strontium titanate of which the compound with a barium:strontium ratio of 79:21 has a dielectric constant of 8700, that with a barium:strontium ratio of 71:29 has a dielectric constant of 2990 and that with a barium:strontium ratio of 90:10 has a dielectric constant of 1310.
  • the dissipation factor of the 79:21 barium strontium compound is high, 2.30%, but, because the quantity of the compound that will finally be fused into the insulation is low, the high dissipation factor will not be objectionable for many electrical insulation applications, and of course, will be no hindrance at all for nonelectrical coatings.
  • Ferrites are known with dielectric constants as high as 680,000 and these too are useful in the practice of our invention although their cost, at present, is high for many commercial applications.
  • a reel of rectangular magnet wire conductor 13, grounded at 14 is continuously advanced through a cloud 16 of electrostatically charged particles maintained by known methods around the conductor.
  • a suitable method employs a uid bed as hereinabove cited.
  • a high potential is maintained on a plate 17 by means of a transformerrectifier 18 or other suitable means in a known manner. Instead of the plate 17 the high potential might be applied to the nozzle of a powder spray unit of which several types are commercially available.
  • the cloud 16 is supplied from a mixer 19 which may also advantageously comprise a pulverizer, into which are paid the coating particles 21 CTI ' prise barium titanate.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US681198A 1967-11-07 1967-11-07 Electrodeposition of particulate coating material Expired - Lifetime US3546017A (en)

Applications Claiming Priority (1)

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US68119867A 1967-11-07 1967-11-07

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FR (1) FR1574585A (show.php)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770482A (en) * 1971-01-18 1973-11-06 Beatrice Foods Co Electrostatic coating method of applying multilayer coating
US4025660A (en) * 1976-01-21 1977-05-24 W. R. Grace & Co. Method of masking, venting and coating the inside of a receptacle
US4100002A (en) * 1975-04-01 1978-07-11 Northern Telecom Limited Method for producing powder filled cable
US4109027A (en) * 1976-01-21 1978-08-22 W. R. Grace & Co. Electrostatic coating apparatus and method
US4131690A (en) * 1975-05-05 1978-12-26 Northern Electric Company Limited Method of powder coating an insulated electrical conductor
US4277389A (en) * 1979-11-05 1981-07-07 The Polymer Corporation X ray scattering device
EP0041824A1 (en) * 1980-06-11 1981-12-16 Associated Electrical Industries Limited A method of manufacturing electrical insulation
US4503284A (en) * 1983-11-09 1985-03-05 Essex Group, Inc. RF Suppressing magnet wire
US4605574A (en) * 1981-09-14 1986-08-12 Takashi Yonehara Method and apparatus for forming an extremely thin film on the surface of an object
US20140109716A1 (en) * 2012-10-22 2014-04-24 Shimano Inc. Bicycle control cable

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2556122B1 (fr) * 1983-12-05 1986-09-12 Cables De Lyon Geoffroy Delore Procede de fabrication d'un isolant a structure cellulaire autoreticulable

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2919247A (en) * 1954-12-23 1959-12-29 Haloid Xerox Inc Tripartite developer for electrostatic images
US3203821A (en) * 1961-05-25 1965-08-31 Plate Gmbh Dr Flocks for the production of velvet-like or plush-like materials and process for theproduction of such materials by electrostatic means
US3239465A (en) * 1958-05-12 1966-03-08 Xerox Corp Xerographic developer
US3342621A (en) * 1962-08-03 1967-09-19 Sames Sa De Machines Electrost Electrostatic precipitation process

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2919247A (en) * 1954-12-23 1959-12-29 Haloid Xerox Inc Tripartite developer for electrostatic images
US3239465A (en) * 1958-05-12 1966-03-08 Xerox Corp Xerographic developer
US3203821A (en) * 1961-05-25 1965-08-31 Plate Gmbh Dr Flocks for the production of velvet-like or plush-like materials and process for theproduction of such materials by electrostatic means
US3342621A (en) * 1962-08-03 1967-09-19 Sames Sa De Machines Electrost Electrostatic precipitation process

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770482A (en) * 1971-01-18 1973-11-06 Beatrice Foods Co Electrostatic coating method of applying multilayer coating
US4100002A (en) * 1975-04-01 1978-07-11 Northern Telecom Limited Method for producing powder filled cable
US4131690A (en) * 1975-05-05 1978-12-26 Northern Electric Company Limited Method of powder coating an insulated electrical conductor
US4025660A (en) * 1976-01-21 1977-05-24 W. R. Grace & Co. Method of masking, venting and coating the inside of a receptacle
US4109027A (en) * 1976-01-21 1978-08-22 W. R. Grace & Co. Electrostatic coating apparatus and method
US4277389A (en) * 1979-11-05 1981-07-07 The Polymer Corporation X ray scattering device
EP0041824A1 (en) * 1980-06-11 1981-12-16 Associated Electrical Industries Limited A method of manufacturing electrical insulation
US4605574A (en) * 1981-09-14 1986-08-12 Takashi Yonehara Method and apparatus for forming an extremely thin film on the surface of an object
US4503284A (en) * 1983-11-09 1985-03-05 Essex Group, Inc. RF Suppressing magnet wire
US20140109716A1 (en) * 2012-10-22 2014-04-24 Shimano Inc. Bicycle control cable

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Publication number Publication date
FR1574585A (show.php) 1969-07-11

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AS Assignment

Owner name: ATLANTIC RICHFIELD COMPANY, A PA CORP.

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ANACONDA COMPANY THE, A DE CORP;REEL/FRAME:003992/0218

Effective date: 19820115