EP0549728B1 - Kunststoffartikel mit elektrostatischer beschichtung - Google Patents

Kunststoffartikel mit elektrostatischer beschichtung Download PDF

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Publication number
EP0549728B1
EP0549728B1 EP91919322A EP91919322A EP0549728B1 EP 0549728 B1 EP0549728 B1 EP 0549728B1 EP 91919322 A EP91919322 A EP 91919322A EP 91919322 A EP91919322 A EP 91919322A EP 0549728 B1 EP0549728 B1 EP 0549728B1
Authority
EP
European Patent Office
Prior art keywords
article
fibres
fibrous web
plastics
web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91919322A
Other languages
English (en)
French (fr)
Other versions
EP0549728A1 (de
Inventor
Adam Paul Geel
Rudolf Gijsbertus Goossens
Dirk Albertus Bovenschen
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.)
Lantor BV
Original Assignee
Lantor BV
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 Lantor BV filed Critical Lantor BV
Publication of EP0549728A1 publication Critical patent/EP0549728A1/de
Application granted granted Critical
Publication of EP0549728B1 publication Critical patent/EP0549728B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2201/00—Polymeric substrate or laminate
    • B05D2201/02—Polymeric substrate

Definitions

  • This invention relates to a plastics article provided with an electrostatically applied coating, more particularly a muffle coating, and to a process for manufacturing such articles.
  • Plastics are also used increasingly in the manufacture of housings for various machines.
  • One of the ongoing problems associated with the use of plastics is finishing the surface, in particular if this is to be done through a coating.
  • Muffling further involves the problem of poor conductivity of the plastics, so that electrostatic coating, which is most desirable from an environmental point of view, is not properly possible, if at all.
  • metal powder, fibres, or a fibrous web are provided in an article to provide for electromagnetic shielding.
  • the object of the present invention is to provide a system in which the cited disadvantages are not encountered.
  • This invention accordingly relates to an article manufactured from a plastics material in which article an electrically conducting fibrous web has been arranged at or below at least one of the surfaces thereof, provided with an electrostatically applied coating, particularly a muffle coating.
  • the fibrous web used in the article is preferably a web of metallized fibres, more particularly metallized plastics fibres.
  • Suitable fibres are plastics fibres, preferably acrylic or polyester fibres, or glass fibres, which fibres have been metallized with nickel, copper or silver, or with alloys based on one or more of these metals. It has been found that metallized fibres are appreciably more suitable for the present use than metal fibres, as metallized fibres yield an appreciably better conduction upon incorporation into the article. Moreover, metal fibres have the disadvantage that in the course of time the bond in the article deteriorates. Accordingly, although metal fibres can also be used, the use of metallized fibres is preferred.
  • the conducting fibrous web may consist of conducting fibres only, but it is also possible to use a combination of conducting and non-conducting fibres in the web. In that case, for obtaining good conduction, the length of the conducting fibres is preferably 40-60 mm.
  • the web can be bonded thermically, chemically or mechanically.
  • a woven fabric can be used.
  • a combination is used of a web of metallized fibres which is in contact with a net of metal wires, for instance copper wires of a diameter of 0.05-0.5 mm, which net can be relatively coarse, having for instance a mesh of 0.5-10 cm.
  • the article according to the invention can comprise the above-described web at or just below its surface. If the web is located at the surface, the metallized fibres partly project through the plastics, so that the surface also has antistatic properties.
  • the surface resistivity of the article can be low, for instance not more than 100, preferably not more than 10, more particularly not more than 1 Ohm #. This is very favourable for obtaining a surface to be coated electrostatically.
  • the advantage of a conducting surface is that the potential can be applied in a simple manner by means of a conducting tape which is provided on the surface, for instance adjacent or on the edge.
  • the article can be made from a thermoplastic or a thermosetting plastics.
  • thermosetting plastics are phenolic resins, epoxy resins, polyester resins and polyurethane resins.
  • Thermoplastics that can be used include the various "engineering plastics" such as polypropylene, ABS and related styrene polymers, polycarbonate, polyetherimide, polyphenylene oxide, polyphenylene sulfide and mixtures of such plastics. These plastics may also be reinforced with fibres.
  • Known applications in this field are for instance articles made of fibre-reinforced polyester resin.
  • the fibres to be used for the conducting fibrous web, and also for optional fibre reinforcement of the plastics are, in particular, acrylic fibres, polyester fibres, glass fibres, carbon fibres and aramid fibres. Naturally, the choice of the fibres is partly determined by the temperatures the materials must be able to resist during manufacture and use.
  • the invention is also directed to a process for electrostatic application of a coating on a surface of a plastics article, in which article an electrically conducting fibrous web has been arranged at or below at least one of the surfaces thereof.
  • the articles according to the invention can be made in different ways, depending on the materials to be used. Generally, in such systems a closed mould is used.
  • the conducting fibrous web is introduced into a mould, optionally in combination with a fibrous web that can serve as a reinforcement of the plastics, for instance for the manufacture of a fibre-reinforced laminate.
  • Suitable methods for manufacturing the articles according to the invention are SMC and RTM techniques.
  • SMC Sheet Moulding Compounds
  • a so-called prepreg is introduced into the mould, whereupon the mould is closed and under the influence of pressure and temperature, the prepreg runs.
  • the conducting web is already present in the mould and is subsequently impregnated with the prepreg.
  • thermosetting polyester resin a fluid resin, such as a thermosetting polyester resin
  • RTM Resin Transfer Moulding
  • the fibrous webs to be used are provided with humidifiers and/or deaerators so as to improve the quality of the surface of the material. In this manner, a smooth plastics surface free of air-bubbles can be obtained.
  • the coating has been applied electrostatically, using powder coating, more particularly muffle coating.
  • powders are the conventional sinterable powders on a nylon, polyester, polyurethane or epoxy base.
  • the lacquer is baked in a known manner.
  • the web so obtained had a density of 0.48 g/cm3 measured at a pressure of 40 g/cm2 and a surface resistivity measured over a length of 10 m of ⁇ 0.1 Ohm #.
  • the web was pressed as a surface web with SMC (on the basis of unsaturated polyester resin) to form a product of high surface smoothness and low porosity.
  • the product was electrostatically coated with a polyester powdered coating.
  • the coated product was hardened at 180°C. A homogeneous and smooth surface was obtained.
  • the needle web so obtained had an elongation at break of more than 80% and a surface resistivity of ⁇ 1 Ohm #.
  • the web was used as a surface web in the RTM process (on the basis of unsaturated polyester resin). After hardening of the product and applying a potential difference between the conducting layer and the powder to be applied, the surface could be coated electrostatically.

Landscapes

  • Laminated Bodies (AREA)

Claims (10)

  1. Aus Kunststoff hergestellter Gegenstand, in dem an oder unter mindestens einer Oberfläche desselben eine elektrisch leitende Faserbahn angeordnet und der mit einer elektrostatischen Beschichtung, insbesondere einer Muffelbeschichtung, versehen ist.
  2. Gegenstand gemäß Anspruch 1, bei dem die Faserbahn mit metallisierten Fasern ausgestaltet ist.
  3. Gegenstand gemäß Anspruch 2, bei dem die Fasern mit Nickel, Kupfer, Silber oder mit einer auf einem oder mehreren dieser Metalle basierenden Legierungen metallisiert worden sind.
  4. Gegenstand gemäß Anspruch 2 oder 3, bei dem die Faserbahn mit einem Netz aus Metalldrähten versehen ist.
  5. Gegenstand gemäß den Ansprüchen 2 bis 4, bei dem die Faserbahn an der Oberfläche des Gegenstandes angeordnet ist und der Oberflächenwiderstand nicht mehr als 100, vorzugsweise nicht mehr als 10 und am meisten bevorzugt nicht mehr als 1 Ohm beträgt.
  6. Gegenstand gemäß einem der Ansprüche 1 bis 5, der zusätzlich mit einer Aussteifung aus Fasern versehen ist.
  7. Verfahren zum elektrostatischen Aufbringen einer Beschichtung auf die Oberfläche eines Kunststoffgegenstandes, wobei an oder unter mindestens einer Oberfläche des Gegenstandes eine elektrisch leitende Faserbahn angeordnet ist.
  8. Verfahren gemäß Anspruch 7, bei dem die Faserbahn durch metallisierte Fasern gebildet wird.
  9. Verfahren gemäß Anspruch 8, bei dem die Fasern mit Nickel, Kupfer, Silber oder mit einer auf einem oder mehreren dieser Metalle basierenden Legierungen metallisiert worden sind.
  10. Verfahren gemäß einem der Ansprüche 7 bis 9, bei dem die Faserbahn mit einem Netz aus Metalldrähten versehen ist.
EP91919322A 1990-09-21 1991-09-23 Kunststoffartikel mit elektrostatischer beschichtung Expired - Lifetime EP0549728B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL9002073 1990-09-21
NL9002073A NL9002073A (nl) 1990-09-21 1990-09-21 Toepassing van een geleidend vezelvlies en voorwerpen daarmee vervaardigd.
PCT/NL1991/000184 WO1992004985A1 (en) 1990-09-21 1991-09-23 Use of a conducting fibrous web and articles incorporating such a web

Publications (2)

Publication Number Publication Date
EP0549728A1 EP0549728A1 (de) 1993-07-07
EP0549728B1 true EP0549728B1 (de) 1994-12-07

Family

ID=19857711

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91919322A Expired - Lifetime EP0549728B1 (de) 1990-09-21 1991-09-23 Kunststoffartikel mit elektrostatischer beschichtung

Country Status (4)

Country Link
EP (1) EP0549728B1 (de)
DE (1) DE69105741T2 (de)
NL (1) NL9002073A (de)
WO (1) WO1992004985A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5618589A (en) * 1994-12-02 1997-04-08 Owens Corning Fiberglas Technology, Inc. Method and apparatus for coating elongate members

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2428991A (en) * 1944-01-22 1947-10-14 Harper J Ransburg Company Apparatus for spray coating articles
US3916826A (en) * 1973-09-18 1975-11-04 Electrostatic Equip Corp Electrostatic coating apparatus
JP2640851B2 (ja) * 1989-01-17 1997-08-13 ノードソン株式会社 液状フォトレジスト剤の塗布方法とその装置

Also Published As

Publication number Publication date
WO1992004985A1 (en) 1992-04-02
EP0549728A1 (de) 1993-07-07
DE69105741T2 (de) 1995-04-27
NL9002073A (nl) 1992-04-16
DE69105741D1 (de) 1995-01-19

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