WO2001049476A1 - Procede de traitement de surface d'elastomeres - Google Patents

Procede de traitement de surface d'elastomeres Download PDF

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Publication number
WO2001049476A1
WO2001049476A1 PCT/EP2000/013324 EP0013324W WO0149476A1 WO 2001049476 A1 WO2001049476 A1 WO 2001049476A1 EP 0013324 W EP0013324 W EP 0013324W WO 0149476 A1 WO0149476 A1 WO 0149476A1
Authority
WO
WIPO (PCT)
Prior art keywords
workpiece
stretched
energy flow
elastomeric material
membrane
Prior art date
Application number
PCT/EP2000/013324
Other languages
German (de)
English (en)
Inventor
Frank Katzenberg
Original Assignee
Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. filed Critical Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
Publication of WO2001049476A1 publication Critical patent/WO2001049476A1/fr

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Classifications

    • 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
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/16—Surface shaping of articles, e.g. embossing; Apparatus therefor by wave energy or particle radiation, e.g. infrared heating
    • 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
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/14—Surface shaping of articles, e.g. embossing; Apparatus therefor by plasma treatment

Definitions

  • the invention relates to a method for the surface treatment of a workpiece made of an elastomeric material with an energy flow acting on the surface of the workpiece.
  • Elastomeric materials consist of macromolecules, which are literally entangled with each other and cross-linked or connected in only a few places. For this reason, such materials are extremely elastic. It is possible to reversibly pull elastomers apart by a multiple of their original length. This rubber behavior does not change to a certain extent even when heated.
  • elastomers are used as membrane-shaped workpieces in systems, for example hydraulic systems, in which they serve as force or pressure-transmitting units that also have a separating function, for example the separation between a liquid and a gaseous working medium.
  • a well-known area of application are so-called pressure accumulators of hydraulic systems, in which the elastomer membrane is subjected to strong strains caused by the different pressure conditions in the membrane separate pressure storage areas, in which on the one hand gas and on the other hand hydraulic oil are provided.
  • the separating membrane should be as gas-tight as possible, so that a gas pressure loss on the gas side of the pressure accumulator can be excluded as far as possible. In order to achieve maintenance-free maintenance over the life of such pressure accumulators, it should be ensured that the gas does not diffuse through the membrane into the hydraulic oil and the pressure accumulator thus loses its effectiveness.
  • the higher modulus of elasticity in the thin surface-treated layer of the elastomer due to the higher degree of crosslinking proves to be problematic.
  • the membrane is stretched, the higher modulus of elasticity results in a significantly higher tension in the treated surface layer than in the underlying material. This leads to tearing of this highly cross-linked layer and makes it almost ineffective in terms of the desired permeation reduction.
  • the object of the invention is to develop a method for the surface treatment of a workpiece made of an elastomeric material with an energy flow acting on the surface of the workpiece such that an elastomeric workpiece is obtained in which the gas permeation is greatly reduced or almost completely prevented.
  • the permeation should be significantly reduced.
  • the method for surface treatment of a workpiece made of an elastomeric material with an energy flow acting on the surface of the workpiece is developed in such a way that the energy flow acts on the workpiece while the workpiece is in the stretched state.
  • the invention addresses the problem that arises when a workpiece made of an elastomeric material, preferably in the form of a
  • Membrane with an energy flow, preferably an ion beam on it
  • the invention is able to prevent this increase in permeation due to crack formation by applying an energy flow to the elastomeric workpiece in a stretched state, which contributes to increasing the degree of crosslinking, at least in the surface layer of the workpiece.
  • the elastomeric workpiece In its stretched state, the elastomeric workpiece is preferably exposed to a surface plasma, so that high-energy ions are applied to its surface.
  • the elastomeric workpiece remains statically in the stretched state, i.e. the elastomeric workpiece is not subject to dynamic external forces during the surface treatment.
  • Energy flows of a different nature, such as, for example, high-energy electromagnetic radiation, are also conceivable for the aforementioned surface layer treatment.
  • the elastomeric workpiece should be stretched as much as possible, preferably in the same way in which it is also stretched to a maximum during its later technical use.
  • the energy flow acting on the workpiece in the form of a plasma treatment in addition to the aforementioned increase in the degree of crosslinking, also results in complete relaxation of the thin surface layer of the workpiece.
  • the reason for this is that there are usually two processes involved in the irradiation of polymers, a so-called chain cleavage and a so-called chain crosslinking. Both processes run simultaneously and are dynamic Balance to each other.
  • the macromolecules of the elastomer can relax through chain splitting. The remaining radicals can then recombine in a state of lower free enthalpy. The greatly reduced permeation of the elastomer is due to two effects.
  • FIG. 1 Schematic cross section through an expanded elastomer membrane during the surface treatment
  • the elastomer membrane is stretched to the maximum elongation that occurs in later operation.
  • stretching can be done by clamping and mechanical deflection, and in bladder membranes by filling the membrane with a certain gas partial pressure.
  • the Surface treatment of the membrane can be carried out, for example, with argon or nitrogen ions. In principle, other ions are also conceivable.
  • Fig. 1 the cross section of an expanded membrane 1 is shown, which is preferably made of fluororubber (FPM) or acrylonitrile-butadiene rubber (NBR).
  • the elastomer membrane 1 typically has a thickness of 2 to 3 mm and a diameter of approximately 60 mm.
  • the membrane 1 is gas-tightly attached to a housing 2 by means of fastening clips 3, in which an internal pressure Pi of approximately 5 bar is produced by supplying nitrogen. Due to the large internal pressure Pi, compared to the normal external pressure P 0 , the elastomer membrane 1 bulges outwards, as a result of which it assumes the stretched state shown in FIG. 1. In this stretched state, the elastomer surface of the membrane 1 is exposed to an argon plasma with an output of approximately 0.4 W / cm 2 and an irradiation time of approximately 1 minute.
  • FPM fluororubber
  • NBR acrylonitrile-butadiene rubber
  • the method according to the invention represents a cost-effective way of producing elastomer workpieces that withstand strong mechanical stresses and at the same time guarantee high gas resistance.

Landscapes

  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)

Abstract

La présente invention concerne un procédé permettant de réaliser le traitement de surface d'une pièce constituée d'un matériau élastomère grâce à un flux d'énergie agissant sur la surface de la pièce. L'invention se caractérise en ce que le flux d'énergie agit sur la pièce alors que la pièce est étendue.
PCT/EP2000/013324 2000-01-04 2000-12-29 Procede de traitement de surface d'elastomeres WO2001049476A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10000132.7 2000-01-04
DE2000100132 DE10000132A1 (de) 2000-01-04 2000-01-04 Verfahren zur Oberflächenbehandlung von Elastomeren

Publications (1)

Publication Number Publication Date
WO2001049476A1 true WO2001049476A1 (fr) 2001-07-12

Family

ID=7626739

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/013324 WO2001049476A1 (fr) 2000-01-04 2000-12-29 Procede de traitement de surface d'elastomeres

Country Status (2)

Country Link
DE (1) DE10000132A1 (fr)
WO (1) WO2001049476A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7351346B2 (en) 2004-11-30 2008-04-01 Agoura Technologies, Inc. Non-photolithographic method for forming a wire grid polarizer for optical and infrared wavelengths
US7561332B2 (en) 2004-11-30 2009-07-14 Agoura Technologies, Inc. Applications and fabrication techniques for large scale wire grid polarizers

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10318566B4 (de) * 2003-04-15 2005-11-17 Fresnel Optics Gmbh Verfahren und Werkzeug zur Herstellung transparenter optischer Elemente aus polymeren Werkstoffen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998916A (en) * 1974-03-25 1976-12-21 N.V. Verto Method for the manufacture of an electret fibrous filter
FR2459262A1 (fr) * 1979-06-19 1981-01-09 Shinetsu Chemical Co Procede de fabrication de produits faconnes en resine a base de chlorure de vinyle ayant des proprietes de surface ameliorees a l'aide d'un plasma de basse temperature
US4337768A (en) * 1980-02-26 1982-07-06 Toray Industries, Inc. Polyvinyl chloride sheet and method of making the same
DE19738721A1 (de) * 1997-09-04 1999-03-11 Buck Chem Tech Werke Vorrichtung zum Plasmabehandeln von Kunststoff und dazu verwendbares Verfahren
EP0948969A1 (fr) * 1998-04-02 1999-10-13 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Procédé de traitement à plasma en corps creux

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563871A (en) * 1969-11-14 1971-02-16 Ford Motor Co Process for reducing the surface friction of an elastomer using radiation and an oxygen free atmosphere
US5202025A (en) * 1989-04-12 1993-04-13 Terumo Kabushiki Kaisha Porous membrane and method for preparing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998916A (en) * 1974-03-25 1976-12-21 N.V. Verto Method for the manufacture of an electret fibrous filter
FR2459262A1 (fr) * 1979-06-19 1981-01-09 Shinetsu Chemical Co Procede de fabrication de produits faconnes en resine a base de chlorure de vinyle ayant des proprietes de surface ameliorees a l'aide d'un plasma de basse temperature
US4337768A (en) * 1980-02-26 1982-07-06 Toray Industries, Inc. Polyvinyl chloride sheet and method of making the same
DE19738721A1 (de) * 1997-09-04 1999-03-11 Buck Chem Tech Werke Vorrichtung zum Plasmabehandeln von Kunststoff und dazu verwendbares Verfahren
EP0948969A1 (fr) * 1998-04-02 1999-10-13 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Procédé de traitement à plasma en corps creux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7351346B2 (en) 2004-11-30 2008-04-01 Agoura Technologies, Inc. Non-photolithographic method for forming a wire grid polarizer for optical and infrared wavelengths
US7561332B2 (en) 2004-11-30 2009-07-14 Agoura Technologies, Inc. Applications and fabrication techniques for large scale wire grid polarizers

Also Published As

Publication number Publication date
DE10000132A1 (de) 2001-07-12

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