DE10025602A1 - Surface treatment of elastomer valve seals used in motor vehicles involves subjecting to an ozone and air gas mixture - Google Patents
Surface treatment of elastomer valve seals used in motor vehicles involves subjecting to an ozone and air gas mixtureInfo
- Publication number
- DE10025602A1 DE10025602A1 DE2000125602 DE10025602A DE10025602A1 DE 10025602 A1 DE10025602 A1 DE 10025602A1 DE 2000125602 DE2000125602 DE 2000125602 DE 10025602 A DE10025602 A DE 10025602A DE 10025602 A1 DE10025602 A1 DE 10025602A1
- Authority
- DE
- Germany
- Prior art keywords
- ozone
- gas mixture
- motor vehicles
- surface treatment
- air gas
- 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.)
- Withdrawn
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 14
- 239000000806 elastomer Substances 0.000 title claims abstract description 14
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 title claims abstract description 6
- 239000000203 mixture Substances 0.000 title claims abstract description 5
- 238000004381 surface treatment Methods 0.000 title claims description 3
- 238000000034 method Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000004033 plastic Substances 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 18
- 239000007789 gas Substances 0.000 claims description 3
- 239000012080 ambient air Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 4
- 229920006168 hydrated nitrile rubber Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000006385 ozonation reaction Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005949 ozonolysis reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/12—Chemical modification
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/009—After-treatment of articles without altering their shape; Apparatus therefor using gases without chemical reaction
-
- 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
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0009—After-treatment of articles without altering their shape; Apparatus therefor using liquids, e.g. solvents, swelling agents
- B29C2071/0018—Absorbing ingredients, e.g. drugs, flavourings, UV screeners, embedded in the articles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2321/00—Characterised by the use of unspecified rubbers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Sealing Material Composition (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Oberflächenbehandlung von in Schaltventilen von Kraftfahrzeugen für Flüssigkeiten oder Gase eingesetzten Dichtelementen, bestehend aus Elastomeren oder Elastomer-Mischungen.The invention relates to a method for the surface treatment of in Switching valves used in motor vehicles for liquids or gases Sealing elements consisting of elastomers or elastomer mixtures.
Aus der EP 0 633 415 B1 ist ein solches Schaltventil bekannt, bei dem ein aus einem Elastomer bestehendes Dichtelement in einem Kunststoffkörper eingesetzt ist und in Verbindung mit entsprechenden Ventilsitzen wirkt. Bei Elektromagnetventilen die als pulsbreitenmodulierte Schaltventile mit hoher Schaltfrequenz eine hohe Schaltspielzahl erreichen müssen, ist die Dauerhaltbarkeit, d. h. die Verschleißfestigkeit, des Dichtelementes von großer Bedeutung. Die Einsatzbedingungen für solche Dichtelemente in Funktionsbauteilen von Kraftfahrzeugen, insbesondere im Motorenraum mit Temperaturen zwischen -40°C und 180°C erfordern Elastomer-Werkstoffe mit konstanten Eigenschaften im gesamten Temperaturbereich. Darüber hinaus ist auch die Beständigkeit gegenüber Kraftstoffen, Ölen etc. notwendig. Der Elastomer-Werkstoff HNBR/NBR (genauer Teil-Hydrierter-Acrylnitril-Butadien- Kautschuk) verfügt über die geforderten Eigenschaften. Bei dem Einsatz solcher Werkstoffe für den angegebenen Verwendungszweck kommt neben der angesprochenen Lebensdauerproblematik noch hinzu, daß sie eine gewisse Haft- oder Klebeneigung gegenüber dem Ventilsitz aufweisen. Dies bedeutet, daß nach längerer Zeit in geschlossenem Ventilzustand das Dichtelement am Ventilsitz anhaftet und sich das Ventil nur verzögert mit erhöhtem Kraftaufwand öffnen läßt. Kurze Ventilansprechzeiten und kleine Verstellwege werden durch den Klebeffekt der Dichtelemente stark behindert. Zur Verringerung der Klebeneigung ist die Beschichtung mit Teflon als Anti-Haft-Mittel bekannt. Problematisch ist hierbei jedoch die Langzeitwirkung in kraftstoffhaltiger Atmosphäre.Such a switching valve is known from EP 0 633 415 B1, in which an on an elastomer sealing element used in a plastic body and works in conjunction with appropriate valve seats. At Solenoid valves as switching valves with high pulse width modulation Switching frequency must reach a high number of switching cycles is Durability, d. H. the wear resistance, the sealing element of great Importance. The conditions of use for such sealing elements in Functional components of motor vehicles, especially in the engine compartment Temperatures between -40 ° C and 180 ° C require elastomer materials constant properties in the entire temperature range. Beyond that resistance to fuels, oils etc. is also necessary. The Elastomer material HNBR / NBR (more precisely part-hydrogenated-acrylonitrile-butadiene- Rubber) has the required properties. When using such Materials for the specified purpose come in addition to the added life-time problems that they have a certain liability or have a tendency to stick to the valve seat. This means that after the sealing element on the valve seat for a long time when the valve is closed adheres and the valve can only be opened after a delay with increased effort. Short valve response times and short adjustment paths are due to the adhesive effect the sealing elements severely hindered. To reduce the tendency to stick is the Coating with Teflon is known as a non-stick agent. This is problematic however, the long-term effect in a fuel-containing atmosphere.
Aufgabe der Erfindung ist es diese Nachteile bei Dichtelementen aus Elastomeren zu beseitigen.The object of the invention is to address these disadvantages with sealing elements made of elastomers to eliminate.
Diese Aufgabe wird durch das Verfahren nach Anspruch 1 gelöst.This object is achieved by the method according to claim 1.
Das Verfahren kann auch eingesetzt werden bei Dichtelementen die mit Trägerelementen aus Kunststoff oder Metall verbunden sind.The method can also be used for sealing elements with Carrier elements made of plastic or metal are connected.
Die Behandlung von Elastomeroberflächen zur Prüfung von Elastomeren, insbesondere NBR ist im Kraftfahrzeugbereich bekannt (Ozonolyse).Treatment of elastomer surfaces for testing elastomers, NBR in particular is known in the motor vehicle sector (ozonolysis).
Bei dem erfindungsgemäßen Verfahren bestehen die Elastomer-Dichtelemente für Ventile aus einem Co-Polymer HNBR/NBR (genauer Teil-Hydrierter- Acrylnitril-Butadien-Kautschuk). Die Ozonisierung hat folgende Wirkung: Das Ozon greift die NBR-Bestandteile des Elastomers an. Die Doppelbindung der Monomere wird zerstört. Die Oberfläche verhärtet und die Struktur verändert sich. Dadurch kommt es zur Abnahme der Klebeneigung. Das Innere des Dichtelementes bleibt unverändert. Hierdurch wird die Verschleißfestigkeit und Dauerhaltbarkeit der Dichtelemente vergrößert.In the method according to the invention, there are the elastomer sealing elements for valves made of a co-polymer HNBR / NBR (more precisely partially hydrogenated Acrylonitrile butadiene rubber). Ozonization has the following effect: Ozone attacks the NBR components of the elastomer. The double bond of Monomers are destroyed. The surface hardens and the structure changes. This leads to a decrease in the tendency to stick. The inside of the Sealing element remains unchanged. This makes the wear resistance and Durability of the sealing elements increased.
Da die Dichtelemente diesem Verfahrensschritt als letzte Fertigungsstufe unterzogen werden und hierbei nicht Abmessungen bzw. Toleranzen beeinflußt werden, ist die Wirkung dieses Verfahrens dauerhaft, da die durch die Behandlung beeinflußte Oberfläche nicht durch nachfolgende Verfahrensschritte bzw. Herstellungsprozesse abgetragen bzw. beeinträchtigt wird. Die Verfahrensparameter müssen in Abhängigkeit von Größe, Beschaffenheit und Werkstoff der Dichtelemente bestimmt werden. Unter Beschaffenheit der Dichtelemente wird z. B. die Verbindung des Dichtelementes mit einem Trägerelemente aus Kunststoff oder Metall verstanden. Because the sealing elements use this process step as the last stage of production are subjected to dimensions and tolerances be, the effect of this procedure is permanent, since the through the Treatment does not affect the surface by subsequent process steps or manufacturing processes are removed or impaired. The Process parameters must depend on size, nature and Material of the sealing elements can be determined. Under the nature of the Sealing elements such. B. the connection of the sealing element with a Understand plastic or metal support elements.
Die Ozonisierung erfolgt bei 2 ppm (-15%) Ozonkonzentration {Umgebungsluft wird mit O3 angereichert}, (25 + 3) °C und (60 ± 5)% relativer Luftfeuchte über eine Einwirkzeit von (5 ± 3) Stunden.Ozonation takes place at 2 ppm (-15%) ozone concentration {ambient air is enriched with O3}, (25 + 3) ° C and (60 ± 5)% relative humidity over a Exposure time of (5 ± 3) hours.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2000125602 DE10025602A1 (en) | 2000-05-24 | 2000-05-24 | Surface treatment of elastomer valve seals used in motor vehicles involves subjecting to an ozone and air gas mixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2000125602 DE10025602A1 (en) | 2000-05-24 | 2000-05-24 | Surface treatment of elastomer valve seals used in motor vehicles involves subjecting to an ozone and air gas mixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE10025602A1 true DE10025602A1 (en) | 2001-11-29 |
Family
ID=7643312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2000125602 Withdrawn DE10025602A1 (en) | 2000-05-24 | 2000-05-24 | Surface treatment of elastomer valve seals used in motor vehicles involves subjecting to an ozone and air gas mixture |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE10025602A1 (en) |
-
2000
- 2000-05-24 DE DE2000125602 patent/DE10025602A1/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8127 | New person/name/address of the applicant |
Owner name: PIERBURG GMBH, 41460 NEUSS, DE |
|
| 8139 | Disposal/non-payment of the annual fee |