Technische Produkte

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Technische Produkte

The Influence of Moulding Temperature on the Strength of Natural Rubber to Metal Bonded Joints

The influence of moulding temperature on the peel strength of a bonded joint was investigated for a sulphur cured semi-EV natural rubber vulcanisate. A higher peel force was recorded at the higher moulding temperature. The effect of vulcanisation temperature on peel strength was thought to arise from a change in the physical properties of the […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Reclaiming of Rubber by a Renewable Resource Material – Assessment of Vulcanized SBR Reclaiming Process*

Sulfur cured SBR vulcanizates were reclaimed by a renewable resource material (RRM) which is a vegetable product. The progress of reclaiming was monitored by estimating the sol and gel portions, molecular weight determination of sol and Mooney viscosity of reclaimed rubber. The properties of SBR reclaim were evaluated by mixing it with fresh rubber in […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Elastomermischungen spezifizieren und prüfen

Durch eine Spezifikation müssen Forderungen an eine Gummimischung beschrieben, d. h. die wesentlichen Eigenschaften müssen definiert, quantifiziert und mit Toleranzen versehen werden. Daraus ergeben sich Forderungen nach Prüfverfahren für die wichtigsten Funktionseigenschaften aber auch die Verarbeitbarkeit. Die bekanntesten Prüfmethoden zur Mischungsfreigabe werden bewertet. Für die Verarbeitung sind rheologische Prüfungen von großer Wichtigkeit. Um die Funktionseigenschaften […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Friction Effects in the Contact Area of Sliding Rubber: a Generalized Schallamach Model

Based on the original Schallamach-model we present a generalized theory that predicts the buckling effects and the tangential stress gradient as the driving force for the waves of detachement. In contrast to the original Schallamach-model the generalized theory considers a non-Coulombian rubber friction coefficient μ(p) that depends on the local normal pressure. Furthermore, numerical solutions […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Influence of Compounding Materials on Tire Durability

This paper illustrates, in a general way, how compounding raw materials used in several non-tread tire components can affect their properties that in turn will influence tire durability. Examples are given of the effect of polymers, antidegradants and curing agents on compound properties including weather resistance, impermeability, fatigue resistance, hysteresis and adhesion. Included is data […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

High Temperature Curing of Passenger Tires by Using 1,3 Bis-(Citraconimidomethyl) Benzene

1,3 bis(citraconimidomethyl)benzene, an extremely effective antireversion agent, maintains the physical properties of vulcanizates that are overcured or cured at high temperatures. This paper summarizes laboratory results obtained in a typical passenger tread compound that demonstrate the feasibility of improving productivity by increasing cure temperatures. Hochtemperaturvulkanisation von PKW-Reifen unter Verwendung von 1,3-Bis- (Citraconimidmethyl)benzolDas oben genannte Agens […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Calorimetric and X-Ray Investigations of Polyamide-6 and Blends with a Polyethyl Acrylate Elastomer – Part III: Crystallization-, Melting- and B

In PA-6/PEA-blends the crystallization potential of PA-6 is reduced by reactions leading to either longer or crosslinked chains. Depending on the mechanical pre-treatment, blends with less than 40 wt-% PA-6 crystallize in 2 or 3 steps. For the system PA-6/PEA (W(PA-6) = 0.2) it has been shown that a multi-step crystallization does only occur if […] mehr...

28.April 2003 - Neues aus der Forschung

Peripherietechnik

Recent Developments in Extrusion of Tire Components1

In recent years there were no revolutionary inventions in the field of rubber compound plastification and profile shaping (such as multi component heads, roller head and single roll roller die units or pin extruders), however, there are many most interesting developments and improvements of almost all line components, resulting in a better handling and use […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Rubber-Metal Bonding as an Electrochemical Process

Rubber-brass bonding during vulcanization has already been previously discussed as a result of ionic reaction mechanisms. If electrically charged species (e. g. metal and sulfide ions) are formed, the bonding process should be influenced by an electric field. An experimental set-up for the application of a voltage during vulcanization and the preparation of test specimens […] mehr...

28.April 2003 - Neues aus der Forschung

Peripherietechnik

Abschätzung und Auslegung von Extrudern für Reifenprofile

Die genaue Berechnung der Extrudergrößen in einer Anlage zur Extrusion von Profilen für die Reifenherstellung verlangt genaue Kenntnisse nicht nur über die geplanten Kapazitäten und Dimensionen, sondern auch über die Zusammensetzungen und die Verarbeitungseigenschaften der verwendeten Kautschukmischungen. Da oft nur unvollständige Informationen vorliegen und aus Kosten- oder anderen Gründen auch nicht immer Versuche mit dem […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Tire Compound Materials Interactions

Considering a modern tire compound, it has been shown that the materials interactions play a very significant role. This paper also indicates that a good dispersion may well solve the problem of the so-called magic triangle. Indeed a good dispersion improves all fundamental tire properties.. To achieve a good dispersion obviously both the carbon black […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Reinforcement of Silica-Filled EPM Compounds using Vinylsilanes

This paper demonstrates that the addition even of small amounts of vinylsilane strongly enhances the reinforcement of silica-filled rubber compounds. With regard to coupling efficiency, processibility, and health concerns the vinyltriethoxysilane VP Si 225 as well as the oligomerized vinylsilane Dynasylan 6498 are best suited for the rubber industry. Furthermore, the influence of the amount […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Lebensdauerprüfung von Elastomerbauteilen

Gummifedern für Schienenfahrzeug-Drehgestelle stellen komfort- und laufdynamisch relevante Bauteile mit besonderen Zuverlässigkeitsanforderungen dar. Ein Lebensdauernachweis für Neuentwicklungen kann im allgemeinen nur auf Basis ein- oder multiaxialer Bauteilprüfungen erbracht werden. Hierbei gilt es, die realen Bauteilbelastungen des Fahrbetriebes in möglichst repräsentativer Form zu erfassen und anschließend in Prüfsignale für den Laborversuch zu transformieren. Neben dem komplexen […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Effects of Different Ingredients and Cure Parameters on Physical Properties of a Tyre Tread Compound

The effect of polymer blends, viz. NR/BR, NR/SBR and SBR/BR, and cure parameters such as cure time and cure temperature on the hardness of a tyre tread compound has been investigated. Along with the hardness, other physical properties have also been measured with variation of the above blend compositions and cure parameters. The empirical relationships […] mehr...

28.April 2003 - Neues aus der Forschung

Technische Produkte

Improved Tread Compound Wet/Winter Traction Using Brominated Isobutylene-co-para-Methylstyrene1

Use of brominated isobutylene-co-para-methylstyrene (BIMS) improves the laboratory dynamic properties predictive of wet and winter traction of formulations modeling all-season, winter and high-traction passenger tire treads. Blends of BIMS with cis-polybutadiene, natural rubber, and solution-polymerized styrene-butadiene rubbers having varying microstructures were studied in silica-filled compounds. Selective substitution of the BIMS elastomer was made in order […] mehr...

28.April 2003 - Neues aus der Forschung

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