It has been shown that process additives can have very positive influences on the processability of silica filled tread compounds. When added in the second stage of a three stage mixed compound, Struktol VP 1454 produced a significant reduction in Mooney viscosity with almost no increase in Mooney viscosity following compound storage after mixing. This is a significant advantage for any production operation. Compounds often cannot be processed promptly and variable time delays between process steps during production are inevitable. Struktol VP 1454 minimises any adverse effects due to this. Extrusion of silica filled tread compounds is often poor. This is directly related to the viscosity issue described. Struktol VP 1454 produced compound that exhibited the lowest extrusion pressure in laboratory trials at constant screw speed. The low pressure is a big advantage; scorch risk is much reduced due to lower frictional heating. In production it would be possible to increase screw speed to a value where maximum permissible pressure is reached. This in turn would result in a significant increase in productivity. Struktol VP 1454 does not compromise cure characteristics, scorch time is lengthened whilst cure time is unchanged. This is of benefit in production. Cured modulus may be slightly reduced by use of process additives. This effect is noticeable with the use of a 2nd generation additive. Struktol VP 1454 when used at a reduced loading of 2 phr (parts per hundred parts of resin) exhibits an almost unchanged modulus. Dynamic properties obtained with Struktol VP 1454 are similar to control compound. The high severity flex test to measure heat build up and failure was not at all compromised by the use of Struktol VP 1454. Tyre performance in terms of rolling resistance and grip properties is predicted to be unchanged, as evidenced by the tangent delta measurements, when Struktol VP 1454 was used. The product design target, 'to achieve effective silica surface coating' and hence reduce the degree of silica-to-silica interaction appears to have been achieved. Low strain amplitude testing of uncured modulus is seen as further supporting evidence of the stable viscosity that this has been achieved.


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    Titel :

    Process additives for silica filled compounds. Processing without property loss


    Beteiligte:
    Clarke, Colin (Autor:in) / Hensel, Manfred (Autor:in) / Umland, Henning (Autor:in)


    Erscheinungsdatum :

    2005


    Format / Umfang :

    10 Seiten, 9 Bilder, 4 Tabellen, 3 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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