The CMPS (chemically modified precipitated silica) was shown to have a core precipitated silica particle with a significant organic surface. Chemical and physical analysis and rubber compound evaluations indicate that the surface of the CMPS discussed in this paper has been modified to provide improved filler-filler and polymer-filler interactions within hydrocarbon polymer based compounds. For passenger tread compounds these modifications result in predictions of further improvements in traction, rolling resistance and wear resistance compared to the current conventional HDS(high dispersible silica)/in-situ silane addition technology. These performance benefits are achieved while also eliminating the manufacturing challenges presented by the current conventional HDS/in-situ silane addition technology. The results indicate that the CMPS shows a significant decrease in the polarity or hydrophilicity of the filler surface or a significant increase in non-polar or organophilic character. The combination of coupling agents and non-coupling agents used in the CMPS significantly improves the friability of this performance filler over conventional HDS. Mercaptoorganometallic was shown to be the preferred coupling agent in the CMPS due to its higher coupling effectiveness. It was also noted that attaching the mercaptoorganometallic significantly reduced if not eliminated any objectionable odor. The CMPS was shown to essentially not have any alcohol, could not produce any alcohol and did not produce any alcohol within the Banbury mixer, non-cured or cured compounds. The extruded compound containing CMPS does not show any of the porous zones or blisters typically seen for compounds containing the conventional HDS with in-situ TESPT(Bis(triethoxy-sisylpropyl)tetrasulfide addition. This allows for increased extrusion speeds. The compound containing CMPS showed no change in viscosity indicating very good shelf stability. Compound containing CMPS produced using mercaptoorganometallic as the coupling agent does not show any pre-cure effects which allow higher drop temperatures. This in-turn allows for further improvements in reinforcement and in dynamic properties typically predictive of higher traction and lower rolling resistance. Agilon 400, a specific commercialized chemically modified precipitated silica produced with a specific combination of mercaptoorganometallic and non-coupling agents was compared to the conventional HDS/in-situ TESPT addition technology. This comparison showed that this CMPS could be mixed in a single pass using significantly shorter mix times. Adjustments in the filler loading and cure package were required to provide the equivalent compound density and hardness and similar crosslink density. Results indicated that the specific combination of mercaptoorganometallic and non-coupling agents used to produce this particular CMPS effectively shielded the mercapto function such that the scorch time was prolonged significantly while maintaining the relatively faster cure rates and the higher coupling effectiveness of the mercaptoorganometallic. This CMPS containing compound was shown to have very good processability and handling, to be very well dispersed, and to have properties predicting improved abrasion resistance, lower rolling resistance and higher traction. The results suggest that the improved coupling efficiency/polymer-filler interaction shown by the mercaptoorganometallic plus the increase in the organophilic nature of the CMPS performance filler provides the appropriate combination of covalent linkages as well as physical interaction with the non-polar or low polar hydrocarbon polymers to provide improved abrasion resistance. The combination of mercaptoorganometallic and specific non-coupling agent(s) used to produce this particular CMPS were effective in reducing bonds that affect lower strains (i.e. filler-filler interactions) while maintaining the ability to develop bonds that affect higher strains (i.e. polymer-filler interactions). This combination of interactions provides an appropriate hysteretic response that leads to predictions of higher traction and lower rolling resistance performance.


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    Titel :

    Chemically modified precipitated silica: Eliminates production drawbacks and enhances fuel efficiency, safety and environmental performance


    Weitere Titelangaben:

    Chemisch modifiziertes, gefälltes Siliciumdioxid eliminiert Produktionshindernisse und verbessert die Kraftstoffeffizienz, Sicherheit und Umweltverträglichkeit


    Beteiligte:


    Erscheinungsdatum :

    2009


    Format / Umfang :

    33 Seiten, 16 Bilder, 5 Tabellen, 66 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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