pps proceeding - Abstract Preview
pps proceeding
Symposium: S13 - Rubber and elastomers
Oral Presentation
 
 

Modified glass powder as filler in rubber mixtures

Radusch Hans-Joachim (1)*, Keller Melanie (2), Wutzler Andre (2), Ferner Uwe (3), Voss Hans-Jürgen (3)

(1) University Halle-Wittenberg - Sachsen-Anhalt - Germany, (2) Polymer Service GmbH Merseburg - Sachsen-Anhalt - Germany, (3) TROVOtech GmbH Bitterfeld-Wolfen - Sachsen-Anhalt - Germany

Rubber goods are characterized by a huge variety in a lot of applications that becomes possible both by the variety in the recipe of the vulcanization system and by the filler inserted into the rubber mixture. Mainly carbon black, silica, talk or nanofillers like carbon nanotubes, graphene or nanoclay have been used successfully in technical rubber goods and tires. A novel approach of rubber filling was developed as foamed borosilicate glass particles were inserted into the rubber mixture. Foamed borosilicate glass was generated by extrusion of glass melt using a specific foaming agent and subsequent cooling and milling of the glass foam. Thus, glass particles with a size of 2-18 µm were produced and applied. Additionally, the procedure allowed a modification of the surface of glass particles. Unmodified as well as zinc and N-cyclohexyl-2-benzothiazole sulfenamide (CBS) modified glass powders were used in SSBR, BR and SSBR/BR blends. The investigation was targeted to the characterization of the influence of glass powder on vulcanization behavior and final properties of the vulcanizates. The comparative discussion of the influence of unmodified and modified borosilicate glass particles on vulcanization behavior and final elastomer properties shows that borosilicate glass particles are generally suitable as carrier of functionalizing groups for elastomer modification. Here, the substitution of environmental unfriendly zinc oxide (ZnO) as vulcanization accelerator in rubber mixtures by Zn modified glass powder became specific interest. Insertion of Zn modified glass powder resulted in the reduction of incubation time and cross-linking period during cross-linking process as well as reduction of loss factor at 60°C. Furthermore, the content of Zn modified glass powder had a significant influence on the properties of the vulcanized samples investigated, expressed by the increased ultimate mechanical properties tensile strength and elongation at break.