The Potential Of Wollastonite As A New Filler For Natural Rubber Compounds
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Date
2013-10
Authors
Bich Diep, Hoang Thi
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Wollastonite or calcium silicate, (CaSiO3) has potential as a new type of filler
in natural rubber (NR) compounds. The curing characteristics, mechanical properties,
swelling behavior, thermal stability and morphology of wollastonite filled NR
compounds were investigated. Four series of experiments were performed. All NR
compounds were prepared using a two roll mill with different filler loading from 0 to
40 phr. In the first series, the effects of different wollastonite loading on the
properties of NR compounds were studied. Results indicated that the cure time (t90),
scorch time (ts2), tensile strength and elongation at break (Eb) decreased, whereas,
maximum torque (MH), tensile modulus, hardness, thermal stability and swelling
behavior increased with wollastonite loading. The second series, the effect of
physical ball mill treated wollastonite on the properties of NR compounds was
investigated. Treated wollastonite improved the properties of NR compounds as
compared to untreated wollastonite. The third series, the effect of 1 phr of 3-
aminopropyltriethoxysilane (APTES) as silane coupling agent was studied. The
presence of APTES showed an improvement in the properties of NR compounds.
This was due to the presence of APTES, which enhanced the rubber-filler interaction
of NR compounds. In the last series, the influence of partial replacement of
wollastonite by carbon black or calcium carbonate was investigated. The substitution
of wollastonite by commercial fillers have improved the properties of NR
compounds.
Description
Keywords
Wollastonite , Natural Rubber Compounds