ISSN:
0032-3888
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
This paper explores the use of silica as a major component, 67% and 100%, of total filler content in natural rubber, carbon black being the minor component. In order to overcome the mixing difficulty, a coupling agent was used. A previous study dealt with the causes of difficulty in extruding high-silica and all-silica compounds. A premature reaction of the coupling agent with natural rubber resulted in wavy extrudates. In the case of a 100% silica compound, the filler dispersion and distribution were not satisfactory in spite of the presence of the coupling agent. The compound was too stiff to be extrudable. In the present work, metal carbonates were added to the formulation. They included calcium, zinc, magnesium, and lead carbonates. These additives significantly facilitated the incorporation, distribution, and dispersion of the filler. The resulting compounds were soft enough to be extruded. The extrudate surfaces were smooth to slightly wavy. Decreasing the amount of the coupling agent to 75% of the original recipe still allowed the compounds to be extruded, although the waviness of the extrudates increased somewhat.
Additional Material:
22 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pen.760321502
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