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African Journal of Science and Technology

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Investigating the Use of a Protective Coating Material as an Antiozonant for Natural Rubber Under Dynamic Deformation

M. J. Bhala

Abstract


Petroleum wax is known to provide ozone protection to natural rubber under static deformation while a combination of chemical antiozonant and wax is normally used for ozone protection under dynamic conditions. The work described in this paper, aims at investigating the effectiveness of a coating material in protecting a natural rubber substrate from ozone cracking under dynamic deformation. Two compounds (without an antiozonant system) and NRAo (with an antiozonant system) were used as substrates while a grade of liquid nitrile-butadiene rubber was applied as a coating on the substrate surface. Dynamic ozone tests were carried out under standard ASTM D430-88 methods with samples strained to 25%. Comparison of cracking under continuous dynamic conditions and intermittent dynamic conditions were made. Initial results showed that the protective coating was more effective as an antiozonant under intermittent conditions where a combination of wax and a chemical antiozonant were incorporated.

(Af. J. of Science and Technology: 2002 3(2): 123-126)



http://dx.doi.org/10.4314/ajst.v3i2.15277
AJOL African Journals Online