Use of rice bran oil and epoxidized rice bran oil in carbon black–filled natural rubber–polychloroprene blends

Abstract

ABSTRACT:In the present study we report the results obtained on the use of rice bran oil (RBO), a naturally occurring nontoxic oil, and its epoxidized variety (epoxidized RBO, or ERBO) in the compounding and vulcanization of different natural rubber-chloroprene rubber (NR-CR) blends. The processability, cure characteristics, and physical properties of the blends prepared with these oils were compared with those of control mixes prepared with aromatic oil. The optimum cure time and scorch time values of the different blends prepared with these oils were found to be lower than those of the respective control blends prepared with aromatic oil. Evaluation of physical properties of the different experimental blends showed that replacement of aromatic oil with these oils did not adversely affect their physical properties. Because RBO contains a good amount of free fatty acids it was tried as a coactivator in addition to its role as a processing aid. The level of these oils required for the blend preparation was optimized in a Brabender plasticorder. Physical properties such as tensile strength, elongation at break, tear strength, swelling index, and abrasion loss, for example, were evaluated for both experimental and control mixes. Comparison of cure characteristics and physical properties of the blends prepared with aromatic oil and with these oils showed that these oils could be used in place of aromatic oil in the above blends. It is also to be noted that aromatic oil is of petroleum origin and is reported to be carcinogenic.

Effect of Vegetable Oils as Processing Aids in SBR Compounds

“…This may be the plasticization effect of oil at the carbon black/rubber interface. [6] It was also found that the vulcanizates containing both vegetable oils gave higher hardness than that of the vulcanizate with aromatic oil at all levels. This is due to the high unsaturation of vegetable oils participating in crosslinking.…”

“…That is, the layers of oils are present at rubber-carbon black interfaces. [6] However, the compounds containing all types of processing oil did not show significantly different in cure times.…”

“…Therefore, all vegetable oils used could act as coupling agents between the carbon black and rubber matrix, leading to an enhancement in hardness and lowering of volume loss. [6] Although, there is no appreciable variation in the crosslink density of the vulcanizates containing all types of processing oil. Moreover, volume loss of the rubber vulcanizate containing aromatic oil clearly increased with increasing the oil content due to the presence of a multi-layer of oil at the rubber-carbon black interfaces leads to its macroplasticization effect, as well as form loose bonds.…”

“…Epoxidized vegetable oils (EVO) can be used as processing aids for elastomers. [6][7] The unsaturated double bonds of vegetable oils rich in oleic, linoleic and linolenic acyl groups easily converted into the more reactive oxirane moiety by reaction with peracids or peroxides, which have formed in situ. [8] Biodiesel is produced from vegetable oil for diesel engines.…”

Influence of aging medium on recovery behaviors of CR/NR composite from circular deformation

“…CR/NR blends have displayed good weather resistance in several studies. [13][14][15][16][17][18] was changed into a circular form by fixing both ends of the sample with a pin. Third, the circularly deformed samples were aged at 70, 80, 90, and 95 o C for 1, 3, 7, 14, 21, and 30 days in a convection oven.…”