Effect of Defatted Rice Bran, Calcium Carbonate and Clay on Properties of Cellular Natural Rubber

Silpakorn University Science and Technology Journal Pub Date : 2016-12-31 DOI:10.14456/SUSTJ.2016.12

Darinya Moonchai, Pattaporn Juntamui, Rungtiwa Ruankum

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Abstract

The effects of defatted rice bran (DRB) as a filler for cellular natural rubber (NR) vulcanizate on its cell morphology, water absorption and mechanical properties were investigated. The properties of the DRB-filled cellular NR vulcanizate were also compared with clay-filled and CaCO 3 -filled cellular NR vulcanizates at similar loading level (30 parts per hundred of rubber). Scanning electron micrographs revealed that the greater cell size was observed when cellular NR vulcanizates were filled with all types of filler. The DRB-filled cellular NR vulcanizate exhibited better and more uniform dispersion of cellular cell structure as compared to CaCO 3 -filled and Clay-filled cellular NR vulcanizates.Moreover,the DRB-filled cellular NR vulcanizate gave the highest water absorption value, tensile strength and 100%modulus as compared to CaCO 3 -filled and Clay-filled cellular NR vulcanizates. The elongation at break of DRB-filled cellular NR vulcanizate was found to be comparable to that of CaCO 3 -filled cellular NR vulcanizate . However, the cellular NR vulcanizate filled with DRB showed the lowest hardness value.According to these observations, DRB can potentially be used as acheap and more environment-friendly natural filler for cellular natural rubber.

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脱脂米糠、碳酸钙和粘土对细胞状天然橡胶性能的影响

研究了脱脂米糠(DRB)作为多孔天然橡胶(NR)硫化胶填料对其细胞形态、吸水率和力学性能的影响。在相同的载荷水平(每百份橡胶的30份)下，将drb填充的蜂状NR硫化胶的性能与粘土填充的和碳酸钙填充的蜂状NR硫化胶进行了比较。扫描电子显微图显示，当填充所有类型的填料时，观察到更大的细胞尺寸。与caco3填充和粘土填充的蜂窝状NR硫化胶相比，drb填充的蜂窝状NR硫化胶具有更好、更均匀的细胞结构分散。此外，与碳酸钙填充和粘土填充的蜂孔式NR硫化胶相比，drb填充的蜂孔式NR硫化胶具有最高的吸水值、拉伸强度和100%模量。结果表明，drb填充的蜂泡状NR硫化胶的断裂伸长率与碳酸钙填充的蜂泡状NR硫化胶相当。而填充DRB的蜂窝状NR硫化胶的硬度值最低。根据这些观察结果，DRB有潜力作为廉价和更环保的天然填充剂用于蜂窝天然橡胶。

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Silpakorn University Science and Technology Journal

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