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100			_aWang Y Z
245		0	_aInfluences of coagulam maturation time of rubber latex coagulated with formic acid and microorganism on the effective storage time of natural rubber
260			_bJournal of Rubber Research _c2014
300			_a233-244
500			_aSource Year: 2014
520			_aFresh NR latex was coagulated using formic acid and microorganism. The resulting coagula were matured at various conditions, followed by creping, size reduction and drying at 115 degree C for 5 hours. The dried coagula were then scanned using differential scanning calorimetry (DSC) and aged at various ageing times at 70 degree C. The effective storage time (i.e. storage life) of the coagula was evaluated through heat accelerated storage ageing combined with the Doyle-Ozawa equation and the heat ageing life equation. The results showed that the effective storage time of natural rubber prepared by the coagulum of fresh latex coagulated with formic acid and matured for 6, 12, 18 and 24 h respectively increased to 45.6 years from 23.2 years at 30 degree C, and increased to 100.5 years from 46.7 years at 25 degree C. The effective storage time of natural rubber prepared by the coagulum of fresh latex coagulated with microorganisms and matured for 6, 12, 18 and 24 h respectively increased to 83.3 years from 57.7 years at 30 degree C, and increased to 206.3 years from 132.8 years at 25 degree C. Both effective storage time of natural rubbers coagulated with formic acid and microorganism increased with the prolonging of coagulum maturation time. The effective storage time of NR from the coagulum matured for 6-12 h increased fast, the effective storage time of NR prepared by the coagulum matured for 12-18 h increase slowly and the increase in the effective storage time of NR prepared by the coagulum matured for 18-24 h tend to be flat. The effective storage time of natural rubber coagulated with microorganisms is obviously longer than that of natural rubber coagulated with formic acid in the same storage conditions.
650			_aAgeing
650			_aCoagulum maturation
650			_aEffective storage time
650			_aFresh latex
650			_aNatural Rubber
700			_aHuang H H
700			_aZhang B L
942			_cJS
999			_c61376 _d61376