ethiopia export rubber vulcanizing accelerator zmbt/mz
ethiopia export rubber vulcanizing accelerator zmbt/mz
ethiopia export rubber vulcanizing accelerator zmbt/mz
ethiopia export rubber vulcanizing accelerator zmbt/mz
ethiopia export rubber vulcanizing accelerator zmbt/mz
  • Why are dithiocarbamates used in vulcanization of rubber and latex?
  • Zinc salts of various dithiocarbamates are widely used as accelerators in vulcanization of dry natural rubber and latex because of the excellent properties of the vulcanizates produced. Unfortunately, dithio- carbamates, being secondary amines, produce harm- ful ^-nitrosamines.
  • Which accelerators are used in vulcanization of NR latex films?
  • Comparison of crosslink efficiencies of the accelerators ZDEC, ZMBT, DPG and ZMBT/DPG in vulcanization of NR latex films. 2.5/ig/kg for the volatile JV-nitrosamines and the nitrosatable compounds, respectively.
  • How to reduce nitrosamine formation during rubber vulcanization?
  • There are various possibilities for reducing nitrosamine formation during rubber vulcanization: the elimination of secondary amine containing accelerators [1,2], elimination of the nitrosating agent, avoidance of unfavourable reaction conditions and elimination of the formed nitrosamines [2, 3].
  • Are Nr latex films vulcanized by ZMBT/DPG?
  • It was shown that NR latex films vulcanized by a combination of accelerators ZMBT/DPG may have a similar network structure to that obtained by ZDEC. Moreover, superior mechanical properties should be expected.
  • Does ZMBT/DPG vulcanize more sulphur than ZDEC?
  • Films vulcanized by ZMBT/DPG contain less free sulphur, and this in addition to the data of crosslinking efficiency, may confirm a larger con- sumption of sulphur in these vulcanizates as compared to vulcanizates obtained by ZDEC.
  • Why do vulcanizates have low crosslink densities after ozone degradation?
  • Vulcanizates obtained by accelerator DPG maintained, relatively, the best mechanical properties, after ozone degradation. It may be speculated that the low crosslink densities of these vulcanizates may reflect the presence of long polyisoprene chains between junctions.