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›› 2007, Vol. 41 ›› Issue (2): 31-34.

• 研究报道 • Previous Articles     Next Articles

Modification of Larch Bark Tannin Extracts and Property of their Solution

CHEN Xiang-ming, CHEN He-ru, LI Wei-bin   

  1. Science Faculty, Shantou University, Shantou 515063, China
  • Received:2006-08-23 Revised:1900-01-01 Online:2007-03-30 Published:2007-03-30

Abstract: This paper illustrates the reaction of larch bark tannin extracts with sulfite and sodium hydroxide and the tests of its solution viscosity, MW-distribution and thin-layer chromatography. It shows that the solution viscosity drops and the relative molecular mass reduces with narrow distribution. The high sulfitated larch bark tannin extracts are more available to decrease the solution viscosity than the alkali treated extracts. The modified larch bark tannin extracts can be used in production of bakelite bond.

Key words: larch bark tannin extracts, modification, high sulfitation, bakelite bond

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