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中南大学学报(英文版)

Journal of Central South University

Vol. 13    No. 1    February 2006

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Preparation of adhesive for bamboo plywood using
concentrated papermaking black liquor directly
WANG Yun-yan(王云燕), PENG Wen-jie(彭文杰), CHAI Li-yuan(柴立元),
PENG Bing(彭 兵), MIN Xiao-bo(闵小波), HE De-wen(何德文)

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:Adhesive for bamboo plywood prepared directly using lignin existing in the black liquor as a kind of material replacing phenol was proposed on the basis of the same structural properties of lignin and phenol. The results indicate that the reaction time of black liquor methylating is 30 min, when the ratio of alkali to formaldehyde is controlled at approximately 0.20, decomposition rate of formaldehyde is the lowest and the effect of black liquor methylating is the best, the optimal molar ratio of phenol: formaldehyde to NaOH to H2O of preparing phenolic resin is
1.00∶1.50∶0.50∶9.00, and the suitable viscosity is 27 30 Pa·s. At different mass ratios of methylated black liquor to phenolic resin, all terms of performance of black liquor phenolic resin are excellent and satisfy the requirement. All terms of performance of bamboo plywood prepared using this technique are better than that of excellent bamboo plywood of national criteria. Using this technique, the cost is depressed by 28.69% without altering the traditional adhesive producing technique flow, and without using additional equipment.

 

Key words: papermaking black liquor; lignin; bamboo plywood; adhesive

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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