Properties and suitability of bark extractives from Larix leptolepsis as a bonding agent
1988
Oh, J.D. | Ahn, W.Y. (Seoul National Univ., Suwon (Korea R.). Coll. of Agriculture)
The experiment was carried out to investigate the properties of bark extractives from Larix leptolepsis and to evaluate their suitability as a bonding agent. The yield and reactivity were measured to examine the influence of temperature and time and the effect of carbonation and sulfonation. To define the possibility of practical application was wood adhesives the viscosity and gelation time were measured at 33% concentration. As the both yield and reactivity were high, extraction for 2 hours at 80deg C was the optimal temperature and time. The highest effect achieved at 1% Na2CO3 about carbonation and 1% Ns2SO3 : NaHSO3 and 0.25% Na2SO3 about sulfonation. The sulfonation of 0.25% Na2SO3 increased the yield and reactivity most highly. By using hot water as extraction liquid increased the yield was 17.2%, whele the addition of 1% and 5% NaOH to the extraction liquid increased the yield to 38.6% and 44.6%, respectively. Hot water extracts showed the highest reactivity(68.8%). The addition of 1% and 5% NaOH led to decrease in reactivity (49.3% and 25.8%, respectively)
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