The self-bonding poplar wood MDF and its bonding mechanisms of fibers treated with active agents

Zhang Guilin; Xu Yonglan; Liu feipeng

doi:10.19455/j.mcgy.1990.03.001

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The self-bonding poplar wood MDF and its bonding mechanisms of fibers treated with active agents
1. Nanjing Forestry University
Issue 3, Pages: 2-9(1990)
DOI： 10.19455/j.mcgy.1990.03.001

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[1]张贵麟,徐咏兰,刘飞鹏.无胶杨木中密度纤维板工艺和结合机理的初步研究[J].木材工业,1990(03):2-9.

Zhang Guilin, Xu Yonglan, Liu feipeng. The self-bonding poplar wood MDF and its bonding mechanisms of fibers treated with active agents. [J]. China Wood Industry (3):2-9(1990)
[1]张贵麟,徐咏兰,刘飞鹏.无胶杨木中密度纤维板工艺和结合机理的初步研究[J].木材工业,1990(03):2-9. DOI： 10.19455/j.mcgy.1990.03.001.

Zhang Guilin, Xu Yonglan, Liu feipeng. The self-bonding poplar wood MDF and its bonding mechanisms of fibers treated with active agents. [J]. China Wood Industry (3):2-9(1990) DOI： 10.19455/j.mcgy.1990.03.001.

摘要

本研究以杨木为原料,NaOH、HNO,3,、H,2,O,2,作活化剂制造无胶中密度纤维板（MDF）。在实验参数范围内,通过数学分析得到了最优工艺条件;在温度变化条件下用电子自旋共振波谱测得的自由基浓度及其变化,对无胶胶合的结合机理进行了初步探讨。

Abstract

This paper deals with thoe self-bonding poplar wood dry-processing MDF and its bonding mechanisms of fibers treated with active agents, such as NaOH, HNO,3, and H,2,O,2,. Through mathematical analysis of the experiment, the best results have been gained between the variable ranges of parameters.The optimization conditions are as follows: 1) The ratio of active agent absolute dried weight to the oven dried weight of fibers: 2% for using NaOH as activator. 2) The ratio of gap-filling material absolute dried weight to that of fibers. 10-12%. 3)Temperature of hotpress: 220℃. 4) Time of hot press: 18 min. 5) The moisture content of dried. fibers: 7-7.5%. The optimization strengths are as follows: MOR: 25（MPa）, IB: 0.46 （MPa）, MOE: 3680 （MPa）, LS: 0.72%, THS. 9.65%, MC: 3.96%, Density: 0.78g/era,3,.The bonding mechanisms,of MDF activated with NaOH are: 1) Theeompetition reaction between the degradation and condensation reaction of lignin and gap-filling materials. 2) Bonding between semicellulose and lignin （LCC）. 3) Hydrogen bond force and the combination of free radicals.