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Method for preparing modified wood by compounding heat treatment based on alkali lignin

A composite heat treatment and alkali lignin technology, which is applied in the field of modified wood based on alkali lignin composite heat treatment, can solve the problems of low activity and limitation of alkali lignin, and achieve the effects of increasing added value, low cost and slowing down water absorption.

Inactive Publication Date: 2018-05-01
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the utilization of alkali lignin is limited due to its low activity

Method used

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  • Method for preparing modified wood by compounding heat treatment based on alkali lignin
  • Method for preparing modified wood by compounding heat treatment based on alkali lignin
  • Method for preparing modified wood by compounding heat treatment based on alkali lignin

Examples

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Embodiment 1

[0037] This embodiment provides a method based on alkali lignin composite heat treatment modified wood, the processing material is poplar, a fast-growing wood, cut into 20*20*20mm 3 , including the following steps:

[0038] 1) Dissolve 30 parts of alkali lignin in 500 parts of 1,4-dioxane solution, and stir for 2 hours with a magnetic stirrer to obtain an alkali lignin solution; filter the alkali lignin solution to remove excess Alkali lignin and impurities to obtain filtered alkali lignin solution;

[0039] 2) Put the poplar in the impregnation tank, under the condition of vacuum degree of -0.9MPa, after vacuum treatment for 30min, stop the vacuum, and add 1,4-dioxane of alkali lignin into the impregnation tank solution, adjust the pressure to 0.4MPa, and keep the pressure for 60min;

[0040] 3) Take out the soaked poplar, dry it naturally for 1 day until it is air-dried, then put it in a drying oven, and dry it at 100°C until it is absolutely dry; then place it at 140°C an...

Embodiment 2

[0042] This embodiment provides a method based on alkali lignin composite heat treatment modified wood, the processing material is poplar, a fast-growing wood, cut into 20*20*20mm 3 , including the following steps:

[0043] 1) Dissolve 35 parts of alkali lignin in 550 parts of 1,4-dioxane solution, and stir for 3 hours with a magnetic stirrer to obtain an alkali lignin solution; filter the alkali lignin solution to remove excess Alkali lignin and impurities to obtain filtered alkali lignin solution;

[0044] 2) Put the poplar in the impregnation tank, under the condition of vacuum degree of -0.9MPa, after vacuum treatment for 35 minutes, stop the vacuum, and add 1,4-dioxane of alkali lignin into the impregnation tank solution, adjust the pressure to 0.5MPa, and keep the pressure for 70min;

[0045] 3) Take out the soaked poplar wood, dry it naturally for 2 days to air-dry state, then put it into a drying box, and dry it to a dry state at a temperature of 103°C; then place it...

Embodiment 3

[0047] This embodiment provides a method based on alkali lignin composite heat treatment modified wood, the processing material is poplar, a fast-growing wood, cut into 20*20*20mm 3 , including the following steps:

[0048] 1) Dissolve 40 parts of alkali lignin in 550 parts of 1,4-dioxane solution and stir for 3 hours with a magnetic stirrer to obtain an alkali lignin solution; filter the alkali lignin solution to remove excess Alkali lignin and impurities to obtain filtered alkali lignin solution;

[0049] 2) Put the poplar in the impregnation tank, under the condition of vacuum degree of -1.0MPa, after vacuum treatment for 35min, stop the vacuum, and add 1,4-dioxane of alkali lignin into the impregnation tank solution, adjust the pressure to 0.5MPa, and keep the pressure for 60min;

[0050] 3) Take out the soaked poplar wood, dry it naturally for 2 days until it is air-dried, then put it in a drying oven, and dry it until it is absolutely dry at a temperature of 105°C; the...

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Abstract

The invention relates to a method for preparing modified wood by compounding heat treatment based on alkali lignin. The method comprises the following steps: (1) soaking the wood treated in vacuum ina 1,4-dioxane solution with alkali lignin, adjusting the pressure to 0.2-0.8MPa and retaining the pressure for 50-90 minutes; and (2) taking the wood soaked in the step (1) out, drying the wood, putting the wood under the condition at the temperature of 120-200 DEG C, and carrying out heat treatment for 1.5-4 hours to obtain the modified wood. The method is used as a non-toxic and long-acting woodmodification manner with low cost and simple process; the modified wood with high water resistance and high size stability is prepared by compounding a heat treatment method; the defects of high possibility of cracking and high possibility of deformation of the fast-growing wood can be effectively overcome; the bottleneck problem of utilization of the fast-growing wood at present can be solved.

Description

technical field [0001] The invention belongs to the technical field of wood function improvement, and in particular relates to a method for modifying wood based on alkali lignin composite heat treatment. Background technique [0002] With the development of social economy and the increasing awareness of environmental protection, as the only sustainable biomass material among the four major materials, the advantages of wood are becoming more and more obvious, and the usage is increasing year by year. However, wood is a natural hygroscopic material, and its chemical components cellulose and hemicellulose contain a large number of hydrophilic hydroxyl groups, which cause wood products to be prone to cracking, warping and other deformation problems during processing and use, shortening the service life, Utilization efficiency is reduced. Especially for loose fast-growing wood, its dimensional instability is particularly fatal, and currently it can only be used as raw materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/08B27K3/34B27K5/00B27K5/04
CPCB27K3/08B27K3/346B27K5/0085B27K5/04
Inventor 马尔妮周海珍李京予刘敏林剑虞宇翔
Owner BEIJING FORESTRY UNIVERSITY
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