Method for preparing compact wood through synergistic effect of chemical pretreatment and hot pressing

Abstract

The invention discloses a method for preparing compact wood through the synergistic effect of chemical pretreatment and hot pressing. The method comprises the following steps: immersing with an alkaline solution, and treating under water bath heating conditions to obtain alkali-treated wood; respectively cleaning the alkali-treated wood with an acid solution and deionized water to obtain chemically-treated wood, storing the chemically-treated wood in water, covering the surface of the wood with tinfoil, putting the wood into a hot press, stopping heating after hot pressing for a period of time, maintaining the pressure for 12-24 hours, and finally drying and storing the obtained compact wood for 12-24 hours. According to the method, hemicellulose in wood is degraded through chemical pretreatment; meanwhile, wood cell walls are swelled to a certain extent; the lignin groups are activated, so that cell walls are more easily compressed, compacted and recombined; under the synergistic effect of hot pressing, wood cells are rearranged, the density of the wood is increased, and then the bending strength MOR and the bending elasticity modulus MOE of the wood are greatly increased.

Description

technical field [0001] The invention relates to the technical field of wood material modification, in particular to a method for preparing dense wood through the synergistic effect of chemical pretreatment and hot pressing. Background technique [0002] Wood compression technology is one of the effective methods to improve the strength of low-density wood. Through compression treatment, the surface or overall density of wood can be increased to achieve the purpose of increasing wood strength, which can effectively expand the application field of low-density wood. [0003] Densified wood has been widely used in production and life, but there are still some problems in the production and application of this technology, especially the environmental protection fixing technology of compression deformation is a key problem that needs to be solved. For example, wood needs to be softened before densification. Compared with physical softening and other chemical softening, lye softeni...

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Problems solved by technology

For example, wood needs to be softened before densification. Compared with physical softening and other chemical softening, lye softening has broad application prospects. In the prior art, alkali treatment usually uses NaOH or KOH to treat wood to remove part of the wood. lignin achieves the purpose of softening, but the dissolution effect of lignin is poor

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