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Preparation method for softening and bending wood

A technology of wood and bending, which is applied in the field of preparation of wood softening and bending, can solve the problems of difficult fiber regulation and complex wood structure, and achieve the effects of increased fatigue limit, wide range of curvature and improved plasticity

Pending Publication Date: 2021-01-01
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of wood is complex and fiber control is relatively difficult, so the research still faces great challenges

Method used

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  • Preparation method for softening and bending wood
  • Preparation method for softening and bending wood
  • Preparation method for softening and bending wood

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preparation example Construction

[0030] The invention provides a method for preparing wood softening and bending, which specifically includes the following steps:

[0031] (1) Treating the wood with the treatment solution A for 20 minutes to 72 hours to remove part of the lignin, and the removed lignin content is 10%-99%. Lignin mainly exists between fibers, which can connect cells and fibers and provide rigid support for wood. After removing part of the lignin, it can not only destroy the chemical bond between lignin and cellulose, but also provide space for the subsequent swelling and migration of cellulose fibers.

[0032] (2) The wood obtained in step (1) is treated with N,N dimethylacetamide and lithium chloride solution, so that the nanofibers in the wood swell and slide, and evenly fill in the hollow cell lumen of the wood.

[0033] The original wood structure before solution treatment as figure 1 As shown, the original wood exhibits rigid characteristics when bent, does not have plasticity and elast...

Embodiment 1

[0038] Basswood with a height of 70cm and a diameter of 1mm was placed in 2.0mol / L sodium hydroxide and 0.03mol / L sodium sulfite aqueous solution for 10 hours, and the excess chemicals were washed with water, and then dried. Then put in N,N-dimethylacetamide solution, keep at 160°C for 60 minutes, then cool to 110°C, add a certain amount of lithium chloride, lithium chloride: the mass of N,N-dimethylacetamide solution Ratio = 1:8, react for 60 minutes, take it out, let it stand for 24 hours, immerse in water for 10 hours, and then wash it with deionized water several times. At this time, the wood can be bent, even knotted, and can be set when dry. The schematic diagram of its knotted wood is shown in figure 1 , and by Figure 6 It can be seen that its tensile strength along the grain is 430MPa, which is nearly 7 times that of the original wood.

Embodiment 2

[0040] Cut pine sylvestris crosswise into thickness 3mm and diameter 10cm, put it in 2.0mol / L sodium hydroxide, 0.03mol / L sodium sulfite aqueous solution and cook for 10 hours, wash excess chemicals with water, and then dry. Then put in N,N-dimethylacetamide solution, keep at 165°C for 30 minutes, then cool to 120°C, add a certain amount of lithium chloride, lithium chloride: the mass of N,N-dimethylacetamide solution Ratio = 1:9, react for 40 minutes, take it out, let it stand for 10 hours, soak it in water for 5 hours after taking it out, and then wash it with deionized water for many times. At this time, the wood can be bent and dried into a shape Figure 4 Shown, and the tensile strength along the grain is 423MPa.

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Abstract

The invention discloses a preparation method for softening and bending wood. The preparation method comprises the following specific steps that (1) part of lignin of the wood is removed; (2) N, N-dimethylacetamide and a lithium chloride solution are used for treatment, so that micro-nano fibers in the wood swell and slide, and hollow cell cavities of the wood are evenly filled with the micro-nanofibers; (3) the redundant chemical solution is cleaned with water; (4) the cleaned wood is dried until the moisture content is 30%-100%, and then bending deformation operation can be conducted; and (5) the bent and deformed wood is dried and shaped. According to the method, a very remarkable effect is achieved when the wood is softened and bent, the mechanical property of the wood is not broken inthe treatment process and is improved by multiple times, the influence on the wood property is small, the stability is good, the wood is compact and not prone to fuzzing, and the very high utilization value is achieved.

Description

technical field [0001] The invention relates to a method for preparing wood softening and bending, and belongs to the technical fields of artificial microstructure materials and wood processing. Background technique [0002] Wood is of natural origin and is the most widely used traditional material composed of cellulose fibers. However, wood is a rigid material with poor plasticity. Under normal conditions, wood cannot be directly bent and shaped. If the wood is bent and deformed within the normal stress range, but the stress disappears and the wood deforms and recovers. When the elastic limit is exceeded, the fibers of the stressed tensile surface are broken and damaged. Therefore, it is difficult to use wood as a curved member. [0003] Since wood is a natural and environment-friendly material, if wood can be prepared into curved components, the application range of wood will be greatly expanded. The method currently used to improve the bending properties of wood is main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27H1/00B27K5/00B27K3/52B27K3/50B27K5/04
CPCB27H1/00B27K5/00B27K3/52B27K3/50B27K5/04
Inventor 祝名伟黄大方陈延峰
Owner NANJING UNIV
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