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Wood spring and preparation method thereof

A technology of wood and lignin, which is applied in the direction of springs, wood processing equipment, manufacturing tools, etc., can solve the problems of limited elastic limit of wood, great difficulty in interaction, complex force of fiber, etc., and achieves improved fatigue limit and wide elastic range , the effect of increasing strength

Active Publication Date: 2021-01-05
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difficulty in regulating the interaction between nanofibers, the force between fibers is relatively complex, and the elastic limit of wood itself is limited, so it is still difficult to prepare wood springs.

Method used

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  • Wood spring and preparation method thereof
  • Wood spring and preparation method thereof
  • Wood spring and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Basswood with a height of 30cm 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 it in N,N-dimethylacetamide solution, keep it at 165°C for 40 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 40 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, then roll it, shape and dry it into a wood coil spring, and the tensile strength along the grain is 422MPa. The timber spring that present embodiment prepares is as figure 2 As shown, it can be seen that it has good elastic function and can replace metal springs in industrial applications.

Embodiment 2

[0033] Put the 30cm high, 2mm long, and 1mm thick basswood into 30% hydrogen peroxide for 2 hours, wash off excess chemicals with water, and then dry. Then put in N,N-dimethylacetamide solution, keep at 160°C for 30 minutes, then cool to 110°C, add a certain amount of lithium chloride, lithium chloride:N,N-dimethylacetamide solution=1 : 9, reacted for 60 minutes, after taking it out, let it stand for 10 hours, after taking it out, immerse in water for 5 hours, then wash it repeatedly with deionized water, then roll it, shape it and dry it into a wood helical compression spring, and its tensile strength along the grain is about 375 MPa.

Embodiment 3

[0035] A 30cm-high, 1mm-diameter Pinus sylvestris was cooked under high temperature and high pressure in water for 10 hours, washed with water and then dried. The sample was mixed in lithium chloride / DMAc=8g:100ml solution, and reacted at a temperature of 165°C for 60 minutes. The resulting mixed system was left to stand for 10 hours, and then washed with deionized water several times, then rolled, shaped and dried into a wood spiral tension spring, and its tensile strength along the grain was about 401MPa.

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Abstract

The invention discloses a wood spring and a preparation method thereof. The spring is formed by bending wood, the wood is of a compact structure formed by tightly arranging wood cell units, and the wood cell units are of a solid structure composed of nano cellulose fibers. The preparation method comprises the steps that firstly, wood with part of lignin removed is obtained through a lignin removing technology, then the wood is treated in an N, N-dimethylacetamide / lithium chloride solution, and the wood is subjected to rotating, twisting, shaping and drying to obtain the wood spring. The wood spring is prepared for the first time, and has the characteristics of adjustable elasticity range, excellent environmental friendliness, simple whole preparation process, low energy consumption, suitability for various wood varieties and the like, thereby having a wide application range.

Description

technical field [0001] The invention relates to a wood spring and a preparation method thereof, belonging to artificial microstructure materials, ecological materials and preparation technologies thereof. Background technique [0002] Wood is the most widely used traditional material, especially in home furnishing, construction, ships, transportation, etc. However, wood is a rigid material, has no plasticity, and cannot be bent, so it is difficult to be used as an elastic member. Steel, alloy, plastic, etc. are currently the most widely used materials for preparing elastic components, but the preparation of springs from metal materials is complicated and costly, while spring products made of plastics have limited elastic range and are non-degradable. Therefore, an environmentally friendly , materials that can be prepared into elastic members are urgently needed. Natural wood is an environmentally friendly material. If wood can be prepared as a spring material, the applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F1/364B27M1/08
CPCF16F1/364B27M1/08
Inventor 祝名伟黄大方陈延峰
Owner NANJING UNIV
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