A kind of wood spring and preparation method thereof

A wood and lignin technology, used in springs, wood processing appliances, manufacturing tools, etc., can solve the problems of difficult interaction, complex fiber force, limited elastic limit of wood, etc., and achieve a wide range of elasticity and improved fatigue limit. , the effect of excellent mechanical properties

Active Publication Date: 2022-06-21
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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  • A kind of wood spring and preparation method thereof
  • A kind of wood spring and preparation method thereof
  • A kind of wood spring and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The basswood with a height of 30 cm and a diameter of 1 mm was placed in a 2.0 mol / L sodium hydroxide and 0.03 mol / L sodium sulfite aqueous solution for 10 hours, and the excess chemicals were washed with water and dried. Then placed in N,N-dimethylacetamide solution, 165℃, kept for 40 minutes, then cooled to 110℃, added a certain amount of lithium chloride, lithium chloride: the mass of N,N-dimethylacetamide solution Ratio=1:8, react for 40 minutes, after taking out, stand for 24 hours, immerse in water for 10 hours, then wash with deionized water for many times, then roll, shape and dry into a wood coil spring, with a tensile strength along the grain of 422MPa. The wood spring prepared in this example is as figure 2 As shown, it can be seen that it has a good elastic function and can replace the industrial application of metal springs.

Embodiment 2

[0033] Basswood with a height of 30cm, a length of 2mm and a thickness of 1mm was placed in 30% hydrogen peroxide and boiled for 2 hours, and the excess chemicals were washed with water, and then dried. Then placed in N,N-dimethylacetamide solution, 160℃, kept for 30 minutes, then cooled to 110℃, added a certain amount of lithium chloride, lithium chloride:N,N-dimethylacetamide solution=1 : 9, react for 60 minutes, after taking it out, let it stand for 10 hours, after taking it out, immerse it in water for 5 hours, then wash it with deionized water for many times, then roll it, shape it and dry it into a wood spiral compression spring, and its tensile strength along the grain is about 375MPa.

Embodiment 3

[0035] The pine sylvestris with a height of 30cm and a diameter of 1mm was cooked in water at high temperature and pressure for 10 hours, washed with water and then dried. The sample was placed in lithium chloride / DMAc=8g: 100ml solution and mixed, and reacted at a temperature of 165°C for 60min. The obtained mixed system was allowed to stand for 10 hours, then washed with deionized water for several times, then rolled, shaped and dried to form a wood helical tension spring with a tensile strength along the grain of about 401 MPa.

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Abstract

The invention discloses a wood spring and a preparation method thereof. The spring is made of bent wood, and the wood is a dense structure formed by closely arranged wood cell units, and the wood cell unit is a solid structure composed of nanocellulose fibers. The preparation method of the present invention is as follows: firstly, through the process of removing lignin, wood with part of lignin removed is obtained, then the wood is treated in N,N dimethylacetamide / lithium chloride solution, twisted and shaped, dried, Get wood springs. The present invention has prepared a wood spring for the first time, which has an adjustable elastic range and excellent environmental friendliness. The whole preparation process is simple, low energy consumption, and can be applied to many types of wood. The prepared wood spring has a wide range of applications. .

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 household, construction, ship, transportation and so on. However, wood is a rigid material with no plasticity and cannot be bent, so it is difficult to be used as an elastic member. Rigid, alloy, plastic, etc. are currently the most widely used materials for the preparation of elastic components. However, the process of preparing springs from metal materials is complicated and the cost is high. However, spring products prepared from plastics have a limited range of elasticity and are non-degradable, so they are environmentally friendly. , materials that can be prepared into elastic members are urgently needed. Natural wood is an environmentally friendly material. If wood can be ...

Claims

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Application Information

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Patent Type & Authority Patents(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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