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Modified planted forest timber and preparation method thereof

A wood modification technology, applied in the direction of humidity control wood, wood processing equipment, manufacturing tools, etc., can solve the problems of difficult to guarantee product quality stability, decline in wood physical and mechanical properties, limit the application range of carbonized wood, etc., and achieve dimensional stability High performance, high mechanical properties, and improved mechanical properties

Active Publication Date: 2011-10-05
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the disadvantage is that the oil will soak into the wood and increase the weight of the wood by 50% to 70%, and the heat-treated wood has a smell of oily smoke
[0013] The above four heat treatment processes are complicated, the process conditions are harsh, the control is difficult, and the stability of product quality is difficult to guarantee. Some treatment processes also require special heat treatment media. For example, the French Rectification process requires nitrogen, and the German OHT treatment process requires oil. as a heat treatment medium
[0014] Although the dimensional stability of the wood can be improved after heat treatment modification, the equilibrium moisture content in the wood decreases, the corrosion resistance also increases, the cementation performance improves, the wood color becomes darker, and the appearance of the wood with poor appearance is improved. However, heat treatment The physical and mechanical properties of the finished wood decrease, and the strength of the wood decreases greatly, such as: the bending strength decreases, the surface wettability decreases, etc., which greatly limits the application range of carbonized wood

Method used

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  • Modified planted forest timber and preparation method thereof
  • Modified planted forest timber and preparation method thereof
  • Modified planted forest timber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. Preparation of impregnation solution stock solution

[0054] 1) Prepare the main agent of impregnating liquid

[0055] A) Prepare the raw materials according to the following proportions by weight

[0056] Melamine 350g

[0057] Methanol 220g

[0058] Formaldehyde 520g

[0059] Urea 170g

[0060] Wherein: the mass percentage concentration of formaldehyde is 37%~40%; The mass percentage concentration of methanol is 99.5%;

[0061] B) adding melamine and formaldehyde into the reactor, stirring evenly, adding a sodium hydroxide solution with a concentration of 20% by mass, and adjusting the pH value of the mixed solution of melamine and formaldehyde to 9.2;

[0062] C) heating, raising the temperature of the reactor and keeping it at 80°C, and reacting at this temperature for 40 minutes to obtain a reaction solution;

[0063] D) reduce the temperature of the reaction solution in the reactor and keep it at 70° C., then add a sodium hydroxide solution with a mass pe...

Embodiment 2

[0085] 1. Preparation of impregnation solution stock solution

[0086] 1) Prepare the main agent of impregnating liquid

[0087] A) Prepare the raw materials according to the following proportions by weight

[0088] Melamine 470g

[0089] Methanol 170g

[0090] Formaldehyde 540g

[0091] Urea 50g

[0092] Wherein: the mass percentage concentration of formaldehyde is 37%~40%; The mass percentage concentration of methanol is 99.5%;

[0093] B) Adding melamine and formaldehyde into the reaction kettle, stirring evenly, adding a sodium hydroxide solution with a mass percent concentration of 20%, adjusting the pH value of the mixed solution of melamine and formaldehyde to 9.0;

[0094] C) heating, raising the temperature of the reactor and keeping it at 75°C, and reacting at this temperature for 50 minutes to obtain a reaction solution;

[0095] D) reduce the temperature of the reaction solution in the reactor and keep it at 65°C, then add a sodium hydroxide solution with a c...

Embodiment 3

[0117] 1. Preparation of impregnation solution stock solution

[0118] 1) Prepare the main agent of impregnating liquid

[0119] A) Prepare the raw materials according to the following proportions by weight

[0120] Melamine 400g

[0121] Methanol 240g

[0122] Formaldehyde 500g

[0123] Urea 120g

[0124] Wherein: the mass percentage concentration of formaldehyde is 37%~40%; The mass percentage concentration of methanol is 99.5%;

[0125] B) adding melamine and formaldehyde into the reaction kettle, stirring evenly, adding a sodium hydroxide solution with a mass percentage concentration of 20%, and adjusting the pH value of the mixed solution of melamine and formaldehyde to 9.5;

[0126] C) heating, raising the temperature of the reactor and keeping it at 82° C., reacting at this temperature for 30 minutes to obtain a reaction solution;

[0127] D) After reducing the temperature of the reaction solution in the reactor and keeping it at 75° C., adding a sodium hydroxide ...

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Abstract

The invention discloses impregnation reinforcement-thermal treatment modifying technology for planted forest timber. The technology comprises the following steps in order: 1) impregnating the timber by adopting impregnation liquid which uses modified urea resin as a main agent of the impregnation liquid; and 2) thermally treating the impregnated timber in vacuum. The timber prepared by the methodhas high dimensional stability and high strength; the bulking resistance and the corrosion resistance of the timber are improved; the added value of the thermally-treated timber is improved; and the application range of the thermally-treated timber is expanded.

Description

technical field [0001] The invention relates to a wood modification treatment method, in particular to a wood impregnation-heat treatment method. Background technique [0002] With the development of the country's economic construction and the improvement of people's living standards, people's demand for wood is increasing. The implementation of natural forest protection projects has made the contradiction between supply and demand of timber more prominent. In order to alleviate the contradiction between supply and demand, my country has built a large area of ​​industrial plantation. Although the artificial forest wood has the advantages of fast growth and high yield, the physical and mechanical properties of the artificial fast-growing forest wood are poor, the density is low, the material is soft, and it is easy to shrink and deform. [0003] In order to expand the application range of artificial forest timber and improve the economic value of artificial forest timber, p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K1/00B27K3/08
Inventor 刘君良柴宇博阳财喜秦韶山刘焕荣孙柏玲王雪花
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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