A kind of environment-friendly high-strength heat-treated rubber wood and its modification method

A rubber wood, high-strength technology, applied in the direction of wood heat treatment, wood treatment, wood treatment details, etc., can solve the problems of shortening the thermal degradation time of wood in the high temperature stage, reducing the strength of modified wood, etc., to reduce the degree of thermal decomposition and The effect of energy consumption, prevention of strength loss, accurate control

Active Publication Date: 2021-03-30
SOUTH CHINA AGRI UNIV
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Problems solved by technology

In the process of high-temperature thermal modification, the method adopts the method of controlling the heating rate of the medium and the wood core layer in the heating stage and the cooling rate in the cooling stage, which greatly shortens the thermal degradation time of wood in the high temperature stage, thereby reducing the strength. The purpose of loss, overcomes the pollution problem existing in the prior art and the technical problem that the obtained modified wood strength reduces excessively

Method used

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  • A kind of environment-friendly high-strength heat-treated rubber wood and its modification method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In this example, Thai rubber wood is modified, and the density of rubber wood used is 0.7g / cm 3 , the moisture content is 14%. The compressive strength along the grain is 47.92MPa, and the screw holding force is 2271.43N.

[0029] (1) Drying stage: the temperature of the dry bulb in the kiln rises from room temperature to 120°C, and the heating rate is 30°C / h; the temperature of the wood core layer rises from room temperature to 110°C, and the heating rate is 25°C / h; the heating process guarantees The temperature difference between the dry bulb and the wet bulb is 20°C, and the temperature difference between the dry bulb temperature and the wood core layer is 10°C.

[0030] (2) Humidity conditioning stage: the wet bulb temperature is rapidly raised to 104°C, the dry bulb temperature is kept at 120°C, and the wood core temperature is kept at 120°C.

[0031] (3) Heating stage: the dry bulb temperature in the kiln continues to rise to 210°C, with a heating rate of 25°C / h...

Embodiment 2

[0040] In this example, Thai rubber wood is modified, and the density of rubber wood used is 0.72g / cm 3 , and the moisture content is 13.6%. The compressive strength along the grain is 49.34MPa, and the screw holding force is 2319.21N.

[0041] (1) Drying stage: the temperature of the dry bulb in the kiln rises from room temperature to 120°C, and the heating rate is 25°C / h; the temperature of the wood core layer rises from room temperature to 110°C, and the heating rate is 25°C / h; the heating process guarantees The temperature difference between the dry bulb and the wet bulb is 20°C, and the temperature difference between the dry bulb temperature and the wood core layer is 10°C.

[0042] (2) Humidity conditioning stage: the wet bulb temperature is rapidly raised to 104°C, the dry bulb temperature is kept at 120°C, and the wood core temperature is kept at 120°C.

[0043] (3) Heating stage: the dry bulb temperature in the kiln continues to rise to 200°C, with a heating rate of...

Embodiment 3

[0050] This method is used to modify Thai rubber wood. The density of rubber wood used is 0.73g / cm 3 , and the moisture content is 12.9%. The compressive strength along the grain is 48.69MPa, and the screw holding force is 2274.03N.

[0051] (1) Drying stage: the temperature of the dry bulb in the kiln rises from room temperature to 120°C, and the heating rate is 22°C / h; the temperature of the wood core layer rises from room temperature to 110°C, and the heating rate is 21°C / h; the heating process guarantees The temperature difference between the dry bulb and the wet bulb is 20°C, and the temperature difference between the dry bulb temperature and the wood core layer is 7°C.

[0052] (2) Humidity conditioning stage: the wet bulb temperature is rapidly raised to 103°C, the dry bulb temperature is kept at 120°C, and the wood core layer temperature is kept at 120°C.

[0053] (3) Heating stage: the dry bulb temperature in the kiln continues to rise to 190°C with a heating rate ...

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Abstract

The invention discloses an environmentally-friendly high-strength heat-treated rubber wood and a modification method thereof. The environmentally-friendly high-strength heat-treated rubber wood has acolor difference of delta-E * of 18 to 30, a density of 0.62 to 0.68 g / cm3, a water content of 6% to 6.3%, a parallel-to-grain compressive strength of 38 to 45 MPa and a screw-holding power of 1800 to2200 N. The method provided by the invention comprises the following steps in six stages: drying, humidity regulation, heating, heat preservation, cooling with low loss of strength and high efficiency, and cooling. According to the invention, the loss of strength can be effectively controlled under the premise that the dimensional stability of wood is greatly improved, and a high-strength heat-treated material is prepared; meanwhile, the method has the advantages of no chemical pollution in the process of treatment, high production efficiency, low cost, simple operation, high efficiency and environmental protection; the dimensional stability and decorative performance of the wood are improved; the disadvantage of low strength of heat-treated wood is overcome at the same time; and the environmentally-friendly high-strength heat-treated rubber wood provided by the invention can be widely applied to the industry of wood products like solid wood floors, solid wood furniture and solid wooddoors.

Description

technical field [0001] The invention belongs to the technical field of wood modification and wood product production technology, and more specifically relates to an environment-friendly high-intensity heat-treated rubber wood and a modification method thereof. Background technique [0002] High-temperature heat treatment, also known as carbonization treatment, usually refers to the treatment of wood under high-temperature conditions (160-250°C) with normal pressure superheated steam, inert gas, hot oil, etc. The process method of modification treatment. Moreover, high-temperature heat treatment, as a method of physical active modification, does not use any chemicals. By changing the chemical composition and biological structure of wood, it can effectively improve the moisture absorption of wood, improve the dimensional stability of wood, and enhance the decorative performance through thermal color change. It is an efficient and environmentally friendly wood modification tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K1/00B27K5/00
CPCB27K1/00B27K5/00B27K5/0085
Inventor 涂登云赵湘玉陈川富关丽涛云虹章伟伟
Owner SOUTH CHINA AGRI UNIV
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