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A kind of high-strength cellulose/lignin composite material with reinforced concrete structure and its preparation method

A technology of reinforced concrete and composite materials, applied in fiberboard, wood treatment, wood impregnation, etc., to achieve the effects of excellent water resistance and solvent resistance, excellent mechanical properties, and wide application prospects

Active Publication Date: 2019-03-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of this transparent wood can only reach 50-100MPa, and, in the preparation process, difficult-to-biodegrade substances such as epoxy resin and methyl methacrylate are added.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Chinese fir section is cut into 50mm * 40mm * 4mm wood chips;

[0029] (2) Add wood chips into the reaction kettle containing sodium sulfite (relative to absolute dry wood chips, the addition amount is 15%), sodium hydroxide (relative to absolute dry wood chips, the addition amount is 5%) and methanol solution (concentration is 20vol%) cooking liquid In the process, the liquid ratio is 1:10, and the temperature is kept at 150°C for 2 hours. During the reaction process, no stirring is required to maintain the complete shape and structure of the wood chips;

[0030] (3) After the cooked wood chips were washed to remove the residual cooking liquid, they were dried under a pressure of 4 MPa for 4 hours to obtain a high-strength cellulose / lignin composite material with a reinforced concrete structure and a moisture content of 22%.

[0031] The high-strength cellulose / lignin composite material obtained through the above steps has a thickness of 650 μm and a density of 0.9...

Embodiment 2

[0033] (1) Chinese fir section is cut into 50mm * 40mm * 4mm wood chips;

[0034] (2) Add wood chips into the reaction kettle containing sodium sulfite (relative to absolute dry wood chips, the addition amount is 15%), sodium hydroxide (relative to absolute dry wood chips, the addition amount is 5%) and methanol solution (concentration is 20vol%) cooking liquid In the process, the liquid ratio is 1:10, and the temperature is kept at 150°C for 2 hours. During the reaction process, no stirring is required to maintain the complete shape and structure of the wood chips;

[0035] (3) After the cooked wood chips were washed to remove the residual cooking liquid, they were dried under a pressure of 4 MPa for 12 hours to obtain a high-strength cellulose / lignin composite material with a reinforced concrete structure and a moisture content of 14%.

[0036] The thickness of the high-strength cellulose / lignin composite material obtained through the above steps is 590 μm, the density is 1 ...

Embodiment 3

[0038](1) Chinese fir section is cut into 70mm * 50mm * 4mm wood chips;

[0039] (2) Add wood chips into the reaction kettle containing sodium sulfite (compared to absolute dry wood chips, the addition amount is 25%), sodium hydroxide (relative to absolute dry wood chips, the addition amount is 10%) and methanol solution (concentration is 30vol%) In the process, the liquid ratio is 1:15, and the temperature is kept at 170°C for 6 hours. During the reaction process, no stirring is required to maintain the complete shape and structure of the wood chips;

[0040] (3) After the cooked wood chips were washed to remove the residual cooking liquid, they were dried under a pressure of 6 MPa for 7 hours to obtain a cellulose / lignin composite material with a reinforced concrete structure, and the water content was 16%.

[0041] The high-strength cellulose / lignin composite material obtained through the above steps has a thickness of 200 μm and a density of 1.1 g / cm 3 , the tensile stren...

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Abstract

The invention discloses a high-strength cellulose / lignin composite material with a reinforced concrete structure and a preparation method thereof. The preparation method comprises the following steps that (1) a timber is cut into a wood chip in a needed specific shape; (2) the wood chip is soaked in a reaction kettle containing sodium sulfite, sodium hydroxide and methyl alcohol cooking liquid to be cooked; and (3) the cooked wood chip is washed with clean water, residual cooking liquid is removed, pressurization and drying are conducted, and the high-strength cellulose / lignin composite material with the reinforced concrete structure is obtained. The composite material has the reinforced concrete structure, and the tensile strength is as high as 810 MPa and is twenty times that of an original wood chip. The preparation method is simple in process, any non-biodegradable substances and environmentally harmful substances do not need to be added in the preparation process, and the preparation method is high in efficiency and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of bio-based materials, in particular to a high-strength cellulose / lignin composite material with a reinforced concrete structure and a preparation method thereof. Background technique [0002] High-strength composite materials are widely used in aerospace, automobile, construction and other fields. However, due to global problems such as the oil crisis and environmental problems, a large number of researches aim to use biomaterials to replace non-renewable petroleum-based materials to prepare high-strength composite materials to achieve sustainable development of humans and nature. Wood is the most widely used biological material. It is mainly composed of oriented cellulose fibers, lignin and hemicellulose. It has excellent mechanical properties, large reserves, renewable and biodegradable, and is an environmentally friendly material. , Widely used in furniture manufacturing, house construction and shipbuilding and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F13/00D21J1/18D21C3/06B27N3/14B27K5/00
CPCB27K3/02B27K3/52B27K5/04B27K2240/70
Inventor 方志强陈港刘宇况宇迪张俊奇
Owner SOUTH CHINA UNIV OF TECH
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