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Preparation method of high-strength formaldehyde-free wood fiber board, fiber board and application

A wood fiberboard, high-strength technology, applied in applications, flat products, household components, etc., can solve the problems of complex process and ineffective production of formaldehyde-free fiberboard, and achieve the effect of increasing oxidation degree and improving utilization rate

Pending Publication Date: 2021-07-23
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In recent years, scientists have tried various methods such as chemical or physical pretreatment to improve the physical properties of self-bonded materials. However, these methods are very complicated and cannot effectively produce formaldehyde-free fiberboard.

Method used

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  • Preparation method of high-strength formaldehyde-free wood fiber board, fiber board and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1 (the concrete amount of the calcium chloride solution of wood waste residue, mixed solution and 10% needs to add)

[0027] A preparation method of a high-strength formaldehyde-free wood fiber board, comprising the following steps:

[0028] 1) Wood pretreatment: Weigh 10g of poplar wood waste residue, crush it to 80 mesh, immerse the wood waste residue in 10ml of a mixed solution of potassium hydroxide and sodium sulfite for one immersion, immerse at 25°C for 5h, wherein potassium hydroxide is in the mixed solution The mass percentage is 0.8%, and the mass percentage of sodium sulfite in the mixed solution is 0.8%. After the impregnation is completed, rinse once with deionized water, and carry out the TEMPO oxidation reaction at 5°C for 1h, and immerse the wood waste residue in 10ml of 10% mass percentage of chlorine Carry out secondary impregnation in calcium chloride solution, immerse at 20°C for 5 hours, after the impregnation is completed, take out the w...

Embodiment 2

[0031] Embodiment 2 (the concrete amount of the calcium chloride solution of wood residue, mixed solution and 10% needs to add)

[0032] A preparation method of a high-strength formaldehyde-free wood fiber board, comprising the following steps:

[0033] 1) Wood pretreatment: Weigh 10g of poplar wood waste residue, crush it to 80 mesh, immerse the wood waste residue in 10ml of a mixed solution of potassium hydroxide and sodium sulfite for one immersion, immerse at 25°C for 5h, wherein potassium hydroxide is in the mixed solution The mass percentage is 0.5%, and the mass percentage of sodium sulfite in the mixed solution is 0.3%. After the impregnation is completed, rinse once with deionized water, and carry out the TEMPO oxidation reaction at 5°C for 1h, and immerse the wood waste residue in 10ml of 20% chlorine by mass. Carry out secondary impregnation in calcium chloride solution, immerse at 20°C for 5 hours, after the impregnation is completed, take out the wood waste residu...

Embodiment 3

[0036] Embodiment 3 (the specific amount of the calcium chloride solution of wood residue, mixed solution and 10% needs to add)

[0037] A preparation method of a high-strength formaldehyde-free wood fiber board, comprising the following steps:

[0038] 1) Wood pretreatment: Weigh 10g of poplar wood waste residue, crush it to 80 mesh, immerse the wood waste residue in 10ml of a mixed solution of potassium hydroxide and sodium sulfite for one immersion, immerse at 25°C for 5h, wherein potassium hydroxide is in the mixed solution The mass percentage is 2%, and the mass percentage of sodium sulfite in the mixed solution is 1%. After the impregnation is completed, rinse once with deionized water, and carry out TEMPO oxidation reaction at 5°C for 1h, and immerse the wood waste residue in 10ml of 25% chlorine by mass percentage. Carry out secondary impregnation in calcium chloride solution, immerse at 20°C for 5 hours, after the impregnation is completed, take out the wood waste res...

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Abstract

The invention belongs to the technical field of artificial boards, and particularly relates to a preparation method of a high-strength formaldehyde-free wood fiber board, the fiber board and application. The preparation method comprises the following steps of S1, wood pretreatment, wherein after poplar waste is crushed, two-step dipping with a mixed solution of potassium hydroxide and sodium sulfite and a calcium chloride solution, high-temperature treatment and drying for later use are carried out; S2, pre-pressing and forming; and S3, hot pressing for board forming. The mixed solution of potassium hydroxide and sodium sulfite is used for treating cellulose in wood waste residues, decomposition and hydrolysis of hemicellulose, lignin and the like are accelerated, TEMPO is used for oxidizing the cellulose, the oxidation degree is improved, calcium ions and cellulose nanofibers are crosslinked, the self viscosity is improved, and hot pressing forming of the fiber board is facilitated.

Description

technical field [0001] The invention belongs to the technical field of wood-based panels, and in particular relates to a preparation method of a high-strength formaldehyde-free wood fiber board, the fiber board and its application. Background technique [0002] Fiberboard is a wood-based panel made by interweaving lignocellulosic fibers and utilizing its inherent adhesive properties. Adhesives or additives can be applied during the manufacturing process. The production of traditional fiberboard is usually bonded with adhesives, mainly including phenolic resin and urea-formaldehyde resin. The fiberboard made of this type of adhesive will release free formaldehyde for a long time during its storage and use. With the development of the economy and the improvement of people's living standards, people's awareness of the harm caused by free formaldehyde has also increased rapidly. If you want to fundamentally solve the problem of free formaldehyde release from fiberboards, the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N1/00B27N3/04B27N3/12B27L11/08
CPCB27N1/00B27N3/04B27N3/12B27L11/08
Inventor 葛省波叶浩然李城夏常磊李建章姜帅成韦妍蔷罗永宏
Owner NANJING FORESTRY UNIV
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