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Fabricating method of formaldehyde-free wheat straw medium density fiberboard

A manufacturing method and technology of fiberboard, applied in fiberboard, papermaking, textiles and papermaking, etc., can solve the problems of difficulty in taking into account the physical strength and environmental performance of fiberboard, the strength of fiberboard, poor water resistance and environmental protection performance, and large limitations, etc., to achieve Improve physical and mechanical properties, solve free formaldehyde pollution, and have good water resistance

Inactive Publication Date: 2012-10-31
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These preparation technologies and processes do not process the fibers, do not use the chemical bonds of the fibers themselves to improve the performance of the fiberboard, but only improve the performance of the fiberboard by adding adhesives, and the prepared fiberboard has relatively high strength, water resistance and environmental protection. Difference
[0004] US 2011 / 0009530 A1 "Formaldehyde-free Binders for Producing Wood Products" published in US Patent, US 7722712 B2 "Preparation of Formaldehyde-free Binders Based on Wood Fiber" (Formaldehyde-free Binders for Producing Wood Products) published in US Patent -free Adhesives and Lignocellular Composites Made From the Adhesives), Chinese patent publication CN101791817A "Environmentally friendly low-cost medium and high density fiberboard production method", Chinese patent publication CN201998256U "Formaldehyde-free furniture fiberboard", Chinese patent publication CN1410498 "Man-made board Water-based copolymer adhesive and its preparation method", Chinese patent publication CN102304346A "Preparation and use method of a formaldehyde-free protein-based wood adhesive", all of which are bonded by adding chemical substances such as phenolic formaldehyde, urea-formaldehyde, and gelatin The physical properties of the fiberboard are improved by using additives, it is simply bonded, no chemical reaction is involved in the hot pressing process, it is difficult to take into account the physical strength and environmental performance of the fiberboard, and the application is very limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Treatment of wheat straw CMP pulp: dry 1400g of wheat straw CMP pulp, the mass concentration of wheat straw pulp is 20%, and the beating degree is 10 o SR, adding NaAc-HAc buffer solution (pH4.0) to dilute the slurry into a wheat straw fiber suspension with a mass concentration of 4%, and fully stir the fiber suspension with an electric mixer at a constant temperature of 30°C , add 2% coniferyl alcohol-β-D-glucoside, 0.1% β-glucosidase, 2% pectin colloid and 3% cationic paraffin emulsion of the quality of dry wheat straw pulp respectively, and then The reaction was started by adding 30U / g laccase, and the reaction time was 3h. During this process, constant stirring and constant temperature treatment were carried out. In order to ensure enough oxygen for the reaction of laccase-activated wheat straw fiber with lignin precursor and pectin, an air pump was used to feed air into the wheat straw fiber suspension during the constant temperature treatment.

[0017] (2) Wh...

Embodiment 2

[0021] (1) Treatment of wheat straw CMP pulp: dry 1400g of wheat straw CMP pulp, the mass concentration of wheat straw pulp is 10%, and the beating degree is 20 o SR, adding NaAc-HAc buffer solution (pH3.0) to dilute the slurry into a wheat straw fiber suspension with a mass concentration of 2%, and fully stir the fiber suspension with an electric mixer at a constant temperature of 50°C. Add 4% coniferyl alcohol-β-D-glucoside, 0.2% β-glucosidase, 4% cooled pectin colloid and 2% cationic paraffin emulsion of the quality of dry wheat straw pulp, and then add 50U / g laccase to start the reaction, the reaction time is 2h, during this process, constant stirring and constant temperature treatment. In order to ensure enough oxygen for the reaction of laccase-activated wheat straw fiber with lignin precursor and pectin, an air pump was used to feed air into the wheat straw fiber suspension during the constant temperature treatment.

[0022] (2) Wheat straw fiberboard molding process:...

Embodiment 3

[0026] (1) Treatment of wheat straw CMP pulp: dry 1400g of wheat straw CMP pulp, the mass concentration of wheat straw pulp is 25%, and the beating degree is 15 o SR, add NaAc-HAc buffer solution (pH2.5) to dilute the slurry into a wheat straw fiber suspension with a mass concentration of 8%, and use an electric mixer to fully stir the fiber suspension at a constant temperature of 40°C. Add 6% coniferyl alcohol-β-D-glucoside, 0.3% β-glucosidase, 6% cooled pectin colloid and 1% cationic paraffin emulsion of the quality of dry wheat straw pulp, and then add 20U / g laccase to start the reaction, the reaction time is 2h, during this process, constant stirring and constant temperature treatment. In order to ensure enough oxygen for the reaction of laccase-activated wheat straw fiber with lignin precursor and pectin, an air pump was used to feed air into the wheat straw fiber suspension during the constant temperature treatment.

[0027] (2) Wheat straw fiberboard molding process: ...

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Abstract

The invention relates to a fabricating method of a formaldehyde-free wheat straw medium density fiberboard, which comprises the following steps: wheat straw chemical-mechanical pulp is added with NaAc-HAc buffer to dilute pulp into wheat straw fiber suspension with mass concentration of 2-10%; coniferol-beta-D-glucoside that is 1-10% of oven dry wheat straw pulp, 0.05-0.5% of beta-glucosidase with concentration of 6.3u / mg, 1-12% of pectin colloid and 1-8% of cationic paraffin emulsion are respectively added in the suspension; and then, 10U / g-80U / g of laccase is added in the suspension to start reaction; the processed wheat straw fiber is scattered through an electric mixer; a fiberboard former is used to shape the fiberboard; excess water is removed by prepressing; and at last the fiberboard is obtained by hot pressing. By virtue of the fabricating method, the physical mechanical property and water-resistant performance of the wheat straw medium intensity fiberboard are improved; the pollution problem of free formaldehyde generated during the process of artificial board production and utilization is solved; waste materials such as crop wheat straw can be utilized; and the environment pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of artificial board production, and in particular relates to a method for manufacturing formaldehyde-free wheat straw medium density fiberboard. Background technique [0002] Among wood adhesives, the most used are urea formaldehyde resin (Urea Formaldehyde Resin, UF), phenolic resin (Phenolic Formaldehyde Resin, PF) and melamine formaldehyde resin (Melamine Formaldehyde Resin, MF) adhesives, in addition, polyurethane (Polyurethane, PU) adhesive demand is also increasing. However, the raw materials of the above four kinds of adhesives all come from non-renewable petroleum products, and at the same time, urea-formaldehyde resin (UF), phenolic resin (PF) and melamine-formaldehyde resin (MF) adhesives will release free formaldehyde during use. , thus bringing about the problem of formaldehyde pollution. [0003] US 2006 / 0127659 A1 "Preparation Process of Medium Density Fiberboard" (MDF Press Technology), Chin...

Claims

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Application Information

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IPC IPC(8): D21J1/00D21J1/04D21H11/12D21H17/60
Inventor 王磊谢益民刘瑾龙毅杜娜杨海涛姚兰王鹏范建云
Owner HUBEI UNIV OF TECH
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