Method for manufacturing formaldehyde-free straw fiber board

A straw fiber and manufacturing method technology, applied in the field of formaldehyde-free fiberboard manufacturing, can solve the problems of fiberboard physical strength, poor water resistance and environmental protection performance, waste of materials and power, high release of free formaldehyde, etc., to improve physical and mechanical properties , Improve the effect of high added value and reduce environmental pollution

Inactive Publication Date: 2012-12-12
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of fiberboard, there are several technical problems in the existing dry-process fiberboard production process: the release of free formaldehyde in the product is too high, it is difficult to meet the environmental protection requirements; after hot pressing, there is a thick pre-cured layer on the board surface that requires sand In addition, it causes waste of materials and power, which is not conducive to the production of medium and thin MDF; the products generally do not have flame retardancy, and the added flame retardants are generally toxic and cannot be reduced, which affects the performance of the product
The common disadvantage of these preparation technologies and processes is that the fibers are not treated, and the physical properties of the fiberboards are not improved by using the chemical bonds that the fibers themselves can form. They simply improve the performance of the fiberboards by adding binders. The physical strength, water resistance and environmental protection performance of fiberboard are poor
[0004] US 2011/0009530 A1 "Formaldehyde-free Binders for Producing Wood

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Treatment of wheat straw CMP pulp: Add 1200g of wheat straw CMP dry fiber to NaAc-HAc buffer solution (pH value 4.5) to dilute the slurry into a wheat straw fiber suspension with a mass concentration of 4%. Under constant temperature conditions, use an electric mixer to fully stir and mix the fiber suspension, add 20% industrial lignin and 1% paraffin emulsion of the dry wheat straw pulp, and then add 20U / g laccase to start the reaction. Time 2h, constant stirring and constant temperature treatment during this process. In order to ensure that there is enough oxygen for the laccase activation reaction, an air pump is used to feed air into the fiber suspension during the constant temperature treatment.

[0018] (2) Fibreboard molding process: The treated pulp is broken up by an electric mixer, and the fibreboard is pressed by a wet process. First, it is formed in a fiberboard former, and then pre-pressed by a cold press to remove excess moisture, and then hot-pressed...

Embodiment 2

[0022](1) Treatment of wheat straw CMP pulp: 1200g of wheat straw CMP dry fiber was added to NaAc-HAc buffer solution (pH value 3.5) to dilute the slurry into a wheat straw fiber suspension with a mass concentration of 5%. Under constant temperature conditions, use an electric mixer to fully stir and mix the fiber suspension, add 15% industrial lignin and 2% paraffin emulsion of the dry wheat straw pulp, and then add laccase 25U / g to start the reaction. 2h, constant stirring and constant temperature treatment during this process. In order to ensure that there is enough oxygen for the laccase activation reaction, an air pump is used to feed air into the fiber suspension during the constant temperature treatment.

[0023] (2) Fibreboard molding process: The treated pulp is broken up by an electric mixer, and the fibreboard is pressed by a wet process. First, it is formed in a fiberboard former, and then pre-pressed by a cold press to remove excess moisture, and then hot-pressed...

Embodiment 3

[0027] (1) Treatment of wheat straw CMP pulp: 1200g of wheat straw CMP dry fiber was added to NaAc-HAc buffer solution (pH value 4.0) to dilute the slurry into a wheat straw fiber suspension with a mass concentration of 6%. Under constant temperature conditions, use an electric mixer to fully stir and mix the fiber suspension, then add 10% industrial lignin and 3% paraffin emulsion of the dry wheat straw pulp, and then add laccase 30U / g to start the reaction. 3h, stirring and constant temperature treatment during this process. In order to ensure that there is enough oxygen for the laccase activation reaction, an air pump is used to feed air into the fiber suspension during the constant temperature treatment.

[0028] (2) Fibreboard molding process: The treated pulp is broken up by an electric mixer, and the fibreboard is pressed by a wet process. First, it is formed in a fiberboard former, and then pre-pressed by a cold press to remove excess moisture, and then hot-pressed in...

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Abstract

The invention relates to a method for manufacturing formaldehyde-free straw fiber boards, comprising the following steps: adding NaAc-HAc buffer solution in wheat straw chemime chanical pulp so as to dilute the pulp into wheat straw fiber suspension liquid with mass concentration of 3-10%, stirring the wheat straw fiber suspension liquid fully and uniformly, respectively addingndustrial lignin being 10-50% of i of oven-dry wheat straw pulp and wax emulsion being 1-10% of oven-dry wheat straw pulp, then adding 10U/g to 100U/g laccase to start the reaction, scattering the treated wheat straw fiber by an electric mixer, molding in a fiber molding machine and then removing redundant moisture by pre-pressing, and then forming the fiber board by hot-pressing. According to the method, lignin is selected to replace the traditional binder used in the productions of middle-density fiber board and high-density fiber board, and the formaldehyde diffusion is inexistent due to the fact that the formaldehyde based binder is unused. The method of the invention is reasonable and simple in operation; and with the adoption of the waste materials of crops wheat stalk, straw and the like, the environment pollution can be reduced, the added value of the product can be enhanced, and the high-strength formaldehyde-free environment-friendly fiber boards are manufactured.

Description

technical field [0001] The invention relates to a method for manufacturing a formaldehyde-free fiberboard made from straw. Background technique [0002] In the production process of fiberboard, there are several technical problems in the existing dry-process fiberboard production process: the release of free formaldehyde in the product is too high, it is difficult to meet the environmental protection requirements; after hot pressing, there is a thick pre-cured layer on the board surface that requires sand In addition, it causes waste of materials and power, which is not conducive to the production of medium and thin MDF; the products generally do not have flame retardancy, and the added flame retardants are generally toxic and cannot be reduced, which affects the performance of the product. [0003] US 2006 / 0127659 A1 "Preparation Process of Medium Density Fiberboard" (MDF Press Technology) disclosed by the US patent, CN201998287U "High Flame Retardancy Bamboo Fiberboard" di...

Claims

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Application Information

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IPC IPC(8): D21J1/16
Inventor 王磊谢益民杜娜龙毅刘瑾杨海涛姚兰王鹏范建云
Owner HUBEI UNIV OF TECH
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