Method for manufacturing fire retardant flakeboard by activating corn straws through enzyme/mediator system

A technology of corn stalks and particle boards, applied in the direction of manufacturing tools, pretreatment of molding materials, flat products, etc., can solve the problems of low activation efficiency, low static bending strength and elastic modulus of fiberboard, and long processing time, and achieve Reduced processing time, increased enzyme activation temperature, and low cost effects

Inactive Publication Date: 2014-12-10
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Following the technology of enzyme-activated wood fiber to produce fiberboard, WU used white rot fungus to activate corn stalk to prepare glue-free corn stalk fiberboard. After 28 days of reaction, no need to add adhesive, the prepared density is 0.39g / cm 3 low-density fiberboard, but the activation efficiency is low, the processing time is long, and the static bending strength and elastic modulus of the fiberboard are low, which cannot meet the requirements of practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Raw material preparation and processing: Cut 100kg of air-dried corn stalks, cut them, divide them, remove the stalk tips, and get 85kg of corn stalk husks after peeling. 62kg of crushed corn stalks of 40-60 meshes are dried in a drier by hot air at 80-100° C., and the moisture content is controlled below 8% to obtain 54 kg of crushed corn stalks prepared finally.

[0024] 2) Enzyme liquid preparation: 650 kg of enzyme liquid with a pH of 4.0, a laccase concentration of 55 U / ml and an ABTS concentration of 3.5 mmol / L was prepared in an acetic acid / sodium acetate buffer solution. The laccase activity value used in the test is 116U / ml, and one enzyme activity unit (U) refers to the amount of enzyme required to catalyze the conversion of 1 μmol of guaiacol into the product per minute under certain reaction conditions.

[0025] 3) Enzyme activation: put 54kg of corn stalk scraps finally prepared in step 1) and 650kg of enzyme liquid in step 2) and mix them evenly in a re...

Embodiment 2

[0030] 1) Raw material preparation and processing: cut 100 kg of air-dried corn stalks by weight, divide them, remove the stalk tips, and obtain 81 kg of corn stalk skins after peeling and processing. Prepare 40-60 meshes of 52 kg by weight of corn stalk scraps, dry them in a drier with hot air at 80-100° C., and control the moisture content below 8%, to obtain 43 kg of corn stalk scraps prepared last.

[0031] 2) Enzyme liquid preparation: 550 kg of enzyme liquid with a pH of 4.5, a laccase concentration of 120 U / ml and a vanillin concentration of 6.0 mmol / L was prepared in an acetic acid / sodium acetate buffer solution. The laccase activity value used in the test is 116U / ml, and one enzyme activity unit (U) refers to the amount of enzyme required to catalyze the conversion of 1 μmol of guaiacol into the product per minute under certain reaction conditions.

[0032] 3) Enzyme activation: put 43 kg of corn stalk scraps prepared in step 1) and 550 kg of enzyme solution in step 2...

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PUM

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Abstract

The invention relates to a method for manufacturing a fire retardant flakeboard by activating corn straws through an enzyme / mediator system, and solves the problems of free formaldehyde release of the current straw artificial board, poor flame retardant property and overhigh production cost. According to the invention, the corn straws are subjected to skin-and-stalk processing and crushed by a grinder to obtain corn straw particles; the corn straw particles are pretreated by using the enzyme / mediator system to make the corn straw particles have a physical structure and a chemical substance with stronger adhesive action; and then an appropriate amount of ammonium dihydrogen phosphate flame retardant is added, and the corn straw fire retardant flakeboard is manufactured by a hot pressing technology. The method has a simple process, not only can save wood, but also can improve utilization rate and practical value of agricultural wastes. The surfaces of the corn straw particles are activated by using the enzyme / mediator system, so that enzyme activation time is reduced effectively, and production efficiency is improved. In the process, an adhesive is not added, the free formaldehyde is not released when hot pressing and using, and the method is a novel and environmental-friendly production technology for the flakeboards with functions of flame resistance and the like.

Description

technical field [0001] The invention relates to a method for activating corn stalks by a laccase / mediator system to manufacture a flame-retardant particle board, which belongs to the manufacturing method of artificial boards. Background technique [0002] At present, in the wood industry, adhesives are basically used in wood-based panel products. The "trialdehyde" glue made of petroleum will cause the release of free formaldehyde and pollute the indoor environment. In order to get rid of the dependence on "trialdehyde" glue, green enzymes are used to catalyze Technology to prepare glue-free wood-based panels came into being. At the same time, due to the flammability of wood-based panels, its application in the fields of furniture and interior decoration is limited, so flame-retardant treatment is imperative for wood-based panels. my country is a large agricultural country with abundant crop straw resources. The annual harvested air-dried straw resources have reached 700 mil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/02B27N1/00B27N3/10
Inventor 袁媛郭明辉
Owner NORTHEAST FORESTRY UNIVERSITY
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