Method for manufacturing particleboards by using wheat straws preprocessed through steam explosion

A particleboard and pretreatment technology is applied in the field of using steam explosion method to pretreat wheat straw to manufacture particleboard.

Inactive Publication Date: 2012-06-13
TIANJIN UNIV OF COMMERCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to overcome the problems of low strength and high glue consumption in the production of particle boards using wheat straw raw materials, and provides a method for pretreating wheat straw by steam explosion, peeling off the water-repellent cuticle covering the surface of wheat straw, and eliminating its adsorption and penetration of adhesives. The hindering effect of wheat straw to improve the wettability and bonding performance of wheat straw, improve the strength of wheat straw particleboard, reduce the production cost of wheat straw particleboard, and realize the method of manufacturing particleboard of industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Use a grass cutter to cut the raw material of wheat straw into 30 mm long grass sections, use an 8-mesh sieve to remove short debris and impurities, and manually select to remove most of the leaves and ears to obtain qualified raw materials.

[0019] (2) Add the crushed and screened qualified wheat straw raw materials into water at a solid-to-liquid ratio of 1:10, mix them evenly and place them in a steam explosion tank, close the steam explosion tank, and rapidly heat up to 180°C within 10 minutes, and the pressure When it reaches 1003.5KPa~1255.6KPa, the pressure will be released instantly after 5 minutes of heat preservation, so that the raw materials will enter the storage barrel under the action of pressure difference. After the raw materials in the storage tank are cooled, they are filtered to separate the steam-exploded wheat straw solids and liquid water-soluble parts.

[0020] (3) Dry the steam-exploded wheat straw solids at 105°C until the moisture content...

Embodiment 2

[0022] All the operation steps of Example 1 were repeated, except that the temperature of the steam explosion pretreatment adopted was 190° C., and the pressure reached 1003.5KPa˜1255.6KPa. The static bending strength of the obtained wheat straw particleboard was 12.0 MPa, the modulus of elasticity was 1860 MPa, and the internal bonding strength was 0.45 MPa.

Embodiment 3

[0024] Repeat all the operation steps of Example 1, the difference is that when the steam explosion pretreatment is adopted, the pressure is released instantaneously after the heat preservation for 3 minutes. The static bending strength of the obtained wheat straw particleboard was 14.1 MPa, the modulus of elasticity was 2155 MPa, and the internal bonding strength was 0.46 MPa.

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Abstract

The invention discloses a method for manufacturing particleboards by using wheat straws preprocessed through steam explosion, and aims to provide a method for manufacturing the particleboards by preprocessing the wheat straws through steam explosion to peel off hydrophobic cuticles on the surfaces of the wheat straws so as to improve the wettability and adhesion property, improve the strength of the wheat straw particleboards and reduce the wheat straw particleboards, and suitable for industrial production. The method comprises the following steps of: adding water into a wheat straw raw material in a liquid-solid ratio of 10:1, uniformly mixing, putting into a steam explosion tank, quickly heating to the temperature of between 180 and 190DEG C, keeping the temperature for 3 to 5 minutes, and instantly releasing pressure; cooling the raw material in a storage bucket, filtering, and separating a steam-exploded wheat straw solid matter from a liquid water soluble part; drying the steam-exploded wheat straw solid matter until the water content is 3 percent, and stirring uniformly with an adhesive which is 8 to 10 percent of the absolute dry weight of the wheat straw solid matter, wherein the adhesive is urea resin; and paving the steam-exploded wheat straw solid matter stirred with the adhesive to obtain slabs, and performing hot-forming.

Description

technical field [0001] The invention relates to a method for pretreating wheat straw to make particle boards by means of a steam explosion method. Background technique [0002] my country is a Shaolin country with a shortage of forest resources. The contradiction between the supply and demand of wood is prominent. The limited supply of wood cannot meet the demand for wood in the rapid development of the national economy. The shortage of wood supply must be supplemented by the development of wood-based panels. [0003] my country is a large agricultural country, and the output of agricultural waste wheat straw is huge. However, this renewable natural resource has not been fully utilized so far. At present, it is mainly disposed of by burning in the field, which not only causes serious air pollution, but also wastes valuable fiber resources. [0004] Compared with wood, wheat straw has the following characteristics: ① High ash content, the ash content of wood is less than 1%,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/36B27N3/02B27N1/02B27N3/10
Inventor 罗鹏
Owner TIANJIN UNIV OF COMMERCE
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