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Maize stalk and/or wheat stalk composite board and its manufacturing method

A technology of corn stalks and wheat stalks, which is applied in the direction of manufacturing tools, flat products, and other household appliances. The effect of binding strength

Inactive Publication Date: 2011-01-26
SHIJIAZHUANG RAILWAY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the structure and composition of crop straws are different from those of wood. The inventor once used urea-formaldehyde resin adhesives to make corn straw and / or wheat straw composite boards for experiments. As a result, the performance indicators of the boards were not ideal and could not meet GB / T4897-1992 "Particleboard 》Performance indicators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1: Use a hay cutter to cut corn stalks into fragments of 25 mm, and remove impurities such as soil and broken leaves through the first sieve; the straw fragments are dried in a dryer at a temperature of 100° C. 7.8%; crushed with a pulverizer, crossed the second sieve to remove superfine leaves and stalk powder; crossed the third sieve to separate the coarse straw material and then crushed; choose the treated corn stalk raw material with a mass percentage of 96%, and then Spray the isocyanate adhesive prepared by polymethylene polyphenylene isocyanate and isocyanate water-soluble agent at a ratio of 1:1.5 with a mass percentage of 4% to the surface of the straw raw material, and form an adhesive film on the surface of the straw raw material, with a thickness of 8mm corn stalk plate. The hot-pressing process is as follows: the hot-pressing temperature is 170° C., the hot-pressing time is 180 s, and the hot-pressing pressure is 3.0 MPa. The properties of the plat...

Embodiment 2

[0016] Embodiment 2: use the hay cutter to cut the wheat straw into 20mm fragments, remove soil and broken leaf impurities; crush with a pulverizer, and remove the powder through the second sieve; dry at a temperature of 110°C in a drier, Make the water content at 7%; select the treated wheat straw raw material with a mass percentage of 97%, and then prepare a 3% mass percentage of polymethylene polyphenylisocyanate and isocyanate water-soluble agent according to the ratio of 1: 2.0. The isocyanate adhesive is sprayed on the surface of the straw raw material to form an adhesive film on the surface of the straw raw material to make a 12mm thick wheat straw board. The hot-pressing process is as follows: the hot-pressing temperature is 175° C., the hot-pressing time is 300 s, and the hot-pressing pressure is 3.0 MPa. The properties of the plates are shown in Table 2.

[0017] Table 2 Properties of 12 mm thick wheat straw board

[0018] project

[0019] Moistu...

Embodiment 3

[0021] Embodiment 3: get the wheat stalk raw material after the treatment that is 50% by mass fraction, the corn stalk raw material that mass percentage is 44%, then the polymethylene polyphenylene isocyanate and isocyanate water-soluble agent that is 6% by mass percentage The isocyanate adhesive formulated at a ratio of 1:1.2 was sprayed on the surface of the straw raw material, an adhesive film was formed on the surface of the straw raw material, and a composite board with a thickness of 16 mm was produced. The hot-pressing process is as follows: the hot-pressing temperature is 175° C., the hot-pressing time is 300 s, and the hot-pressing pressure is 2.5 MPa. The properties of the plates are shown in Table 3.

[0022] Table 3 Properties of 16 mm thick wheat and corn straw composite panels

[0023] project

[0024] Vertical board screw holding force

[0025] *Note: Standards are GB / T4897.1-2003, GB / T4897.3-2003 and GB18580-2001

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PUM

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Abstract

The invention relates to the compound board making using corn and wheat straw, comprising the material processing, mixed gluing, spreading, preheating, hot pressing and after treatment. It can recycle the corn and wheat straws, using polymethlene polyphenyl isocyanate and isocyanate solution in 1:1-1:2. 5 proportion to form the isocyanate adhesive, quick in high temperature solidification, strongin adhesion, low in formaldehyde emission, perfect for indoor decoration. It is highly biological.

Description

technical field [0001] The invention relates to a composite wood-based panel using corn and / or wheat straw as raw materials and a manufacturing method thereof. Background technique [0002] Wood-based panels including particleboard and fiberboard are all made of wood. Although wood scraps can be used to improve the utilization rate of wood, the production is ultimately maintained by consuming wood. With the shortage of forest resources worldwide, the production of wood-based panels is bound to be limited. However, the demand for wood-based panels in interior decoration and furniture manufacturing is increasing year by year. Wheat and corn are the main crop varieties in northern my country, and a large amount of straw is produced every year. In the past, these straws were the main fuel in the countryside. With the development of the rural economy, the energy structure in the countryside has undergone major changes. Farmers no longer use crop straws as the main fuel, but bur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27N3/02B27N1/00B27N1/02B27N3/08B27N3/10B27N3/18B27N7/00
Inventor 丁占来任德亮齐海波籍凤秋
Owner SHIJIAZHUANG RAILWAY INST
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