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Method for producing plasticizing bamboo or wood single-sided laminated sheet material and application

A manufacturing method and technology of wood veneer, applied in the direction of wood compression, impregnated wood, manufacturing tools, etc., can solve problems such as cracking, impregnated paper surface layer is easy to wear through, and achieve the effect of high wear resistance

Inactive Publication Date: 2009-03-04
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all have certain defects to varying degrees, such as: the problem of moisture absorption and rebound of the compressed and compacted veneer, the problem of resin-impregnated veneer drying and cracking during transportation, and the problem that the impregnated paper surface layer is easy to wear through, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take a poplar veneer with a thickness of 2mm (dry veneer or wet veneer can be used), dip it in a 15% NaOH solution, moisten it for 6 hours at 0-5°C, take out the veneer, drain and impregnate liquid. Then put the lye to moisten the veneer into the reactor, and add benzyl chloride solution (2.0g / g veneer) at the same time, so that the veneer is completely immersed in benzyl chloride, and react at 115°C for 2 hours. Take out the veneer, wash it four times alternately with water and industrial ethanol, and then dry it at 103°C for about 4 hours. Then put one piece of poplar veneer after benzylation treatment and drying into a hot press, and press it for 5 minutes at a temperature of 135-140° C. and a pressure of 1.0 MPa. Pressure relief is taken out to make plasticized poplar veneer veneer material. The thickness of the veneer material is 1mm (after hot pressing and plasticizing, the original 2mm thick veneer is compressed to a thickness of only 1mm), the size does not ch...

Embodiment 2

[0014] Take a bamboo mat with a thickness of 1.5mm (the thickness of the bamboo is 0.75mm, and there is no special requirement for the moisture content), dip it in a 20% NaOH solution, moisten it for 5 hours at 40-45°C, take out the bamboo mat, drain and impregnate liquid. Then put the lye to moisten the bamboo mat into the reactor, and add benzyl chloride solution (1.5g / g bamboo material) at the same time, so that the bamboo mat is completely soaked in the benzyl chloride, and react at 115°C for 3 hours. Take out the bamboo mat, wash it four times alternately with water and industrial ethanol, and then dry it at 103°C until the moisture content is below 16%. Then two sheets of bamboo mats after benzylation treatment and drying were stacked and put into a hot press, and hot pressed at a temperature of 135-140° C. and a pressure of 2.0 MPa for 10 minutes. Pressure relief is taken out to make plasticized bamboo mat veneer material. The surface of the material is smooth, elimin...

Embodiment 3

[0016] Use 19 layers of eucalyptus veneer or other hard miscellaneous wood veneer with a thickness of 1.7mm to make a container floor substrate with a thickness of 27mm through glue coating, billet formation, and hot pressing. The thickness is sanded to 26mm, and polyurethane adhesive or Acrylic adhesive or other water-resistant adhesives cured at room temperature, two plasticized poplar veneers made in Example 1 were respectively placed on the upper and lower surfaces of the substrate after coating, and placed in a cold press, at a unit pressure of 1.5 Pressurize under MPa for 20 minutes, take it out and stack it for more than 24 hours to make a plasticized veneer veneer container bottom plate. The performance indicators of the container floor meet the national standard GB / T19536-2004 "plywood for container floor".

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PUM

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Abstract

The invention relates to a method for manufacturing plasticized surfacing linings of bamboo and wood veneers and the application thereof. The method comprises the following steps: (1) moistening with alkali at the low temperature; (2) treating with phenmethyl; and (3) hot-pressing and shaping treatment: plasticized surfacing linings of bamboo and wood veneers are applied to the surface linings of structural veneers of various artificial slabs, such as container bottom plates, carriage bottom plates, cement templates and the like, so as to improve the surface wear resistance and static bending strength, and reduce the cost of surface materials. The invention has the advantages that the crystal structure of wooden fabric is locally or completely damaged through the moistening of the alkali at the low temperature, so as to fully expose the hydroxide radical of the crystallization region, enable a phenmethyl agent to be bonded with the hydroxide radical to the maximum extent, and introduce new radical, thereby changing the original microstructure and chemical properties of the wooden fabric; and in the hot-pressing and shaping period, the novel material which can preserve the advantages of wooden material is formed and is provided with the certain characteristics of plastics, such as hot melt processability, stable dimension with moist heat, high wear resistance, and the like.

Description

technical field [0001] The invention relates to a manufacturing method and application of plasticized bamboo and wood veneer veneer materials with high strength and high wear resistance prepared by using wood veneer or bamboo mat through plasticization and shaping. The invention belongs to the fields of wood science, wood processing and utilization and wood-based panel technology. Background technique [0002] Natural high-quality forest resources have been over-exploited, and the significance of remaining resources to protect soil erosion and maintain ecological balance is far more important than utilization. Deep development. Fast-growing wood generally has a low density, and its mechanical properties such as static bending strength, elastic modulus, and surface hardness are relatively low. Strengthening, surface hardening and dimensional stabilization of fast-growing wood are the focus of research and development. The methods used so far mainly include the following thr...

Claims

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Application Information

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IPC IPC(8): B27M1/08B27K3/20B27K3/38B27M1/02
Inventor 孙丰文张彰
Owner NANJING FORESTRY UNIV
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