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Preparation method of two-dimensional woven environment-friendly and high-strength wood-based composite material

A composite material, green and environmentally friendly technology, applied in impregnated wood, wood impregnation, wood processing equipment, etc., can solve the problems of large differences in vertical and horizontal mechanical properties, and achieve the effects of improved mechanical properties, high mechanical properties of materials, and simple preparation methods

Active Publication Date: 2020-12-15
RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process uses compressed and dense wooden mats as reinforcements, and the prepared composite materials have very high mechanical properties, and the longitudinal and transverse mechanical strengths of the materials are similar, which overcomes the shortcomings of traditional wood-based composite materials with large differences in longitudinal and transverse mechanical properties.

Method used

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  • Preparation method of two-dimensional woven environment-friendly and high-strength wood-based composite material
  • Preparation method of two-dimensional woven environment-friendly and high-strength wood-based composite material
  • Preparation method of two-dimensional woven environment-friendly and high-strength wood-based composite material

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preparation example Construction

[0038] The present invention is based on a preparation method of a two-dimensional braided high-strength wood-based composite material, comprising the following steps:

[0039] (1) Basic unit veneer preparation: the solid wood is made into a veneer by the rotary cutting process, the veneer is partially de-lignified, and then the de-lignified veneer is aligned in the same direction to form a blank, and put into the mold. High-temperature hot pressing makes the slab dense; the cooling press takes out the slab, separates each layer of veneer, and then cuts it into long strips of wood suitable for weaving, that is, the basic veneer.

[0040] The partial lignin removal is to remove 0-50% of the original lignin content; the veneers are aligned in the same direction to form a blank, and the veneers are required to contain water, and the moisture content is 0-50%; High temperature hot pressing, the temperature range is 80-200 ° C; the denseness mentioned means that after compression, ...

Embodiment 1

[0051] Poplar was selected as raw material, and the poplar veneer with a thickness of 200 μm was prepared by rotary cutting, as shown in figure 1 As shown, 50 veneers are immersed in a container containing a mixed solution of sodium hydroxide and sodium sulfite (wherein the concentration of sodium hydroxide is 0.1mol / L, and the concentration of sodium sulfite is 1mol / L), the volume of the solution is 500mL, water Cook for 30 minutes, then take out the wood veneer and wash it with distilled water for 3 times. Add 500 mL of water to the container again, add it to the aqueous solution of hydrogen peroxide (the mass fraction of hydrogen peroxide accounts for 10% of the total solution), boil in water for 1 hour, take it out, wash it with distilled water 3 times, and dry it. Align the wood veneers along the same direction, assemble the blanks, place them in the mold of the cold press, apply high pressure, raise the temperature to 120°C, cool to room temperature after 3 hours, remove...

Embodiment 2

[0053] Poplar was selected as a raw material, and poplar veneers with a thickness of 200 μm were prepared by rotary cutting, and 50 veneers were immersed in a container containing a mixed solution of sodium hydroxide and sodium sulfite (wherein the concentration of sodium hydroxide was 0.2 mol / L, the concentration of sodium sulfite is 0.8mol / L), the solution volume is 500mL, boiled in water for 30min, then the wood veneer is taken out, and washed with distilled water for 3 times. Add 500 mL of water to the container again, add it to the aqueous solution of hydrogen peroxide (the mass fraction of hydrogen peroxide accounts for 10% of the total solution), boil in water for 1 hour, take it out, wash it with distilled water 3 times, and dry it. Align the wood veneers along the same direction, assemble the blanks, place them in the mold of the cold press, apply high pressure, raise the temperature to 120°C, cool to room temperature after 3 hours, remove the mold, take out the slabs...

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Abstract

The invention relates to a preparation method of a two-dimensional woven environment-friendly and high-strength wood-based composite material, and belongs to the field of composite material manufacturing and the field of wood processing. Solid wood is manufactured into veneers by adopting a rotary cutting process, lignin is partially removed from the veneers, then the lignin-removed veneers are aligned and arranged in the same direction for assembly, the veneers are put into a mold, and high-temperature hot pressing is conducted to prompt a plate blank to be compact; the plate blank is taken out through a cooling pressing machine, and all the layers of veneers are separated and then cut into long-strip-shaped wood sheets, namely element veneers, suitable for weaving; two-dimensional weaving is conducted on the element veneers according to a crisscross principle; an adhesive is applied to the surfaces of the veneers formed through weaving, the veneers are aligned and arranged in a stacked mode, then the arranged assembled veneers are placed in a cold press grinding tool, and high pressure is applied; and the mold of a cold press is heated to promote high-temperature curing of the adhesive, and after curing is completed, cooling and demolding are conducted to obtain the composite material. The composite material is small in water absorption thickness expansion rate, good in sizestability, easy to process and beneficial to promoting green development of the composite material.

Description

technical field [0001] The invention relates to a preparation method of a two-dimensional braided green, environment-friendly and high-strength wood-based composite material, which belongs to the field of composite material manufacturing and wood processing. The present invention adopts a top-down method (preparing high-strength composite materials directly from wood), which is easy to implement, and the wood-based composite materials produced have very high mechanical strength, low density, and light weight per unit volume. The field has very good application prospects. Background technique [0002] With the development of society, although wood-plastic composite materials have both the texture of plastic and wood, they have been widely used in many fields, but their preparation methods determine that the mechanical properties of the material are insufficient, so they can only be used as interior decoration materials. , and it is relatively seldom used outdoors or as indus...

Claims

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Application Information

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IPC IPC(8): B27D1/08B27J1/02B27G11/00B27K3/08B27K3/32B27K3/52
CPCB27D1/08B27J1/02B27G11/00B27K3/08B27K3/32B27K3/52
Inventor 唐启恒郭文静高黎
Owner RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY
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