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A full-surface super-hydrophobic antifreeze high-strength wood and its manufacturing method

A manufacturing method and full-surface technology, applied in the field of wood manufacturing, can solve problems such as insufficient penetration depth, low penetration, and unsatisfactory hydrophobic effect on the inner surface of wood, so as to solve pore blockage, enhance connectivity, excellent frost resistance and high intensity effect

Active Publication Date: 2021-04-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the disconnected pore structure of natural wood, the penetration depth of conventional infiltration methods is not enough, the penetration amount is small, and the hydrophobic effect of the inner surface of wood is not ideal.
Therefore, full-surface hydrophobic wood as a structural material has not been reported

Method used

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  • A full-surface super-hydrophobic antifreeze high-strength wood and its manufacturing method
  • A full-surface super-hydrophobic antifreeze high-strength wood and its manufacturing method
  • A full-surface super-hydrophobic antifreeze high-strength wood and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] Example 1: Red Walnut

[0083] According to the method of the present invention, 1.5wt% hydrophobic nanoparticle solution and red walnut are placed in a vacuum drying box to evacuate, the vacuum degree is 1.5bar, and the pressure is kept for 30 minutes; after the adsorption is completed, use an extruder to apply 800KPa on the wood surface pressure and repeat the squeeze-release process 15 times. After completion, under the condition of 100°C, apply a pressure of 5 MPa on the surface of the wood to reduce the thickness of the wood to the minimum, and then keep the hot pressing state for 30 minutes. The test results after treatment are shown in Table 1.

Embodiment 2

[0084] Example 2: Beech

[0085] According to the method of the present invention, 2wt% hydrophobic nanoparticle solution and beech wood are placed in a vacuum drying oven to evacuate, and the vacuum degree is 2bar, and the pressure is kept for 30 minutes; Repeat the squeeze-release process 15 times. Put the 2wt% perfluorosilane solution and the wood in a vacuum drying oven, evacuate at a vacuum degree of 2 bar, and hold the pressure for 30 minutes. After completion, under the condition of 100°C, apply a pressure of 5 MPa on the surface of the wood to reduce the thickness of the wood to the minimum, and then keep the hot pressing state for 30 minutes. The test results after treatment are shown in Table 1.

Embodiment 3

[0086] Embodiment 3: heart peach

[0087] According to the method of the present invention, 2wt% hydrophobic nanoparticle solution and beech wood are placed in the vacuum drying box to evacuate, and the vacuum degree is 2bar, hold pressure for 30 minutes; Repeat the squeeze-release process 15 times. Put the 2wt% perfluorosilane solution and the wood in a vacuum drying oven, evacuate at a vacuum degree of 2 bar, and hold the pressure for 30 minutes. Repeat the step after the first adsorption is completed 3 times. After completion, under the condition of 100°C, apply a pressure of 5 MPa on the surface of the wood to reduce the thickness of the wood to the minimum, and then keep the hot pressing state for 30 minutes. The test results after treatment are shown in Table 1.

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Abstract

The invention relates to full-surface super-hydrophobic anti-freezing wood and a manufacturing method thereof. The preparation method comprises the following steps: partially removing lignin and hemicellulose to form spongy wood, injecting hydrophobic nanoparticles and perfluorosilane into the outer surface and internal pores of the spongy wood through an absorption-extrusion process, and finally,carrying out hot-pressing densification treatment to obtain the super-hydrophobic anti-freezing high-strength wood. The super-hydrophobic anti-freezing high-strength wood disclosed by the invention is densified full-surface hydrophobic wood; the densification means that the wooden pipeline and the porous wooden cell wall partially collapse, so that the thickness of the wood is reduced to 30-40% of the initial thickness, and the density is increased by 2.5-3 times; wherein the full-surface hydrophobicity refers to the synergistic hydrophobicity of the outer surface of the wood and the inner surface of the pore passage of the wood. According to the anti-freezing high-strength wood, the bending strength is improved by 2-4 times compared with logs made of the same material; after 10 times offreezing and thawing cycles and 50 times of freezing and thawing cycles respectively, the bending strength is kept at 80% or above and 50% or above respectively; and the dimensional stability is stillmaintained even after 50 times of freezing and thawing cycles.

Description

technical field [0001] The invention belongs to the technical field of wood production, and relates to a full-surface super-hydrophobic and frost-resistant high-strength wood and a production method thereof. Background technique [0002] For centuries, wood has been widely used in daily life such as construction and decoration due to its rich natural resources, renewability, easy processing and good thermal insulation properties. Wood is a composite material mainly composed of cellulose, hemicellulose, and lignin, and has a rich porous structure with tubular channels along the growth direction. The porous nature of wood determines its low structural strength, and the general tensile strength is below 100MPa; the composition of wood determines its strong hygroscopicity, and it is also two key issues restricting its application. In addition, due to the presence of a large number of hydrophilic groups, it can lead to many harmful effects, including mildew, dimensional instabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K3/08B27K5/00B27K5/04B27K3/02B27K3/00B27K3/32B27K3/50B27K3/34B27K3/22B27K3/26
CPCB27K3/007B27K3/0214B27K3/08B27K3/22B27K3/26B27K3/32B27K3/34B27K3/50B27K5/001B27K5/04B27K2240/70
Inventor 杨丽丽刘梦葛邓腾赵一平解晓雨俞婷
Owner DONGHUA UNIV
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