Method for preparation of superhydrophobic timber on the basis of sol-gel method

A super-hydrophobic, sol-gel technology, applied in wood treatment, wood impregnation, wood impregnation, etc., can solve the problems of difficult to achieve super-hydrophobic surface preparation, poor acid and alkali resistance, loss of super-hydrophobic properties, etc., and achieve good industrial application. Prospect, good hydrophobicity, good resistance to acid and alkali erosion

Inactive Publication Date: 2016-05-25
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the prepared superhydrophobic wood surface has poor resistance to acid and alkali erosion; in addition, dust and oily substances in the external environment are easy to contaminate the superhydrophobic surface, making it gradually lose superhydrophobic properties, and it is difficult to realize the preparation of large-area wood superhydrophobic surfaces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add 3ml of ammonia water (25%) into 50ml of absolute ethanol, stir magnetically at 50°C for 30min, then add 3ml of tetraethyl orthosilicate (TEOS) dropwise to the above solution, and continue stirring for 2h to form a light blue Transparent silica sol. Add 0.5% of triethoxy-1H,1H,2H,2H-heptadecafluorodecylsilane to the sol system to hydrophobically modify the sol, and continue the reaction at 50°C for 2 hours to obtain a hydrophobic silica sol.

[0050] A wooden block with a size of 20 mm × 20 mm × 5 mm (radial × longitudinal × chord) was placed in absolute ethanol, ultrasonically cleaned for 10 min to remove impurities and pollutants on the wood surface, and then dried at 80 °C for 5 h. Put the cleaned wood blocks into the modified silica sol for immersion treatment for 30 minutes, and then put the treated wood in an oven at 103°C to dry for 3 hours, so that the modified silica sol solidifies on the wood surface to form a stable film layer, and obtains Superhydrophobi...

Embodiment 2

[0051] Example 2: According to the operation method and steps of Example 1, change triethoxy-1H,1H,2H,2H-heptadecafluorodecylsilane (FAS) to hexadecyltrimethoxysilane (HDTMS) , the added mass percentage concentration is adjusted to 1%, and a super-hydrophobic surface can also be obtained. The contact angle of water droplets on the wood surface is about 150°, and the rolling angle is about 10°.

Embodiment 3

[0052] Embodiment 3: According to the operation method and steps of Embodiment 1, the dip coating method is changed to spray coating. The spray gun is perpendicular to the wood surface, at a distance of 10-15cm, spray for 5 seconds, wait for the coating to dry naturally for 30 seconds, and then spray the next layer, and spray for a total of 3 times, then put the film-coated wood in an oven at 103°C to dry for 3 hours, and obtain the same Superhydrophobic wood. The contact angle of water droplets on the wood surface is about 152°, and the rolling angle is about 6°.

[0053] In a word, the present invention can make the wood treated by the method have a super-hydrophobic surface resistant to acid and alkali erosion, has the advantages of simple operation, easy realization, low cost of preparation and use, energy saving and environmental protection, good ability to resist acid and alkali erosion and high humidity The advantages of stability in the environment and long service li...

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PUM

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Abstract

The present invention pertains to a method for preparation of superhydrophobic timber on the basis of a sol-gel method, and the method is as follows: (1), silica sol synthesis, to be more specific, materials are prepared in the volume ratio of ammonia to anhydrous ethanol to ethyl orthosilicate of 1:15 to 17:1; (2), hydrophobic modification of monodispersed nano silica sol, to be more specific, hexadecyl trimethoxysilane, or triethoxysilane-1H, 1H, 2H, 2H-heptadecafluorodecyl silane is used for hydrophobic modification of the synthesized monodispersed nano silica sol, and the hydrophobic agent promotes mutual aggregation of nanoparticles to promote the formation of aggregates of silica nanoparticles; and (3) timber coating processing, to be more specific, the timber surface is coated with the hydrophobically modified silica sol solution by dipping or spraying process. Contact angles of the processed timber surface and water droplets are greater than 150 degrees, roll angles are less than 10 degrees, and a superhydrophobic film has good resistance to acid and alkali erosion and stability in high-humidity environment. The method is simple in operation, less demanding on equipment, and capable of scale production, and has wide market prospects.

Description

technical field [0001] The invention belongs to a method for preparing superhydrophobic wood based on a sol-gel method. Background technique [0002] Wood is a renewable, recyclable and naturally degradable green material and biological resource. It has the advantages of beautiful texture, natural color, comfortable texture, good plasticity and easy processing. It is widely used in construction, furniture manufacturing and Interior decoration and other fields. However, the cellulose and hemicellulose in the wood components are rich in free hydroxyl groups, and the presence of nano-voids in the cell wall makes the wood have a strong moisture absorption / water capacity, resulting in easy shrinkage and swelling of the wood, poor dimensional stability, and wood deformation. , warping and cracking. At present, the wood anticorrosion treatment mainly relies on coating the wood surface with waterproof and anticorrosion paint, but the adhesion between the paint layer and the wood s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K3/12B27K3/52B05D7/06B05D3/02
CPCB27K3/12B05D3/0254B05D7/06B05D2203/20B27K3/52B27K2240/70
Inventor 王小青常焕君屠坤坤刘君良柴宇博
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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