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
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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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