A kind of hydrophobic, anti-ultraviolet aging wood-based composite material and its preparation method

Abstract

The invention discloses a hydrophobic and anti-ultraviolet aging wood-based composite material and a preparation method thereof. The surface layer of the composite material is a titanium dioxide layer with a micro-nano secondary structure, and its crystal structure is rutile. The preparation method includes precursor solution preparation, multi-stage impregnation and drying processes. First, the water-soluble titanium source is uniformly dispersed in 5-7mol / L sodium chloride aqueous solution to obtain solution a, so that the concentration of the water-soluble titanium source is 0.001 ~0.500 mol / L; uniformly add the alkaline substance into the solution a to obtain a precursor solution, so that the concentration of the alkaline substance is 0.001~0.500mol / L. Immerse the wood-based substrate in the precursor solution, react at room temperature for 1-10 days, wash and dry for 1-2 days, immerse the obtained wood-based composite material in a 0.8-1.2% solution of low surface energy substances, and react at room temperature for 0.2 ~1d, dry for 1~2d. The preparation method can construct a titanium dioxide surface layer with a rutile-type secondary micro-nano structure on the surface of the wood substrate, so that the wood-based composite material has excellent hydrophobicity and ultraviolet aging resistance.

Description

technical field [0001] The invention belongs to the technical field of wood-based composite materials, and in particular relates to a wood-based composite material which is hydrophobic and anti-ultraviolet aging and a preparation method thereof. Background technique [0002] Wood-based materials and their products are the only biological materials among the four most widely used materials (steel, cement, wood and plastic) in daily life and economic construction. They have high strength-to-weight ratio, easy bonding, moderate rigidity and flexibility, and can be recycled Take advantage of other advantages. The cell wall of wood-based materials is mainly composed of three components: cellulose, hemicellulose and lignin, all of which contain hydroxyl functional groups, so wood-based materials are naturally hydrophilic. When it is exposed to the outdoors, natural aging will gradually occur under the synergistic effect of factors such as water, sunlight, and microorganisms. Amo...

AI Technical Summary

Problems solved by technology

At present, in the field of research and development of wood-based composite materials that are hydrophobic and anti-ultraviolet aging, researchers generally use anatase-type titanium dioxide to modify the surface of wood-based substrates to reduce the degree of photodegradation and moisture absorption and water absorption of the material. The construction of titanium dioxide on the surface of wood substrates is rarely reported

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