Hydrophobic and ultraviolet radiation aging-resistant wood-based composite material and preparation method thereof

Abstract

The invention discloses a hydrophobic ultraviolet radiation aging-resistant wood-based composite material and a preparation method thereof. The surface layer of the composite material is of a titanium dioxide layer with a micro-nano secondary structure and the crystal structure of the composite material is of a rutile type. The preparation method comprises the processes of precursor solution preparation, multistage dipping and drying: firstly dispersing a water-soluble titanium source in a 5-7mol/L sodium chloride aqueous solution to obtain a solution a, wherein the concentration of the water-soluble titanium source is guaranteed to be 0.001-0.500 mol/L; uniformly adding an alkaline matter into the solution a to obtain a precursor solution, wherein the concentration of the alkaline matter is guaranteed to be 0.001-0.500 mol/L; dipping a wooden base material into the precursor solution, reacting at a room temperature for 1-10 days, cleaning and drying for 1-2 days to obtain a wood-based composite material; dipping the wood-based composite material in 0.8-1.2% of a low-surface energy matter solution, reacting at a room temperature for 0.2-1 day and drying for 1-2 days to obtain the hydrophobic ultraviolet radiation aging-resistant wood-based composite material. According to the preparation method, a titanium dioxide surface layer with a rutile type micro-nano secondary structure can be constructed on the surface of the wooden base material so that the wood-based composite material is excellent in hydrophobicity and ultraviolet radiation 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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