Formaldehyde-free antibacterial bamboo straw composite base material and preparation method thereof

Abstract

The invention relates to a formaldehyde-free antibacterial bamboo straw composite base material and a preparation method thereof. The preparation method comprises the steps that in-situ preparation ofan antibacterial adhesive is conducted, specifically, lignin is used for conducting in-situ reduction on silver ions to generate nano-silver, and the antibacterial adhesive is obtained; preparation of the composite base material is conducted, specifically, the base material is prepared from crushed bamboo and / or crushed straw with the length of 0.3-20.0 mm and the thickness of 0.3-0.7 mm, and a surface layer and core layer mixture is obtained after mixing; and preparation of the formaldehyde-free antibacterial bamboo straw composite base material is conducted, specifically, an upper surface layer mixture, a lower surface layer mixture and the core layer mixture are respectively mixed with the antibacterial adhesive and / or an isocyanate adhesive for gluing to obtain a glued mixture, and paving, hot-pressing and post-treating are conducted on the glued mixture to obtain the formaldehyde-free antibacterial bamboo straw composite base material. According to the method, existing bamboo andstraw resources are fully utilized, the formaldehyde emission of the prepared composite base material is extremely low, the requirements of standards of formaldehyde-free artificial boards and products thereof are met, and meanwhile the composite base material has excellent antibacterial performance.

Description

technical field [0001] The invention relates to a composite base material, in particular to an formaldehyde-free antibacterial bamboo straw composite base material produced by using bamboo scraps and straw scraps and a preparation method thereof, belonging to the field of composite material preparation. Background technique [0002] my country's annual timber consumption has reached more than 600 million cubic meters, and the dependence on foreign timber exceeds 50%, with a gap of 250 million cubic meters. my country is the world's largest producer and consumer of wood-based panels, with an annual output of nearly 300 million cubic meters. Under the tremendous pressure of objectively existing and growing demand for timber products, the state's attitude towards "protecting forest resources" has become increasingly clear, and measures to limit and ban forest logging have also been intensified. The source of raw materials for the panel production industry Faced with great chal...

AI Technical Summary

Problems solved by technology

After coating the antibacterial layer, the surface of the particleboard is prone to roughness and dents, which not only increases the difficulty of the preparation process, but also makes it difficult to carry out finishing treatment on the particleboard base material coated with the antibacterial layer, which limits the application of particleboard

[0005] At present, the commonly used floor substrates on the market use plywood, fiberboard or oriented strand board as raw materials, and the preparation process is complicated and the cost is high.

And the surface of the floor substrate prepared by oriented strand board is uneven

Ordinary particleboard has low density and low strength, so it is difficult to be used as a floor substrate

Images