Method for preparing glue-free self-bonding environment-friendly artificial board through microwave pretreatment of wood flour

Abstract

The invention discloses a method for preparing a glue-free self-bonding environment-friendly artificial board through microwave pretreatment of wood flour. The method comprises the following steps of: tightly winding a plurality of wire materials to construct an artificial board framework, putting wood-plastic particles in one side of the front breadth of the artificial board, and carrying out microwave heating at 18GHz-24GHz; after cooling, the wood-plastic particles are pressed in large amplitude, so that the wood-plastic particles are regularly arranged in a line material pore channel according to the stress orientation, and after continuous pressing is conducted for 15-30 min, the adjacent wood-plastic particles arranged according to the stress orientation are bonded; wood powder is poured into the back face of the board, the wood powder is filled around the wood-plastic particles arranged according to the stress orientation, and secondary microwave heating with the frequency being 35 GHz or above is conducted on the artificial board; and after cooling, small-amplitude pressing is carried out according to the arrangement direction of the wood-plastic particles. According to the method, the wood-plastic materials and the wood powder particles are subjected to graded microwave treatment, and the inclined orientation degree is achieved in the artificial board through a targeted pressing scheme, so that the mechanical property of the artificial board is improved, and the tensile strength and the fatigue resistance of the artificial board are greatly improved in the orientation direction.

Description

technical field [0001] The invention relates to the field of environmental protection or the field of plate preparation, in particular to a method for preparing glue-free self-bonding environmental-friendly wood-based panels from wood powder pretreated by microwaves. Background technique [0002] In traditional wood processing methods, synthetic resins, such as phenolic resins, are mostly used as adhesives to manufacture boards. On the one hand, the cost of the adhesive itself accounts for a large part of the cost of board preparation. On the other hand, the adhesive will also cause continuous damage to the environment and human body. adverse effects of sex. [0003] At present, the preparation of glue-free boards adopts the high-pressure steam cooking method, usually using cellulose or lignin as the skeleton and filler. However, cellulose and lignin themselves are used as the skeleton, and during the hot-pressing process, the overall structure will be affected. At the same...

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Problems solved by technology

[0002]In traditional wood processing methods, most of the synthetic resins, such as phenolic resin, are used as adhesives to manufacture boards. On the one hand, the cost of the adhesive itself occupies a large part of the board preparation cost On the other hand, the adhesive will also cause persistent adverse effects on the environment and the human body

[0003]The current preparation of non-glue boards adopts high-pressure steam cooking method, usually using cellulose or lignin as the skeleton and filler, but the cellulose and lignin themselves As a skeleton, its overall structure will be damaged during the hot pressing process, and the raw material itself will be denatured, thus losing the tensile properties and static bending strength provided by the skeleton before hot pressing, making it difficult for technicians in the pre-production process to artificially The performance budget of the finished board, there is no glue-free wood-based panel preparation method that can form a controllable tensile structure during the hot pressing process and can still retain various properties after the hot pressing is completed

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