The Method of Improving the Performance of Carbonized Wood by Silica Sol Impregnation Pretreatment

Abstract

The invention relates to a method for improving a carbonized wood property by silica sol impregnation pretreatment. The method comprises the following steps of: placing wood in a treatment tank, carrying out the silica sol infusion pretreatment on the wood, and carrying out stacking and air dry on the treated wood; carrying out common kiln drying on the treated wood so as to enable the water content ratio of the wood to be reduced to be 12-18%, and then discharging the dried wood out of a kiln, placing the wood after drying in charring equipment for carrying out hot modification carbonizing treatment; and finally taking out the wood. The method provided by the invention has the advantages that silica sol is adopted to be used as modification liquid so as to carry out the impregnation pretreatment on the wood, the front drying is not needed, the manufacturing cost is low, the mass loss rate of preparative carbonized wood is reduced, and the equilibrium water content is reduced; and the dimensional stability. the density and the mechanical strength are improved, corrosion proof and weather resisting properties are improved, flame retardant and termite proof properties can be improved to a certain degree, and the method has the characteristics of being odorless, innoxious, safe and environment-friendly.

Description

technical field [0001] The invention belongs to the field of wood processing, and relates to a method for thermally modifying and carbonizing wood, in particular to a method for improving the properties of carbonized wood through silica sol impregnation pretreatment. Background technique [0002] Carbonized wood is a wood product with excellent performance, beautiful color and environmental friendliness (Gu Lianbai et al., 2008). It can be widely used in decoration, flooring, furniture and garden landscape, and is favored by consumers. At present, domestic wood carbonization methods mainly use superheated steam or nitrogen as heat transfer medium and protective gas to avoid excessive oxidation degradation or combustion of wood during carbonization, such as CN1868704A, CN101069972A, CN101224593A, CN101007412A. [0003] At present, the carbonized wood processed by the existing known technology still has the following disadvantages: 1) After high-temperature carbonization, the ...

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Problems solved by technology

[0003] At present, the carbonized wood processed by the existing known technology still has the following disadvantages: 1) After high-temperature carbonization, the wood becomes brittle, its density and mechanical strength decrease, and it may break during production or use; 2) It is treated at a temperature lower than 200 °C The dimensional stability, corrosion resistance and weather resistance of the obtained carbonized wood have not been significantly improved; 3) The flame retardancy of the carbonized wood has not been improved; 4) The carbonized wood is more susceptible to termites than uncarbonized wood

However, the flame retardant performance of carbonized wood produced by resin impregnation pretreatment has not been improved; moreover, some resins (such as urea-formaldehyde resin) have poor thermal stability, and thermal decomposition will occur during wood carbonization; at the same time, the resin During the impregnation process, free formaldehyde is released, which is harmful to human health and causes environmental pollution; in addition, the resin pretreatment technology needs to reduce the moisture content of the wood (less than 15%), so the wood needs to be dried before the resin pretreatment , the production cost increases