Method for modification of plantation wood by inorganic impregnation

Abstract

The invention discloses a method for modification of plantation wood by inorganic impregnation. The method performs respiratory circulating treatment on plantation wood by means of vacuum pumping to form negative pressure, impregnation in a solution A, application of positive pressure, discharge of redundant solution A, vacuum pumping to form negative pressure, impregnation in a solution B, application of positive pressure, and discharge of redundant solution B, thus obtaining inorganic impregnation modified plantation wood. Specifically, the solution A is a sodium silicate solution, and the solution B is a mixed solution of one or several of silica, magnesium oxide, aluminum oxide, zinc oxide and aluminum silicate and a polyvinyl alcohol solution. The method provided by the invention simulates the biological respiration principle, adopts the negative pressure expiration-positive pressure inspiration alternating circulation to treat wood, and has the advantages of high permeability, uniform impregnation, flame retarding and smoke suppression, excellent performance and green and environmental protection.

Description

Technical field [0001] The invention belongs to the technical field of wood functional improvement, and relates to a method for inorganic impregnation and modification of plantation wood, in particular to a method for inorganic impregnation and modification of plantation wood by breathing silicate. Background technique [0002] As an environmentally friendly renewable material, wood is widely used in construction, decoration and furniture due to its unique qualities. However, with the reduction of natural forest resources and the implementation of the country's commercial logging policy prohibiting natural forests, the contradiction between supply and demand in the timber market has become increasingly intensified, and fir timber has become the main channel to meet the timber market demand. However, Chinese fir wood has defects such as loose material, low density, and poor dimensional stability. Reinforcing and modifying it can greatly improve the performance and added value of C...

AI Technical Summary

Problems solved by technology

However, fir wood has defects such as loose material, low density, and poor dimensional stability. Reinforcing and modifying it can greatly improve the performance and added value of fir wood, and expand the application field.

In the early days, scholars at home and abroad researched more on the impregnation modification of organic matter. The commonly used resins mainly include phenolic resin, urea-formaldehyde resin, polymethyl methacrylate and other resins, which can improve the related properties of wood, but at the same time, there are also some problems. : In the process of resin impregnation and drying treatment to the product, toxic gases such as formaldehyde and phenol will be released; the effective use time of organic modifiers is short and cannot be reused, which increases the cost of modification on the side; organic substance modification wood is more flammable than

In previous studies, mechanical treatment, solvent replacement, steam explosion and freeze-drying were mainly used to improve the permeability of wood, but the effect on plantations with low permeability such as Chinese fir was insignificant.

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