Modified China fir composite wood

Abstract

The invention provides modified China fir composite wood. The composite material has better dimensional stability. Impact toughness of modified China fir is reduced slightly, while other main mechanical performance indexes such as bending strength, bending elasticity modulus, parallel-to-grain compressive strength, hardness and the like are all increased. Fast growing China fir wood is treated with an aluminium sulfate solution and a water glass solution in sequence in experiments in order to improve properties of the fast growing China fir wood. Aluminium ions immersed into the wood are boundwith silicate ions, aluminium sulfate precipitates are generated in wood microfiber gaps and cells of tracheids (or fiber), so that the wood is filled with a large amount of inorganic matter, and theChina fir inorganic composite wood is obtained. Dimensional stability of the inorganic composite wood is improved substantially, anti-shrinkage coefficient can reach 34.21, and stability coefficientreaches 80% or higher.

Description

technical field [0001] The invention relates to the construction field, in particular to a modified fir composite wood. Background technique [0002] As a renewable natural material, wood has the advantages of high strength-to-weight ratio, easy processing, good electrical and thermal insulation, and environmental characteristics unmatched by other materials. It is widely used in the construction industry and furniture decoration industry. . Due to the disadvantages of low density, poor mechanical strength and dimensional stability of wood, its application range is greatly limited. How to modify wood, expand its use range, and improve the comprehensive utilization of wood has become a hot and difficult point in the wood industry research. In recent years, scholars from various countries have done a lot of research on wood modification of plantation forests. At present, a lot of basic research on wood has been carried out using different processes at home and abroad, mainly...

AI Technical Summary

Problems solved by technology

In recent years, scholars from various countries have done a lot of research on wood modification of plantation forests. At present, a lot of basic research on wood has been carried out using different processes at home and abroad, mainly including the following two aspects of work: one is the use of organic resins The main problems are that the hot pressing process is complicated, the storage period of the resin is short, the compounding of the medicaments is difficult or the stability of the compounding medicaments is poor, There are VOCs that are harmful to human health; the second is inorganic filling, and the inorganic modifier is injected into the interior of the wood to obtain an inorganic composite material.

For example, the gel-sol method is used to prepare ceramic wood, and a single water glass is used as a modifier to prepare inorganic composite materials. However, when the gel-sol method is used, the storage period of the precursor is short and the agent cannot be reused. At the same time, material properties deteriorate over time

When a single water glass is used as a modifier to prepare an inorganic composite material, the chemical loss resistance is poor