Modification method for reinforcing chemical strength of birch

Abstract

The invention belongs to the technical field of birch processing, and particularly relates to a modification method for reinforcing the mechanical strength of birch. The method comprises the following steps: (1) pretreating birch; (2) modifying birch, preparing a modifying agent from the following raw materials: chitosan, ferrous sulfate, copper acetate, potassium tartrate, locust bean gum, disodium dihydrogen pyrophosphate and water; and (3) freezing and drying. The method can be used for effectively improving the polymerization degree among birch molecules and reinforcing the structural stability, the birch cannot be easily cracked or warped, and the modifying agent is cured in the birch after birch is subjected to preheating and vacuum high-pressure treatment, so that the strength of birch is greatly improved, and ingredients of the modifying agent cannot be easily lost. Furthermore, gaps in the birch are filled with the modifying agent, so that the inside of the birch is full, and weight gaining effect is remarkable; the modifying agent performs a crosslinking reaction with hydroxy in birch, the number of hydroxy is reduced, the water absorbability of birch is reduced, and the dimensional stability, biological corrosion resistance and weather resistance are improved.

Description

Technical field [0001] The invention belongs to the technical field of birch processing, in particular to a modification method for enhancing the mechanical strength of birch. Background technique [0002] The birch wood is light brown to reddish brown, with shiny surface and smooth mechanism, yellowish white with slightly brown, obvious growth rings, pure wood body, slightly heavier and harder, fine structure, elasticity, high moisture absorption, and mechanical strength It is not ideal, it is easy to crack and warp when dry, and it is not very durable in an environment that is prone to decay. Birch is usually used for special plywood, flooring, furniture, pulp, interior decoration materials, vehicle and ship equipment, plywood, etc. The furniture made is smooth and wear-resistant, but Its mechanical strength cannot meet the required requirements; therefore, inventing a modification method to enhance the mechanical strength of birch can greatly improve the utilization and qualit...

AI Technical Summary

Problems solved by technology

[0002] The wood of birch is light brown to reddish brown, with shiny surface and smooth mechanism, yellowish white slightly brown, obvious annual rings, pure and fine wood body, slightly heavy and hard, fine structure, high elasticity, high hygroscopicity and mechanical strength It is not ideal, it is easy to crack and warp when dry, and it is not very durable in an environment that is prone to decay. Birch is usually used in special plywood, flooring, furniture, pulp, interior decoration materials, vehicle and ship equipment, plywood, etc. The furniture made is smooth and wear-resistant, but Its mechanical strength cannot meet the required requirements; therefore, inventing a modification method to enhance the mechanical strength of birch can greatly improve the utilization rate and use quality of birch