Can wood powder also make walls? This new material may be the mainstream in the future!
Wood is a renewable ecological material, which has the advantages of low environmental pollution, low processing energy consumption, natural degradation and other environmental protection advantages. Compared with traditional petrochemical material walls, wood is not only environmentally friendly but also more lightweight.
With the introduction of energy conservation and environmental protection policies in China, the use of various biomass renewable resources to prepare light, high-strength, good thermal insulation and low energy consumption wall materials to improve the defects of existing building materials, such as pollution is urgently needed .
The use of wood is an important means of developing a circular economy and building a conservation-minded society. According to statistics, the comprehensive utilization rate of timber in China is only about60%, While developed countries have reached80%the above. Foam wood wall is undoubtedly an alternative product of traditional wall, and has great development potential.
What is foam wood?
Wood foam is a light-weight, porous, high-strength material with low density and high insulation. It can replace the ubiquitous polystyrene foam and can play a good role in sound insulation and heat insulation as a wall material. It can also be applied to the middle layer in the sandwich panel of furniture or door panel parts.
What are the advantages of foam wood wall compared with traditional wall?
(1) Renewable and biodegradable. Due to the characteristics of wood itself, wood liquefied foam wall also has a very good environment-friendly performance.
(2) Light weight and high strength. Compared with traditional walls, the walls made of wood materials have the characteristics of light weight. Due to the interaction between the wood fibers, the strength of this material comes entirely from the fiber's own adhesion, rather than adhesives, which reduces Environmental issues caused by adhesive emissions.
(3) Thermal insulation. Foam wood is a porous material with small thermal conductivity and low thermal conductivity, and is a good thermal insulation material.
(4) Soundproof and shockproof. Due to its cell structure, foam wood also has good soundproof and shockproof functions, which is very suitable as a wall material.
But foam wood also has some defects, for example, it is not as stable as stone products in shape; with the use of time and temperature changes, the material is prone to moisture.
How is foam wood made?
The preparation of foam wood is roughly divided into the following steps: wood flour treatment, liquefaction, foaming.
The selection of wood powder is the first step in the preparation of foamed wood. The particle size of wood powder has a great influence on product performance. It is easier to foam when the particle size of wood powder is smaller, but it is easy to cause agglomeration, which leads to poor physical properties. The higher the filling of wood powder, the less easy to foam.
The production of foam wood can be traced back to the last century40At that time, people added carbonic acid to papermaking waste liquid to make it foam and solidify. The modern preparation method is to foam the wood powder after liquefaction.
Wood liquefaction is a kind of wood modification method. It chemically treats wood under normal pressure or pressurized conditions to convert wood lignin, cellulose and hemicellulose into liquid substances with certain reactivity. Used to prepare adhesives, foam plastics, fiber materials, etc.
The use of liquefied wood to prepare wall materials can reduce dependence on petroleum resources and achieve sustainable development with broad market prospects. The methods of wood liquefaction are divided into high temperature and high pressure liquefaction method, normal pressure solvent liquefaction method, super fluid liquefaction method.
Wood foaming is to add a foaming agent to the liquefied wood to promote its polycondensation, and then gasify under heat at a certain temperature. It makes it crosslink and solidify quickly while foaming, forming a uniform and fine cell structure. The proportion of foaming agent, auxiliary foaming agent, plasticizer and other components will also affect the foaming quality.
Foam wood is a novel material with high environmental value. It has huge room for development and is a product that replaces traditional wall materials. Not only can the raw materials be renewable, but also the effective use of small-diameter timber and waste wood is a product with sustainable development capabilities. This kind of material can not only keep heat and heat, but also have a certain anti-seismic ability, and its further development in the future will definitely be applied in the market.
Article source: Lu Banyuan
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