Wood is a kind of natural biomaterial composed of cells and an organic complex composed of natural polymer compounds. Therefore, wood has both biological and chemical characteristics. Some of these characteristics are the root of wood decomposition and destruction, and some are closely related to the selection of wood protection treatment technology and the effect of protection and utilization, The following introduces several methods of wood preservation
1. Drying and anticorrosion
Only when the moisture content of wood is higher than 20%, the wood will not grow and reproduce, and eventually die naturally, and the wood will not be harmed, It is one of the effective measures to prevent wood decay
2. Moisturizing storage
引起木材腐朽的主要菌种是木腐菌,含水率为 20%-30% 的木材是绝大多数木腐菌寄生和繁殖的木材,该木材内部不仅具有木腐菌 生存所需的足够水分,还存在一定的空气,这样为木腐菌创造了生存条件,使其能够生存繁殖.尤其在阴暗潮湿环境中储存和使用的木材, 更易受到木腐菌的危害.
Wood rot fungi are the main bacteria causing wood decay. The wood with moisture content of 20% - 30% is the wood that most wood rot fungi parasitize and propagate. The wood not only has enough water for the survival of wood rot fungi, but also has certain air, which creates living conditions for wood rot fungi to survive and reproduce. Especially for the wood stored and used in dark and humid environment, It is more vulnerable to wood rot fungi
The moisture content of the wood harvested in winter and spring is 80% ~ 100%. During the storage of this kind of wood, we need to spray water regularly to make the water inside the wood not evaporate or less evaporate, and the wood is always in the state of water and humidity. In this way, the space inside the wood will be full of water and reduce the oxygen content, which will deteriorate the living environment of wood rot fungi and make it difficult for wood rot fungi to develop and reproduce, In order to prevent wood rot fungus from invading the wood, at the same time, it can also avoid wood cracking
3. Immersion storage
The moisture content of wood stored in water for a long time can reach more than 200%. The wet wood contains a lot of water, so it is lack of oxygen inside and does not have the living conditions of wood rot fungi. Therefore, the wood rot fungi can not parasitize in the wood. We can achieve the purpose of preservation by storing the wood in water. When the wood is stored in water, it should be completely immersed in the water and not float on the water surface, Otherwise, it will create the living conditions for the wood rot fungus
4. Anti corrosion sleeve painting
The common method is to paint asphalt oil on the surface of wood to isolate the wood from the outside air and prevent water from invading into the wood. This is also a common antiseptic method for building wood components, with low toxicity and less pollution
5. Change the pH value of wood
研究认为,木腐菌生长繁殖所需要的低酸碱度 (pH 值)为 4.5-5.5..木材在贮存过程中其含酸量会逐渐增加,所以绝大多数术材的 pH 值是在 4.0-6.5 之间,而当其 pH 值达到中性点即7 时,木材中的术腐菌就不能生长.所以,用碱性溶液处理木材,使木材 PH 值变成中性或弱碱性,可以破坏木腐菌的生存条件则可达到防腐之目的.
The results showed that the low pH value (pH value) required for the growth and propagation of wood rot fungi was 4.5-5.5. The acid content of wood would increase gradually during storage, so the pH value of most of the wood was between 4.0 and 6.5. When the pH value reached the neutral point, i.e. 7, the wood could not grow, It can destroy the living conditions of wood rot fungi and achieve the purpose of antisepsis