Treatment of wood preservative
Wood anticorrosion treatment has several different methods, including: smear method, dip tank method, hot and cold tank method, paste smear method, enveloping anticorrosion method, live tree treatment method, etc. Let's take a look at some of the different preservative methods.
1. Smear method is the most simple and easy method to do, it is the Cruthu oil with a brush on the surface of the wood. But because the immersion depth is very small, the effect is not big, only in a short time to play the role of anticorrosion.
2. Dipping trough method equipment is simple, only need a putty or steel trough. Fill the tank with a concentration of 2% to 4% cold or hot sodium chloride water soluble preservative. The pine, which is 25% to 30% water, is dipped into the tank for six to seven days. After taking out paint, coal tar or asphalt as a waterproof layer. This method is much more effective than the smearing method. Can be used if the amount of wood treated is not large.
3. The hot and cold tank method is more advanced than the above method. In one or two tanks, soak wood with 25% water content for 4 hours with a preservative (a mixture of 60%-70% Cruthu oil and 30%-40% coal tar) at 95 degrees Celsius to swell the cells; The wood was immersed in a cold preservative at 45 degrees Celsius for three hours to immerse the preservative into the expanded cells. This method cost little equipment, treatment effect is good, but small output, oil consumption.
4. paste smear method is the water content of more than 40% wood, coated with paste (sodium fluoride 44%, clay 13%, coal tar 20% preparation), dry and then coated with asphalt or asphalt paint waterproof layer, to prevent the outflow of agents; The well allows the agent to continue diffusing into the wood by the action of water. This method is simple and can prolong the life of wood by 2 to 3 years. At present the railway sleeper has a small part of the use.
5. The wrapping anticorrosion method is to put the roots or the buried poles in contact with the soil. The interior is coated with sodium fluoride water solution and the exterior is coated with waterproof layer. After two months, the immersion depth can reach 1.5 to 2 centimeters.
6. The live tree treatment method is used to treat rare and rare wood for future production of noble materials. The treatment is to hang a container with preservatives in it perforated 8 to 9 decimetres above the ground a few months before the tree is cut down. As trees absorb water from the ground, they suck in the preservatives. About a month or two, the tree is poisoned, the leaves turn yellow, and the tree itself dries out. This method can also control the color of the wood used. But 30 to 40 percent of the preservatives are wasted on the leaves and veins of trees, which is relatively high cost.
7. Other anticorrosive methods include borehole injection, wood end injection, diffusion, centrifuge oil injection and hot air resin decay.
According to different needs, people can use different embalming treatment, only in this way, in order to save the maximum amount of resources.
