What are the treatment methods for preservative wood?

Wooden bridges, wooden pavilions, waterside plank roads, and wooden fences made of antiseptic wood can be seen everywhere in parks, real estate communities, and scenic spots. They embellish the construction of cities and make people's dreams of returning to nature come true. With the improvement of consumers' environmental awareness and the continuous pursuit of returning to and reshaping nature, more and more consumers are willing to choose wood as a natural product, and hope that it will have a long service life.

So, what are the steps of antiseptic wood treatment? Wood dryingAfter a processing and drying process, the cell structure of the wood is relatively fixed, which reduces the degree of wood cracking and deformation, and is more conducive to the immersion of preservatives.

Step 2: Vacuum high-pressure impregnation process is the key step of antiseptic treatment, when Fitwell first realizes the physical process of driving the preservative into the wood inside, and at the same time completes the chemical reaction process of part of the preservative active ingredients and starch, cellulose and sugar in the wood, thereby destroying the living environment of bacteria and insects that cause wood rot, and effectively improving the outdoor antiseptic wood performance of wood. Step 3:

Vacuum agent, this process is the most redundant preservative, can reduce the amount of agent, the most important thing is to meet the requirements of environmental protection. Step 4: Equipment drying Natural air drying After treatment, it is naturally dried for 7 days, and then it enters the drying kiln, or directly and naturally dried, so as to ensure that the preservative components are fully fixed in the wood, so as to avoid changes in the process of use.

Step 5: After the processing and shaping of the anticorrosive wood is dried by the equipment, the moisture content needs to be balanced. After the moisture content is balanced, it is reprocessed according to the requirements to produce a variety of preservative wood products.

The main method of preservative treatment of wood in the world is to use a water-based preservative that is not suitable for dissolution, and at the same time apply pressure to the wood in a closed vacuum tank, the preservative is injected into the wood fiber. After pressure treatment, the wood is more stable, and the preservatives can effectively prevent the attack of mold, termites and insects on the wood.

As a result, the treated wood has excellent corrosion resistance for long-term use in harsh outdoor environments. In addition, anticorrosive wood can not only wax, but also can be used to apply paint for anti-corrosion treatment, pre-treatment of anti-corrosive wood before brushing wood oil due to the particularity of the material of the wood itself, the surface is sometimes not very smooth, at this time brushing wood oil will waste a lot of wood oil, and after the wood oil is dry, the brightness of anti-corrosive wood is not enough, and the expected effect can not be achieved, in order to avoid similar things from happening, the wood must be polished bright before brushing the wood oil, and the oil and dust are removed after brushing the oil.

Anticorrosive wood has gradually entered our lives, and anticorrosive wood is a natural and environmentally friendly material. In daily life, the use of anticorrosive wood planks makes the effect after decoration can be maintained for a long time, under normal circumstances, some external anticorrosive treatment will be carried out for anticorrosive wood planks when used, and the anticorrosive wood building materials are treated by waxing, so as to improve the smoothness of the surface of anticorrosive wood building materials and the moisture-proof performance of anticorrosive wood building materials. Today, let's take a look at the surface treatment knowledge of antiseptic wood.

Pay attention to the cleaning of the floor surface before waxing, and choose to wipe off the surface floor dust and water stains with a dry cotton cloth on a sunny day.

There are two ways to prevent wood corrosion, one is to paint the wood grain paint that forms a film, which has the advantage of hard and bright surface, and is not easy to repair after damage;

One is the wood wax oil that cannot be coated with a film, which has the advantage of reflecting the grain of the wood itself and is easy to repair, and the disadvantage is that the surface lacks luster.

1. Smearing method;

2. Immersion tank method;

3. Hot and cold trough method;

4. Paste application method;

5. Wrapping anti-corrosion method;

6. Living tree treatment, etc.

1. Asphalt anticorrosion: first spray some water on the surface of the wood, but do not put the wood directly in the water, as long as the water content of the wood should be more than 40%, and then dilute the asphalt, evenly spread the diluted asphalt on the wood, and dry it in a cool and ventilated place.

2. Sodium fluoride antiseptic: bury the wood in the contact position between the telephone pole and the soil, and then apply the sodium fluoride solution on the surface of the wood, and cover it tightly with plastic film after application.

3. Oil preservatives, such as antiseptic oil and coal tar, can also be used to evenly apply these preservative oils on the surface of the wood, which can prevent the wood from rotting and being eaten by insects.

Clause.

1. Wood antiseptic treatment method - soaking method. At room temperature and pressure, the wood is soaked in a tank or pool containing the preservative solution, and the wood is always below the liquid level. The soaking time depends on the tree species, wood specifications, moisture content and type of agent, and is subject to the specified amount of agent retention and penetration.

In order to improve the treatment effect, ultrasonics, heating devices, and surfactants can be added to the soaking solution to improve the permeability of the wood. Depending on the length of immersion, the immersion method can be divided into instantaneous immersion (a few seconds to a few minutes), short-term immersion (a few minutes to hours) and long-term immersion (a few hours to 1 month). Suitable for veneer and remedial preservative treatments, as well as temporary wood.

Clause. Second, wood preservative treatment method - diffusion method. According to the principle of molecular diffusion, with the help of the moisture in the wood as the carrier of the diffusion of the agent, the agent diffuses from high concentration to low concentration and spreads to the deep layer of the wood. For this reason, the diffusion method of antiseptic treatment of wood must meet the following conditions:

1. The moisture content of small timber is high enough, usually more than 35% and 40%, and the raw timber is the best;

2. Water-borne agent (diffusion type), high solubility and slow curing;

3. The ambient temperature and humidity are high. According to the operation process, the diffusion method can be divided into slurry diffusion method, impregnation or spray diffusion method, strap diffusion method, borehole diffusion method (or drip diffusion method) and two-agent diffusion method. The diffusion method has less investment in equipment and simple production process.

It is easy to be applied and promoted in the vast rural areas. Similar to this method is the sap replacement method.

Answer 1, chemical preservative: refers to the addition of wood preservative, the use of a non-soluble water-based preservative, in a closed vacuum tank to apply pressure to the wood at the same time, the preservative into the wood, so as to achieve the effect of inhibiting the reproduction of wood rot fungi.

2. Natural antiseptics: refers to the addition of wood preservatives to reduce the moisture content of wood, usually the moisture content of wood is less than 18%, wood rot bacteria can not reproduce, wood is placed in a ventilated place to avoid moisture.

3. Anti-corrosion of hot and cold groove: put the wood into the hot solution for heating, according to the principle of thermal expansion and contraction, there will be a pressure difference inside the wood, which can overcome the osmotic resistance, and when the internal pressure of the wood is greater than the atmospheric pressure, the wood will be put into the cold tank immediately, and the air inside the wood will shrink when it is cold, so as to produce negative pressure, so that the cold liquid can easily enter the wood, so as to achieve the purpose of anti-corrosion.

Wood decay is essentially a biological phenomenon, which is reflected in the decomposition of the wood cell wall by fungi in nature, causing wood mold, and the fungal species that are easy to cause wood mold include Trichoderma, Penicillium, and Mucor. Whether the wood is in the natural environment or cut down for storage, as long as it is in a warm and humid climate, in the case of poor ventilation, the mold spores on the surface of the wood will multiply, and then promote the growth of mold and mildew in the wood.

Hope it helps, dear

The exterior is mainly treated to block the contact of the wood with oxygen, water or some other factors (organisms, etc.). Such as paints, varnishes, and many more.

Through vacuum and high-pressure impregnation, the physical process of driving the preservative into the wood is first realized, and the chemical reaction process between the active ingredients of part of the preservative and the starch, cellulose and sugar in the wood is completed at the same time. It destroys the living environment of bacteria and insects that cause wood decay.

Anticorrosive oil, lacquer impregnation, lacquering, moisture-proof ,...

Chemical preservative refers to the application of preservatives on the surface of wood to penetrate into the wood and form a protective film, so as to achieve the purpose of antiseptic. Common preservatives that are resistant to corruption include coal tar, wood preservatives, copper, chromium, arsenic, etc. This method can effectively prevent wood decay, but it has a certain amount of pollution to the environment.

Biopreservative refers to the use of natural biocides to prevent wood from rotting. Common biocides include fungi, bacteria, etc. This method does not pollute the environment, but requires professional skills.

In conclusion, antiseptic is an important measure to prolong the service life of wood. When choosing an antiseptic method, it is necessary to choose a suitable method according to the actual situation, and pay attention to the environmental protection of the preservative.

Biopreservative refers to the use of natural biocides to prevent wood from rotting. Common biocides include fungi, bacteria, etc. This method does not pollute the environment, but requires specialized skills.

1. The smearing method is the easiest and easiest way to do, which is to apply crusu oil to the surface of the wood with a brush. However, because the immersion depth is very small, the effect is not large, and it can only play an antiseptic role in a short time.

2. The equipment of the dipping tank method is simple, and only one ash or steel plate groove is needed. In the tank, a concentration of 2%-4% cold or hot sodium chloride water-soluble preservatives is contained. The pine wood with a moisture content of 25% to 30% is then immersed in the tank for 6 to 7 days.

After removal, apply paint, coal tar or bitumen as a waterproofing layer. This method is much more potent than the smearing method. If the amount of treated wood is not large, it can be used.

3. The hot and cold slag hail trough method is more advanced than the above method. Use one or two tanks, first take a preservative of 95 degrees Celsius (mixed from 60% to 70% of crusu oil and 30% to 40% of coal tar), soak the wood with a moisture content of 25% for 4 hours to make the wood cells expand; The wood is then immersed in a cold preservative at 45 degrees Celsius for 3 hours to allow the preservative to soak into the cells that have swelled. This method has little equipment cost and good treatment effect, but the output is small and the fuel consumption is more.

4. The slurry application method is to coat the wood with a water content of more than 40% (44% sodium fluoride, 13% clay and 20% coal tar), and then coat the waterproof layer of asphalt preparation or asphalt paint after drying to prevent the outflow of the agent; The well makes the agent rely on the action of water, and continues to expand the beam to penetrate into the wood. This method is simple and can extend the life of wood by 2-3 years. At present, a small part of railway sleepers are used.

5. The wrapping anti-corrosion method is to coat the roots of the tree or the buried electric pole in contact with the soil, coated with sodium fluoride aqueous solution inside, and coated with a waterproof layer on the outside. In this way, after two months, the immersion depth can reach one or two centimeters.

6. The living tree treatment method is used to process precious and scarce wood, and is ready to make noble equipment in the future. The treatment method is to set up a container on the tree 8 to 9 decimeters above the ground a few months before the tree is cut down, and hang a container with preservatives inside. When the tree absorbs moisture from the ground, it also inhales preservatives.

After about 1 to 2 months, the tree was poisoned, the leaves withered and yellowed, and the tree itself dried up. This method also controls the color of the wood used. However, 30% to 40% of the preservatives are wasted on leaves and veins, and the cost is relatively high.