After all, solid wood resources are limited. To make outdoor furniture wood have good performance and alleviate the contradiction between the supply and demand of wood resources, researchers have developed outdoor wood products.
1. Preservative wood
Preservative wood is the addition of chemical preservatives to ordinary wood, to achieve the effects of anti-corrosion, moisture-proof, fungus-proof, waterproof, and insect-proof. There are generally two treatment methods for preservative wood, namely, high-pressure dipping tank treatment and non-pressure dipping tank treatment. Among them, the high-pressure impregnation method is the most commonly used. This method is to add preservatives to the wood after drying, curing, and polishing, and react under vacuum conditions so that the preservatives can enter the wood cells and be permanently fixed to achieve the effect of anti-corrosion and insect control.
The preservatives are mainly CCA with the chemical composition of chromate copper arsenate. The chemical properties of CCA are very stable, but because the trace amount of arsenic may cause harm to the human body, most developed countries have banned the use of this preservative. Another kind of preservative is ACQ whose chemical composition is mainly alkyl cuproammonium compounds. Its active substance is ammonium, which can be degraded and has relatively little pollution to the environment.
2. Carbonized wood
Carbonized wood is wood obtained after heat treatment at 160°C to 250°C in a medium such as inert gas, water vapor, or oil. This high-temperature treated wood can form a stable intertwined structure, which greatly improves the stability, and the volatilization of the extract reduces the food of decaying fungi and improves the performance of antiseptic and antibacterial. Compared with the chemically modified preservative wood mentioned above, this modification method does not use chemicals and is a more environmentally friendly modification method.
3. Wood-plastic composite materials
Wood-plastic composite materials are made of wood fiber or plant fiber as the main material, mixed with polyethylene, polypropylene, polyvinyl chloride, and other polymer compounds, adding coupling agents and additives, and compounding materials through a series of processes. This material has high hardness, high strength, degradability, and excellent waterproof and moisture-proof performance. It can also effectively prevent mildew and insects. It is an excellent outdoor furniture material.
my country's functional outdoor furniture wood has been widely used and can meet the basic requirements of waterproof, sunscreen, and insect-proof. However, it needs to be strengthened in terms of environmental protection. Based on saving wood resources, the chemical modification should reduce the use of materials that will pollute the environment. Pharmacy, is a truly green and environmentally friendly outdoor furniture material.