Wood-based composite material releasing negative oxygen ions and preparation method thereof

[0018] Example 1:

[0019] The wood-based composite material that releases negative oxygen ions under visible light irradiation described in this embodiment is irradiated with visible light with a wavelength of 380nm to 780nm for 60 to 300 minutes, and the number of negative oxygen ions released is greater than 2500/cm 2;

[0020] The wood-based composite material that releases negative oxygen ions under visible light irradiation is to press untreated wood into a functional wood modifier of graphene oxide, nano-silica, and nano-titanium dioxide, and finally Get clean and dry.

[0021] The beneficial effects of this embodiment are: 1. The band gap of nano-titanium dioxide is relatively wide, and it is easy to generate photo-generated electrons and holes recombination under visible light irradiation, so that the generated negative oxygen ions are reduced, in order to inhibit photo-generated electrons and holes recombination and improve The mobility of charge, the use of graphene oxide and nano-titanium dioxide to increase the release rate of negative oxygen ions;

[0022] 2. The wood modified by the nano-titanium dioxide/nano-silica/graphene oxide composite modifier of this embodiment can release negative oxygen ions under visible light irradiation;

[0023] 3. Negative oxygen ion is a kind of negatively charged oxygen ion, which has the functions of dust elimination, deodorization and antibacterial. At the same time, it also has the functions of improving the environment and curing diseases, can improve the heart and lung function, promote metabolism, and enhance the body's disease resistance. It is known as "air vitamin". As a commonly used indoor decoration material, the present invention prepares a green and environmentally friendly wood base material;

[0024] Fourth, this embodiment has wide sources of raw materials, simple preparation methods, and easy control of conditions.

[0025] Example 2:

[0026] The difference between this embodiment and the first embodiment is that the functional wood modifier is prepared according to the following steps: first design two pre-experiments, a. take GO (0.25wt%) + SiO 2 (30wt%) mix, stir evenly with an electromagnetic stirrer, pressurize and impregnate the substrate, test the physical properties of the composite material, such as bending and compression resistance, hardness, water absorption, thermal stability, adsorption capacity, etc., according to the comprehensive performance The performance determines the better quantity ratio; b. Take GO(0.25wt%)+TiO 2 (0.8wt%) mix, stir evenly with an electromagnetic stirrer, pressurize and impregnate the substrate, test the negative oxygen ion release, harmful gas absorption, antibacterial properties and other properties of the composite material obtained, determine the better quantity ratio, and select it SiO 2 (30wt%)+TiO 2 (0.8wt%)+GO (0.25wt%) mixed and mixed uniformly with an electromagnetic stirrer to form a stable solution.

[0027] The concentration of graphene oxide is 0.25% by weight, the concentration of nano-silica is 30% by weight, and the concentration of nano-titania is 0.28% by weight. Others are the same as the first embodiment.

[0028] Example 3:

[0029] The difference between this embodiment and one of the specific embodiments 1 or 2 is that the wood loaded with functional wood modifier is prepared according to the following steps: the substrate is fixed on the pulse dipping machine, and the modifier is pneumatic The diaphragm pump provides pulse pressure to be injected from one side of the substrate. The growth direction of the wood is selected as the pulse tilt direction. The trunk and the low-molecular modifier will flow out from the other side of the wood. After 30 minutes, the sap of the xylem will be gradually replaced by the latest functional wood modifier. After immersion, the obtained wood is treated for 48h in the air drying process, and then transferred to a drying box for drying. The drying temperature is 90°C, the drying time is about 200h, and the wood pressure is 0.2MPa.