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

A technology of negative oxygen ions and composite materials, used in wood treatment, wood impregnation, wood impregnation, etc., can solve problems such as the reduction of negative oxygen ions, and achieve the effects of easy control of conditions, promotion of metabolism, and enhancement of body disease resistance.

Inactive Publication Date: 2018-09-28
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem in the prior art that the photogenerated electrons and holes produced by nano-titanium dioxide under the irradiation of visible light recombine, so that the negative oxygen ions produced are reduced.

Method used

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

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Embodiment 1

[0019] According to this embodiment, a wood-based composite material that releases negative oxygen ions under visible light irradiation 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 described wood-based composite material that releases negative oxygen ions under visible light irradiation is that untreated wood is pressure-impregnated into a functional wood modifier of graphene oxide, nano-silica, and nano-titanium dioxide, and finally Wash and dry to get.

[0021] The beneficial effects of this embodiment are: 1. The forbidden band width of nano-titanium dioxide is relatively wide, and it is easy to generate photogenerated electrons and hole recombination under visible light irradiation, so that the negative oxygen ions produced are reduced. In order to suppress the photogenerated electrons and hole recombination and improve Charge mobility, t...

Embodiment 2

[0026] The difference between this embodiment and specific embodiment one is: the described functional wood modifier is prepared according to the following steps: first design two pre-experiments, a. take GO (0.25wt%)+SiO 2 (30wt%) mixed, stirred evenly with an electromagnetic stirrer, pressurized and impregnated to treat the substrate, and tested the physical properties such as bending resistance, hardness, water absorption, thermal stability, and adsorption capacity of the composite material obtained, so that according to the comprehensive performance Performance determines the better ratio; b. Take GO (0.25wt%)+TiO 2 (0.8wt%) mixed, stirred evenly with an electromagnetic stirrer, pressurized and impregnated the substrate, tested the performances such as negative oxygen ion release, harmful gas absorption, and antibacterial properties of the composite material obtained, and determined the optimal ratio. SiO 2 (30wt%)+TiO 2 (0.8wt%)+GO (0.25wt%) were mixed, and mixed evenly...

Embodiment 3

[0029] The difference between this embodiment and one of the specific embodiments one or two is that the wood loaded with functional wood modifier is prepared according to the following steps: the base material is fixed on a pulse impregnation machine, and the modifier is pneumatically A diaphragm pump provides pulsating pressure to be injected from one side of the substrate. Select the growth direction of the wood as the direction of pulse inclination, the trunk and the low molecular modifier will flow out from the other side of the wood, and after 30 minutes, the sap in the xylem is gradually replaced by the latest functional wood modifier. After impregnation, the obtained wood was dried in the air for 48 hours, and then transferred to an oven for drying. The drying temperature was 90° C., the drying time was about 200 hours, and the wood pressure was 0.2 MPa.

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Abstract

The invention relates to a wood-based composite material releasing negative oxygen ions under visible light irradiation and a preparation method thereof. According to the wood-based composite materialreleasing negative oxygen ions under visible light irradiation and the preparation method thereof, the number of generated negative oxygen ions is reduced due to the combination of photo-generated electrons and holes generated under visible light irradiation. The wood-based composite material releasing negative oxygen ions under visible light irradiation is irradiated by visible light with the wavelength of 380nm-780nm for 60-300min, and the number of released negative oxygen ions is more than 2500 / cm<2>. The preparation method comprises the steps of 1, preparation of a functional wood modifying agent; and 2, preparation of wood loaded with the functional modifying agent.

Description

technical field [0001] The invention relates to a wood-based composite material releasing negative oxygen ions under visible light irradiation and a preparation method thereof. Background technique [0002] Negative oxygen ion is a negatively charged oxygen ion, which has the functions of dust removal, deodorization and antibacterial. At the same time, it also has the functions of improving the environment and treating diseases, improving cardiopulmonary function, promoting metabolism, and enhancing the body's disease resistance. It is known as "air vitamin". Wood-based materials, as a commonly used interior decoration material, are closely related to our lives. In response to the call of the "Eighteenth Five-Year Plan", the research and development of green and environmentally friendly wood-based materials has become a hot spot again. [0003] Nano-titanium dioxide can be activated under the action of visible light and generate free radicals with high catalytic activity...

Claims

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Application Information

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IPC IPC(8): B27K5/00B27K3/08B27K3/32B27K5/04
CPCB27K3/08B27K3/32B27K5/003B27K5/04
Inventor 蒲俊文周紫荆韩小帅杨展贺宇祺
Owner BEIJING FORESTRY UNIVERSITY
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