耐光老化重組竹制備與性能表征
[Abstract]:Recombinant bamboo is one of the main industrial products in the development of bamboo industry in China. With the development of large-scale beautiful China and ecological civilization construction in China, outdoor recombinant bamboo has become one of the most potential areas for development. In the outdoor application of recombinant bamboo, environmental factors such as sunlight, moisture and oxygen accelerate the aging of materials, seriously affect the physical and chemical properties of recombinant bamboo, limit the utilization range of recombinant bamboo and shorten the service life of recombinant bamboo. In this paper, the optimum density and heat treatment technology of outdoor recombinant bamboo were studied, and the weatherability of outdoor recombinant bamboo was improved by combining the existing production technology of outdoor recombinant bamboo. An ultraviolet shielding system was established to prepare the light-aging resistant recombinant bamboo and its aging properties were studied. The effects of density on the properties of the recombinant bamboo were studied by means of Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectrophotometer (UV-Vis), scanning electron microscopy (SEM), thermal analysis (TGA/DSC), mass spectrometry (MS). The main conclusions are as follows: (1) Density has a significant effect on the physical and mechanical properties and light aging resistance of outdoor recombinant bamboo. The increase of density of recombinant bamboo improves the mechanical properties and chroma and surface wettability during light aging. High density has advantages and disadvantages on the physical and chemical properties of the bamboo. Considering the density of 1.1 g/cm 3, it is most suitable. (2) The study on the effect of heat treatment on the properties of enzymatic lignin reveals the mechanism of heat treatment improving the light aging resistance of Wood-bamboo materials. The decrease of ultraviolet absorbance is the main reason for the improvement of light aging resistance of bamboo by heat treatment. The results can be used for the selection of heat treatment process of bamboo. The results of FTIR and MS analysis showed that the lignin was gradually degraded into small molecular compounds during heat treatment, and the lignin was formed by high temperature heat treatment (220 C). Small molecule in the outdoor application is easily affected by environmental factors such as water, heat and so on. Therefore, the outdoor heat treatment temperature of recombinant bamboo is not suitable for too high. "UV shielding system" (anti-aging coating) has good UV (UVA and UVB) shielding property (> 99%) and visible light transmittance (> 90%). The photoaging test shows that the system can effectively reduce the aging rate of the system while protecting the substrate. The absorption of the coating can be predicted at different BTZ-1 concentration and coating amount by modeling. By controlling the concentration of BTZ-1 and the amount of coating, the shielding effect of the ultraviolet shielding system can be regulated. Based on the above model, the critical drug loading of BTZ-1 can be calculated with the value of 1.82.05 g/m~2. (4) The light-aging resistant recombinant bamboo was prepared by applying the UV paint-type "ultraviolet shielding system" to the outdoor recombinant bamboo. The stability of color, gloss and surface wettability of the product was improved. The gloss value of the light-aging-resistant bamboo was only 52% and 53% of that of the control bamboo. The ATR results showed that the light oxidation degree of the light-aging-resistant bamboo was obviously lower than that of the control bamboo.
【學(xué)位授予單位】:中國(guó)林業(yè)科學(xué)研究院
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TS652
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