人造板甲醛釋放規(guī)律、機(jī)理及處理方法研究
[Abstract]:Formaldehyde and total volatile organic compounds (TVOC) concentrations in rooms and public places of Guilin, Nanning, Liuzhou and other typical cities in Guangxi were measured by formaldehyde detector and organic gas detector. The indoor formaldehyde concentration distribution of wood-based panels was simulated by Airpak software. Formaldehyde emission from wood-based panels was predicted by double exponential decay model and iteration method, and the prediction model of formaldehyde emission from wood-based panels was established based on mass transfer theory. The pyrolysis kinetics and thermodynamics of wood-based panel urea-formaldehyde resin (UF) adhesive were studied by TG-DTG and DSC. The main conclusions are as follows: (1) The pollution degree of formaldehyde and TVOC in typical living rooms of Guilin is in turn as follows: study bedroom living room kitchen, the highest concentration is 0.898mg/kg, respectively. M3,1.532mg/m3; Nanning typical room formaldehyde pollution degree in turn: study bedroom living room, TVOC pollution degree in turn: bedroom study living room, the highest concentration of 0.901 mg/m3, 0.673 mg/m3; in public places, Liuzhou, Guilin shopping mall formaldehyde, TVOC concentration is higher, the highest concentration is 0.268 mg/m, 0.713 mg/m3, 0.713 mg/m3, respectively. 276 mg / m3,0.805 mg / m3. (2) The main indoor formaldehyde diffusion modes are free diffusion, turbulence and air convection. The indoor formaldehyde concentration distribution is directly related to pollution sources and airflow. The formaldehyde concentration near the middle passageway is lower than the national standard. The maximum concentration of formaldehyde was 0.198 mg/m3, 0.177 mg/m3 and 0.171 mg/m3, respectively. The maximum error between simulated value and measured value was 9.6%. (3) The formaldehyde release process of particleboard, plywood, density board, large core board and solid wood board can be divided into three stages: rapid release, slow release and saturation release. The aldehyde concentration increases with the increase of ambient temperature, humidity, thickness and loading rate, and decreases with the increase of air exchange rate. The highest concentrations are 0.428 mg/m3, 0.377 mg/m3, 0.345 mg/m3, 0.213 mg/m3, 0.023 mg/m3, respectively. (4) The diffusion coefficient D of formaldehyde in the wood-based panel increases with the increase of ambient temperature, humidity or air exchange rate. The maximum errors between the predicted concentrations of formaldehyde emission from particleboard, plywood and density board and the experimental values were 15%, 20%, 12%. (5) The order of influencing formaldehyde removal efficiency of wood-based panels was: the relative humidity of treatment temperature and air exchange rate of treatment time; The optimum removal process is as follows: treatment temperature, air exchange rate, treatment time, relative humidity is 95, 16.8 m3/h, 6 days, 35% RH, and the removal rate of formaldehyde is 63.2%. The effect of modifier on formaldehyde emission from UF glue is in the order of bentonite phenol Dicyclohexylcarbodiimide methylsilane. The optimum modification process is bentonite, methyl silicone oil, dicyclohexyl carbodiimide, phenol 10%, 10%, 3%, 3%, respectively. The formaldehyde emission of UF adhesive is reduced by 50.7%, and its thermal stability, bonding strength and water resistance are all improved. (7) The weight loss of UF samples before and after modification is 14.3% at 103 ~ 198 C, respectively. The average activation energiwere 222.292kJ/mol, 261.569 kJ/mol, 261.569 kJ/mol, and the pre-exponentfactor 1gA were 23.744 s-1, 30.264 s-1, Delta H, Delta S, Delta G were 217.72 kJ/mol, 196.23 J/ (mol-K), 109.84 kJ/mol mol, 284.97 kJ/mol, 284.97 kJ/mol, 284.97 kJ/mol, kJ/mol, 28 4.97 kJ/mol, kJ/mol, 30.97 kJ/mol, 1 gA were 23.744 s-1, 30.264 s-1, 30.264 s-1, 93.22 kJ/mo L.
【學(xué)位授予單位】:廣西師范大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TU531;X51
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