粉石英基生态涂料的甲醛净化及影响机制研究

发布时间：2018-04-15 16:54

本文选题：粉石英/纳米TiO2 + 复合粉体　；参考：《西南科技大学》2015年硕士论文

【摘要】：本文深入探究了粉石英基生态涂料的甲醛净化机制及其影响因素。针对粉石英/纳米Ti O2复合粉体,研究了其催化氧化去除甲醛的相关机制,并通过了FT-IR、SEM、TGA等方法进行表征,研究了粉石英与纳米Ti O2在甲醛净化涂料中的协同增强效应;研究涂料中负离子粉对甲醛净化率的影响机制;同时研究了气候条件对粉石英基生态涂料净化甲醛的影响,研究颜色对粉石英/纳米Ti O2涂料甲醛净化性能的影响。结果表明:(1)经过混合球磨后,粉石英与纳米Ti O2之间发生了键合,形成了Si-O···Ti或Ti-O···Si桥中的分子间作用键,其红外波峰可能位于903cm-1左右,且其球磨时间越长,其峰的位置越向高波数位置处偏移;粉石英对Ti O2具有一定的分散作用,通过提升其光催化作用点位,大大提高其甲醛净化率;负离子粉的加入能使涂料具有一定的甲醛净化能力,特别是夜间净化能力,与纳米Ti O2之间存在一定的互补效应。(2)气候因素影响大小依次为湿度光照强度温度,随着湿度增大甲醛净化率单调升高,随着光照强度增大甲醛净化率先升后降,随着温度升高甲醛净化率先降后升;设定条件为我国两个特征湿度下,甲醛净化速率非常快,在2h内净化率即可达到90%左右,甲醛的净化效率是高湿度高于低湿度,夜间无光情况下,甲醛净化效率高达93%。(3)扫描电镜也看出粉石英可以改善Ti O2的分散效果,涂料的多孔材料的吸附甲醛能力与负离子粉释放负氧离子催化氧化甲醛的共同作用,使得其在夜间仍具有很高净化率,而且其夜间吸附的甲醛又能在白天被快速催化氧化,恢复吸附功能,这造就了本涂料超级的净化甲醛持久能力。(4)颜色对粉石英/纳米Ti O2涂料甲醛净化性能的影响,与未加颜色的对比样96%甲醛净化性能相比,有色涂料甲醛净化率都有所降低,红、橙、绿、兰、紫甲醛净化性能基本一致,为93.2%左右,降低了3个百分点,黄色和黄绿色的甲醛净化性能降低较多,在90%左右,降低6个百分点;黄绿色和黄色对近紫外光的吸收相对要强一些,对涂料甲醛净化率的影响要大一些;颜料点位占据涂膜表面,减少Ti O2催化氧化的点位,会一定程度降低涂膜的氧化降解效果,另一方面涂料的颜色越深,吸收可见光越多,涂膜温度也会略微升高,有助于提高光催化反应速度,然而最终共同作用的结果使有色涂料的甲醛净化性能有所降低。本论文研究的内容对该涂料产品改进有较好的指导作用,还能促进产品的推广应用与升级,带动该涂料产品的多元化发展,创造良好的经济和社会价值。
[Abstract]:In this paper, the mechanism of formaldehyde purification and its influencing factors of powdered quartz-based ecological coatings were studied.The mechanism of formaldehyde removal by catalytic oxidation of powdered quartz / nano-TiO _ 2 composite powder was studied. The synergistic enhancement effect of powdered quartz and nano-TiO _ 2 in formaldehyde purifying coating was studied by means of FT-IRU SEMGA and other methods.The influence mechanism of negative ion powder on formaldehyde purification rate and the effect of climate conditions on formaldehyde purification of powdered quartz based ecological coatings were studied, and the effect of color on formaldehyde purification performance of powdered quartz / nano TIO 2 coatings was studied.The results show that after mixed ball milling, the bond between powdered quartz and nano-TiO _ 2 is formed, and the intermolecular interaction bond in Si-O Ti or Ti-O Si bridge is formed. The infrared wave peak may be about 903cm-1, and the longer the milling time is, the longer the ball-milling time is.The position of the peak shifts to the position of high wave number, and the powder quartz has a certain dispersing effect on TIO _ 2, which can greatly improve the efficiency of formaldehyde purification by increasing the photocatalytic action point of TIO _ 2.The addition of anion powder can make the coating have a certain formaldehyde purification ability, especially at night, and there is a certain complementary effect between the coating and nano-TiO _ 2) the influence of climatic factors is humidity, light intensity and temperature.The purification rate of formaldehyde increases monotonously with the increase of humidity, increases with the increase of light intensity, and then decreases with the increase of temperature.The purification efficiency of formaldehyde is higher than that of low humidity in 2 hours. Under the condition of no light at night, the purification efficiency of formaldehyde is as high as 93.0.The SEM also shows that powdered quartz can improve the dispersion effect of TIO _ 2.The adsorption ability of the porous material of coating and the negative ion release of anion to catalyze the oxidation of formaldehyde make it still have a high purification rate at night, and the formaldehyde adsorbed at night can be quickly oxidized by catalysis during the day.The adsorption function was restored, which resulted in the effect of color on formaldehyde purification performance of quartz / nano-TiO _ 2 coating, which was compared with 96% formaldehyde without color contrast.The purifying rate of formaldehyde in non-ferrous coatings was all decreased. The purifying performance of red, orange, green, blue and purple formaldehyde was basically the same, about 93.2%, which decreased by 3 percentage points. The purification performance of yellow and yellowish green formaldehyde decreased more, about 90%.The absorption of near ultraviolet light by yellowish green and yellow was stronger than that of yellow, and the effect on the purification rate of paint formaldehyde was greater. The spot position of pigment occupied the surface of coating film and reduced the point of catalytic oxidation of TIO 2.On the other hand, the darker the color of the coating, the more visible light it absorbs, and the higher the film temperature will be, which will help to improve the speed of photocatalytic reaction.However, the final result of the joint action of the color paint formaldehyde purification performance has been reduced.The content of this paper has a good guiding effect on the improvement of the coating product, it can also promote the application and promotion of the product, promote the diversified development of the coating product, and create good economic and social value.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ630.1;X51

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