以粉煤灰沸石制備外墻隔熱保溫涂料的實驗研究
發(fā)布時間：2019-01-26 08:48
【摘要】：建筑節(jié)能對于我國的能源安全來說非常重要,外墻隔熱保溫涂料是實現(xiàn)建筑節(jié)能的方式之一。粉煤灰作為主要工業(yè)固體廢棄物之一,其中的漂珠及其工業(yè)產品可以作為外墻隔熱保溫涂料的功能填料。本文以粉煤灰為原料,采用兩步法合成粉煤灰沸石；通過單因素實驗,確定最佳的工藝條件；然后以合成的沸石為功能填料制備建筑隔熱保溫涂料,考察該涂料的導熱系數(shù)及其隔熱性能。主要研究內容和結論如下：(1)以粉煤灰合成沸石,對影響合成沸石的因素,氫氧化鈉濃度、液固比、硅鋁比及結晶溫度進行單因素實驗,得出合成低導熱系數(shù)的粉煤灰沸石的最佳工藝條件為：氫氧化鈉濃度3 mol/L,液固比10：1,硅鋁比為2,結晶溫度為120℃。在此條件下合成的粉煤灰沸石的孔容積最大,為0.148 m3/g,導熱系數(shù)最小,為0.153 W/(m·k),符合國標中保溫材料的條件。(2)以粉煤灰沸石為功能填料,制備建筑隔熱保溫涂料,得到最佳的基礎配方：苯丙乳液30 g,水25 g,纖維素0.3 g,鈦白粉25 g,分散劑0.1 ml,潤濕劑0.1 ml,功能填料10 g；同時對配方中的顏料濃度PVC進行了確定,發(fā)現(xiàn)當PVC為40%時,絕對升溫可降低5℃。以此條件下制備出的涂料符合相關行業(yè)的國家標準。(3)考察了涂層厚度對涂料隔熱性能的影響,以排除對后續(xù)實驗的影響。實驗結果表明：涂一道、兩道及三道時平衡溫度沒有顯著性差異,即通過再次涂刷,增加涂層厚度后隔熱效果基本不變。為了驗證粉煤灰沸石涂料的隔熱性能,實驗選擇隔熱性能較好的粉煤灰漂珠及硅藻土為對比材料,制備隔熱保溫涂料,測試其隔熱性能,發(fā)現(xiàn)添加粉煤灰漂珠9%時,隔熱效果較好,平衡溫度降低了5℃；硅藻土的添加量為9%時,平衡溫度降低了7℃；沸石的添加量為9%時隔熱效果最好,此時平衡溫度降低了12℃。因此可以得出,粉煤灰沸石涂料隔熱效果最好。(4)為了進一步驗證粉煤灰沸石涂料的隔熱性能,開展了室外太陽光的模擬實驗,實驗結果表明：粉煤灰漂珠涂料的最大溫差達到12℃,硅藻土涂料達到12.8℃,粉煤灰沸石涂料達到14.7℃。進而證明了粉煤灰沸石涂料是一種很好的外墻隔熱保溫涂料。以上研究表明,以粉煤灰為原料,兩步法合成沸石,以此為功能填料制備的建筑外墻隔熱保溫涂料可以有效提高涂料的隔熱性能,同時,所制得的涂料符合相關行業(yè)的國家標準。
[Abstract]:Building energy conservation is very important for energy security of our country. Thermal insulation coating for exterior wall is one of the ways to realize building energy saving. Fly ash is one of the main industrial solid wastes, among which drifters and their industrial products can be used as functional fillers for thermal insulation coatings. In this paper, fly ash zeolites were synthesized by two-step method using fly ash as raw material, and the optimum technological conditions were determined by single factor experiment. Then the synthetic zeolite was used as the functional filler to prepare the thermal insulation coating for building, and the thermal conductivity and thermal insulation property of the coating were investigated. The main contents and conclusions are as follows: (1) the factors affecting the synthesis of zeolites, the concentration of sodium hydroxide, the ratio of liquid to solid, the ratio of silicon to aluminum and the crystallization temperature, are studied. The optimum conditions for synthesis of fly ash zeolites with low thermal conductivity were obtained as follows: sodium hydroxide concentration 3 mol/L, liquid-solid ratio 10: 1, silicon-aluminum ratio 2, crystallization temperature 120 鈩，
本文編號：2415319
[Abstract]:Building energy conservation is very important for energy security of our country. Thermal insulation coating for exterior wall is one of the ways to realize building energy saving. Fly ash is one of the main industrial solid wastes, among which drifters and their industrial products can be used as functional fillers for thermal insulation coatings. In this paper, fly ash zeolites were synthesized by two-step method using fly ash as raw material, and the optimum technological conditions were determined by single factor experiment. Then the synthetic zeolite was used as the functional filler to prepare the thermal insulation coating for building, and the thermal conductivity and thermal insulation property of the coating were investigated. The main contents and conclusions are as follows: (1) the factors affecting the synthesis of zeolites, the concentration of sodium hydroxide, the ratio of liquid to solid, the ratio of silicon to aluminum and the crystallization temperature, are studied. The optimum conditions for synthesis of fly ash zeolites with low thermal conductivity were obtained as follows: sodium hydroxide concentration 3 mol/L, liquid-solid ratio 10: 1, silicon-aluminum ratio 2, crystallization temperature 120 鈩，
本文編號：2415319
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