功能填料对中明度反射隔热氟碳涂层性能的影响

Inf luence of Functional Fillers on Performance of Ref lective Thermal-insulation Fluorocarbon Coating with Medium Brightness

使用水性氟碳树脂乳液配制了中明度反射隔热涂料,研究了亚微米级二氧化钛(Ti O2)、空心玻璃微珠等功能填料对反射隔热涂层性能的影响。涂层的隔热温差采用自制碘钨灯装置进行测试。涂层测试结果表明:随Ti O2填料用量的增加,涂层断裂伸长率、光泽度及其在混凝土基面的黏结强度均逐渐下降;当Ti O2填料用量增加至15 g后,涂层的抗拉强度开始明显下降;在涂料中添加空心玻璃微珠后,涂层的断裂伸长率和抗拉强度均会下降,但在微珠用量为2~5 g时变化较小;当空心玻璃微珠用量增加至3 g后,涂层光泽度(60°角)降低至20以下,呈哑光状态。隔热温差测试结果表明:Ti O2填料的加入提高了降温效果,当其用量达到10 g以后,继续增加填料用量对提高涂层反射隔热效果无明显影响;空心玻璃微珠填料的加入亦可提高降温效果,在本体系中的最佳用量为8 g。

The water-borne fluorocarbon resin emulsion was used to make up reflective thermal-insulation coatings with medium brightness. The influences of functional fillers including submicron titanium dioxide(TiO 2) and hollow glass beads on the performance of reflective thermal-insulation coatings were investigated. Self-made iodine lamp device was applied to gain the temperature difference of coatings. The test results show that elongation at break,gloss and adhesive strength to concrete surface of coatings decrease with the increasing amount of TiO 2 fillers.When the amount of TiO 2 fillers increases to 15 g, coating tensile strength obviously decreases. After the addition of hollow glass beads into the coating,elongation at break and tensile strength of coatings decrease. But there is no obvious change when the dosage is 2 ~ 5 g. When the amount of glass beads increases to 3 g,the gloss of coatings(60° angle) reduces to below 20. Thermal-insulation temperature difference test show that the added TiO 2 fillers could improve cooling effect. However,when the amount reaches 10 g,the reflective thermal-insulation effect is not obvious. The added hollow glass bead filler could also increase cooling effect,and the optimized dosage is 8 g.