改性硅溶胶—苯丙乳液反射隔热涂层的制备及性能

Effect of Functional Pigments on Thermal Insulation and Energy Saving Properties of Modified Silica Sol Styrene-acrylic Emulsion Composite

摘要:

采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对碱性纳米硅溶胶进行接枝改性，与苯丙乳液复合，制备节能涂层成膜基料，再分别加入金红石型钛铬黄及刚玉型铬绿颜浆，制备了两类彩色隔热节能涂层。探究了不同功能颜料种类及掺量条件下复合涂层的节能性能及隔热机理。结果表明，使用KH560对硅溶胶改性后，硅溶胶平均粒径由987.3nm降低到72.3nm,Zeta电位绝对值提高了29.7ev,且在苯丙乳液中分散性得到提高。当钛铬黄、铬绿掺量分别为20%、10%时，两种彩色涂层隔热性能达到最优，此时其太阳光反射比分别为0.633、0.484，红外发射率分别为0.91、0.90，平衡温度较空白试板分别降低6.6℃、4.8℃，同时兼具较好的力学性能及耐腐蚀性能。

Abstract:

Alkaline nano-silica sol was grafted and modified by KH560 and composite with styrene-acrylic emulsion to prepare film base material. Then, two kinds of color thermal insulation and energy saving coatings were prepared by adding rutile type titanium chromium yellow and corundum type chromium green color paste respectively. The energy saving performance and heat insulation mechanism of the composite coating were investigated under the conditions of different functional pigment types and dosage. The results show that the average particle size of silica sol is reduced from 987.3nm to 72.3nm, the absolute value of Zeta potential is increased by 29.7 eV, and the dispersion of silica sol in styrene-acrylic emulsion is improved. When the content of Ti-Cr yellow and Ti-Cr green were 20% and 10%, the thermal insulation performance of the two kinds of color coatings reached the best, the solar reflectance was 0.633 and 0.484, the infrared emissivity was 0.91 and 0.90, and the equilibrium temperature was 6.6℃ and 4.8℃ lower than that of the blank test plate, respectively. At the same time, the two kinds of color coatings had good mechanical properties and corrosion resistance.Key words: Mechanism of heat insulation ;Modified silica sol; Styrene-acrylic emulsion; Composite coating; Thermal insulation and energy saving coating; Reflective pigment