涂层结构对建筑节能涂层性能的影响

目的通过探究建筑节能涂层的最佳涂层结构,进而提升涂层的隔热和耐久性能。方法将含空心微珠和二氧化钛的涂层作底漆,硅溶胶-苯丙复合涂层作面漆,探究不同种类底漆和面漆对铬绿建筑节能涂层性能的影响。采用正交试验寻求最佳底漆和面漆组合方案,对最佳组合方案涂层进行了综合性能测试,并探讨了相关机理。结果在不改变涂层颜色外观的情况下,底漆可增加涂层的太阳光反射比,面漆可增大涂层的静态接触角,增强涂层的耐水性、耐沾污性和耐老化性,降低涂层污染后和人工气候老化后太阳光反射比变化率及色差。最佳涂层结构组合方案为:底漆中空心微珠和二氧化钛掺量均为5%,面漆中苯丙乳液和硅溶胶质量比为14∶1。此时涂层的太阳光反射比和隔热温差分别为0.6455和6.9℃,且综合性能均较好,具有一定的应用价值。结论涂层结构对建筑节能涂层的隔热和耐久性能具有一定的影响,实际应用时可根据需要改变涂层结构来获得满意的性能。

Effects of Coating Structure on Properties of Building Energy-saving Coatings

The work aims to improve thermal insulation and durability of coating by investigating optimal coating structure of building energy-saving coating. With a coating containing hollow glass micro-bead and titanium dioxide as base coat, and si-lica sol-styrene-acrylic composite emulsion as finishing coat, effects of different base coats and finishing coats on properties of building energy-saving coatings were investigated. Optimal combination scheme of base coat and finishing coat were obtained in method of orthogonal experiment. Comprehensive performance test was performed to the optimal combining scheme coating. What's more, relevant mechanism was disscussed. Provided that color appearance of the coatings remained the same, the base coat could improve solar reflectance of the coating while the finishing coat could increase static contact angle, water resistance, stain resistance and ageing resistance of the coating, and reduced change rate of solar reflectance and chromatic aberration of the coating after pollution and artificial ageing treatment. Optimal combination scheme of coating was, hollow glass micro-bead and titanium dioxide in base coat as 5%, and mass ratio between styrene-acrylic emulsion/silica sol as 14:1 in finishing coat. The solar reflectance and insulation temperature difference was 0.6455 and 6.9 ℃ , respectively. The coating was of good overall performance and certain application value. Coating structure has certain effects on thermal insulation and durability of building energy-saving coating. Satisfactory performance can be obtained by changing coating structure during practical application.