超疏水改性自发光水泥基材料的性能与微结构

Properties and Micro-structure of Super-hydrophobic Modified Self-luminous Cement-Based Materials

借鉴稀土长余辉发光材料吸光蓄光发光特性与超疏水材料自清洁特性,以水泥基胶凝材料为主体,制备出既可以在白天吸光夜间发光,也可以在雨季排水除尘的新型超疏水改性自发光水泥基功能材料.采用正交设计方法优选出综合性能最优的材料配比进行疏水改性,研究了该材料的力学性能、发光性能和疏水性能,并使用扫描电子显微镜(SEM)、原子力显微镜(AFM)和傅里叶红外光谱仪(FTIR)等对其表面微观形貌、表面粗糙度及有机物组成进行了表征.结果表明:最优的材料配比为30%发光粉、5%反光粉和0.44的水胶比;超疏水涂层材料对自发光试件的力学性能与发光性能没有影响;氟硅烷疏水剂处理试件的疏水性能比硅烷类疏水剂处理试件更优,接触角高达159.8°,表面能低至-19.11 mJ/m^2;自发光超疏水试件表面粗糙度较大,经过氟化处理后,SiO 2表面成功接入了氟链并形成低表面能的烷基链,随着反应的进行,烷基链不断延长并在基体表面形成大量的微纳米复合二级结构.

Based on the luminescent characteristics of long afterglow luminescent materials and self-cleaning properties of super-hydrophobic materials,cement-based cementitious materials were used as the main matrix to produce new super-hydrophobic modified self-luminous cement-based functional materials,which can not only absorb light during day and luminous at night,but also can be drained and dedusted in rainy season.Orthogonal design method was used to select the best material proportion with the best comprehensive performance,and then the hydrophobic modification was carried out.The mechanical properties,luminescent properties and hydrophobicity of the materials were studied by experiments,and the surface morphology,surface roughness and organic composition were characterized by scanning electron microscope(SEM),atomic force microscopy(AFM)and fourier transform in frared spectrometer(FTIR).The results show that the optimum material ratio is 30%luminescent powder,5%reflective powder and 0.44 water-binder ratio.The super-hydrophobic coating material has little effect on the mechanical properties and luminescent properties of self-luminescent specimens.Compared with the specimen treated with silane hydrophobic agent,the hydrophobicity of the specimen treated with fluorosilane hydrophobic agent is better than that of the specimen treated with silane/siloxane hydrophobic agent,its contact angle is 159.8°and surface energy is-19.11 mJ/m^2.The surface roughness of the self-luminescent and super-hydrophobic specimen is higher.After fluorination,the SiO 2 surface is successfully connected to the fluorine chain and formed an alkyl chain with low surface energy.The alkyl chain is extended and a large number of micro/nano composite secondary structures are formed on the substrate surface.