高强疏水硅酸钠保温材料的制备

发布时间：2018-01-27 04:38

本文关键词： 保温材料硅酸钠机械强度疏水　出处：《无机盐工业》2017年12期 　论文类型：期刊论文

【摘要】：以硅酸钠水溶液为主要原料,无水碳酸钠和疏水剂为添加剂,制备高强疏水发泡材料。通过热重-差式扫描量热分析(TG-DSC)判断硅酸钠水溶液的质量损失和吸热温度,结合实验数据确定发泡温度。无水碳酸钠的加入改变了混合溶液的黏度,从而改善了发泡材料的机械强度,在碳酸钠用量为4%(质量分数)时,材料的抗压强度由0.45 MPa提高到1.94 MPa,抗折强度由0.12 MPa提高到1.52 MPa。有机硅憎水剂的加入改变了发泡材料的表面性能,提高了发泡材料的疏水性,材料的吸水率由50.6%降低到5%,接触角由0°提高到140°,发泡材料由亲水性变为疏水性。
[Abstract]:Sodium silicate aqueous solution was used as the main raw material and anhydrous sodium carbonate and hydrophobic agent as additives. High strength hydrophobic foaming materials were prepared. The mass loss and endothermic temperature of sodium silicate aqueous solution were determined by TG-DSC-TG-DSC-TG-DSC-TG-DSC-TG-DSC-TG-DSC-DSC-TG-DSC@@. The addition of anhydrous sodium carbonate changed the viscosity of the mixed solution, thus improving the mechanical strength of the foamed material, when the amount of sodium carbonate was 4 (mass fraction). The compressive strength of the material was increased from 0. 45 MPa to 1. 94 MPa. The flexural strength was increased from 0. 12 MPa to 1. 52 MPA. The addition of silicone hydrophobic agent changed the surface properties of the foamed materials and improved the hydrophobicity of the foamed materials. The water absorption of the material was reduced from 50.6% to 5, the contact angle was increased from 0 掳to 140 掳, and the hydrophilicity of foamed materials was changed from hydrophilicity to hydrophobicity.
【作者单位】：南京工业大学材料科学与工程学院;
【分类号】：TQ177.4
【正文快照】： 随着经济的发展,房屋建筑规模逐年增大,建筑能耗也越来越大,采用建筑保温材料是降低建筑能耗的有效方法之一。有机保温材料存在有毒且易燃等缺点,使得无机保温材料得到了广泛研究[1]。目前市场上常用的无机保温材料有岩棉、玻璃棉、膨胀珍珠岩板、泡沫玻璃、发泡水泥和发泡混

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