水热合成制备水化硅酸钙-聚氨酯纳米复合材料的结构分析

本文以生石灰、纳米二氧化硅和聚氨酯为原料,采用水热合成法制备了纯水化硅酸钙和水化硅酸钙-聚氨酯纳米复合材料,并利用扫描电子显微镜、能谱仪、X射线衍射仪、红外光谱仪和热分析仪对其进行表征测试。结果表明:水化硅酸钙和水化硅酸钙-聚氨酯复合材料的微观组织形貌具有明显差异,随着钙硅摩尔比的增大,出现了Tobermorite相,且随着聚氨酯的加入,该相的结晶度增强;聚氨酯可以嵌入水化硅酸钙层间,使其基底层间间距增大1.038 nm;聚氨酯的加入可以提高水化硅酸钙的热稳定性,且对钙硅比较高的水化硅酸钙改性更有效。

Structure Analysis of Calcium Silicate Hydrate Polyurethane Nanocomposites Prepared by Hydrothermal Synthesis

In this paper, pure calcium silicate hydrate and calcium silicate hydrate polyurethane nanocomposites were synthesized by hydrothermal method using quicklime, nano silica and polyurethane as raw materials, and characterized by scanning electron microscope, energy dispersive spectrometer, X-ray diffraction, Fourier transform infrared spectroscopy and thermogravimetric analysis. The results show that there are obvious differences in microstructure between calcium silicate hydrate and calcium silicate hydrate polyurethane nanocomposites. With the increase of Ca/Si mole ratio, the tobermorite is discovered in the analysis results, and the crystallinity of this phase increases with the addition of polyurethane. Polyurethane can be embedded in the calcium silicate layer, and the distance between the base layers increases by 1.038 nm. The addition of polyurethane improves the thermal stability of calcium silicate hydrate, and the modification of calcium silicate hydrate with a high calcium silicon ratio is more effective.