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

Abstract

Abstract: 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.

Key words: calcium silicate hydrate polyurethane nanocomposites, hydrothermal synthesis, calcium silicon ratio, micro nano structure, crystallinity

CLC Number:

TU528

YUAN Qi, HE Xiaofang, ZHANG Lihong, CAO Xinxin, FAN Shuaipeng. Structure Analysis of Calcium Silicate Hydrate Polyurethane Nanocomposites Prepared by Hydrothermal Synthesis[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3565-3571.

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