改性水玻璃的红外光谱分析

Infrared Spectroscopy Analysis of Modified Sodium Silicate

用改性树脂对水玻璃进行改性,为了解改性后水玻璃的分子结构会产生什么变化,硬化前、后普通和改性水玻璃有什么区别,从而对改性水玻璃的改性机理和硬化机理进行研究,对硬化前、后的普通水玻璃和改性水玻璃进行红外光谱(IR)分析。红外光谱分析表明:改性水玻璃的分子结构中都或多或少地含有改性树脂的极性基团。改性树脂的加入使红外吸收光谱中氢键的吸收峰增强,证实改性树脂中的极性化合物借氢键吸附在水玻璃凝胶胶粒的表面,形成高分子保护层,限制凝胶胶粒的长大,从而获得细小的水玻璃凝胶胶粒,达到提高粘结强度的目的。红外光谱分析还证实:无论是改性水玻璃,还是普通水玻璃,吹CO2硬化时的硬化机理均包括物理脱水和化学反应两部分。

Modified resin was used to modify the sodium silicate. To understand the changes of the molecular structures of the sodium silicate after modified, and the differences between traditional and modified sodium silicate before and after hardening, a further study was made on the modification mechanism and hardening mechanism of sodium silicate by infrared spectrum analysis. Results demonstrate that in all of the molecular structures of modified sodium silicate exist more or less polarized groups of the modified resin. The hydrogen bonds formed between the carbonyl group of modified resin and the silanol group of sodium silicate, which resulted in the formation of a protect layer on the grain surface, so as to inhibit the grain growth, and the small sodium silicate gel particles was gained with greater bonding strength. Infrared spectral analysis also confirmed that the CO2-curing mechanism of both the modified and traditional sodium silicate includes the chemical curing reaction and physical curing reaction.