N-异丙基丙烯酰胺基智能膨润土制备及其性能

Preparation and properties of N-isopropylacrylamide-based smart bentonite

摘要:

以钠基膨润土为原料，通过硅烷偶联剂KH570的脱水缩合作用将N-异丙基丙烯酰胺（NIPAM）接枝在钠基膨润土表面，制备智能温敏膨润土（NIPAM-B）。采用单因素方法对NIPAM-B的合成指标进行优化，并利用XRD、FTIR技术对NIPAM-B进行表征，同时对NIPAM-B的温敏性、NIPAM-B悬浮液的流变性和悬浮性进行考察，并引入丙烯酸（AA）单体实现温度调控。结果表明，NIPAM-B具有良好的温敏特性，且该智能温敏膨润土悬浮液的流变性在40~60℃范围内表现出稳流特点以及升温增稠的特性。但该智能温敏膨润土相较于膨润土原土而言，悬浮性略有下降。此外，经过引入AA的温度调控作用，发现AA与NIPAM的添加量的物质的量比值每增加10%，智能温敏膨润土的LCST将提高10℃左右。

Abstract:

Using sodium bentonite as raw material, N-isopropyl acrylamide (NIPAM) is grafted on the surface of sodium bentonite through the dehydration condensation of silane coupling agent KH570 to prepare intelligent temperature-sensitive bentonite (NIPAM-B). The single-factor method was used to optimize the synthesis index of NIPAM-B, and XRD and FTIR technology were used to characterize NIPAM-B. At the same time, the temperature sensitivity of NIPAM-B and the rheology and suspension of NIPAM-B suspension were investigated. , And introduce acrylic acid (AA) monomer to realize temperature control. The results show that NIPAM-B has good temperature-sensitive characteristics, and the rheological properties of the intelligent temperature-sensitive bentonite suspension show steady flow characteristics and heating and thickening characteristics in the range of 40-60℃. However, the suspensibility of this smart temperature-sensitive bentonite is slightly lower than that of the original bentonite. In addition, after introducing the temperature control effect of AA, it is found that for every 10% increase in the ratio of the added amount of AA to NIPAM, the LCST of the smart temperature-sensitive bentonite will increase by about 10°C.