Dong Zhuo, Zhang Lei, Yang Ke, Fang Zhenggang, Ni Yaru, Li Yang, Lu Chunhua
State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, China.
Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, China.
Materials (Basel). 2024 Sep 15;17(18):4542. doi: 10.3390/ma17184542.
High-temperature adhesives find extensive application in diverse domains, encompassing repairs, production processes, and material joining. However, achieving their curing at ambient temperatures remains a formidable challenge due to the inherent requirement of elevated temperatures, typically exceeding 500 °C, for the curing reaction. To overcome this limitation, in this study, we developed a distinctive inorganic phosphate-based composite adhesive by incorporating dual-functional calcium monoaluminate (CA) into a traditional adhesive blend comprising Al(HPO) and MgO. This distinctive approach significantly diminishes the curing temperature, enabling it to occur at room temperature. Firstly, CA's facile hydration reaction effectively scavenges surrounding water molecules, thereby accelerating the dehydration curing process of Al(HPO). Secondly, as hydration is an exothermic process, it locally generates heat around the Al(HPO), fostering optimal conditions for its curing reaction. Moreover, the adhesive's strength is substantially bolstered through the strategic inclusion of Nano-AlO (enhancing the availability of reaction sites) and Nano-SiO (improving overall stability). As a demonstration, the adhesive formulation with added CA containing 2% Nano-AlO and 2% Nano-SiO achieved a remarkable tensile strength of 32.48 MPa at room temperature, underscoring its potential as an efficient solution for various practical adhesive applications. The adhesive prepared in this study harnesses the hydration properties of CA to absorb moisture and release substantial heat, introducing a novel method for ambient temperature curing. This development promises to broaden its applications in refractory materials, coatings, and equipment repair.
高温胶粘剂在包括修复、生产工艺和材料连接在内的各种领域都有广泛应用。然而，由于固化反应通常需要超过500℃的高温，在环境温度下实现其固化仍然是一项艰巨的挑战。为了克服这一限制，在本研究中，我们通过将双功能铝酸一钙（CA）加入到由Al（HPO）和MgO组成的传统胶粘剂混合物中，开发了一种独特的无机磷酸盐基复合胶粘剂。这种独特的方法显著降低了固化温度，使其能够在室温下发生。首先，CA的易水化反应有效地清除周围的水分子，从而加速Al（HPO）的脱水固化过程。其次，由于水化是一个放热过程，它在Al（HPO）周围局部产生热量，为其固化反应创造了最佳条件。此外，通过战略性地加入纳米AlO（增加反应位点的可用性）和纳米SiO（提高整体稳定性），胶粘剂的强度得到了显著增强。作为一个示范，添加了含有2%纳米AlO和2%纳米SiO的CA的胶粘剂配方在室温下实现了32.48MPa的显著拉伸强度，突出了其作为各种实际胶粘剂应用的有效解决方案的潜力。本研究制备的胶粘剂利用CA的水化特性吸收水分并释放大量热量，引入了一种环境温度固化的新方法。这一进展有望拓宽其在耐火材料、涂料和设备维修中的应用。
