基于MOF-801的高性能剪切增稠液的制备及防护性能研究

Study on Preparation and Protection Performance of MOF-801 Based High Performance Shear Thickening Fluid

航空服作为保护飞行员安全的重要个人防护设备,一直在不断改进和升级。如何在保证飞行员生命健康的前提下,实现航空服穿戴舒适化和轻质化,一直都是一个亟须解决的问题。剪切增稠液是一种新型智能材料,其具有独特的非牛顿流体特性,可有效吸收外来冲击从而实现缓冲效果。然而,现有研究中剪切增稠液体系亟待进一步优化,传统二氧化硅基剪切增稠效应也需要提高。基于此,本文以氯化氧锆为次级构筑单元,富马酸为侨联配体,得到具有高度结晶度和良好热稳定性的MOF-801纳米颗粒。将其与乙二醇溶液通过球磨法制备得到剪切增稠液。该产品表现出优异的剪切增稠性能,在相同质量分数下其性能优于传统二氧化硅基的剪切增稠液。同时,利用激波发生装置,研究发现剪切增稠液在超高速激波作用下,同样表现出由液体向固体的转变。最后,通过稀释后抽滤方法,将剪切增稠液与天然皮革紧密复合,所得复合结构表现出良好的能量耗散特性和缓冲减震特点。MOF-801基剪切增稠液不仅具有优异的剪切增稠性能,也为新一代防护服的仿生轻质化设计提供了新的方向。

As an important personal protective equipment to protect the safety of pilots,aviation suits have been constantly improved and upgraded.However,the simultaneous realization of the comfort and light weight of aviation suits while ensuring the health and safety of pilots has always been a pressing issue to be solved.As a new type of intelligent material,shear thickening fluid has unique non-newtonian fluid properties that can effectively absorb external impacts and achieve cushioning effect.However,the shear thickening fluid system in existing studies needs to be optimized and the shear-thickening effect of the traditional silica-based STF also needs to be improved.In this paper,MOF-801 nanoparticles with high crystallinity and good thermal stability were prepared by using zirconium oxychloride as a secondary building block and fumaric acid as an overseas ligand.The shear thickening fluid was prepared by ball milling with ethylene glycol solution,and the final product exhibited excellent shear thickening performance,which is much better than the traditional silica-based shear thickening fluid with the same mass fraction.At the same time,in combination with the faculty shock wave generation device,it was observed that the shearthickening fluid exhibited the same transition from liquid to solid under the action of ultra-high speed shock waves.Finally,the shear thickening solution was closely compounded with natural leather by dilution-filtration method.The composite structure exhibits good energy dissipation characteristics as well as cushioning and vibration damping effects.The MOF-801-based shear thickening fluid prepared in this paper not only has excellent shear thickening performance,but also provides a new direction for the design of a new generation of lightweight protective aviation suits.