| Sound insulating materials plays an important role in environmental protection which usedfor the noise control. However, the sound insulation property of traditional sound insulatingmaterial is usually improved by increasing of material surface density. While, it is wellrecognized that heavy weight and large thickness sound insulating material is a challenging forits practical applications. Shear thickening fluid (STF) attracts much attention as a new type offunction materials and has already been used into bullet-proof and puncture-proof materials. So,it can be speculated that acoustic energy may be absorbed in shear thickening process due to thepresence of shear force in the sound waves incidence process, and the sound insulation effect ofthe material will be enhanced. Meanwhile, although the shear thickening effect of normal STFcan be enhanced by increasing of SiO2content in the system, the high content of SiO2will belead to the material difficult to process and high density of material.In order to further improve the sound insulation property of textile composites, it isproposed that the compounded shear thickening fluid is used for the textile treatment to improvethe sound insulation property of textile composites. Herein, a novel compounded shearthickening fluid is prepared, and its rheological property and shear thickening mechanism isdiscussed. And then, the compounded shear thickening fluid prepared under optimum conditionis used for the textile treatment. On this basis, the compounded shear thickening fluid modifiedsound insulating textile composites are prepared and its sound insulating property is evaluated.Meanwhile, the different laminated structures sound insulated textile composites are prepared byextrusion laminating technology. The effect of material structure and STF on sound insulationproperty of composites has been studied. Sound insulation property of textile composites can befurther improved by the treatment methods mentioned above.First, on the basis of SiO2nanoparticle used as the first dispersion phase, and proposes thelinear HNT and body-shaped TW-ZnO used as the second dispersion phase to prepare the twokinds of compounded shear thickening fluid systems named HNT-SiO2compounded STF and TW-ZnO/SiO2compounded STF,and then the shear thickening performance of compounded STFis investigated. The results show that the shear thickening performance can be significantlyenhanced by the addition of a little amount of second dispersion phase, the HNT-SiO2compounded STF with the ratio of SiO2/HNT is25/0.10shows the best thickening performance.Second, the two kinds of glass fiber cloth with different weaving structures is treated bycompounded STF for the preparation of STF-fabric composites. The morphology and soundinsulation property of STF-fabric composites is also studied. The results show that soundinsulation property of STF-fabric composites is improved by the STF treatment due to the shearthickening properties of the STF which can absorbing acoustic energy, and weaken the vibratoryaction. When the ratio of SiO2/HNT is25/0.10, the compounded STF treated fabric shows thebest sound insulation performance.Third, the sound insulation textile composites with different laminated structures areprepared by extrusion laminating technology. The effect of different laminated structures on thesound insulation performance composites is investigated. It is show that different compositestructure has the different sound insulation effect, and the split type sandwich structure has thebest sound insulation effect. On this basis, the STF-fabric based sound insulation textilecomposites with split type sandwich structure are prepared and its sound insulation performanceis studied. The results show that the STF-fabric based sound insulation textile composites has thebest sound insulation performance which compared to the untreated fabric based soundinsulation textile composites. |
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