关键词: 复合材料, 剪切增稠, 流变学, 芳纶, 聚氨酯

Abstract: In view of the deficiency of the existing materials with impact resistance, this paper adopts the method of shear pressure of double-roll mill to impregnate the aramid fiber cloth with non-Newtonian fluid, and binds it closely with polyurethane matrix through curing reaction to prepare a new type of aramid fiber cloth reinforced non-Newtonian fluid matrix composite. The dispersion effect of particles in the medium was characterized by nano-particle size analyzer and potential analysis, and the viscosity of non-Newtonian fluid with shear frequency was measured by rheometer. When the amount of dispersed particles reaches 30wt%, an obvious shear thickening process can be observed, and the viscosity can reach three times of the initial viscosity. It is found that the initial viscosity of shear thickening fluid is positively correlated with the maximum viscosity after thickening. The results of impregnation rate test and scanning electron microscope (SEM) showed that the fiber and shear thickening fluid could be effectively bonded at a mass ratio of 1∶1 under the process of impregnation roller. To assess aramid fiber cloth reinforced non-Newtonian fluid shock resistance of composite materials, the scene simulation working condition of power cable laying, use commonly used in the construction process of cutting equipment for the preparation of polypropylene-shear thickening fluid impact test in situ impregnated aramid sandwich plate, the results show that the new type of non Newtonian fluid matrix composites have excellent shock resistance, it can meet the requirements of impact resistance of materials under complex working conditions.

Key words: composite materials, shear thickening, rheology, aromatic polyamide fiber, polyurethane