Method for preparing NiTi spring/carbon nano-tube/polyurethane composite material

Abstract

The present invention provides a method for preparing a NiTi spring / carbon nano-tube / polyurethane composite material. The method comprises: (1) respectively dissolving carbon nano-tubes and polyurethane elastomer particles in an organic solvent, and adding the carbon nano-tube solution to the polyurethane elastomer solution in a dropwise manner, wherein the carbon nano-tube content is 0.1-1 wt%; (2) placing the mixed solution obtained in the step (1) in a vacuum drying oven to exhaust gas, wherein the temperature is maintained at 70-100 DEG C, and the time is 0.5-1.5 h; (3) placing a NiTi alloy spring into acetone, and carrying out ultrasonic cleaning; (4) slowly embedding the NiTi alloy spring into the mixed system obtained in the step (2); and (5) removing the solvent in an air blasting constant temperature oven, wherein the temperature is maintained at 70-100 DEG C, the molding time is 24-48 h, and the product is obtained after the solvent is completely removed. According to the present invention, the method has characteristics of simple preparation process, good moldability and low cost; and the prepared composite material exhibits good damping property and good shape memory recovery property.

Description

Technical field [0001] The invention relates to a method for preparing composite functional materials, in particular to an improved method for preparing NiTi spring / carbon nanotube / polyurethane composite material. Background technique [0002] The harm of vibration and noise is huge. It not only destroys the reliability and stability of the operation of mechanical equipment, but also pollutes the environment and endangers human health. Facts have proved that the use of damping materials is the most effective way to control structural resonance and noise. The research on the damping behavior of materials and the development of damping materials with higher damping performance have very important practical significance for reducing and solving the hazards and problems caused by vibration. A single damping material often cannot fully meet the requirements of engineering applications. For example, although high polymer has a high damping loss factor, it cannot be used as a structur...

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Problems solved by technology

However, it was found in the research that when the composite material is prepared by the hot-melt method, due to the poor overall fluidity of the resin matrix, the carbon nanotubes can only be effectively dispersed locally, and the overall dispersion effect is not good.

In addition, because different molds need to be prepared in advance when preparing materials of different shapes, thus increasing the production cost

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