Polyurethane composite material doped by nickel-titanium memory alloy and carbon nanotube and preparation method thereof

Abstract

The invention provides a polyurethane composite material doped by a nickel-titanium memory alloy and carbon nanotube, and a preparation method thereof. The preparation method comprises the following steps: (1) winding NiTi alloy wires around a spring winding machine to form a spring structure; (2) subjecting the obtained spring to a thermal treatment with a temperature of 400 to 500 DEG C; (3) mechanically stirring and mixing carbon nanotubes and polyurethane elastomer particles; (4) painting a demoulding agent on the inner surface of a mould; (5) placing the mixture obtained in the step (3) into the mould, melting the mixture at a temperature of 190 to 220 DEG C, and moulding; (6) evenly placing the NiTi alloy springs on the layer prepared in the step (5), then dispersing the mixture of carbon nanotubes and polyurethane elastomer around the NiTi springs until the springs are totally covered; (7) finally carrying out composite material melting and moulding in an air blast constant temperature oven. The prepared material is a damping intelligent composite material having a shape memory effect, is capable of adapting to the environmental and temperature changes, and can be applied to the vibration damping field.

Description

technical field [0001] The invention relates to a preparation method of a polyurethane-based composite material, in particular to a nickel-titanium memory alloy and carbon nanotube composite doped polyurethane composite material and its preparation method. Background technique [0002] One of the most direct and effective ways to control vibration and noise is to use damping materials to convert the mechanical energy generated by vibration into heat energy and dissipate it, so as to achieve the purpose of vibration reduction and noise reduction. Viscoelastic damping materials are currently the most widely studied high-damping materials. Viscoelastic damping materials are mainly polymer materials such as polymers, which have light specific gravity, are easy to process, and can produce large damping. However, viscoelastic damping materials cannot be used as structural materials due to low stiffness, strength, and poor creep resistance. Nanomaterials such as carbon nanotubes ...

AI Technical Summary

Problems solved by technology

The currently published literature mainly involves the single addition of carbon nanotubes or NiTi alloy wires in viscoelastic resin materials. The impact resistance and mechanical properties of resin composite materials have not fully considered the temperature adaptation characteristics of resin-based composite materials and how to make a good combination of intelligent properties and damping characteristics of composite materials.

Moreover, in the past, the solution mixing method was mainly used in the preparation of composite materials, that is, the resin matrix was dissolved with an organic solvent and then compounded with the filler material, and finally the solvent was volatilized before molding. This method has the advantages of low preparation efficiency, high cost, Disadvantages such as the solvent is difficult to completely volatilize and remove

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