Heat-generating composite material of graphene and bimetallic nanowires and preparation method thereof

Abstract

The invention discloses a heat-generating composite material of graphene and bimetallic nanowires and a preparation method thereof, wherein the heat-generating composite material includes preparationraw materials and a preparation method. The preparation raw materials comprise the following components: graphene oxide, copper nanowires, and silver, platinum, gold or palladium noble metal salts. The highly conductive nano component with stable structure is obtained by composting of the bimetallic nanowires and graphene oxide. At the same time, graphene oxide is easy to disperse in a polymer phase, a complicated and energy-consuming dispersion treatment means is avoided, the introduction of a dispersant is not needed, the preparation process is greatly simplified, the processing cost is low,and the heat-generating material can be produced in large quantities; the time of the prepared heat-generating material required to be heated to a stable value in a range of 10-220 V is less than 300s, and the stable temperature can be regulated in a range of 0-200 DEG C through voltage. The electrical conductivity of the prepared heat-generating composite material can be adjusted in a range of0.1-10 S / cm. The prepared heat-generating composite material is suitable for use as a warm-keeping material, also can be used as a temperature control material, and has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of graphene preparation, in particular to a heat-generating composite material of graphene and bimetallic nanowires and a preparation method thereof. Background technique [0002] Keeping warm is necessary for the human body to maintain normal function in low temperature and cold environment. The current thermal insulation materials are mainly metal-based heating materials, and the electricity-to-heat conversion is realized under a certain voltage through heating elements such as metal wires. It has a series of problems such as metal breakage, short circuit, and serious heat loss after heat dissipation. In recent years, the application of new nanomaterials, especially graphene nanomaterials, has gradually attracted the interest of related technology companies. [0003] Graphene, a two-dimensional crystal material composed of a single layer of carbon atoms, is the thinnest known material. It is called a mag...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent application CN 105380310A discloses a graphene far-infrared intelligent heating suit. The graphene film is encapsulated by a PVC insulating layer, but PVC is a thermoplastic polymer, and the combination with the graphene surface is not firm, and the graphene film is under the encapsulation condition. Repeated folding has the defect that the internal resistance is greatly increased due to breakage

However, the use of freeze-drying or supercritical drying technology combined with high-temperature thermal reduction technology leads to high costs, which is not conducive to low-cost mass production

[0009] In addition, although graphene synthesized by various methods has been mass-produced, it has many intrinsic defects, and its actual electrical conductivity and thermal conductivity have not reached ideal values, which are still lower than those of traditional metal materials such as copper.

Moreover, the interface resistance and thermal resistance of graphene in polymer materials are relatively high, which also seriously affects its performance in practical applications.