A preparation method of silicon carbide nanowire-carbon nanotube flexible composite heating film
A technology of silicon carbide nanowires and carbon nanotubes is applied in electric heating devices, ohmic resistance heating, heating element materials, etc., to achieve the effects of good heating stability, simple preparation process and good flexibility
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Embodiment 1
[0029] Step a: Put the carbon nanotube raw material into a round-bottomed flask, add sulfuric acid and nitric acid to mix evenly, put it in an oil bath at 120° C. for reflux for 8 hours, remove impurities in the carbon nanotubes and modify them. The mass ratio of carbon nanotubes, sulfuric acid, and nitric acid is 0.1:3:1. Pour the refluxed carbon tube solution into deionized water, remove the acid in the solution by repeated suction filtration, and complete the suction filtration when the pH of the filtrate is 7. The carbon nanotubes after suction filtration were dissolved in N,N-dimethylformamide, prepared into a carbon nanotube dispersion with a mass fraction of 5%, and then sieved with a 60-mesh copper mesh filter to refine the agglomerated For carbon nanotubes, put the sieved carbon nanotubes into an oven at 80° C. for drying. After drying, use a quartz mortar to grind them sufficiently for later use.
[0030] Step b: dissolving the pretreated carbon nanotubes in ethanol...
Embodiment 2
[0041] Step a is the same as in Example 1.
[0042] Step b: dissolving silicon carbide nanowires in a dispersion medium composed of ethanol and ethylene glycol, and adding γ-glycidyl etheroxypropyl trimethoxysilane dropwise as a dispersant to modify the silicon carbide nanowires, wherein ethanol , Ethylene glycol, γ-glycidyl etheroxypropyl trimethoxysilane volume ratio is 1:3:0.1. The mass ratio of silicon carbide nanowires to the entire dispersion system is 1:10. Use a magnetic stirrer to stir for 4 hours, and then use a 60-mesh copper mesh filter to sieve the silicon carbide nanowires that are finely agglomerated. Dry it in an oven at 80°C, grind it thoroughly with a quartz mortar and set it aside.
[0043] Step c: mix the pretreated carbon nanotubes and silicon carbide nanowires in a mass ratio of 1:1 and dissolve them in ethanol to prepare a carbon nanotube / silicon carbide nanowire dispersion with a mass fraction of 5%, and then put Into an ultrasonic machine for ultras...
Embodiment 3
[0049] Step a, b are identical with embodiment 2.
[0050] Step c: mix the pretreated carbon nanotubes and silicon carbide nanowires in a mass ratio of 1:1.5 and dissolve them in ethanol to prepare a carbon nanotube / silicon carbide nanowire dispersion with a mass fraction of 5%, and then put Into an ultrasonic machine for ultrasonic treatment for 1 hour to obtain a uniformly dispersed carbon nanotube / silicon carbide nanowire dispersion for subsequent use;
[0051] Step d: Paste copper wires on both ends of the cut polypropylene film, apply the dispersion prepared in step c evenly on the film and copper wires, and then dry them, and then continue to repeat the coating and drying work until coating Complete, fully dried and packaged to obtain the desired flexible composite heating film.
[0052] Test Results:
[0053] figure 1 and image 3 The chromatogram analysis is identical with embodiment 2.
[0054] from Figure 4 It can be seen from the pressure-temperature curve th...
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