Preparation method of graphene/carbon nano tube disperse system high-polymer based composite material
A technology of polymer materials and carbon nanotubes, which is applied in the field of preparation of graphene/carbon nanotube dispersion system polymer-based composite materials, can solve performance degradation, limited binding force and aging, carbon nanotube structure and performance damage, etc. problem, to achieve the effect of good dispersion and excellent conductivity
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Embodiment 1
[0034] Add multi-walled carbon nanotubes with a diameter of 10 to 30 mm and a length of 1 to 100 μm and bag-type graphene with 1 to 6 layers and a diameter of 200 to 300 nm into acetone at a mass ratio of 1:4, and the solid-to-liquid mass ratio is 1: 49. Use a high-speed disperser with a stainless steel pulverizer to shear and disperse for 60 minutes at a speed of 8000r / min, and then use an ultrasonic disperser with a frequency of 40KHz, a power of 100W, and a volume of 3L for 30 minutes.
[0035] Weigh 50 g of the obtained mixture and add it to a mixture of 80 g of E51 epoxy resin prepolymer and 20 g of phenalkamine curing agent T31, and heat to 50° C. for 20 minutes. The volume resistivity of the obtained G / NT / P composite is 2.3×10 3 Ω·cm, the tensile strength is 71.3MPa, and the bending strength is 142.4MPa. For the mixture of 80g of E51 epoxy resin prepolymer and 20g of phenalkamine curing agent, the volume resistivity of the epoxy resin material prepared by the same curi...
Embodiment 2
[0037] Add multi-walled carbon nanotubes with a diameter of 20 to 40 mm and a length of 40 to 400 μm and 1 to 10 layers of graphene microflakes with a diameter of 400 to 600 nm in absolute ethanol at a mass ratio of 1:1, and the solid-to-liquid mass ratio is 1:99, use a high-speed disperser with a stainless steel pulverizer to shear and disperse at a speed of 1200r / min for 30min, and then use an ultrasonic disperser with a frequency of 40KHz, a power of 100W, and a volume of 3L for 45min.
[0038] Weigh 8000g of the obtained mixture, dry it in vacuum at 80°C for 6 hours, mix the obtained powder with 7.85kg of PC pellets, 15g of plasticizer zinc stearate, and 15g of antioxidant 2921 in a high-speed mixer, and the obtained mixture Mixing and granulation is carried out on an extrusion granulator, and the mixed particles are injection-molded on the extruder at 310° C. to obtain a G / NT / P composite material. The surface resistivity of the composite material is 1.4×10 4 Ω cm, tensil...
Embodiment 3
[0040] Add single-walled carbon nanotubes with a diameter of 80%) and a diameter of 0.5 to 2 μm into anhydrous In ethanol, add 1 g of the above mixed powder into 200 g of absolute ethanol, add 1.5 g of KH570, and use a stainless steel pulverizer high-speed disperser to shear and disperse at a speed of 1200 r / min for 30 min. A 3L ultrasonic disperser ultrasonically disperses for 30 minutes. The mixed liquid was vacuum-dried at 80° C. for 6 hours to obtain surface-grafted functionalized carbon nanotubes and graphene powder.
[0041] Weigh 15g of the obtained powder, add to 99.7g of MMA monomer and 0.2g of initiator BPO, pre-polymerize at 85°C for 60min, vacuum defoam for 30min, inject into the molding mold, and polymerize at 45°C for 40h. G / NT / P composites based on PMMA were obtained by in-situ polymerization.
[0042] The surface resistivity of the G / NT / P composite is 2.2×10 3 Ω·cm. For the same PMMA monomer, without graphene / carbon nanotube composite powder, the surface re...
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