Graphene-based PTC ink, electrothermal device and preparation method of graphene-based PTC ink
A graphene-based, graphene-based technology, applied in the direction of electric heating devices, inks, ohmic resistance heating, etc., can solve the problems of not being environmentally friendly, complicated preparation methods of graphene-based PTC inks, etc., and achieve the effect of simple preparation process
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[0068] In another embodiment, the application provides a method for preparing the graphene-based PTC ink as described in the first aspect, characterized in that it comprises the following steps:
[0069] a) mixing graphene, dispersant and water, and dispersing into a graphene / water dispersion with a graphene content of 0.01-0.1wt% by high-speed shearing;
[0070] b) Add conductive additives and temperature-sensitive additives to the graphene / water dispersion obtained in step a), and disperse into low-concentration conductive dispersions by high-speed shearing;
[0071] c) raising the solid content of the low-concentration conductive dispersion obtained in step b) to a high-concentration conductive dispersion of 5-10 wt% by filtering;
[0072] d) uniformly mixing the high-concentration conductive dispersion obtained in step c) with resin and other additives to obtain the PTC ink.
[0073] In this embodiment, the purpose of steps a) and b) is to uniformly disperse the various m...
Embodiment 1
[0083] Take 10g of graphene powder, 10g of polyvinylpyrrolidone, and 100kg of water, and disperse at high speed in a high-speed shear reactor for 1 hour, with a cylinder volume of 300L and a rotating speed of 1200rpm, to obtain a graphene / water dispersion with a graphene content of 0.01wt%. liquid. Add 100 g of conductive carbon black and 0.1 g of barium titanate, and continue high-speed shear dispersion for 1 hour to obtain a low-concentration conductive dispersion.
[0084] Use a three-legged centrifuge with an 800-mesh filter bag, centrifuge at 200 rpm, stop centrifuging when the collected filtrate reaches 99 kg, and obtain a high-concentration conductive dispersion. The calculated solid content is about 10 wt%.
[0085] Take 100 g of the above-mentioned high-concentration conductive dispersion, add 20 g of acrylic resin emulsion with a solid content of 50%, 0.1 ml of a thickener, and 1 drop of a defoamer, stir and mix evenly to obtain the PTC ink.
[0086] Take 10ml of th...
Embodiment 2
[0089] Take 100g of graphene powder, 20g of polyvinyl alcohol, and 100kg of water, and disperse at high speed in a high-speed shear reactor for 1 hour, with a cylinder volume of 300L and a rotating speed of 1200rpm, to obtain a graphene / water dispersion with a graphene content of 0.1wt%. liquid. Add 100 g of graphite powder and 5 g of magnesium hydroxide, and continue high-speed shear dispersion for 1 hour to obtain a low-concentration conductive dispersion.
[0090]Using a three-legged centrifuge with 800 mesh filter bags, centrifuge at 200rpm, when the filtrate to be collected reaches 98kg, the calculated solid content is about 10wt%. Slowly add 2kg of water for rinsing, and stop centrifugation when 2kg of filtrate is obtained again to obtain a high-concentration conductive dispersion.
[0091] Take 100 g of the above-mentioned high-concentration conductive dispersion, add 20 g of polyurethane emulsion with a solid content of 50%, 0.1 ml of thickener, and 1 drop of defoamer...
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