Preparation method of graphene for heater
A graphene and heater technology, applied in the field of graphene, can solve the problems of graphene's electrical conductivity and specific surface area reduction, graphene crystal structure defects, affecting applications, etc., to achieve large-scale production, good conductivity and specific surface area , The effect of controllable production process
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Embodiment 1
[0022] A kind of preparation method of heater graphene specifically comprises the following steps:
[0023] (1) Pre-oxidation of graphite: put concentrated sulfuric acid, potassium persulfate, and phosphorus pentoxide in the reactor, stir, add graphite powder after heating to 80°C, ultrasonically disperse for 25 minutes, keep warm for 4 hours, and cool to room temperature naturally , diluted, vacuum filtered, washed until neutral and then spray-dried to obtain pre-oxidized graphite powder;
[0024] (2) Oxidation of graphite:
[0025] A. Low-temperature reaction: Pour concentrated sulfuric acid into the reactor, turn on the mechanical stirring, cool in an ice bath to below 2°C, add pre-oxidized graphite powder and nitrate, slowly add potassium permanganate after 1 hour, and then use Ultrasonic and maintain mechanical stirring, while introducing oxygen into the reaction system, control the temperature at 4°C, 8°C, and 13°C for 1 hour each;
[0026] B. Medium-temperature reacti...
Embodiment 2
[0033] A kind of preparation method of heater graphene specifically comprises the following steps:
[0034] (1) Pre-oxidation of graphite: put concentrated sulfuric acid, potassium persulfate, and phosphorus pentoxide in a reactor, stir, add graphite powder after heating to 80°C, ultrasonically disperse for 20 minutes, keep warm for 5 hours, and cool naturally to room temperature , diluted, vacuum filtered, washed until neutral and then spray-dried to obtain pre-oxidized graphite powder;
[0035] (2) Oxidation of graphite:
[0036] A. Low-temperature reaction: Pour concentrated sulfuric acid into the reactor, turn on the mechanical stirring, cool in an ice bath to below 2°C, add pre-oxidized graphite powder and nitrate, slowly add potassium permanganate after 1 hour, and then use Ultrasonic and maintain mechanical stirring, while introducing oxygen into the reaction system, control the temperature at 4°C, 8°C, and 13°C for 1 hour each;
[0037] B. Medium-temperature reaction...
Embodiment 3
[0044] A kind of preparation method of heater graphene specifically comprises the following steps:
[0045] (1) Pre-oxidation of graphite: put concentrated sulfuric acid, potassium persulfate, and phosphorus pentoxide in the reactor, stir, add graphite powder after heating to 80°C, ultrasonically disperse for 22 minutes, keep warm for 5 hours, and cool to room temperature naturally , diluted, vacuum filtered, washed until neutral and then spray-dried to obtain pre-oxidized graphite powder;
[0046] (2) Oxidation of graphite:
[0047]A. Low-temperature reaction: Pour concentrated sulfuric acid into the reactor, turn on the mechanical stirring, cool in an ice bath to below 2°C, add pre-oxidized graphite powder and nitrate, slowly add potassium permanganate after 1 hour, and then use Ultrasonic and maintain mechanical stirring, while introducing oxygen into the reaction system, control the temperature at 4°C, 8°C, and 13°C for 1 hour each;
[0048] B. Medium-temperature reactio...
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