Expansible graphite with low thermal weight loss and high purity and preparation method thereof
An expanded graphite, high-purity technology, applied in the field of polymer functional material preparation, can solve the problems of increased thermal weight loss of sealed products, and achieve the effects of rapid heat energy, wide applicable temperature range, and high thermal conductivity
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Embodiment 1
[0019] Example 1: Put the expandable graphite in the drying tank, the temperature of the drying tank is controlled at 25°C, so that each grain of graphite is heated evenly, when the moisture content of the expandable graphite drops to 0.5-1%, according to the graphite mass 0.4% uniform spray mass percentage concentration of 54% sodium phosphate solution, after the sodium phosphate solution is evenly distributed on the graphite particles, continue to stir, then 0.2% of the graphite mass, 54% mass percentage concentration of sodium molybdate solution sprayed on the On the graphite particles, stir evenly, and the speed of rotating and stirring should not damage the graphite flakes. After the stirring is completed, store it in plastic mulch for 12-16 hours. Keep it closed as much as possible during storage. After storage, you can get low thermal weight loss and high purity expandable graphite. .
[0020] The obtained expandable graphite contains 99.5% carbon; 0.36% phosphorus; 0.0...
Embodiment 2
[0021] Example 2: Put the expandable graphite in the drying tank, the temperature of the drying tank is controlled at 30°C, so that each particle of graphite is heated evenly, when the moisture content of the expandable graphite drops to 0.5--1%, according to the graphite mass 0.8% of the mass percentage concentration of 0.8% of the graphite mass is evenly sprayed with a concentration of 52% sodium phosphate solution. After the sodium phosphate solution is evenly distributed on the graphite particles, continue to stir, and then the mass percentage concentration of 0.4% of the graphite mass is 50%. The sodium molybdate solution is sprayed on the On the graphite particles, stir evenly, and the speed of rotating and stirring should not damage the graphite flakes. After the stirring is completed, store it in plastic mulch for 12-16 hours. Keep it closed as much as possible during storage. After storage, you can get low thermal weight loss and high purity expandable graphite. .
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Embodiment 3
[0023] Example 3: Put the expandable graphite in the drying tank, the temperature of the drying tank is controlled at 35°C, so that each particle of graphite is evenly heated, and when the moisture content of the expandable graphite drops to 1%, the graphite mass should be 1.2% Evenly spray the sodium phosphate solution with a mass percentage concentration of 50%. After the sodium phosphate solution is evenly distributed on the graphite particles, continue stirring, and then spray 0.6% of the graphite mass with a mass percentage concentration of 50% sodium molybdate solution on the graphite particles. , Stir evenly, and the speed of rotation and stirring should not damage the graphite scales. After the stirring is completed, store it in plastic mulch for 12-16 hours. Keep it closed as much as possible during storage. After storage, high-purity expandable graphite with low thermal weight loss is obtained.
[0024] The obtained expandable graphite contains 99.1% carbon; 0.04% pho...
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