Method for preparing expanded graphene lubricant additive, expanded graphene lubricating oil additive and lubricant
A technology of expanded graphite and olefin lubricants, which is applied in the field of nanomaterials and can solve problems such as environmental pollution and matrix metal corrosion
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[0045] According to the method for preparing an expanded graphene lubricant additive according to an embodiment of the present invention, the graphite oxide is fully oxidized between the graphite layers by mixing a high ratio of sulfuric acid and potassium permanganate with natural graphite powder; and then treating the graphite oxide sample at a high temperature , and the particles after the heat treatment are reduced in size and improved in uniformity by ball milling, so as to obtain expanded graphene lubricating additive particles. The preparation process of the graphene is economical and efficient, has good compatibility with lubricating oil, is easy to roll and form a film on the friction interface, and has excellent anti-friction and wear-resisting effects. Even at a lower concentration (graphene mass fraction 0.5%), the friction coefficient can be reduced by 30%, and the wear scar depth can be reduced by 80%. The lubricating graphene additive of the present invention has...
Embodiment 1
[0053] 1) Oxidized natural graphite powder.
[0054] The size of graphite powder is selected from tens of microns to several microns. In a low-temperature water bath environment (near 0°C), slowly stir and mix the concentrated sulfuric acid and potassium permanganate once, the mixing mass is 350 grams, the mass ratio of concentrated sulfuric acid and potassium permanganate is 7:1 and then add 12g of graphite powder, The oxidation reaction was carried out gently at 50°C for 5 hours. Then 2000 g of deionized water was added and the temperature was raised to 80° C. for 1 hour. Finally, 100 g of hydrogen peroxide was added and the solution was cooled.
[0055] 2) Graphite oxide was washed and freeze-dried.
[0056] This step is to filter the mixed liquid, then add 100 g of dilute hydrochloric acid and 1000 g of deionized water to wash, then filter and freeze-dry.
[0057] 3) High temperature expansion treatment of graphite oxide.
[0058] This step is to put the freeze-dried ...
Embodiment 2
[0062] 1) Oxidized natural graphite powder.
[0063] The size of graphite powder is selected from tens of microns to several microns. In a low-temperature water bath environment (near 0°C), slowly stir and mix the concentrated sulfuric acid and potassium permanganate once, the mixing mass is 420 grams, the mass ratio of concentrated sulfuric acid and potassium permanganate is 6:1, and then add 10g of graphite powder , and the oxidation reaction was carried out gently at 50 °C for 6 hours. Then 2000 g of deionized water was added and the temperature was raised to 80° C. for 1 hour. Finally, 100 g of hydrogen peroxide was added and the solution was cooled.
[0064] 2) Graphite oxide was washed and freeze-dried.
[0065] This step is to filter the mixed liquid, then add 50 g of dilute hydrochloric acid and 1000 g of deionized water to wash, and then filter and freeze-dry.
[0066] 3) High temperature expansion treatment of graphite oxide.
[0067] This step is to put the fre...
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Abstract
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