A kind of preparation method of monolayer graphene oxide modified waterborne polyurethane composite material
A water-based polyurethane and graphene modification technology, which is applied in the field of preparation of single-layer graphene oxide modified water-based polyurethane composite materials, can solve the problems of thick GO layers, difficulty in exerting the performance of graphene oxide, and easy agglomeration, etc., to achieve The effect of mechanical property advantages
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Embodiment 1
[0027] (1) Preparation of single-layer graphene oxide: using a new type of iron-based strengthening agent, potassium ferrate, to oxidize and exfoliate flake graphite. Take flake graphite with a particle size of 40 μm and 98% concentrated sulfuric acid at -10°C and stir, mix and infiltrate 0.5 h, add potassium ferrate and periodate, then raise the reaction solution to 0°C for 1 h. After the reaction, the reaction solution was centrifuged at 4000 r / min to discard the strong acid. Slowly pour the sediment at the bottom into deionized water at 2°C to dilute, let stand for 0.5h, wash the sediment repeatedly with 1 mol / L dilute hydrochloric acid and deionized water, wash each 15 times in turn, and centrifuge until the centrifuged supernatant The pH value of the solution was close to 7, and the final product was freeze-dried at -40 °C for 48 h to obtain a single-layer graphene oxide. During the reaction, the ratio of strong acid to graphite was 10mL: 1 g, and the ratio of potassium ...
Embodiment 2
[0034] (1) Preparation of single-layer graphene oxide: using a new type of iron-based strong oxidant, potassium ferrate, to oxidize and exfoliate flake graphite, take flake graphite with a particle size of 10 μm and 98% concentrated sulfuric acid at -10°C, mix and infiltrate 0.5 h, add potassium ferrate and periodate, then raise the reaction solution to 0°C for 1 h. After the reaction, the reaction solution was centrifuged at 4000 r / min to discard the strong acid. Slowly pour the sediment at the bottom into deionized water at 5°C to dilute, let stand for 0.5h, wash the sediment repeatedly with 1 mol / L dilute hydrochloric acid and deionized water, wash each 15 times in turn, and centrifuge until the centrifuged supernatant The pH value of the solution was close to 7, and the final product-50 was freeze-dried for 48 h to obtain a single-layer graphene oxide. During the reaction, the ratio of strong acid to graphite was 50mL: 1 g, and the ratio of potassium ferrate, periodic aci...
Embodiment 3
[0039] (1) Preparation of single-layer graphene oxide: using a new type of iron-based strong oxidant, potassium ferrate, to oxidize and exfoliate flake graphite, take flake graphite with a particle size of 40 μm and 98% concentrated sulfuric acid at -10°C and stir, mix and infiltrate 0.5 h, add potassium ferrate and perchloric acid, then raise the reaction solution to 0°C for 1 h. After the reaction, the reaction solution was centrifuged at 4000 r / min to discard the strong acid. Slowly pour the sediment at the bottom into deionized water at 10°C to dilute, let stand for 0.5 h, wash the sediment repeatedly with 1 mol / L dilute hydrochloric acid and deionized water, wash each 15 times in sequence, and centrifuge until the supernatant The pH value of the solution was close to 7, and the final product was freeze-dried at -30 °C for 48 h to obtain a single-layer graphene oxide. During the reaction, the ratio of strong acid to graphite was 80 mL: 1 g, and the ratio of potassium ferr...
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