Preparation method of functionalized graphene modified waterborne polyurethane single-component conductive adhesive
A water-based polyurethane, polyurethane single technology, applied in the direction of polyurea/polyurethane adhesives, conductive adhesives, adhesives, etc., can solve the problem of water-based polyurethane and graphene not combining to form conductive adhesives, etc., to achieve low cost of use, processing Simple, flexible effect
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Embodiment 1
[0030] (1) Preparation of graphene oxide: 3g graphite sheet GF and 18g KMnO 4 stepwise and continuously added to concentrated H 2 SO 4 / H 3 PO 4 (360:40ml) in a 9:1 mixture in a flask and stirred at room temperature. The reaction was then warmed to 50°C and stirred for 8 hours. The reaction vial was not sealed due to the evolution of oxygen during the reaction. During oxidation, the color of the mixture changes from dark green to brownish gray. Cool to room temperature with an ice-water bath, slowly add 400ml of deionized water, continue to stir for 30min, then add 30mL of hydrogen peroxide, and gently stir with a glass rod to reduce the residual oxidant and turn the solution into bright yellow. The mixture was centrifuged (5000 rpm, 5 minutes), and the supernatant was removed. Then wash the sediment with 5% HCl solution (5-7 times, 1 L each time) until no sulfate is detected, and then use deionized water (5-7 times, 1 L each time) until the supernatant The pH is close...
Embodiment 2
[0035] (1) Preparation of graphene oxide: 2g graphite sheet GF and 15g KMnO 4 stepwise and continuously added to concentrated H 2 SO 4 / H 3 PO 4 (320:80ml) mixture in a flask and stirred at room temperature. The reaction was then warmed to 55°C and stirred for 9 hours. The reaction vial was not sealed due to the evolution of oxygen during the reaction. During oxidation, the color of the mixture changes from dark green to brownish gray. Cool to room temperature with an ice-water bath, slowly add 400ml of deionized water, continue to stir for 30min, then add 30mL of hydrogen peroxide, and gently stir with a glass rod to reduce the residual oxidant and turn the solution into bright yellow. The mixture was centrifuged (5000 rpm, 5 minutes), and the supernatant was removed. Then wash the sediment with 5% HCl solution (5-7 times, 1 L each time) until no sulfate is detected, and then use deionized water (5-7 times, 1 L each time) until the supernatant The pH is close to 7. T...
Embodiment 3
[0040] (1) Preparation of graphene oxide: 2g graphite sheet GF and 18g KMnO 4 stepwise and continuously added to concentrated H 2 SO 4 / H 3 PO 4 (280:120ml) mixture in a flask and stirred at room temperature. The reaction was then warmed to 55°C and stirred for 8 hours. The reaction vial was not sealed due to the evolution of oxygen during the reaction. During oxidation, the color of the mixture changes from dark green to brownish gray. Cool to room temperature with an ice-water bath, slowly add 400ml of deionized water, continue to stir for 35min, then add 30mL of hydrogen peroxide, and gently stir with a glass rod to reduce the residual oxidant and turn the solution into bright yellow. The mixture was centrifuged (5000 rpm, 5 minutes), and the supernatant was removed. Then wash the sediment with 5% HCl solution (5-7 times, 1 L each time) until no sulfate is detected, and then use deionized water (5-7 times, 1 L each time) until the supernatant The pH is close to 7. ...
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