Epoxy resin containing grapheme/nanometer TiO2 composite material and preparing method thereof
A technology of epoxy resin and composite materials, applied in the field of composite materials, can solve the problems of easy agglomeration, even stacking and loss of graphene, and achieve the effect of improving bending performance, impact resistance and tensile performance.
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[0034] The embodiment of the present invention also relates to a preparation method of the epoxy resin, the method comprising using the above-mentioned composite material, bisphenol A and epichlorohydrin as reactants, using sodium hydroxide as a catalyst to perform ring-opening and ring-closing reactions, and then Extraction with benzene and isolation of epoxy resin. Specifically include the following steps:
[0035] (1) Graphene / nano-TiO 2 Stir and disperse the composite material in epichlorohydrin, then add bisphenol A, and heat to 75-80°C in a water bath after stirring fully.
[0036] In one embodiment of the present invention, the graphene / nano-TiO 2 The mass ratio of the composite material, bisphenol A and epichlorohydrin is (0.01-0.5):(20-30):(20-40).
[0037] (2) Add sodium hydroxide solution in the reaction system that step (1) obtains, stop heating after reacting 1.5~2 hours;
[0038] In one embodiment of the present invention, graphene / nano-TiO 2 The composite m...
Embodiment 1
[0057] Preparation of hyperdispersed porous graphene / nano-TiO 2 Composite materials, including the following steps:
[0058] (1) 1g of graphite powder is mixed with 1g of sodium nitrate to obtain a mixture.
[0059] (2) In an ice-water bath, slowly add the mixture obtained in step (1) to 20 ml of concentrated sulfuric acid, stir and mix, slowly add 2 g of potassium permanganate, and continue stirring for 20 min.
[0060] (3) The reaction system obtained in step (2) was removed from the ice-water bath, placed in a water bath and heated to 35° C., and kept for 30 minutes.
[0061] (4) Add a hydrogen peroxide solution with a mass concentration of 30% to the reaction system obtained in step (3), and after reacting for 2 hours, no bubbles are generated in the system at this time. The reaction solution was suction-filtered with a microporous membrane, and the precipitate obtained by the suction filtration was washed with deionized water for several times until no sulfate was detec...
Embodiment 2
[0066] Preparation of hyperdispersed porous graphene / nano-TiO 2 Composite materials, including the following steps:
[0067] (1) 1.5g of graphite powder is mixed with 1.5g of sodium nitrate to obtain a mixture.
[0068] (2) In an ice-water bath, slowly add the mixture obtained in step (1) into 25ml of concentrated sulfuric acid, stir and mix, slowly add 3g of potassium permanganate, and continue stirring for 20min.
[0069] (3) The reaction system obtained in step (2) was removed from the ice-water bath, placed in a water bath and heated to 35° C., and kept for 40 minutes.
[0070] (4) Add a hydrogen peroxide solution with a mass concentration of 30% to the reaction system obtained in step (3), and after reacting for 2 hours, no bubbles are generated in the system at this time. The reaction solution was suction-filtered with a microporous membrane, and the precipitate obtained by the suction filtration was washed with deionized water for several times until no sulfate was de...
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Abstract
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