Preparation methods of surface-modified graphene oxide and surface-modified graphene oxide composite material
A technology of surface modification and composite materials, which is applied in the field of new materials, can solve the problems of poor mechanical properties and wear resistance, and achieve the effects of good mechanical properties, smooth wear surface, and simple and feasible modification methods
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Embodiment 1
[0028] The preparation method of surface-modified graphene oxide is to add graphene oxide into KH550 solution, react at 75°C for 25 hours, centrifuge at 4000rpm after the reaction, wash and filter with deionized water three times , followed by low-temperature vacuum drying at 60°C to obtain surface-modified graphene oxide. The concentration of the above KH550 solution is 2.3%; the weight ratio of graphene oxide and KH550 solution is 1:17. The KH550 has a unique -NH 2 , can react with carboxyl groups and epoxy groups on the graphene oxide layer, so that KH550 can be inserted between graphite oxide layers, grafted on graphene oxide, and introduce long carbon chains on its surface to change its ordered structure and increase The contact angle is lowered, thereby reducing the hydrophilicity between the GO layers, increasing the lipophilicity, and improving the dispersion of graphene oxide in the polymer. At the same time, due to the -NH2 reduction of KH550, GO removes most of the...
Embodiment 2
[0032] The preparation method of surface-modified graphene oxide is to add graphene oxide into KH550 solution, react at 80°C for 24 hours, centrifuge at 5000rpm after the reaction, wash and filter with deionized water three times , followed by low-temperature vacuum drying at 60°C to obtain surface-modified graphene oxide. The concentration of the above KH550 solution is 2.0%; the weight ratio of graphene oxide and KH550 solution is 1:20.
[0033] The above KH550 solution contains 0.04mM tartaric acid, and the tartaric acid contains 0.03% L-tartaric acid.
[0034] The preparation method of the surface-modified graphene oxide composite material, the surface-modified graphene oxide and the phenolic resin are melt-blended, the melt-blending extrusion temperature is 135°C, the filler is added and mixed evenly, and then mixed on an open plastic mixer After mixing, the materials are pulverized, and the composite material is prepared by compression molding, and then cured to obtain ...
Embodiment 3
[0036] The preparation method of the surface modified graphene oxide composite material, further optimization steps are:
[0037] The surface-modified graphene oxide and phenolic resin are melt-blended, and the melt-blending extrusion temperature is 135°C. After adding fillers and mixing evenly, they are mixed on an open plastic mixer. After mixing, the materials are crushed and molded. The surface-modified graphene oxide composite material is obtained by curing after preparing the composite material. The molding temperature above is: 168°C, the pressure is: 5MPa; the curing program is: 120°C for 2h, 140°C for 2h, 160°C for 2h, and 180°C for 2h.
[0038] Contain curing accelerator in the above-mentioned filler, the addition of curing accelerator is 0.68% of phenolic resin weight, and curing accelerator is propylene carbonate, diisocyanate and octadecanoic acid that mol ratio is 1:1.43:0.027, and curing accelerator The ester group in the agent plays the role of increasing the ...
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