Preparation Of Graphene Oxide Composite And Its Reinfocing And Toughening On Cement-based Materials And Polyurethane Coating

It has been a hot issue of study the reinforcement and toughening of cement-based composites and polyurethane in recent years. In this research, the study on reinforcing and toughening of cement-based composites and polyurethane were carried out using grapheme oxide composites.Graphene oxide dispersion aqueous solution was prepared by modified Hummers method and ultrasonic dispersion. The graphene oxide of high oxygen content was prepared by changing the amount of the oxidizing agent. Naphthalene superplasticizer/graphene oxide composites were prepared by solution blending. It was characterized by FTIR, XRD and EDS. EDS results showed that when graphite 1 g, the concentrated sulfuric acid 30 m L and 3 g of potassium permanganate, the graphene oxide oxygen content reached 45.72%. XRD results showed that GO curve characteristic peaks disappeared in the curve of NS/GO and the number changed from 0.34 nm to 0.86 nm. It illustrated that the GO sheets were completely stripped.After the different dosage of NS/GO composite were added to the cement slurry, the effection of cement hydration time on shape of cement hydration products, the fluidity and viscosity of cement paste, setting time, pore structure and the corresponding mechanical properties of cement composites were investigated. Experimental results showed that when content was 0.06%, harmless hole porosity of cement increased substantially, compressive strength reached 65.4 MPa and folding strength reached 10.6 MPa. SEM results showed that the crystal structure was relatively neat and orderly, formed a dense block structure which was the basis for the formation of high mechanical properties. The mechanisms of the regulation of microstructure of cement hydration products by the NS/GO were summarized through experiment. The composite could make graphene oxide disperse in the body. GO had template effect to the formation of crystals of cement hydration products. It made cement induce the formation of small and uniform shape of the crystal structure which was toughened concrete for building high-performance and long life of concrete with an important significance.SDS/GO composites were prepared by solution blending. The effects of different content on the performance of waterborne polyurethane were studied. The performance was compared with the polyurethane added GO. Octadecyl sulfate reduced GO sheet agglomeration in the blend liquid layer. The results showed that SDS/GO or GO reduced elongation at break of the blend films. But after 0.4% content, SDS/GO effectively slowed the decline of blend film. Blend film absorption rate increased with increasing GO dosage. But at the same dosage, blend film absorption rate added SDS/GO improving faster. In the blend emulsion for leather finishing applications, wear resistance added SDS/GO was more pronounced. Both raised a maximum of 1% content.