Graphene/nano-silica/polystyrene hybrid material as well as preparation method and application thereof

Abstract

The invention relates to a graphene/nano-silica/polystyrene hybrid material as well as a preparation method and application thereof. Graphene is dispersed into graphene dispersion liquid; then, a coupling agent and nano-silica are added; next, refined styrene is added; the mixture is emulsified and dispersed by a compound emulsifying agent water solution; after the ultrasonic dispersion, stable emulsified liquid is formed; next, the styrene is initiated by a water-soluble initiator to perform in-situ emulsion polymerization; a graphene/nano-silica/polystyrene emulsion is prepared, and is directly used for a water-soluble adhesive or a polymer emulsion system; or after the demulsification, the graphene/nano-silica/polystyrene hybrid material is prepared, i.e., styrene/SiO2 gel is used for adsorbing graphene; prepared graphene modified organic rigid particles are used as nanometer powder; the problem of difficult graphene dispersion is solved.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a graphene / nano silicon dioxide / polystyrene hybrid material and a preparation method and application thereof. Background technique [0002] Nano-silica and graphene, as two inorganic non-metallic materials, are non-toxic, odorless, and non-polluting, and are widely used in the field of polymer materials. [0003] nano-SiO 2 The small particle size, large specific surface area, and high surface hydroxyl content make it easy to agglomerate, so the solution to the agglomeration problem is to prepare nano-SiO 2 Key issues with materials. nano-SiO 2 There are two main types of surface treatment methods: one uses small organic molecules such as coupling agents for surface treatment, and the other uses polymer-coated particles for surface treatment. Functionalization of nano-SiO with direct coupling agent 2 , the method is simple, but pure coupling agent treatment of ...

AI Technical Summary

Problems solved by technology

[0009] Using the above technical scheme, the prepared graphene / nano-silicon dioxide / polystyrene hybrid material is a graphene-doped organic rigid particle, which uses less graphene, and all the ingredients of the formula work synergistically to make the prepared The obtained graphene / nanometer silicon dioxide / polystyrene hybrid material has good compatibility with other materials, good dispersion and the prepared hybrid material emulsion can be directly used in water-based glue or polymer emulsion system, or emulsion After demulsification, it is used as a nano-powder to solve the problem of large amount of direct addition of graphene in the prior art, high cost, and difficulty in dispersing; the graphene / nanometer silicon dioxide / polystyrene hybrid material is based on polystyrene Ethylene / SiO 2 Gel disperses and coats graphene to make graphene-modified organic rigid particles; styrene-diluted coupling agent solution is used to treat nano-silica for in-situ copolymerization, because the surface functionality of nano-silica treated with coupling agent is greater than 2. That is, with multiple functional double bonds, it is possible to prepare a silica micro-crosslinked polystyrene gel, and the body-shaped network structure of the gel forms a physical dispersion and coating of graphene; Functionalization Treatment of Nano-SiO with Combined Agent 2 , will lead to nano-SiO 2 Agglomeration and uneven surface; if the silane coupling agent is diluted with a solvent and the SiO is wet treated 2 , there will be environmental pollution problems caused by solvent volatilization leading to VOC emissions; while using a mixed solution of styrene and coupling agent to treat nano-SiO 2 Particles are surface treated. On the one hand, the coupling agent diluted with monomer styrene can treat nano-SiO more uniformly. 2 surface, and does not need to remove styrene monomer; on the other hand, the monomer mixed solution containing coupling 2 Acts as a swelling effect and inhibits the SiO 2 agglomeration, thereby resolving the nano-SiO 2 Surface treatment is difficult to make SiO 2 After surface treatment, the dispersibility is good, the surface is uniform, and there is no environmental pollution problem of VOC emissions caused by solvent volatilization

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