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Preparing method of graphene/waterborne polyurethane composite material

A technology of water-based polyurethane and composite materials, which is applied in the field of preparation of graphene/water-based polyurethane composite materials, can solve the problems of unsuitability for large-scale industrial production and complicated processes, and achieve good heat resistance, good compatibility, and good water Dispersion effect

Active Publication Date: 2015-08-26
安徽嘉明新材料科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN103805046A directly uses graphite powder to prepare a foamed water-based polyurethane material in situ, which solves the problem that graphene is used as a raw material in the existing graphene / polyurethane composite material preparation method and the process is complicated, which is not suitable for large-scale industrial production. technical issues

Method used

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  • Preparing method of graphene/waterborne polyurethane composite material
  • Preparing method of graphene/waterborne polyurethane composite material
  • Preparing method of graphene/waterborne polyurethane composite material

Examples

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Embodiment 1

[0037] The present embodiment prepares graphene / waterborne polyurethane composite material according to the following steps:

[0038] 1. Preparation of graphene oxide

[0039] Graphite (3.0g), H 2 SO4 (70 mL), NaNO 3 (1.5g) was mixed in a 250mL Erlenmeyer flask under an ice-water bath, stirred evenly by magnetic force, slowly added potassium permanganate (9.0g) and continued to stir in an ice-water bath for 2 hours, and then stirred overnight at 35°C Slowly add 100mL deionized water to stir and dilute; then transfer to a 1000mL beaker, add distilled water to dilute to obtain a mixed solution; slowly stir and add 20mL 30% hydrogen peroxide dropwise to the mixed solution until the color of the mixed solution turns golden yellow, Stand still until the foam disappears, stir and add 200mL, 1.0mol / L HCl solution, and stand still to obtain a precipitate. The precipitate is centrifuged and washed repeatedly, and washed several times to weak acidity, that is, graphite oxide.

[004...

Embodiment 2

[0054] The present embodiment prepares graphene / waterborne polyurethane composite material according to the following steps:

[0055] 1. Preparation of graphene oxide

[0056] Graphite (3.0g), H 2 SO 4 (70 mL), NaNO 3 (1.5g) was mixed in a 250mL Erlenmeyer flask under an ice-water bath, stirred evenly by magnetic force, slowly added potassium permanganate (9.0g) and continued to stir in an ice-water bath for 2 hours, and then stirred overnight at 35°C Slowly add 100mL deionized water to stir and dilute; then transfer to a 1000mL beaker, add distilled water to dilute to obtain a mixed solution; slowly stir and add 20mL 30% hydrogen peroxide dropwise to the mixed solution until the color of the mixed solution turns golden yellow, statically Set aside until the foam disappears, stir and add 200mL, 1.0mol / L HCl solution, and let it stand still to obtain a precipitate. The precipitate is centrifuged and washed repeatedly, and washed several times to weak acidity, that is, graph...

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Abstract

The invention discloses a preparing method of a graphene / waterborne polyurethane composite material. The preparing method is characterized in that firstly, a graphene oxide aqueous dispersion is prepared by an improved Hummers method; then, modified graphene oxide is reduced through ethylenediamine so as to obtain a modified graphene aqueous dispersion; a linear polyurethane prepolymer is synthesized by diisocyanate, a dihydric alcohol oligomer and a chain extender; finally, a neutralizer is added into the linear polyurethane prepolymer for neutralization, and the product is mixed with the modified graphene aqueous dispersion so as to obtain the graphene / waterborne polyurethane composite material. The compatibility of two components in the prepared graphene / waterborne polyurethane composite material is good, and the thermostability and the mechanical strength of waterborne polyurethane are improved through graphene modification. The graphene / waterborne polyurethane composite material can be used as an environment-friendly waterborne paint and has a wide application prospect.

Description

technical field [0001] The present invention relates to a kind of preparation method of graphene / waterborne polyurethane composite material Background technique [0002] Since 2004, A.K.Geim of the University of Manchester in the United Kingdom prepared graphene for the first time by mechanical exfoliation, which has attracted extensive attention in the fields of physics, chemistry, biology and material science. Graphene is a hexagonal ring composed of carbon atoms with sp2 hybrid orbitals to form a honeycomb structure with a thickness of only 0.3354nm. It is a new type of two-dimensional planar material. The special structure of graphene endows it with excellent properties: high Young's modulus, high thermal conductivity, high transparency, room temperature quantum Hall effect and room temperature ferromagnetism, it is considered to have more application prospects than fullerene and carbon nanotubes carbon material. The preparation methods of graphene include mechanical e...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08L75/06C08K9/02C08K3/04C08G18/66
Inventor 杨建军吴庆云张建安吴明元张玉
Owner 安徽嘉明新材料科技有限公司
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