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Preparing method of graphene modified waterborne polyurethane composite material

A water-based polyurethane and graphene modification technology, which is applied in graphene, conductive coatings, nano-carbon, etc., can solve the problems of poor dispersion, affecting the compatibility and dispersion of graphene sheets, etc., and achieves low cost and excellent preparation method The effect of simplicity and good application prospects

Inactive Publication Date: 2017-04-19
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong van der Waals force between graphene sheets, graphene sheets are easy to adsorb each other and agglomerate, so their dispersion in solvents is poor, which affects the compatibility of graphene sheets in polymers. properties and dispersibility, which in turn will have some adverse effects on the performance of composite materials

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] see figure 1 . A preparation method of graphene-modified water-based polyurethane composite material, comprising the following steps:

[0043] (1) Preparation of prepolymer

[0044] Add 6.97g of toluene-2,4-diisocyanate (TDI) into a four-necked flask, blow nitrogen into it, and slowly add 18g of polypropylene glycol (PPG, with a number average molecular weight of 2000) dropwise (the polypropylene glycol and toluene-2,4 - The molar ratio of diisocyanate is 0.9-1.5:4), stirring and reacting at 60°C for 2 hours to obtain a prepolymer.

[0045] (2) Preparation of water-based polyurethane emulsion

[0046] ① Add 0.67g of dimethylolpropionic acid (DMPA) to the prepolymer obtained in step (1), and react at 80°C for 1 hour.

[0047] ②Reduce the temperature to 40°C, add acetone to reduce the viscosity, and then add 0.84g of diethylene glycol to react for 1 hour.

[0048] ③Reduce the temperature to 10°C, add 0.51g of triethylamine (TEA), and continue the reaction for 40 minu...

Embodiment 2

[0067] A preparation method of graphene-modified water-based polyurethane composite material, comprising the following steps:

[0068] (1) Preparation of prepolymer

[0069] Add 6.96g of toluene-2,4-diisocyanate (TDI) into a four-necked flask, blow in nitrogen, slowly add 30g of polypropylene glycol (PPG) dropwise, and stir and react at 70°C for 2 hours to obtain a prepolymer.

[0070] (2) Preparation of water-based polyurethane emulsion

[0071] ① Add 0.94g dimethylolpropionic acid (DMPA) to the prepolymer obtained in step (1), and react at 80°C for 2 hours.

[0072] ②Reduce the temperature to 40°C, add acetone to reduce the viscosity, and then add 1.06g of diethylene glycol to react for 1 hour.

[0073] ③Reduce the temperature to 10°C, add 0.81g of triethylamine (TEA), and continue the reaction for 1 hour.

[0074] ④ Add the reaction product to 93g of deionized water, stir, shear and emulsify for 1 hour in an ice-water bath to obtain a water-based polyurethane emulsion wi...

Embodiment 3

[0091] A preparation method of graphene-modified water-based polyurethane composite material, comprising the following steps:

[0092] (1) Preparation of prepolymer

[0093] Add 7.18g of toluene-2,4-diisocyanate (TDI) into a four-necked flask, blow nitrogen gas, slowly add 20g of polypropylene glycol (PPG) dropwise, and stir and react at 70°C for 2 hours to obtain a prepolymer.

[0094] (2) Preparation of water-based polyurethane emulsion

[0095] ①Add 1g of dimethylolpropionic acid (DMPA) to the prepolymer obtained in step (1), and react at 80°C for 1 hour.

[0096] ②Reduce the temperature to 40°C, add acetone to reduce the viscosity, and then add 1.06g of diethylene glycol to react for 1 hour.

[0097] ③Reduce the temperature to 10°C, add 1g of triethylamine (TEA), and continue the reaction for 1 hour.

[0098] ④Add the reaction product to 70g of deionized water, stir, shear and emulsify for 1 hour in an ice-water bath to obtain a water-based polyurethane emulsion with a ...

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Abstract

The invention relates to a preparing method of a graphene modified waterborne polyurethane composite material. The preparing method includes the following steps that (1) a prepolymer is prepared; (2) waterborne polyurethane emulsion is prepared; (3) a graphene aqueous solution is prepared, wherein firstly, graphene oxide is prepared, secondly, graphene reduced by vitamin C is prepared, and thirdly, the graphene aqueous solution is prepared; and (4) the graphene modified waterborne polyurethane composite material is prepared. The prepolymer of polyether glycol and toluene diisocynate obtained after water removal is adopted for preparing the waterborne polyurethane; sodium diphenylaminesulfonate is added into the graphene reduced by the vitamin C to prepare the graphene aqueous solution; and then the waterborne polyurethane and the graphene aqueous solution are subject to ultrasonic dispersion and are treated to obtain the graphene modified waterborne polyurethane composite material. The preparing method is simple and convenient, the cost is low, and high efficiency and environment protection are achieved, the graphene modified waterborne polyurethane composite material is suitable for large-scale production, and very good application prospects on the fields of antistatic protection, building coatings and the like are achieved.

Description

technical field [0001] The invention relates to the technical field of research and development of composite materials, and relates to the research technology of graphene-modified composite materials, in particular to a preparation method of graphene-modified water-based polyurethane composite materials. Background technique [0002] Waterborne polyurethane is a binary colloidal system formed with water as the dispersion medium. It has the advantages of non-toxic, odorless, non-polluting, not easy to damage the painted surface, convenient construction, and easy modification. Therefore, it is widely used in wood coatings, automotive coatings, construction Paints, paper coatings and textile and leather finishing, anti-corrosion coatings for oil pipelines and storage tanks are used in many fields. However, the solvent resistance, thermal stability and mechanical properties of waterborne polyurethane are poor, which also limits its application in some aspects. In order to meet ...

Claims

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Application Information

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IPC IPC(8): C08L75/08C08K5/42C08K3/04C08G18/66C08G18/48C08G18/10C08G18/34C08G18/32C01B32/184C09D175/08C09D5/24
CPCC08K5/42C08G18/10C08G18/4825C08G18/6674C08G18/6692C08K3/04C08L2201/04C08L2203/16C09D5/24C09D175/08C08L75/08C08G18/348C08G18/3206
Inventor 黄建国付建伟
Owner EAST CHINA UNIV OF SCI & TECH
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