A kind of preparation method of high-performance polyvinyl alcohol/graphene composite film

A graphene composite and polyvinyl alcohol technology, applied in the direction of graphene, nano-carbon, etc., can solve the problems of insufficient interfacial bonding force and thermal performance to be improved, and achieve strong interfacial bonding force, improved performance, and good dispersion effect Effect

Active Publication Date: 2020-11-13
JIANGSU YANGNONG CHEM GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These patents all use the solution blending method to prepare polyvinyl alcohol graphene composite materials, the interface bonding force is not strong enough, and the mechanical properties and thermal properties need to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1.1 Preparation of graphene oxide (GO) dispersion

[0024] 1.1.1 The specific operation is as follows:

[0025] Pour 92mL of concentrated sulfuric acid (98%) into a 500mL dry three-neck flask, and cool to 0°C. Then slowly add 4g of graphite and 2g of sodium nitrate into concentrated sulfuric acid, be careful not to hang the graphite on the wall, and mechanically stir for 20 minutes to disperse the graphite evenly. Then slowly add 12g of potassium permanganate, continue stirring for 3h, and control the reaction temperature below 10°C. The three-neck flask was transferred to an oil bath at 35°C, kept at a constant temperature and stirred for 3 hours. It was found that the mixture changed from black to taupe. Then slowly add 200 mL of deionized water, keeping the temperature between 90 and 98 °C. Then quickly transfer to 90 ℃ oil bath, maintain 15min, keep stirring. Add 560mL deionized water to the system to dilute, the color of the system turns brownish yellow, then a...

Embodiment 2

[0031] The operation and conditions are the same as in Example 1, except that the amount of the graphene oxide dispersion is changed to 20g. A 200 μm polyvinyl alcohol / graphene nanocomposite film with a graphene mass fraction of 0.2% was prepared. SEM shows that the cross-section is smooth and orderly, the measured tensile strength is 153MPa, and the melting point by DSC is 235°C.

Embodiment 3

[0033] The operation and conditions are the same as in Example 1, except that the amount of the graphene oxide dispersion is changed to 60g. To make a 200 μm polyvinyl alcohol / graphene nanocomposite film with a graphene mass fraction of 0.6%. SEM shows that the section is slightly wrinkled, the measured tensile strength is 123MPa, and the melting point by DSC is 231°C.

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Abstract

The invention belongs to the technical field of polymer composite material preparation, in particular to a preparation method for polyvinyl alcohol / graphene composite thin film. A new technology method is adopted to prepare the polyvinyl alcohol / graphene composite thin film, in-situ polymerization is conducted to prepare a polyvinyl alcohol / oxidized graphene solution, then a small amount of dopamine is added and reacts with the solution at the certain temperature and under an alkaline condition, after drying, the film is formed, and the polyvinyl alcohol / graphene composite thin film is prepared. Compared with a solution blending method, the composite thin film prepared by adopting the method has excellent mechanical and heat-resisting properties.

Description

technical field [0001] The invention belongs to the technical field of polymer composite material preparation, and in particular relates to a preparation method for preparing polyvinyl alcohol / graphene film. Background technique [0002] Polyvinyl alcohol is a typical crystalline water-soluble polymer. It has excellent water solubility, high strength and high modulus, solvent resistance, gas barrier property and biodegradability, etc. In addition to being used as vinylon fiber, it is also widely used as film, coating, adhesive, emulsifier, dispersant and other products, and its application range covers textile, medicine, wood, food, construction, printing, steel, polymer chemical industry and other industries. . Polyvinyl alcohol is a kind of flexible polymer, and its own mechanical properties and heat resistance properties often cannot meet higher requirements for use. Therefore, improving the mechanical properties and heat resistance of polyvinyl alcohol by compounding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08K9/04C08K3/04C08J5/18C08F118/08C08F2/44C08F8/00C01B32/184C08G73/06
CPCC01B32/184C08F2/44C08F8/00C08G73/0672C08J5/18C08J2329/04C08K3/042C08K9/08C08F118/08
Inventor 寇书培丁克鸿徐林张寅陆仁标
Owner JIANGSU YANGNONG CHEM GROUP
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