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A kind of preparation method of graphene modified polyurethane conductive coating

A graphene modification, conductive coating technology, applied in conductive coatings and other directions, can solve the problem of low conductivity of water-based polyurethane materials, and achieve good conductivity and improve conductivity.

Active Publication Date: 2017-12-08
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a preparation method of graphene-modified polyurethane conductive coating, by modifying graphene oxide, improve the conductivity of water-based polyurethane coating, in order to solve the problem of graphene oxide / water-based polyurethane material The problem of low conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of partially reduced graphene oxide (RGO): 0.5 g of graphene oxide was placed in 200 ml of deionized water, and ultrasonically placed in an ultrasonic cleaner for 1 hour, with an ultrasonic power of 200 W, an ultrasonic frequency of 400 KHz, and an ultrasonic temperature of 20 ° C. To prepare a graphene oxide aqueous dispersion, add 5 g of sodium citrate at a temperature of 40° C., and react for 0.5 h to obtain a uniform and stable RGO dispersion. Centrifuge and filter repeatedly at 8000 rpm until the supernatant is neutral, dry the solid in a vacuum oven at 50°C for 48 hours, take it out and grind it into powder;

[0021] (2) Preparation of modified isocyanate: Take the above 0.01g RGO and add it to 100ml of DMF after dehydration treatment. After ultrasonic dispersion for 0.5h, add 5g of isophorone diisocyanate (dissolved in toluene) at a temperature of 20°C. Nitrogen protection, stirring reaction for 2 hours, repeated centrifugation and filtration unde...

Embodiment 2

[0024] (1) Preparation of partially reduced graphene oxide (RGO): 2 g of graphene oxide was placed in 200 ml of deionized water, and ultrasonically ultrasonicated for 5 hours in an ultrasonic cleaner with an ultrasonic power of 200 W, an ultrasonic frequency of 400 KHz, and an ultrasonic temperature of 50 ° C. To the graphene oxide aqueous dispersion, add 40 g of sodium borohydride at a temperature of 100° C., and react for 8 hours to obtain a uniform and stable RGO dispersion. Centrifuge and filter repeatedly at 8000 rpm until the supernatant is neutral, dry the solid in a vacuum oven at 50°C for 48 hours, take it out and grind it into powder;

[0025] (2) Preparation of modified isocyanate: Take the above 0.1g RGO and add it to 100ml of DMF after dehydration treatment. After ultrasonic dispersion for 0.5h, add 50g of 1,6-hexamethylene diisocyanate dissolved in benzene at a temperature of 100°C. Nitrogen protection, stirring reaction for 2 hours, repeated centrifugation and f...

Embodiment 3

[0028] (1) Preparation of partially reduced graphene oxide (RGO): 0.501 g of graphene oxide was placed in 200 ml of deionized water, and ultrasonically ultrasonicated for 1 hour in an ultrasonic cleaner with an ultrasonic power of 200 W, an ultrasonic frequency of 400 KHz, and an ultrasonic temperature of 20 ° C. To obtain an aqueous dispersion of graphene oxide, add 5.002 g of sodium citrate at a temperature of 60° C. and react for 0.5 h to obtain a uniform and stable RGO dispersion. Centrifuge and filter repeatedly at 8000 rpm until the supernatant is neutral, dry the solid in a vacuum oven at 50°C for 48 hours, take it out and grind it into powder;

[0029] (2) Preparation of modified isocyanate: Take the above 0.014g RGO and add it to 100ml of DMF after dehydration treatment, after ultrasonic dispersion for 0.5h, add 5.005g of toluene diisocyanate dissolved in benzene at a temperature of 80°C, protect with nitrogen, and stir After reacting for 2 hours, repeat centrifugatio...

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Abstract

The invention discloses a preparation method of a graphene-modified polyurethane conductive coating. The steps of the preparation method are as follows: graphene is reduced partially and oxidated, so that the graphene keeps part of the hydroxyl groups; isocyanate is modified by the reaction between the hydroxyl groups and isocyanic acid radical, and conductive aqueous polyurethane is synthesized from the modified isocyanate as material for the preparation of the aqueous polyurethane, oligomeric dihydric alcohol, hydrophilic agent and chain extender. Because the partially reduced oxidated graphene has good electrical conductivity and dispersivity, the electrical conductivity, mechanical properties, aging property and water resistance of the coating can be enhanced; the coating can be used on the surfaces of leather, textiles, timbers, metal materials and electronic devices in order to improve the properties of the surfaces, such as static electricity resistance, heat dispersion, water resistance, aging resistance and electromagnetic shielding property.

Description

technical field [0001] The invention relates to a preparation method of paint, in particular to a preparation method of conductive paint. technical background [0002] Since the existence of graphene was successfully confirmed by Geim and his colleagues at the University of Manchester in 2004, this two-dimensional sheet-structured nanomaterial has attracted widespread attention from scientists. Because it has many excellent properties of graphite and carbon nanotubes, especially many unique properties such as good electrical conductivity, mechanical properties, thermal conductivity, quantum Hall effect and no obvious biological toxicity, it is used in metal materials, high Molecular materials and inorganic non-metallic materials have good application prospects. [0003] Conductive coating is a new type of special coating that has emerged and developed in recent years. It is widely used in fields such as rubber, plastics and electronic products because of its superior antist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/32C08K9/04C08K3/04C09D175/06C09D175/08C09D5/24
CPCC08G18/0823C08G18/12C08G18/3203C08G18/348C08G18/4277C08G18/44C08G18/4825C08G18/4854C08G18/664C08G18/6659C08G18/6674C08G18/6692C08K3/04C08K9/04C08K2201/001C09D5/24C09D175/06C09D175/08C08G18/3228
Inventor 王全杰王闪闪刁屾段宝荣张萌萌丁海燕王小龙栾俊
Owner YANTAI UNIV
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