Preparation method of graphene oxide/waterborne polyurethane nanometer composite material

A nano-composite material and water-based polyurethane technology, which is applied in the field of graphene oxide and water-based polyurethane nano, can solve the problems of poor compatibility and poor dispersion of graphene oxide, and achieve low cost, high performance and improved thermal performance. Effect

Inactive Publication Date: 2013-08-21
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiencies of the prior art described in the background (such as poor dispersibility of graphene oxide in organic solvents and poor compatibility with WPU), and proposes a uniform and stable functionalized graphene oxide modified Waterborne polyurethane technology

Method used

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  • Preparation method of graphene oxide/waterborne polyurethane nanometer composite material
  • Preparation method of graphene oxide/waterborne polyurethane nanometer composite material
  • Preparation method of graphene oxide/waterborne polyurethane nanometer composite material

Examples

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Effect test

example 1

[0031] Example 1: Preparation of Graphene Oxide

[0032] 1. Preparation of graphite oxide: Use the improved Hummer method to take 2g of natural flake graphite and put it into a 250mL three-neck flask, add 2g of sodium nitrate, slowly pour 96mL of concentrated sulfuric acid, and then slowly add 14g of potassium permanganate, Ice bath, stir for 90 minutes, then transfer to a water bath at 35°C, heat and stir for 2 hours, then slowly add 80mL of deionized water, due to the presence of concentrated sulfuric acid, the heat release is severe, so put the flask in water to cool for 5 minutes Finally, add 200mL of deionized water, then slowly add hydrogen peroxide to the flask to eliminate excess potassium permanganate until no bubbles are generated; finally add a large amount of deionized water to dilute, settle, stand overnight, and continue to wash for more Repeat until the pH value of the solution is neutral, and then go through the centrifugal washing of a low-speed centrifuge (...

example 2

[0034] Example 2: Preparation of graphene oxide modified by silane coupling agent (KH550)

[0035] Slowly add 20mL of dehydrated alcohol containing 0.3g KH550 into the graphene oxide suspension prepared by Example 1, and keep stirring during the addition process; 2 React in an oil bath at 90°C for 24 hours under protection. The obtained pasty product was first washed 3 times with absolute ethanol to remove excess KH550, then washed 3 times with deionized water, and finally vacuum-dried at 60°C.

example 3

[0036] Example 3: Preparation of functionalized graphene oxide / waterborne polyurethane

[0037] 1. Use 250mL of acetone and ultrasonic to prepare 0.5g of functionalized graphene oxide in Example 2 to make a uniform dispersion of 2mg / mL, and then put it together with 34g of polypropylene glycol (N220) into an agitator, reflux condenser and Stir in the three-necked flask of the dropping funnel, stir evenly at 80°C, add 1.8g of DMPA, after it is completely dissolved, then add 12g of IPDI and 0.25g of dibutyltin dilaurate and maintain the reaction at 80°C; the viscosity of the mixture increases, so Use the method of dropping acetone to reduce the viscosity so that the stirring can proceed smoothly. After continuing to react under the above conditions for 2 hours, add 1gTMP to carry out the cross-linking reaction; Make the stirring go smoothly, then add 1.5gTEA to neutralize, continue stirring for 20min, then quickly add 100mL water and 0.8gEDA to emulsify for 1h under the condit...

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Abstract

The invention relates to a preparation method of a graphene oxide/waterborne polyurethane nanometer composite material. Especially, the preparation method comprises the following steps of: utilizing gamma-aminopropyl triethoxysilane (KH550) to carry out surface modification (functionalization of graphene oxide) onto graphene oxide; lowering hydrophily of a graphene oxide sheet layer; improving dispersion of the graphene oxide sheet layer in an organic solvent and compatibility of the graphene oxide and the polymer; and utilizing an in-situ polymerization method to prepare the graphene oxide/waterborne polyurethane nanometer composite material. The preparation method of the graphene oxide/waterborne polyurethane nanometer composite material belongs to the preparation field of composite materials.

Description

technical field [0001] The invention relates to a preparation method of graphene oxide and water-based polyurethane nanocomposite material, specifically referring to the surface modification of graphene oxide (functionalized graphene oxide) by using γ-aminopropyltriethoxysilane (KH550), reducing the The hydrophilicity of graphene oxide sheets improves its dispersion in organic solvents and compatibility with polymers, and then prepares graphene oxide / waterborne polyurethane nanocomposites by in-situ polymerization, which belongs to the preparation of composite materials field. Background technique [0002] Water-based polyurethane (WPU) resin has the advantages of high hardness, strong adhesion, corrosion resistance, solvent resistance, and low content of volatile organic compounds. Packaging materials and coatings industry have good development prospects; however, compared with organic solvent polyurethane (PU), WPU has lower thermal stability, solvent resistance and mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/66C08G18/12C08L75/08C08K9/06C08K3/04
Inventor 丁建宁尚慧袁宁一储富强林本才
Owner CHANGZHOU UNIV
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