Waterborne polyurethane/dopamine modified graphene nano-composite emulsion preparation method

A water-based polyurethane and nanocomposite technology, applied in the field of organic-inorganic nanocomposite materials, can solve the problems of easy agglomeration, difficult to disperse, low reactivity, etc., and achieve the effects of good adhesion, easy reaction control, and improved mechanical properties.

Active Publication Date: 2018-03-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because graphene is neither hydrophilic nor lipophilic, and its reactivity is low, and its adjacent she...

Method used

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  • Waterborne polyurethane/dopamine modified graphene nano-composite emulsion preparation method
  • Waterborne polyurethane/dopamine modified graphene nano-composite emulsion preparation method
  • Waterborne polyurethane/dopamine modified graphene nano-composite emulsion preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of aqueous polyurethane emulsion and film: Add 25.1g isophorone diisocyanate (IPDI) in a 1000mL four-necked flask equipped with a stirrer, thermometer and reflux condenser, and add 70.0 g of isophorone diisocyanate (IPDI) dropwise with a dropping funnel while stirring at room temperature. g polycarbonate multi-component (PCDL2000) and 0.15g catalyst dibutyltin dilaurate (DBTDL), the dropping rate is controlled within 1.5h, after the addition is completed, react at 50±5°C for 1-2h; then heat up to 60±5°C , add 4.96g dimethylolpropionic acid (DMPA), react for 5-6h, measure the degree of reaction by the toluene-di-n-butylamine back titration method, until the NCO group content reaches the theoretical value; then add 2.10g to the resin Potassium hydroxide, reacted for 1.5h; deionized water was added dropwise to the system for emulsification; membrane was formed and dried to obtain a water-based polyurethane membrane.

Embodiment 2

[0030] Preparation of water-based polyurethane / graphene nanocomposite emulsion and composite film: add 25.1g isophorone diisocyanate (IPDI) in a 1000mL four-necked flask equipped with a stirrer, thermometer and reflux condenser, and use it while stirring at room temperature Add 70.0g of polycarbonate polyol (PCD2000) and 0.15g of catalyst dibutyltin dilaurate (DBTDL) dropwise into the dropping funnel, the dropping speed is controlled within 1.5h, and react at 50±5°C for 1-2h after dropping; Then be warming up to 60 ℃, add 4.96g dimethylolpropionic acid (DMPA), react 5-6h, measure reaction degree by toluene-di-n-butylamine back titration, until measuring NCO group content reaches theoretical value; Then to Add 2.10g of potassium hydroxide to the resin, and react for 1.5h; properly adjust the viscosity, add it dropwise into 200mL of graphene oxide dispersion (mixture of water and DMF, 10mg / mL), and stir at high speed for 1h; Deionized water was added dropwise for emulsification;...

Embodiment 3

[0032]Preparation of water-based polyurethane / dopamine-modified graphene nanocomposite emulsion and composite film: Add 25.1g isophorone diisocyanate (IPDI) to a 1000mL four-necked flask equipped with a stirrer, thermometer and reflux condenser. While stirring, add 70.0g polycarbonate polyol (PCD2000) and 0.15g catalyst dibutyltin dilaurate (DBTDL) dropwise with a dropping funnel, and the dropping rate is controlled within 1.5h. -2h; then heat up to 60°C, add 4.96g dimethylolpropionic acid (DMPA), react for 5-6h, measure the reaction degree by toluene-di-n-butylamine back titration, until the NCO group content reaches the theoretical value Then add 2.10g of potassium hydroxide to the resin and react for 1.5h; properly adjust the viscosity and add it dropwise into 200mL of dopamine-modified graphene oxide dispersion (water and DMF mixture, 10mg / mL), stirring at high speed React for 1 hour; add deionized water dropwise to the system for emulsification; finally add a certain prop...

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Abstract

The invention discloses a waterborne polyurethane/dopamine modified graphene nano-composite emulsion preparation method and belongs to the field of organic-inorganic nano-composite materials. According to the preparation method, an improved Hummers method is utilized to prepare graphene oxide dispersion liquid at first, and then dopamine is utilized to surface modify the graphene oxide and compounded with waterborne polyurethane to prepare a waterborne polyurethane/dopamine modified graphene nano-composite emulsion. According to the preparation method disclosed by the invention, low polymer polyalcohol is utilized as a soft segment, isocyanate compound is utilized as a hard segment, and the dopamine modified graphene oxide dispersion liquid is guided into a waterborne polyurethane preparation process in site to prepare the waterborne polyurethane/dopamine modified graphene nano-composite emulsion. As the dopamine modified graphene is guided into, mechanical property, static resistance,conductivity, electromagnetic shielding, thermal conductivity, chemical resistance, corrosion resistance and the like of waterborne polyurethane membranes and coatings are effectively improved. The waterborne polyurethane/dopamine modified graphene nano-composite emulsion and rubber powder have a better application prospect in the fields of coatings, adhesives, printing ink, surface treating agents, elastomer, foam materials, functional films and the like.

Description

technical field [0001] The invention relates to a method for preparing a water-based polyurethane / dopamine-modified graphene nanocomposite emulsion, in particular to the preparation of dopamine surface-modified graphene oxide and the composite preparation of water-based polyurethane and dopamine-modified graphene oxide dispersion liquid to prepare water-based polyurethane / graphene The nanocomposite emulsion belongs to the field of organic-inorganic nanocomposite materials. Background technique [0002] Water-based polyurethane (WPU) uses water as the dispersion medium. It has good comprehensive performance, safety and environmental protection, and is increasingly widely used in the fields of coatings, adhesives, inks, sealants and surface treatment agents. However, the mechanical properties (strength, modulus) and chemical resistance of the latex film are still not comparable to the traditional solvent-based polyurethane, thus limiting the further wide application of water-b...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/44C08G18/34C08K9/04C08K7/00C08K3/04
CPCC08G18/348C08G18/44C08G18/6659C08K3/04C08K7/00C08K9/04
Inventor 顾飚张丹丹孙萌杨一帆李振董卫龙张胜文
Owner JIANGNAN UNIV
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