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Preparation method of waterborne polyurethane/graphene nano-composite emulsion

A water-based polyurethane and nano-composite technology, which is applied in the field of preparation of inorganic nano-material modified polyurethane, can solve the problems that limit the wide application of water-based polyurethane, and achieve the effect of enhanced interaction force, easy control of reaction and good repeatability

Active Publication Date: 2017-11-24
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties (strength, modulus) and solvent resistance of the latex film are not comparable to the traditional solvent-based polyurethane, thus limiting the further wide application of water-based polyurethane.

Method used

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  • Preparation method of waterborne polyurethane/graphene nano-composite emulsion
  • Preparation method of waterborne polyurethane/graphene nano-composite emulsion
  • Preparation method of waterborne polyurethane/graphene nano-composite emulsion

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 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; Add deionized water dropwise to the system to emulsify; Form a film, dry to obtain a water-based polyurethane film, and perform a tensile property test on the film (such as image 3 ) and SEM...

Embodiment 2

[0027] 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 condensing tube, and use dropwise while stirring at room temperature Add 70.0g of polycarbonate polyol (PCD2000) and 0.15g of catalyst dibutyltin dilaurate (DBTDL) dropwise into the liquid funnel, and the dropping rate is controlled within 1.5h. After the dropping is completed, react at 50±5°C for 1-2h; then Raise the temperature to 60°C, add 4.96g dimethylol propionic acid (DMPA), react for 5-6h, measure the reaction degree by the toluene-di-n-butylamine back titration method, until the NCO group content reaches the theoretical value; then add to the resin Add 2.10g of potassium hydroxide to the solution, 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 react with h...

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Abstract

The invention relates to a preparation method of waterborne polyurethane / graphene nano-composite emulsion, and belongs to the field of organic-inorganic nano-composite materials. According to the preparation method, graphene oxide dispersion liquid is prepared by adopting an improved Hummers method, and is compounded with waterborne polyurethane to obtain the waterborne polyurethane / graphene nano-composite emulsion. By use of the preparation method disclosed by the invention, the waterborne polyurethane / graphene nano-composite emulsion is prepared by taking oligomer polyol as a soft segment, taking an isocyanate compound as a hard segment and carrying out in-situ introduction of the graphene oxide dispersion liquid in the preparation process of the waterborne polyurethane. The mechanical property, antistatic property, conductive property, electromagnetic shielding property, thermal conductivity, chemical resistance, corrosion resistance and the like of a waterborne polyurethane film and a coating are effectively improved by introducing grapheme. The waterborne polyurethane / graphene nano-composite emulsion has a better application prospect in the fields of coating materials, adhesives, ink, surface treatment agents, elastomers, foaming materials, functional films and the like.

Description

technical field [0001] The invention relates to a preparation method of water-based polyurethane / graphene nanocomposite emulsion, in particular to the preparation of graphene oxide dispersion and the method of adding water-based polyurethane to graphene oxide dispersion to prepare modified water-based polyurethane nanocomposite materials, belonging to The field of preparation of inorganic nanomaterial modified polyurethane. Background technique [0002] Water-based polyurethane (WPU) uses water as the dispersion medium and has high molecular weight. It is widely used in coatings, adhesives, inks, sealants and surface treatment agents because it is non-toxic, non-polluting and inexpensive. However, the mechanical properties (strength, modulus) and solvent resistance of the latex film are not comparable to the traditional solvent-based polyurethane, thus limiting the further wide application of water-based polyurethane. In response to this phenomenon, the use of inorganic nan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08K3/04C08G18/75C08G18/66C08G18/44C08G18/34C08J3/20
CPCC08G18/348C08G18/44C08G18/6659C08G18/755C08J3/205C08J2375/04C08K3/04C08K2201/011C08L75/04
Inventor 张胜文张丹丹杨一帆孙萌牧景严淑婷东为富
Owner JIANGNAN UNIV
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