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.
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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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