A kind of highly conductive waterborne polyurethane/modified graphene composite emulsion and its preparation method
A technology of water-based polyurethane and graphene, which is applied in polyurea/polyurethane adhesives, polyurea/polyurethane coatings, non-polymer adhesive additives, etc., can solve the problems of restricting the wide application of water-based polyurethane and the easy aggregation and dispersion of graphene problem, to achieve the effect of easy control of reaction, improvement of electrical performance and good dispersion effect
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Embodiment 1
[0056] The preparation method of aqueous polyurethane emulsion and film is specifically:
[0057] Add 25.1g of isophorone diisocyanate (IPDI) into a 1000mL four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and add 70.0g of polycarbonate polyol (PCDL2000) dropwise with a dropping funnel while stirring at room temperature. ) and 0.15g of catalyst dibutyltin dilaurate (DBTDL), the dropping speed is controlled within 1.5h, after the addition is completed, react at 50°C for 2h; then heat up to 60°C, add 4.96g of dimethylolpropionic acid (DMPA) , reacted for 6h, and measured the degree of reaction by the toluene-di-n-butylamine back titration method until the NCO group content reached the theoretical value; then added 2.10g of triethylamine to the polyurethane prepolymer and reacted for 1.5h; Deionized water is added dropwise for emulsification to obtain an emulsion; the nanocomposite emulsion is moved into a glass mold and dried to obtain a water-base...
Embodiment 2
[0059] Preparation of modified graphene oxide dispersion:
[0060] Add the graphene oxide dispersion (concentration: 5mg / mL) into a 2L three-necked flask, add hyperbranched polyethyleneimine (PEI) according to the mass ratio of 6:4 under high-speed stirring, and then use 1mol / L NaOH to adjust the pH Adjusted to 14, stirred at room temperature for 12h. Pour the reaction mixture into a 2L large beaker, adjust the pH to 5.5 with 1mol / L HCl, and then add 1-ethyl-(3-dimethylaminopropyl) carbon according to the ratio (1:2:20) Diimine hydrochloride and N-hydroxysuccinimide compound, and ultrasonic 0.5h in water bath. Finally, pour the prepared liquid in the beaker back into a 2L three-necked flask and stir for 24 hours under an ice-water bath. The reaction mixture obtained in the previous step was washed by centrifugation with 1mol / L HCl, acetone and water for purification, and finally the solid in the centrifuge tube was taken out and redispersed in water and N,N-dimethylpyrrolido...
Embodiment 3
[0062] The preparation method of aqueous polyurethane / modified graphene oxide nanocomposite emulsion and composite membrane is specifically:
[0063] Add 25.1g of isophorone diisocyanate (IPDI) in a 1000mL four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and add 70.0g of polycarbonate polyol (PCD2000) dropwise with a dropping funnel while stirring at room temperature. ) and 0.15g of catalyst dibutyltin dilaurate (DBTDL), the dropping speed is controlled within 1.5h, after the addition is completed, react at 50°C for 2h; then heat up to 60°C, add 4.96g of dimethylolpropionic acid (DMPA) , react for 6h, measure the degree of reaction by toluene-di-n-butylamine back titration until the content of NCO groups reaches the theoretical value; then add 2.10g of triethylamine to the polyurethane prepolymer, and react for 1.5h; properly adjust the viscosity Add it dropwise into modified graphene oxide dispersions (water dispersion, 2mg / mL) with different c...
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