Sulfonated graphene modified waterborne polyurethane resin and its preparation method
A water-based polyurethane and graphene modification technology, applied in chemical instruments and methods, inorganic chemistry, carbon compounds, etc., can solve the problems that graphene cannot be dispersed in a single layer and affects the leveling and mechanical properties of composite materials
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Embodiment 1
[0034] Add 5g of graphite to 120ml of concentrated sulfuric acid with a weight concentration of 98%, 50ml of concentrated nitric acid with a weight concentration of 65%, and 25g of potassium permanganate mixed solution at 45°C for 1.5h, then add 30% hydrogen peroxide dropwise until the mixed solution is bright yellow After the dispersion, filter to obtain graphene oxide GO;
[0035] Take 2g graphene oxide and disperse it in 1.0L deionized water, add 0.5g benzenesulfonate diazonium salt, react for 1h, the diazo group reacts with sp2 hybridized carbon atoms to obtain sulfonated graphene oxide S-GO; add 1 g of sodium borohydride was reacted at 60°C for 1 h to obtain sulfonated graphene 1.
Embodiment 2
[0037] Add 5g of graphite to 100ml of concentrated sulfuric acid with a weight concentration of 98%, 25ml of concentrated nitric acid with a weight concentration of 65%, and 20g of potassium permanganate mixed solution at 55°C for 1 hour, and add 30% hydrogen peroxide dropwise until the mixed solution is bright yellow and dispersed. After liquid, filter to obtain graphene oxide GO;
[0038] Take 2g graphene oxide and disperse it in 0.8L deionized water, add 0.5g benzenesulfonate diazonium salt, react for 1h, the diazo group reacts with sp2 hybridized carbon atoms to obtain sulfonated graphene oxide S-GO; add 1 g of sodium borohydride was reacted at 60°C for 1 h to obtain sulfonated graphene 2.
Embodiment 3
[0040] The formula is shown in the table below
[0041]
[0042]
[0043] in:
[0044] Polyester diol: polyether diol=3:5=1:1.67, weight ratio;
[0045] Polyester diol: polycarbonate diol: poly 1,4-butylene adipate diol = 1:1;
[0046] Polyether diol: polytetrahydrofuran diol: polyoxypropylene diol = 1:1, weight ratio;
[0047] Chain extender: non-ionic chain extender: ionic chain extender = 1:0.7;
[0048] Preparation:
[0049] (1) Poly 1,4-butylene adipate diol, polycarbonate diol, polytetrahydrofuran diol, polyoxypropylene diol, hydroxyl silicone oil, 1,4-butanediol, anti Oxygen 1010 and antioxidant 168 were mixed, stirred, and toluene diisocyanate was added at 40°C, and reacted under vacuum at 50°C for 1.5 hours;
[0050] (2) Add 2,2-dimethylolpropionic acid, stir for 20 minutes; then add bismuth isooctanoate, react at 70°C for 3 hours, then add acetone to adjust the viscosity;
[0051] (3) Cool down to room temperature, add triethylamine, ethylenediamine and s...
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