A preparation method of hydrophobic nano calcium carbonate filled polyurethane pervaporation membrane
A technology of pervaporation membrane and nano calcium carbonate, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology and other directions, can solve the complex membrane preparation process, film formation, poor mechanical properties, poor selectivity, etc. problem, to achieve the effects of excellent mechanical strength, good hydrophobic surface, and simple preparation process
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Embodiment 1
[0014] (1) Preparation of hydrophobic nano-calcium carbonate: Weigh 10g of dried nano-calcium carbonate, add 100g of deionized water, stir at 80°C to disperse evenly, then add 0.5g of oleic acid, stir at 80°C for 4h, filter, Finally, wash the nano-calcium carbonate repeatedly with the solvent n-hexane to remove excess oleic acid, dry it in a vacuum oven at 80°C, and obtain hydrophobic nano-calcium carbonate after grinding;
[0015] (2) Preparation of casting solution: Add xylene as a solvent in a reactor equipped with nitrogen protection, mechanical stirring and condensing reflux, and mix hydroxyl-terminated polybutadiene and toluene-2,4-diisocyanate into a mixture, Dissolve in xylene solvent, add catalyst dibutyltin dilaurate, stir evenly, react at 60°C for 3 hours, cool to room temperature, synthesize prepolymer, add hydrophobic nano-calcium carbonate, and add diphenylmethane drop by drop Diamine, heated up to 50° C. and stirred for 1 h to obtain a casting solution; the aver...
Embodiment 2
[0019] (1) Preparation of hydrophobic nano-calcium carbonate: Weigh 10g of dried nano-calcium carbonate, add 100g of deionized water, stir at 80°C to disperse evenly, then add 0.8g of stearic acid, stir at 80°C for 8h, filter , and then repeatedly wash the nano-calcium carbonate with solvent n-hexane to remove excess stearic acid, place it in a vacuum oven at 80°C for drying, and grind to obtain hydrophobic nano-calcium carbonate;
[0020] (2) Preparation of casting solution: Add xylene as a solvent in a reactor equipped with nitrogen protection, mechanical stirring and condensing reflux, and mix hydroxyl-terminated polybutadiene and toluene-2,4-diisocyanate into a mixture, Dissolve in xylene solvent, add catalyst dibutyltin dilaurate, stir evenly, react at 70°C for 1 hour, cool to room temperature, synthesize prepolymer, add hydrophobic nano-calcium carbonate, and add diphenylmethane drop by drop Diamine, heated up to 50° C. and stirred for 1 h to obtain a casting solution; t...
Embodiment 3
[0024] (1) Preparation of hydrophobic nano-calcium carbonate: Weigh 10g of dried nano-calcium carbonate, add 100g of deionized water, stir at 80°C to disperse evenly, then add 0.5g of oleic acid, stir at 80°C for 4h, filter, Finally, wash the nano-calcium carbonate repeatedly with the solvent n-hexane to remove excess oleic acid, dry it in a vacuum oven at 80°C, and obtain hydrophobic nano-calcium carbonate after grinding;
[0025](2) Preparation of casting solution: Add xylene as a solvent in a reactor equipped with nitrogen protection, mechanical stirring and condensing reflux, and mix hydroxyl-terminated polybutadiene and toluene-2,4-diisocyanate into a mixture, Dissolve in xylene solvent, add catalyst dibutyltin dilaurate, stir evenly, react at 70°C for 2 hours, cool to room temperature, synthesize prepolymer, add hydrophobic nano-calcium carbonate, and add diphenylmethane drop by drop Diamine, heated up to 50° C. and stirred for 1 h to obtain a casting solution; the avera...
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