A kind of superhydrophilic polymer microporous membrane and its manufacturing method
A polymer and microporous membrane technology, applied in chemical instruments and methods, membranes, membrane technology, etc., can solve problems such as multi-level micro-nano structure damage, and achieve the effect of stable surface properties
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[0027] The invention provides a kind of preparation method of superhydrophilic polymer microporous membrane, it comprises the following steps:
[0028] S1, carrying out a copolymerization reaction of polyalkoxysilane and hydrophilic monomer in an organic solvent under the action of a catalyst to obtain a hydrophilic modified siloxane prepolymer solution;
[0029] S2, adding inorganic nanoparticles to the hydrophilic modified siloxane prepolymerization liquid to modify the inorganic nanoparticles to obtain an emulsion containing hydrophilic modified inorganic nanoparticles; and
[0030] S3, coating the emulsion containing the hydrophilic modified inorganic nanoparticles on the surface of the polymer microporous membrane to form a hydrophilic coating to obtain the superhydrophilic polymer microporous membrane.
[0031] In step S1, the temperature of the copolymerization reaction is 40°C to 100°C, preferably 50°C to 70°C. The time for the copolymerization reaction is 2 hours to ...
Embodiment 1
[0045] (1) Add 3g of hydroxyethyl methacrylate, 2g of vinyltrimethoxysilane and 0.06g of benzoyl peroxide to 100mL of dehydrated ethanol in turn, pass through industrial nitrogen, and 200r at room temperature / min Mechanical stirring for 20min. Then heat and gradually increase the temperature to 65° C., and react with mechanical stirring at 200 r / min for 36 hours in an industrial nitrogen atmosphere. Turn off the heating, and obtain a hydrophilic hydroxyethyl methacrylate / vinyltrimethoxysilane copolymer prepolymer liquid after fully cooling down.
[0046] (2) Add 5g of nano-zinc oxide particles to the hydrophilic hydroxyethyl methacrylate / vinyl trimethoxysilane copolymer pre-polymerization solution, and ultrasonically treat it for 20 minutes to obtain a nano-zinc oxide particle containing hydrophilic modification lotion.
[0047] (3) The emulsion containing the hydrophilic modified nano-zinc oxide particles is evenly coated on the surface of the polyvinylidene fluoride micro...
Embodiment 2
[0050] (1) Add 4g of N-vinylpyrrolidone, 3g of vinyltriethoxysilane and 0.1g of azobisisoheptylcyanide to 100mL of absolute ethanol in sequence, feed high-purity nitrogen, and Under 250r / min mechanical stirring for 30min. Then heat and gradually increase the temperature to 80° C., and react with mechanical stirring at 250 r / min for 24 hours in an industrial nitrogen atmosphere. Turn off the heating, and obtain a hydrophilic N-vinylpyrrolidone / vinyltriethoxysilane copolymer prepolymer liquid after cooling down sufficiently.
[0051] (2) Add 6 g of nano-titanium dioxide particles to the hydrophilic N-vinylpyrrolidone / vinyltriethoxysilane copolymer prepolymerization solution, and perform ultrasonic treatment for 40 minutes to obtain an emulsion containing hydrophilic modified nano-titanium dioxide particles.
[0052] (3) The emulsion containing the hydrophilic modified nano-titanium dioxide particles is evenly coated on the surface of the polyvinylidene fluoride microporous memb...
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