Preparation method of nano-porous nickel composite membrane and nano-porous nickel composite membrane
A technology of nanoporous nickel and composite membrane, which is applied in the preparation of nanoporous nickel composite membrane and the field of nanoporous nickel composite membrane. high precision effect
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[0036] A method for preparing a nanoporous nickel composite membrane provided by the embodiments of the present application includes:
[0037] S101: dispersing the nano-nickel fibers into an organic solvent to obtain a slurry;
[0038] S102: coating the slurry on the nickel porous substrate to obtain a nano-nickel fiber membrane layer;
[0039] S103 : sintering the nickel porous substrate coated with the nano-nickel fiber membrane layer to obtain a nano-porous nickel composite membrane.
[0040] The principle of the invention is as follows: using a micron-scale metal nickel porous matrix as a carrier, the carrier has good mechanical properties and processing performance; The nanoporous nickel composite membrane with grade pore size can simultaneously meet the requirements of metal filter elements for filtration and separation, such as good installation performance, high filtration accuracy, and large permeation capacity.
[0041] In specific implementation, the organic solve...
Embodiment 1
[0046] Step 1. Nano-nickel fibers prepared by electrospinning, with a diameter of 20 nm and a length of 10 μm, are dispersed into a polyvinyl alcohol aqueous solution containing 5 wt% to obtain a slurry with a solid content of 25%;
[0047] Step 2, coating the slurry obtained in step 1 on the nickel porous substrate, wherein the nickel porous substrate has a filtration precision of 10 μm, a diameter of 80 mm, a height of 500 mm, and a thickness of about 2 mm, and the thickness of the nano-nickel fiber membrane layer is 20 μm;
[0048] Step 3. Place the nano-nickel fiber membrane layer obtained in step 2 in a hydrogen furnace, and the hydrogen flow rate is 7.5×10 - 2 m 3 ·min -1 , 550 ℃, sintering for 2.5 hours to obtain nano-porous nickel composite membrane.
[0049] The over-efficiency of the nanoporous nickel composite film with a particle size of 0.3 μm or more obtained in this example is more than 99.5%, and the filtration efficiency of 0.6 μm dust is more than 99.99%. ...
Embodiment 2
[0051] Step 1. Nano-nickel fibers prepared by electrospinning, with a diameter of 50 nm and a length of 30 μm, are dispersed into an aqueous solution of polyvinyl alcohol containing 8 wt% to obtain a slurry with a solid content of 50%;
[0052] Step 2, coating the slurry obtained in step 1 on the nickel porous substrate, wherein the nickel porous substrate has a filtration precision of 5 μm, a diameter of 50 mm, a height of 500 mm, and a thickness of about 2 mm; the thickness of the nano-nickel fiber membrane layer is 80 μm;
[0053] Step 3. Place the nano-nickel fiber membrane layer obtained in step 2 in a hydrogen furnace, and the hydrogen flow rate is 2.5×10 - 2 m 3 ·min -1 , 720 ℃, sintering for 0.3 hours to obtain nano-porous nickel composite membrane.
[0054] The over-efficiency of the nanoporous nickel composite membrane with a particle size of 0.3 μm or more obtained in this example is more than 99.5%, and the filtration efficiency of 0.8 μm dust is more than 99.99...
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