Preparation method and application of polyolefin/nanocrystal cellulose composite diaphragm
A technology of nanocrystals and composite diaphragms, applied in the direction of separators/films/diaphragms/spacers, electrical components, circuits, etc., can solve the complex phase inversion method, the composite strength of the diaphragm, the inorganic coating is easy to fall off, and cannot meet the needs of lithium batteries. To achieve the effect of improving puncture strength and tensile strength, ensuring ionic conductivity, and improving hydrophilicity
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[0036] A preparation method of a polyolefin / nanocrystalline cellulose composite membrane, comprising the following steps:
[0037] (1) Base film pretreatment
[0038] Taking polyolefin microporous membrane as the base membrane, soaking the base membrane in an aqueous solution of catechol derivatives, introducing active groups on the surface and micropores of the base membrane, and then washing away the attachments on the surface of the membrane with distilled water, and drying it naturally. A modified porous membrane was obtained;
[0039] (2) Coating treatment of modified porous membrane
[0040] First, the modified porous membrane is immersed in the polyelectrolyte aqueous solution, soaked, taken out and then soaked with deionized water, then immersed in the nanocrystalline cellulose sodium dispersion, soaked, taken out and soaked with deionized water, so that the modified porous membrane is immersed in deionized water. A coating is formed on the surface of the membrane; t...
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[0065] Example 3:
[0066] A preparation method of a polyolefin / nanocrystalline cellulose composite membrane, comprising the following steps:
[0067] 1) Preparation of nanocrystalline cellulose: Take 10g of microcrystalline cellulose and place it in a 250mL beaker, slowly add 120mL of sulfuric acid with a concentration of 64%, heat to 45°C, stir and react for 30min, and dilute with 10 times the amount of deionized water. The reaction solution is to terminate the hydrolysis reaction; then the suspension in the reaction solution is transferred to a centrifuge tube, and centrifuged at 6000 rpm for 10 min to obtain a supernatant and a precipitate; remove the supernatant; wash the precipitate with deionized water, and then The suspension produced by washing is transferred to a centrifuge tube for centrifugation; the washing and centrifugation steps are repeated 4 times to obtain a washed solution with a pH of 2; the washed solution with a pH of 2 is then put into a dialysis bag, a...
Example Embodiment
[0072] Example 4:
[0073] A preparation method of a polyolefin / nanocrystalline cellulose composite membrane, comprising the following steps:
[0074]1) Preparation of nanocrystalline cellulose: Take 10 g of microcrystalline cellulose and place it in a 250 mL beaker, slowly add 120 mL of sulfuric acid with a concentration of 64%, heat to 30 ° C, stir and react for 20 min, and dilute with 10 times the amount of deionized water. The reaction solution is to terminate the hydrolysis reaction; then the suspension in the reaction solution is transferred to a centrifuge tube, and centrifuged at 6000 rpm for 10 min to obtain a supernatant and a precipitate; remove the supernatant; wash the precipitate with deionized water, and then Transfer the suspension produced by washing to a centrifuge tube for centrifugation; repeat the washing and centrifugation steps 3 times to obtain a washed solution with pH 1; then put the washed solution with pH 1 into a dialysis bag, and dialyze with deio...
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