A kind of nanomaterial dispersion liquid and preparation method thereof
A technology of nanomaterials and dispersions, applied in the field of nanomaterials dispersions and their preparation, to achieve good dispersion, low viscosity, and high material utilization
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[0029] A preparation method of nanomaterial dispersion, comprising the following steps:
[0030] S1: Sand mill, ball mill or directly disperse the micro and / or nano raw materials in a dispersant to obtain a uniformly dispersed slurry A;
[0031] S2: centrifuge the slurry A in S1 in a centrifuge to obtain a layered slurry B;
[0032] S3: Take the upper layer liquid in the slurry B in S2 to obtain a nanomaterial dispersion liquid with D50<80 nm and an average particle size smaller than the particle size of the raw material.
[0033] Preferably, the sand or ball milling time in S1 is 1-40 h; preferably, the centrifugal speed in S2 is 1000-15000 r / min, and the centrifugal time is 5-60 min.
[0034] Further, in the preparation method of the nanomaterial dispersion liquid, in terms of parts by weight, the ratio of the raw material to the dispersant in S1 is (0.1-60):100.
[0035] Further, after step S3, step S4 may also be included: collecting the lower sediment in the slurry B, r...
Embodiment 1
[0047] Mix 30 parts of lithium aluminum titanate phosphate with a particle size of D50=500nm and 100 parts of ethanol, and then ball-mill in a ball mill for 10 hours to obtain a uniformly dispersed mixed slurry A; transfer the slurry A to a high-speed centrifuge at a speed of 4000 r / min Centrifuge for 10 minutes to obtain a layered slurry B; collect the upper layer to obtain the desired nanometer lithium aluminum titanium phosphate dispersion. The centrifuged precipitate was dispersed, ball milled and centrifuged again, and the supernatant was collected until the yield of the nanomaterial dispersion was 98%. After calculation, the solid content of the nano titanium aluminum lithium phosphate dispersion liquid obtained by centrifugation is 7.2%.
[0048] The prepared nano-titanium aluminum lithium phosphate dispersion was diluted by 3 times with ethanol, dropped on the Cu mesh, dried, observed by TEM, and zoomed to the observation scale of 5 nm. It can be seen that the D50 of t...
Embodiment 2
[0052] Mix 1 part of lithium iron phosphate with a particle size of D50=150nm and 100 parts of N-methylpyrrolidone (NMP) and then ball-mill in a ball mill for 20h to obtain a uniformly dispersed slurry A; Centrifuge at a speed of / min for 15 min to obtain a layered slurry B; collect the upper layer to obtain the desired nano-lithium iron phosphate dispersion. The centrifuged precipitate was dispersed, ball-milled and centrifuged again, and the supernatant was collected until the yield of the nanomaterial dispersion reached 99%. After calculation, the solid content of the nano-lithium iron phosphate dispersion obtained by centrifugation is 10.2%.
[0053] The nano-lithium iron phosphate dispersion obtained by centrifugation was diluted 5 times with N-methylpyrrolidone (NMP), dropped on the Cu mesh, dried, observed by TEM, and enlarged to the observation scale of 30nm, and it can be seen that titanium aluminum phosphate Lithium nanoparticles have a D50 of about 70 nm.
[0054]...
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