High-liquid-absorptivity diatomite-PVA coated diaphragm and preparation method thereof
A technology of high liquid absorption and diatomite, which is applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of easy shrinkage of batteries due to heat generation, short-circuit explosion, and low liquid absorption of diaphragms, etc., and achieve uniform particle size and stability , The effect of increasing the liquid absorption
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[0034] The raw materials for preparing the coated separator provided by the present invention include 40-60 parts by mass of diatomite, preferably 40, 45, 50, 55, 60 or any value between 50-60 parts by mass.
[0035] Diatomaceous earth is a biological mineral material formed by the sedimentation and mineralization of single-celled low-level aquatic plant diatoms and other microorganisms over millions of years. It has a natural and orderly porous structure. The chemical composition is amorphous SiO 2 Mainly, the particle size is very small, ranging from a few microns to tens of microns, and the shapes are different, most of which are disc-shaped. In the present invention, the particle size D50 of the diatomite is between 10 and 20 μm, and coating this substance on the surface of the base film can directly increase its porosity;
[0036] In the invention, the three-dimensional porous material is coated on the surface of the polyolefin diaphragm to increase the porosity of the d...
Embodiment 1
[0061] Preparation of slurry:
[0062] 1. Weigh 40 kg of diatomaceous earth and add it to a double planetary mixer; see figure 1 , figure 1 It is the electron micrograph of diatomite raw material.
[0063] 2. Weigh 8.5 kg of anti-settling agent and add it to a double planetary mixer. The anti-settling agent in this embodiment is sodium carboxymethyl cellulose with a solid content of 1.5% and a viscosity of 3000mpa.s;
[0064] 3. Weigh 6.1 kg of PVA, add it into a double planetary mixer, the PVA solid content is 10%, and the viscosity is 6000mpa.s;
[0065] 4. Turn on the double planetary mixer, the speed is 500rpm, and the time is 60 minutes;
[0066] 5. Weigh 44.4 kg of pure water and add it to a double planetary mixer at a speed of 500 rpm for 30 minutes;
[0067] 6. Weigh 1 kg of wetting agent alkylphenol polyoxyethylene ether, add it to a double planetary mixer, rotate at 500 rpm, and take 60 minutes to obtain a finished slurry with a solid content of 40%, a viscosity ...
Embodiment 2
[0073] Preparation of slurry:
[0074] 1. Weigh 50 kg of diatomaceous earth and add it to a double planetary mixer;
[0075] 2. Weigh 8.5 kg of anti-settling agent and add it to a double planetary mixer. The anti-settling agent of this patent is sodium carboxymethyl cellulose with a solid content of 1.5% and a viscosity of 3000mpa.s;
[0076] 3. Weigh 6.1 kg of PVA, add it into a double planetary mixer, the PVA solid content is 10%, and the viscosity is 6000mpa.s;
[0077] 4. Turn on the double planetary mixer, the speed is 500RPM, and the time is 60 minutes;
[0078] 5. Weigh 34.4 kg of pure water and add it to a double planetary mixer at a speed of 500 RPM for 30 minutes;
[0079] 6. Weigh 1 kg of wetting agent alkylphenol polyoxyethylene ether, add double planetary mixer, rotate speed 500RPM, time 60 minutes, obtain finished slurry, the solid content of the slurry obtained is 50%, viscosity 178mpa.s, particle size D50 is 14.1 μm.
[0080] Membrane coating:
[0081] In ...
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