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Aramid fiber coating liquid and preparation method thereof, diaphragm and application based on aramid fiber coating liquid

A technology of coating liquid and aramid fiber, which is applied to structural parts, electrical components, battery pack parts, etc., can solve the problems of time-consuming and power consumption

Active Publication Date: 2022-04-05
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] It takes a lot of time to dissolve the aramid fiber while making the meta-aramid slurry, and it needs continuous heating and stirring while dissolving the aramid fiber, which consumes time and electricity

Method used

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  • Aramid fiber coating liquid and preparation method thereof, diaphragm and application based on aramid fiber coating liquid
  • Aramid fiber coating liquid and preparation method thereof, diaphragm and application based on aramid fiber coating liquid
  • Aramid fiber coating liquid and preparation method thereof, diaphragm and application based on aramid fiber coating liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method for an aramid fiber coating solution, comprising the following steps:

[0037] 1) Mix ceramic particles (alumina) with dimethylacetamide (DMAc) and stir for 30 minutes. Grinding with pin-type nano sand mill for 20min to obtain the first mixture, wherein the speed of sand milling is 900r / min, and the ratio of ceramic particles to dimethylacetamide is 15:70 in parts by mass; In the test, the particle size of the ceramic particles in the first mixture is D50: 0.3 μm, D90: 1 μm.

[0038] 2) Under a nitrogen atmosphere, stir the first mixture and m-phenylenediamine for 20 minutes, after stirring, cool down to 0°C in a chilled water bath, then add isophthaloyl chloride, and stir for 20 minutes (the temperature of this process is 0°C ), remove the water bath, then heat up to 80°C, and the heating rate is 6°C / min, add calcium hydroxide, and stir for 30min (the process temperature is 80°C), to obtain the second mixture, wherein, in parts by mass, the - The...

Embodiment 2

[0041] A preparation method for an aramid fiber coating solution, comprising the following steps:

[0042] 1) Mix ceramic particles (silicon dioxide) with dimethylacetamide (DMAc) and stir for 30 minutes. The first mixture was obtained by sanding with a pin-type nano-sand mill for 20 minutes, wherein the rotational speed of the sand mill was 900r / min, and the ratio of ceramic particles to dimethylacetamide was 17:75 in parts by mass; In the test, the particle size of the ceramic particles in the first mixture is D50: 0.5 μm, D90: 1.2 μm.

[0043] 2) Under a nitrogen atmosphere, stir the first mixture and m-phenylenediamine for 20 minutes, after stirring, cool down to 2°C in a chilled water bath, then add isophthaloyl chloride, and stir for 20 minutes (the temperature of this process is 2°C ), remove the water bath, then heat up to 80°C, and the heating rate is 7°C / min, add calcium hydroxide, and stir for 30min (the process temperature is 80°C), to obtain the second mixture, w...

Embodiment 3

[0046] A preparation method for an aramid fiber coating solution, comprising the following steps:

[0047] 1) Mix ceramic particles (barium titanate) with dimethylacetamide (DMAc), and stir for 30 minutes. The first mixture was obtained by using a pin-type nano-sand mill for 20 minutes, wherein the rotational speed of the sand mill was 900r / min, and the ratio of ceramic particles to dimethylacetamide was 20:80 in parts by mass; In the test, the particle size of the ceramic particles in the first mixture is D50: 0.6 μm, D90: 1.3 μm.

[0048] 2) Under a nitrogen atmosphere, stir the first mixture and m-phenylenediamine for 20 minutes, then cool down to 5°C in a chilled water bath after stirring, then add isophthaloyl chloride, and stir for 20 minutes (the process temperature is 5°C ), remove the water bath, then heat up to 80°C, and the heating rate is 8°C / min, add calcium hydroxide, and stir for 30min (the process temperature is 80°C), to obtain the second mixture, wherein, in...

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Abstract

The invention discloses an aramid fiber coating liquid and its preparation method, a diaphragm based on the aramid fiber coating liquid and its application. The preparation method comprises the following steps: stirring ceramic particles with dimethylacetamide and sanding to obtain the first Mixture; under the atmosphere of nitrogen or inert gas, stir the first mixture with m-phenylenediamine, cool down to 0-5°C after stirring, then add isophthaloyl chloride, stir, and then heat up to 78-5°C after stirring At 90°C, add calcium hydroxide and stir to obtain the second mixture; mix and stir the second mixture with organic matter, adjust the viscosity to 280-400mpa.s, and obtain the aramid fiber coating liquid. The present invention starts from the direction of synthesis, Add what is needed for diaphragm coating during the synthesis process, save costs while shortening the pulping time and improve the safety performance of aramid diaphragms such as heat shrinkage and needle punching.

Description

technical field [0001] The invention belongs to the technical field of battery diaphragms, and in particular relates to an aramid fiber coating liquid and a preparation method thereof, a diaphragm based on the aramid fiber coating liquid and its application. Background technique [0002] It takes a lot of time to dissolve the aramid fiber while making meta-aramid slurry, and it needs continuous heating and stirring while dissolving the aramid fiber, which consumes time and electricity. [0003] In terms of the performance of the currently produced meta-aramid coating film, the MD and TD shrinkage values ​​at 130°C are ≥5%, and the acupuncture strength is ≤6N, and the production process needs at least 8 hours. [0004] Now it is necessary to invent a meta-aramid fiber coating slurry that improves the thermal shrinkage rate and saves production time. Contents of the invention [0005] Aiming at the deficiencies in the prior art, the object of the present invention is to pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/417H01M50/449
CPCH01M50/403H01M50/411H01M50/44Y02E60/10
Inventor 袁海朝徐锋李腾苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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