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Test method of water content in slurry

A test method and technology for water content, which are applied in measuring devices, analyzing materials, and material analysis by electromagnetic means, etc., can solve the problems of slurry composition pollution, high slurry viscosity and difficult to test, and achieve the effect of simple testing process.

Inactive Publication Date: 2019-06-21
东莞维科电池有限公司
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Problems solved by technology

[0006] The object of the present invention is to provide a kind of test method of water content in slurry, described method has solved the too high slurry viscosity that traditional test method exists and is difficult to test and the problem that slurry component pollutes K-F moisture meter electrode and K-F reagent, The method utilizes the extractant to mix the slurry, and then centrifuges to test the water content of the supernatant of the mixed solution, thereby further calculating the water content of the slurry; the test method of the present invention has a simple test process and high test accuracy , when ethyl acetate is selected as the extraction agent, the error of the test result is <7%, which meets the needs of industrial production

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Embodiment 1

[0059] The recovery rate of extractant to the moisture in the slurry in the extraction process has obvious impact on the test accuracy of the method of the present invention, below is to verify the feasibility of the method of the present invention, a certain amount of pure water is added to blank ethyl acetate Among esters, test the recovery rate of ethyl acetate to water, thereby confirming that the present invention adopts ethyl acetate as the method for extraction agent is feasible, and its specific steps are as follows: the water content in the mixed solution after the present embodiment controls extraction is 330-15000 μ g / g;

[0060] (1) Take the mass as m 1 Ethyl acetate, using K-F moisture tester to test its relative water content s 1 ;

[0061] (2) Take the mass as m 2 pure water;

[0062] (3) Add the pure water in step (2) to the ethyl acetate in step (1) to obtain the mixed solution, stir it magnetically for 30 minutes, and then centrifuge it at 3000 rpm / min f...

Embodiment 2

[0074] In this embodiment, the test capability of the method of the present invention is verified by repeatedly testing the same carbon nanotube slurry. The carbon nanotube slurry used in this embodiment contains conductive carbon, NMP solvent and trace water. Specific steps are as follows:

[0075] (1) Equipment drying, put the centrifuge tubes, magnets, syringes, etc. required for the test in the oven to dry for later use;

[0076] (2) Ethyl acetate dehydration: The analytically pure ethyl acetate required for the test is dehydrated with dry molecular sieves for 48 hours until its relative water content is below 50 μg / g;

[0077] (3) Weigh about 30 g of ethyl acetate into centrifuge tube A in a drying room (dew point < -40°C), add magnets, and use it as a blank sample;

[0078] (4) In a drying room (dew point 1 ) and about 5g of carbon nanotube slurry (its actual mass is denoted as M 2 ) to the centrifuge tube B, add magnets;

[0079] (5) After sealing the centrifuge tube...

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Abstract

The present invention discloses a test method of water content in slurry. The method solves the problem that the slurry viscosity is too high to test and the problem of slurry ingredient pollution K-Fwater content tester electrodes and a K-F reagent in the traditional test method. The method provided by the invention employs an extraction agent to mix with the slurry, and performs centrifugationtest of the water content of the supernatant of the mixed solution to further calculate and obtain the water content of the slurry. The method is simple in test process and high in test accuracy, andthe errors of the test results are less than 7% when the ethyl acetate is selected as the extraction agent so as to meet the demands of industrial production.

Description

technical field [0001] The invention relates to the field of slurry preparation, in particular to a method for testing water content in slurry. Background technique [0002] In the existing lithium battery production process, the preparation of slurry and the control of slurry components are important components. Taking carbon nanotube slurry as an example, carbon nanotube slurry is an important component of positive electrode slurry. The control of water content in the stirring process is very strict, if the water content in the carbon nanotube slurry is too high, it will seriously affect the quality of the finished product of the positive electrode slurry, so it is necessary to evaluate the water content in the carbon nanotube slurry Control. The water content test method of existing carbon nanotube slurry is mainly to draw carbon nanotube slurry with a needle and directly inject it into the K-F moisture tester for direct testing. The shortcomings of this method mainly in...

Claims

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Application Information

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IPC IPC(8): G01N27/00
Inventor 屈柯何雪明陈伟峰庞佩佩刘露朱坤庆计阳楚英张涛
Owner 东莞维科电池有限公司
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