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Determination method of paraffin oil concentration in organic solvent

An organic solvent and detection method technology, applied in the field of lithium ion secondary batteries, can solve problems such as effective characterization of paraffin oil concentration, and achieve the effects of high detection work efficiency, simple equipment and wide application range

Active Publication Date: 2016-08-24
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of wet diaphragm manufacturing, the extraction tank is a mixture of paraffin oil and organic solvents, and because the organic compounds in paraffin oil are not easy to react with other substances, traditional concentration determination methods, such as titration and gravimetric methods, cannot Efficient characterization of paraffinic oil concentrations in organic solvents
At present, there is no effective method to determine the concentration of paraffin oil in organic solvents

Method used

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  • Determination method of paraffin oil concentration in organic solvent
  • Determination method of paraffin oil concentration in organic solvent
  • Determination method of paraffin oil concentration in organic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for testing the concentration of paraffin oil in an organic mixed solution. In this embodiment, dichloromethane with a boiling point of 39.8° C. is selected as the organic solvent, and the specification of the quartz cuvette is 1 mm optical path. The specific operation steps are as follows:

[0049] 1. Determination of the maximum ultraviolet absorption band of paraffin oil

[0050] a) Take 25 mL of pure paraffin oil sample and 25 mL of n-hexane and mix them in a separatory funnel, and add 5 mL of dimethyl sulfoxide. Vigorously shake the mixed solution for 1 min to make it fully mixed, and let it stand until the lower solution is transparent;

[0051] b) Suck the transparent lower layer solution into another separatory funnel, add 2 mL of n-hexane, shake vigorously, and let stand until the lower layer solution becomes transparent. Inhale the lower layer solution into a 1cm absorption cell, and mark it as "sample extract";

[0052] c) Put 25mL of n-hexane into...

Embodiment 2

[0073] On the basis of Example 1, using heptane with a boiling point of 98.42°C as the organic solvent, the absorbance of the sample was tested in the same way, and the test results are as follows:

[0074] A) paraffin oil scanning maximum absorption band place wavelength is 265.9nm with embodiment 1;

[0075] b) Standard curve data and curve, as shown in Table 4:

[0076] Table 4 standard sample concentration-absorbance data

[0077] Standard No.

Standard sample mass concentration (%)

Absorbance

1

1

0.088

2

4

0.246

3

7

0.395

4

10

0.527

5

13

0.677

[0078] image 3 It is the standard sample concentration-absorbance curve of embodiment 2;

[0079] c) same sample test data, as shown in Table 5:

[0080] Table 5 Repeated test data of the same sample

[0081]

[0082]

[0083] d) Test data of different samples, as shown in Table 6:

[0084] Table 6 UV test data of different samples

[...

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Abstract

The invention discloses a method for detecting the concentration of paraffin oil in an organic solvent, which comprises the following steps: 100. Scanning the absorption spectrum of pure paraffin oil in the near-ultraviolet region of 200nm-400nm to determine the maximum ultraviolet absorption wavelength; 200. Distributing the concentration evenly In 0.1%-20% paraffin oil-organic solvent standard sample; 300. Using pure organic solvent as a reference solvent, scan and measure the absorbance of the standard sample at the maximum absorption wavelength of paraffin oil; 400. Draw a standard curve of different concentrations-absorbance; 500. Test the absorbance of the sample under the same conditions; 600. Use the absorbance of the sample to correspond to the standard curve to obtain the concentration of the sample. The composite diaphragm prepared by the invention has the advantages of being able to quickly and conveniently and accurately test the concentration of paraffin oil in an organic solvent.

Description

technical field [0001] The invention relates to a lithium-ion secondary battery, in particular to a method for detecting the concentration of paraffin oil in an organic solvent that can quickly, conveniently and accurately test the concentration of the paraffin oil in the organic solvent. Background technique [0002] In recent years, with the rapid development of lithium-ion batteries, it has also driven the development of the upstream diaphragm industry. From the manufacturing process of lithium-ion battery diaphragm, the manufacturing process of diaphragm is divided into two categories: "dry method" and "wet method". The "dry method" manufacturing process is to use polyolefin raw materials to be melt-extruded, cast, and stretched to form holes; the "wet" manufacturing process is to use polyethylene-paraffin oil mixed melt extrusion, casting, and stretching Boiling organic solvents extract paraffin oil into pores. [0003] In the manufacturing process of wet membrane, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33
Inventor 秦银银陈秀峰陈良
Owner SHENZHEN SENIOR TECH MATERIAL