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Method for testing acid value content of perfluoropolyether

A technology of perfluoropolyether and testing method, which is applied in the field of analytical chemistry, can solve the problems of low end point recognition sensitivity, inaccurate test results, insufficient reaction, etc., achieve excellent results, avoid discoloration delay, and be easy to operate

Inactive Publication Date: 2020-12-18
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, provide a method for testing the acid value content of perfluoropolyether, and solve the problem of inaccurate test results caused by insufficient reaction and low sensitivity of end point recognition Compared with manual titration and direct titration, this method has high sensitivity and good accuracy, and can accurately determine the acid value in perfluoropolyether

Method used

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  • Method for testing acid value content of perfluoropolyether
  • Method for testing acid value content of perfluoropolyether
  • Method for testing acid value content of perfluoropolyether

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0029] (1) Weigh 1 g of the sample 1 to be tested with an estimated acid value of 0.5 mgKOH / g in a beaker.

[0030] (2) Add 30 mL of an aqueous sodium acetate solution with a concentration of 0.005 mol / L into the beaker of step (1), and fully stir and react at 40° C. for 2 h.

[0031] (3) Titrate the above solution with 0.005 mol / L potassium hydroxide ethanol solution, react until the potential jumps, and the instrument recognizes the end point to automatically record the volume of consumed potassium hydroxide ethanol solution.

[0032] (4) Before the sample test, test the volume of the potassium hydroxide ethanol solution consumed by the blank under the same conditions, and input it into the formula of the potentiometric titrator.

[0033] (5) The instrument automatically calculates the acid value of the sample according to the formula.

[0034] (6) Repeat three times to get the average value.

Embodiment 2

[0036] The concentration of the potassium hydroxide ethanol solution in the embodiment 1 is changed to 0.01mol / L, and other operations are the same as in the embodiment 1.

Embodiment 3

[0038] The potassium hydroxide ethanol solution in embodiment 1 is replaced by potassium hydroxide isopropanol solution, and other operations are the same as embodiment 1.

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Abstract

The invention belongs to the technical field of analytical chemistry, and particularly relates to a method for testing the acid value content of perfluoropolyether, and the method comprises the following steps: testing the acid value of perfluoropolyether by indirect titration, completely reacting excessive sodium acetate with acidic groups in perfluoropolyether to generate acetic acid, titratingthe generated acetic acid by using a potassium hydroxide alcohol solution, and automatically performing calculating to obtain the content of the acidic substance in the perfluoropolyether by the instrument according to an input formula through the dosage of potassium hydroxide. The method provided by the invention has the advantages of high sensitivity and good accuracy, can accurately determine the acid value content of perfluoropolyether, and solves the problem of inaccurate test result caused by insufficient reaction and low endpoint identification sensitivity.

Description

technical field [0001] The invention belongs to the technical field of analytical chemistry, and in particular relates to a method for testing the acid value content of perfluoropolyether. Background technique [0002] In recent years, with the continuous development and progress of science and technology, the preparation of perfluoropolyether has attracted the attention of all countries in the world, and the preparation process and testing methods have also become pivotal. Perfluoropolyether (PFPE, English name Perfluom Polyethers) is a compound that began to be studied in the 1960s. It is a special kind of perfluoropolymer compound. There are three elements of C, F and O, which have the characteristics of heat resistance, oxidation resistance, radiation resistance, corrosion resistance and non-combustibility, and are used as extremely reliable lubricants in cutting-edge fields such as military, aerospace, nuclear, chemical and automotive industries. agent has a history of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/16
Inventor 郭寒雨宋增红张坚韩欣颐刘体健
Owner SHANDONG DONGYUE POLYMER MATERIAL