Method for determining content of peroxide in perfluoropolyether
A perfluoropolyether and peroxide technology, applied in the field of analytical chemistry, can solve problems such as the inability to use perfluoropolyether peroxide content determination, and achieve excellent results, high accuracy and simple operation.
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Embodiment 1
[0044] A method for determining the peroxide content in perfluoropolyether, the peroxygen content is estimated to be >0.1g / 100g oil, the steps are as follows:
[0045] (1) Treat pentafluorobutane, glacial acetic acid, and distilled water of about 500 mL each with nitrogen gas for 1 h before use;
[0046] (2) Accurately weigh about 0.1g of the sample to be tested (three parts each of perfluoropolyether A, perfluoropolyether B, and perfluoropolyether C) into a 125mL conical flask, add 20mL of pentafluorobutane, Shake well after corking the bottle until completely dissolved;
[0047] (3) Add 20 mL of glacial acetic acid to the solution described in step (2), shake gently, and pass nitrogen gas into the Erlenmeyer flask for about 1 min, and tightly stopper the bottle;
[0048] (4) 200mg C 3 f 7 OC 2 f 4 OCF 2 COONa is added in the solution described in step (3), shaken gently;
[0049] (5) Add 4 mL of saturated potassium iodide solution to the mixed solution described in step...
Embodiment 2
[0065] A method for determining the peroxide content in perfluoropolyether, the peroxygen content is estimated to be >0.1g / 100g oil, the steps are as follows:
[0066] (1) Each of about 500mL trifluorotrichloroethane, glacial acetic acid and distilled water was treated with nitrogen gas for 1 hour before use;
[0067] (2) Accurately weigh about 0.1g of the sample to be tested (perfluoropolyether D, perfluoropolyether E, perfluoropolyether F three parts each) in a 125mL conical flask, add 15mL trifluorotrichloroethylene alkanes, cork tightly and shake until completely dissolved;
[0068] (3) Add 20 mL of glacial acetic acid to the solution described in step (2), shake gently, and pass nitrogen gas into the Erlenmeyer flask for about 1 min, and tightly stopper the bottle;
[0069] (4) Add 50 mg of hexafluoropropylene oxide trimer ammonium chloride to the solution described in step (3), and shake gently;
[0070] (5) Add 2 mL of saturated potassium iodide solution to the mixed ...
Embodiment 3
[0086] A method for determining the peroxide content in perfluoropolyether, the peroxygen content is estimated to be less than 0.005g / 100g oil, the steps are as follows:
[0087] (1) Treat trifluorotrichloroethane, glacial acetic acid, and distilled water with about 300 mL each in nitrogen gas for 30 minutes before use;
[0088] (2) Accurately weigh about 0.5g of the sample to be tested (three parts each of perfluoropolyether G, perfluoropolyether H, and perfluoropolyether I) into a 125mL conical flask, add 10mL of trifluorotrichloroethylene alkanes, cork tightly and shake until completely dissolved;
[0089] (3) 10 mL of glacial acetic acid is added to the solution described in step (2), and nitrogen gas is passed to the Erlenmeyer flask for about 1 min, and the bottle stopper is tightened;
[0090] (4) 10mg C 7 f 15 (CH 2 ) 3 N + (CH 3 ) 3 Br - Add to the solution described in step (3), and shake gently.
[0091] (5) Add 1 mL of saturated potassium iodide solution ...
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