- A phosphite antioxidant preparation method
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The invention discloses a method for preparing a phosphite antioxidant. The method comprises the following steps: 1) preparing an organo-magnesium compound solution, namely adding magnesium chips to a reactor, introducing protective atmosphere into the reactor, adding an iodine substance until the reactor is full of iodine vapor, dropwise adding a 4,4-dibromobiphenyl solution to the reactor, heating and refluxing, dropwise adding an organic solvent to the reaction system to clarify after dropwise adding, reacting for 2-6 hours under a reflux state and cooling; 2) dropwise adding the organo-magnesium compound solution to the bi(2,4-di-tert-butylphenyl) chlorophosphite solution at -15 to 20 DEG C, carrying out heat preservation at -10 to 50 DEG C for 1-5 hours after dropwise adding, filtering, washing, merging filtrate and filtering to obtain magnesium salt solid and filtrate, removing the solvent in the filtrate, so as to obtain wet white powder, then recrystallizing by using isopropanol, and drying the powder. The method is mild in process, simple and convenient to operate, high in catalyst selectivity, high in product yield, green and environment-friendly, and the solvent used in reaction can be recovered.
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Paragraph 0029-0032
(2017/06/20)
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- A new route to aryl-phosphonites and arylen-bis-phosphonites - stabilizers for plastics
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Aryl-phosphonites and arylen-bis-phosphonites are synthesized by a new grignard route.These compounds are useful as stabilizers for plastics.
- Boehshar, Manfred,Kleiner, Hanss-Jerg,Pfahler, Gerhard,Regnat, Dieter
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