Title:
PERFLUOROPOLYETHER AND PREPARATION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/024287
Kind Code:
A1
Abstract:
A method for preparing a highly stable and chemically resistant perfluoropolyether (PFPE) based on hexafluoropropylene (HFP) and oxygen as raw materials thereof. Fluorine is used as a chemical initiator, and hexafluoropropylene is copolymerized with oxygen to synthesize a PFPE with an average molecular weight of more than 1500. In the synthesis stage, the HFP and the oxygen are subjected to low-temperature oxypolymerization at -75°C to -40°C in the presence of the initiator, and then the peroxide group in the resulting PFPE peroxide is eliminated at 160-300°C, wherein the molar ratio of the HFP to the initiator is not lower than 25, the mass ratio of active oxygen (PO) in the peroxide in the resulting polyether to the whole PFPE is not higher than 0.015, a reactor filling material is a metal in Group VIII of the periodic table, and the PFPE obtained after peroxide elimination is subjected to terminal group treatment with fluorine gas at 120-260°C to remove a terminal acyl fluoride group.
Inventors:
WU QING (CN)
LI HONGFENG (CN)
WANG SHUHUA (CN)
KAERNILUOFU WAJIMU (CN)
SUN MINGSHAN (CN)
LI HONGFENG (CN)
WANG SHUHUA (CN)
KAERNILUOFU WAJIMU (CN)
SUN MINGSHAN (CN)
Application Number:
PCT/CN2017/108606
Publication Date:
February 07, 2019
Filing Date:
October 31, 2017
Export Citation:
Assignee:
WU QING (CN)
International Classes:
C08G65/00; C08F214/28; C08G65/02
Foreign References:
| US3665041A | 1972-05-23 | |||
| RU2046127C1 | 1995-10-20 | |||
| CN103788363A | 2014-05-14 | |||
| US3704214A | 1972-11-28 |
Attorney, Agent or Firm:
HANGZHOU HUI & LIANG INTELLECTUAL PROPERTY CO., LTD (CN)
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