Perfluoropolyether and preparation method thereof

A perfluoropolyether and perfluoropolyether peroxide technology, which is applied in the field of perfluoropolyether preparation, can solve the problems of large losses of olefins, threats to safety processes, and complicated processes, and achieve huge economic benefits and Social benefits, low risk of explosion, and simple installation

Inactive Publication Date: 2017-12-22
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when elemental fluorine is used in the process, the oxygen content of the peroxide is not lower than 0.5%, which poses a greater threat to the safety process
The use of other initiators complicates the process due to the addition of a complex initiator synthesis stage, in addition to which it was found in all described examples that: 1. Separated inputs of initiator and oxygen complicate plant construction; 2. Reactions Continuous input of nitrogen is required in the reactor, which also complicates the device and leads to a large loss of olefins in the reaction zone

Method used

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  • Perfluoropolyether and preparation method thereof
  • Perfluoropolyether and preparation method thereof
  • Perfluoropolyether and preparation method thereof

Examples

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Embodiment 1

[0049] (1) Synthesis of perfluoropolyether peroxide:

[0050] 570g of liquid hexafluoropropylene is concentrated in a 1.0L reactor equipped with a mixer / stirrer. The mixture of oxygen and initiator is continuously fed into the reactor, and the reaction temperature is -67°C. The delivery rate of hexafluoropropylene is 11.42L / h, the rate of initiator fluorine is 0.12L / h, and the rate of oxygen is 11.84L / h. The temperature of the reactor is maintained at -67°C, and the reaction material containing the target product flows out of the reactor into the hot receiver. When the temperature of the receiver is 20-70°C, the reaction material is separated into hexafluoropropylene and acyl fluoride. The polyether of the group, the separated hexafluoropropylene is recovered and sent to the reactor again (and the obtained polyether product of the acyl fluoride group is directly put into the collector), reacted for 3 hours, and obtained containing active oxygen (PO) of 0.31 % Of 372g product.

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Abstract

The invention discloses a preparation method of perfluoropolyether (PFPE), which is high in stability and is chemical-resistant, with hexafluoropropylene (HFP) and O2 as raw materials, wherein fluorine gas is used as a chemical initiator. The HFP is copolymerized with O2 to synthesize the PFPE being more than 1500 in average molecular weight. In the synthesis stage, the HFP and the O2 are subjected to low-temperature oxidizing polymerization at -75 to -40 DEG C in the presence of the initiator; then a perfluoropolyether peroxide is treated at 160-300 DEG C to remove the peroxide group. The molar ratio of the HFP to the initiator is not less than 25. The mass ratio of reactive oxygen (PO) in the peroxide in polyether to the whole PFPE is not more than 0.015. A filling material of a reactor is metal from the VIII-group in the periodic table of elements. After elimination of the peroxide, the PFPE is subjected to terminal group treatment in fluorine gas at 120-260 DEG C to remove the terminal acylfluoride groups.

Description

Technical field [0001] The invention relates to a method for preparing perfluoropolyether (PFPE) with high stability and chemical resistance based on hexafluoropropylene (HFP) and oxygen as raw materials. Background technique [0002] Perfluoropolyether based on hexafluoropropylene is a perfluorinated oligomer with the general formula: [0003] [0004] R f And R f ’Can be CF 3 -,CF 3 CF 2 -Group [0005] Among them, fluorocarbon and oxygen atoms are alternately connected. These oligomers have a large boiling point range, from 50-70°C to 240-350°C under the condition of 1mmHg, and the melting point is -60°C or lower. [0006] At the same time, perfluoropolyether has complex and unique properties. How high thermal stability (450℃), chemical stability in highly corrosive media, fireproof, non-toxic, high dielectric properties, viscosity performance slightly in a large temperature range Variable, good lubrication performance, radiation resistance, etc. The above-mentioned complex prope...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/00
CPCC08G65/007C08G2650/24C08G2650/48
Inventor 吴庆李宏峰王树华瓦吉姆·卡尔尼洛夫孙明山
Owner JUHUA GROUP TECH CENT
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