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Fluorine containing polymer concentrated dispersion liquid and method for preparing fluorine containing polymer from fluorine containing polymer concentrated dispersion liquid

A technology for polymerizing dispersants and polymers, applied in the field of fluoropolymer synthesis, can solve problems such as color change of fluoropolymers, and achieve the effects of low cost and easy availability of raw materials

Active Publication Date: 2016-11-16
ZHEJIANG XINGTENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such surfactants will cause color changes of fluoropolymers due to decomposition and carbonization during heat treatment during the subsequent processing of polymers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2

[0068] Using the device described in Example 1, after evacuation and replacement, add 4.3 L of deionized water and add CF 3 CF 2 CF 2 CF 2 CF 2 CF 2 CH 2 COOH 6.8g and 20g 25%w ammonia water. 520 g of HFP was added using a pump. The temperature was raised, the device was heated to 95° C., 130 g of TFE was added, the system pressure was raised to 3.5 MPa, and 5 ml of 2.5% potassium persulfate solution was added. The polymerization reaction started, and potassium persulfate solution was added at a rate of 0.533 ml / min during the process, and the reaction temperature was maintained at 95-100°C. During the reaction, the pressure of the device was maintained at 3.5Mpa without adding TFE. The reaction ended after 2.5 hours. The cumulative amount of TFE added was 102 g.

[0069] After being evacuated and cooled, the surface tension of the tested emulsion is 63 dynes (the test method is ASTMD1331). 100 ml of the emulsion was taken and dried in an oven at 200°C for 24 hours ...

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Abstract

The invention discloses fluorine containing polymer concentrated dispersion liquid and a method for preparing a fluorine containing polymer from the fluorine containing polymer concentrated dispersion liquid. A surfactant with the molecular structural formula being CF3{(CF2)nC(CF3)2CH2}mCOOH is used as a polymerization dispersant to prepare the fluorine containing polymer, wherein n is an integer ranging from 0 to 4, and m is an integer ranging from 1 to 2. The fluorine containing polymer concentrated dispersion liquid can be used for the process of producing the fluorine polymer through a water-phase dispersion polymerization process, and the uncontrollable molecular weight caused by a surfactant chain transfer reaction is avoided when the fluorine containing polymer concentrated dispersion liquid is especially used for TFE, TFE / HFP, TFE / PPVE and TFE / ethylene polymerization reactions; the surfactant can be used as a substitute for PFOA or one of substitute components and used for water-phase dispersion polymerization of the fluorine containing polymer, and no gel is formed by polymerized emulsion.

Description

technical field [0001] The invention relates to the field of synthesis of fluoropolymers, in particular to the stability requirements of surfactants in the process of preparing PTFE, FEP, PFA, TFE / HFP / PAVE copolymers, and the requirements for molecular weight control of fluoropolymer resins and Color requirements. Background technique [0002] Perfluorooctanoic acid is a surfactant for the production of fluoropolymers by aqueous dispersion polymerization. Perfluorooctanoic acid has stable molecular structure and excellent surface properties, followed by strong thermal stability and kinetic stability. Therefore, perfluorooctanoic acid is considered to be persistent, bioaccumulative and toxic, and is a suspected human carcinogen. In 2006, the EPA issued a restriction decree, considering that perfluorooctanoic acid ammonium (PFOA) and some chemicals that can be decomposed to form PFOA are very likely to cause major diseases such as cancer because of their high stability and re...

Claims

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Application Information

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IPC IPC(8): C08F14/18C08F2/24C08F14/26
CPCC08F2/24C08F14/18C08F14/26
Inventor 赵景平余锋黄邦力洪海江龚元庞金鑫张璐
Owner ZHEJIANG XINGTENG CHEM
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