Concentrated fluoropolymer dispersion and method for preparing fluoropolymer

A technology of polymer dispersion polymerization, which is applied in the field of synthesis of fluoropolymers, can solve the problems of color change of fluoropolymers, and achieve the effect of low cost and easy availability of raw materials

Active Publication Date: 2020-03-03
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 evacuating and replacing, add 4.3L deionized water to 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 to heat the device to 95° C., and then 130 g of TFE was added to raise the system pressure to 3.5 MPa, and 5 ml of 2.5% potassium persulfate solution was added. The polymerization reaction starts, and potassium persulfate solution is added at a rate of 0.533 ml / min during the process, and the reaction temperature is kept controlled at 95-100° C. During the reaction, no TFE was added to maintain the device pressure at 3.5Mpa. After 2.5 hours the reaction was complete. The cumulative TFE addition is 102g.

[0069] After evacuation and replacement, after cooling, the surface tension of the test emulsion is 63 dynes (test method is ASTM D1331). Take 100ml of the emulsion and dry it in an oven at 200°C for 24 hours to obtain 0...

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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