Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com