Method for preparing fluorine-containing polymer by using mixed fluorine-containing surfactant

A surfactant and polymer technology, applied in the field of fluorine-containing polymer preparation, can solve problems such as poor system stability and small primary particles

Active Publication Date: 2013-07-17
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, polytetrafluoroethylene obtained by using perfluorohexanoic acid has small primary particles and poor system stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A method for preparing fluorine-containing polymer by dispersion method is to add 5.8 kg of deionized water, 0.11 kg of paraffin, 0.13 g of ammonia, and 2.5 g of succinic acid to a polymerization kettle with a propeller stirrer and 10 L. Add 0.01 kg of perfluorohexanoic acid and 1 mg of compound I with an average molecular weight of 1532. Cover the lid of the polymerization vessel, evacuate the vessel and remove oxygen until the oxygen content is ≤10ppm, then add tetrafluoroethylene to 2.1MPa, and the stirring speed is 245rpm constant. When the temperature of the polymerization vessel reaches 85°C, add 1.1g of ammonium persulfate, Start the polymerization reaction. During the polymerization reaction, the temperature was kept at 85°C, and tetrafluoroethylene was continued to be introduced to keep the kettle pressure at 2.1MPa. After 5 hours, the feed was stopped, and a total of 1.40kg of tetrafluoroethylene was introduced. After recovery and replacement, the reacted mater...

Embodiment 2

[0071] A method for preparing fluorine-containing polymer by dispersion method is to add 5.6 kg of deionized water, 0.22 kg of paraffin, 0.24 g of ammonia, and 3.7 g of succinic acid in a polymerization kettle with a propeller stirrer and 10 L. Add 0.04 kg perfluoroheptanoic acid and 0.08 mg of compound I with an average molecular weight of 2486. Cover the lid of the polymerization kettle, evacuate the kettle and remove oxygen until the oxygen content is ≤10ppm, then add tetrafluoroethylene and hexafluoropropylene (mass ratio 20:1) to 2.8MPa, and the stirring speed is 265rpm. When the temperature of the polymerizer reaches 91℃, add 0.48kg potassium persulfate to start the polymerization reaction. During the polymerization reaction, keep the temperature at 91℃, continue to feed tetrafluoroethylene and hexafluoropropylene to keep the pressure at 2.8MPa for 11 hours After that, the feed was stopped, and a total of 1.33 kg of tetrafluoroethylene and 0.07 kg of hexafluoropropylene w...

Embodiment 3

[0074] A method for preparing fluoropolymer by dispersion method. In a polymerization kettle with a propeller stirrer and 10L, 5.3kg of deionized water, 0.17kg of paraffin, 0.20g of ammonia, and 0.013kg of CF3-CF2-O- CF2-CF2-O-CF2-COOH and 0.5 g of compound I with an average molecular weight of 3848. Cover the polymerization vessel lid, evacuate the vessel and remove oxygen until the oxygen content is ≤10ppm, then add vinylidene fluoride to 3.2MPa, and the stirring speed is constant at 280rpm. When the temperature of the polymerization vessel reaches 90℃, add diisopropyl peroxide Dicarbonate 2.3g, start the polymerization reaction, during the polymerization process, keep the temperature at 90℃, continue to feed vinylidene fluoride to keep the kettle pressure at 3.2MPa, stop feeding after 7 hours, and feed a total of 1.35kg vinylidene fluoride. After recovery and replacement, the reacted materials are coagulated, washed, and dried to obtain 1.12 kg of PVDF resin.

[0075] Test re...

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Abstract

The invention relates to a method for preparing a fluorine-containing polymer by using a mixed fluorine-containing surfactant. The method comprises the following steps of: performing homopolymerization or copolymerization by using a fluorine-containing olefin monomer or performing copolymerization on the fluorine-containing olefin monomer and the fluorine-fee olefin monomer under the effect of an initiator; adding 0.01-1% of mixed fluorine-containing surfactant to the reaction system, wherein the fluorine-containing surfactant is combined by a molecular weight fluorine-containing surfactant [Rf-(O)m-Rf'-COO]nAn+ and high molecular fluorine-containing surfactant [CF2=CF-(O)p-Rf1-(O)q-Rf2-COO]nAn+ containing unsaturated bonds. Without perfluoro caprylic acid as a dispersant, the method is high in safety and easy to control polymerization conditions, so that the environmental pollution by perfluoro caprylic acid is avoided, and the product system is good in stability and uniform in grain shape.

Description

Technical field [0001] The invention relates to a method for preparing a fluoropolymer by a dispersion method, in particular to a method for preparing a fluoropolymer by using a mixed fluorosurfactant, and belongs to the technical field of fluoropolymer preparation. Background technique [0002] Fluoropolymer is one of the materials with the most excellent comprehensive performance among polymer materials. It has outstanding chemical stability, heat resistance, self-lubrication, and weather resistance. It is often used in key parts to resist harshness. The environment plays a special role and is an indispensable functional material in many fields and modern technology. In the industry, suspension polymerization and dispersion polymerization are generally used to prepare fluoropolymers. The difference between suspension polymerization and dispersion polymerization process is that suspension polymerization does not add dispersant and obtains precipitated resin under vigorous stirr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F14/18C08F214/18C08F2/16C08F114/26C08F214/26C08F214/28C08F114/22C08F114/20C08F114/18
Inventor 夏俊魏文涛
Owner SHANDONG DONGYUE POLYMER MATERIAL
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