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a dispersion

A technology of dispersion and aqueous dispersion, applied in the field of dispersion, can solve the problems of not involving the yield and particle size of fluorine-containing polymer, refractory degradation, and no substantial improvement in production efficiency, so as to be suitable for wide popularization and use. , the effect of increased degradation performance and not easy to enrich

Active Publication Date: 2017-01-18
成都晨光博达新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] From the content disclosed in the above patent documents, we can also know that the existing disclosed fluorine-containing emulsifiers are all effective. Although the toxicological characteristics of fluorine-containing emulsifiers have been solved, none of them involve the production Product characteristics such as rate and particle size, taking the above-mentioned invention patent CN101218264B as an example, in this patent document, the comparison data of polymerization time, average particle size, SSG (particle specific gravity of fluoropolymer) and solid content are given, except polymerization time In addition, the rest of the data have no obvious fluctuations. It can be seen that although the existing fluorine-containing emulsifiers that do not contain PFOA have solved the possible harm to the human body due to the high stability and refractory characteristics of PFOA / PFOS, they have no effect on the entire production process. The efficiency has not been substantially improved. Based on the increasingly fierce competition in the existing market, we must find a new fluorinated emulsifier, which can not only replace the use of PFOA / PFOS, but also obtain Long-term, effective economic benefits

Method used

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Examples

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Embodiment 1

[0094] Polytetrafluoroethylene is prepared from the gaseous fluorinated monomer-tetrafluoroethylene through aqueous emulsion polymerization, and 1-bromo-polyfluoroalkoxyether acid is added to the aqueous emulsion polymerization as a fluorine-containing emulsifier. The specific implementation steps as follows:

[0095] A: Prepare the aqueous solution of the salt of 1-bromo-polyfluoroalkoxycarboxy ether acid: add 700ml of deionized water and 100ml of 25% ammonia water to a 2000ml glass beaker, and then pour it into the deionized water slowly and uniformly through the glass dropping funnel Add dropwise the 1-bromo-polyfluoroalkyl carboxylic acid of 200g, stir while dripping, the stirring speed is 80 rpm, then, obtain polyfluoroalkoxy ether acid ammonium aqueous solution for subsequent use, wherein, 1-bromo -The weight ratio of ammonium polyfluoroalkoxy carboxy etherate to water is 20:100;

[0096] B: Polymerization preparation: Replace the high-pressure polymerization kettle wit...

Embodiment 2

[0112] Polychlorotrifluoroethylene is prepared from gaseous fluorinated monomer—chlorotrifluoroethylene through aqueous emulsion polymerization, and 1-bromo-polyfluoroalkoxy carboxylether acid is added in the aqueous emulsion polymerization as a fluorine-containing emulsifier. The specific implementation steps are as follows:

[0113] A: Prepare the aqueous solution of the salt of 1-bromo-polyfluoroalkoxycarboxy ether acid: add 2800ml of deionized water and 400ml of 25% ammonia water in a 5000ml glass beaker, and then slowly and uniformly pour into the deionized water through the glass dropping funnel Add dropwise the 1-bromo-polyfluoroalkyl carboxylic acid of 800g, stir while dripping, the stirring speed is 80 rpm, then, obtain polyfluoroalkoxy ether acid ammonium aqueous solution for subsequent use, wherein, 1-bromo - The weight ratio of poly(polyfluoroalkoxy carboxy ether ammonium acid) to water is 20:100;

[0114] B: Polymerization preparation: replace the high-pressure p...

Embodiment 3

[0123] Vinylidene fluoride-chlorotrifluoroethylene is produced by aqueous emulsion polymerization of vinylidene fluoride and chlorotrifluoroethylene, and 1-chloro-polyfluoroalkoxyether-ammonium p-benzenesulfonate is added to the aqueous emulsion polymerization as the Fluorine emulsifier, the specific implementation steps are as follows:

[0124] A: Prepare the aqueous solution of the salt of 1-chloro-polyfluoroalkoxyether-p-benzenesulfonic acid: add 700ml deionized water and 100ml 25% ammonia water in a 2000ml glass beaker, then pour the deionized water through the glass dropping funnel Slowly add 200g of 1-chloro-polyfluoroalkoxyether-p-benzenesulfonic acid dropwise at a uniform speed in water, stir while adding dropwise, the stirring speed is 80 rpm, and then, obtain ammonium polyfluoroalkoxyether acid An aqueous solution, wherein the weight ratio of 1-chloro-polyfluoroalkoxy ether-ammonium p-benzenesulfonate to water is 20:100;

[0125] B: Polymerization preparation: repla...

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Abstract

The invention discloses a dispersion which is a water-based dispersion solution composed of a fluorine-containing polymer free of perfluoro-octanoic acid or perfluoro-octylsulfonic acid and a polyfluothane oxy ether acid salt water solution used as an emulsifier, wherein the polyfluothane oxy ether acid is a halogen-terminated or hydrogen-terminated polyfluothane oxy ether acid emulsifier. The technical scheme mainly relates to the following three improvements: (1) the polyfluothane oxy ether acid or salt thereof selected instead of PFOA / PFOS as the fluorine-containing emulsifier can be effectively used in aqueous emulsion polymerization reaction of fluorinated monomers; (2) the prepared fluorine-containing polymer is free of perfluoro-octanoic acid or perfluoro-octylsulfonic acid, and thus, satisfies the environmental requirement; and (3) the fluorine-containing polymer conforms to the cost accounting, can greatly enhance the single-kettle yield of the equipment on the premise of not increasing the production equipment and personnel, and meanwhile, can enhance the polymerization time, polymerization yield and other production indexes.

Description

technical field [0001] The invention relates to a dispersion, specifically relates to a mixed substance composed of a fluorine-containing polymer and an emulsifier in the process of preparing the fluorine-containing polymer, and belongs to the field of synthesis of the fluorine-containing polymer. Background technique [0002] Fluoropolymer is a general term for alkane polymers in which some hydrogen atoms are replaced by fluorine atoms. It is also a special kind of polymer material, which can be polymerized by one or more fluorine-containing monomers under certain conditions. The fluorine-carbon bond with high bond energy in its structure and the shielding effect of fluorine atoms on the molecular chain make it have a series of excellent characteristics, such as: excellent chemical corrosion resistance, dielectric properties, weather resistance, non-stickiness, excellent Friction properties, etc. Of course, due to its excellent performance, fluoropolymers have become one of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F114/26C08F114/24C08F214/22C08F214/24C08F214/28C08F214/26C08F2/26C08F2/28
Inventor 刘皓陆盛麟张林周家发郎宏波
Owner 成都晨光博达新材料股份有限公司
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