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Concentrated aqueous dispersion of fluorine-containing polymer as well as preparation method and application of concentrated aqueous dispersion

A water-based dispersion, polymer technology, used in abrasion-resistant fibers, textiles and papermaking, fiber processing, etc., can solve the problems of poor biodegradability, unfriendly environment, limited wide application, etc., and achieve good stability and good gloss. The effect of low viscosity and low viscosity

Pending Publication Date: 2022-04-22
SHINE POLYMER (ZHUHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such polyoxyethylene ether surfactants have poor biodegradability and are not environmentally friendly, thus limiting the wide application of concentrated aqueous dispersions of such fluoropolymers

Method used

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  • Concentrated aqueous dispersion of fluorine-containing polymer as well as preparation method and application of concentrated aqueous dispersion
  • Concentrated aqueous dispersion of fluorine-containing polymer as well as preparation method and application of concentrated aqueous dispersion
  • Concentrated aqueous dispersion of fluorine-containing polymer as well as preparation method and application of concentrated aqueous dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] In a 5L stainless steel high-pressure reactor equipped with a jacket and a horizontal stirrer, add 3000g of deionized water and 80g of paraffin, heat the contents of the reactor to 70°C, and vacuumize the reactor, replace it with nitrogen, and then use tetrafluoroethylene (TFE) purge. Add 0.02 g of polymerization initiator ammonium persulfate, 3 g of fluorine-containing emulsifier (sodium perfluorohexyl acetate), control the reaction pressure to 2.5 MPa, and continuously feed TFE through the compressor. By means of emulsion polymerization, a starting aqueous dispersion of polytetrafluoroethylene particles is prepared. The solid content of this dispersion is about 30% by weight, and the average particle size of the polytetrafluoroethylene particles is 250 nm.

[0083] Get the initial aqueous dispersion of 2kg polytetrafluoroethylene particles (wherein contain the sodium perfluorohexyl acetate of about 0.2wt% based on the weight of polytetrafluoroethylene particles), add...

Embodiment 2

[0085] According to the steps in Example 1, the difference is that the sodium dodecylbenzenesulfonate anionic surfactant represented by SDBS replaces the SDS in Example 1, and the consumption is 6 wt%, and vacuum concentration is carried out, and the obtained concentrated aqueous dispersion The solid content of the body is about 64.8wt%. The performance test results are shown in Table 1 below.

Embodiment 3

[0087] Carry out according to the step in embodiment 1, difference is that the sodium dodecyl diphenyl ether disulfonate anionic surfactant represented in the aqueous solution of 45% SLDED replaces the SDS among the embodiment 1, consumption is 6wt% (in SLDED dry basis), carry out vacuum concentration, the solid content of gained concentrated aqueous dispersion is about 61.3%. The performance test results are shown in Table 1 below.

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Abstract

The invention discloses a concentrated aqueous dispersion of a fluorine-containing polymer as well as a preparation method and application of the concentrated aqueous dispersion, and belongs to the technical field of coatings. A concentrated aqueous dispersion of a fluorine-containing polymer according to the present invention comprises fluorine-containing polymer particles dispersed in an aqueous solvent, an anionic surfactant, and an optional nonionic surfactant selected from a polyvinylpyrrolidone-based polymer represented by formula (I), and does not comprise a polyoxyethylene ether-based surfactant. The total content of the anionic surfactant and the optional nonionic surfactant is from 2 to 16 wt% based on the weight of the fluoropolymer particles. The concentrated aqueous dispersion of the fluorine-containing polymer disclosed by the invention has the characteristics of low viscosity and good stability, is environment-friendly, can be used for producing a fluorine-containing polymer anti-dripping agent, impregnated porous glass and porous metal or used as a coating, and has the characteristics of good appearance, wear resistance and the like.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a concentrated aqueous dispersion of fluorine-containing polymers and a preparation method and application thereof. Background technique [0002] Fluoropolymers (such as polytetrafluoroethylene, etc.) have excellent chemical stability, good electrical properties, and low surface energy, and are widely used in chemical, aerospace, military and other industries. Fluoropolymer aqueous dispersions are widely used It is widely used in the anticorrosion of oil platforms, reactors, aircraft, and oil pipelines in the production of non-stick materials in daily life. [0003] The solid content of the initial aqueous dispersion of fluorine-containing polymer particles obtained from fluorine-containing polymer units is generally less than 30%, and contains a large amount of water. It is not suitable for direct preparation and use of coatings. It needs to be concentrated to a higher concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L27/18C08K5/41C08K5/42D06M15/256D06M13/262D06M13/256
CPCC08J3/03D06M15/256D06M13/262D06M13/256C08J2327/18C08K5/41C08K5/42D06M2200/35
Inventor 潘杰辉王静会魏国强冯璋霓石建伟
Owner SHINE POLYMER (ZHUHAI) CO LTD
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