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Fluorine-containing polymer film, and preparation method and application thereof

A polymer film and polymer technology are applied in the field of fluorine-containing polymer films and their preparation, which can solve problems such as changes in film properties, difficulty in separating and reusing organic solvents, and achieve low pollution, good prospects for large-scale industrial production, mechanical Excellent performance

Inactive Publication Date: 2020-05-12
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problems of the phase inversion method are also more prominent, such as the large amount of organic solvent contained in the coagulation bath after film formation, which is difficult to separate and reuse, the film is dried after solidification, and the film performance changes during the drying process, etc.

Method used

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  • Fluorine-containing polymer film, and preparation method and application thereof
  • Fluorine-containing polymer film, and preparation method and application thereof
  • Fluorine-containing polymer film, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Add poly(vinylidene fluoride-hexafluoropropylene) copolymer and modification additive NMP in 15mL acetone solvent, the mass fraction of polymkeric substance in solution is respectively 0.5%, 10% and 20%, the mass fraction of NMP is 5% , After stirring for 24h, a homogeneous solution was formed for later use. Fill the bottom of the desiccator with ammonia water, put the tray and glass substrate into the desiccator, seal the desiccator for 24 hours, and put the desiccator in an oven to control the temperature at 20°C. After the liquid volatilizes, the atmosphere steam fills the entire desiccator. Cast the spare solution on a glass substrate in a closed desiccator (casting and casting into a solution layer with a thickness of 0.01-20 mm), and let it stand for 24 hours. During the standing process, as the solvent volatilizes, the surface temperature of the solution decreases, and the steam atmosphere, which is a poor solvent for fluoropolymers, condenses on the surface of t...

Embodiment 2

[0042] Add 750 mg of polyvinylidene fluoride to 15 mL of acetone solvent, stir for 24 hours to form a uniform solution for later use. The airtight container is filled with 50% / 50% and 20% / 80% ammonia-ethanol mixed atmosphere, and the temperature is controlled at -10°C. The above-mentioned standby solution was cast-cast on the glass substrate placed in the above-mentioned steam atmosphere (cast-cast to form a solution layer with a thickness of 0.01-20 mm), and stood still for 24 hours. During the standing process, as the acetone volatilizes, the surface temperature of the solution decreases, and ammonia vapor, which is a poor solvent for fluoropolymers, condenses on the surface of the solution, dehydrofluorination cross-linking and steam-induced phase separation occur. After the solvent is completely volatilized, it can be A polyvinylidene fluoride film with a white surface and various morphologies was prepared. Since the prepared film has interpenetrating porous structure and...

Embodiment 3

[0044] Add ethylene-tetrafluoroethylene copolymer and trimethyl phosphate to 15 mL of tetrahydrofuran solvent, the mass fraction of both in the solution is 5%, and stir for 24 hours to form a uniform solution for later use. The airtight container is filled with a mixed atmosphere of methanol and ethanol, the content of methanol is controlled at 20-80%, and the temperature is controlled at 30°C. The above-mentioned standby solution was cast-cast on the glass substrate placed in the above-mentioned steam atmosphere (cast-cast to form a solution layer with a thickness of 0.01-20 mm), and stood still for 24 hours. During the standing process, the surface temperature of the solution decreases with the volatilization of tetrahydrofuran, and ammonia water vapor, which is a poor solvent for fluoropolymers, condenses on the surface of the solution, and a steam-induced phase separation process occurs. After the solvent is completely volatilized, the following Figure 5 Surface white pol...

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Abstract

The invention discloses a fluorine-containing polymer film, and a preparation method and an application thereof. The fluorine-containing polymer film is prepared from raw material components includinga fluorine-containing polymer, a modification additive, a fluorine-containing polymer good solvent and a fluorine-containing polymer poor solvent through a steam-induced phase separation method, thefluorine-containing polymer film has the properties of a symmetric film or an asymmetric film, the microstructure of the fluorine-containing polymer film comprises compact, nodular and cellular pores,the porosity of the fluorine-containing polymer film is 20-85%, and the pore size range of the fluorine-containing polymer film is 150-3000 nm. The fluorine-containing polymer film can be a symmetricor asymmetric film, is adjustable in microstructure, surface performance, porosity and pore size, has an application prospect in the separation fields such as microfiltration, ultrafiltration, oil-water separation and emulsion oil-water separation, and can also be used for a battery diaphragm.

Description

technical field [0001] The invention belongs to the technical field of organic polymer materials, and in particular relates to a fluorine-containing polymer film and a preparation method and application thereof. Background technique [0002] Polymer porous membrane materials have broad application prospects in the fields of membrane separation and battery separators. Due to the high C-F bond energy and the low surface energy of F atoms, fluorine-containing polymer materials endow it with high mechanical properties, thermal stability and chemical stability, thus becoming an important candidate material for the preparation of separation membranes. Ion batteries and sensors have important applications. Therefore, methods to control the microporous morphology of fluoropolymer films have received more and more attention. However, due to the small radius of F atoms, fluoropolymers are easy to crystallize, and their melting point even exceeds their decomposition temperature, so i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/32B01D61/18B01D67/00B01D69/02B01D71/82H01M2/16
CPCB01D61/18B01D67/0013B01D67/0093B01D69/02B01D71/32B01D71/82B01D2325/02H01M50/411Y02E60/10
Inventor 熊晓鹏霍鹏
Owner XIAMEN UNIV
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