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Reinforced perfluorocarboxylic acid ion exchange membrane with rough coating, and preparation method thereof

A perfluorocarboxylic acid ion and rough coating technology, which is applied in the field of ion exchange membranes, can solve the problems of small roughness of the gas release coating, inability to effectively reduce the cell voltage, and low surface energy of fluorine-containing materials, so as to improve the electrolysis current Efficiency, improvement of membrane surface roughness, and ease of industrial production

Inactive Publication Date: 2020-05-22
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The following problems still exist in the above-mentioned patents: the surface energy of the fluorine-containing material is low, and it is easy to adhere to some small-sized bubbles underwater, while the roughness of the gas-releasing coating is small, and the bubble-repelling performance is limited, so it cannot be effectively reduced. Cell voltage, reduce electrolysis energy consumption

Method used

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  • Reinforced perfluorocarboxylic acid ion exchange membrane with rough coating, and preparation method thereof
  • Reinforced perfluorocarboxylic acid ion exchange membrane with rough coating, and preparation method thereof

Examples

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Embodiment 1

[0044] A reinforced perfluorocarboxylic acid ion exchange membrane with a rough coating was prepared as follows:

[0045](1) The perfluorocarboxylic acid resin of IEC=0.8mmol / g is extruded and casted to obtain a perfluorocarboxylic acid ion exchange resin base film with a thickness of 70 μm, and then the polytetrafluoroethylene fiber and silk are according to the volume ratio of 1: 1 Composite braided porous reinforcement (thickness 40 μm, porosity 30%), soaked in ultrasonically treated trifluorotrichloroethane solvent for 1.5 h, taken out and dried, and mixed with perfluorocarboxylic acid ion exchange resin base The membrane is compounded to form a perfluorocarboxylic acid ion exchange membrane precursor;

[0046] (2) Under 180°C and 120t pressure, the perfluorocarboxylic acid ion exchange membrane precursor is subjected to overpressure treatment with an overpressure machine at a speed of 45m / min. After the overpressure treatment, it is then immersed in an alkaline solution o...

Embodiment 2

[0063] A reinforced perfluorocarboxylic acid ion exchange membrane with a rough coating was prepared as follows:

[0064] (1) Extrude and cast the perfluorocarboxylic acid resin with IEC=1.3mmol / g to obtain a perfluorocarboxylic acid ion exchange resin base film with a thickness of 250 μm, and then mix polytetrafluoroethylene and silk at a volume ratio of 1:1.2 Composite braided porous reinforcement (thickness 40 μm, porosity 25%), soaked in ultrasonically treated trifluorotrichloroethane solvent for 1.5h, taken out and dried, and perfluorocarboxylic acid ion exchange resin base membrane Composite to form a perfluorocarboxylic acid ion exchange membrane precursor;

[0065] (2) Under the pressure of 160°C and 100t, the perfluorocarboxylic acid ion exchange membrane precursor is subjected to overpressure treatment with an overpressure machine at a speed of 45m / min. After the overpressure treatment, it is then immersed in an alkaline solution of 80°C ( Containing 15wt% dimethyl ...

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Abstract

The invention belongs to the technical field of ion exchange membranes, and particularly relates to a reinforced perfluorocarboxylic acid ion exchange membrane with a rough coating, and a preparationmethod thereof. The reinforced perfluorocarboxylic acid ion exchange membrane is composed of a perfluorocarboxylic acid polymer layer, a porous reinforcing material layer and functional surface coatings, wherein the functional surface coatings are located on the upper surface and the lower surface of the perfluorocarboxylic acid polymer layer, the porous reinforcing material layer is embedded in the perfluorocarboxylic acid polymer layer, and the functional surface coating is of a porous rough structure composed of a perfluorinated ionic polymer and a metal oxide. The reinforced perfluorocarboxylic acid ion exchange membrane with the rough coating can effectively reduce the cell voltage, reduce the electrolysis energy consumption and reduce the production cost in a novel zero-polar-distance electrolytic cell under the condition of high current density, and is suitable for the field of electrolysis of sodium chloride and potassium chloride. The invention also provides a preparation method of the reinforced perfluorocarboxylic acid ion exchange membrane.

Description

technical field [0001] The invention belongs to the technical field of ion exchange membranes, and in particular relates to a reinforced perfluorocarboxylic acid ion exchange membrane with a rough coating and a preparation method thereof. Background technique [0002] The application of perfluorinated ion exchange membranes in the salt electrolysis industry has caused revolutionary changes in the chlor-alkali industry. The current commercial perfluorinated ion exchange membranes (chlor-alkali ion membranes) for the chlor-alkali industry are all perfluorocarboxylic acid-perfluorosulfonic acid composite membranes, that is, the anode side of the membrane is a perfluorosulfonic acid layer, and the cathode side is a perfluorocarboxylic acid layer. layer. The sulfonic acid layer has high ion permeability, and has a lower cell voltage when the alkali concentration is 20% to 30%, so it can significantly save power consumption; while the carboxylic acid layer can block the OH-ion fr...

Claims

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Application Information

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IPC IPC(8): C25B13/08C25B13/02C25B1/46
CPCC25B1/46C25B13/02C25B13/08
Inventor 张永明刘烽张恒冯威李志勇张波赵彬雷建龙张志浩
Owner SHANDONG DONGYUE POLYMER MATERIAL
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