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Micro-nano pore-containing chlorine-alkali ion membrane preparation method

A technology of ion-exchange membrane and ion-exchange membrane, applied in the direction of diaphragm, organic diaphragm, electrolysis process, etc., can solve problems affecting the performance of chlor-alkali membrane, achieve excellent high-temperature thermal stability, reduce transmission resistance, and improve mechanical strength.

Inactive Publication Date: 2015-03-04
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after long-term research, it has been found that due to the presence of sulfonic acid groups in the ion membrane, the presence of divalent metal carbonates will inevitably lead to the coordination complexation or chelation of divalent metal ions and sulfonic acid groups during the treatment process. The formation of impurity deposition will seriously affect the performance of the chlor-alkali membrane

Method used

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  • Micro-nano pore-containing chlorine-alkali ion membrane preparation method

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Embodiment 1

[0038] a. Preparation of resin pellets

[0039] The perfluorosulfonic acid resin is the powder obtained by copolymerization of tetrafluoroethylene and perfluoro 3-oxa-4-butenesulfonyl fluoride, the ion exchange capacity is 0.99mmol / g, and the sodium chloride particles ( It can be prepared according to the literature method: Zhang Li, Cheng Humin, Ma Jiming. Preparation of NaCl nanoparticles in non-aqueous inverse microemulsion [J]. Acta Physicochemical Sinica, 2002, 18(01): 79-81.) and the above-mentioned perfluorosulfuronium The acid resin powder is fully mixed according to the mass ratio of 9:100, and then melted, extruded and granulated to obtain perfluorosulfonic acid resin pellets containing nano-sodium chloride particles.

[0040] The powder obtained by copolymerization of tetrafluoroethylene and perfluoro-4,7-dioxa-5-methyl-8-nonenoate methyl ester is melt-extruded and granulated to obtain pellets of perfluorocarboxylic acid resin. The capacity is 0.95mmol / g.

[0041]...

Embodiment 2

[0048] (1) Preparation of resin pellets

[0049] Perfluorosulfonic acid resin is a powder obtained by copolymerization of tetrafluoroethylene, hexafluoropropylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride, with an ion exchange capacity of 1.06mmol / g , the potassium chloride powder (dissolvable ultrafine powder) with a particle size of 100nm to 10μm is fully mixed with the above-mentioned perfluorosulfonic acid resin powder (mass ratio 15:100), and then melted and extruded to obtain soluble ultrafine powder. Granules of fine powder perfluorosulfonic acid resin. The powder obtained by copolymerization of tetrafluoroethylene and perfluoro 4,7-dioxa-5methyl-8-nonenoate methyl ester has an ion exchange capacity of 0.97mmol / g, and the perfluoro Pellets of carboxylic acid resin.

[0050] (2) Membrane preparation and reinforcement

[0051] Using the above-mentioned perfluorocarboxylic acid resin pellets and the perfluorosulfonic acid resin pellets containing potass...

Embodiment 3

[0057] Step (1), step (2) and step (3) are the same as in Example 1, except that the average particle size of the dissolvable ultrafine powder in step (1) is a hollow structure sodium chloride powder with an average particle size of 100 nm to 10 μm (It can be prepared according to the literature method: Tao Yuhong et al., Preparation and Surface Analysis of Ultrafine Sodium Chloride Powder with Hollow Structure, Inorganic Salt Industry, 2010, 42(7): 31-33).

[0058] The prepared ion membrane tensile strength of the present embodiment is 39MPa, can be used for the ion exchange membrane in the chlor-alkali ion membrane electrolyzer, at 7.5kA / m 2 Under the current density, the mass ratio concentration of the cathode NaOH solution is 32%, the concentration of the anode brine entering the tank is 305g / L, the concentration of the brine leaving the tank is 203g / L, the tank temperature is 85-87°C, the active cathode is under the conditions of 1mm pole distance According to the test, t...

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Abstract

The present invention relates to a micro-nano pore-containing chlorine-alkali ion membrane preparation method, which comprises: adopting monovalent alkali metal chloride MCl ultra-fine powder as a sacrifice core material, adding to a perfluorosulfonic acid resin powder material, completely mixing, carrying out melting extrusion to obtain a MCl-containing perfluorosulfonic acid resin master batch, carrying out a melting co-extrusion or multi-layer hot pressing compounding process on the MCl-containing perfluorosulfonic acid resin master batch and the perfluorosulfonic acid resin to prepare a perfluorinated ion exchange resin base film, placing a reinforcing mesh cloth into the surface or the internal of the prepared perfluorinated ion exchange resin base film to form a reinforced ion membrane, carrying out hydrolysis transformation, carrying out double side spraying on the transformed ion membrane to form a gas release coating, and carrying out standing aging in a sodium hydroxide aqueous solution to obtain the finished product. The membrane can be used for the ion exchange membrane in the chlorine-alkali industry, especially for the 6-8 kA / m<2> ultra-high current density chlorine-alkali electrolysis process, and has the good mechanical property and the good electrochemical property.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a fiber-reinforced ion exchange membrane for chlor-alkali industry containing micro-nano pores and a preparation method thereof. Background technique [0002] 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. In order to obtain a high current density of the ion membrane while maintaining a certain mechanical strength and dimensional stability, fibers, cloth, fabrics and other materials are usually used to enhance the mechanical strength of the ion membrane and maintain the dimensional stability of the membrane material. Generally speaking, when the ion exchange capacity of the perfluor...

Claims

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Application Information

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IPC IPC(8): C25B13/08C25B13/02C25B1/46
Inventor 王学军王婧
Owner SHANDONG DONGYUE POLYMER MATERIAL
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