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High strength and low tank pressure perfluorinated ion exchange membrane for chlor-alkali industry and preparation method thereof

A technology of perfluorinated ion and chlor-alkali industry, applied in organic diaphragms, cells, electrolytic components, etc., can solve the problems of lack of fiber support and reinforcement, lack of ion exchange capacity, loss of mechanical strength of ion membrane, etc., to shorten the hydrolysis transformation time , avoid transmission resistance, improve the effect of mechanical strength

Active Publication Date: 2021-12-07
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the added nano sacrificial fiber material itself does not have ion exchange capacity, so the author requires them to be "sacrificed" when the perfluorinated ion exchange membrane works, forming pores, but once the pores are formed, the perfluorinated ion exchange membrane will be missing The support and reinforcement of a part of the fiber will inevitably cause a certain loss and reduction of the mechanical strength of the ion membrane.

Method used

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  • High strength and low tank pressure perfluorinated ion exchange membrane for chlor-alkali industry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The perfluorosulfonic acid resin in this example has an ion exchange capacity of 0.90 mmol / g, and is a powder obtained by copolymerization of tetrafluoroethylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride body.

[0035] (1) Preparation of resin pellets

[0036] The micro-nano hollow fiber material with an outer diameter of 300nm, a length of 10μm, and an inner diameter of 20nm, and the above-mentioned perfluorosulfonic acid resin powder are fully mixed at a mass ratio of 1:100, and then melt-extruded and granulated to obtain a micro-nano hollow fiber. The material is pellets of perfluorosulfonic acid resin.

[0037] 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; ion exchange capacity It is 0.88mmol / g.

[0038] (2) Membrane preparation and reinforcement

[0039] The above-mentioned perfluorocarb...

Embodiment 2

[0044] The raw materials of perfluorosulfonic acid resin and perfluorocarboxylic acid resin powder are the same as in Example 1.

[0045] (1) Preparation of resin pellets

[0046] The micro-nano hollow fiber material with an outer diameter of 20 μm, a length of 50 μm, and an inner diameter of 50 nm, which has ion exchange capacity, is fully mixed with the above-mentioned perfluorosulfonic acid resin powder at a mass ratio of 10:100, and then melt-extruded and granulated to obtain a micro-nano hollow fiber. The material is pellets of perfluorosulfonic acid resin. The pellet preparation of perfluorocarboxylic acid resin is the same as in Example 1.

[0047] (2) Membrane preparation and reinforcement

[0048] Using the above-mentioned perfluorocarboxylic acid resin pellets and perfluorosulfonic acid resin pellets containing micro-nano hollow fiber materials, respectively obtain perfluorocarboxylic acid ion exchange resin membranes and perfluorosulfonic acid ion exchange resin m...

Embodiment 3

[0053] Step (1), step (2) and step (3) are identical with embodiment 1. The difference is that the micro-nano hollow fiber material with ion exchange capacity in step (1) has an outer diameter of 20 μm, a length of 10 μm, and an inner diameter of 10 nm.

[0054] The ion-exchange membrane prepared by the present embodiment has a tensile strength of 39MPa, and can be used for the ion-exchange membrane in the chlor-alkali ion-exchange membrane electrolyzer, at 6.0kA / 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 210g / L, the tank temperature is 86±1°C, the active cathode is under the conditions of zero pole distance Test, the cell voltage is 3.03V, after that, according to the standard SJ / T 10171.5 method, the surface resistance of the obtained film is 1.60Ω·cm 2 .

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Abstract

The invention relates to a perfluorinated ion-exchange membrane with high strength and low tank pressure for chlor-alkali industry and a preparation method thereof, belonging to the technical field of perfluorinated ion-exchange membranes. The high-strength and low-pressure perfluorinated ion-exchange membrane for chlor-alkali industry of the present invention is composed of a perfluorosulfonic acid resin layer and a perfluorocarboxylic acid resin layer to form a base membrane, and a reinforced fiber mesh cloth is embedded in the perfluorosulfonic acid resin layer. The two outer surfaces of the base film are spray-coated with a gas release coating; the perfluorosulfonic acid resin layer contains discontinuous micro-nano channels, and the micro-nano channels are located in the perfluorosulfonic acid resin layer. Made of nano hollow fibers. The high-strength and low-cell pressure perfluorinated ion exchange membrane for chlor-alkali industry of the invention not only has good electrochemical performance, but also has excellent mechanical strength; the invention also provides a simple and easy preparation method.

Description

technical field [0001] The invention relates to a perfluorinated ion-exchange membrane with high strength and low tank pressure for chlor-alkali industry and a preparation method thereof, belonging to the technical field of perfluorinated ion-exchange membranes. Background technique [0002] DuPont of the United States developed perfluorosulfonic acid resin and its ion exchange membrane in the 1960s. It was quickly found that this perfluorinated ion exchange membrane with a skeleton structure has extraordinary stability and is most suitable for use in the harsh environment of chlor-alkali electrolyzers, so it has been widely used in the chlor-alkali industry. Inspired by DuPont's perfluorinated ion-exchange membrane, Japan's Asahi Glass Company and Japan's Asahi Kasei Corporation have also successively developed perfluorinated ion-exchange resins and ion-exchange membranes with similar structures. In 1976, Asahi Kasei Corporation of Japan replaced DuPont's perfluorosulfonic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B13/08C25B1/46C25B9/19
CPCC25B1/46C25B13/08
Inventor 杨淼坤李晓滕培峰王丽冯威张江山张永明
Owner SHANDONG DONGYUE POLYMER MATERIAL
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