Diaphragm for water electrolyzer and production method thereof

A water electrolysis cell and diaphragm technology, which is applied to organic diaphragms, electrolysis components, electrolysis processes, etc., can solve the problems of long cleaning time, poor water absorption of chemical fibers, and poor safety, and achieves fast production methods, simple operation and low cost. Effect

Active Publication Date: 2018-09-28
TORAY IND INC
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively strong liquid absorption rate of the nonwoven fabric, the invention needs to consume a lot of precious water resources and chemicals in the cleaning process after strong acid treatment, and the cleaning time is also long, and the process operation is complicated, which is easy to pollute the environment.
At the same time, the safety is also poor, and it is not suitable for industrial production
[0005] Another example is the Chinese published patent CN101195944A, which discloses a woven fabric made of one, two or three of polyetheretherketone fibers, polyphenylene sulfide fibers, and polypropylene fibers as an asbestos-free, environmentally friendly and energy-saving fabric. Diaphragm cloth, although the air tightness of the diaphragm cloth meets the standard requirements for asbestos diaphragms, but due to the poor water absorption of the above chemical fibers, the resulting diaphragm cloth has poor hydrophilicity and cannot really meet the use requirements

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Diaphragm for water electrolyzer and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The warp and weft yarns are all woven with polyphenylene sulfide yarns with a denier of 1772dtex on a projectile loom to obtain a plain weave fabric with a warp density of 154 / 10cm and a weft density of 106 / 10cm. Refining and drying at 90°C at a speed of 30m / min to obtain a polyphenylene sulfide woven fabric, and then bonding a polytetrafluoroethylene film with a thickness of 30 μm to the polyphenylene sulfide by thermal bonding at 220°C One side of the woven fabric, and finally vacuum plasma treatment is performed on the coated polyphenylene sulfide woven fabric, the treatment conditions: under the simultaneous action of oxygen and argon, the treatment intensity is 150KW·s / m 2 Finally, a diaphragm for water electrolyzer with a thickness of 0.90 mm and an average pore diameter of 0.5 μm was obtained, and the pores with a pore diameter in the range of 0.2 to 10 μm accounted for 90% of all pores. The prepared diaphragm was analyzed by X-ray photoelectron spectroscopy. Tes...

Embodiment 2

[0046] The warp and weft yarns are all woven on a projectile loom with polyphenylene sulfide yarns with a denier of 1181dtex to obtain a plain weave fabric with a warp density of 177 / 10cm and a weft density of 122 / 10cm. Refining and drying at 95°C at a speed of 35m / min to obtain a polyphenylene sulfide woven fabric, and then bonding a polytetrafluoroethylene film with a thickness of 25 μm to the polyphenylene sulfide by thermal bonding at 240°C Both sides of the woven fabric, and finally vacuum plasma treatment on the coated polyphenylene sulfide woven fabric, treatment conditions: under the action of air, the treatment intensity is 100KW·s / m 2 Finally, a diaphragm for water electrolyzer with a thickness of 0.77 mm and an average pore diameter of 4.0 μm was obtained, and the pores with a pore diameter in the range of 0.2 to 10 μm accounted for 90% of all pores. The prepared diaphragm was analyzed by X-ray photoelectron spectroscopy. Tested by the instrument, it is measured tha...

Embodiment 3

[0048] The warp and weft yarns are all woven with polyphenylene sulfide yarns with a denier of 882dtex on a projectile loom to obtain a plain weave fabric with a warp density of 160 / 10cm and a weft density of 140 / 10cm. Refining and drying at 92°C and a speed of 25m / min to obtain polyphenylene sulfide woven fabrics, and then carry out hydrophilic treatment on polyphenylene sulfide woven fabrics by vacuum plasma processing. Treatment conditions: under the action of air, the treatment intensity is 50KW·s / m 2 , and then bonded a polytetrafluoroethylene film with a thickness of 10 μm to one side of the above-mentioned polyphenylene sulfide woven fabric by thermal bonding at 250 ° C, and finally produced a water electrolyzer with a thickness of 0.70 mm and an average pore diameter of 9.0 μm A diaphragm is used, and the pores with a pore size in the range of 0.2 to 10 μm account for 80% of the total pores. The prepared diaphragm is tested by an X-ray photoelectron energy spectrum ana...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
pore sizeaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a diaphragm used for water electrolysers, and a production method thereof. The diaphragm comprises a fabric layer and a resin layer; the fabric layer is a woven fabric layer prepared from polyphenylene sulfide yarn; the resin layer is a polytetrafluoroethylene thin film layer; at least one surface of the polyphenylene sulfide fabric layer is provided with the polytetrafluoroethylene thin film layer; and average pore diameter of the diaphragm ranges from 0.01 to 10<mu>m. The diaphragm is excellent in air impermeability, hydrophily, and ion permeability, and low in cost; is safe and friendly to the environment; and is light. The production method is high in speed and efficiency; no pollution is caused; operation is simple; and energy is saved.

Description

technical field [0001] The invention relates to a diaphragm for a water electrolyzer and a production method thereof. Background technique [0002] The diaphragm occupies a very important position in any electrolyzer. It is placed between the anode and the cathode to prevent the mixing of oxygen on the anode side and the oxygen on the cathode side to ensure gas purity, improve current efficiency and safety. The specific requirements are: durability to 30% potassium hydroxide electrolyte at 100°C, oxidation resistance, small ion passage resistance, high electron passage resistance, and high initial wettability of the electrolyte And permanent wettability, higher air tightness, thinner thickness, high mechanical stability. [0003] Due to technical limitations, currently major domestic hydrogen production equipment manufacturers still use asbestos cloth as the diaphragm. When it increases, it is easy to dissolve and cause pollution to the electrolyte; and asbestos is carcino...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): C25B13/08C25B1/10
CPCY02E60/36
Inventor张晓静
OwnerTORAY IND INC