CN116479449A - A kind of preparation method of diaphragm supporting net of electrolyzer - Google Patents

Abstract

The application relates to the field of electrolytic cell diaphragm cloth, in particular to a manufacturing method of an electrolytic cell diaphragm support net, which comprises the following steps of S1: performing monofilament forming treatment on a preset fiber material to obtain a plurality of target monofilaments; the target monofilament is a monofilament with a preset diameter; s2: weaving a plurality of target monofilaments according to the preset supporting network aperture to obtain a prefabricated supporting network, wherein the warp density and the weft density of the prefabricated supporting network are determined based on the preset supporting network aperture; s3: performing shaping treatment and hot pressing treatment on the prefabricated support net in the step S2 to obtain a support net with preset thickness; according to the method, the target monofilaments with the preset diameters are processed by the preset fiber materials, the target monofilaments are woven according to the determined warp density and weft density, and the target monofilaments are woven into the prefabricated support net, so that the prefabricated support net has good mesh aperture and porosity, the influence of the thickness of the diaphragm support net of the electrolytic cell on the physical strength of the diaphragm and the internal resistance of the electrolytic cell is reduced, and the electrolytic efficiency is improved.

Description

A kind of preparation method of diaphragm supporting net of electrolyzer

technical field

The present application relates to the technical field of electrolyzer diaphragm, in particular to a preparation method of electrolyzer diaphragm supporting net.

Background technique

In the process of hydrogen production by alkaline electrolysis of water, the cathode produces H ₂ and the anode produces O ₂ . If H ₂ and O ₂ are mixed, not only will the purpose of producing H ₂ not be achieved, but it will also bring safety hazards. This requires a diaphragm to strictly separate H ₂ and O ₂ . On the one hand, the diaphragm must be able to block the mixing of hydrogen and oxygen to ensure the purity of hydrogen, on the other hand, it must allow the ions in the solution to pass through, ensure the continuous electrolysis process, and reduce the resistance of the diaphragm as much as possible to reduce energy consumption.

In order to solve the above problems, the traditional technology is to use asbestos as the diaphragm material, but the swelling property of asbestos in the alkaline electrolyte and the harm of asbestos to the human body make it gradually eliminated. And the asbestos diaphragm cloth can only be used for a long time below 90°C. After the equipment has been in operation for a long time, the asbestos fibers will fall off and the pores will increase, resulting in the direct mixing of hydrogen and oxygen. The diaphragm widely used in the industry is a new type of composite diaphragm based on polyphenylene sulfide (PPS) fabric. PPS fabric has the characteristics of excellent heat resistance, high mechanical strength, and excellent electrical properties. PPS fabric as a substrate can provide a certain physical support. At the same time, in the electrolysis process of water electrolyzer, the thickness of the diaphragm is an important parameter index. And the transmittance of electrons, the electrolysis efficiency is low.

Therefore, it is necessary to provide an improved electrolyzer diaphragm support net to solve the above problems.

Contents of the invention

Aiming at the above-mentioned problems of the prior art, the application provides a preparation method of an electrolyzer diaphragm support net, the method comprising:

S1: Perform monofilament forming processing on the preset fiber material to obtain multiple target monofilaments; the target monofilaments are monofilaments with a preset diameter;

S2: Weaving a plurality of target monofilaments according to the aperture of the preset support mesh to obtain a prefabricated support mesh, the warp density and weft density of the prefabricated support mesh are determined based on the preset aperture of the support mesh;

S3: Perform shaping treatment and hot-pressing treatment on the prefabricated support net in S2 to obtain a support net with a preset thickness.

Further, the S1 step includes:

S11: Perform mixing pretreatment on the preset fiber material to obtain dry powder;

S12: Melting the dry powder to obtain melt fibers;

S13: cooling the melted fibers to obtain solidified fiber threads;

S14: performing a drawing process on the solidified fiber thread to obtain the target monofilament.

Further, the preset diameter of the target monofilament is 0.05-0.15 mm.

Further, the preset support mesh has a pore size of 100-300 μm.

Further, the S2 step includes:

S21: Warping the multiple monofilaments according to the warp density;

S22: Perform weaving processing on the plurality of monofilaments according to the weft density to obtain the prefabricated support net.

Further, the pore size of the prefabricated support net is 120-360 μm.

Further, the thickness of the support mesh of the preset thickness is 0.08-0.25mm.

Further, before the step S3, it also includes performing ultrasonic pickling treatment on the prefabricated support net to obtain an optimized prefabricated support net;

The oil stain and dirt of the prefabricated support net are removed through the ultrasonic pickling treatment, and the hydrophilicity of the prefabricated support net is improved at the same time.

Further, the stereotype processing in the step S3 includes:

S31: Perform a first shaping process on the prefabricated support net according to a preset first temperature gradient to obtain a first shaped support net;

S32: Perform a second shaping process on the first shaped support net according to a preset second temperature gradient to obtain a second shaped support net;

S33: Perform a third shaping process on the second shaped support net according to a preset third temperature gradient to obtain a third shaped support net;

The preset first temperature gradient is 90-120°C, the preset second temperature gradient is 120-150°C, and the preset third temperature gradient is 150-200°C.

Further, the hot pressing treatment in step S3 may be hot calendering treatment;

The temperature of the hot calendering treatment is 160-220° C., and the pressure is 4.0-8.0 MPa.

Based on the above technical solution, the present application has the following beneficial effects:

In this application, the preset fiber material is processed into the target monofilament with a preset diameter, and then the target monofilament is woven into a prefabricated support net according to the determined warp density and weft density, so that the prefabricated support net has a good mesh aperture and porosity, and then provides a transmission channel for anions and cations in the electrolyte. mm or less, thereby shortening the distance of ions and electrons in the electrolyte passing through the supporting net, which is beneficial to reducing the resistance, reducing the influence of the thickness of the electrolytic cell diaphragm supporting net on the physical strength of the diaphragm and the internal resistance of the electrolytic cell, thereby reducing the voltage of the cell, and improving the electrolysis efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings that are required in the description of the embodiments or prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work.

Fig. 1 is the schematic flow chart of the preparation method of the electrolyzer diaphragm supporting net provided by the embodiment of the present application;

2 is a schematic flow diagram of the target monofilament forming treatment method provided by the embodiment of the present application;

3 is a schematic flow diagram of the weaving process of the target monofilament provided in the embodiment of the present application;

FIG. 4 is a schematic flow chart of the stereotype processing process in step S3 provided by the embodiment of the present application;

Fig. 5 is a schematic flow chart of the target monofilament forming process provided by the embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

For the following defined terms, unless a different definition is given in the claims or elsewhere in this specification, these definitions shall apply. All numerical values, whether or not expressly indicated, are defined herein as modified by the term "about". The term "about" generally refers to a numerical range that one of ordinary skill in the art considers equivalent to the stated value to produce substantially the same property, function, result, etc. A numerical range indicated by a lower value and an upper value is defined to include all values included within that numerical range and all subranges included within that numerical range.

It should be noted that the terms "first" and "second" in the description and claims of the present application and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, product or device comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to the process, method, product or device.

The preparation method of the electrolyzer diaphragm support net provided by the embodiment of the present application is described below with reference to the accompanying drawings. Please refer to FIG. 1 , which is a schematic flow chart of the preparation method. This specification provides method operation steps such as embodiments or flowcharts, but more or less operation steps may be included based on routine or non-creative work. The sequence of steps enumerated in the embodiments is only one of the execution sequences of many steps, and does not represent the only execution sequence. When the actual preparation method is executed, it can be executed sequentially or in parallel according to the methods shown in the embodiments or drawings. Methods include:

S1: Perform monofilament forming processing on the preset fiber material to obtain multiple target monofilaments; the target monofilaments are monofilaments with a preset diameter;

Wherein, the preset fiber material may be a fiber-grade special engineering resin material, such as polyphenylene sulfide (PPS) or polyether ether ketone (PEEK).

It should be noted that the preset diameter can be determined based on the preset thickness of the support net, specifically, the preset diameter of the target monofilament is less than half of the preset thickness of the support net, because the preset thickness of the support net is less than the sum of the warp diameter and the weft diameter.

In some embodiments, if the preset diameter of the target monofilament is 0.05-0.15 mm, the preset thickness of the obtained supporting mesh is 0.08-0.25 mm.

In some embodiments, if the preset diameter of the target monofilament is 0.06-0.10 mm, the preset thickness of the obtained supporting mesh is 0.09-0.18 mm.

In some embodiments, if the preset diameter of the target monofilament is 0.08-0.13mm, the preset thickness of the obtained supporting mesh is 0.12-0.24mm.

In some embodiments, if the preset diameter of the target monofilament is 0.10-0.15mm, then the preset thickness of the obtained supporting mesh is 0.14-0.25mm.

Specifically, the target monofilament forming process in S1 may include steps S11-S14:

S11: pre-mixing and pre-processing the preset fiber materials to obtain dry powder;

Specifically, the mixing pretreatment is drying treatment.

It should be noted that polyphenylene sulfide (PPS) slices will contain a certain amount of water during processing, and if the water content is too high, it is easy to cause broken ends during the spinning process, and even the spinning cannot be carried out normally. Therefore, the polyphenylene sulfide (PPS) slices are dried. The process must not only reduce the moisture content of the polyphenylene sulfide (PPS) slices to prevent the degradation of the polymer melt molecules caused by moisture, but also ensure that the structural properties of the polyphenylene sulfide (PPS) are not damaged.

Exemplarily, in this application, a vacuum dryer can be selected for drying, which can reduce the water content of polyphenylene sulfide (PPS) slices, improve the uniformity of water content, thereby increasing and controlling the crystallinity and softening degree of polyphenylene sulfide (PPS), and avoiding polyphenylene sulfide (PPS) from being oxidized.

S12: melting the obtained dry powder to obtain melt fibers;

Specifically, the melting temperature is 310-325°C.

It should be noted that the melting temperature can be determined according to the relative molecular mass of the resin and the melting point of the fiber material. Specifically, the upper limit of the melting temperature of the melting process can also be 325°C, 322°C, 320°C, 318°C, 315°C, etc., and the lower limit of the melting temperature can also be 310°C, 312°C, 314°C, 315°C, etc., preferably, the melting temperature is 320°C. In this way, setting the melting temperature to the above-mentioned range or point value can improve the sufficiency of melt processing, the integrity, uniformity, smoothness and yield of the internal structure of the melt fiber, and reduce the difficulty of spinning; avoid excessively high melting temperature, which will lead to low melt viscosity, and then cause the stretch caused by the self-weight of the melt to exceed the stretching of the spinneret, resulting in wool, broken ends, or even failure to spin; thereby avoiding insufficient melting caused by excessively high melt viscosity when the melting temperature is too low. In the case of poor fiber uniformity, or even in the case of non-spinning.

In some embodiments, the dry powder can be fed into a single or twin screw extruder for melt processing and output as melt fibers.

S13: Cooling the melted fibers to obtain solidified fiber strands.

Specifically, the melted fiber extruded by the screw is put into a cooling box, and cooled to obtain solidified fiber strands, and the cooling temperature in the cooling box can be set at 70-90°C.

Specifically, the upper limit of the cooling temperature in the cooling box can also be 90°C, 88°C, 85°C, 83°C, 80°C, etc., and the lower limit of the cooling temperature in the cooling box can also be 70°C, 73°C, 75°C, 78°C, 80°C, etc. Preferably, the cooling temperature can be 85°C. In this way, by setting the cooling temperature in the cooling box to the above-mentioned range or point value, the mechanical properties of the target monofilament can be improved, so that the target monofilament has sufficient strength and toughness, avoiding the problem that when the cooling temperature is lower than 70°C, the macromolecular chains of the melt fiber freeze and cannot meet the drawing motion; and when the cooling temperature is higher than 90°C, the cooling water around the melt fiber reaches the vaporization temperature and vaporizes, thereby avoiding the formation of a large number of air bubbles in the cooling water tank and affecting the mechanical properties of the target monofilament.

S14: performing drafting treatment on the solidified fiber thread to obtain the target monofilament.

Specifically, the drawing treatment process may sequentially include water bath drawing treatment, hot air drawing treatment and hot air setting treatment.

Exemplarily, after the cured fiber thread is drawn in a water bath, drawn by hot air and shaped by hot air, it is oiled and wound to make a target monofilament.

Specifically, the total draw ratio of the drawing treatment can be 2.8-4.5 times, the draw ratio of the water bath drawing treatment can be 70-85% of the total draw ratio, the drawing temperature of the hot air drawing treatment can be 130-190°C, and the temperature of the hot air setting treatment can be 190-220°C. By performing the drawing treatment and controlling the process parameters of the drawing treatment to the above range, the breaking strength of the target monofilament can reach 3.0cN/dtex or more , The elongation at break reaches more than 25%.

In some embodiments, the total draw ratio of the drawing treatment can be 3.5-4.0 times, the draw ratio of the water bath drawing treatment can be 80-85% of the total draw ratio, the drawing temperature of the hot air drawing treatment can be 160-180°C, the temperature of the hot air setting treatment can be 190-200°C, the breaking strength of the target monofilament is 3.0cN/dtex-4.5cN/dtex, and the elongation at break reaches 2 5-40%.

Specifically, the target monofilament forming process may be as shown in FIG. 5 .

Further, the breaking strength test of monofilament: According to the standard of GB/T 14344-2022 "Test Method for Tensile Properties of Chemical Fiber Filament", the ambient temperature is 20±2°C, and the relative humidity is (65±5)%. The strength test experiment is carried out under the condition of (65±5)%. The desktop computer-type tensile tester is used for the test, and the average value is measured five times. The clamping distance is (500±1.0)mm, and the tensile speed is 50cm/min.

Exemplarily, polyphenylene sulfide (PPS) slices can be put into a vacuum dryer for drying, and then the dried polyphenylene sulfide (PPS) powder can be sent to a twin-screw extruder for melting treatment at a melting temperature of 310-325°C, and then the melted fibers extruded by the screw are placed in a cooling box with a cooling temperature of 70-90°C to cool and solidify, and finally the solidified fiber strands are drawn with a total draw ratio of 2.8-4.5 times. 70-85% of the drafting ratio in water bath drafting, hot air drafting at a drafting temperature of 130-190°C, and hot air at a setting temperature of 190-220°C for shaping, then oiled and wound to make a target monofilament with a preset diameter of 0.05-0.15mm, so that the preset thickness of the support net to be obtained at the end is 0.08-0.25mm, thereby reducing the impact of the thickness of the electrolytic cell diaphragm support net on the physical strength of the diaphragm and the electrolytic cell. The influence of the internal resistance, thereby improving the electrolysis efficiency.

S2: Weaving a plurality of target monofilaments according to the aperture of the preset support mesh to obtain a prefabricated support mesh, the warp density and weft density of the prefabricated support mesh are determined based on the preset aperture of the support mesh;

Exemplarily, the warp density of the preset support net is arranged according to the preset support net aperture of 100-300 μm. Since the support net will shrink to a certain extent during the shaping process, about 15-25% of the shrinkage needs to be reserved during the weaving process.

In this embodiment, the pore size of the support mesh is set in the range of 100-300 μm to provide a transmission channel for anions and cations in the electrolyte, thereby reducing the internal resistance of the electrolytic chamber. If the pore size is too large, the airtightness of the diaphragm will be affected. If the pore size is too small, the transmission of ions in the electrolytic chamber will be hindered. The same is true for porosity. Therefore, in the present application, the pore size of the support net is set to 100-300 μm, which can improve the airtightness of the diaphragm and reduce the internal resistance of the diaphragm.

Specifically, the upper limit of the aperture of the preset support mesh can also be 300 μm, 280 μm, 250 μm, 200 μm, etc., and the lower limit of the aperture of the preset support mesh can also be 100 μm, 150 μm, 200 μm, 230 μm, etc. In this way, by setting the aperture of the preset support mesh to the above-mentioned range or point value, the air tightness of the preset support mesh and the ion transmission efficiency during the electrolysis process can be improved, thereby reducing the internal resistance of the diaphragm support mesh and reducing energy consumption. , thereby improving the electrolysis efficiency of the electrolyzer.

Specifically, according to the set support net aperture of 100-300 μm, the warp density of the preset support net can be 180 threads/10cm to 500 threads/10cm, and correspondingly, the weft density of the preset support mesh can be 190 threads/10cm to 500 threads/10cm.

Specifically, the upper limit of the warp density can be 500 threads/10cm, 480 threads/10cm, 460 threads/10cm, 440 threads/10cm, etc. The lower limit of the warp density can be 180 threads/10cm, 200 threads/10cm, 215 threads/10cm, 230 threads/10cm, etc.; correspondingly, the upper limit of the weft density can be 500 threads/10cm, 450 threads/10cm, etc. 10cm, 430 threads/10cm, 420 threads/10cm, etc., the lower limit of the weft density can be 190 threads/10cm, 195 threads/10cm, 200 threads/10cm, 210 threads/10cm, etc.

In this way, by setting the warp density and weft density of the support net to the above-mentioned range or point value, the pore diameter of the support net can be controlled between 100-300 μm, which can improve the air tightness of the diaphragm while reducing the internal resistance of the diaphragm, thereby improving the ion transmission efficiency during the electrolysis process, reducing energy consumption, and improving the electrolysis efficiency of the electrolyzer.

It should be noted that the linear density test of monofilament: the test shall be carried out according to the standard of GB/T 14343□2008 "Test Method for Linear Density of Chemical Fiber Filament".

Further, step S2 may include S21-S22:

S21: according to the warp density, warping the multiple monofilaments;

Specifically, in the warping process, steel reeds are usually selected to arrange the warp threads evenly and neatly according to a certain width and position, so as to ensure uniform tension of each single filament.

Exemplarily, a drum-type friction-driven warping machine is used to warp a plurality of monofilaments, so that the tension of each monofilament can be evenly distributed, and the warping speed is fast and the production efficiency is high.

S22: According to the weft density, weaving a plurality of monofilaments to obtain a prefabricated support net.

Specifically, the square mesh of the prefabricated support net is woven according to the designed weft density according to the plain weave texture.

Specifically, the reed arranges the warp threads in a certain order and density to ensure that the weft threads are interwoven according to the fabric structure, and make the fabric reach a predetermined width, and then make the fabric reach a predetermined density.

Specifically, the reed blade thickness of the steel reed is generally 0.13-0.4 mm.

Specifically, if the reed sheet thickness of the steel reed is t, then the calculation formula of t is as follows:

Among them, L: the number of roots per centimeter, D: the diameter of the warp, R: the proportional coefficient, and the value range of R is 85-95%.

S3: Perform shaping treatment and hot pressing treatment on the prefabricated support net in S2 to obtain a support net with a preset thickness.

Specifically, before the step S3, the prefabricated support net is subjected to ultrasonic pickling treatment to obtain an optimized prefabricated support net; further, the prefabricated support net is removed by ultrasonic pickling treatment to remove oil and dirt, and at the same time, the hydrophilicity of the prefabricated support net is improved, thereby avoiding the excessive internal resistance of the electrolytic cell caused by the weak hydrophilicity of the PPS fabric, which affects the free movement of electrolyte ions.

Specifically, the stereotype processing in step S3 includes S31-S32:

S31: Perform a first shaping process on the prefabricated support net according to the preset first temperature gradient to obtain a first shaped support net;

Specifically, the preset first temperature gradient can be 90-120°C; the shrinkage of the prefabricated support net can be controlled within a certain range through the first temperature gradient, and the first temperature gradient support net is heat-set from the point where the weaving stress is the largest, which is also the place where the temperature gradient changes most rapidly and is also the position where the support net is most likely to cause unevenness.

S32: According to the preset second temperature gradient, perform a second shaping process on the first shaped supporting net to obtain a second shaped supporting net;

Specifically, the preset second temperature gradient may be 120-150° C.; through the second temperature gradient, the pore size change of the support net may be further controlled.

S33: Perform a third shaping process on the second shaped support net according to a preset third temperature gradient to obtain a third shaped support net;

Specifically, the preset third temperature gradient can be 150-200°C; the structure of the support net is further adjusted through the third temperature gradient to ensure the stability of the support net structure and mesh aperture size.

In this embodiment, the target monofilament material can be slowly crystallized through the sub-gradient heating method, and the crystal grains are uniform, avoiding the stress concentration inside the fiber caused by the rapid temperature rise, resulting in poor flexibility and uneven breaking strength of the target monofilament, thereby avoiding affecting the flatness of the diaphragm support network.

In this embodiment, since the prefabricated support net is usually of a thin and soft structure, it will shrink sharply under high temperature conditions, thereby reducing the flatness of the support net. Therefore, in this application, different temperature gradients are adopted successively to gradually increase the shaping temperature. At the same time, a needle plate device is added, so that the width of the prefabricated support net shrinks under a certain tension, and then the shrinkage in the width direction of the support net is controlled, thereby ensuring the flatness requirements of the support net.

It should be noted that the difference in flatness is mainly caused by factors such as the difference in monofilament diameter, the difference in weaving tension, and the uneven shrinkage of heat setting. This will cause the pore size of the support net to be uneven, and then affect the internal resistance of the electrolytic cell. The flatness refers to the degree of unevenness of the fabric surface. (Reference standard FZ/T 01147-2018 Test method for flatness of textile fabrics)

Further, after the sizing treatment, the third sizing support net in S33 is subjected to hot-pressing treatment.

Specifically, the hot pressing treatment can be hot calendering treatment, the hot calendering temperature is 160-220°C, and the pressure is 4.0-8.0MPa. After the hot calendering treatment, the finished thickness of the support net can reach the preset support net thickness.

In this application, the finished thickness of the support net is processed by hot calendering, so that the preset thickness of the final support net to be obtained is 0.08-0.25mm, so that the prefabricated support net has good mesh aperture and porosity, thereby reducing the influence of the thickness of the electrolytic cell diaphragm support net on the physical strength of the diaphragm and the internal resistance of the electrolytic cell, thereby improving the electrolysis efficiency.

In some embodiments, when the pore size of the preset support net is 230-280 μm, the preset diameter of the target monofilament is 0.10-0.15 mm, and the preset thickness of the support net is 0.14-0.25 mm, the permeation resistance of the membrane support net can be reduced by more than 20 times, and the tensile breaking strength is above 450 N/5cm.

Specifically, the tensile breaking strength test standard refers to the determination of breaking strength and elongation at break in Part 1 of GB/T 3923.1-2013 Textile Fabric Tensile Properties.

In some embodiments, when the pore size of the preset support net is 190-230 μm, the preset diameter of the target monofilament is 0.09-0.14 mm, and the preset thickness of the support net is 0.15-0.25 mm, the permeation resistance of the membrane support net can be reduced by more than 20 times, and the tensile breaking strength is above 350 N/5cm.

In some embodiments, when the pore size of the preset support net is 150-200 μm, the preset diameter of the target monofilament is 0.08-0.13 mm, and the preset thickness of the support net is 0.12-0.24 mm, the permeation resistance of the membrane support net can be reduced by more than 15 times, and the tensile breaking strength is above 300 N/5cm.

In some embodiments, when the pore size of the preset support net is 100-150 μm, the preset diameter of the target monofilament is 0.05-0.10 mm, and the preset thickness of the support net is 0.08-0.18 mm, the permeation resistance of the membrane support net can be reduced by more than 10 times, and the tensile breaking strength is above 250 N/5cm.

Embodiment one:

A preparation method of an electrolyzer diaphragm supporting net is as follows:

S1-1: Dry, melt extrude, cool and draw fiber-grade special engineering resin material chips to obtain the target monofilament with a wire diameter of 0.14mm. The special engineering resin material is polyphenylene sulfide (PPS).

S1-2: After the support net is shaped, the aperture size of the finished product is 230-280 μm, and the warp density is determined to be 185 threads/10cm and the weft density is 190 threads/10cm. Arrange the warp density of the support mesh. The thickness of the reed sheet is selected to be 0.35mm, and the warp threads are arranged evenly and neatly according to a certain amplitude and position by using the reed; Plain fabric texture, woven into a prefabricated support net;

S1-3: Perform ultrasonic pickling treatment on the prefabricated support net in S1-2 to remove oil and dirt on the support net, improve the hydrophilicity of the prefabricated support net at the same time, and obtain an optimized prefabricated support net, thereby avoiding the free movement of electrolyte ions affected by the excessive internal resistance of the electrolytic cell.

S1-4: Perform heat setting treatment on the prefabricated support net optimized in S1-3. The temperature of the first heat setting treatment is controlled at 90-110°C to obtain the first shaped support net, and then the second heat setting treatment is performed on the first shaped support net, and the temperature of the second heat setting treatment is controlled at 140-150°C to obtain the second shaped support net, and then the third heat set treatment is performed on the second shaped support net, and the temperature of the third heat set treatment is controlled at 160-180 °C to obtain the third shaped support net.

In this process, the final temperature of heat setting is controlled at 140-200°C. On the one hand, it can eliminate the internal stress generated by the monofilament during stretching and weaving, so that the macromolecules can relax to a certain extent, improve the dimensional stability of the monofilament, and improve the physical properties of the monofilament.

S1-5: hot calendering treatment is performed on the third shaped supporting net in S1-4, and the finished thickness of the supporting net after calendering is 0.20mm.

The hot calendering temperature is 160-180°C, the pressure is 7.0-8.0MPa, the monofilament of the support net is flattened after hot calendering treatment, so that the thickness of the support net is further compressed, the thickness of the finished support net is reduced, the support net surface becomes smooth and clean, the diffuse reflection of light is reduced, the gloss is enhanced, and the penetration resistance of the diaphragm support net is reduced by more than 20 times. The air tightness reduces the internal resistance of the diaphragm support net and reduces energy consumption, thereby improving the electrolysis efficiency of the electrolyzer.

Embodiment two:

A preparation method of an electrolyzer diaphragm supporting net is as follows:

S2-1: Dry, melt extrude, cool and draw the fiber-grade special engineering resin material slices to obtain the target monofilament with a wire diameter of 0.10mm. The special engineering resin material is polyetheretherketone (PEEK)

S2-2: According to the shape of the support net, the aperture size of the finished product is 190-230 μm, the warp density is determined to be 230 threads/10cm and the weft density is 260 threads/10cm, and the warp density of the support mesh is arranged. The thickness of the reed blade is selected to be 0.30mm, and the warp threads are arranged evenly and neatly according to a certain amplitude and position by using the reed; Plain fabric texture, woven into a prefabricated support net;

S2-3: Perform ultrasonic pickling on the prefabricated support net in S2-2 to remove oil and dirt on the support net, improve the hydrophilicity of the prefabricated support net at the same time, and obtain an optimized prefabricated support net, thereby avoiding the free movement of electrolyte ions affected by the excessive internal resistance of the electrolytic cell.

S2-4: Perform heat setting treatment on the prefabricated support net optimized in S2-3. The temperature of the first heat setting treatment is controlled at 110-120°C to obtain the first shaped support net, and then the second heat setting treatment is performed on the first shaped support net, and the temperature of the second heat setting treatment is controlled at 160-180°C to obtain the second shaped support net. 0°C to obtain the third shaped support net.

During this process, the final temperature of heat setting is controlled at 180-200°C. On the one hand, it can eliminate the internal stress generated by the monofilament during stretching and weaving, so that the macromolecules can relax to a certain extent, improve the dimensional stability of the monofilament, and improve the physical properties of the monofilament.

S2-5: Perform hot calendering treatment on the third shaped support net in S2-4, and the thickness of the finished support net after calendering is 0.15mm.

The hot calendering temperature is 190-210°C, the pressure is 4.0-6.0MPa, the monofilament of the support net is flattened after hot calendering treatment, so that the thickness of the support net is further compressed, the thickness of the finished support net is reduced, the surface of the support net becomes smooth and clean, the diffuse reflection of light is reduced, the gloss is enhanced, and the penetration resistance of the diaphragm support net is reduced by more than 20 times. The airtightness of the net reduces the internal resistance of the diaphragm support net, reduces energy consumption, and improves the electrolysis efficiency of the electrolyzer.

Embodiment three:

A preparation method of an electrolyzer diaphragm supporting net is as follows:

S3-1: Dry, melt extrude, cool and draw fiber-grade special engineering resin material slices to obtain warp monofilaments with a diameter of 0.05mm and weft monofilaments with a diameter of 0.10mm. The special engineering resin material is polyetheretherketone (PEEK);

S3-2: According to the shape of the support net, the aperture size of the finished product is 110-130 μm, the warp density is determined to be 500 threads/10cm and the weft density is 400 threads/10cm, and the warp density of the support mesh is arranged. The thickness of the reed sheet is selected to be 0.13mm, and the warp threads are arranged evenly and neatly according to a certain amplitude and position by using the reed; Plain fabric texture, woven into a prefabricated support net;

S3-3: Perform ultrasonic pickling on the prefabricated support net in S3-2 to remove oil and dirt on the support net, improve the hydrophilicity of the prefabricated support net at the same time, and obtain an optimized prefabricated support net, thereby avoiding the free movement of electrolyte ions affected by the excessive internal resistance of the electrolytic cell.

S3-4: Perform heat setting treatment on the prefabricated support net optimized in S3-3. The temperature of the first heat setting treatment is controlled at 90-100°C to obtain the first shaped support net, and then the second heat setting treatment is performed on the first shaped support net. The temperature of the second heat setting treatment is controlled at 150-160°C to obtain the second shaped support net, and then the third heat set treatment is performed on the second shaped support net, and the temperature of the third heat set treatment is controlled at 170-180 °C to obtain the third shaped support net. During this process, the final temperature of heat setting is controlled at 170-180°C. On the one hand, it can eliminate the internal stress generated by the monofilament during stretching and weaving, so that the macromolecules can relax to a certain extent, improve the dimensional stability of the monofilament, and improve the physical properties of the monofilament.

S3-5: Carry out hot calendering treatment on the third shaped support net in S3-4, and the thickness of the finished support net after calendering is 0.10 mm.

The hot calendering temperature is 180-190°C, the pressure is 6.0-7.0MPa, and the monofilament of the support net is flattened after hot calendering treatment, so that the thickness of the support net is further compressed, reducing the thickness of the finished support net, the surface of the support net becomes smooth and clean, the diffuse reflection of light is reduced, and the gloss is enhanced. At the same time, the penetration resistance of the diaphragm support net is reduced by more than 10 times, and the tensile breaking strength is above 250N/5cm. The air tightness reduces the internal resistance of the diaphragm support net and reduces energy consumption, thereby improving the electrolysis efficiency of the electrolyzer.

Each embodiment in the present application is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. a preparation method of electrolyzer diaphragm supporting net, is characterized in that, described method comprises: S1: Perform monofilament forming processing on the preset fiber material to obtain multiple target monofilaments; the target monofilaments are monofilaments with a preset diameter; S2: Weaving a plurality of target monofilaments according to the aperture of the preset support mesh to obtain a prefabricated support mesh, the warp density and weft density of the prefabricated support mesh are determined based on the preset aperture of the support mesh; S3: Perform shaping treatment and hot-pressing treatment on the prefabricated support net in S2 to obtain a support net with a preset thickness. 2 . The method for preparing an electrolyzer diaphragm support net according to claim 1 , wherein the preset diameter of the target monofilament is 0.05-0.15 mm. 3 . 3 . The method for preparing an electrolyzer diaphragm support net according to claim 1 , wherein the preset support net has a pore size of 100-300 μm. 4 . 4 . The method for preparing an electrolyzer diaphragm support net according to claim 1 , wherein the pore diameter of the prefabricated support net is 120-360 μm. 5 . The method for preparing an electrolyzer diaphragm support net according to claim 1 , wherein the support net with a predetermined thickness has a thickness of 0.08-0.25 mm. 6 . 6. according to the preparation method of a kind of electrolyzer diaphragm supporting net described in any one of claim 1-5, it is characterized in that, described S1 step comprises: S11: Perform mixing pretreatment on the preset fiber material to obtain dry powder; S12: Melting the dry powder to obtain melt fibers; S13: cooling the melted fibers to obtain solidified fiber threads; S14: performing a drawing process on the solidified fiber thread to obtain the target monofilament. 7. according to the preparation method of a kind of electrolyzer diaphragm supporting net described in any one of claim 1-5, it is characterized in that, described S2 step comprises: S21: Warping the multiple monofilaments according to the warp density; S22: Perform weaving processing on the plurality of monofilaments according to the weft density to obtain the prefabricated support net. 8. according to the preparation method of a kind of electrolyzer diaphragm support net described in any one of claim 1-5, it is characterized in that, before described S3 step, also comprise ultrasonic pickling treatment to described prefabricated support net, obtain the prefabricated support net after optimization; The oil stain and dirt of the prefabricated support net are removed through the ultrasonic pickling treatment, and the hydrophilicity of the prefabricated support net is improved at the same time. 9. according to the preparation method of a kind of electrolyzer diaphragm support net described in any one of claim 1-5, it is characterized in that, the described sizing treatment in the described S3 step comprises: S31: Perform a first shaping process on the prefabricated support net according to a preset first temperature gradient to obtain a first shaped support net; S32: Perform a second shaping process on the first shaped support net according to a preset second temperature gradient to obtain a second shaped support net; S33: Perform a third shaping process on the second shaped support net according to a preset third temperature gradient to obtain a third shaped support net; The preset first temperature gradient is 90-120°C, the preset second temperature gradient is 120-150°C, and the preset third temperature gradient is 150-200°C. 10. according to the preparation method of a kind of electrolyzer diaphragm supporting net described in any one of claim 1-5, it is characterized in that, the hot pressing treatment in the described S3 step can be hot calendering treatment; The temperature of the hot calendering treatment is 160-220° C., and the pressure is 4.0-8.0 MPa.