CN114214770B - High-flatness reinforcing net for ion exchange membrane and application thereof - Google Patents

High-flatness reinforcing net for ion exchange membrane and application thereof Download PDF

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Publication number
CN114214770B
CN114214770B CN202111396798.2A CN202111396798A CN114214770B CN 114214770 B CN114214770 B CN 114214770B CN 202111396798 A CN202111396798 A CN 202111396798A CN 114214770 B CN114214770 B CN 114214770B
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filaments
ion exchange
net
flatness
reinforcing
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CN114214770A (en
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杨淼坤
杜建平
张江山
冯威
张永明
成琳
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Shandong Dongyue Polymer Material Co Ltd
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Shandong Dongyue Polymer Material Co Ltd
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D13/00—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft
    • D03D13/008—Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft characterised by weave density or surface weight
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D9/00—Open-work fabrics
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C15/00—Calendering, pressing, ironing, glossing or glazing textile fabrics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The invention belongs to the technical field of ion exchange membranes, and particularly relates to a high-flatness reinforcing net for an ion exchange membrane and application thereof. The high-flatness reinforcing net for the ion exchange membrane comprises warp yarns and weft yarns which are composed of polytetrafluoroethylene filaments and polyester filaments, wherein the diameters phi of the polytetrafluoroethylene filaments and the polyester filaments respectively meet the following conditions:where T represents the thickness value reached after calendering the reinforcing web. Through the improvement of warp yarn and weft yarn for the enhancement net, the enhancement net not only can meet the requirement of the ion membrane on strength, but also can provide a flat framework for the ion membrane base membrane, and improves the flatness of the ion exchange membrane.

Description

High-flatness reinforcing net for ion exchange membrane and application thereof
Technical Field
The invention belongs to the technical field of ion exchange membranes, and particularly relates to a high-flatness reinforcing net for an ion exchange membrane and application thereof.
Background
The ionic membrane body prepared by adopting the ion exchange resin has poor flexibility and low strength. In the practical installation and use process, the ion membrane is easy to damage due to external actions such as bending, stretching, vibration, fluid impact and the like. The ion membrane is generally reinforced by a reinforcing net with a certain aperture ratio. As described in U.S. p.no 4324606, U.S. p.no 4477321, CN 101780376B, CN103252169a, etc.
The enhancement net is an important way to increase the mechanical strength and the dimensional stability of the ion exchange membrane, if the enhancement net is to exert the framework supporting effect, the enhancement net needs to be embedded into the ion membrane matrix, if the enhancement net is only attached to the surface of the matrix, the stripping force between the enhancement net and the ion membrane matrix is smaller, and the enhancement net cannot normally exert the enhancement effect on the ion membrane matrix (such as US5252193 a), so the enhancement effect can be realized only by embedding the enhancement net into the matrix of the ion membrane.
In order to pursue larger aperture ratio and lower tank voltage of the existing perfluorinated ion exchange membrane for chlor-alkali industry, the reinforcing mesh is generally formed by mixed knitting of polytetrafluoroethylene filaments and polyester filaments. The reinforced net woven by the ultra-fine filaments can greatly reduce the mechanical strength of the reinforced net per se, thereby affecting the strength of the ion membrane, so that the reinforced net woven by the thicker filaments is required, and when the reinforced net is embedded into a membrane matrix to form the reinforced ion exchange membrane, pinholes, bubbles, unevenness and other anomalies are extremely easy to occur at the mesh position of the reinforced net, so that the defective rate is high, and therefore, when the thickness of the original reinforced net is larger, the thickness of the reinforced net needs to be reduced by means of calendaring and the like.
The thickness of the reinforced net after calendering is strictly required at present, if the acting force of a pressure-receiving roller is smaller when the reinforced net is calendered, the thickness of the reinforced net after calendering is still larger, at the moment, although the shape change of filaments in the reinforced net is small, the shape change of the original cylinder is small, the area of the ion film melt required to be coated is small, and the bonding between the net films is facilitated, but the number of pinholes generated by the ion film matrix is increased due to the relatively larger thickness. If the acting force of the pressure roller of the reinforcing net is bigger, the thickness of the reinforcing net is smaller after calendaring, at the moment, the morphology of filaments in the reinforcing net is changed greatly, the original cylindrical morphology is changed greatly, the shape tends to be flat, the area of the ion membrane melt required to be coated is large, the coating of the melt on the reinforcing net is unfavorable, so that the reinforcing effect of the reinforcing net on the ion membrane matrix is weakened, and meanwhile, the filaments in the reinforcing net are changed from cylindrical to flat, the aperture ratio of the reinforcing net is reduced, the ion conduction area is reduced, and the ion transmission performance of the ion membrane is unfavorable. It can be seen that accurate control of the thickness of the reinforcement web after calendering is critical.
In the calendering process, the surface effect of the reinforced net woven by two filaments is changed into uneven and wavy after the calendering treatment. This is because the polytetrafluoroethylene filaments of the reinforcing mesh for chlor-alkali ion exchange membranes have a diameter much greater than the diameter of the polyester filaments. If the diameter of the polyester filaments is larger, or the diameter of the polyester filaments is the same as or similar to that of the polytetrafluoroethylene filaments, on one hand, the polyester filaments are not beneficial to being rapidly dissolved in the preparation or use process of the ion membrane, the effect of increasing the aperture ratio of the reinforcing net is lost, and the ion conduction effective area of the ion membrane is not beneficial to being increased; on the other hand, if dissolved, a larger cavity space is built in the ionic membrane matrix, so that the mechanical strength of the ionic membrane is greatly reduced, and the long-term service life of the ionic membrane is not facilitated. Thus, there are also stringent requirements between the two filament diameters.
On the premise that the requirements of the ionic membrane on the thickness of the rolled reinforced net and the diameter between polytetrafluoroethylene filaments and polyester filaments are met, the acting force of a calender press roll only acts on the filaments interwoven with the polytetrafluoroethylene filaments, the contact point of the polyester filaments and the polyester filaments interwoven together is thin due to small wire diameter, the acting force of the press roll does not act on the contact point, and the polyester filaments interwoven together still remain the same, namely the original length; and the polytetrafluoroethylene filaments and polytetrafluoroethylene filaments which are interwoven together and the polytetrafluoroethylene filaments and polyester filaments which are interwoven together receive the Z-direction acting force from the compression roller (the direction perpendicular to the plane of the ion exchange membrane), and the mass of the original thickness spreads along the X and Y directions, so that the thickness is reduced. When the as-received filaments and the reduced thickness filaments are combined, the calendered reinforcing web may exhibit irregularities. If such reinforcing mesh is embedded in the ionic membrane matrix at this time, the overall flatness of the ionic membrane is adversely affected, thereby affecting the appearance and the service performance. There is therefore a need for a reinforcing mesh that ensures ionic membrane strength while maintaining a high degree of flatness after calendering.
Disclosure of Invention
The invention aims to provide a high-flatness reinforcing net for an ion exchange membrane and application thereof, aiming at the problem that the cloth surface effect of the existing reinforcing net is uneven after calendering. Through the improvement of warp yarn and weft yarn for the enhancement net, the enhancement net not only can meet the requirement of the ion membrane on strength, but also can provide a flat framework for the ion membrane base membrane, and improves the flatness of the ion exchange membrane.
The technical scheme of the invention is as follows: a highly flat reinforcing mesh for an ion exchange membrane comprising warp and weft yarns, each of the warp and weft yarns being composed of polytetrafluoroethylene filaments and polyester filaments, the diameters Φ of the polytetrafluoroethylene filaments and the polyester filaments respectively satisfying the following conditions:where T represents the thickness value reached after calendering the reinforcing web.
The diameter of polytetrafluoroethylene filaments in the high-flatness reinforced net for the ion exchange membrane is 50-100 mu m; the diameter of the polyester filament yarn is 20-45 mu m; the ratio of the thickness value of the reinforced net after calendaring treatment to the thickness of the ionic membrane matrix is (30-80): 100. when the thickness exceeds the upper limit value of the ratio, namely the acting force of a pressure roller of the enhancement net is smaller in the calendaring process, the shape change of filaments in the enhancement net is small, the shape change of the original cylinder is small, and the number of pinholes generated by the ionic membrane matrix in the process of coating the filaments can be increased; if the thickness is lower than the lower limit value of the ratio, namely the acting force of a pressure roller of the reinforcing net is larger in the calendaring process, the shape of filaments in the reinforcing net is changed greatly, the original cylinder shape is changed greatly, the shape tends to be flat, the area to be coated by the ion membrane melt is large, the coating of the ion membrane melt on the reinforcing net is unfavorable, so that the reinforcing effect of the reinforcing net on the ion membrane matrix is weakened, and meanwhile, the filaments in the reinforcing net are changed from cylindrical to flat, the aperture ratio of the reinforcing net is reduced, the ion conduction area is reduced, and the ion transfer performance of the ion membrane is unfavorable.
The thickness value of the reinforced net in the high-flatness reinforced net for the ion exchange membrane is 30-80 mu m after the reinforced net is calendared.
The weave structure of the warp yarns and the weft yarns in the high-flatness reinforcement net for the ion exchange membrane is at least one of plain weave, twill weave, satin weave or weave based on triple plain weave.
The weave structure of the warp yarn and the weft yarn in the high-flatness reinforced net for the ion exchange membrane is plain weave.
The polytetrafluoroethylene filaments and the polyester filaments in the high-flatness reinforced net for the ion exchange membrane are monofilaments or multifilaments.
The weaving density of polytetrafluoroethylene filaments and polyester filaments in the high-flatness reinforced net for the ion exchange membrane is 25-200 filaments/inch.
An ion exchange membrane employing a reinforcing mesh such as the highly flat reinforcing mesh described.
The application of the high-flatness reinforcing net in the ion exchange membrane.
The beneficial effects of the invention are as follows: the high-flatness reinforcing net for the ion exchange membrane solves the problem of unevenness generated after the thickness of the reinforcing net for the ion exchange membrane is thinned by improving the warp yarn and the weft yarn for the reinforcing net, and provides a flattening reinforcing net skeleton structure for the coating of an ion membrane matrix, so that a flattening ion exchange membrane can be obtained, and the appearance and the service performance of the ion membrane are improved.
Drawings
Fig. 1 is a schematic structural view of a high flatness reinforcing net according to the present invention.
Wherein 1 is the intersection point of PTFE filaments and PTFE filaments, 2 is the intersection point of PTFE filaments and PET filaments, and 3 is the intersection point of PET filaments and PET filaments.
Detailed Description
The present invention will be described in detail by way of examples. It is to be noted that the examples are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the invention, since many insubstantial modifications and variations of the invention will become apparent to those skilled in the art in light of the above disclosure.
Example 1
The high flatness reinforcement net for ion exchange membrane comprises warp yarn and weft yarn composed of Polytetrafluoroethylene (PTFE) filaments and Polyester (PET) filaments. The weave structure of the warp yarn and the weft yarn is plain weave, and the polytetrafluoroethyleneThe braiding density of the ethylene filaments is 25 filaments/inch, and the braiding density of the polyester filaments is 50 filaments/inch. The polytetrafluoroethylene filaments are monofilaments, and the polyester filaments are monofilaments. The polytetrafluoroethylene filaments have a diameter of 100 μm, the polyester filaments have a diameter of 45 μm, the thickness required to be reached after calendering the reinforcing web is 80 μm, at which point,and->Wherein T represents the thickness value required to be achieved after the reinforcing mesh is calendered, and the flatness of the reinforcing mesh is measured according to the standard GB/T13769 method to be SA-5. The reinforced net is applied to a molten polymer matrix coating film to obtain a flat reinforced ion exchange film.
Example 2
The high-flatness reinforcing net for the ion exchange membrane comprises warp yarns and weft yarns which are composed of polytetrafluoroethylene filaments and polyester filaments. The weave structure of the warp yarn and the weft yarn is plain weave, the weaving density of polytetrafluoroethylene filaments is 25 filaments/inch, and the weaving density of polyester filaments is 200 filaments/inch. The polytetrafluoroethylene filaments are monofilaments, and the polyester filaments are monofilaments. The polytetrafluoroethylene filaments have a diameter of 100 μm, the polyester filaments have a diameter of 20 μm, the thickness required to be reached after calendering the reinforcing web is 30 μm, at which point,and->Wherein T represents the thickness value required to be achieved after the reinforcing mesh is calendered, and the flatness of the reinforcing mesh is measured according to the standard GB/T13769 method to be SA-5. The reinforced net is applied to a molten polymer matrix coating film to obtain a flat reinforced ion exchange film.
Example 3
The high flatness enhancement for ion exchange membranesThe strong net comprises warp yarns and weft yarns which are composed of polytetrafluoroethylene filaments and polyester filaments. The weave structure of the warp yarn and the weft yarn is plain weave, the weave density of polytetrafluoroethylene filaments is 30 pieces/inch, and the weave density of polyester filaments is 60 pieces/inch. The polytetrafluoroethylene filaments are monofilaments, and the polyester filaments are multifilaments. The polytetrafluoroethylene filaments have a diameter of 50 μm, the polyester multifilament have a diameter of 20 μm, the thickness required to be reached after calendering the reinforcing web is 30 μm, in which case,and->Wherein T represents the thickness value required to be achieved after the reinforcing mesh is calendered, and the flatness of the reinforcing mesh is measured according to the standard GB/T13769 method to be SA-5. The reinforced net is applied to a molten polymer matrix coating film to obtain a flat reinforced ion exchange film.
Example 4
The high-flatness reinforcing net for the ion exchange membrane comprises warp yarns and weft yarns which are composed of polytetrafluoroethylene filaments and polyester filaments. The weave structure of the warp yarn and the weft yarn is plain weave, the weaving density of polytetrafluoroethylene filaments is 25 filaments/inch, and the weaving density of polyester filaments is 50 filaments/inch. The polytetrafluoroethylene filaments are monofilaments, and the polyester filaments are multifilaments. The polytetrafluoroethylene filaments have a diameter of 50 μm, the polyester multifilament have a diameter of 45 μm, the thickness required to be reached after calendering the reinforcing web is 80 μm, in which case,and->Wherein T represents the thickness value required to be achieved after the reinforcing mesh is calendered, and the flatness of the reinforcing mesh is measured according to the standard GB/T13769 method to be SA-5. The reinforcing net is applied to the film of the molten polymer matrix to obtain a flat reinforcing netStrong ion exchange membranes.
Example 5
The high-flatness reinforcing net for the ion exchange membrane comprises warp yarns and weft yarns which are composed of polytetrafluoroethylene filaments and polyester filaments. The weave structure of the warp yarn and the weft yarn is plain weave, the weaving density of polytetrafluoroethylene filaments is 25 filaments/inch, and the weaving density of polyester filaments is 100 filaments/inch. The polytetrafluoroethylene filaments are monofilaments, and the polyester filaments are monofilaments. The polytetrafluoroethylene filaments have a diameter of 70 μm, the polyester filaments have a diameter of 34 μm, the thickness required to be reached after calendering the reinforcing web is 60 μm, at which point,and->Wherein T represents the thickness value required to be achieved after the reinforcing mesh is calendered, and the flatness of the reinforcing mesh is measured according to the standard GB/T13769 method to be SA-5. The reinforced net is applied to a molten polymer matrix coating film to obtain a flat reinforced ion exchange film.
Example 6
The high-flatness reinforcing net for the ion exchange membrane comprises warp yarns and weft yarns which are composed of polytetrafluoroethylene filaments and polyester filaments. The weave structure of the warp yarn and the weft yarn is plain weave, the weaving density of polytetrafluoroethylene filaments is 25 filaments/inch, and the weaving density of polyester filaments is 50 filaments/inch. The polytetrafluoroethylene filaments are monofilaments, and the polyester filaments are multifilaments. The polytetrafluoroethylene filaments have a diameter of 80 μm, the polyester multifilament have a diameter of 20 μm, the thickness required to be reached after calendering the reinforcing web is 35 μm, at which point,and->Wherein T represents the thickness value required to be achieved after the calendering of the reinforcing web,the flatness rating of the reinforcing mesh was measured as SA-5 according to the standard GB/T13769 method. The reinforced net is applied to a molten polymer matrix coating film to obtain a flat reinforced ion exchange film.
Comparative example 1
The reinforcing net for the ion exchange membrane comprises warp yarns and weft yarns which are composed of polytetrafluoroethylene filaments and polyester filaments. The weave structure of the warp yarn and the weft yarn is plain weave, the weaving density of the PTFE filaments is 25 pieces/inch, and the weaving density of the terylene filaments is 50 pieces/inch. The polytetrafluoroethylene filaments are monofilaments, and the polyester filaments are monofilaments. The PTFE filaments have a diameter of 100. Mu.m, the polyester filaments have a diameter of 30. Mu.m, the thickness required to be reached after calendering the reinforcing web is 80. Mu.m, at which point,and->Wherein T represents the thickness value required to be achieved after the reinforcing mesh has been calendered, the reinforcing mesh has a flatness rating of SA-2 as measured by the standard GB/T13769 method, and the flatness is less than in example 1. The reinforced net is applied to a molten polymer matrix coating film to obtain an uneven ion exchange film.

Claims (7)

1. The high-flatness reinforcing net for the ion exchange membrane comprises warp yarns and weft yarns, wherein the warp yarns and the weft yarns are composed of polytetrafluoroethylene filaments and polyester filaments, and the high-flatness reinforcing net is characterized in that the diameters phi of the polytetrafluoroethylene filaments and the polyester filaments respectively meet the following conditions:，/>wherein T represents a thickness value obtained after the reinforcing web has been calendered, the thickness value being from 30 to 80 μm;
the diameter of the polytetrafluoroethylene filament is 50-100 mu m; the diameter of the polyester filament yarn is 20-45 mu m.
2. The high flatness reinforcement net for ion exchange membranes according to claim 1, wherein the weave structure of the warp and weft yarns is at least one of plain weave, twill weave, satin weave or weave based on triple prime weave.
3. The high flatness reinforcement net for ion exchange membranes according to claim 2, wherein the weave structure of the warp and weft yarns is a plain weave.
4. The high flatness reinforcement net for ion exchange membranes according to claim 1, wherein the polytetrafluoroethylene filaments and polyester filaments are monofilaments or multifilaments.
5. The high flatness reinforcement net for ion exchange membranes according to claim 1, wherein the weave density of polytetrafluoroethylene filaments and polyester filaments is 25-200 filaments/inch.
6. An ion exchange membrane, characterized in that a reinforcing mesh is used as claimed in any one of claims 1 to 5.
7. Use of a highly flattened reinforcing mesh in accordance with any one of claims 1-5 in ion exchange membranes.
CN202111396798.2A 2021-11-23 2021-11-23 High-flatness reinforcing net for ion exchange membrane and application thereof Active CN114214770B (en)

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Citations (1)

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Publication number Priority date Publication date Assignee Title
CN105401304A (en) * 2015-12-15 2016-03-16 张掖市西龙产业用纺织品有限公司 Single multifilament filter cloth and preparation method for same

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JPS568901Y2 (en) * 1975-07-23 1981-02-26
US4324606A (en) * 1979-12-27 1982-04-13 E. I. Du Pont De Nemours And Company Process for forming a reinforced membrane
US4477321A (en) * 1981-01-16 1984-10-16 E. I. Du Pont De Nemours And Company Sacrificial reinforcements in cation exchange membrane
JP2000256486A (en) * 1999-03-09 2000-09-19 Asahi Chem Ind Co Ltd Reinforced cation exchange membrane
WO2009093412A1 (en) * 2008-01-25 2009-07-30 Kuraray Co., Ltd. High-strength, high-elasticity modulus sheet-like article
CN101780376B (en) * 2009-12-07 2012-07-25 山东东岳高分子材料有限公司 Enforced screen cloth for fluorine-contained cation exchange membrane and application thereof
CN103252169A (en) * 2012-08-01 2013-08-21 上海金由氟材料有限公司 Enhanced net cloth for chlor alkali ion exchange membran
WO2020067175A1 (en) * 2018-09-26 2020-04-02 Ａｇｃ株式会社 Ion exchange membrane and electrolysis apparatus

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Publication number Priority date Publication date Assignee Title
CN105401304A (en) * 2015-12-15 2016-03-16 张掖市西龙产业用纺织品有限公司 Single multifilament filter cloth and preparation method for same

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