CN111806010A - Polytetrafluoroethylene composite film - Google Patents

Polytetrafluoroethylene composite film Download PDF

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Publication number
CN111806010A
CN111806010A CN202010694398.9A CN202010694398A CN111806010A CN 111806010 A CN111806010 A CN 111806010A CN 202010694398 A CN202010694398 A CN 202010694398A CN 111806010 A CN111806010 A CN 111806010A
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material layer
polytetrafluoroethylene
polytetrafluoroethylene material
thickness
composite film
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CN202010694398.9A
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CN111806010B (en
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林玉泰
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XIAMEN VISBE ENVIRONMENTAL GROUP
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XIAMEN VISBE ENVIRONMENTAL GROUP
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/242—All polymers belonging to those covered by group B32B27/32
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/302—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

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Abstract

The invention discloses a polytetrafluoroethylene composite film, which comprises a first polytetrafluoroethylene material layer and a second polytetrafluoroethylene material layer which are closely attached through hot melting, wherein the second polytetrafluoroethylene material layer is prepared by adopting a melt extrusion molding process, and the sum of the thicknesses of the first polytetrafluoroethylene material layer and the second polytetrafluoroethylene material layer is less than 100 um. Compared with the existing polytetrafluoroethylene belt or polytetrafluoroethylene tube bundle and polytetrafluoroethylene coating for heat exchange, the composite film has the advantages of greatly reduced thickness, reduced material cost, high heat transfer coefficient, excellent chemical corrosion resistance and temperature resistance, and can resist the corrosion of chromic acid, hydrochloric acid, strong base, smoke gas with the temperature up to 150 ℃ and the like; the second polytetrafluoroethylene material layer is prepared by adopting a melt extrusion molding process, the ultra-micro pores in the layer are greatly reduced compared with a spraying mode, and the second polytetrafluoroethylene material layer is compact, airtight and watertight under a very thin condition, so that pitting corrosion caused by the fact that corrosive liquid cannot reach the surface of the base material directly without the ultra-micro pores can be avoided.

Description

Polytetrafluoroethylene composite film
Technical Field
The invention relates to the technical field of composite membranes, in particular to a polytetrafluoroethylene composite membrane.
Background
Compared with corrosion-resistant metal or alloy and dual-phase steel, the PTFE material has wide excellent chemical resistance between 40 ℃ below zero and 250 ℃, and compared with other non-metallic materials, such as PP, PVBF and other corrosion-resistant materials, the PTFE material also has excellent chemical resistance and temperature resistance. However, since the thermal conductivity of PTFE is 0.256W/(m.K), which is much smaller than that of stainless steel, the wall thickness is usually 1.5mm or more, and the PTFE material is expensive. In addition, PTFE itself has molecular inertness, which causes physical properties that it is not easily bonded to copper, steel, alloys, polystyrene, and the like, resulting in a PTFE film having a small adhesion to a heat conductive substrate and being easily peeled off. The surface of PTFE needs to be modified, so that the modified surface is firmly attached to the surface of the heat exchange base material through an adhesive.
The patent number CN201611253710.0 discloses a PTFE heat exchanger, which discloses that the material of PTFE heat exchange tube/tube bundle is PTFE, the wall thickness is usually larger than 1mm and above, the heat exchange effect is poor, and the price of the heat exchanger tube is high. The invention patent with the patent number of CN201810730221.2 discloses a preparation method of a modified polytetrafluoroethylene tube for a waste heat exchanger, which is characterized in that the surface layer of a base material is coated with anti-corrosion PTFE, the coating with the thickness of 50 microns is slightly anti-corrosion, the coating with the thickness of 80 microns is moderately anti-corrosion, and the coating with the thickness of 100 microns-500 microns is highly anti-corrosion. The PTFE to achieve high corrosion resistance should be above 100 microns. The spraying process is characterized in that the coating is usually easy to have ultramicropores, so that corrosive liquid can directly reach the surface of the base material through the ultramicropores to generate pitting corrosion, and the strategy is to increase the thickness of the coating, reduce the possibility that the corrosive liquid directly reaches the base material through the ultramicropores and reduce the pitting corrosion possibility. The invention patent with the patent number of CN201310671937.7 discloses a heat exchanger surface coating and a heat exchanger surface treatment method, the patent discloses a PTFE coating with the diameter of 20-30 microns, but the coating is manufactured by adopting a spraying mode, micro gaps exist in the coating, construction thickness is different, holes are easy to break, the spraying can be carried out only by spraying a larger space above a surface layer, and if the coating is a long and narrow channel, such as a channel with the inner diameter of 3.5 cm and the length of 2-11 m, the construction is extremely difficult.
In view of the above, there is a need to develop a composite film that can simultaneously solve the problems of temperature resistance, chemical corrosion resistance, low heat transfer coefficient, poor adhesion to the substrate, and avoiding pitting corrosion of the PTFE film.
Disclosure of Invention
In view of the above problems, the present invention provides a polytetrafluoroethylene composite film with good temperature resistance, good chemical corrosion resistance, high heat transfer coefficient, strong adhesion to the substrate, and capability of avoiding the pitting problem.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a polytetrafluoroethylene complex film, includes first polytetrafluoroethylene material layer and the second polytetrafluoroethylene material layer through the inseparable laminating of hot melt, the second polytetrafluoroethylene material layer adopt melting extrusion moulding technology to make, the thickness of first polytetrafluoroethylene material layer and second polytetrafluoroethylene material layer with be less than 100 um.
In one embodiment, both surfaces of the second layer of polytetrafluoroethylene material and both surfaces of the first layer of polytetrafluoroethylene material are unmodified surfaces. The non-bonding surface of the first polytetrafluoroethylene material layer of the composite film can be firmly bonded with a base material through an adhesive and is difficult to peel off after being modified.
In another embodiment, both surfaces of the second polytetrafluoroethylene material layer and the adhering surface of the first polytetrafluoroethylene material layer are non-modified surfaces, and the non-adhering surface of the first polytetrafluoroethylene material layer is a modified surface subjected to modification treatment. The composite film can be firmly bonded with a base material directly through an adhesive.
Further, the composite film also comprises a third polytetrafluoroethylene material layer which is closely attached to the other side of the second polytetrafluoroethylene material layer in a hot melting mode, and the thickness sum of the first polytetrafluoroethylene material layer, the second polytetrafluoroethylene material layer and the third polytetrafluoroethylene material layer is smaller than 100 um.
In one embodiment, both surfaces of the first layer of polytetrafluoroethylene material, both surfaces of the second layer of polytetrafluoroethylene material and both surfaces of the third layer of polytetrafluoroethylene material are unmodified surfaces. The non-attaching surface of the first polytetrafluoroethylene material layer and/or the third polytetrafluoroethylene material layer of the composite film can be firmly adhered to the base material through an adhesive and is difficult to peel off after modification treatment.
In another embodiment, the two surfaces of the second polytetrafluoroethylene material layer, the two surfaces of the third polytetrafluoroethylene material layer and the attaching surface of the first polytetrafluoroethylene material layer are all non-modified surfaces, and the non-attaching surface of the first polytetrafluoroethylene material layer is a modified surface subjected to modification treatment. The non-attaching surface of the first polytetrafluoroethylene material layer of the composite film can be directly and firmly bonded with the base material through the adhesive.
In yet another embodiment, the two surfaces of the second polytetrafluoroethylene material layer, the attachment surface of the first polytetrafluoroethylene material layer and the attachment surface of the third polytetrafluoroethylene material layer are all non-modified surfaces. And the non-attaching surface of the first polytetrafluoroethylene material layer and the non-attaching surface of the third polytetrafluoroethylene material layer are both modified surfaces which are subjected to modification treatment after melt extrusion. The non-attaching surface of the first polytetrafluoroethylene material layer and the non-attaching surface of the third polytetrafluoroethylene material layer of the composite film can be directly and firmly bonded with the base material through the adhesive.
Further, the thickness on first polytetrafluoroethylene material layer and third polytetrafluoroethylene material layer all is less than the thickness on second polytetrafluoroethylene material layer, the thickness on first polytetrafluoroethylene material layer and third polytetrafluoroethylene material layer is 3 ~ 30um, and the thickness on second polytetrafluoroethylene material layer is 12 ~ 70 um.
Preferably, the thickness of the first polytetrafluoroethylene material layer and the thickness of the third polytetrafluoroethylene material layer are both 3-10 um, and the thickness of the second polytetrafluoroethylene material layer is 12-40 um. When the thickness of the polytetrafluoroethylene material layer is reduced, the use requirement can be met, the production cost is greatly reduced, and the heat transfer coefficient is improved.
Further preferably, the thickness of the first polytetrafluoroethylene material layer and the thickness of the third polytetrafluoroethylene material layer are both 5-7 um, and the thickness of the second polytetrafluoroethylene material layer is 20-33 um. When the thickness of the polytetrafluoroethylene material layer is reduced, the use requirement can be met, the production cost is greatly reduced, and the heat transfer coefficient is improved.
The invention has the following beneficial effects:
1. the composite film has very high heat transfer coefficient, and when the thickness of the composite film is 90um, the heat transfer coefficient is approximately equal to 2844W/(m)2Deg.c); when the thickness of the composite film is 30 microns, the heat transfer coefficient is approximately equal to 8533W/(m)2.℃)。
2. The composite membrane inherits the excellent chemical corrosion resistance and temperature resistance of the PTFE material, and can resist the corrosion of chromic acid, hydrochloric acid, nitric acid, sulfuric acid, flue gas with the temperature as high as 150 ℃ and the like.
3. The second polytetrafluoroethylene material layer of the composite membrane is extruded by melting, the ultra-micro pores in the layer are greatly reduced compared with a spraying mode, and particularly, the second polytetrafluoroethylene material layer is compact, airtight and impervious under a very thin condition, so that pitting corrosion caused by the fact that corrosive liquid cannot directly reach the surface of a base material due to the fact that no ultra-micro pores exist can be avoided.
4. The non-binding face of the modified composite film is easily and firmly bound with the base material through an adhesive and is difficult to peel.
5. The composite membrane material has low cost, because the wall thickness (less than 100 microns) is greatly reduced compared with a PTFE catheter with the wall thickness of 1mm or more, and compared with a PTFE coating with the thickness of 100 microns or more, the material cost is also obviously reduced.
6. The composite membrane has extremely low transportation cost, and can be ignored compared with the material cost when being spread on a unit heat exchange area.
Drawings
Fig. 1 is a schematic structural diagram of a composite membrane according to the first embodiment.
Fig. 2 is a schematic structural diagram of the composite membrane of the second embodiment.
Fig. 3 is a schematic structural diagram of the composite membrane of example three.
Fig. 4 is a schematic structural view of the composite membrane of example four.
Fig. 5 is a schematic structural view of the composite film of example five.
Description of the main component symbols: 11. a first layer of polytetrafluoroethylene material; 12. a second layer of polytetrafluoroethylene material; 13. a third layer of polytetrafluoroethylene material; 10. and (5) modifying the surface.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example one
As shown in fig. 1, a ptfe composite film includes a first ptfe material layer 11 and a second ptfe material layer 12 which are closely attached by hot melting. The second polytetrafluoroethylene material layer 12 is prepared by a melt extrusion molding process, and the first polytetrafluoroethylene material layer 11 can be prepared by the melt extrusion molding process or by other processes such as spraying. The sum of the thicknesses of the first polytetrafluoroethylene material layer 11 and the second polytetrafluoroethylene material layer 12 is less than 100 um. Both surfaces of the first polytetrafluoroethylene material layer 11 and both surfaces of the second polytetrafluoroethylene material layer 12 are non-modified surfaces.
The thickness of first polytetrafluoroethylene material layer 11 is less than the thickness of second polytetrafluoroethylene material layer 12, and the thickness of first polytetrafluoroethylene material layer 11 is 3 ~ 30um, and the thickness of second polytetrafluoroethylene material layer 12 is 12 ~ 70 um.
Preferably, the thickness of the first polytetrafluoroethylene material layer 11 is 3-10 um, and the thickness of the second polytetrafluoroethylene material layer 12 is 12-40 um.
Further preferably, the thickness of the first polytetrafluoroethylene material layer 11 is 5-7 um, and the thickness of the second polytetrafluoroethylene material layer 12 is 20-33 um.
The non-adhering surface of the first polytetrafluoroethylene material layer 11 of the composite film of the embodiment can be firmly adhered to the substrate by an adhesive and is difficult to peel off after being modified.
Example two
As shown in fig. 2, the present embodiment is different from the first embodiment only in that: the two surfaces of the second polytetrafluoroethylene material layer 12 and the attaching surface of the first polytetrafluoroethylene material layer 11 are both non-modified surfaces, and the non-attaching surface of the first polytetrafluoroethylene material layer 11 is a modified surface 10 subjected to modification treatment. The rest of the structure of the present embodiment is the same as that of the first embodiment.
The non-adhering surface of the first polytetrafluoroethylene material layer 11 of the composite film of the embodiment can be directly and firmly adhered to the substrate through an adhesive, and is difficult to peel.
EXAMPLE III
As shown in fig. 3, the present embodiment is different from the first embodiment only in that: the polytetrafluoroethylene composite film also comprises a third polytetrafluoroethylene material layer 13 which is closely attached to the other surface of the second polytetrafluoroethylene material layer 12 in a hot melting mode, and the thickness sum of the first polytetrafluoroethylene material layer 11, the second polytetrafluoroethylene material layer 12 and the third polytetrafluoroethylene material layer 13 is less than 100 um. Both surfaces of the third polytetrafluoroethylene material layer 13 are non-modified surfaces. The thickness of the third polytetrafluoroethylene material layer 13 is 3-30 um.
Preferably, the thickness of the third polytetrafluoroethylene material layer 13 is 3-10 um.
Further preferably, the thickness of the third polytetrafluoroethylene material layer 13 is 5-7 um.
The rest of the structure of the present embodiment is the same as that of the first embodiment.
The non-adhering surface of the first polytetrafluoroethylene material layer 11 and/or the non-adhering surface of the third polytetrafluoroethylene material layer 13 of the composite film of the embodiment can be firmly adhered to the substrate and hardly peeled off by an adhesive after being modified.
Example four
As shown in fig. 4, the present embodiment is different from the third embodiment only in that: the non-adhering surface of the first polytetrafluoroethylene material layer 11 is a modified surface 10 subjected to modification treatment. The rest of the structure of the embodiment is the same as that of the embodiment.
The non-adhering surface of the first polytetrafluoroethylene material layer 11 of the composite film of the embodiment can be directly and firmly adhered to the substrate through an adhesive, and is difficult to peel.
EXAMPLE five
As shown in fig. 5, the present embodiment is different from the third embodiment only in that: the non-adhering surface of the first polytetrafluoroethylene material layer 11 and the non-adhering surface of the third polytetrafluoroethylene material layer 13 are both modified surfaces 10 which are subjected to modification treatment after melt extrusion. The rest of the structure of the embodiment is the same as that of the embodiment.
The non-adhering surface of the first polytetrafluoroethylene material layer 11 and the non-adhering surface of the third polytetrafluoroethylene material layer 13 of the composite film of the embodiment can be directly and firmly adhered to the substrate through the adhesive, and are difficult to peel.
The composite film prepared by the five embodiments has good temperature resistance and chemical corrosion resistance, and can resist the corrosion of chromic acid, hydrochloric acid, nitric acid, sulfuric acid, smoke gas with the temperature as high as 150 ℃ and the like. The heat transfer coefficient of the composite membrane is high (the lower the total thickness of the composite membrane is, the higher the heat transfer coefficient is), and when the composite membrane is applied to a heat exchanger, the heat exchange effect is good, and the integral manufacturing cost of the heat exchanger can be greatly reduced. The composite film has strong adhesive force with the base material and is difficult to peel. Can avoid the problem of pitting corrosion and avoid the pitting corrosion caused by the corrosion liquid directly reaching the surface of the base material, and has long service life.
The invention is not limited to the above five embodiments, and the composite film may also be formed by mutually hot-melting and tightly attaching a plurality of polytetrafluoroethylene material layers, and the principle is the same, and the details are not repeated here.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A polytetrafluoroethylene composite membrane characterized by: including the first polytetrafluoroethylene material layer and the second polytetrafluoroethylene material layer that closely laminate through the hot melt, the second polytetrafluoroethylene material layer adopt melting extrusion moulding technology to make, the thickness of first polytetrafluoroethylene material layer and second polytetrafluoroethylene material layer and be less than 100 um.
2. The polytetrafluoroethylene composite membrane according to claim 1, wherein: and both surfaces of the second polytetrafluoroethylene material layer and both surfaces of the first polytetrafluoroethylene material layer are non-modified surfaces.
3. The polytetrafluoroethylene composite membrane according to claim 1, wherein: the double surfaces of the second polytetrafluoroethylene material layer and the attaching surface of the first polytetrafluoroethylene material layer are both non-modified surfaces, and the non-attaching surface of the first polytetrafluoroethylene material layer is a modified surface subjected to modification treatment.
4. The polytetrafluoroethylene composite membrane according to claim 1, wherein: still include the third polytetrafluoroethylene material layer that closely laminates with the another side hot melt of second polytetrafluoroethylene material layer, the thickness of first polytetrafluoroethylene material layer to third polytetrafluoroethylene material layer and be less than 100 um.
5. The polytetrafluoroethylene composite membrane according to claim 4, wherein: and the double surfaces of the first polytetrafluoroethylene material layer, the second polytetrafluoroethylene material layer and the third polytetrafluoroethylene material layer are all non-modified surfaces.
6. The polytetrafluoroethylene composite membrane according to claim 4, wherein: the double surfaces of the second polytetrafluoroethylene material layer, the third polytetrafluoroethylene material layer and the attaching surface of the first polytetrafluoroethylene material layer are non-modified surfaces, and the non-attaching surface of the first polytetrafluoroethylene material layer is a modified surface subjected to modification treatment.
7. The polytetrafluoroethylene composite membrane according to claim 4, wherein: the double surfaces of the second polytetrafluoroethylene material layer, the attaching surface of the first polytetrafluoroethylene material layer and the attaching surface of the third polytetrafluoroethylene material layer are non-modified surfaces, and the non-attaching surface of the first polytetrafluoroethylene material layer and the non-attaching surface of the third polytetrafluoroethylene material layer are modified surfaces after melt extrusion.
8. The polytetrafluoroethylene composite membrane according to claim 4, wherein: the thickness on first polytetrafluoroethylene material layer and third polytetrafluoroethylene material layer all is less than the thickness on second polytetrafluoroethylene material layer, the thickness on first polytetrafluoroethylene material layer and third polytetrafluoroethylene material layer is 3 ~ 30um, and the thickness on second polytetrafluoroethylene material layer is 12 ~ 70 um.
9. The polytetrafluoroethylene composite membrane according to claim 8, wherein: the thickness of first polytetrafluoroethylene material layer and third polytetrafluoroethylene material layer is 3 ~ 10um, and second polytetrafluoroethylene material layer thickness is 12 ~ 40 um.
10. The polytetrafluoroethylene composite membrane according to claim 9, wherein: the thickness of first polytetrafluoroethylene material layer and third polytetrafluoroethylene material layer is 5 ~ 7um, and second polytetrafluoroethylene material layer thickness is 20 ~ 33 um.
CN202010694398.9A 2020-07-17 2020-07-17 Polytetrafluoroethylene composite film suitable for heat exchanger Active CN111806010B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85103426A (en) * 1985-04-27 1985-10-10 兵器工业部第二零七研究所 Metal-polytetrafluoroethylene tubular heating device and manufacture method thereof
US5264276A (en) * 1992-04-06 1993-11-23 W. L. Gore & Associates, Inc. Chemically protective laminate
CN1078802A (en) * 1993-03-19 1993-11-24 张留刚 Heat exchanger with teflon-metal composite
US5374473A (en) * 1992-08-19 1994-12-20 W. L. Gore & Associates, Inc. Dense polytetrafluoroethylene articles
CN1266397A (en) * 1997-08-07 2000-09-13 纳幕尔杜邦公司 Paste extrusion method
CN102333572A (en) * 2008-12-29 2012-01-25 德瓦尔工业公司 Chemical barrier lamination and method
CN103210276A (en) * 2010-10-04 2013-07-17 Oasys水有限公司 Thin film composite heat exchangers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN85103426A (en) * 1985-04-27 1985-10-10 兵器工业部第二零七研究所 Metal-polytetrafluoroethylene tubular heating device and manufacture method thereof
US5264276A (en) * 1992-04-06 1993-11-23 W. L. Gore & Associates, Inc. Chemically protective laminate
US5374473A (en) * 1992-08-19 1994-12-20 W. L. Gore & Associates, Inc. Dense polytetrafluoroethylene articles
CN1078802A (en) * 1993-03-19 1993-11-24 张留刚 Heat exchanger with teflon-metal composite
CN1266397A (en) * 1997-08-07 2000-09-13 纳幕尔杜邦公司 Paste extrusion method
CN102333572A (en) * 2008-12-29 2012-01-25 德瓦尔工业公司 Chemical barrier lamination and method
CN103210276A (en) * 2010-10-04 2013-07-17 Oasys水有限公司 Thin film composite heat exchangers

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