CN115126870A - ePTFE oil-proof sealing non-leakage gasket part for airplane, preparation method and application thereof - Google Patents
ePTFE oil-proof sealing non-leakage gasket part for airplane, preparation method and application thereof Download PDFInfo
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- CN115126870A CN115126870A CN202210701172.6A CN202210701172A CN115126870A CN 115126870 A CN115126870 A CN 115126870A CN 202210701172 A CN202210701172 A CN 202210701172A CN 115126870 A CN115126870 A CN 115126870A
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- expanded polytetrafluoroethylene
- hydrophobic
- oleophobic
- gasket
- eptfe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/108—Special methods for making a non-metallic packing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
Abstract
The invention discloses an ePTFE oil-resistant sealed leak-proof gasket part for an airplane, a preparation method and application of the gasket part, wherein the gasket part comprises a hydrophobic and oleophobic expanded polytetrafluoroethylene film layer, an adhesion layer is compounded on the periphery of one side of the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer, and the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer and the adhesion layer are covered by an anti-sticking isolation paper layer; the preparation method comprises the manufacturing of an expanded polytetrafluoroethylene membrane, the manufacturing of a hydrophobic and oleophobic expanded polytetrafluoroethylene membrane and the manufacturing of an ePTFE oil-resistant sealing and non-leakage gasket part for an airplane; the shim member is for use in an aircraft. Through the mode, the sealing gasket is used for sealing, wearing, corroding and gap filling, can meet the requirements of various aviation material specifications, reduces the user cost and saves the cost.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to an ePTFE (expanded polyethylene) oil-resistant sealing leakproof gasket part for an airplane, a preparation method and application of the gasket part.
Background
The material requirements for aircraft seals are very demanding and the interface between the leading edge of the wing and the fairing is subject to various mechanical forces and harsh environmental challenges, resulting in structural damage due to wear and corrosion.
In addition, fuel or other access covers are also subjected to similar mechanical stresses, and after repeated disassembly and assembly, the covers still need to be sealed and protected from the environment and foreign matter. Therefore, the selection of a suitable interface material is critical to aircraft production and operation.
There is usually a large difference between the plurality of large continuous cowlings and flaps, and in particular, manufacturing tolerances cause gaps between the cowlings and the mounting structure surface, which affects the life cycle
Common sealing materials comprise rubber asbestos pads, rubber pads, wound gaskets, aramid gaskets, asbestos pads, flexible graphite, polytetrafluoroethylene and the like, and are mainly used for sealing engineering pipelines at middle and low ends. As a sealing material, poor creep resistance limits its application in aerospace materials.
At present, the highly laminated GORE SKYFLEX material of the GORE Goll company in the USA can provide excellent sealing performance in gaps and irregular surfaces. But the material has most market share in China and other areas, the selling price reaches 8000 yuan/square meter, the cost is extremely high, and the development of the aircraft manufacturing industry in China is limited.
Disclosure of Invention
The invention mainly solves the technical problem of providing an ePTFE oil-resistant sealing non-leakage gasket part for an airplane, a preparation method and application of the gasket part, which can meet the specification requirements of various aviation materials, and the materials can solve the problems of OEM manufacturers and operators on joint surfaces, such as sealing, abrasion, corrosion and gap filling; the material and the die-cutting piece are light in weight, soft in material, free of solidification, easy to install and capable of effectively saving time, are usually used as a substitute for field forming sealing materials, can simplify the assembly process of an airplane, still maintain the protection performance after being disassembled and assembled for many times, and reduce the life cycle cost.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided an ePTFE oil resistant seal leak-tight gasket component for aircraft comprising:
a hydrophobic and oleophobic expanded polytetrafluoroethylene film layer;
the adhesion layer is compounded on the periphery of one side surface of the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer;
the anti-sticking isolation paper layer covers the adhesion layer and the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer;
the part of the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer combined with the adhesion layer is an adhesion area of the gasket component, and the central area of the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer is an action area of the gasket component.
In a preferred embodiment of the invention, the hydrophobic and oleophobic expanded polytetrafluoroethylene membrane comprises an expanded polytetrafluoroethylene membrane coated with a hydrophobic and oleophobic finishing agent, and is formed by overlapping a plurality of layers of hydrophobic and oleophobic expanded polytetrafluoroethylene membranes to form staggered nano-micro stereo pore groups.
In a preferred embodiment of the present invention, the pore diameter of the nano-micro stereo-pore group is in the range of 0.01 to 15 μm.
In a preferred embodiment of the present invention, the adhesion layer is an oil-resistant and aging-resistant pressure-sensitive adhesive ring.
In a preferred embodiment of the invention, the release barrier paper layer is a PET release film or paper.
In a preferred embodiment of the invention, the shape of the gasket member is a flat cylindrical shape, a rectangular parallelepiped shape or a shape of a profile.
In a preferred embodiment of the present invention, the adhesion area is further provided with mounting holes uniformly distributed. The mounting hole is assembled with a fuel tank hole of the airplane through a fastener to realize the sealing of the airplane fuel tank.
In a preferred embodiment of the invention, the pad member is a flexible member that can be bent at will.
In order to solve the technical problem, the invention adopts another technical scheme that: the preparation method of the oil-resistant sealed impermeable gasket component made of ePTFE for the airplane comprises the following steps:
(1) production of expanded polytetrafluoroethylene film:
mixing the polytetrafluoroethylene dispersion resin and the liquid extrusion aid in proportion, prepressing the mixture into a cylinder blank, preparing the cylinder blank into a sheet by a calendering method, removing the extrusion aid, stretching and heat setting to finally prepare the expanded polytetrafluoroethylene microporous film;
(2) manufacturing a hydrophobic and oleophobic expanded polytetrafluoroethylene membrane:
preparing for unreeling the expanded polytetrafluoroethylene microporous film, coating a hydrophobic and oleophobic finishing agent on the expanded polytetrafluoroethylene microporous film for waterproof treatment and oleophobic treatment, drying and curing at low temperature to modify the opening, and carrying out inspection test and rolling to obtain a hydrophobic and oleophobic expanded polytetrafluoroethylene film;
(3) manufacture of aircraft ePTFE oil resistant seal leak-tight gasket components:
preparing for unreeling the hydrophobic and oleophobic expanded polytetrafluoroethylene membrane, continuously rolling and wrapping the hydrophobic and oleophobic expanded polytetrafluoroethylene membrane into a multi-layer film-wrapping cylinder, axially cutting the multi-layer film-wrapping cylinder, re-hot pressing and shaping to eliminate internal stress,
Then compounding one side of the multi-layer material of the expanded polytetrafluoroethylene film with the pressure-sensitive adhesive tape, integrally forming, die-cutting and processing, removing the waste material of the pressure-sensitive adhesive tape, and finally finishing inspection, qualified finished product, packaging and delivery.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided the use of an ePTFE oil resistant seal impermeable gasket component for aircraft, the gasket component for use in an aircraft, comprising:
the gasket is used for contacting fuel oil and other aviation liquid oil, and can be used as a gasket for an aircraft fuel tank, an aircraft pipeline and a pipeline flange;
sealing and surface protection for the interface of the leading edge of the wing and the fairing;
the sealing device is used for sealing and surface protection of fuel oil port covers or maintenance port covers and the like which need to be assembled and disassembled for multiple times;
for providing sealing and surface protection at gaps and irregular surfaces between a plurality of successive cowls and flaps.
The invention has the beneficial effects that: the product has various shapes and different sizes, has wide engineering performance and can meet the requirements of various aviation material specifications;
in addition, as the material can be processed into various shapes, the trouble of reprocessing by users is saved, so that the material can be more widely applied to advanced equipment industries and other industries with high efficiency, and the user cost is further reduced;
the problems of sealing, abrasion, corrosion and gap filling of joint surfaces of an OEM manufacturer and an operator can be solved;
the aircraft sealing material has the advantages of light weight, soft material, no need of curing, easiness in installation and capability of effectively saving time, is usually used as a substitute for a field forming sealing material, and can simplify the aircraft assembly process;
after being disassembled and assembled for many times, the protective performance is still kept, the service life of the product exceeds that of a common product by 10 to 15, the life cycle cost is reduced, and the cost is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic structural view of a preferred embodiment of an aircraft ePTFE oil resistant seal leak-tight gasket member of the present invention;
FIG. 2 is a schematic illustration in partial cross-sectional view of another preferred embodiment of an aircraft ePTFE oil resistant seal leak-tight gasket member of the present invention;
the parts in the drawings are numbered as follows: 100. 200 parts of a hydrophobic and oleophobic expanded polytetrafluoroethylene film layer, 300 parts of an adhesion layer, 300 parts of an anti-adhesion isolation paper layer, 400 parts of an adhesion area, 500 parts of an action area, 600 parts of a mounting hole.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "front" and "back" and the like indicate orientations and positional relationships based on orientations and positional relationships shown in the drawings or orientations and positional relationships where the products of the present invention are conventionally placed in use, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature may be present on or under the second feature in direct contact with the first and second feature, or may be present in the first and second feature not in direct contact but in contact with another feature between them. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
Referring to fig. 1 to 2, an embodiment of the present invention includes:
an ePTFE oil resistant seal leak-tight gasket component for aircraft comprising: the periphery of one side of the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer 100 is compounded with an adhesion layer 200, and the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer 100 and the adhesion layer 200 are covered by an anti-sticking isolation paper layer 300.
The hydrophobic and oleophobic expanded polytetrafluoroethylene membrane is modified by the nano-micropore modification of the expanded polytetrafluoroethylene membrane: coating a hydrophobic and oleophobic finishing agent on the expanded polytetrafluoroethylene membrane for waterproof treatment and oleophobic treatment, and then drying, curing and modifying at low temperature to open pores to form a finer and relatively uniform staggered nano-micro stereo pore group, wherein the pore diameter range of the nano-micro stereo pore group is 0.01-15 mu m. The expanded polytetrafluoroethylene microporous film is subjected to nano-micropore modification technology treatment, namely surface oil-proof and water-proof treatment, to form a novel polymer material with a special function, and the modified novel expanded polytetrafluoroethylene microporous film material with a unique microporous structure is a hydrophobic and oleophobic expanded polytetrafluoroethylene film.
The adhesion layer 200 is an oil-resistant and aging-resistant pressure-sensitive rubber ring, and the structure of the pressure-sensitive rubber ring improves the use convenience and the operation efficiency; the anti-sticking isolation paper layer 300 is a PET anti-sticking film or paper, and the pressure-sensitive adhesive ring of the gasket component is protected by the PET anti-sticking film or paper before use by a client, so that the large-batch manufacturing is facilitated, and the storage, the transportation and the use by the client are facilitated.
The invention carries out modification treatment on nano-micropores on the surface of the expanded polytetrafluoroethylene microporous membrane to prepare the expanded polytetrafluoroethylene membrane with unique microstructure, such as porosity, high and low temperature environment resistance, firm bonding and combination, good chemical inertness, ultraviolet resistance, nonflammability and the like, and then the modified hydrophobic and oleophobic expanded polytetrafluoroethylene membrane is further bonded with pressure-sensitive adhesive to prepare the ePTFE (expanded polytetrafluoroethylene) oil-resistant sealing and non-leakage gasket part for the airplane.
The gasket member of the present invention may have various shapes, and may be in the form of a flat, thin cylinder, a rectangular parallelepiped, a profile, or the like, depending on the actual application.
The color of the pad members of the present invention may be of various colors such as black, white, red, green, etc.
The ePTFE oil-proof sealing non-leakage gasket part for the airplane is a flexible part and can be bent randomly even exceeding 360 degrees, and the gasket part has excellent performances of water resistance, dust resistance, oil resistance and environmental change resistance.
In the present invention, the portion where the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer 100 and the adhesion layer 200 are combined is the adhesion region 400 of the gasket member, and the central region of the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer 100 is the active region 500 of the gasket member.
Furthermore, the adhesion area 400 is further provided with mounting holes 600 which are uniformly distributed, and the mounting holes 600 are assembled with an oil tank hole of an airplane by using fasteners so as to realize a reliable sealing function of the airplane oil tank.
This expanded polytetrafluoroethylene membrane module macromolecular material is rich in elasticity and pliability, has the three-dimensional nanometer micropore network structure that microfiber connects and form, and the product has outstanding creep resistance and anti cold flow performance, and expanded polytetrafluoroethylene membrane roll-up laminated sheet has bigger tensile strength: thus, less deformation after compression (less thickness and width deformation) than other gaskets, a greater rate of bolt compression force can be maintained in use, providing more reliable sealing performance, especially under thermal cycling and higher temperature conditions.
Expanded polytetrafluoroethylene (ePTFE) membrane seals can withstand temperatures in the range of-269 ℃ to 315 ℃ (452 ° F to 600 ° F), making them useful in a variety of applications.
The expanded polytetrafluoroethylene membrane sealing product has less deformation after width compression, can avoid negative influence caused by the fact that the gasket is extruded into the product, improves the sealing reliability, is resistant to environmental aging, prolongs the service life, and reduces the maintenance cost of re-locking and replacing the gasket.
Unlike hard or filled tetrafluoro, this expanded polytetrafluoroethylene (ePTFE) membrane seal article can conform to common flange irregularities, such gaskets can avoid reworking the flange surface, expand the application range, and achieve extremely reliable sealing effects, thus making it easier to achieve trouble-free operation.
The price of the expanded polytetrafluoroethylene (ePTFE) membrane sealing sheet is 60-70% of the imported price, so that the manufacturing cost of customers can be further reduced, and the customer products have higher competitiveness.
The invention also relates to a preparation method of the ePTFE oil-resistant sealing leakage-free gasket part for the airplane, which comprises the following steps:
(1) production of expanded polytetrafluoroethylene film:
mixing the PTFE dispersion resin and the liquid extrusion aid in proportion, prepressing into cylinder blank, rolling to make the cylinder blank into sheet, removing the extrusion aid, stretching, and heat setting to obtain the final product.
(2) Manufacturing a hydrophobic and oleophobic expanded polytetrafluoroethylene membrane:
preparing for unreeling the expanded polytetrafluoroethylene microporous film, coating a hydrophobic and oleophobic finishing agent on the expanded polytetrafluoroethylene microporous film for waterproof treatment and oleophobic treatment, drying and curing at low temperature to modify the opening, and carrying out inspection test and rolling to obtain the hydrophobic and oleophobic expanded polytetrafluoroethylene film.
The expanded polytetrafluoroethylene film has smaller openings of nano-micro pores formed by fibers of the expanded polytetrafluoroethylene film after surface hydrophobic and oleophobic modification treatment, forms low surface energy, has better rain-proof, dust-proof and chemical liquid and oil leakage-proof sealing performances under a certain pressure difference working environment, can bear the corrosion of all substances within the range of pH value of 0-14 (except for molten alkali metal, sodium naphthalene solution and elemental fluorine, especially at high temperature), and has wider working temperature range of environmental use (-100 ℃ to +260 ℃).
(3) Manufacture of aircraft ePTFE oil resistant seal leak-tight gasket components:
preparing for unreeling the hydrophobic and oleophobic expanded polytetrafluoroethylene membrane, continuously rolling and wrapping the hydrophobic and oleophobic expanded polytetrafluoroethylene membrane into a multi-layer film-wrapping cylinder, axially cutting the multi-layer film-wrapping cylinder, re-hot pressing and shaping to eliminate internal stress,
Then compounding one side of the expanded polytetrafluoroethylene film multi-layer material with low surface energy with the pressure sensitive adhesive tape, integrally forming, die cutting and processing, then removing the waste material of the pressure sensitive adhesive tape, and finally finishing inspection, qualified finished products, packaging and delivery.
The production process has extremely high consistency and accuracy, so compared with other expanded polytetrafluoroethylene plate-shaped gaskets, the expanded polytetrafluoroethylene film sealing product has more uniform density distribution, and the sealing effect is more consistent and reliable.
Table 1: the technical performance indexes of the gasket part of the invention are as follows:
the invention further relates to the use of ePTFE for aircraft to seal against oil leakage of gasket components,
the hydrophobic and oleophobic expanded polytetrafluoroethylene film with low surface energy is wound and superposed to form an oleophobic multilayer sealing material, and the materials can be applied to different environments:
the position which can be contacted with fuel oil and other aviation liquid oil can be used as a sealing gasket of an aircraft fuel tank, an aircraft pipeline and a pipeline flange:
the sealing part can not be broken or collapsed under the huge pressure fluctuation of the pressure difference caused by the taking-off and landing or pitching acceleration of the airplane, still has enough strength and sealing surface, has good bonding compliance, can not be broken or collapsed to cause leakage, can resist the rapid change of ultraviolet/environment temperature and the aging of bromine oxygen, and further ensures the reliable sealing and the long-term sealing reliability of the airplane oil tank, the airplane pipeline, the pipeline flange and the like;
reliable sealing and surface protection of the interface of the leading edge of the wing and the fairing:
the gasket part has reliable sealing and surface protection, and can avoid structural damage caused by abrasion and corrosion of the joint surface of the wing leading edge and the fairing due to various mechanical forces and severe environment;
fuel flap or maintenance flap etc. need the position of many times dismouting:
the fuel oil port cover or other maintenance port covers can be subjected to mechanical pressure brought by a severe environment, the port cover still needs to be sealed and protected from the surface after being disassembled and assembled for many times, and the port cover is prevented from being corroded by the severe environment and foreign matters;
sealing and surface protection at gaps and irregular surfaces between a plurality of successive cowls and flaps:
there are often large differences between the multiple continuous cowls and flaps, particularly manufacturing tolerances that result in gaps between the cowls and the mounting structure, and the high degree of conformance of the product to gaps and irregular surfaces provides excellent sealing performance. Unlike other wet seal materials, the product material remains in place when subjected to pressure, does not extrude, provides reliable protection for the joint gap, and seals the place effectively against foreign objects, thus protecting the aircraft structure and surface anti-corrosive coatings from abrasion caused by deformation, vibration and fine foreign objects.
The gasket part has various shapes and different sizes, has wide engineering performance, meets the specification requirements of various aviation materials, and can solve the problems of sealing, abrasion, corrosion and gap filling of OEM manufacturers and operators on joint surfaces; the material and the die-cutting piece are light in weight, soft in material, free of solidification, easy to install and capable of effectively saving time, are usually used as a substitute for field forming sealing materials, can simplify the assembly process of an airplane, still maintain the protection performance after being disassembled and assembled for many times, and reduce the life cycle cost.
The oil-resistant, sealed and non-leakage gasket part made of ePTFE for the airplane, the preparation method and the application of the gasket part have the beneficial effects that:
the product has various shapes and different sizes, has wide engineering performance and can meet the requirements of various aviation material specifications;
in addition, as the material can be processed into various shapes, the trouble of reprocessing by users is saved, so that the material can be more widely applied to advanced equipment industries and other industries with high efficiency, and the user cost is further reduced;
the problems of sealing, abrasion, corrosion and gap filling of joint surfaces of an OEM manufacturer and an operator can be solved;
the aircraft sealing material has the advantages of light weight, soft material, no need of curing, easiness in installation and capability of effectively saving time, is usually used as a substitute for a field forming sealing material, and can simplify the aircraft assembly process;
after being disassembled and assembled for many times, the protective performance is still kept, the service life of the product exceeds that of a common product by 10 to 15, the life cycle cost is reduced, the cost is saved, the aircraft manufacturing industry in China has price advantage, the sealing performance is safe and reliable, the stable development is strong, and good economic benefit and social benefit are obtained for China.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An ePTFE oil resistant seal leak-tight gasket component for aircraft comprising:
a hydrophobic and oleophobic expanded polytetrafluoroethylene film layer;
the adhesion layer is compounded on the periphery of one side surface of the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer;
the anti-sticking isolation paper layer covers the adhesion layer and the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer;
the part of the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer combined with the adhesion layer is the adhesion area of the gasket part, and the central area of the hydrophobic and oleophobic expanded polytetrafluoroethylene film layer is the action area of the gasket part.
2. The ePTFE oil-resistant sealed impermeable gasket part for the aircraft according to claim 1, wherein the hydrophobic and oleophobic expanded polytetrafluoroethylene membrane comprises an expanded polytetrafluoroethylene membrane coated with a hydrophobic and oleophobic finishing agent, and is formed by stacking a plurality of layers of hydrophobic and oleophobic expanded polytetrafluoroethylene membranes to form a dislocated nano-micro stereo pore group.
3. The ePTFE (expanded polyethylene) oil-resistant, sealed and leakproof gasket member for the aircraft as set forth in claim 2, wherein the pore size of the nano-micro stereo-pore group is in a range of 0.01 to 15 μm.
4. An aircraft ePTFE oil resistant seal leak-proof gasket member in accordance with claim 1, wherein said adhesion layer is an oil resistant and aging resistant pressure sensitive adhesive ring.
5. An ePTFE oil resistant sealed leakproof gasket component for aircraft according to claim 1, wherein the release barrier paper layer is a PET release film or paper.
6. An ePTFE oil resistant seal impermeable gasket member for aircraft according to claim 1 wherein the gasket member is in the form of a thin flat cylinder, a rectangular parallelepiped or a profile.
7. The ePTFE oil-resistant sealing non-leakage gasket component for aircraft as claimed in claim 1, wherein the adhesion region is further provided with uniformly distributed mounting holes, and the mounting holes are assembled with an aircraft fuel tank hole through fasteners to realize aircraft fuel tank sealing.
8. An aircraft ePTFE oil resistant seal leak proof gasket member as set forth in claim 1 wherein the gasket member is a flexible member capable of being flexed.
9. A preparation method of an ePTFE oil-resistant sealing and leakage-free gasket part for an airplane is characterized by comprising the following steps:
(1) production of expanded polytetrafluoroethylene film:
mixing the polytetrafluoroethylene dispersion resin and the liquid extrusion aid in proportion, prepressing the mixture into a cylinder blank, preparing the cylinder blank into a sheet by a calendering method, removing the extrusion aid, stretching and heat setting to finally prepare the expanded polytetrafluoroethylene microporous film;
(2) manufacturing a hydrophobic and oleophobic expanded polytetrafluoroethylene membrane:
preparing for unreeling the expanded polytetrafluoroethylene microporous film, coating a hydrophobic and oleophobic finishing agent on the expanded polytetrafluoroethylene microporous film for waterproof treatment and oleophobic treatment, drying and curing at low temperature to modify the opening, and carrying out inspection test and rolling to obtain a hydrophobic and oleophobic expanded polytetrafluoroethylene film;
(3) manufacture of aircraft ePTFE oil resistant seal leak-tight gasket components:
preparing for unreeling the hydrophobic and oleophobic expanded polytetrafluoroethylene membrane, continuously rolling and wrapping the hydrophobic and oleophobic expanded polytetrafluoroethylene membrane into a multi-layer film-wrapping cylinder, axially cutting the multi-layer film-wrapping cylinder, re-hot pressing and shaping to eliminate internal stress,
Then compounding one side of the expanded polytetrafluoroethylene film multi-layer material with low surface energy with the pressure sensitive adhesive tape, integrally forming, die cutting and processing, then removing the waste material of the pressure sensitive adhesive tape, and finally finishing inspection, qualified finished products, packaging and delivery.
10. Use of an ePTFE oil resistant seal impermeable gasket component for aircraft, wherein the gasket component is for use in an aircraft, comprising:
the sealing gasket is used for contacting fuel oil and other aviation liquid oil, and can be used as a sealing gasket of an aircraft fuel tank, an aircraft pipeline and a pipeline flange;
sealing and surface protection for the interface of the leading edge of the airfoil and the fairing;
the sealing device is used for sealing and surface protection of fuel oil port covers or maintenance port covers and other positions needing to be disassembled and assembled for many times;
for providing sealing and surface protection at gaps and irregular surfaces between a plurality of successive cowlings and flaps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210701172.6A CN115126870A (en) | 2022-06-21 | 2022-06-21 | ePTFE oil-proof sealing non-leakage gasket part for airplane, preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210701172.6A CN115126870A (en) | 2022-06-21 | 2022-06-21 | ePTFE oil-proof sealing non-leakage gasket part for airplane, preparation method and application thereof |
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| CN115126870A true CN115126870A (en) | 2022-09-30 |
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| CN202210701172.6A Pending CN115126870A (en) | 2022-06-21 | 2022-06-21 | ePTFE oil-proof sealing non-leakage gasket part for airplane, preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404011A (en) * | 2022-10-31 | 2022-11-29 | 四川省众望科希盟科技有限公司 | Method for bonding aircraft box section and expanded polytetrafluoroethylene in medium environment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115404011A (en) * | 2022-10-31 | 2022-11-29 | 四川省众望科希盟科技有限公司 | Method for bonding aircraft box section and expanded polytetrafluoroethylene in medium environment |
| CN115404011B (en) * | 2022-10-31 | 2023-03-03 | 四川省众望科希盟科技有限公司 | Method for bonding aircraft box section and expanded polytetrafluoroethylene in medium environment |
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