CN111396556A - Method for generating sealing film sleeve - Google Patents
Method for generating sealing film sleeve Download PDFInfo
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- CN111396556A CN111396556A CN202010120066.XA CN202010120066A CN111396556A CN 111396556 A CN111396556 A CN 111396556A CN 202010120066 A CN202010120066 A CN 202010120066A CN 111396556 A CN111396556 A CN 111396556A
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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
- F16J15/14—Sealings between relatively-stationary surfaces by means of granular or plastic material, or fluid
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J127/00—Adhesives based on 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; Adhesives based on derivatives of such polymers
- C09J127/02—Adhesives based on 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; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J127/12—Adhesives based on 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; Adhesives based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09J127/18—Homopolymers or copolymers of tetrafluoroethene
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Abstract
A method for generating the sealing film sleeve at the joint of connecting part and connected part includes such steps as adding the sealing film material to organic solvent and adhesive, stirring to obtain sealing emulsion, coating the sealing emulsion on the joint between connecting part and connected part, putting the connecting part and connected part at a temp lower than the boiling point of organic solvent for volatilizing organic solvent, fixing the connection between connecting part and connected part, wrapping the non-sealing area between connecting part and connected part with aluminium foil and adhesive tape, and then coating sealing emulsion on the outer part of the joint of the connecting piece and the connected piece, placing the connecting piece and the connected piece into a baking box together for baking by adopting a gradient heating method to enable the sealing film material to be crosslinked into a film, and repeating the last two steps until a sealing film sleeve meeting the requirement is generated. The sealing membrane sleeve generated by the invention has high compactness, good sealing property, low sealing reject ratio, simple operation and improved work efficiency.
Description
Technical Field
The invention relates to a method for generating a sealing membrane sleeve, in particular to a method for generating a sealing membrane sleeve at the joint of a connecting piece and a connected piece, and belongs to the technical field of sealing membrane sleeve production.
Background
Sealing is a technical problem often faced during the production and use of many products, for example, in membrane separation technology, a number of sealing problems are involved in membrane modules.
Membrane separation is a new technology of separation that rises rapidly after the 60's of the 20 th century. The membrane separation technology has the functions of separation, concentration, purification and refining, and has the characteristics of high efficiency, energy conservation, environmental protection, simple molecular-level filtration and filtration process, easy control and the like, so the membrane separation technology is widely applied to the fields of food, medicine, biology, environmental protection, chemical industry, metallurgy, energy, petroleum, water treatment, electronics, bionics and the like, generates great economic benefit and social benefit, and becomes one of the most important means in the current separation science.
With the development of scientific technology and the transformation and upgrading of products, the quality requirements of organic solvents used in the production process are higher and higher in many industries, such as biomedicine, chemical engineering, semiconductor integrated circuits, new energy and the like, the traditional fractionation or adsorption dehydration mode cannot meet the requirement that the water content of the organic solvents is less than 100ppm, and the organic solvents are dehydrated by adopting membrane separation technologies such as molecular sieve membranes and the like, so that the organic solvents are popular due to large processing capacity, high purity of the processed solvents and low production cost.
In the prior art, the equipment for performing organic solvent dehydration treatment by using a molecular sieve membrane is mainly a tubular membrane component device, and the tubular membrane component device generally comprises a cylinder and a molecular sieve membrane tube, wherein the molecular sieve membrane tube is arranged in the cylinder, two ends of the molecular sieve membrane tube are inserted into a flower disc in the cylinder, one end of the molecular sieve membrane tube is closed, the other end of the molecular sieve membrane tube is connected to an air extractor, and pressure difference is formed between two sides of the tube wall of the molecular sieve membrane tube; the organic solvent to be treated enters the cylinder body through the inlet, the moisture in the organic solvent enters the molecular sieve membrane tube under the pushing of the pressure difference between the inside and the outside of the tube wall of the molecular sieve membrane tube, the organic solvent is separated from the organic solvent and then is removed from the molecular sieve membrane tube, and the organic solvent after the moisture is removed flows out from the outlet of the cylinder body, so that the dehydration treatment is completed.
The device for dehydrating the organic solvent by adopting the membrane separation technology, such as a tubular membrane component device, needs to keep the pressure difference or concentration difference between two sides of a membrane tube during production, and also relates to the high-purity organic solvent during the separation process, and the organic solvents have various varieties and most of the organic solvents have strong permeability, corrosion resistance, flammability and explosiveness, so when the membrane separation technology is adopted for dehydrating the organic solvent, high requirements are put forward on the sealing property of the joint of the related device and various aspects such as explosion resistance, flame retardance, antistatic property and the like.
Polytetrafluoroethylene (Teflon or PTFE), commonly known as "plastic king", is a high molecular compound polymerized from tetrafluoroethylene, has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-adhesiveness, electrical insulation and good aging resistance, when used as engineering plastics, can be made into polytetrafluoroethylene tubes, rods, belts, plates, films and the like, and is generally applied to corrosion-resistant pipelines, containers, pumps, valves with higher performance requirements and used for manufacturing corrosion-resistant and sealing materials of radars, high-frequency communication equipment, radio equipment and the like, such as:
in the utility model of an explosion-proof mechanism of a lithium ion power battery (application number 201721672347.6), a sealing film made of polyethylene protects an explosion-proof film;
in the invention patent of sealing method of cylindrical zinc-air battery (application No. 200910085971.X), the air electrode is produced by hot-pressing and shaping the powder formed by acetylene black or carbon black and low-pressure polyethylene or polytetrafluoroethylene which is used as a binder;
in a diaphragm valve (application number 201220036281.2), a layer of polytetrafluoroethylene material is compositely welded on one surface of a sealing diaphragm contacting a fluid medium, so that the requirement of various characteristics of the sealing diaphragm in the field of sanitary food and pharmaceutical industry is effectively met;
in the invention patent application of 'a production process of a high-pressure-resistant polytetrafluoroethylene insulator' (application number 201811605775.6), the insulator is prepared by preparing a component A consisting of melanin and dispersed polytetrafluoroethylene emulsion and a raw material B, and then baking, extruding, granulating and molding the component A and the raw material B.
The prior art shows that the polytetrafluoroethylene is widely applied in a plurality of fields, shows excellent explosion-proof, flame-retardant and antistatic performances and is suitable to be used as an explosion-proof, flame-retardant and antistatic sealing material on a molecular sieve membrane tube assembly.
The sealing of the existing tubular membrane component mainly adopts a sealing ring, namely, two ends of a membrane tube are inserted into flower discs at two ends of the membrane component, grooves are arranged on the flower discs, the sealing ring is arranged in the grooves and is compressed by a clamping ring, the clamping ring is compressed by a pressing plate, and the pressing plate is fixed with the flower discs through bolts, so that the sealing purpose is achieved.
Obviously, the method is suitable when the number of membrane tubes of the tubular membrane component is small, and problems are easily caused when the number of the membrane tubes is large, firstly, when the number of the membrane tubes is large, the sealing is difficult to maintain completely through the sealing ring, the installation requirement is high, and the sealing performance of each membrane tube is not suitable to be detected independently, so that problems are caused to the separation process and the separation quality, and the yield and the quality of products cannot be ensured.
In order to improve the sealing performance, in the prior art, some tubular membrane assemblies are also sleeved with shrinkage sealing sleeves at the joints of membrane tubes and flower discs and joints of the membrane tubes and the flower discs.
However, when the shrink seal sleeve shrinks and seals, gaps may be left for various reasons, and the sealing effect is affected; secondly, when the number of the membrane tubes is large, the sleeve-joint shrinkage sealing sleeve and the guarantee of the sealing performance of the sleeve-joint shrinkage sealing sleeve also have a plurality of problems, so that in the prior art, a coating process appears, namely, firstly, a sealing material is coated on a to-be-sealed position, then, the sealing material is solidified into a membrane through a certain material or chemical method, and the to-be-sealed position is sealed, for example:
in the invention patent application of long-acting bonded polytetrafluoroethylene copper-clad plate and a preparation method thereof (application number 201910724168.X), a polytetrafluoroethylene layer is prepared by sintering polytetrafluoroethylene powder with a shell-core structure, and single particles of the polytetrafluoroethylene powder with the shell-core structure sequentially comprise polytetrafluoroethylene particles, a coupling agent and polyether ether ketone from inside to outside;
in the invention patent application, a preparation method of a polyphenyl ester-polytetrafluoroethylene composite coating (application number 201710911149.9), evenly coating polyphenyl ester-polytetrafluoroethylene mixed emulsion on a glass slide, drying, and then carrying out heat treatment for 10-20 min in an oven at 300-400 ℃ to obtain the polyphenyl ester-polytetrafluoroethylene composite coating;
in the invention patent application "a TPU film for sealing an electronic component having high water resistance and a method for producing the same" (application No. 201711394026.9), the TPU film includes an inner surface layer, an intermediate layer and an outer surface layer which are laminated in this order; the outer surface layer comprises polyether polyurethane elastomer and polytetrafluoroethylene, and the TPU film is prepared by firstly forming a base film through melting and tape casting by a three-layer co-extrusion casting machine and then performing biaxial stretching and shaping;
in the invention patent application of polytetrafluoroethylene sheath for aerospace cable and preparation method thereof (application number 201910084793.2), the sheath containing polytetrafluoroethylene is mixed in an extrusion double-mold gap and extruded to obtain a polytetrafluoroethylene sheath tube; evaporating to remove the non-solid auxiliary agent in the polytetrafluoroethylene protective sleeve; and then immersing the polytetrafluoroethylene sheath tube in a water tank for cooling and solidifying to obtain the polytetrafluoroethylene sheath of the cable for aerospace.
The coating process method for sealing the position to be sealed by firstly coating the sealing material on the position to be sealed and then solidifying the sealing material into a film by a certain material or chemical method is considered, and the method can find that the sealing material is difficult to coat, the film forming effect is poor and the sealing effect is poor under the condition that the number of film tubes is large and the arrangement is dense.
Disclosure of Invention
In order to overcome the defects of the prior art, the embodiment of the invention provides a method for generating a sealing membrane sleeve, and aims to improve the sealing performance of the joint of a connecting piece and a connected piece, simplify the sealing operation steps, improve the working efficiency and reduce the sealing reject ratio.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a method for generating a sealing film sleeve at the joint of a connecting piece and a connected piece is characterized by comprising the following steps:
s1) adding the sealing membrane material into an organic solvent and a binder, and uniformly stirring to prepare sealing emulsion;
s2) smearing the sealing cream on the joint of a connecting piece and a connected piece, and connecting the connecting piece and the connected piece;
s3) placing the connecting piece and the connected piece which are connected together in an air-conditioning environment, and preliminarily fixing the connection of the connecting piece and the connected piece when the organic solvent volatilizes at the temperature lower than the boiling point of the organic solvent;
s4) wrapping and protecting the non-sealing area between the connecting piece and the connected piece by using aluminum foil paper and adhesive tape, then coating the sealing emulsion on the outer part of the joint of the connecting piece and the connected piece, and waiting for the organic solvent to volatilize;
s5) placing the connecting piece coated with the sealing emulsion and the connected piece into a baking box together, and baking by adopting a gradient heating method to enable the sealing film material to be crosslinked into a film;
s6) repeating the steps S4 and S5 according to the film thickness requirement of the sealing film sleeve until the sealing film sleeve meeting the required film thickness is generated.
Further, the sealing film material comprises polytetrafluoroethylene powder, and the particle size of the polytetrafluoroethylene powder is 60-100 microns.
Further, the sealing film material also comprises one or more of soluble polytetrafluoroethylene, fluorinated ethylene propylene copolymer powder and ethylene-tetrafluoroethylene copolymer powder, and the particle sizes of the fluorinated ethylene propylene copolymer powder and the ethylene-tetrafluoroethylene copolymer powder are both 60-100 microns.
Further, the sealing membrane material also comprises a skeleton additive, wherein the mass of the skeleton additive accounts for 1-10% of the total mass of the sealing membrane material.
Further, the skeleton additive is one or a combination of mica powder and ceramic powder.
Further, the organic solvent is one or a mixture of ethanol, acetone and cyclohexane.
Further, the coating is carried out by adopting a spraying or dipping method to coat the sealing emulsion, and the thickness of a coating layer coated on the sealing emulsion is 0.1-0.5 mm.
Further, the gradient temperature raising method is that the temperature is kept for 2 minutes at 20 ℃ per liter until the temperature is kept for 10 minutes at 180 ℃.
Furthermore, the thickness of the sealing film sleeve is 0.1-0.5 mm.
The invention has the beneficial effects and remarkable progress that:
1) according to the method for generating the sealing membrane sleeve, the sealing membrane material is dissolved in the organic solvent to prepare the sealing emulsion, then the sealing emulsion is coated at the joint of the connecting piece and the connected piece, and then the connecting piece and the connected piece are baked by volatilizing the organic solvent, so that the sealing membrane material in the sealing emulsion is crosslinked into a membrane to generate the sealing membrane sleeve;
2) the generation method of the sealing membrane sleeve provided by the embodiment of the invention is novel and unique, and comprises the steps of volatilizing the organic solvent at the temperature lower than the boiling point of the organic solvent, so that air holes are not generated due to the rapid evaporation of the organic solvent, and the compactness of the membrane sleeve is not influenced; baking by adopting a gradient heating method to gradually crosslink the high molecular material molecules in the sealing film material to form a compact sealing film sleeve with good elasticity;
3) the generation method of the sealing membrane sleeve provided by the embodiment of the invention is simple and practical, can greatly improve the working efficiency, reduce the labor intensity of operators, improve the sealing performance and ensure the product quality, and therefore, has great popularization and application values.
Drawings
To more clearly illustrate the technical solution of the present invention, the drawings used for the embodiments of the present invention will be briefly described below.
It should be apparent that the drawings in the following description are only drawings of some embodiments of the invention, and that other drawings can be obtained by those skilled in the art without inventive exercise, and the other drawings also belong to the drawings required by the embodiments of the invention.
Fig. 1 is a schematic flow chart of a method for generating a sealing membrane sleeve according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a tubular membrane in a tubular membrane module according to an embodiment of the present invention.
In the figure:
10-membrane tube, 20-end enclosure, 30-tubular connecting piece and 40-sealing membrane sleeve.
Detailed Description
In order to make the objects, technical solutions, advantages and significant progress 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 provided in the embodiments of the present invention, and it is obvious that all of the described embodiments are only some embodiments of the present invention, not all embodiments; 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 the terms "first," "second," and "again" (if present) and the like in the description and the claims of the present invention and the drawings of the embodiments of the present invention are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprises" and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
It is to be understood that in the description of the embodiments of the present invention, the terms "upper", "lower", "top", "bottom", and other indicative orientations and positions are only used based on the orientation and position relationship shown in the drawings of the embodiments of the present invention, and are used for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element in question must have a specific orientation, a specific orientation configuration and operation, and therefore, should not be taken as limiting the present invention.
In the present invention, unless otherwise specifically stated or limited, the terms "mounted," "connected," "fixed," and the like are to be understood broadly, and for example, may be fixedly connected, detachably connected, movably connected, or integrated; either directly or indirectly through intervening media, either internally or in any other relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It should be further noted that the following embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.
Examples
Fig. 1 shows a schematic flow chart of a method for generating a sealing film sleeve according to an embodiment of the present invention:
a method for generating a sealing film sleeve at the joint of a connecting piece and a connected piece comprises the following steps:
s1) adding the sealing membrane material into an organic solvent and a binder, and uniformly stirring to prepare sealing emulsion;
s2) applying the sealing cream on the joint of the connecting piece and the connected piece to connect the connecting piece and the connected piece;
s3) placing the connecting piece and the connected piece together in an air-conditioning environment, and preliminarily fixing the connection of the connecting piece and the connected piece when the organic solvent volatilizes at the temperature lower than the boiling point of the organic solvent;
s4) wrapping and protecting the non-sealing area between the connecting piece and the connected piece by using aluminum foil paper and adhesive tape, then coating sealing emulsion on the outer part of the connecting piece and the connected piece, and waiting for the organic solvent to volatilize;
s5) placing the connecting piece coated with the sealing emulsion and the connected piece into a baking box together, and baking by adopting a gradient heating method to make the sealing film material crosslinked into a film;
s6) repeating the steps S4 and S5 according to the film thickness requirement of the sealing film sleeve until the sealing film sleeve meeting the required film thickness is generated.
The method for generating the sealing membrane sleeve is mainly applied to the production of the sealing membrane sleeve of the connecting piece and the connecting piece capable of being baked at a temperature of more than 180 ℃, such as a molecular sieve membrane tube and the like.
The sealing film material mainly comprises Polytetrafluoroethylene (PTFE) powder, and the particle size of the PTFE powder is 60-100 μm.
The sealing membrane material can also comprise one or more of soluble Polytetrafluoroethylene (PFA), Fluorinated Ethylene propylene copolymer (FEP) powder, Ethylene-tetrafluoroethylene copolymer (ETFE) powder to meet the requirements of different connecting pieces and connected pieces on chemical stability and other physical and chemical properties of the sealing membrane sleeve, wherein the particle sizes of the Fluorinated Ethylene propylene copolymer powder and the Ethylene-tetrafluoroethylene copolymer powder are both 60-100 mu m.
In order to ensure that the sealing film sleeve cannot shrink or collapse in the baking crosslinking process, keep a smooth and complete shape and further ensure the sealing property of the sealing film sleeve, a skeleton additive can be added into the sealing film material, and the addition amount of the skeleton additive is 1-10% of the total mass percentage of the sealing film material.
As an alternative technical solution, the skeleton additive may be one or a combination of mica powder and ceramic powder; of course, under the premise of not influencing the physicochemical property of the sealing film sleeve, other materials can be selected as the skeleton additive, and the description is omitted.
The organic solvent can be selected from one or more of ethanol, acetone and cyclohexane, and other common organic solvents can be selected, as long as the sealing film material can be coated by a spraying or dipping method, and the thickness of the coating layer is generally kept between 0.1 mm and 0.5mm during coating.
In order to ensure the film forming quality, in this embodiment, a gradient heating method is adopted for baking, and the specific gradient heating method is to heat the film for 2 minutes at 20 ℃ and 10 minutes at 180 ℃.
The sealing film sleeve has a film thickness of 0.1 to 0.5 mm.
Since the thickness of each sealing coating material application is generally maintained between 0.1 mm and 0.5mm, the required film thickness can be achieved by repeating the steps S4 and S5 in order to achieve the required film thickness of the sealing film sleeve.
In order to better help understanding of the technical solutions provided by the embodiments of the present invention, the technical solutions of the present invention are described in detail by specific implementation and application, taking the generation of the sealing membrane sleeves at the joints of the membrane tubes and the end sockets, and the membrane tubes and the tubular connectors as an example when the tubular membrane module is manufactured according to the technical solutions provided by the present invention.
As shown in fig. 2, a schematic diagram of a tubular membrane structure in a tubular membrane module according to an embodiment of the present invention is shown:
the utility model provides a tubular membrane module, include barrel (not shown in the figure) and set up 1 at least tubular membrane structure in barrel (not shown in the figure), tubular membrane structure includes membrane pipe 10, head 20 and tubular connecting piece 30 set up respectively in the both ends of membrane pipe 10, membrane pipe 10 pegs graft with head 20, tubular connecting piece 30 respectively, and be provided with sealed membrane cover 40 on the outer wall of membrane pipe 10 and head 20 junction, also be provided with sealed membrane cover 40 on the outer wall of membrane pipe 10 and tubular connecting piece 30 junction, in order to realize membrane pipe 10 and head 20, the sealing connection of membrane pipe 10 and tubular connecting piece 30.
The sealing membrane casing 40 in the tubular membrane module can be produced by the following method:
s1) adding the sealing membrane material mainly containing polytetrafluoroethylene powder into the mixed solvent composed of ethanol, acetone and cyclohexane, and stirring uniformly to obtain sealing emulsion;
s2) coating the sealing emulsion on the joints of the membrane tube 10 and the end enclosure 20 and the membrane tube 10 and the tubular connecting piece 30, and connecting the membrane tube 10 with the end enclosure 20 and the tubular connecting piece 30;
s3) placing the membrane tube 10 after the step s2) together with the end socket 20 and the tube connecting piece 30 in an air-conditioning environment, and preliminarily fixing the connection of the membrane tube 10 with the end socket 20 and the tube connecting piece 30 when the mixed solvent volatilizes at the temperature lower than the boiling point of the mixed solvent;
s4) wrapping the non-sealing section in the middle of the membrane tube 10 with aluminum foil paper and adhesive tape for protection, then smearing sealing cream on the two ends of the membrane tube 10, the end socket 20 and the tubular connecting piece 30, wherein the smearing thickness is 0.25mm, and the mixed solvent in the sealing cream is volatilized;
s5) placing the membrane tube 10 coated with the sealing milk together with the end socket 20 and the tubular connecting piece 30 into a baking oven to be baked by adopting a gradient heating method, namely, keeping the temperature of 20 ℃ per liter for 2 minutes until the temperature reaches 180 ℃ for 10 minutes to ensure that the polytetrafluoroethylene powder in the sealing milk is crosslinked into a membrane;
s6) repeating the steps s4 and s5, thereby producing the sealing film sleeve 40 meeting the requirements.
In the process of generating the sealing film sleeve 40, one or more materials of PFA, FEP or ETFE powder with the particle size of 60-100 μm can be added into the sealing film material to obtain the sealing film sleeve 40 with slightly different chemical stability and other physical and chemical properties, so as to meet different sealing requirements.
In order to obtain a better appearance of the sealing membrane sleeve 40, ensure that the sealing membrane sleeve 40 does not shrink or collapse during the baking and crosslinking process, keep a smooth and complete appearance and further ensure the sealing performance of the sealing membrane sleeve, a framework additive such as one or two of mica powder or ceramic powder can be added into the sealing membrane material, the addition amount of the framework additive is 1-10% of the total mass percentage of the sealing membrane material, and the corresponding generation method of the sealing membrane sleeve 40 is the same as that when the sealing membrane material is only polytetrafluoroethylene powder, and is not repeated here.
As can be seen from this embodiment:
according to the method for generating the sealing membrane sleeve, provided by the embodiment of the invention, the sealing membrane material is dissolved in the organic solvent to prepare the sealing emulsion, then the sealing emulsion is coated at the joint of the connecting piece and the connected piece, and then the steps of volatilizing the organic solvent, baking the connecting piece and the connected piece and the like are carried out, so that the sealing membrane material powder in the sealing emulsion is crosslinked into a membrane to generate the sealing membrane sleeve, and the sealing membrane sleeve generated in the way has high density and good sealing property, the poor sealing rate of the joint of the connecting piece and the connected piece can be greatly reduced, and the sealing requirement of the connecting assembly is met;
in addition, the generation method of the sealing membrane sleeve provided by the embodiment of the invention is novel and unique, and comprises the steps of adopting the volatile organic solvent at the temperature lower than the boiling point of the organic solvent, so that air holes are not generated due to the rapid evaporation of the organic solvent, and the compactness of the membrane sleeve is not influenced; baking by adopting a gradient heating method to gradually crosslink the molecules of the high molecular materials in the sealing membrane material to form a series of innovative processes of a compact and good-elasticity sealing membrane sleeve, and the novel sealing membrane sleeve has unexpected technical effects;
meanwhile, the generation method of the sealing membrane sleeve provided by the embodiment of the invention is simple and practical, strong in operability and wide in application, can greatly improve the working efficiency, lightens the labor intensity of operators, improves the sealing performance of products, and ensures the quality of the products, so that the generation method has great popularization and application values.
During the description of the above description:
the description of the terms "this embodiment," "an embodiment of the invention," "as shown at … …," "further improved technical solution," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention; in this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example, and the particular features, structures, materials, or characteristics described, etc., may be combined or brought together in any suitable manner in any one or more embodiments or examples; moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined or combined by one of ordinary skill in the art without creating inconsistencies.
Finally, it should be noted that:
the above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same;
although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that various changes and modifications may be made, and equivalents may be substituted for elements thereof without departing from the scope of the embodiments of the present invention.
Claims (9)
1. A method for generating a sealing film sleeve at the joint of a connecting piece and a connected piece is characterized by comprising the following steps:
s1) adding the sealing membrane material into an organic solvent and a binder, and uniformly stirring to prepare sealing emulsion;
s2) smearing the sealing cream on the joint of a connecting piece and a connected piece, and connecting the connecting piece and the connected piece;
s3) placing the connecting piece and the connected piece which are connected together in an air-conditioning environment, and preliminarily fixing the connection of the connecting piece and the connected piece when the organic solvent volatilizes at the temperature lower than the boiling point of the organic solvent;
s4) wrapping and protecting the non-sealing area between the connecting piece and the connected piece by using aluminum foil paper and adhesive tape, then coating the sealing emulsion on the outer part of the joint of the connecting piece and the connected piece, and waiting for the organic solvent to volatilize;
s5) placing the connecting piece coated with the sealing emulsion and the connected piece into a baking box together, and baking by adopting a gradient heating method to enable the sealing film material to be crosslinked into a film;
s6) repeating the steps S4 and S5 according to the film thickness requirement of the sealing film sleeve until the sealing film sleeve meeting the required film thickness is generated.
2. The method of forming a sealing membrane sleeve of claim 1, wherein: the sealing film material comprises polytetrafluoroethylene powder, and the particle size of the polytetrafluoroethylene powder is 60-100 microns.
3. The method of forming a sealing membrane sleeve of claim 2, wherein: the sealing film material also comprises one or more of soluble polytetrafluoroethylene, fluorinated ethylene propylene copolymer powder and ethylene-tetrafluoroethylene copolymer powder, and the particle sizes of the fluorinated ethylene propylene copolymer powder and the ethylene-tetrafluoroethylene copolymer powder are both 60-100 mu m.
4. A method of forming a sealing membrane sleeve according to claim 2 or 3, wherein: the sealing film material further comprises a skeleton additive, and the mass of the skeleton additive accounts for 1-10% of the total mass of the sealing film material.
5. The method of forming a sealing membrane sleeve of claim 4, wherein: the skeleton additive is one or a composition of two of mica powder and ceramic powder.
6. The method of forming a sealing membrane sleeve of claim 1, wherein: the organic solvent is one or a mixture of ethanol, acetone and cyclohexane.
7. The method of forming a sealing membrane sleeve of claim 1, wherein: the coating is to coat the sealing emulsion by adopting a spraying or dipping method, and the thickness of a coating layer coated on the sealing emulsion is 0.1-0.5 mm.
8. The method of forming a sealing membrane sleeve of claim 1, wherein: the gradient heating method is that the temperature is kept for 2 minutes at 20 ℃ per liter until the temperature is kept for 10 minutes at 180 ℃.
9. The method of forming a sealing membrane sleeve of claim 1, wherein: the thickness of the sealing film sleeve is 0.1-0.5 mm.
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Citations (7)
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| CN110148699A (en) * | 2019-06-12 | 2019-08-20 | 扬州中锂新能源有限公司 | A kind of preparation process of the high-performance coating diaphragm of surface coating organic layer |
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| CN101541406A (en) * | 2007-07-03 | 2009-09-23 | 住友电工超效能高分子股份有限公司 | Flat-membrane element for filtration and flat-membrane filtration module |
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| CN102679057A (en) * | 2012-05-23 | 2012-09-19 | 深圳雅昌管业有限公司 | Process method for connecting metal-extrusion type pipe fitting with high infiltration prevention |
| CN204395736U (en) * | 2014-12-29 | 2015-06-17 | 浙江海天气体有限公司 | Multi-channel metal palladium-based composite membrane hydrogen gas segregator assembly |
| CN204684957U (en) * | 2015-04-17 | 2015-10-07 | 江苏久吾高科技股份有限公司 | A kind of tubular type inorganic membrane assembly |
| CN106065950A (en) * | 2016-08-03 | 2016-11-02 | 华南理工大学 | The encapsulating method of a kind of perovskite oxygen permeation membrane assembly and device |
| CN110148699A (en) * | 2019-06-12 | 2019-08-20 | 扬州中锂新能源有限公司 | A kind of preparation process of the high-performance coating diaphragm of surface coating organic layer |
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