CN117467172A - Acoustic waterproof sound-permeable breathable film - Google Patents
Acoustic waterproof sound-permeable breathable film Download PDFInfo
- Publication number
- CN117467172A CN117467172A CN202311320957.XA CN202311320957A CN117467172A CN 117467172 A CN117467172 A CN 117467172A CN 202311320957 A CN202311320957 A CN 202311320957A CN 117467172 A CN117467172 A CN 117467172A
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- China
- Prior art keywords
- polytetrafluoroethylene
- film
- acoustic
- breathable film
- paste
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- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 33
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 33
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 30
- 238000001125 extrusion Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 21
- 229920000295 expanded polytetrafluoroethylene Polymers 0.000 claims abstract description 12
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000006185 dispersion Substances 0.000 claims abstract description 8
- 239000011347 resin Substances 0.000 claims abstract description 8
- 229920005989 resin Polymers 0.000 claims abstract description 8
- 239000002270 dispersing agent Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 5
- 238000005245 sintering Methods 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000002904 solvent Substances 0.000 claims abstract description 4
- 239000012982 microporous membrane Substances 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 12
- 239000011148 porous material Substances 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims description 8
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 5
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 5
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 4
- 125000005907 alkyl ester group Chemical group 0.000 claims description 4
- 229920000570 polyether Polymers 0.000 claims description 4
- 229920002545 silicone oil Polymers 0.000 claims description 4
- 238000004078 waterproofing Methods 0.000 claims 6
- 230000004888 barrier function Effects 0.000 abstract description 4
- 230000002457 bidirectional effect Effects 0.000 abstract 1
- 238000005056 compaction Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000001338 self-assembly Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B29D7/01—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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention discloses an acoustic waterproof sound-transmitting and breathable film, which is characterized in that the aperture of an ePTFE film is 50-100nm, the thickness is 10 mu m, the surface nodes are uniform, the film is made of a polytetrafluoroethylene microporous film through a stretching pore-forming method, the process core is extrusion molding, stretching pore-forming and sintering fixation, the film is made through the steps of uniformly mixing raw material polytetrafluoroethylene dispersion resin and an auxiliary agent according to a certain proportion to prepare polytetrafluoroethylene paste, putting the paste into a die to obtain a blank slightly smaller than a barrel of an extruder and uniformly dispersed solvent oil through a certain pressure compaction, putting the blank into an extruder, adjusting the extrusion temperature and speed to extrude all the blanks to obtain extrusion rods, rolling the extrusion rods on a double-roller calender to form a film, preparing the polytetrafluoroethylene microporous film through unidirectional or bidirectional stretching under a heating condition, putting the polytetrafluoroethylene microporous film into a nitrogen environment, and removing a dispersing agent to obtain the EPTFE microporous film under a sterile condition; the invention has the advantages of uniform aperture and good barrier property.
Description
Technical Field
The invention belongs to the technical field of manufacturing of ePTFE films, and particularly relates to an acoustic waterproof sound-transmitting breathable film.
Background
The EPTFE film is a high-performance film material, is fully called as an expanded polytetrafluoroethylene film, is prepared by carrying out physical stretching and expanding treatment on Polytetrafluoroethylene (PTFE), has excellent chemical stability and corrosion resistance, can bear extreme temperature and chemical environment, can be used in the range of-200 ℃ to +260 ℃, has barrier property, can effectively block permeation of gas, moisture and chemical substances, has excellent wear resistance, tearing resistance and ageing resistance, can keep the performance unchanged under long-time use conditions, and is widely applied to the fields of construction, chemical industry, medical treatment, electronics and the like.
The common EPTFE membrane is limited by materials and preparation processes, has non-uniform relative pore diameter and non-ideal barrier performance effect, and the conventional EPTFE preparation method mainly comprises the following steps: the semi-crosslinking agent method, the heat treatment method, the mechanical stretching method, the self-assembly method and the like, but the preparation processes have the defects of complex process, low separation efficiency, poor oxidation resistance and the like, and the prepared EPTFE film has short service life and poorer functions of water resistance, sound transmission, air permeability and the like.
Disclosure of Invention
The invention aims to provide an acoustic waterproof sound-transmitting breathable film for solving the problems that the EPTFE film is limited by materials and preparation processes, the aperture is uneven, the barrier performance effect is not ideal and the like.
The invention realizes the above purpose through the following technical scheme: the pore diameter of the ePTFE membrane is 50-100nm, the thickness is 10 mu m, the surface nodes are uniform, the ePTFE membrane is prepared by a stretching pore-forming method, and the process core comprises extrusion molding, stretching pore-forming and sintering fixation.
Further, the pore diameter of the polytetrafluoroethylene microporous membrane is 0.02-0.05 mu m, and the thickness is 15-100 mu m, and the microporous membrane is prepared by the following steps:
s1: uniformly mixing raw material polytetrafluoroethylene dispersion resin and an auxiliary agent in a certain proportion to prepare polytetrafluoroethylene paste;
s2: putting the paste into a die, compacting the paste under a certain pressure to obtain a blank slightly smaller than the oil of a charging barrel and a solvent of an extruder and uniformly dispersing the paste;
s3: putting the blanks into an extruder, adjusting the extrusion temperature and speed to extrude all the blanks, and obtaining an extrusion rod;
s4: the extrusion rod is placed on a double-roller calender to be rolled into a film shape, and the film is stretched unidirectionally or bidirectionally under the heating condition to prepare the polytetrafluoroethylene microporous film.
In the step S1, the auxiliary agent can be one of polyether silicone oil, fluorinated alkyl ester, polytetrafluoroethylene, carboxymethyl cellulose and the like.
Preferably, polyether silicone oils are used in combination with polytetrafluoroethylene or carboxymethyl cellulose, and fluorinated alkyl esters are used in combination with polytetrafluoroethylene or carboxymethyl cellulose.
In the step S1, the proportion of the polytetrafluoroethylene dispersion resin to the auxiliary agent is 5:0.8-1.3.
Preferably, when the ratio of the polytetrafluoroethylene dispersion resin to the auxiliary agent is 5:1.1, the PTFE film of the finished product has better extensibility and is favorable for stretching and pore forming.
In the step S3, the extrusion temperature is 280-380 ℃.
As preferable: the efficiency is highest at the extrusion temperature of 350 ℃, and the physical and chemical properties of the PTFE film are best.
Further, the method for preparing the ePTFE membrane comprises the following steps: under aseptic conditions, the polytetrafluoroethylene microporous membrane is placed in a nitrogen environment, and the dispersing agent is removed to obtain the EPTFE microporous membrane.
Further, in the step of removing the dispersing agent, the ambient temperature is 70-80 ℃, and the ambient pressure is 0.3-0.5 MPa.
Preferably, the EPTFE film prepared in the step of removing the dispersing agent has best physical and chemical properties when the environmental temperature is 80 ℃ and the environmental pressure is 0.5MPa
The beneficial effects are that: the invention has reasonable design and has the following beneficial effects:
in the scheme, the EPTFE film is prepared by adopting a stretching pore-forming method through steps of extrusion molding, stretching pore-forming, sintering fixation and the like, and compared with the preparation processes of a half-crosslinking agent method, a heat treatment method, a mechanical stretching method, a self-assembly method and the like, the stretching pore-forming method has the advantages of simplicity, stability, high efficiency and the like, and the EPTFE film prepared by the method has the characteristics of good oxidation resistance, wear resistance, high-temperature stability, ultrahigh air permeability and sound transmission performance and the like.
Drawings
FIG. 1 is a flow chart of the preparation process of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Example 1:
an acoustic waterproof acoustically transparent breathable film as shown in connection with fig. 1, characterized in that: the pore diameter of the ePTFE membrane is 50-100nm, the thickness is 10 mu m, the surface nodes are uniform, the ePTFE membrane is prepared by a stretching pore-forming method, and the process core comprises extrusion molding, stretching pore-forming and sintering fixation.
Wherein the pore diameter of the polytetrafluoroethylene microporous membrane is 0.02-0.05 mu m, and the thickness is 15-100 mu m, and the microporous membrane is prepared by the following steps:
s1: uniformly mixing raw material polytetrafluoroethylene dispersion resin and an auxiliary agent in a certain proportion to prepare polytetrafluoroethylene paste;
s2: putting the paste into a die, compacting the paste under a certain pressure to obtain a blank slightly smaller than the oil of a charging barrel and a solvent of an extruder and uniformly dispersing the paste;
s3: putting the blanks into an extruder, adjusting the extrusion temperature and speed to extrude all the blanks, and obtaining an extrusion rod;
s4: the extrusion rod is placed on a double-roller calender to be rolled into a film shape, and under the heating condition, the film is unidirectionally or bidirectionally stretched to prepare a polytetrafluoroethylene microporous film;
in the step S1, the auxiliary agent can be one of polyether silicone oil, fluorinated alkyl ester, polytetrafluoroethylene, carboxymethyl cellulose and the like;
in the step S1, the proportion of the polytetrafluoroethylene dispersion resin to the auxiliary agent is 5:1.1;
in the step S3, the extrusion temperature is 350 ℃;
the preparation method of the ePTFE membrane comprises the following steps: under aseptic conditions, placing the polytetrafluoroethylene microporous membrane in a nitrogen environment, and removing a dispersing agent to obtain an EPTFE microporous membrane;
the ambient temperature in the diffuser removal step was 80℃and the ambient pressure was 0.5MPa.
The EPTFE membrane prepared by the scheme has clear grid patterns of connection strokes of nodes, uniform distribution and good sound transmission quality, is waterproof, breathable and sound-transmitting at sound-transmitting holes of consumer electronic products such as mobile phones and the like, has better stability than the EPTFE membrane on the market at present, and can be widely applied to the fields of air filtration, water treatment, biological medicine and the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (7)
1. An acoustic waterproof acoustically transparent breathable film, characterized in that: the pore diameter of the ePTFE membrane is 50-100nm, the thickness is 10 mu m, the surface nodes are uniform, the ePTFE membrane is prepared by a stretching pore-forming method, and the process core comprises extrusion molding, stretching pore-forming and sintering fixation.
2. An acoustic waterproofing acoustically transparent breathable film according to claim 1 wherein: the pore diameter of the polytetrafluoroethylene microporous membrane is 0.02-0.05 mu m, and the thickness of the microporous membrane is 15-100 mu m, and the microporous membrane is prepared by the following steps:
s1: uniformly mixing raw material polytetrafluoroethylene dispersion resin and an auxiliary agent in a certain proportion to prepare polytetrafluoroethylene paste;
s2: putting the paste into a die, compacting the paste under a certain pressure to obtain a blank slightly smaller than the oil of a charging barrel and a solvent of an extruder and uniformly dispersing the paste;
s3: putting the blanks into an extruder, adjusting the extrusion temperature and speed to extrude all the blanks, and obtaining an extrusion rod;
s4: the extrusion rod is placed on a double-roller calender to be rolled into a film shape, and the film is stretched unidirectionally or bidirectionally under the heating condition to prepare the polytetrafluoroethylene microporous film.
3. An acoustic waterproofing acoustically transparent breathable film according to claim 2 wherein: in the step S1, the auxiliary agent can be one of polyether silicone oil, fluorinated alkyl ester, polytetrafluoroethylene, carboxymethyl cellulose and the like.
4. An acoustic waterproofing acoustically transparent breathable film according to claim 3 wherein: in the step S1, the proportion of the polytetrafluoroethylene dispersion resin to the auxiliary agent is 5:0.8-1.3.
5. An acoustic waterproofing acoustically transparent breathable film according to claim 4 wherein: in the step S3, the extrusion temperature is 280-380 ℃.
6. An acoustic waterproofing acoustically transparent breathable film according to claim 5 wherein: the preparation method of the ePTFE membrane comprises the following steps: under aseptic conditions, the polytetrafluoroethylene microporous membrane is placed in a nitrogen environment, and the dispersing agent is removed to obtain the EPTFE microporous membrane.
7. An acoustic waterproofing acoustically transparent breathable film according to claim 6 wherein: the ambient temperature in the step of removing the dispersing agent is 70-80 ℃, and the ambient pressure is 0.3-0.5 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311320957.XA CN117467172A (en) | 2023-10-12 | 2023-10-12 | Acoustic waterproof sound-permeable breathable film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311320957.XA CN117467172A (en) | 2023-10-12 | 2023-10-12 | Acoustic waterproof sound-permeable breathable film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117467172A true CN117467172A (en) | 2024-01-30 |
Family
ID=89628314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311320957.XA Pending CN117467172A (en) | 2023-10-12 | 2023-10-12 | Acoustic waterproof sound-permeable breathable film |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117467172A (en) |
-
2023
- 2023-10-12 CN CN202311320957.XA patent/CN117467172A/en active Pending
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