CN111907085A - Novel melt-blown fabric coated PTFE composite material and preparation process thereof - Google Patents
Novel melt-blown fabric coated PTFE composite material and preparation process thereof Download PDFInfo
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- CN111907085A CN111907085A CN202010738547.7A CN202010738547A CN111907085A CN 111907085 A CN111907085 A CN 111907085A CN 202010738547 A CN202010738547 A CN 202010738547A CN 111907085 A CN111907085 A CN 111907085A
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- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 85
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 85
- 239000002131 composite material Substances 0.000 title claims abstract description 38
- 239000004744 fabric Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 28
- 238000005245 sintering Methods 0.000 claims abstract description 24
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 238000007514 turning Methods 0.000 claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 13
- 239000000725 suspension Substances 0.000 claims abstract description 13
- 238000005098 hot rolling Methods 0.000 claims abstract description 12
- 238000013329 compounding Methods 0.000 claims abstract description 11
- 230000035699 permeability Effects 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000000748 compression moulding Methods 0.000 claims abstract description 10
- 229920000728 polyester Polymers 0.000 claims abstract description 10
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 5
- 239000004917 carbon fiber Substances 0.000 claims abstract description 5
- 239000003365 glass fiber Substances 0.000 claims abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 239000012528 membrane Substances 0.000 claims description 13
- 238000007873 sieving Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000003490 calendering Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007723 die pressing method Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 2
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000012982 microporous membrane Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
-
- 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
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/14—Filters
-
- 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
-
- 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
- C08J2491/00—Characterised by the use of oils, fats or waxes; Derivatives thereof
Abstract
The invention belongs to the technical field of PTFE materials, in particular to a novel melt-blown cloth coated PTFE composite material and a preparation process thereof, wherein PTFE suspension resin is sieved into powder by a screen mesh, is uniformly mixed with auxiliary oil according to a certain proportion, and is subjected to compression molding, sintering, turning, melting and stretching to obtain a PTFE film; coating PTFE films on the two sides of the filtering material with high air permeability through a hot compress machine, and performing hot rolling compounding with melt-blown cloth to form a new composite material; the proportion of the PTFE powder to the auxiliary oil is 1: (0.25-0.27), the particle size of the PTFE suspension resin is 20-100 μm, the filter material is one or more of PET polyester, PBT polyester, carbon fiber and glass fiber, and the auxiliary oil is Mobil oil; the novel composite material prepared by the invention can effectively increase the filtering efficiency of the material, simultaneously increase the resistance of the material in a small range, and can meet the filtering requirements of different grades.
Description
Technical Field
The invention belongs to the technical field of PTFE (polytetrafluoroethylene) materials, and particularly relates to a novel melt-blown cloth coated PTFE composite material and a preparation process thereof.
Background
Polytetrafluoroethylene (Teflon or PTFE), commonly known as "plastic king", is a high molecular compound formed by polymerizing tetrafluoroethylene, and has excellent chemical stability, corrosion resistance, sealing property, high lubrication non-adhesiveness, electrical insulation property and good aging resistance.
With the enhancement of current health consciousness, people work daily, the air quality requirement of the living environment is also continuously improved, compared with source control and ventilation dilution, air filtration is one of effective methods for solving the problem of air quality, and the common PTFE microporous membrane is used as a microporous and high-flux organic membrane and is commonly used in the field of air dust removal.
Meltblown materials are commonly used in the production of masks in the face of an outbreak of an epidemic.
Therefore, it is important to combine PTFE with the melt-blown material to form a composite filter membrane material with high efficiency.
Disclosure of Invention
In view of the above, the present invention provides a new melt-blown cloth-coated PTFE composite material and a preparation process thereof.
In order to solve the problems, the invention provides a novel melt-blown cloth coated PTFE composite material, which is prepared by sieving PTFE suspension resin into powder through a screen, uniformly mixing the powder with auxiliary oil according to a certain proportion, and performing compression molding, sintering, turning, melting and stretching to obtain a PTFE film;
and (3) coating the PTFE film on the two sides of the filtering material with high air permeability through a hot compress machine, and performing hot rolling compounding with melt-blown cloth to form a new composite material.
Preferably, the ratio of the PTFE powder to the auxiliary oil is 1: (0.25-0.27).
Preferably, the particle size of the PTFE suspension resin is 20 to 100 μm.
Preferably, the filter material is one or more of PET polyester, PBT polyester, carbon fiber and glass fiber.
Preferably, the auxiliary oil is Mobil oil.
The invention provides a preparation process of a novel melt-blown cloth coated PTFE composite material, which comprises the following steps:
step S1, sieving the raw materials: sieving PTFE suspension resin through a 10-mesh screen, adding auxiliary oil, and uniformly mixing according to a certain proportion to obtain a mixture for later use;
step S2, compression molding: molding the mixture obtained in the step S1 by a hydraulic press at 35-40MPa to obtain a molded product, and taking out the molded product for later use;
step S3, sintering: putting the die pressing product obtained in the step S2 into a sintering furnace for heating and sintering, cooling to room temperature after sintering is finished to obtain a sintered product, and taking out for later use;
step S4, turning, namely turning the sintered product obtained in the step S3 on a lathe to obtain a turned film;
step S5, melt stretching: rolling and drying the turned membrane obtained in the step S4, and then stretching to obtain a PTFE membrane;
step S6, the PTFE film obtained in the step S5 is covered on the two sides of the filtering material with high air permeability, and a double-layer PTFE film is obtained;
and step S7, performing hot rolling compounding on the double-layer PTFE film obtained in the step S6 and the melt-blown cloth to form a new composite material.
Preferably, the raising and lowering temperature in the step S3 is 20-30 ℃/h, and the sintering temperature is 355-385 ℃.
Preferably, the turning nose angle in the step S4 is 40 ° to 45 °.
Preferably, the calendering ratio is 215-310, and the stretching ratio is 5-20.
Preferably, the PTFE membrane has a mesh-through structure with a pore size of 0.4 to 2.0 μm.
The technical scheme of the invention has the following beneficial technical effects:
the new composite material prepared by the invention can effectively increase the filtering efficiency of the material and simultaneously increase the resistance of the material in a small range.
Drawings
FIG. 1 is a flow chart of a preparation process of a novel melt-blown cloth coated PTFE composite material;
FIG. 2 is a schematic diagram of hot rolling compounding according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
A new melt-blown cloth coated PTFE composite material is prepared by sieving PTFE suspension resin into powder through a screen, uniformly mixing the powder with auxiliary oil according to a certain proportion, and performing compression molding, sintering, turning, melting and stretching to obtain a PTFE film;
and (3) coating the PTFE film on the two sides of the filtering material with high air permeability through a hot compress machine, and performing hot rolling compounding with melt-blown cloth to form a new composite material.
Refer to fig. 1.
Example 1
A preparation process of a novel melt-blown cloth coated PTFE composite material comprises the following steps:
step S1, sieving the raw materials: sieving PTFE suspension resin through a 10-mesh screen, adding auxiliary oil, and uniformly mixing according to a certain proportion to obtain a mixture for later use;
step S2, compression molding: carrying out compression molding on the mixture obtained in the step S1 through a hydraulic press at 35MPa to obtain a molded product, and taking out the molded product for later use;
step S3, sintering: putting the die pressing product obtained in the step S2 into a sintering furnace for heating and sintering, cooling to room temperature after sintering is finished to obtain a sintered product, and taking out for later use;
step S4, turning, namely turning the sintered product obtained in the step S3 on a lathe to obtain a turned film;
step S5, melt stretching: rolling and drying the turned membrane obtained in the step S4, and then stretching to obtain a PTFE membrane;
step S6, the PTFE film obtained in the step S5 is covered on the two sides of the filtering material with high air permeability, and a double-layer PTFE film is obtained;
and step S7, performing hot rolling compounding on the double-layer PTFE film obtained in the step S6 and the melt-blown cloth to form a new composite material.
Preferably, the temperature rise and fall in the step S3 is 20 ℃/h, and the sintering temperature is 370 ℃.
Preferably, the turning point angle in the step S4 is 45 °.
Preferably, the calendering magnification is 220, and the stretching magnification is 10.
Preferably, the PTFE membrane has a mesh-through structure with a pore size of 0.4 to 2.0 μm.
Wherein the proportion of the PTFE powder to the auxiliary oil is 1: 0.25.
the particle size of the PTFE suspension resin is 50 μm.
The filter material is one or more of PET polyester, PBT polyester, carbon fiber and glass fiber.
The auxiliary oil is Mobil oil.
In the embodiment, the PTFE films are coated on the two sides of the filtering material with high air permeability through hot compress, the hot compress condition is selected, the roller gap is 0.25mm, the unwinding is free of tension, the winding tension is 0.4, the vehicle speed is 7m/s initially, and then the speed is uniformly increased to 10 m/s.
Example 2
A preparation process of a novel melt-blown cloth coated PTFE composite material comprises the following steps:
step S1, sieving the raw materials: sieving PTFE suspension resin through a 10-mesh screen, adding auxiliary oil, and uniformly mixing according to a certain proportion to obtain a mixture for later use;
step S2, compression molding: carrying out compression molding on the mixture obtained in the step S1 through a hydraulic press under 40MPa to obtain a molded product, and taking out the molded product for later use;
step S3, sintering: putting the die pressing product obtained in the step S2 into a sintering furnace for heating and sintering, cooling to room temperature after sintering is finished to obtain a sintered product, and taking out for later use;
step S4, turning, namely turning the sintered product obtained in the step S3 on a lathe to obtain a turned film;
step S5, melt stretching: rolling and drying the turned membrane obtained in the step S4, and then stretching to obtain a PTFE membrane;
step S6, the PTFE film obtained in the step S5 is covered on the two sides of the filtering material with high air permeability, and a double-layer PTFE film is obtained;
and step S7, performing hot rolling compounding on the double-layer PTFE film obtained in the step S6 and the melt-blown cloth to form a new composite material.
Preferably, the raising and lowering temperature in the step S3 is 25 ℃/h, and the sintering temperature is 380 ℃.
Preferably, the turning nose angle in the step S4 is 42.
Preferably, the calendering magnification is 250 and the stretching magnification is 15.
Preferably, the PTFE membrane has a mesh-through structure with a pore size of 0.4 to 2.0 μm.
In the embodiment, the PTFE films are coated on the two sides of the filtering material with high air permeability through hot compress, the hot compress condition is selected, the roller gap is 0.25mm, the unwinding is free of tension, the winding tension is 0.8, the vehicle speed is 7m/s initially, and then the speed is uniformly increased to 10 m/s.
Compared with the new composite material obtained in the embodiment 1, the new composite material obtained in the embodiment has obviously increased filtering effect.
Wherein the proportion of the PTFE powder to the auxiliary oil is 1: 0.25.
the particle size of the PTFE suspension resin is 50 μm.
The filter material is one or more of PET polyester, PBT polyester, carbon fiber and glass fiber.
The auxiliary oil is Mobil oil.
The new material of the process is characterized in that the PTFE films are covered on the two sides of the filtering material with high air permeability, so that the PTFE material has double layers of PTFE films, and the filtering material is arranged between the double layers of PTFE films to be used as a supporting layer.
As shown in fig. 2, the hot rolling and compounding process includes a double-layer PTFE microporous film 1, a meltblown fabric 2, an upper heated roll 3, and a lower engraved roll 4. The double-layer PTFE microporous film 1 is uniformly laid on a melt-blown fabric 2 conveyed by a net conveying curtain to form a two-layer superposed composite body, and then the two-layer superposed composite body is fed into a non-woven hot rolling system to form a new composite material 5 through the pressure and heat action of an upper heating roller 3 and a lower engraved roller 4.
More specifically, in the hot rolling compounding process, the upper heating roller 3 contacts with the upper surface of the double-layer PTFE microporous film 1, heat is transferred from the surface of the upper heating roller 3 to the melt-blown cloth 2 through PTFE micropores, and under proper temperature, pressure and speed control, PP fibers on the melt-blown cloth 2 are slightly melted and adhered to the double-layer PTFE microporous film 1 to form a whole, so as to form the new composite material 5.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A new melt-blown cloth coated PTFE composite material is characterized in that PTFE suspension resin is screened into powder by a screen mesh, and is uniformly mixed with auxiliary oil according to a certain proportion, and a PTFE film is obtained after compression molding, sintering, turning, melting and stretching;
and (3) coating the PTFE film on the two sides of the filtering material with high air permeability through a hot compress machine, and performing hot rolling compounding with melt-blown cloth to form a new composite material.
2. The new melt-blown cloth-coated PTFE composite material according to claim 1, wherein the ratio of the PTFE powder to the additive oil is 1: (0.25-0.27).
3. The new meltblown fabric PTFE composite material of claim 1, wherein the particle size of the PTFE suspension resin is 20-100 μm.
4. The new meltblown fabric PTFE composite material of claim 1, wherein the filter material is one or more of PET polyester, PBT polyester, carbon fiber and glass fiber.
5. The new melt-blown cloth membrane-covered PTFE composite material as claimed in claim 1, wherein the auxiliary oil is Mobil oil.
6. The preparation process of the novel melt-blown cloth-coated PTFE composite material according to any one of claims 1 to 5, characterized by comprising the following steps:
step S1, sieving the raw materials: sieving PTFE suspension resin through a 10-mesh screen, adding auxiliary oil, and uniformly mixing according to a certain proportion to obtain a mixture for later use;
step S2, compression molding: molding the mixture obtained in the step S1 by a hydraulic press at 35-40MPa to obtain a molded product, and taking out the molded product for later use;
step S3, sintering: putting the die pressing product obtained in the step S2 into a sintering furnace for heating and sintering, cooling to room temperature after sintering is finished to obtain a sintered product, and taking out for later use;
step S4, turning, namely turning the sintered product obtained in the step S3 on a lathe to obtain a turned film;
step S5, melt stretching: rolling and drying the turned membrane obtained in the step S4, and then stretching to obtain a PTFE membrane;
step S6, the PTFE film obtained in the step S5 is covered on the two sides of the filtering material with high air permeability, and a double-layer PTFE film is obtained;
and step S7, performing hot rolling compounding on the double-layer PTFE film obtained in the step S6 and the melt-blown cloth to form a new composite material.
7. The process for preparing novel meltblown cloth-coated PTFE composite material as claimed in claim 6, wherein the temperature rise and fall in step S3 is 20-30 ℃/h, and the sintering temperature is 355-385 ℃.
8. The process for preparing the new melt-blown cloth-coated PTFE composite material according to claim 6, wherein the turning tool nose angle in the step S4 is 40-45 °.
9. The process for preparing novel melt-blown cloth-coated PTFE composite material as claimed in claim 6, wherein the calendering ratio is 215-310, and the stretching ratio is 5-20.
10. The process for preparing the novel melt-blown cloth-coated PTFE composite material according to claim 6, wherein the PTFE film has a mesh penetrating structure and the pore diameter is 0.4-2.0 μm.
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| CN202010738547.7A CN111907085A (en) | 2020-07-28 | 2020-07-28 | Novel melt-blown fabric coated PTFE composite material and preparation process thereof |
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| CN202010738547.7A CN111907085A (en) | 2020-07-28 | 2020-07-28 | Novel melt-blown fabric coated PTFE composite material and preparation process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113372597A (en) * | 2021-06-02 | 2021-09-10 | 潘秋 | PA film and production process thereof |
| CN116512648A (en) * | 2023-07-04 | 2023-08-01 | 江苏源氢新能源科技股份有限公司 | Preparation method of polytetrafluoroethylene high-strength microporous membrane |
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| CN203873053U (en) * | 2014-06-10 | 2014-10-15 | 武汉龙飞翔科技产品制造有限公司 | Mask with e-PTFE microporous membranes |
| CN109228569A (en) * | 2018-08-08 | 2019-01-18 | 蚌埠市明威滤清器有限公司 | A method of filter composite highly effective filter material is prepared with microporous teflon membran-melt-blown non-woven material |
| CN109203525A (en) * | 2018-08-29 | 2019-01-15 | 山东东岳高分子材料有限公司 | A kind of manufacturing process of high-strength polytetrafluoroethyl-ne film |
| CN109621750A (en) * | 2019-01-07 | 2019-04-16 | 浙江净膜环保有限责任公司 | The two-sided covering material of polytetrafluoroethylene (PTFE) |
| CN111070825A (en) * | 2020-02-18 | 2020-04-28 | 湖州禾海材料科技有限公司 | Reusable polytetrafluoroethylene microporous film composite mask material, preparation method and mask prepared from same |
| CN111330356A (en) * | 2020-03-09 | 2020-06-26 | 浙江东蒙医疗器械有限公司 | Filter element, preparation method thereof and mask |
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| CN113372597A (en) * | 2021-06-02 | 2021-09-10 | 潘秋 | PA film and production process thereof |
| CN116512648A (en) * | 2023-07-04 | 2023-08-01 | 江苏源氢新能源科技股份有限公司 | Preparation method of polytetrafluoroethylene high-strength microporous membrane |
| CN116512648B (en) * | 2023-07-04 | 2023-12-01 | 江苏源氢新能源科技股份有限公司 | Preparation method of polytetrafluoroethylene high-strength microporous membrane |
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Application publication date: 20201110 |