CN104015381A - Method for preparing polytetrafluoroethylene bubble point film - Google Patents
Method for preparing polytetrafluoroethylene bubble point film Download PDFInfo
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- CN104015381A CN104015381A CN201410148632.2A CN201410148632A CN104015381A CN 104015381 A CN104015381 A CN 104015381A CN 201410148632 A CN201410148632 A CN 201410148632A CN 104015381 A CN104015381 A CN 104015381A
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- ptfe
- polytetrafluoroethylene
- described step
- bubble point
- point film
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Abstract
The invention discloses a method for preparing a polytetrafluoroethylene bubble point film. The method sequentially comprises the following steps: a, burdening; b, mixing; c, prebaking; d, pressing a blank; e, pushing and pressing; f, calendaring; g, degreasing; h, expanding; and i, solidifying at high temperature, and rolling into a finished product. The preparation method disclosed by the invention is controllable in technological parameters, and the produced product is stable in performance; the prepared polytetrafluoroethylene bubble point film is 20-25 microns in thickness, and 0.4-0.5 micron in aperture, and has good air permeability.
Description
Technical field
The present invention relates to a kind of preparation method of polytetrafluoroethylene (PTFE) bubble point film.
Background technology
Polytetrafluoroethylene (PTFE) bubble point film is taking polytetrafluoroethylene (PTFE) (ptfe) as raw material, after expanded stretching, form one and there is micro porous film, this film is laminating on various fabrics and base material with special process, can become novel filter material, this novel filter material can filter the dust granules including bacterium, has and purifies logical wind action.
The polytetrafluoroethylene (PTFE) bubble point film of prior art exists tensile strength low, the shortcomings such as air penetrability deficiency.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method of polytetrafluoroethylene (PTFE) bubble point film, and preparation method's various process parameters of the present invention is controlled, and the properties of product of production are stable.And polytetrafluoroethylene (PTFE) bubble point film thickness prepared by the present invention is between 20 microns～25 microns, and aperture, between 0.4～0.5 micron, has good permeability.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of preparation method of polytetrafluoroethylene (PTFE) bubble point film, in turn includes the following steps:
A. batching: by DF-203 resin and the 65:35 mixing by weight proportion of F106 resin, form polytetrafluoroethylene (PTFE) batch mixing resin.
B. batch mixing: polytetrafluoroethylene (PTFE) batch mixing resin prepared by described step a and isoparaffin solvent by weight proportion 100:30 carry out fully, mix uniformly at 5 DEG C of temperature, obtain compound.
C. preliminary drying: the amount of getting compound 4KG prepared by described step b is placed in rustless steel container, puts into 60 DEG C of insulating boxs 12 hours;
D. press embryo: make the pre-baked compound of described step c enter mould and carry out precompressed, preload pressure is 6KG, to form the cylindrical rod of 12 centimetres of diameters;
E. pushing: cylindrical rod prepared by described steps d is inserted extruder and pushed, pushing cylinder temperature is 40 DEG C, the roundlet column type rod band that formation diameter is 30mm;
F. calendering: the sheet polytetrafluoroethylene (PTFE) base band of 0.20 millimeter of thickness, 200 millimeters of width is made in small column rod band calendering prepared by described step e;
G. degreasing: the sheet PTFE base band after described step f calendering enters degreasing baking oven and carries out degreasing, and skimming temp is 240 DEG C, and it is 0.8 m/min that front end unreels speed, and rolling speed is 8 ms/min; Solvent in sheet polytetrafluoroethylene (PTFE) base band is fully volatilized and form aperture passage, obtain the polytetrafluoroethylene (PTFE) base band after degreasing;
H. expanding: the PTFE base band after described step g degreasing enters expander, expanding speed is 30 ms/min; In expanding process, uniformity control is regulated by heat by lalonge lamp device;
I. hot setting: the end at described expander cross directional stretch is placed hot setting baking oven, the temperature of hot setting baking oven is 320 DEG C, shaping time was 30 seconds, form thickness between 20 microns～25 microns, the polytetrafluoroethylene (PTFE) bubble point film of aperture between 0.4～0.5 micron, to tail end film take-up finished product.
In described step b, described isoparaffin solvent is the ISOPAR that Exxon Mobil is produced
tMisoparaffin solvent.
In described step b, use centrifugal blender when mixing, speed of agitator is 5-10 rev/min.
In described step h, described heat by lalonge lamp device arranges 6 districts, and every district arranges respectively 50,75,100,150,200,220 Halogen lamp LEDs.
Compared with prior art, the present invention has following beneficial effect:
(1) the present invention, by DF-203 resin and the 65:35 mixing by weight proportion of F106 resin, can form the moderate resin batch mixing of molecular weight.
(2) the polytetrafluoroethylene (PTFE) bubble point film thickness that prepared by the present invention is between 20 microns～25 microns, and aperture, between 0.4～0.5 micron, has good permeability.
(3) the polytetrafluoroethylene (PTFE) bubble point permeability of film that prepared by the present invention is 35mm/s; Bubble point pressure: 100-120KPa.
(4) the polytetrafluoroethylene (PTFE) bubble point film water pressure resistance that prepared by the present invention can reach 100Kpa, and tensile strength is more than or equal to 25N/mm
2; Fault growth :≤100%.
Detailed description of the invention
In order to understand better content of the present invention, be described further below in conjunction with specific embodiment.Should be understood that these embodiment, only for the present invention is further described, limit the scope of the invention and be not used in.In addition should be understood that and reading after content of the present invention, person skilled in art makes some nonessential change or adjustment to the present invention, still belongs to protection scope of the present invention.
Embodiment 1
The preparation method of polytetrafluoroethylene (PTFE) bubble point film, comprises the step of batching, batch mixing, preliminary drying, pressure embryo, pushing, calendering, degreasing, expanding, hot setting and film take-up successively; Concrete step is as follows:
A. batching: the F106 resin that the DF-203 resin that Eastern Mountain, Shandong macromolecular material is produced and Daikin are produced by weight proportion 65:35 evenly mixes, forms the moderate polytetrafluoroethylene (PTFE) batch mixing resin of molecular weight.
B. batch mixing: polytetrafluoroethylene (PTFE) batch mixing resin prepared by described step a and the isoparaffin solvent (ISOPAR being produced by Exxon Mobil
tMisoparaffin solvent) by weight proportion 100:30 at the temperature of 5 DEG C, carry out fully, uniformly mix, agitator speed 5-10 rev/min when mixing, use centrifugal blender, can be fully by even to solvent and resin agitating; Obtain compound.
C. preliminary drying: the compound that described step b is stirred is placed in stainless container by the amount of 4KG, puts into 60 DEG C of insulating boxs 12 hours, makes polytetrafluoroethylene (PTFE) molecule, isoparaffin solvent interpenetrate and be connected;
D. press embryo: make the pre-baked compound of described step c enter mould and carry out precompressed, preload pressure is 6KG, to form the cylindrical rod of 12 centimetres of diameters, when precompressed, allow the abundant emptying of air in batch mixing, with physical connection better.
E. pushing: cylindrical rod prepared by described steps d is inserted extruder and pushed, pushing cylinder temperature is 40 DEG C, extruding forms the roundlet column type rod band that diameter is 30mm;
F. calendering: small column rod band prepared by described step e is put into mould stack, is pressed into the sheet polytetrafluoroethylene (PTFE) base band of 0.20 millimeter of thickness, 200 millimeters of width.
G. degreasing: the PTFE base band after described step f calendering enters baking oven and carries out degreasing, and skimming temp is 240 DEG C, and it is 0.8 m/min that front end unreels speed, and rolling speed is 8 ms/min; Solvent in diaphragm is fully volatilized and form aperture passage, obtain the polytetrafluoroethylene (PTFE) base band after degreasing.
H. expanding: the PTFE base band after described step g degreasing enters expander, expanding speed is 30 ms/min; In expanding process, uniformity control is regulated by heat by lalonge lamp device; The described heat by lalonge lamp device of expander of the present invention arranges 6 districts, and every district arranges respectively 50,75,100,150,200,220 Halogen lamp LEDs.(for example, to partially thick region, can heat by heat by lalonge lamp device, laterally film be pulled open.）
I. hot setting: the end at described expander cross directional stretch is placed hot setting baking oven, make under film shapes in 320 DEG C of baking ovens, (shaping time is about 30 seconds, the object of sizing is to make to prevent film retraction), form thickness between 20 microns～25 microns, the polytetrafluoroethylene (PTFE) bubble point film of aperture between 0.4～0.5 micron, to tail end film take-up finished product, prepares polytetrafluoroethylene (PTFE) bubble point film.
The Performance Detection of polytetrafluoroethylene (PTFE) bubble point film prepared by embodiment 1:
Water pressure resistance: 100KPa
Thickness: 20-25 μ m
Thickness irregularity :≤15%
Aperture: 0.4-0.5 μ m
Maximum fabric width: >=2400mm
Tensile strength:>=25N/mm
2
Fault growth :≤100%
Air penetrability: 35mm/s@500Pa
Bubble point pressure: 100-120KPa
As mentioned above, just can realize preferably the present invention.
Claims (5)
1. a preparation method for polytetrafluoroethylene (PTFE) bubble point film, in turn includes the following steps:
A. batching: by DF-203 resin and the 65:35 mixing by weight proportion of F106 resin, form polytetrafluoroethylene (PTFE) batch mixing resin.
B. batch mixing: polytetrafluoroethylene (PTFE) batch mixing resin prepared by described step a and isoparaffin solvent by weight proportion 100:30 carry out fully, mix uniformly at 5 DEG C of temperature, obtain compound.
C. preliminary drying: the amount of getting compound 4KG prepared by described step b is placed in rustless steel container, puts into 60 DEG C of insulating boxs 12 hours;
D. press embryo: make the pre-baked compound of described step c enter mould and carry out precompressed, preload pressure is 6KG, to form the cylindrical rod of 12 centimetres of diameters;
E. pushing: cylindrical rod prepared by described steps d is inserted extruder and pushed, pushing cylinder temperature is 40 DEG C, the roundlet column type rod band that formation diameter is 30mm;
F. calendering: the sheet polytetrafluoroethylene (PTFE) base band of 0.20 millimeter of thickness, 200 millimeters of width is made in small column rod band calendering prepared by described step e;
G. degreasing: the sheet PTFE base band after described step f calendering enters degreasing baking oven and carries out degreasing, and skimming temp is 240 DEG C, and it is 0.8 m/min that front end unreels speed, and rolling speed is 8 ms/min; Solvent in sheet polytetrafluoroethylene (PTFE) base band is fully volatilized and form aperture passage, obtain the polytetrafluoroethylene (PTFE) base band after degreasing;
H. expanding: the PTFE base band after described step g degreasing enters expander, expanding speed is 30 ms/min; In expanding process, uniformity control is regulated by heat by lalonge lamp device;
I. hot setting: the end at described expander cross directional stretch is placed hot setting baking oven, the temperature of hot setting baking oven is 320 DEG C, shaping time was 30 seconds, form thickness between 20 microns～25 microns, the polytetrafluoroethylene (PTFE) bubble point film of aperture between 0.4～0.5 micron, to tail end film take-up finished product.
2. the preparation method of polytetrafluoroethylene (PTFE) bubble point film as claimed in claim 1, is characterized in that, in described step b, described isoparaffin solvent is the ISOPAR that Exxon Mobil is produced
tMisoparaffin solvent.
3. the preparation method of polytetrafluoroethylene (PTFE) bubble point film as claimed in claim 2, is characterized in that, in described step b, uses centrifugal blender when mixing, and speed of agitator is 5-10 rev/min.
4. the preparation method of polytetrafluoroethylene (PTFE) bubble point film as claimed in claim 3, is characterized in that, in described step h, described heat by lalonge lamp device arranges 6 districts, and every district arranges respectively 50,75,100,150,200,220 Halogen lamp LEDs.
5. the polytetrafluoroethylene (PTFE) bubble point film that adopts claim 1-4 any one preparation method to prepare.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410148632.2A CN104015381A (en) | 2014-04-14 | 2014-04-14 | Method for preparing polytetrafluoroethylene bubble point film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410148632.2A CN104015381A (en) | 2014-04-14 | 2014-04-14 | Method for preparing polytetrafluoroethylene bubble point film |
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| CN104015381A true CN104015381A (en) | 2014-09-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110054855A (en) * | 2019-02-18 | 2019-07-26 | 浙江格尔泰斯环保特材科技股份有限公司 | A kind of polytetrafluoroethylene (PTFE) bubble point film and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392180A (en) * | 2002-07-02 | 2003-01-22 | 上海优天高新材料有限公司 | Process for producing microporous polytetrafluorethylene film |
| CN101927133A (en) * | 2010-04-23 | 2010-12-29 | 威海云龙复合纺织材料有限公司 | High-flux filter material, preparation method thereof and self-inhalation medical mask made of high-flux filter material |
| CN103612397A (en) * | 2013-11-22 | 2014-03-05 | 湖州森诺氟材料科技有限公司 | Microporous polytetrafluoroethylene membrane for electronic communication sealing industry and preparation method for microporous polytetrafluoroethylene membrane |
-
2014
- 2014-04-14 CN CN201410148632.2A patent/CN104015381A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392180A (en) * | 2002-07-02 | 2003-01-22 | 上海优天高新材料有限公司 | Process for producing microporous polytetrafluorethylene film |
| CN101927133A (en) * | 2010-04-23 | 2010-12-29 | 威海云龙复合纺织材料有限公司 | High-flux filter material, preparation method thereof and self-inhalation medical mask made of high-flux filter material |
| CN103612397A (en) * | 2013-11-22 | 2014-03-05 | 湖州森诺氟材料科技有限公司 | Microporous polytetrafluoroethylene membrane for electronic communication sealing industry and preparation method for microporous polytetrafluoroethylene membrane |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110054855A (en) * | 2019-02-18 | 2019-07-26 | 浙江格尔泰斯环保特材科技股份有限公司 | A kind of polytetrafluoroethylene (PTFE) bubble point film and preparation method thereof |
| CN110054855B (en) * | 2019-02-18 | 2021-10-15 | 浙江格尔泰斯环保特材科技股份有限公司 | Polytetrafluoroethylene bubble point membrane and preparation method thereof |
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Application publication date: 20140903 |