CN103101195A - Preparation method of PTFE (Poly Tetra Fluoro Ethylene) film for flexible sealing board - Google Patents
Preparation method of PTFE (Poly Tetra Fluoro Ethylene) film for flexible sealing board Download PDFInfo
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- CN103101195A CN103101195A CN2013100187973A CN201310018797A CN103101195A CN 103101195 A CN103101195 A CN 103101195A CN 2013100187973 A CN2013100187973 A CN 2013100187973A CN 201310018797 A CN201310018797 A CN 201310018797A CN 103101195 A CN103101195 A CN 103101195A
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Abstract
The invention relates to a preparation method of a PTFE (Poly Tetra Fluoro Ethylene) film, and particularly relates to a preparation method of a PTFE (Poly Tetra Fluoro Ethylene) film for a flexible sealing board. A bidirectional stretching film has the characteristics of large width amplitude of 2m, high strength in the vertical direction and the transverse direction, and ultra thickness. The PTFE film can be independently used for various air filter industries, further can be used for manufacturing an elastic PTFE board by using a laminated sintering method, and has very high technical values and market benefits. The preparation method of the PTFE film for the flexible sealing board, provided by the invention, mainly comprises the following steps of: (1) mixing and manufacturing a blank; (2) extruding and calendering; (3) calendaring in a compound manner; (4) vertically stretching; and (5) transversely stretching.
Description
Technical field
The present invention relates to a kind of preparation method of PTFE film, especially relate to the preparation method that a kind of soft sealing plate is used the PTFE film.
Background technology
PTFE has the performances such as excellent chemically-resistant, heatproof, insulation, sticking and self-lubricating, has great use value in fields such as medicine, industry and environmental protection, is a kind of special engineering plastics.
After U.S. gore company invention biaxial stretching film, U.S. gore company utilizes biaxial stretching film to prepare to have high compression rebound performance and excellent creep resisting ability varicosity tetrafluoro plate and various function clothes fabric and filtering material, obtains huge industrial profit.PTFE micropore biaxial stretching film is also developed at home fast at present, but mainly still be confined to make weaving face fabric and with the various filtering materials of other porous material produced with combination, its PTFE double stretching film thickness generally all is no more than 0.08mm, and the vertical transverse strength difference is very large, service life is short, all needs to use together with other materials is compound.
Summary of the invention
The present invention is to provide the preparation method that a kind of soft sealing plate is used the PTFE film, it is mainly to solve the existing PTFE double stretching of prior art film thickness generally all to be no more than 0.08mm, and the vertical transverse strength difference is very large, service life is short, all needs and the compound technical problem of using together etc. of other materials.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
A kind of soft sealing plate of the present invention preparation method of PTFE film, described method comprises:
A. batch mixing embryo processed: solvent naphtha and polyflon powder, dispersant is even, wherein, the mass fraction of solvent naphtha is 20-30%, the mass fraction of dispersant is 0.1-1%, all the other are the polyflon powder, mixture is positioned in baking oven fully slaking, then compound is put in the material chamber arm of pre-molding equipment, utilize oil cylinder that compound is pressed into the column blank in advance;
B. extrusion calendaring: the column blank is put into extrusion equipment, oil cylinder by extrusion equipment, extrude axle, the place extrudes circular strip at the copper mouth mould of extrusion equipment, stainless steel mouth mould, the diameter of the strip of extruding is 18-25mm, circular strip is sent between upper calendering cylinder and lower calendering cylinder, and being rolled into width is that 200-300mm, thickness are the belt of 0.2-0.3mm, and extruding compression ratio is 50-120, in whole process, material all need to be incubated in the warm water of 80-90 ℃;
C. compound calendering: the belt belt of 3-5 layer is sent between upper calendering cylinder and lower calendering cylinder again carries out stacked compound calendering, obtain the belt after compound calendering;
D. longitudinal stretching: the preheating section that the belt after compound calendering is sent to drawing oven deoils, through the belt of preheating be sent to again drawing oven the longitudinal stretching section, cylinder by the adjustable rotating speed in the longitudinal stretching section carries out longitudinal stretching to belt, form the polytetrafluoroethylene (PTFE) belt, the cylinder of adjustable rotating speed becomes the S type to arrange, and the bottom of preheating section, longitudinal stretching section all is provided with electric hot plate;
E. cross directional stretch: the polytetrafluoroethylene (PTFE) belt is sent on transverse drawing mill, utilize track cloth clip to fix the polytetrafluoroethylene (PTFE) belt, by unreeling shaft, expanding axle, the polytetrafluoroethylene (PTFE) belt is sent in drawing oven, belt is drawn into the polytetrafluoroethylene film that wide cut is 1.8-2.2m.
With polytetrafluoroethylene (PTFE) resin+solvent naphtha (No. 3 jet fuels of aviation)+dispersant (1501 antistatic additive).Screen by sieve, the choice for use molecular weight 230 ten thousand-500 ten thousand, particle diameter is the polytetrafluorethylepowder powder of .0.2-0.4 micron, during screening, can not can be placed in by the conglomeration material of this screen cloth in cleaning, airtight container, be placed on shake 24h at lower temperature after, allow it clash into wall and disperse, sieve for another example, should avoid shear action in operating process as far as possible, solvent naphtha is No. 3 jet fuels of aviation, and dispersant is 1501 antistatic additive (alkyl water oxygen acid chromium and succinic acid isooctyl sulfoacid calcium compounds).
As preferably, in described step a, the temperature of baking material is 50-60 ℃, and the time of slaking is more than 12h.
As preferably, in described step c, the thickness after the compound calendering of belt is the 60-80% of stacked gross thickness.
As preferably, in described steps d, the temperature of preheating section is 150-200 ℃, and the time of deoiling is not less than 1min, and the temperature of longitudinal stretching section is 250-300 ℃, draw ratio be 8-15 doubly, rate of extension is 500%/sec.
As preferably, the cross directional stretch in described step e is divided into preheating, stretching and typing, and the preheating section temperature is 200-300 ℃, and the stretch section temperature is 200-250 ℃, draw ratio be 8-12 doubly, setting temperature is 310-350 ℃, the speed of service is 4-10m/min.
As preferably, the thickness of described polytetrafluoroethylene film is 0.1mm-0.3mm, and vertical transverse strength is respectively 15MPa and 13MPa, and density is 0.7-0.9g/cm
3
Therefore, the PTFE film that the present invention prepares in length and breadth to the aperture respectively evenly, and intensity is higher, overcome the shortcoming that in use is subjected to the mechanism breakage, the membrane material of its preparation is specially adapted to make elasticity tetrafluoro plate, also can be used in separately the industries such as air filtration, fill up the blank of the two-way film of super thickness PTFE.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of pre-molding equipment of the present invention;
Accompanying drawing 2 is a kind of structural representations of extrusion equipment equipment of the present invention;
Accompanying drawing 3 is compound calendering technology schematic diagrames of the present invention;
Accompanying drawing 4 is longitudinal stretching process schematic representations of the present invention;
Accompanying drawing 5 is cross directional stretch process schematic representations of the present invention;
Accompanying drawing 6 is PTFE film surface field emission scan electromicroscopic photographs that the present invention prepares.
Parts, position and numbering in figure: material chamber arm 1, oil cylinder 2, column blank 3, extrude belt 11, preheating section 12, longitudinal stretching section 13, cylinder 14, polytetrafluoroethylene (PTFE) belt 15, electric hot plate 16, track cloth clip 17, unreeling shaft 18, expanding axle 19, polytetrafluoroethylene film 20 after axle 4, copper mouth mould 5, stainless steel mouth mould 6, circular strip 7, upper calendering cylinder 8, lower calendering cylinder 9, belt 10, compound calendering.
The specific embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: a kind of soft sealing plate of this example the steps include: with the preparation method of PTFE film
a. batch mixing embryo processed: just 370ml solvent naphtha mixing solution and 1kg polyflon powder mix, mixing is that the PTFE dispersion resin after sieving is added drying, in clean wide-mouth vial, capacity should not surpass 2/3 of vial volume, add the solvent naphtha mixing solution that measured in resin, do not allow solvent naphtha mixing solution be stained with a bottle wall as far as possible, compress bottle cap in case its volatilization, vial is allowed to condition at carries out below 40 ℃ fully, evenly mix, the mixing agitator rotating speed is lower than 2 rev/mins, upset 10-20min, then the mixture that mixes is positioned in the baking oven of 50 ℃ more than slaking 12h, make solvent, dispersant, in the full and uniform space that enters polytetrafluorethylepowder powder, then compound is put in the material chamber arm 1 of pre-molding equipment, as Fig. 1, utilize oil cylinder 2 that compound is pressed into column blank 3 in advance, oil cylinder working-pressure is 0.4Mpa, the precompressed temperature is 65 ℃, form the column blank of diameter 25cm, compression speed 50mm/min, pressurize 1-2min, type gland cylinder external diameter should be than the little 0.5-1.0mm of internal diameter in pushing film chamber, internal diameter is than the large 0.2-0.3mm of pushing plug, wherein polytetrafluoroethylene (PTFE) is CGF-216G or Da Jin F106 or the 601A of Du Pont that middle vast and boundless morning twilight company produces,
B. extrusion calendaring: as Fig. 2, column blank 3 is put into extrusion equipment, oil cylinder 2 by extrusion equipment, extrude axle 4,6 places extrude circular strip 7 at the copper mouth mould 5 of extrusion equipment, stainless steel mouth mould, the diameter of the strip of extruding is 18-25mm, circular strip is sent between upper calendering cylinder 8 and lower calendering cylinder 9, being rolled into width is that 200-300mm, thickness are the belt 10 of 0.2-0.3mm, extruding compression ratio is 50-120, in whole process, material all need to be incubated in the warm water of 80-90 ℃;
C. compound calendering: as Fig. 3, belt 10 belts of 3-5 layer are sent between upper calendering cylinder 8 and lower calendering cylinder 9 again carry out stacked compound calendering, obtain the belt 11 after compound calendering, its calendering thickness is 80% left and right of gross thickness, rolling;
D. longitudinal stretching: as Fig. 4, the preheating section 12 that belt 11 after compound calendering is sent to drawing oven carries out degreasing and deoils, through the belt of preheating be sent to again drawing oven longitudinal stretching section 13, longitudinal stretching section temperature is 200 ~ 300 ℃, 14 pairs of belts of cylinder by the adjustable rotating speed in the longitudinal stretching section carry out longitudinal stretching, form polytetrafluoroethylene (PTFE) belt 15, the cylinder of adjustable rotating speed becomes the S type to arrange, and the bottom of preheating section, longitudinal stretching section all is provided with electric hot plate 16;
E. cross directional stretch: as Fig. 5, polytetrafluoroethylene (PTFE) belt 15 is sent on transverse drawing mill, utilize track cloth clip 17 to fix the polytetrafluoroethylene (PTFE) belt, by unreeling shaft 18, expanding axle 19, the polytetrafluoroethylene (PTFE) belt is sent in drawing oven, belt is drawn into the polytetrafluoroethylene film 20 that wide cut is 1.8-2.2m, carries out the cold charge district after being 10s-70s its running time; Carry out at last the trimming rolling.Generate the polytetrafluoroethylene (PTFE) microporous membrane of high-quality (evenness errors is less than 5%), gate width (door width can greater than 2 meters) through biaxial tension.Wherein cross directional stretch is divided into preheating, stretching and typing, and the preheating section temperature is 200-300 ℃, and the stretch section temperature is 200-250 ℃, and draw ratio is 8-12 times, and setting temperature is 310-350 ℃, and the speed of service is 4-10m/min.
The PolytetrafluoroethylFilm Film field emission scanning electron microscope photo of the present invention's preparation as shown in Figure 6.The thickness of the biaxial stretching film that the present invention is prepared is at 100mm-300mm, and vertical transverse strength is respectively 15MPa and 13MPa, and density is 0.7-0.9g/cm
3It is even respectively to the aperture in length and breadth, and intensity is higher, has overcome the shortcoming that in use is subjected to the mechanism breakage.The membrane material of its preparation is specially adapted to make elasticity tetrafluoro plate, also can be used in separately the industries such as air filtration, the blank of the two-way film of super thickness PTFE of having substituted.
The above is only specific embodiments of the invention, but architectural feature of the present invention is not limited to this, and any those skilled in the art is in the field of the invention, and the variation of doing or modification all are encompassed among the scope of the claims of the present invention.
Claims (6)
1. a soft sealing plate with the preparation method of PTFE film, is characterized in that described method comprises:
A. batch mixing embryo processed: solvent naphtha and polyflon powder, dispersant is even, wherein, the mass fraction of solvent naphtha is 20-30%, the mass fraction of dispersant is 0.1-1%, all the other are the polyflon powder, mixture is positioned over fully slaking in baking oven, then compound is put in the material chamber arm (1) of pre-molding equipment, utilize oil cylinder (2) that compound is pressed into column blank (3) in advance;
B. extrusion calendaring: column blank (3) is put into extrusion equipment, oil cylinder (2) by extrusion equipment, extrude axle (4), copper mouth mould (5), stainless steel mouth mould (6) at extrusion equipment locate to extrude circular strip (7), the diameter of the strip of extruding is 18-25mm, circular strip is sent between upper calendering cylinder (8) and lower calendering cylinder (9), being rolled into width is that 200-300mm, thickness are the belt (10) of 0.2-0.3mm, extruding compression ratio is 50-120, in whole process, material all need to be incubated in the warm water of 80-90 ℃;
C. compound calendering: belt (10) belt of 3-5 layer is sent between upper calendering cylinder (8) and lower calendering cylinder (9) again carries out stacked compound calendering, obtain the belt (11) after compound calendering;
D. longitudinal stretching: the preheating section (12) that the belt after compound calendering (11) is sent to drawing oven deoils, through the belt of preheating be sent to again drawing oven longitudinal stretching section (13), cylinder (14) by the adjustable rotating speed in the longitudinal stretching section carries out longitudinal stretching to belt, form polytetrafluoroethylene (PTFE) belt (15), the cylinder of adjustable rotating speed becomes the S type to arrange, and the bottom of preheating section, longitudinal stretching section all is provided with electric hot plate (16);
E. cross directional stretch: polytetrafluoroethylene (PTFE) belt (15) is sent on transverse drawing mill, utilize track cloth clip (17) to fix the polytetrafluoroethylene (PTFE) belt, by unreeling shaft (18), expanding axle (19), the polytetrafluoroethylene (PTFE) belt is sent in drawing oven, belt is drawn into the polytetrafluoroethylene film that wide cut is 1.8-2.2m (20).
2. a kind of soft sealing plate according to claim 1 with the preparation method of PTFE film, is characterized in that the temperature of baking material in described step a is 50-60 ℃, and the time of slaking is more than 12h.
3. a kind of soft teflon seal plate according to claim 1 with the preparation method of PTFE film, is characterized in that in described step c, and the thickness after the compound calendering of belt is the 60-80% of stacked gross thickness.
4. a kind of soft sealing plate according to claim 1 is with the preparation method of PTFE film, the temperature that it is characterized in that preheating section in described steps d (12) is 150-200 ℃, the time of deoiling is not less than 1min, the temperature of longitudinal stretching section (13) is 250-300 ℃, draw ratio is 8-15 times, and rate of extension is 500%/sec.
5. a kind of soft sealing plate according to claim 1 is with the preparation method of PTFE film, it is characterized in that the cross directional stretch in described step e is divided into preheating, stretching and typing, the preheating section temperature is 200-300 ℃, the stretch section temperature is 200-250 ℃, draw ratio is 8-12 times, setting temperature is 310-350 ℃, and the speed of service is 4-10m/min.
6. a kind of soft sealing plate according to claim 1 is with the preparation method of PTFE film, and the thickness that it is characterized in that described polytetrafluoroethylene film (20) is 0.1mm-0.3mm, and vertical transverse strength is respectively 15MPa and 13MPa, and density is 0.7-0.9g/cm
3
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103421261A (en) * | 2013-08-18 | 2013-12-04 | 浙江嘉日氟塑料有限公司 | Super-thick high-elasticity polytetrafluoroethylene sealing plate and production method thereof |
| CN106738780A (en) * | 2016-12-13 | 2017-05-31 | 上海康宁医疗用品有限公司 | A kind of e PTFE plunger expressing techniques |
| CN106863860A (en) * | 2017-01-12 | 2017-06-20 | 浙江国泰萧星密封材料股份有限公司 | A kind of preparation method of high intensity EPTFE bands |
| CN110528131A (en) * | 2019-09-20 | 2019-12-03 | 常州华福环境科技股份有限公司 | A kind of manufacturing process of high intensity low friction polytetrafluoroethylene (PTFE) sewing thread |
| CN111716754A (en) * | 2019-03-20 | 2020-09-29 | 常州福升新材料科技有限公司 | PTFE (polytetrafluoroethylene) winding film and production method thereof |
| CN112275145A (en) * | 2020-09-16 | 2021-01-29 | 浙江赛迅环保科技有限公司 | Preparation method of polytetrafluoroethylene film for mask |
| CN115230131A (en) * | 2022-09-19 | 2022-10-25 | 四川省众望科希盟科技有限公司 | Biaxial stretching device and method for improving uniformity of expanded polytetrafluoroethylene film |
| CN115923205A (en) * | 2023-02-20 | 2023-04-07 | 四川省众望科希盟科技有限公司 | Method and system for laminating multilayer films for sealing aerospace flap structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103421261A (en) * | 2013-08-18 | 2013-12-04 | 浙江嘉日氟塑料有限公司 | Super-thick high-elasticity polytetrafluoroethylene sealing plate and production method thereof |
| CN106738780A (en) * | 2016-12-13 | 2017-05-31 | 上海康宁医疗用品有限公司 | A kind of e PTFE plunger expressing techniques |
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| CN106863860A (en) * | 2017-01-12 | 2017-06-20 | 浙江国泰萧星密封材料股份有限公司 | A kind of preparation method of high intensity EPTFE bands |
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| CN111716754A (en) * | 2019-03-20 | 2020-09-29 | 常州福升新材料科技有限公司 | PTFE (polytetrafluoroethylene) winding film and production method thereof |
| CN110528131A (en) * | 2019-09-20 | 2019-12-03 | 常州华福环境科技股份有限公司 | A kind of manufacturing process of high intensity low friction polytetrafluoroethylene (PTFE) sewing thread |
| CN110528131B (en) * | 2019-09-20 | 2021-07-23 | 常州华福环境科技股份有限公司 | Manufacturing process of high-strength low-friction polytetrafluoroethylene sewing thread |
| CN112275145A (en) * | 2020-09-16 | 2021-01-29 | 浙江赛迅环保科技有限公司 | Preparation method of polytetrafluoroethylene film for mask |
| CN112275145B (en) * | 2020-09-16 | 2022-04-29 | 浙江赛迅环保科技有限公司 | Preparation method of polytetrafluoroethylene film for mask |
| CN115230131A (en) * | 2022-09-19 | 2022-10-25 | 四川省众望科希盟科技有限公司 | Biaxial stretching device and method for improving uniformity of expanded polytetrafluoroethylene film |
| CN115230131B (en) * | 2022-09-19 | 2022-11-29 | 四川省众望科希盟科技有限公司 | Biaxial stretching device and method for improving uniformity of expanded polytetrafluoroethylene film |
| CN115923205A (en) * | 2023-02-20 | 2023-04-07 | 四川省众望科希盟科技有限公司 | Method and system for laminating multilayer films for sealing aerospace flap structure |
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Effective date of registration: 20170309 Address after: 311255 Hangzhou Town, Xiaoshan District, Zhejiang, Pu Yang Town, Taoyuan Patentee after: Zhejiang Guotai Xiao Xing sealing material Limited by Share Ltd Address before: 311255 Zhejiang, Xiaoshan City, the town of Yang Yang Lake Village Patentee before: Guotai Seal Material Co., Ltd., Zhejiang Prov. |