CN103101195B - 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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- CN103101195B CN103101195B CN201310018797.3A CN201310018797A CN103101195B CN 103101195 B CN103101195 B CN 103101195B CN 201310018797 A CN201310018797 A CN 201310018797A CN 103101195 B CN103101195 B CN 103101195B
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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 a kind of preparation method of soft sealing plate PTFE film.
Background technology
PTFE has the performances such as excellent chemically-resistant, heatproof, insulation, sticky and self-lubricating, and having great use value in fields such as medicine, industry and environmental protection, is a kind of special engineering plastics.
After gore company of U.S. invention biaxial stretching film, gore company of the U.S. has utilized 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.Current PTFE micropore biaxial stretching film is also developed at home fast, but be mainly still confined to for make weaving face fabric and with the various filtering material of other porous material produced with combination, its PTFE double stretching film thickness is generally all no more than 0.08mm, and vertical transverse strength difference is very large, service life is short, all needs to use together with other materials compound.
Summary of the invention
The present invention is to provide a kind of preparation method of soft sealing plate PTFE film, its PTFE double stretching film thickness mainly solved existing for prior art is generally all no more than 0.08mm, and vertical transverse strength difference is very large, service life is short, the technical problem all needing to use together with other materials compound etc.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals:
The preparation method of a kind of soft sealing plate PTFE film of the present invention, described method comprises:
A. batch mixing embryo: 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 polyflon powder, mixture is positioned over abundant slaking in baking oven, then compound is put in the material chamber arm of pre-molding equipment, utilize oil cylinder that compound is pressed into column blank in advance;
B. extrusion calendaring: column blank is put into extrusion equipment, by the oil cylinder of extrusion equipment, extrude axle, circular strip is extruded at the copper mouth mould of extrusion equipment, stainless steel mouth mould place, the diameter of the strip extruded is 18-25mm, be sent between upper calendering cylinder and lower calendering cylinder by circular strip, be rolled into that width is 200-300mm, thickness is the belt of 0.2-0.3mm, extruding compression ratio is 50-120, in whole process, material all needs to be incubated in the warm water of 80-90 DEG C;
C. compound calendering: be again sent to by the belt belt of 3-5 layer between upper calendering cylinder and lower calendering cylinder and carry out stacked compound calendering, obtains the belt after compound calendering;
D. longitudinal stretching: the preheating section that the belt after compound being rolled is sent to drawing oven deoils, through the belt of preheating be sent to again drawing oven longitudinal stretching section, by the cylinder of the adjustable rotating speed in longitudinal stretching section, longitudinal stretching is carried out to belt, form polytetrafluoroethylene (PTFE) belt, the cylinder of adjustable rotating speed becomes S type to arrange, and the bottom of preheating section, longitudinal stretching section is all provided with electric hot plate;
E. cross directional stretch: polytetrafluoroethylene (PTFE) belt is sent on transverse drawing mill, track cloth clip is utilized to fix polytetrafluoroethylene (PTFE) belt, by unreeling shaft, expanding axle, polytetrafluoroethylene (PTFE) belt is sent in drawing oven, belt is drawn into the polytetrafluoroethylene film that wide cut is 1.8-2.2m.
By polytetrafluoroethylene (PTFE) resin+solvent naphtha (aviation No. 3 jet fuels)+dispersant (1501 antistatic additive).By sieve screening, 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, conglomeration material not by this screen cloth can be placed in clean, airtight container, after shaking 24h under being placed on lower temperature, it is allowed to clash into wall and to disperse, for another example sieve on, shear action should be avoided in operation as far as possible, solvent naphtha is aviation No. 3 jet fuels, and dispersant is 1501 antistatic additive (alkyl water oxygen acid chromium and succinic acid isooctyl sulfoacid calcium compounds).
As preferably, the temperature of drying material in described step a is 50-60 DEG C, and the time of slaking is more than 12h.
As preferably, in described step c, the thickness after the calendering of belt compound is the 60-80% of stacked gross thickness.
As preferably, in described steps d, the temperature of preheating section is 150-200 DEG C, and the time of deoiling is not less than 1min, and the temperature of longitudinal stretching section is 250-300 DEG C, 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 sizing, and preheating section temperature is 200-300 DEG C, and stretch section temperature is 200-250 DEG C, draw ratio be 8-12 doubly, setting temperature is 310-350 DEG C, and 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 indulges horizontal aperture respectively evenly, and intensity is higher, overcome in use by the shortcoming of mechanism breakage, its membrane material prepared is specially adapted to make elasticity tetrafluoro plate, also can be used alone in industries such as air filtrations, filled up the blank of the two-way film of super thick degree PTFE.
Accompanying drawing explanation
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 prepared by the present invention.
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.
Detailed description of the invention
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: the preparation method of a kind of soft sealing plate PTFE film of this example, the steps include:
A. batch mixing embryo: just 370ml solvent naphtha mixed solution mixes with 1kg polyflon powder, mixing is that the PTFE dispersion resin after sieving is added drying, in clean wide mouth glass bottle, capacity should not exceed 2/3 of vial volume, the solvent naphtha mixed solution measured is added in resin, do not allow solvent naphtha mixed solution be stained with a bottle wall as far as possible, compress bottle cap in case its volatilization, vial is allowed to condition at less than 40 DEG C to carry out fully, Homogeneous phase mixing, mixing agitator rotating speed is lower than 2 revs/min, upset 10-20min, then the mixture mixed is positioned over more than slaking 12h in the baking oven of 50 DEG C, make solvent, dispersant, full and uniform enters in the space of 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, precompressed temperature is 65 DEG C, form the column blank of diameter 25cm, compression speed 50mm/min, pressurize 1-2min, type pressure sleeve outer diameter should than the little 0.5-1.0mm of internal diameter in pushing film chamber, internal diameter 0.2-0.3mm larger than pushing plug, wherein polytetrafluoroethylene (PTFE) is CGF-216G or great Jin F106 or the Du Pont 601A of Zhong Hao morning twilight company production,
B. extrusion calendaring: as Fig. 2, column blank 3 is put into extrusion equipment, by the oil cylinder 2 of extrusion equipment, extrude axle 4, circular strip 7 is extruded at the copper mouth mould 5 of extrusion equipment, stainless steel mouth mould 6 place, the diameter of the strip extruded is 18-25mm, circular strip is sent between upper calendering cylinder 8 and lower calendering cylinder 9, be rolled into the belt 10 that width is 200-300mm, thickness is 0.2-0.3mm, extruding compression ratio is 50-120, in whole process, material all needs to be incubated in the warm water of 80-90 DEG C;
C. compound calendering: as Fig. 3, be again sent between upper calendering cylinder 8 and lower calendering cylinder 9 by belt 10 belt of 3-5 layer and carry out stacked compound calendering, obtains the belt 11 after compound calendering, and its calendering thickness is about 80% of gross thickness, rolling;
D. longitudinal stretching: as Fig. 4, the preheating section 12 belt 11 after compound calendering being 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 DEG C, longitudinal stretching is carried out by cylinder 14 pairs of belts of the adjustable rotating speed in longitudinal stretching section, form polytetrafluoroethylene (PTFE) belt 15, the cylinder of adjustable rotating speed becomes S type to arrange, and the bottom of preheating section, longitudinal stretching section is all provided with electric hot plate 16;
E. cross directional stretch: as Fig. 5, polytetrafluoroethylene (PTFE) belt 15 is sent on transverse drawing mill, track cloth clip 17 is utilized to fix polytetrafluoroethylene (PTFE) belt, by unreeling shaft 18, expanding axle 19, polytetrafluoroethylene (PTFE) belt is sent in drawing oven, belt is drawn into the polytetrafluoroethylene film 20 that wide cut is 1.8-2.2m, after being 10s-70s its running time, carrying out cold charge district; Finally carry out trimming rolling.The polytetrafluoroethylene (PTFE) microporous membrane of high-quality (evenness errors is less than 5%), gate width (door width can be greater than 2 meters) is generated through biaxial tension.Wherein cross directional stretch is divided into preheating, stretching and sizing, and preheating section temperature is 200-300 DEG C, and stretch section temperature is 200-250 DEG C, and draw ratio is 8-12 times, and setting temperature is 310-350 DEG C, and the speed of service is 4-10m/min.
PolytetrafluoroethylFilm Film field emission scanning electron microscope photo prepared by the present invention as shown in Figure 6.The thickness of the biaxial stretching film prepared by the present invention is at 100mm-300mm, and vertical transverse strength is respectively 15MPa and 13MPa, and density is 0.7-0.9g/cm
3.Its vertical horizontal aperture is even respectively, and intensity is higher, overcomes in use by the shortcoming of mechanism breakage.Its membrane material prepared is specially adapted to make elasticity tetrafluoro plate, also can be used alone in industries such as air filtrations, the blank of the two-way film of super thick of having substituted degree PTFE.
The foregoing is only specific embodiments of the invention, but architectural feature of the present invention is not limited thereto, any those skilled in the art is in the field of the invention, and the change done or modification are all encompassed among the scope of the claims of the present invention.
Claims (4)
1. a preparation method for soft sealing plate PTFE film, is characterized in that described method comprises:
A. batch mixing embryo: by solvent naphtha and polyflon powder, dispersant is even, by screening, choice for use molecular weight is 230 ten thousand-500 ten thousand, particle diameter is the polytetrafluorethylepowder powder of 0.2-0.4 micron, during screening, conglomeration material not by this screen cloth can be placed in clean, in airtight container, after shaking 24h under being placed on lower temperature, it is allowed to clash into wall and to disperse, for another example sieve on, shear action should be avoided in operation as far as possible, wherein, the mass fraction of solvent naphtha is 20-30%, the mass fraction of dispersant is 0.1-1%, all the other are polyflon powder, mixture is positioned over abundant slaking in baking oven, then compound is put in material chamber arm (1) of pre-molding equipment, oil cylinder (2) is utilized compound to be pressed in advance column blank (3),
B. extrusion calendaring: column blank (3) is put into extrusion equipment, by the oil cylinder (2) of extrusion equipment, extrude axle (4), circular strip (7) is extruded at the copper mouth mould (5) of extrusion equipment, stainless steel mouth mould (6) place, the diameter of the strip extruded is 18-25mm, circular strip is sent between upper calendering cylinder (8) and lower calendering cylinder (9), be rolled into the belt (10) that width is 200-300mm, thickness is 0.2-0.3mm, extruding compression ratio is 50-120, in whole process, material all needs to be incubated in the warm water of 80-90 DEG C;
C. compound calendering: be again sent to by belt (10) belt of 3-5 layer between upper calendering cylinder (8) and lower calendering cylinder (9) and carry out stacked compound calendering, obtains the belt (11) after compound calendering;
D. longitudinal stretching: the preheating section (12) that the belt (11) after compound being rolled is sent to drawing oven deoils, the temperature of preheating section (12) is 150-200 DEG C, the time of deoiling is not less than 1min, through the belt of preheating be sent to again drawing oven longitudinal stretching section (13), by the cylinder (14) of the adjustable rotating speed in longitudinal stretching section, longitudinal stretching is carried out to belt, the temperature of longitudinal stretching section (13) is 250-300 DEG C, draw ratio is 8-15 times, rate of extension is 500%/sec, form polytetrafluoroethylene (PTFE) belt (15), the cylinder of adjustable rotating speed becomes S type to arrange, preheating section, the bottom of longitudinal stretching section is all provided with electric hot plate (16),
E. cross directional stretch: polytetrafluoroethylene (PTFE) belt (15) is sent on transverse drawing mill, track cloth clip (17) is utilized to fix polytetrafluoroethylene (PTFE) belt, by unreeling shaft (18), expanding axle (19), polytetrafluoroethylene (PTFE) belt is sent in drawing oven, belt is drawn into the polytetrafluoroethylene film (20) that wide cut is 1.8-2.2m, cross directional stretch is divided into preheating, stretching and sizing, preheating section temperature is 200-300 DEG C, stretch section temperature is 200-250 DEG C, draw ratio is 8-12 times, setting temperature is 310-350 DEG C, and the speed of service is 4-10m/min.
2. the preparation method of a kind of soft sealing plate PTFE film according to claim 1, the temperature that it is characterized in that drying in described step a material is 50-60 DEG C, and the time of slaking is more than 12h.
3. the preparation method of a kind of soft teflon seal plate PTFE film according to claim 1, is characterized in that in described step c, and the thickness after the calendering of belt compound is the 60-80% of stacked gross thickness.
4. the preparation method of a kind of soft sealing plate PTFE film according to claim 1, it is characterized in that the thickness of described polytetrafluoroethylene film (20) is 0.1mm-0.3mm, vertical transverse strength is respectively 15MPa and 13MPa, and density is 0.7-0.9g/cm
3.
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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 |
| CN106738780B (en) * | 2016-12-13 | 2019-02-22 | 上海康宁医疗用品有限公司 | A kind of e-PTFE plunger extrusion process |
| CN106863860B (en) * | 2017-01-12 | 2019-10-01 | 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 band |
| 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 |
| 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 |
| 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 |
| 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 |
| CN115923205B (en) * | 2023-02-20 | 2023-06-13 | 安徽省众望科希盟科技有限公司 | Multilayer film lamination method and system for sealing aerospace flap structure |
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| CN100589869C (en) * | 2006-11-30 | 2010-02-17 | 中国人民解放军总后勤部军需装备研究所 | Method of processing polytetrafluoroethene nano-aperture filter membrane |
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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. |
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