CN100566980C - The forming method of continuous long polytetrafluoroethyltwo two-way stretch sealing material - Google Patents
The forming method of continuous long polytetrafluoroethyltwo two-way stretch sealing material Download PDFInfo
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- CN100566980C CN100566980C CNB2008100348885A CN200810034888A CN100566980C CN 100566980 C CN100566980 C CN 100566980C CN B2008100348885 A CNB2008100348885 A CN B2008100348885A CN 200810034888 A CN200810034888 A CN 200810034888A CN 100566980 C CN100566980 C CN 100566980C
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Abstract
The invention belongs to technical field of plastic, be specifically related to a kind of forming method of continuous long polytetrafluoroethyltwo two-way stretch material.Concrete steps are: the biaxial tension polytetrafluoroethylene film of gained is unreeled on the device to each by the certain-length rewinding, with interlayer material by the equal length rewinding to unreeling on the device; Rewinding unreel device and the rewinding of biaxial tension polytetrafluoroethylene film the device that unreels of interlayer material and is positioned on the unwinding rack respectively; The biaxial tension polytetrafluoroethyl-ne film and the interlayer material of each layer are superimposed together, and are fixed on the cylindrical shell, rotary barrel, biaxial tension polytetrafluoroethylene film and interlayer material together hold on the cylindrical shell, and the speed of control cylindrical shell is 1～100 rev/min; Hold end, cylindrical shell is put into sintering furnace carry out sintering, be incubated 5～24h under 350 ℃～385 ℃ temperature, be cooled to 320-330 ℃, insulation 1～6h naturally cools to room temperature; Biaxial tension PTFE stuffing materials and interlayer material after firing are batched from cylindrical shell together, remove interlayer material, promptly obtain required continuous long polytetrafluoroethyl-ne biaxial tension sealing plate material.
Description
Technical field
The invention belongs to technical field of plastic, be specifically related to a kind of forming method of continuous long polytetrafluoroethyltwo two-way stretch sealing material.
Background technology
PTFE (polytetrafluoroethylene (PTFE)) has application in a lot of fields.As industrial materials, pad for example, PTFE can be used in the harsh chemical environment, and this environment can corrode conventional metals and polymeric material usually.PTFE has very wide serviceability temperature scope, can be from-273 ℃～260 ℃.
Yet the PTFE material of traditional mold pressing or extrusion molding all has relatively poor creep resistant.Creep properties especially is a shortcoming of conventional P TFE seal under load.
Polytetrafluoroethylene (PTFE) can be produced porose unidirectional swelling product according to the method for GORE United States Patent (USP) 3953566.The feature of this material is that fiber is orientated on draw direction by many nodes and fibrous.Expanded polytetrafluoroethylsealing (ePTFE) has higher intensity than expanded polytetrafluoroethylsealing not, and it has kept the chemical inertness of conventional P TFE, and when using as pad, it has wider serviceability temperature scope, reaches as high as 315 ℃.
For example the connection seal of GORE-TEX and the gasket strip of GORE-TEX, these encapsulants all are continuous length (for example more than 15 meters) moulding then and there.But this ePTFE gasket material only passes through longitudinal stretching, thereby also orientation in the vertical of its intensity, therefore, and on creep resistant also is mainly reflected in vertically.
For sealing, the best vertical and horizontal of gasket material all have creep resistant.Material with multidirectional creep resistant can make by biaxial tension PTFE, but this is subjected to the restriction of length and width.
United States Patent (USP) 5964465 has been introduced the forming method of the low creep teflon seal tape of a kind of continuous length, and it surrounds film on the cylindrical shell, behind the sintering again helical cut become a long continuously band.Though can obtain long continuously biaxial tension band with the method, but this method still is subjected to the restriction of length and width, and need make longer wideer band, just need main equipment to comprise cylindrical shell and sintering furnace, the method efficient is hanged down and once can only be produced a continuous long band in addition.
Summary of the invention
The object of the present invention is to provide a kind of forming method that is not subjected to device-restrictive, output is big, relative efficiency is high continuous long polytetrafluoroethyltwo two-way stretch sealing material.
The forming method of the continuous long polytetrafluoroethyltwo two-way stretch sealing material that the present invention proposes, described continuous long polytetrafluoroethyltwo two-way stretch sealing material is to be closed to the stretch polytetrafluoroethylraw thin layer is stacked by plurality of layers of double, form through sintered bond, concrete steps are as follows together:
1. dispersed polytetrafluoroethylresin resin is adopted the pasty state forming method and make expanded polytetrafluoroethylsealing film 2 through biaxial tension;
2. rewinding: with step 1. the polytetrafluoroethylene film 2 of gained first unreel on the device 1 to each by the certain-length rewinding, interlayer material 3 is unreeled on the device 5 by equal length rewinding to the second;
3. hold: first of polytetrafluoroethylene film in rewinding is unreeled device 1 and rewinding and first of interlayer material and unreel device 5 and be positioned over respectively on the unwinding rack, rewinding second of interlayer material 3 unreel device 5 be positioned at rewinding first of polytetrafluoroethylene film 2 unreel device 1 above or below; The polytetrafluoroethylene film 2 and the interlayer material 3 of each layer are superimposed together, and are fixed on the cylindrical shell 4, rotary barrel 4, polytetrafluoroethylene film 2 and interlayer material 3 together hold on the cylindrical shell 4, and the speed of control cylindrical shell 4 is 1～100 rev/min; Hold end, polytetrafluoroethylene film 2 and interlayer material 3 are fixed on the cylindrical shell 4;
4. sintering: with the cylindrical shell 4 that 3. step obtains, put into sintering furnace and carry out sintering, be incubated 5～24h under 350 ℃～385 ℃ temperature, then, be cooled to 320-330 ℃, insulation 1～6h closes heating afterwards, naturally cools to room temperature;
5. cutting: the cylindrical shell behind the sintering 4 is taken out from sintering furnace, expanded polytetrafluoroethylsealing sealing material after firing and interlayer material are batched from cylindrical shell 4 together, remove interlayer material 3, promptly obtain required continuous long polytetrafluoroethyltwo two-way stretch sealing material, carry out cutting according to product requirement then.
Among the present invention, step 2. described in the thickness of polytetrafluoroethylene film can be 0.01mm～1mm, be preferably 0.03mm～0.1mm.
Among the present invention, described interlayer material can be metal material or nonmetallic materials.Its length equals the length of film.Interlayer material works mainly to prevent that the PTFE film from bonding together.
Beneficial effect of the present invention: utilize the method can produce continuous long polytetrafluoroethyltwo two-way stretch sealing material, and the length of product is not subjected to the influence of equipment.The length of product only depends on the length of polytetrafluoroethylene film, once produces in addition, and output is bigger.
Description of drawings
Fig. 1 is the moulding process schematic diagram of continuously long biaxial tension sealing band.
Number in the figure: 1 is first to unreel device, and 2 is the PTFE biaxially oriented film, and 3 is interlayer material, and 4 is cylindrical shell, and 5 is second to unreel device.
The specific embodiment
Further specify the present invention below by embodiment, but the present invention is not limited only to following embodiment.
Embodiment 1
Dispersed polytetrafluoroethylresin resin and extrusion aid are fully mixed, be pressed into cylindrical blank, extrude circular bar, be rolled into certain thickness film again with the pushing machine, remove extrusion aid at a certain temperature, stretching through vertical and horizontal respectively more promptly obtains the biaxial tension polytetrafluoroethylene film.The PTFE film of long 20m, wide 1000mm, thick 0.05mm is continuously twisted on the plug, and 10 plugs like this are placed on simultaneously and unreel on the device.The stainless steel materials that uses long 20m, wide 900mm, thick 0.2mm is as interlayer material, and rolling is placed on the top that unreels device on plug.Film and stainless steel materials consistency from top to bottom are superposeed rolling to the cylindrical shell of diameter 300mm, long 900mm.In the time of on holding cylindrical shell, on the thin-film width direction, give its tension force, avoid the film constricted fold with hand.
After holding end, film and stainless steel materials are fixed.Cylindrical shell is taken off from unreeling device, put into sintering furnace, be heated to 378 ℃ of insulations 6 hours, be cooled to 330 ℃ of insulation 1h, be cooled to room temperature again.
Cylindrical shell behind the sintering is taken out.With encapsulant and stainless steel materials simultaneously respectively rolling to the plug that unreels device.Can make the polytetrafluoroethyltwo two-way stretch sealing plate material of long 20m, wide 900mm, thick 0.5mm like this.
Embodiment 2
Dispersed polytetrafluoroethylresin resin and extrusion aid are fully mixed, be pressed into cylindrical blank, extrude circular bar, be rolled into certain thickness film again with the pushing machine, remove extrusion aid at a certain temperature, stretching through vertical and horizontal respectively more promptly obtains the biaxial tension polytetrafluoroethylene film.The PTFE film of long 50m, wide 1000mm, thick 0.05mm is continuously twisted on the plug, and 20 plugs like this are placed on simultaneously and unreel on the device.The glass fabric that uses long 50m, wide 900mm, thick 0.4mm is as interlayer material, and rolling is placed on the below that unreels device on plug.Film and glass fabric consistency from top to bottom are superposeed rolling to the cylindrical shell of diameter 300mm, long 900mm.In the time of on holding cylindrical shell, on the thin-film width direction, give its tension force, avoid the film constricted fold with hand.
After holding end, glass fabric and film are fixed.Cylindrical shell is taken off from unreeling device, put into sintering furnace, be heated to 365 ℃ of insulations 112 hours, be cooled to 330 ℃ of insulation 3h, be cooled to room temperature again.
Cylindrical shell behind the sintering is taken out.With encapsulant and glass fabric simultaneously respectively rolling to the plug that unreels device.Can make the expanded polytetrafluoroethylsealing sealing plate material of long 50m, wide 900mm, thick 1mm like this.With the blade continuous long expanded polytetrafluoroethylsealing that to be cut into 30 width be 30mm sealing band.
Claims (2)
1, a kind of forming method of continuous long polytetrafluoroethyltwo two-way stretch sealing material, it is characterized in that described continuous long polytetrafluoroethyltwo two-way stretch sealing material is to be closed to the stretch polytetrafluoroethylraw thin layer is stacked by plurality of layers of double, form through sintered bond, concrete steps are as follows together:
1. dispersed polytetrafluoroethylresin resin is adopted the pasty state forming method and make expanded polytetrafluoroethylsealing film (2) through biaxial tension;
2. rewinding: with step 1. the polytetrafluoroethylene film of gained (2) first unreel on the device (1) to each by the certain-length rewinding, interlayer material (3) is unreeled on the device (5) by equal length rewinding to the second; Described interlayer material (3) is stainless steel materials or glass fabric;
3. hold: first of polytetrafluoroethylene film in rewinding is unreeled device (1) and rewinding and second of interlayer material and unreel device (5) and be positioned over respectively on the unwinding rack, rewinding second of interlayer material (3) unreel device (5) be positioned at rewinding first of polytetrafluoroethylene film (2) unreel device (1) above or below; The polytetrafluoroethylene film (2) and the interlayer material (3) of each layer are superimposed together, and be fixed on the cylindrical shell (4), rotary barrel (4), polytetrafluoroethylene film (2) and interlayer material (3) together hold on the cylindrical shell (4), and the speed of control cylindrical shell (4) is 1～100 rev/min; Hold end, polytetrafluoroethylene film (2) and interlayer material (3) are fixed on the cylindrical shell (4);
4. sintering: with the cylindrical shell (4) that 3. step obtains, put into sintering furnace and carry out sintering, be incubated 5～24h under 350 ℃～385 ℃ temperature, then, be cooled to 320-330 ℃, insulation 1～6h closes heating afterwards, naturally cools to room temperature;
5. cutting: the cylindrical shell behind the sintering (4) is taken out from sintering furnace, expanded polytetrafluoroethylsealing sealing material after firing and interlayer material are batched from cylindrical shell (4) together, remove interlayer material (3), promptly obtain required continuous long polytetrafluoroethyltwo two-way stretch sealing material, carry out cutting according to product requirement then.
2, the forming method of continuous long polytetrafluoroethyltwo two-way stretch sealing material according to claim 1, the thickness that it is characterized in that polytetrafluoroethylene film described in step 2. is 0.01mm～1mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2008100348885A CN100566980C (en) | 2008-03-20 | 2008-03-20 | The forming method of continuous long polytetrafluoroethyltwo two-way stretch sealing material |
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| CNB2008100348885A CN100566980C (en) | 2008-03-20 | 2008-03-20 | The forming method of continuous long polytetrafluoroethyltwo two-way stretch sealing material |
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| CN100566980C true CN100566980C (en) | 2009-12-09 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102210984A (en) * | 2010-04-02 | 2011-10-12 | 周志杰 | Novel separation film and preparation method thereof |
| CN102205656B (en) * | 2011-04-20 | 2013-03-20 | 上海市塑料研究所 | Preparation method of continuous long bulked polytetrafluoroethylene panel |
| CN103267124B (en) * | 2013-06-05 | 2015-07-22 | 上海市塑料研究所有限公司 | Manufacturing method of ultralow temperature resistant U-shaped seal ring |
| CN106863858B (en) * | 2015-12-11 | 2019-01-04 | 中昊晨光化工研究院有限公司 | A kind of preparation method of expanded polytetrafluoroethylsealing composite membrane |
| CN107776031A (en) * | 2016-08-29 | 2018-03-09 | 扬中市盛新氟塑制品有限公司 | A kind of polytetrafluoroethylene (PTFE) compound seal plate |
| 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 |
| CN109092084A (en) * | 2018-08-24 | 2018-12-28 | 刘宁生 | A kind of sintered combined type polytetrafluoroethylene (PTFE) microporous hydrophobic membrane of lamination |
| CN111976184A (en) * | 2019-05-24 | 2020-11-24 | 安徽省众望科希盟科技有限公司 | Production process of bidirectional expanded polytetrafluoroethylene sealing material |
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5964465A (en) * | 1996-03-13 | 1999-10-12 | W. L. Gore & Associates, Inc. | Low creep polytetrafluoroethylene form-in-place gasketing elements |
| CN1583638A (en) * | 2004-06-10 | 2005-02-23 | 上海市塑料研究所 | Integral preparing method for wide-range teflon grid material |
| WO2005095828A1 (en) * | 2004-03-10 | 2005-10-13 | Gore Enterprise Holdings, Inc. | Low stress to seal expanded ptfe gasket tape |
-
2008
- 2008-03-20 CN CNB2008100348885A patent/CN100566980C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5964465A (en) * | 1996-03-13 | 1999-10-12 | W. L. Gore & Associates, Inc. | Low creep polytetrafluoroethylene form-in-place gasketing elements |
| WO2005095828A1 (en) * | 2004-03-10 | 2005-10-13 | Gore Enterprise Holdings, Inc. | Low stress to seal expanded ptfe gasket tape |
| CN1583638A (en) * | 2004-06-10 | 2005-02-23 | 上海市塑料研究所 | Integral preparing method for wide-range teflon grid material |
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| CN101239503A (en) | 2008-08-13 |
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Owner name: SHANGHAI PLASTIC RESEARCH INSTITUTE CO., LTD. Free format text: FORMER NAME: SHANGHAI PLASTIC INST. |
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Address after: Qingpu District Xujing town Shanghai city 201702 West Zhu Lu Road No. 1251 Patentee after: Co., Ltd of Shanghai Plastic Inst. Address before: 200090 Shanghai Yangshupu Road No. 1664 Patentee before: Shanghai Plastic Inst. |