CN102555220A - Polytetrafluoroethylene fiber membrane - Google Patents
Polytetrafluoroethylene fiber membrane Download PDFInfo
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- CN102555220A CN102555220A CN201110398166XA CN201110398166A CN102555220A CN 102555220 A CN102555220 A CN 102555220A CN 201110398166X A CN201110398166X A CN 201110398166XA CN 201110398166 A CN201110398166 A CN 201110398166A CN 102555220 A CN102555220 A CN 102555220A
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Abstract
The invention relates to a preparation method of a polytetrafluoroethylene fiber membrane. The preparation method of the polytetrafluoroethylene fiber membrane is characterized in that pre-stretching is carried out on an intermediate section before stretching. The polytetrafluoroethylene fiber membrane can be stretched to be more uniform and the quality is improved. The invention belongs to the technical field of the polytetrafluoroethylene fiber membranes.
Description
Technical field
The present invention relates to a kind of preparation method of polytetrafluoroethylene fibre film and be used for this preparation method's pre-stretching device, belong to the plant equipment manufacturing technology field of polytetrafluoroethylene (PTFE).
Background technology
The most ripe in the prior art of preparation polytetrafluoroethylene fibre film with pulling method.Like application number is 200610026648.1 the described a kind of method for producing polytef amosite of Chinese invention patent, and it selects 100% polytetrafluoroethylene (PTFE) is raw material, has used process equipments such as spiral extruder, calender, stretching-machine, heat drawing machine, cutting machine, twisting mill, extrusion stretching machine, winder; Through following method manufacturing: at first drop into polytetrafluoroethylene (PTFE) at spiral extruder and push, the operating temperature of spiral extruder is that 325～420 ℃, rotating speed are 3～100r/min, behind spiral extruder, gets into the calender calendering; The operating temperature of calender is that 10～50 ℃, linear velocity are 0.5～1m/min, then gets into stretching-machine and stretches, and the stretching-machine operating temperature is that 10～50 ℃, linear velocity are 0.3～1.2m/min; Then get into heat drawing machine heat drawing; Heat drawing machine operating temperature is that 130～190 ℃, linear velocity are 0.4～1.5m/min, after get into heat drawing machine heat drawing again, heat drawing machine operating temperature is that 190～220 ℃, linear velocity are 0.5～1.1m/min; Then cut through cutting machine; The cutting machine linear velocity is 1～2m/min, and the back is by twisting mill twisting bunchy, and the twisting mill linear velocity is 1.1～2.1m/min; Then getting into the extrusion stretching machine implements rough; Extrusion stretching machine operating temperature is that 30～80 ℃, linear velocity are 4～6m/min, after get into the extrusion stretching machine again and carefully draw, extrusion stretching machine operating temperature is that 80～120 ℃, linear velocity are 6～15m/min; Get into heat drawing machine heat drawing at last; Heat drawing machine operating temperature is that 160～265 ℃, linear velocity are 5～15m/min, then by the winder rolling, promptly obtains polytetrafluoroethylene (PTFE) long fibre finished product.Related to producing of raw material band in the above-mentioned patent, and for the drawing process of this raw material band.In the prior art, it is rectangular earlier to squeeze out bar-shaped polytetrafluoroethylene (PTFE) through extruder, should rectangularly roll into raw material band through calender then.This raw material band the uneven situation that stretches often occurs when stretching, not only little himself the intensity of air-moisture-permeable amount is not high again for the film that makes.Air-moisture-permeable amount and film strength are one group of contradiction, and this is the known technology of this area.Usually the thin more air-moisture-permeable of film is effective, but its intensity difference; The thick more air-moisture-permeable weak effect of film, but its intensity is high.Good product will guarantee certain air-moisture-permeable effect, also will guarantee certain intensity.Therefore, often insufficient strength or air-moisture-permeable weak effect of the polytetrafluoroethylene fibre film of prior art for preparing.
Summary of the invention
The objective of the invention is for solving the problems of the technologies described above, a kind of polytetrafluoroethylene fibre film is provided.
Above-mentioned technical purpose of the present invention is achieved through following technical scheme:
A kind of preparation method of polytetrafluoroethylene fibre film, it may further comprise the steps:
1. mix: in ptfe micropowder, sneak into low surface tension lubricating oil, addition is 10～30% of a ptfe micropowder quality;
2. screening: above-mentioned batch mixing is sieved with 10～30 mesh sieves;
3. preformed: will place through the batch mixing of screening under 20～40 ℃ the temperature 20～28 hours;
4. extrude: use extruder that above-mentioned preformed raw material is extruded, squeezing parameter is following, and extruded velocity 5～15mm/min extrudes diameter 15～25mm, and membrana oralis draw ratio L/D is 20～40,30～50 ° of cone angles, compression ratio 140～160;
5. calendering: use calender that the raw material after extruding is rolled, roller temperature is controlled to be 140～180 ℃ during calendering; Make raw material band;
6. remove lubricant: under the temperature of the boiling point of a little higher than said low surface tension lubricating oil,, remove said low surface tension lubricating oil to said raw material band dried 18～24 hours;
7. prestretched: the raw material band of removing low surface tension lubricating oil is carried out horizontal middle prestretched;
8. drawing and setting: the raw material band to through prestretched carries out cross directional stretch first, thermal finalization first, and the secondary cross directional stretch, secondary thermal finalization makes the polytetrafluoroethylene fibre film after the secondary thermal finalization; The control parameter is following during drawing and setting, cross directional stretch speed 10～60mm/s first, and draw ratio 2～10, heat setting temperature is 200～250 ℃ first; The secondary cross directional stretch is for to stretching 50～200 times through the raw material band behind the cross directional stretch first again, and rate of extension 40～100 mm/s, secondary heat setting temperature are controlled to be 250～300 ℃.
The result that the inventor obtains after to the prior art analysis is, raw material band of the prior art middle part level of stretch when stretching is not enough, and the proximal edge stretching transition, this has caused the became uneven of film even; Because mid portion is blocked up, so the air-moisture-permeable weak effect, and the edge stretching transition, so its intensity does not reach requirement.And the inventor has improved technology, before stretching, has added the step of prestretched, makes the middle part that is difficult to be stretched in the prior art be stretched in advance, in ensuing stretching step, can effectively improve the uneven situation that stretches so.Make polytetrafluoroethylene fibre film stretching ground more even, quality is improved.
Preferred as technique scheme, in extrusion step, control squeezing parameter is following, and extruded velocity 5～15mm/min extrudes diameter 15～25mm, and membrana oralis draw ratio L/D is 20～40,30～50 ° of cone angles, compression ratio 140～160.
Preferred as technique scheme, in the drawing and setting step, the control parameter is following during drawing and setting, cross directional stretch speed 10～60mm/s first, draw ratio 2～10, heat setting temperature is 200～250 ℃ first; The secondary cross directional stretch is for to stretching 50～200 times through the raw material band behind the cross directional stretch first again, and rate of extension 40～100 mm/s, secondary heat setting temperature are controlled to be 250～300 ℃.
Preferred as technique scheme, in the prestretched step, said prestretched multiplying power is 2～5 times.
Preferred as technique scheme, described interlude is 1/3 to 2/3 part in the middle of the raw material band.
Preferred as technique scheme, in the prestretched step, it is to adopt edge that pressure roller pushes down interlude cross directional stretch then that the interlude of said raw material band carries out horizontal prestretched.
Preferred as technique scheme, in the prestretched step, it is the cross directional stretch that adopts the roller that is carved with screw thread to carry out that the interlude of said raw material band carries out horizontal prestretched.
The present invention has following beneficial effect:
The present invention has passed through the prestretched step; Can effectively improve the uniform distribution of polytetrafluoroethylraw raw material band tensile force of each several part when stretching; Also can change simultaneously the microstructure of polytetrafluoroethylraw raw material band, make intensity and the air-moisture-permeable effect at its each position all be tending towards unifying and reach a comparatively desirable degree.
Description of drawings
Fig. 1 is the prestretched sketch map of the embodiment of the invention one;
Fig. 2 is the prestretched sketch map of the embodiment of the invention two.
The specific embodiment
This specific embodiment only is to explanation of the present invention; It is not a limitation of the present invention; Those skilled in the art can make the modification that does not have creative contribution to present embodiment as required after reading this specification, but as long as in claim scope of the present invention, all receive the protection of Patent Law.
Embodiment one
A kind of polytetrafluoroethylene fibre film, it is processed through following steps:
1. mix: in ptfe micropowder, sneak into low surface tension lubricating oil, addition is 15% of a ptfe micropowder quality;
2. screening: above-mentioned batch mixing is sieved with 20 mesh sieves;
3. preformed: will place 30 ℃ following 24 hours of temperature through the batch mixing of screening;
4. extrude: use extruder that above-mentioned preformed raw material is extruded, squeezing parameter is following, and extruded velocity 10mm/min extrudes diameter 20mm, and membrana oralis draw ratio L/D is 30, cone angle 40～°, compression ratio 150;
5. calendering: use calender that the raw material after extruding is rolled, roller temperature is controlled to be 160 ℃ during calendering; Make raw material band;
6. remove lubricant: under the temperature of the boiling point of a little higher than said low surface tension lubricating oil,, remove said low surface tension lubricating oil to said raw material band dried;
7. prestretched: the raw material band of removing low surface tension lubricating oil is carried out horizontal middle prestretched;
8. drawing and setting: the raw material band to through prestretched carries out cross directional stretch first, thermal finalization first, and the secondary cross directional stretch, secondary thermal finalization makes the polytetrafluoroethylene fibre film after the secondary thermal finalization; The control parameter is following during drawing and setting, cross directional stretch speed 20mm/s first, and draw ratio is 5, heat setting temperature is 200 ℃ first; The secondary cross directional stretch is for to stretching 100 times through the raw material band behind the cross directional stretch first again, and rate of extension 80 mm/s, secondary heat setting temperature are controlled to be 250 ℃.
As shown in Figure 1, it is to adopt edge that pressure roller pushes down interlude cross directional stretch then that the interlude of said raw material band carries out horizontal prestretched.Described interlude is 1/3 to 2/3 part in the middle of the raw material band.
Embodiment two
A kind of polytetrafluoroethylene fibre film, it is processed through following steps:
1. mix: in ptfe micropowder, sneak into low surface tension lubricating oil, addition is 15% of a ptfe micropowder quality;
2. screening: above-mentioned batch mixing is sieved with 20 mesh sieves;
3. preformed: will place 30 ℃ following 24 hours of temperature through the batch mixing of screening;
4. extrude: use extruder that above-mentioned preformed raw material is extruded, squeezing parameter is following, and extruded velocity 10mm/min extrudes diameter 20mm, and membrana oralis draw ratio L/D is 30, cone angle 40～°, compression ratio 150;
5. calendering: use calender that the raw material after extruding is rolled, roller temperature is controlled to be 160 ℃ during calendering; Make raw material band;
6. remove lubricant: under the temperature of the boiling point of a little higher than said low surface tension lubricating oil,, remove said low surface tension lubricating oil to said raw material band dried;
7. prestretched: the raw material band of removing low surface tension lubricating oil is carried out horizontal middle prestretched;
8. drawing and setting: the raw material band to through prestretched carries out cross directional stretch first, thermal finalization first, and the secondary cross directional stretch, secondary thermal finalization makes the polytetrafluoroethylene fibre film after the secondary thermal finalization; The control parameter is following during drawing and setting, cross directional stretch speed 20mm/s first, and draw ratio is 5, heat setting temperature is 200 ℃ first; The secondary cross directional stretch is for to stretching 100 times through the raw material band behind the cross directional stretch first again, and rate of extension 80 mm/s, secondary heat setting temperature are controlled to be 250 ℃.
As shown in Figure 2, it is the cross directional stretch that adopts the roller be carved with screw thread to carry out that the interlude of said raw material band carries out horizontal prestretched.Described interlude is 1/3 to 2/3 part in the middle of the raw material band.
Comparative Examples
A kind of preparation method of polytetrafluoroethylene fibre film, it may further comprise the steps:
1. mix: in ptfe micropowder, sneak into low surface tension lubricating oil, addition is 15% of a ptfe micropowder quality;
2. screening: above-mentioned batch mixing is sieved with 20 mesh sieves;
3. preformed: will place 30 ℃ following 24 hours of temperature through the batch mixing of screening;
4. extrude: use extruder that above-mentioned preformed raw material is extruded, squeezing parameter is following, and extruded velocity 10mm/min extrudes diameter 20mm, and membrana oralis draw ratio L/D is 30, cone angle 40～°, compression ratio 150;
5. calendering: use calender that the raw material after extruding is rolled, roller temperature is controlled to be 160 ℃ during calendering; Make raw material band;
6. remove lubricant: under the temperature of the boiling point of a little higher than said low surface tension lubricating oil,, remove said low surface tension lubricating oil to said raw material band dried;
8. drawing and setting: the raw material band to removing low surface tension lubricating oil carries out cross directional stretch first, thermal finalization first, and the secondary cross directional stretch, secondary thermal finalization makes the polytetrafluoroethylene fibre film after the secondary thermal finalization; The control parameter is following during drawing and setting, cross directional stretch speed 20mm/s first, and draw ratio is 5, heat setting temperature is 200 ℃ first; The secondary cross directional stretch is for to stretching 100 times through the raw material band behind the cross directional stretch first again, and rate of extension 80 mm/s, secondary heat setting temperature are controlled to be 250 ℃.
Following table is depicted as the data contrast table of the product that the embodiment of the invention three and Comparative Examples make
In the last table, because embodiment is identical with the extensograph parameter of Comparative Examples, so its total level of stretch is approaching, its total air-moisture-permeable amount is more or less the same, but its intensity difference to some extent mainly shows on elongation at break and the hot strength.This has also explained the polytetrafluoroethylene fibre film of polytetrafluoroethylene fibre film strength of the present invention greater than prior art for preparing.This is because stretching of the present invention is more even.And whether even the porosity that stretches with total relation be little, also is more or less the same with total air-moisture-permeable amount.Say that from microcosmic the size differences in each aperture of polytetrafluoroethylene fibre film of the present invention's preparation is little relatively, and the difference in each aperture of polytetrafluoroethylene fibre film of prior art for preparing is bigger.
In the last table, vapor transfer rate adopts GB/T12704-1991 moisture absorption method to measure; Air permenbility adopts GB/T 5453-1997 to measure; The computational methods of elongation at break are following:
Elongation at break=△ L/L0*100%, former long L0, under the axial tension effect, the breaking length after the distortion is L, so extension at break △ L=L-L0;
The computational methods of hot strength are following:
σ t=p/(b * d), σ t is hot strength (MPa); P is peak load (N); B is specimen width (mm); D is sample thickness (mm).
Claims (7)
1. a polytetrafluoroethylene fibre film is characterized in that, it is processed through following steps:
1. mix: in ptfe micropowder, sneak into low surface tension lubricating oil;
2. screening: above-mentioned batch mixing is sieved with 10～30 mesh sieves;
3. preformed: will place through the batch mixing of screening under 20～40 ℃ the temperature 20～28 hours;
4. extrude: use extruder that above-mentioned preformed raw material is extruded;
5. calendering: use calender that the raw material after extruding is rolled, roller temperature is controlled to be 140～180 ℃ during calendering; Make raw material band;
6. remove lubricant: under the temperature of the boiling point of a little higher than said low surface tension lubricating oil,, remove said low surface tension lubricating oil to said raw material band dried;
7. prestretched: the interlude to the raw material band of removing low surface tension lubricating oil carries out horizontal prestretched;
8. drawing and setting: the raw material band to through prestretched carries out cross directional stretch first, thermal finalization first; Carry out the secondary cross directional stretch then, secondary thermal finalization makes the polytetrafluoroethylene fibre film after the secondary thermal finalization.
2. a kind of polytetrafluoroethylene fibre film according to claim 1 is characterized in that: in extrusion step, control squeezing parameter is following; Extruded velocity 5～15mm/min extrudes diameter 15～25mm, and membrana oralis draw ratio L/D is 20～40; 30～50 ° of cone angles, compression ratio 140～160.
3. a kind of polytetrafluoroethylene fibre film according to claim 1; It is characterized in that: in the drawing and setting step, the control parameter is following during drawing and setting, first cross directional stretch speed 10～60mm/s; Draw ratio 2～10, heat setting temperature is 200～250 ℃ first; The secondary cross directional stretch is for to stretching 50～200 times through the raw material band behind the cross directional stretch first again, and rate of extension 40～100 mm/s, secondary heat setting temperature are controlled to be 250～300 ℃.
4. a kind of polytetrafluoroethylene fibre film according to claim 1 is characterized in that: in the prestretched step, said prestretched multiplying power is 2～5 times.
5. a kind of polytetrafluoroethylene fibre film according to claim 1 is characterized in that: described interlude is 1/3 to 2/3 part in the middle of the raw material band.
6. a kind of polytetrafluoroethylene fibre film according to claim 1 is characterized in that: in the prestretched step, it is to adopt edge that pressure roller pushes down interlude cross directional stretch then that the interlude of said raw material band carries out horizontal prestretched.
7. a kind of polytetrafluoroethylene fibre film according to claim 1 is characterized in that: in the prestretched step, it is the cross directional stretch that adopts the roller be carved with screw thread to carry out that the interlude of said raw material band carries out horizontal prestretched.
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| CN201110398166XA CN102555220A (en) | 2011-12-05 | 2011-12-05 | Polytetrafluoroethylene fiber membrane |
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| CN201110398166XA CN102555220A (en) | 2011-12-05 | 2011-12-05 | Polytetrafluoroethylene fiber membrane |
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Cited By (5)
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| CN103101195A (en) * | 2013-01-18 | 2013-05-15 | 浙江国泰密封材料股份有限公司 | Preparation method of PTFE (Poly Tetra Fluoro Ethylene) film for flexible sealing board |
| CN103448251A (en) * | 2013-09-17 | 2013-12-18 | 浙江格尔泰斯环保特材科技有限公司 | Polytetrafluoroethylene fiber membrane for preparing ultrafine fibers |
| CN103451758A (en) * | 2013-09-17 | 2013-12-18 | 浙江格尔泰斯环保特材科技有限公司 | Polytetrafluoroethylene ultrafine fiber |
| CN104552969A (en) * | 2013-10-17 | 2015-04-29 | 杭州费尔过滤技术有限公司 | Preparation technology of PTFE (polytetrafluoroethylene) microporous membrane |
| US10066033B2 (en) | 2013-11-08 | 2018-09-04 | Saint-Gobain Performance Plastics Corporation | Articles containing PTFE having improved dimensional stability particularly over long lengths, methods for making such articles, and cable/wire assemblies containing such articles |
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| US10472432B2 (en) | 2013-11-08 | 2019-11-12 | Saint-Gobain Performance Plastics Corporation | Articles containing PTFE having improved dimensional stability particularly over long lengths, methods for making such articles, and cable/wire assemblies containing such articles |
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Application publication date: 20120711 |