CN103757737A - Large-diameter polytetrafluoroethylene filament and production method thereof - Google Patents
Large-diameter polytetrafluoroethylene filament and production method thereof Download PDFInfo
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- CN103757737A CN103757737A CN201310749123.0A CN201310749123A CN103757737A CN 103757737 A CN103757737 A CN 103757737A CN 201310749123 A CN201310749123 A CN 201310749123A CN 103757737 A CN103757737 A CN 103757737A
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- monofilament
- polytetrafluoroethylore
- large diameter
- polytetrafluoroethylene
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Abstract
The invention discloses a large-diameter polytetrafluoroethylene filament, comprising 70-80wt% of polytetrafluoroethylene, and 0.5-2wt% of inorganic nanometer additive, wherein the diameter of the filament is 0.5-5mm. The added inorganic nanometer particle plays toughness and reinforcement roles; the abrasive resistance of the prepared filament is improved to a certain extent; the application field of the polytetrafluoroethylene filament is greatly expanded. The invention also discloses a production method of the large-diameter polytetrafluoroethylene filament. The method comprises the procedures of mixing, feeding, pushing, drying, stretching and winding, wherein the drying procedure adopts a continuous multi-stage drying system; the system comprises three steps of drying, sintering and cooling. The continuous multi-stage drying system is adopted in process, the drying efficiency of the polytetrafluoroethylene filament is improved, and the strength of the filament is further obviously improved.
Description
Technical field
The present invention relates to a kind of large diameter polytetrafluoroethylore monofilament and production method thereof, belong to macromolecular fibre field.
Background technology
Polytetrafluoroethylene (PTFE) is one of decay resistance optimal material in the world today, therefore obtains the laudatory title of King.It can use by which kind of class chemical mediator in office for a long time, and its generation has solved many problems in the fields such as China's chemical industry, oil, pharmacy.Be widely used as encapsulant and packing material.
Because polytetrafluoroethylene (PTFE) has above-mentioned good characteristic, be mainly used in fabrics for industrial use, such as requiring high contraction intensity, goods heat-resisting and resistance to chemical attack, the sewing at hot gas filtration goods and other sew, also can be used for medical textile field.At present for the existing large quantity research of the filamentary production and processing of polytetrafluoroethylene (PTFE), spinning process mainly contains carrier spinning, pasty state extrusion spinning, film and splits spinning and melt spinning.Carrier spinning and melt spinning exist the shortcomings such as time consumption and energy consumption height, and the fiber that pasty state extrusion spinning obtains does not have definite fiber number, and it is thicker that film splits the monfil that spinning obtains, and are unfavorable for using.For membrane removal, splitting outer other of spinning needs the spinning process of sintering circuit, and sintering temperature and fiber sintering time also need further research to the impact of fibre property.
Existing filament strength is little, and preparation method is complicated, and service behaviour is undesirable.The filament diameter that at present prepared by the disclosed use melt spinning of CN102321932A is 0.10-1.0mm, and filament strength is 3.0cN/dtex.Monofilament prepared by the method is the mixture of polytetrafluoroethylene (PTFE) and other polymer, and monofilament is prepared impure, therefore can affect filament properties.Be not suitable for large batch of production.
Summary of the invention
The object of this invention is to provide a kind of large diameter polytetrafluoroethylene (PTFE) monofilament.
The polytetrafluoroethylene (PTFE) that described monofilament contains 70-80wt% and 0.5-2wt% inorganic nano-particle additive.
Described large diameter polytetrafluoroethylore filament diameter is 0.5-5mm, and the fracture strength of monofilament is 3-6.8cN/dtex, and elongation at break is 13-35%.
Described inorganic nano-particle additive is nano-calcium carbonate.
Another object of the present invention is the production method that provides a kind of large diameter polytetrafluoroethylore monofilament of the present invention for solving the problems of the technologies described above.
A kind of production method of large diameter polytetrafluoroethylore monofilament, comprise batch mixing, reinforced, pushing, dry, stretching and winding operation, what wherein in drying process, adopt is continuous multistage oven dry system, and three steps that this system comprises are dry, sintering and cooling step.
Described compounding process is for to smash the powder conglomeration material jolting of 70-80wt% polytetrafluoroethylene (PTFE), gained powder materials sieves through 10 order stainless (steel) wires, polytetrafluorethylepowder powder material is poured in the wide-mouth bottle of sealing together with 0.05-2wt% nano-calcium carbonate, add 20-30wt% lubricating auxiliary agent aviation kerosine, shake and mix 30-40min, be placed in water-bath and be incubated 16-20 hour, again cross 10 mesh sieves after insulation finishes, wherein water-bath temperature is 30-80 ℃.
Described charging process is the gravity that utilizes above-mentioned compound self, by mixing sufficient compound, in even continuous mode, pours in die cavity, feeds in raw material.
Described pushing operation becomes the nascent monofilament of polytetrafluoroethylene (PTFE) for the compound in die cavity being forced from mouth mould extrude, and the temperature of selected die cavity and mouthful mould is 30-60 ℃, and selection cone angle is 30-45 °, and speed reducing ratio is 1000-1800.
Described drying process is that the nascent monofilament of prepared polytetrafluoroethylene (PTFE) is first passed through to dryer section, and dryer section temperature is 120-140 ℃, be dried, and insulation 16-20 hour, and then passed through air section, remove aviation kerosine contained in clean monofilament completely; By sintering part, sintering portion temperature is 350-380 ℃, carries out sintering 1-2 hour again, then is carrying out coolingly at cooling water, and cooling condition is room temperature.
Described stretching and winding operation is for to carry out after-drawing by prepared polytetrafluoroethylene (PTFE) monofilament, and draw ratio is 3-5 times, after having stretched, reels again, and winding speed is 50-120m/min.
Beneficial effect: the monofilament that polytetrafluoroethylene (PTFE) of the present invention and inorganic nano-particle are mixed with, filament diameter reaches 0.5-5mm, and filament strength is 3-6.8cN/dtex, and elongation at break is 15-35%.Wherein the effect of toughness reinforcing enhancing has been played in the interpolation of inorganic nano-particle, and the ABRASION RESISTANCE of obtained monofilament also had raising to a certain degree, has greatly widened the Application Areas of polytetrafluoroethylene (PTFE) monofilament.The present invention has adopted this continuous multistage oven dry system in technique, has improved the dry efficiency of polytetrafluoroethylene (PTFE) monofilament, further makes the intensity of monofilament be significantly improved.
The specific embodiment
Implementation column below can make those skilled in the art more fully understand the present invention, but does not therefore limit the present invention among described scope of embodiments.
embodiment 1
The wide-mouth bottle of the conglomeration material of 80% powder being put into sealing vibrates to smash, then the powder materials of gained is sieved through 10 object stainless steel wire mesh screens, obtain the powder materials of small particle diameter, 80% polytetrafluorethylepowder powder material is poured in the wide-mouth bottle of sealing together with 1% nano-calcium carbonate into 20% aviation kerosine, sealing bottleneck, shake and mix 30min, then the wide-mouth bottle that compound is housed is placed in to water-bath, keep the temperature of 30 ℃, insulation 20h, insulation finish after after sieve.Utilize the gravity of compound self, by mixing sufficient compound, in even continuous mode, pour in die cavity, feed in raw material.Compound in die cavity forced from mouth mould extrude and become nascent monofilament.Selected die cavity and die temperature are 30 ℃., selecting cone angle is 40 °.Speed reducing ratio selects 1000.By prepared monofilament, first by dryer section, dryer section temperature is 120 ℃, is dried, and be incubated 16 hours, and then passed through air section, then by sintering part, sintering portion temperature is 350 ℃, carries out sintering; In cooling water, carry out coolingly, cooling condition is room temperature again.The final polytetrafluoroethylene (PTFE) monofilament with some strength and percentage elongation that obtains.Finally monofilament is carried out to after-drawing, draw ratio is 4 times, after having stretched, reels again.The fracture strength of gained monofilament is 5cN/dtex, and elongation at break is 25%, and filament diameter is 1.5mm.
embodiment 2
Material is the conglomeration material of 75% polytetrafluorethylepowder powder and the aviation kerosine of 2.0% nano-calcium carbonate and 25%, according to the method for embodiment 1, makes.The fracture strength of gained monofilament is 6.8cN/dtex, and elongation at break is 25%, and filament diameter is 4mm.
embodiment 3
Material is the conglomeration material of 75% polytetrafluorethylepowder powder and the aviation kerosine of 0.5% nano-calcium carbonate and 25%, according to the method for embodiment 1, makes.The fracture strength of gained monofilament is 5.5cN/dtex, and elongation at break is 30%, and filament diameter is 4mm.
embodiment 4
Material is the conglomeration material of 75% polytetrafluorethylepowder powder and the aviation kerosine of 1.0% nano-calcium carbonate and 25%, according to the method for embodiment 1, makes.The fracture strength of gained monofilament is 6cN/dtex, and elongation at break is 25%, and filament diameter is 2.8mm.
embodiment 5
Material is the conglomeration material of 70% polytetrafluorethylepowder powder and the aviation kerosine of 1.0% nano-calcium carbonate and 30%, according to the technique of embodiment 1, makes.The fracture strength of gained monofilament is 4cN/dtex, and elongation at break is 16%, and filament diameter is 2.8mm.
embodiment 6
Material is the conglomeration material of 75% polytetrafluorethylepowder powder and the aviation kerosine of 0% nano-calcium carbonate and 25%, according to the technique of embodiment 1, makes.The fracture strength of gained monofilament is 3.5cN/dtex, and elongation at break is 18%, and filament diameter is 2.0mm.
As shown in form above, the interpolation of inorganic nano-particle can effectively increase the diameter of monofilament, strengthens single wire fracture intensity, improves the elongation at break of monofilament.
Claims (9)
1. a large diameter polytetrafluoroethylore monofilament, is characterized in that: the polytetrafluoroethylene (PTFE) that described monofilament contains 70-80wt% and 0.5-2wt% inorganic nano-particle additive.
2. large diameter polytetrafluoroethylore monofilament according to claim 1, is characterized in that: described large diameter polytetrafluoroethylore filament diameter is 0.5-5mm, and the fracture strength of monofilament is 3-6.8cN/dtex, and elongation at break is 13-35%.
3. large diameter polytetrafluoroethylore monofilament according to claim 1, is characterized in that: described inorganic nano-particle additive is nano-calcium carbonate.
4. the production method of a large diameter polytetrafluoroethylore monofilament claimed in claim 1, comprise batch mixing, reinforced, pushing, dry, stretching and winding operation, it is characterized in that: what in drying process, adopt is continuous multistage oven dry system, that described system comprises is dry, sintering and cooling three phases.
5. the production method of large diameter polytetrafluoroethylore monofilament according to claim 4, it is characterized in that: described compounding process is for to smash the powder conglomeration material jolting of 70-80wt% polytetrafluoroethylene (PTFE), gained powder materials sieves through 10 order stainless (steel) wires, polytetrafluorethylepowder powder material after sieving is poured in the container of sealing together with 0.5-2wt% nano-calcium carbonate, add 20-30wt% lubricating auxiliary agent, shake and mix 30-40min, be placed in water-bath and be incubated 16-20 hour, after insulation finishes, again cross 10 mesh sieves, wherein water-bath temperature is 30-80 ℃.
6. the production method of large diameter polytetrafluoroethylore monofilament according to claim 4, is characterized in that: described charging process is the gravity that utilizes above-mentioned compound self, by mixing sufficient compound, in even continuous mode, pours in die cavity, feeds in raw material.
7. the production method of large diameter polytetrafluoroethylore monofilament according to claim 4, it is characterized in that: described pushing operation becomes the nascent monofilament of polytetrafluoroethylene (PTFE) for the compound in die cavity is extruded from mouth mould, the temperature of selected die cavity and mouthful mould is 30-60 ℃, selection cone angle is 30-45 °, and speed reducing ratio is 1000-1800.
8. the production method of large diameter polytetrafluoroethylore monofilament according to claim 4, it is characterized in that: described drying process is for first passing through dryer section by the nascent monofilament of prepared polytetrafluoroethylene (PTFE), dryer section temperature is 120-140 ℃, is dried insulation 16-20 hour, and then passed through air section, by sintering part, sintering portion temperature is 350-380 ℃, sintering 1-2 hour again, at cooling water, carry out coolingly, cooling condition is room temperature again.
9. the production method of large diameter polytetrafluoroethylore monofilament according to claim 4, it is characterized in that: described stretching and winding operation is for to carry out after-drawing by prepared polytetrafluoroethylene (PTFE) monofilament, draw ratio is 3-5 times, after having stretched, reels again, and winding speed is 50-120m/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310749123.0A CN103757737A (en) | 2013-12-31 | 2013-12-31 | Large-diameter polytetrafluoroethylene filament and production method thereof |
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| CN201310749123.0A CN103757737A (en) | 2013-12-31 | 2013-12-31 | Large-diameter polytetrafluoroethylene filament and production method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975371A (en) * | 2015-06-05 | 2015-10-14 | 范红梅 | Teflon filament and production method thereof |
| CN106192051A (en) * | 2016-09-23 | 2016-12-07 | 江苏金由新材料有限公司 | A kind of politef long fibre and preparation method thereof, split film device |
| CN106757472A (en) * | 2016-12-01 | 2017-05-31 | 南通博泰美术图案设计有限公司 | Polytetrafluoroethylene (PTFE) monofilament and its production method |
| CN106906532A (en) * | 2017-04-26 | 2017-06-30 | 南通博泰美术图案设计有限公司 | Polytetrafluoroethylene (PTFE) monofilament and its production method |
| CN110747529A (en) * | 2019-11-11 | 2020-02-04 | 南通新帝克单丝科技股份有限公司 | Large-diameter PFA monofilament and production method thereof |
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| CN101985783A (en) * | 2010-10-20 | 2011-03-16 | 山东嘉年华氟纶有限公司 | Polytetrafluoroethylene fiber with antistatic function of and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975371A (en) * | 2015-06-05 | 2015-10-14 | 范红梅 | Teflon filament and production method thereof |
| CN106192051A (en) * | 2016-09-23 | 2016-12-07 | 江苏金由新材料有限公司 | A kind of politef long fibre and preparation method thereof, split film device |
| CN106757472A (en) * | 2016-12-01 | 2017-05-31 | 南通博泰美术图案设计有限公司 | Polytetrafluoroethylene (PTFE) monofilament and its production method |
| CN106906532A (en) * | 2017-04-26 | 2017-06-30 | 南通博泰美术图案设计有限公司 | Polytetrafluoroethylene (PTFE) monofilament and its production method |
| CN110747529A (en) * | 2019-11-11 | 2020-02-04 | 南通新帝克单丝科技股份有限公司 | Large-diameter PFA monofilament and production method thereof |
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Application publication date: 20140430 |