CN110129933A - A kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof - Google Patents
A kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof Download PDFInfo
- Publication number
- CN110129933A CN110129933A CN201910368081.3A CN201910368081A CN110129933A CN 110129933 A CN110129933 A CN 110129933A CN 201910368081 A CN201910368081 A CN 201910368081A CN 110129933 A CN110129933 A CN 110129933A
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- Prior art keywords
- monofilament
- multifilament
- polytetrafluoroethylene
- ptfe
- silk
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Classifications
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
-
- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D10B2321/04—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons
- D10B2321/042—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polymers of halogenated hydrocarbons polymers of fluorinated hydrocarbons, e.g. polytetrafluoroethene [PTFE]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Artificial Filaments (AREA)
Abstract
The invention discloses a kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof, belong to polytetrafluoroethylene fibre field, for weaving liquid filter screen, filter cloth and the industrial rope of establishment, have fabric tissue density more better than monofilament, flexibility, tension strength.The preparation method of this kind of polytetrafluoroethylene (PTFE) multifilament, comprising the following steps: S1: single twisting；S2: monofilament drafting forming；S3: monofilament oils；S4: and silk；S5: heating drawing-off；S6: pine is viscous；S7: silk is received.In the present invention in technique, single twisting enhances strength of filament and wearability, toughness；Drafting forming reduces monofilament linear density, and line is twisted in solidification, increases superficial roughness；Monofilament oils the hot melt adhesion reduced between monofilament；And monofilament boundling is sintered drawing-off for filament tow and is heated drawing-off again, while reducing tow entirety line density, be allowed to neat and well spaced, docile by silk；Pine is viscous to be folded to stretching by device, and the monofilament of interrupted adhesion be partially disengaged, makes multifilament more soft, is easy to weave.
Description
Technical field
The present invention relates to polytetrafluoroethylene fibre field more particularly to a kind of polytetrafluoroethylene (PTFE) multifilament, more particularly to one
Kind polytetrafluoroethylene (PTFE) multifilament and preparation method thereof.
Background technique
Polytetrafluoroethylene fibre material has been widely applied to because of its excellent heat resistance and corrosion resistance
Various industrial filter fields.In chemical industry, the purification filtering of various acid, the alkaline chemical products such as concentrated acid, soda ash needs
Use solarization net, filter cylinder, filter bag, rope made of resistant material.Current selectable material is poly- in addition to stainless steel material
The products such as tetrafluoroethene web material (cloth).Because polytetrafluoroethylproducts products are equal in terms of rotproofness, weavability, filtering fineness
Have than the former superior performance, the materials'use service life is long, and cost is increasingly becoming first choice also below the former.
Therefore, the extensive application of Teflon filtration net (cloth), rope, supports the hair of polytetrafluoroethylene fibre material
Exhibition, especially filament materials.But current polytetrafluoroethylene fibre material, especially filament fiber, also because of material characteristics system
The restriction for making technology, being primarily due to polytetrafluoroethylene (PTFE) has the characteristics that lack liquid fluidity under molten condition, leads to fiber
Material is not available the melt-blown mode that general chemical fibre produces and uses, and can produce to obtain the mode of polytetrafluoroethylfilament filament at present,
There are mainly three types of: one is " emulsion carriers spinning method ", this is that a kind of long filament similar to melt-spraying spinning produces mode, specific side
Formula is to carry out spinneret production after solution is made using the materials such as ptfe emulsion and prezenta, crosslinking agent, after collecting silk
Again by sintering carbonization, the processes such as pickling remove foreign matter after it is obtained it is a kind of because carbon remaining due to make color be in sepia poly- four
Vinyl fluoride fiber, the technique can according to need design polytetrafluoroethylene (PTFE) multifilament, has good practical performance.But due to
Technique is related to high temperature cabonization and acid cleaning process, and environmental pollution is affected, and is limited by stringent environmental protection policy.Other two kinds
Long filament manufacturing technology has similar technology in front end, is exactly all by mixing polyflon and industrial extrusion aid
After synthetic thickener, a direction be by send bar roll prolong film forming band cut into silk again, thereafter through processes such as oversintering, drawing-offs
The manufacturing process of monofilament is made, is referred to as " film chopping " technique in the industry, finished product monofilament is also referred to as " flat filament " in flat；
Another direction is that after thickener is squeezed out raw silk by pushing extrusion cavity, monofilament is made through processes such as oversintering, drawing-offs
Manufacturing process is referred to as in the industry " squeezing out silk " technique, and finished product monofilament is rounded, is also referred to as " circle silk ".Both technique kinds,
The Zhongdao product of production procedure with the presentation of monofilament shape, can not form multifilament.
Meanwhile also due to manufacturing process limitation, the polytetrafluoroethylene (PTFE) monofilament manufacturing cost of lower line density is high, for example
The monofilament of the lower line density of 300D or less, online density uniformity, continuous length, fluffing control etc. are all by manufacture work
Skill or material property restrict.In addition the shape defect of flat filament or circle silk itself, for high-precision filter screen (cloth) and more volumes
Thicker polytetrafluoroethylene (PTFE) rope, is all limited by monofilament material.The present invention is directed to the manufactures by multifilament, improve above-mentioned ask
Topic.
In conclusion inventor thinks: being limited in " dairy industry support methods " production polytetrafluoroethylene (PTFE) multifilament by environmental protection, in addition
In the case that two kinds of techniques can only produce polytetrafluoroethylene (PTFE) monofilament, using latter two technique, the technique reproduced by monofilament boundling
Method produces a kind of polytetrafluoroethylene (PTFE) multifilament, is exactly innovative point of the invention.
Summary of the invention
The object of the present invention is to provide a kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof, this multifilament is using including two
Root but be not limited to two polytetrafluoroethylene (PTFE) monofilament and silk boundling after, be fabricated by heating drawing-off again.Specifically
It is: after the polytetrafluoroethylene (PTFE) monofilament of certain specification is twisted, then will will include two, but be not limited to two polytetrafluoroethylene (PTFE)
Twisted monofilaments twist simultaneously silk boundling, are then heated synnema, drawing-off, coiling, and being made into has through certain weak twist
The integrated multifilament of obvolvent.This multifilament can be used for weaving liquid filtering net (cloth), can work out rope, can effectively improve
Endure hardships performance and the filter efficiency of filter cloth, improve the flexility and strength of rope.
The solution that the present invention uses in order to achieve the above objectives is: using the polytetrafluoroethylene (PTFE) with certain predetermined specification
Monofilament by twisting, drafting forming, oils, and silk, and the drawing-off of resintering knot, pine is viscous, receives made of the technical process such as silk, You Lianggen
The polytetrafluoroethylene (PTFE) multifilament that (including two) above monofilament is made up of weak twist obvolvent.
Polytetrafluoroethylene (PTFE) monofilament as used in the present invention be with certain continuous length, line density be 100 ~
The flat filament produced by different process or circle silk of 2000dtex, breaking strength >=3cN/dtex.
First step twisting of the invention, refers to and twists the polytetrafluoroethylene (PTFE) monofilament of selection, try hard to the twirl by twisting
Degree is twisted, and the obvolvent for increasing the fibril formed in monofilament by drawing-off reduces the easy fluffing of monofilament to increase the strength of monofilament
Property, while improving the wearability of monofilament, the twist is twisted 480 ~ 580, and orientation can be " S " according to product design and twist, and is also possible to
" Z " is twisted.
Second step drafting forming of the invention refers to and carries out heating drawing-off to preamble twisted monofilaments, and twisting is formed
Twirl line sizing is tried hard to give heated monofilament certain drafting force while twisting fixed text, elimination twirl stress, realize lower
Line density.It is formed in this process using intracavitary iron sheet type electric heating shaping equipment, monofilament reciprocating operation in the cavity, feeding operation
Speed is 1~3m/S, and be heated 1.6 ~ 2.4m of stroke, and heating temperature is 320 ~ 360 DEG C, drafting multiple 1.5 ~ 3.
Third step monofilament of the present invention oils, and refers to through the excessively oily device of silk thread, adds coating resistance to monofilament surface after sizing
High temperature finish, it is intended to reduce monofilament and generate mutually viscous connection in the hot gas spring after simultaneously silk boundling.
The 4th step of the present invention and silk are by the upper monofilament for crossing finish by the simultaneously progress of silk equipment and silk, and the silk twist is 160
~ 360 twist, and orientation is the reverse lay of twisted monofilaments.After twisted and silk, it is twisted into monofilament for by monofilament set fiber beam.
5th step of the invention heats drawing-off, and monfil beam made from preamble is entered heating drafting system and heats burning again
Drawing-off is tied, the present invention, which designs, uses the floated electric heating drafting system of cavate, the intracavitary reciprocal operation of synnema, the feeding speed of service 1~
3m/S, be heated stroke, 1.8 ~ 2.4m, and 350 ~ 380 DEG C of heating temperature, drafting multiple 1.2 ~ 2.
6th step pine of the invention is viscous, by the filament tow after drawing-off made from upper sequence, by a folding synchronous with wire winding device
It is loose viscous device (such as Fig. 2) to traction, the monofilament of the residual adhesion in hot melt drafting process is subjected to pine and is glued, the multifilament made
It is more soft, flexible.
7th step of the invention receives silk, is to synchronize to enter by tow of the pine after viscous to receive silk device, wrapping wire molding can obtain
Finished product polytetrafluoroethylene (PTFE) multifilament.
The present invention had passed through inventor's specific implementation already, and had case study on implementation to be illustrated.
Detailed description of the invention
The basic technology route map that Fig. 1 the invention patent product is realized；The multifilament pine that Fig. 2 the invention patent product is realized is viscous
Device.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment one
Step 1 is produced, line density 550dtex polytetrafluoroethylene (PTFE) monofilament using extrusion process, twisting, and twist 420T/m is twisted
To " S ".
Step 2, by by twisting after monofilament feed drafting-shaping device, monofilament sizing cavity in back and forth run away from
From 2.4m, feeding operation linear velocity 2m/S, drafting multiple 2, the monofilament that obtained line density is about 250 ~ 300dtex, monofilament surface
With twist line, about 280 ~ 300/m.
Step 3 is No. 2000 by viscosity to the polytetrafluoroethylene (PTFE) monofilament after step 2 drafting forming, heatproof
350 degree of extraordinary silicone oil oil box oils.
Step 3 takes 4, the monofilament after oiling, and passes through monofilament doubling frame doubling, 200 ~ 260T/m of the twist, orientation
“Z”。
Tow feeding heating drafting system after simultaneously silk is fed speed of service 1m/S, 1.2 times of drafting multiple, made by step 4
Obtain 1200 ± 100dtex/4F polytetrafluoroethylene (PTFE) secondary color.
Step 5: the multifilament that step 4 is produced, after Fig. 2 pine glues device, by adhesion in heating drafting process
Monofilament loosened after, using wrapping wire (line) device multifilament is completed into entire manufacture course of products around to finished product spool.
By test, finished product multifilament basic technical indicator are as follows:
Line density: 1230dtex/4F
Ultimate strength 42N
Breaking strength 4.2cN/dtex
Fracture elongation 4.6%
Dimensional stability to heating in house 2.8.
The above, only an example specific embodiment of the invention patent, but protection scope of the present invention is not limited to
In this, anyone skilled in the art is in the technical scope disclosed by this patent, the variation that can readily occur in or replaces
It changes, should be covered by the protection scope of the present invention.Therefore, the protection scope of this patent should be limited with claims
Protection scope subject to.
Claims (6)
1. polytetrafluoroethylene (PTFE) monofilament is twisted, after doubling boundling, then is led to by a kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof
Cross polytetrafluoroethylene (PTFE) multifilament made of heating, drawing-off, it is characterised in that: it is multifilament material that it, which is with polytetrafluoroethylene (PTFE) monofilament, is led to
Cross after single twisting, sizing, then monofilament carried out and silk is at tow, then tow is heated again, drawing-off, unsticking etc.
Process is made, and multifilament is by including two, but the multifilament boundling for being not limited to two is made, and has more better than manufacture monofilament
The density of fiber softening and weave, wearability can be used for weaving corrosive liquids filter cloth, make it have preferably
Strainability.
2. according to a kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof as described in claim 1, it is characterised in that monofilament refers to
The circular monofilaments for using " paste-extruded method " to produce or the flat monofilament of use " film cutting method " production are the basic material for manufacturing multifilament
Material.
3. according to a kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof as claimed in claim 2, it is characterised in that: will twisting list
Silk and silk refer to the monofilament of twisting carrying out the tow that reverse lay is merged into twirl using doubling equipment.
4. according to a kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof as described in claim 1, it is characterised in that: after simultaneously silk
Tow carry out heating drawing-off, refer to tow through heating device, in the case where heat hot melt state to tow progress drawing-off.
5. according to a kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof as described in claim 1, it is characterised in that: unsticking refers to
By the tow after drawing-off by the viscous device of pine, loose handling is carried out to the fibre bundle because of hot melt adhesion, makes to loosen between monofilament, subtract
Few adhesion, forms the multifilament for having weak twist.
6. according to a kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof as described in claim 1, it is characterised in that: described poly- four
Vinyl fluoride monofilament is not limited to the polytetrafluoroethylene (PTFE) monofilament produced using " paste-extruded method ", also should include using " film cutting method " work
The polytetrafluoroethylene (PTFE) flat monofilament of skill production.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910368081.3A CN110129933A (en) | 2019-05-05 | 2019-05-05 | A kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof |
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| CN201910368081.3A CN110129933A (en) | 2019-05-05 | 2019-05-05 | A kind of polytetrafluoroethylene (PTFE) multifilament and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113005545A (en) * | 2021-03-09 | 2021-06-22 | 山东森荣新材料股份有限公司 | Preparation method of polytetrafluoroethylene ultra-fine filament |
| CN113215672A (en) * | 2021-03-02 | 2021-08-06 | 上海灵氟隆膜技术有限公司 | Preparation method of polytetrafluoroethylene continuous filament for fuel cell diaphragm |
| CN115992407A (en) * | 2023-02-14 | 2023-04-21 | 灵氟隆新材料科技江苏有限公司 | Fluorinated branched chain-containing high-strength polytetrafluoroethylene filament and preparation and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113215672A (en) * | 2021-03-02 | 2021-08-06 | 上海灵氟隆膜技术有限公司 | Preparation method of polytetrafluoroethylene continuous filament for fuel cell diaphragm |
| CN113005545A (en) * | 2021-03-09 | 2021-06-22 | 山东森荣新材料股份有限公司 | Preparation method of polytetrafluoroethylene ultra-fine filament |
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| CN115992407A (en) * | 2023-02-14 | 2023-04-21 | 灵氟隆新材料科技江苏有限公司 | Fluorinated branched chain-containing high-strength polytetrafluoroethylene filament and preparation and application thereof |
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