CN108461181A - Foam PTFE insulated cable and preparation method thereof - Google Patents
Foam PTFE insulated cable and preparation method thereof Download PDFInfo
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- CN108461181A CN108461181A CN201810257050.6A CN201810257050A CN108461181A CN 108461181 A CN108461181 A CN 108461181A CN 201810257050 A CN201810257050 A CN 201810257050A CN 108461181 A CN108461181 A CN 108461181A
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- insulating layer
- layer
- insulated cable
- periphery
- foam
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Links
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 57
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 57
- 239000006260 foam Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000004020 conductor Substances 0.000 claims abstract description 30
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 229920002313 fluoropolymer Polymers 0.000 claims abstract description 12
- 238000001125 extrusion Methods 0.000 claims abstract description 7
- 238000009954 braiding Methods 0.000 claims description 25
- 239000002904 solvent Substances 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 18
- -1 Polytetrafluoroethylene Polymers 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 241001474791 Proboscis Species 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 8
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005187 foaming Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000010348 incorporation Methods 0.000 claims description 3
- 239000003208 petroleum Substances 0.000 claims description 3
- 150000001336 alkenes Chemical class 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 238000004891 communication Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 126
- 238000009413 insulation Methods 0.000 description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 239000004809 Teflon Substances 0.000 description 5
- 229920006362 Teflon® Polymers 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 240000002853 Nelumbo nucifera Species 0.000 description 4
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 239000004812 Fluorinated ethylene propylene Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920009441 perflouroethylene propylene Polymers 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 206010016654 Fibrosis Diseases 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000004761 fibrosis Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229920001774 Perfluoroether Polymers 0.000 description 1
- NEIHULKJZQTQKJ-UHFFFAOYSA-N [Cu].[Ag] Chemical compound [Cu].[Ag] NEIHULKJZQTQKJ-UHFFFAOYSA-N 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006664 bond formation reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
- H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/14—Insulating conductors or cables by extrusion
- H01B13/148—Selection of the insulating material therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
- H01B3/445—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Foam PTFE insulated cable and preparation method thereof, the insulated cable include：Inner wire；It is set to the extrusion bonding thin layer of inner wire periphery；It is set to the insulating layer of cohesive thin layer periphery, insulating layer is to stretch the expanded polytetrafluoroethyl(ne insulating layer pushed and formed；It is set to the outer conductor layer of insulating layer periphery；It is set to the restrictive coating of outer conductor layer periphery.The foam PTFE insulated cable of the present invention, coordinate the pushing die of special construction using traction drawing process, superelevation expanded polytetrafluoroethyl(ne insulating layer can be formed, to reduce the dielectric constant of insulating layer, cable is made to have the characteristics that communication frequency height, ultra-low loss, stable mechanical performance.Increase heat safe fluoroplastics between inner wire and insulating layer simultaneously and bonds thin layer, improve the mechanical strength of insulating layer, keep the adherency of inner wire and insulating layer even closer, so that inner wire and insulating layer is kept mutual stability when by mechanical force, improves the stability of cable electrical performance.
Description
Technical field
The invention belongs to aviations and technology for radio frequency field, more particularly, to a kind of superelevation expanded polytetrafluoroethyl(ne
Insulated cable and preparation method thereof.
Background technology
With the fast development of microwave communication techniques, more stringent requirements are proposed to radio frequency traditional element for machine system.It is poly-
Tetrafluoroethene insulated cable has excellent high-temperature stability and high power characteristic, is influenced by environmental change small, exists at present
Machine system and aviation field are used widely.
Typical aviation is made of with high-temperature coaxial cable inner wire, insulating layer, outer conductor and sheath.Conventional cable is exhausted
Edge layer is generally lapping structure or pushes structure.Traditional twining package tape wrapping insulation layer using low-density polytetrafluoroethylene tape around
Packet, traditional pushing insulating layer use solid core or lotus root core (the vertical hole formula lotus root core with the air gap) structure.Low-density polytetrafluoroethyl-ne
Alkene band lapped insulation is phase-compensated cable structure, has temperature phase stability features, but low-density polytetrafluoroethylene tape is wrapped absolutely
The mechanical strength of edge layer is relatively poor, from experience mechanical external force and when deforming upon, when such as squeezing, stretching, low-density poly- four
Vinyl fluoride can cause structure size to be changed with dielectric material due to by mechanical stress, cause the electrical length of cable to occur corresponding
Variation, to bring the characteristic impedance of cable and the variation of voltage standing wave ratio, electric property fluctuation larger.Using pushing, structure is exhausted
The cable of edge layer is opposite to be made moderate progress using the cable machinery intensity of lapping structure insulating layer, but solid core pushes the electricity of insulation system
Cable attenuation constant index is larger, although the cable that lotus root core pushes insulation system can improve attenuation constant, obtains low loss cable,
Its air gap degree is up to 65%, and its longitudinal direction prevents water penetration that performance is poor, and there are still the skies further improved for cable performance
Between.
Application No. is 201510523957.9 Chinese invention patent applications to disclose a kind of light-duty wide temperature leakage of flexibility together
Shaft cable is pushed the insulating layer for stretching expanded polytetrafluoroethyl(ne technology and forming cable using high temperature, reduced to a certain extent
The dielectric constant and dielectric loss of cable, improve the electric property of cable.But the dielectric constant of the cable still up to 1.55, and
And it is easy to tear off loosely, simultaneously when by outer longitudinal mechanical stress without adhesive layer in the expanded polytetrafluoroethyl(ne insulating layer
Since the adhesion strength of inner wire and insulation interlayer is small, electric property fluctuation is larger.Therefore, in order to reach cable by mechanical force shadow
Electric property keeps stable requirement in the case of sound, it is still necessary to the more stable teflon cable of design structure.
Invention content
A kind of stablize the object of the present invention is to provide structure and electric property foam PTFE insulated cable and its
Preparation method can ensure the stabilization of cable electrical performance when by mechanical stress.
To achieve the goals above, the present invention takes following technical solution：
Foam PTFE insulated cable, including：Inner wire；The extrusion bonding for being set to the inner wire periphery is thin
Layer；It is set to the insulating layer of the cohesive thin layer periphery, the insulating layer is that the expanded polytetrafluoroethyl(ne that stretching pushing is formed is exhausted
Edge layer；It is set to the outer conductor layer of the insulating layer periphery；It is set to the restrictive coating of the outer conductor layer periphery.
More specifically, the foam degrees of the insulating layer are more than 80%.
More specifically, the cohesive thin layer is that the fluoroplastics squeezed out bond thin layer.
More specifically, the thickness of the cohesive thin layer is 0.03~0.1mm.
More specifically, the outer conductor layer is made of interior braiding layer and outer braiding layer, and the interior braiding layer is metal flats band
Braiding either circle soft annealed wire braiding or metal foil longitudinal wrap overlap, the outer braiding layer be circle soft annealed wire braiding and
At.
The preparation method of aforementioned foam PTFE insulated cable, includes the following steps：
Inner wire is provided；
It is extruded into cohesive thin layer in inner wire periphery；
Expanded polytetrafluoroethyl(ne insulating layer is formed bonding the stretching pushing of thin layer periphery；
Outer conductor layer is formed in insulating layer periphery；
Restrictive coating is formed in outer conductor layer periphery.
More specifically, the cohesive thin layer is extruded into through tubular molding tool in inner wire periphery by fluoroplastics material.
More specifically, the tubular molding tool includes die sleeve and proboscis mold core, the proboscis mold core be set in die sleeve and
Mold core mouth is concordant with the die sleeve mouth of die sleeve.
More specifically, the step of forming expanded polytetrafluoroethyl(ne insulating layer is as follows：
Polytetrafluoroethylene (PTFE) is mixed with solvent naphtha；
Material after mixing is preforming at a temperature of 20~30 DEG C；
Material after will be preforming is sent into insulating layer extruding machine to be squeezed out through pushing die, and hair is formed bonding thin layer periphery
Teflon insulation layer is steeped, core wire is drawn by traction stretching device during pushing, and rate of extension is 5~50m/min；
The core wire of insulating layer is formed successively by volatilization case and sinter box, carries out solvent volatilization, drying, sintering and crystallization,
Then subsequent processing is sent into winding, sabot.
More specifically, when polytetrafluoroethylene (PTFE) is mixed with solvent naphtha, the quality of solvent naphtha account for material gross mass 15%~
30%.
More specifically, the solvent naphtha is petroleum ether or gasoline.
More specifically, polytetrafluoroethylene (PTFE) dispersion powders and solvent naphtha are added in sealing container, it at ambient temperature will be close
Sealing container, both horizontally and vertically alternate cycles are swung, and incorporation time is not less than 20 hours.
More specifically, temperature when core wire is dried in sinter box is 100~250 DEG C, temperature when being sintered
It is 300~400 DEG C.
More specifically, the pushing die includes die sleeve and the mould needle that is set in the die sleeve, the work of the die sleeve
Face length is 20~30mm.
By above technical scheme it is found that the foam PTFE insulated cable of the present invention, is stretched using improved traction
Technique forms the teflon insulation layer of superelevation foaming, and the teflon insulation layer inner homogeneous after pushing is stretched through traction
Gather many microscopic pinholes, its dielectric constant is made to be decreased obviously, to make cable have communication frequency height, ultra-low loss, machinery
The feature that performance is stablized.And push technique, coefficient of thermal expansion since superelevation expanded polytetrafluoroethyl(ne insulating layer uses stretching
Very small, the sintering through temperature gradients formula after stretching improves the resistance to cracking of expanded polytetrafluoroethyl(ne insulating layer, by the external world
Under the conditions of mechanical stress, the change in dielectric constant of insulating layer is very small, has stable insulation system.The present invention is led inside simultaneously
Increase heat safe extrusion bonding thin layer between body and insulating layer, improve the mechanical strength of insulating layer, make inner wire with absolutely
The adherency of edge layer is even closer, and inner wire and insulating layer is made to keep mutual stability when by mechanical force, to reduce
Relative movement is generated between inner wire and insulating layer under the conditions of mechanical stress, with the characteristic that electric property is stablized, can be obtained
Obtain the high temperature-resistant cable product that electric property is stablized.
Description of the drawings
It in order to illustrate the embodiments of the present invention more clearly, below will be to required use in embodiment or description of the prior art
Attached drawing do simple introduction, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the structural schematic diagram of cable of the embodiment of the present invention；
Fig. 2 is the section structural schematic diagram of cable of the embodiment of the present invention；
Fig. 3 is the apparatus for production line rough schematic view of the expanded polytetrafluoroethyl(ne insulating layer of cable of the embodiment of the present invention；
Fig. 4 is the production technological process of the expanded polytetrafluoroethyl(ne insulating layer of cable of the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of tubular molding tool；
Fig. 6 is the structural schematic diagram of pushing die.
Specific implementation mode
In order to which above and other objects of the present invention, feature and advantage can be become apparent from, the embodiment of the present invention cited below particularly,
It is described below in detail.
As depicted in figs. 1 and 2, foam PTFE insulated cable includes from inside to outside inner wire 1 successively, bonds thin layer
2, insulating layer 3, outer conductor layer and restrictive coating 6.The outer conductor layer of the present embodiment is made of interior braiding layer 4 and outer braiding layer 5.
Inner wire 1 can be single-wire or metallic cable or metal tube, it is preferred that inner wire 1 is silver-coated copper wire or plating
Silver-bearing copper steel clad wire or silver-plated copper coating aluminum line.
The periphery that thin layer 2 is coated on inner wire 1 is bonded, it is that the thermostable fluorine plastics squeezed out bond thin layer to bond thin layer 2.
Insulating layer 3 is superelevation expanded polytetrafluoroethyl(ne insulating layer, is set to the periphery containing the inner wire 1 for bonding thin layer 2,
Insulating layer 3 is pushed using low polytetrafluoroethylene (PTFE) (PTFE) material stretching of dielectric constant, can reduce the loss of cable, together
When polytetrafluoroethylene (PTFE) foaming structure can reduce the density of material of insulating layer, obtain lower effective dielectric constant.The present invention's
The foam degrees of insulating layer 3 are more than 80%, and the effective dielectric constant of insulating layer 3 is not less than 1.50, and transmission rate may be up to 90%.
Interior braiding layer 4 is set to the periphery of insulating layer 3, and interior braiding layer 4 is that metal flats band weaves or circle soft annealed wire is compiled
It knits or metal foil longitudinal wrap overlaps.Outer braiding layer 5 is set to the periphery of interior braiding layer 4, and outer braiding layer 5 is circle soft annealed wire
It weaves, is such as woven by tinned wird or silver-coated copper wire.The count of outer braiding layer 5 is not less than 90%, to ensure
The electric property and stable mechanical performance of cable.
Restrictive coating 6 is set to the periphery of outer braiding layer 5, and restrictive coating 6 can be tubular structure, and protection is played in use environment
The effect of cable can also be such that the outer conductor layer of cable more stablizes, ensure the electric property of cable.More specifically, restrictive coating 6
The coating of the sheaths grades such as fluorinated ethylene propylene copolymer (Fluorinated ethylene propylene, abbreviation FEP) can be used
Material is made.In order to ensure the stability of the construction of cable and transmission characteristic, FEP restrictive coatings are made using crowded tubular type processing technology,
To make restrictive coating that there is preferable mechanical performance and high flame retardant, it is ensured that in cable mechanical strength and the safety that uses
Property.
The preparation method of superelevation foam PTFE insulated cable of the present invention includes the following steps：
Inner wire is provided；As shown in figure 3, coiled silver-copper plated steel clad wire or silver-coated copper wire or other wire conductors are existed
It is released on the pay off rack of paying out machine 100, payingoff speed is controlled by the tension roller of tension force platform 101, by sizing die drawing
The inner wire met the size requirements is made, is preheated using preheater 102；
In inner wire periphery extrusion bonding thin layer；Inner wire after preheating is used by bonding thin layer extruding machine (not shown)
Heat safe fluoroplastics push out one layer of cohesive thin layer in inner wire periphery, and fluoroplastics can be tetrafluoroethene-perfluoro alkoxy second
Alkenyl ether copolymer (PFA) etc.；
It pushes to form insulating layer containing the inner wire out-draw for bonding thin layer with superelevation expanded polytetrafluoroethyl(ne；It is thin containing bonding
The inner wire of layer is drawn through insulating layer extruding machine 103 by wheeled traction stretching device 104, and superelevation expanded polytetrafluoroethyl(ne is through drawing
It stretches pushing and is bonding formation superelevation foaming insulation layer outside thin layer, then solvent is vapored away by volatilization case 105, enters back into sintering
Case 106 is sintered, and so that the insulating layer to be formed is had certain intensity, and wound by winder 107；
It is knitted to form outer conductor layer in insulating layer periphery；The preparation process of outer conductor layer is existing common process, can use gold
Either the braiding of circle soft annealed wire or metal foil longitudinal wrap are overlapped on outside insulating layer braiding layer in formation to the braiding of category bandlet, with circle metal
Line is knitted to form outer layer outer conductor in the periphery of internal layer outer conductor；But the outer conductor of the coaxial cable of different configuration can also be pipe
The outer conductor of shape；
Restrictive coating is formed in outer conductor layer periphery；The preparation process of restrictive coating is also existing common process, will be formed with outer
The cable of conductor layer passes through sheath extrusion dies, forms the sheath protective layer for being wrapped in the tubulose outside outer conductor layer, cooling and solidifying
Afterwards, by tension roller by cable winding on coil holder, carry out outer packing after it is offline.
The bonding thin layer of the present invention is extruded into through tubular molding tool in inner wire periphery by fluoroplastics material, bonds thin layer
Thickness be 0.03~0.1mm.Tubular molding tool is installed on extruding machine, as shown in figure 5, tubular molding tool includes 11 He of die sleeve
Proboscis mold core 12, proboscis mold core 12 are set in die sleeve 11, and the mold core mouth of proboscis mold core 12 is concordant with the die sleeve mouth of die sleeve 11, interior
Conductor is pierced by out of proboscis mold core 12, and fluoroplastics material is coated on inner wire outer surface via the extrusion of die sleeve 11.Tubular molding tool
Fluoroplastics material can be made to form uniform tubular before extruding, redraw cladding in the conductor.The present invention is using the side squeezed out
Formula is formed by cohesive thin layer outside inner wire, and thickness is uniform, and adhesion strength consistency is good, is glued with traditional coated in insulating tape
The mode of knot agent is compared, and the adhesion strength for improving inner wire and the interlayer that insulate (is not less than 20N, in traditional coated with adhesive technique
Conductor is only not less than 3N with insulation interlayer adhesion force), and due to fluoroplastics bond thin layer increase insulating layer and inner wire it
Between adhesion strength, can prevent PTFE and inner wire from generating and substantially slide, can slow down in cable bending process inner wire plus
Work hardenability improves the mechanical strength and crack resistance of insulating layer so as to improve the flexural property of cable, and stretching is made to foam
Insulating layer not will produce loose phenomenon when being acted on by mechanical stress, and can realize automatic cutting line.In project installation connector,
The mode of traditional coated with adhesive in insulation band, since binder and inner wire glue very tight, binder not easy-clear,
And the pushing of the present invention bonds thin layer by pushing technique to adjust the adhesive force of insulating layer and inner wire, therefore inner wire is easy
It is stripped clean, is easily installed use.
Fig. 4 is the production technological process of superelevation expanded polytetrafluoroethyl(ne insulating layer, as shown in figure 4, in the thin layer containing bonding
Inner wire on formed superelevation expanded polytetrafluoroethyl(ne insulating layer the step of it is as follows：
Polytetrafluoroethylene (PTFE) is mixed with solvent naphtha, solvent naphtha has the function of lubrication, it is possible to reduce push away as auxiliary agent
Extruding force；More specifically, the incorporation time of polytetrafluoroethylene (PTFE) and solvent naphtha is not less than 20 hours, and solvent naphtha can be petroleum ether or vapour
PTFE dispersion powders and solvent naphtha are added in sealing container oil, at ambient temperature that sealing container is in the horizontal direction and vertical
Histogram is swung to alternate cycles, so that PTFE dispersion powders and solvent naphtha is uniformly mixed, by sealing container in two freedom degree directions
On carry out rotation batch mixing, mixed effect can be made more preferable, and prevent resin fibre, while mixing time can be shortened, improve life
Produce efficiency；When mixing, the quality of solvent naphtha account for material gross mass (quality+solvent naphtha of material gross mass=polytetrafluoroethylene (PTFE)
Quality) 15%~30%；
Material after mixing is carried out at a temperature of 20~30 DEG C preforming；It is pre-formed as pushing the routine of technique
Step；
Material after will be preforming is sent into insulating layer extruding machine, is squeezed out through pushing die, the pre- of insulating layer extruding machine pushes away
During pushing, core wire is drawn by wheeled traction stretching device stick simultaneously, is drawn stretching device traction core wire by control and is moved
Dynamic speed (i.e. rate of extension) to improve the foam degrees of Teflom Insulation Material, while being stretched by drawing so that poly-
The molecule segment distance of tetrafluoroethene insulating materials becomes larger, after distance becomes larger between molecule segment, between polytetrafluoroethylene (PTFE) molecule
Become fluffy so that air can enter the gap between macromolecular, foaming degree enhancing；Winder 106 at take-up can be protected
The uniform and stable production of whole production line is demonstrate,proved, while ensureing that core insulation will not be broken, outer diameter is stablized；The rate of extension of the present invention
For 5~50m/min (m indicates that unit rice, min indicate unit minute), when cable specification difference, rate of extension can be adjusted；
The core wire for forming insulating layer enters in volatilization case, solvent naphtha is volatilized completely so that core wire surface rounding is smooth；
After solvent naphtha volatilization completely, core wire enters in sinter box, and dry section, sintering zone and cooling zone are divided into sinter box,
Core wire is dried in dry section, and drying temperature is 100~250 DEG C, is sintered and crystallizes after dry, is sintered in sintering zone
Interior progress, crystallization carry out in sintering zone and cooling zone, and sintering temperature is 300~400 DEG C；
Finally by winder winding, sabot, it is sent into subsequent processing.
The insulating layer of the present invention is formed using pushing die in bonding thin layer periphery, as shown in fig. 6, pushing die includes mould
Set 21 and mould needle 22, mould needle 22 is the cylinder type hollow pipe across die sleeve 21, for ensureing that inner wire passes through extruding machine.Mould
Set 21 has horizontal working face s.In order to make polytetrafluoroethylene (PTFE) carry out effective fibrosis, pushing die of the invention is in routine
It is improved in pushing die structure, the face length of die sleeve 21 is 20~30mm, than the work of die sleeve in conventional pushing die
It is longer to make face, so as to make the polytetrafluoroethylene fibre time longer, fibrosis higher, to prevent insulating layer from being drawn
It stretches process interrupt to split, obtains high foaming rate.
Below by taking a specific application examples as an example, the concrete structure and effect of the present embodiment are explained in detail,
Have solid core PTFE insulating layers, lotus root core PTFE insulating layers and low density PTFE band wrapped on embodiment cable and conventional simultaneously
The cable of insulating layer carries out the test of electric property and mechanical strength, the concrete structure and test result such as table of above four kinds of cables
Shown in 1：
Table 1
By the test result of table 1 it is found that the foam PTFE insulated cable of the present invention has ultra-low loss, electrical resistance
It can be better than existing conventional insulated cable, while there is higher mechanical strength.The present invention is foamed using the superelevation pushed is stretched
Teflon insulation layer structure, while squeezing out one layer of heat safe fluoroplastics between inner wire and insulating layer and bonding thin layer,
Inner wire and insulation interlayer adhesion force are improved, outer conductor layer forms reinforcing layer outside insulating layer, is risen to cable configuration
To stabilization is reinforced, the pushing structure of insulating layer ensure that the stability of cable insulation internal structure so that in cable machinery
Inner wire will not occur when resistance to compression or bending and not will produce relative displacement and deformation with insulation, to ensure that the electrical resistance of cable
Stabilizability.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to embodiment illustrated herein, and is to fit to consistent with the principles and novel features disclosed in this article
Widest range.
Claims (14)
1. foam PTFE insulated cable, which is characterized in that including：
Inner wire；
It is set to the extrusion bonding thin layer of the inner wire periphery；
It is set to the insulating layer of the cohesive thin layer periphery, the insulating layer is that the expanded polytetrafluoroethyl(ne that stretching pushing is formed is exhausted
Edge layer；
It is set to the outer conductor layer of the insulating layer periphery；
It is set to the restrictive coating of the outer conductor layer periphery.
2. foam PTFE insulated cable as described in claim 1, it is characterised in that：The foam degrees of the insulating layer are big
In 80%.
3. foam PTFE insulated cable as described in claim 1, it is characterised in that：The cohesive thin layer is to squeeze out
Fluoroplastics bond thin layer.
4. the foam PTFE insulated cable as described in claim 1 or 3, it is characterised in that：The thickness of the cohesive thin layer
Degree is 0.03~0.1mm.
5. foam PTFE insulated cable as described in claim 1, it is characterised in that：The outer conductor layer is by interior braiding
Layer and outer braiding layer are constituted, and the interior braiding layer is that either the braiding of circle soft annealed wire or metal foil longitudinal wrap are taken for metal flats band braiding
It connects, the outer braiding layer is that circle soft annealed wire weaves.
6. the preparation method of the foam PTFE insulated cable such as any one of claim 1 to 5, which is characterized in that including
Following steps：
Inner wire is provided；
It is extruded into cohesive thin layer in inner wire periphery；
Expanded polytetrafluoroethyl(ne insulating layer is formed bonding the stretching pushing of thin layer periphery；
Outer conductor layer is formed in insulating layer periphery；
Restrictive coating is formed in outer conductor layer periphery.
7. the preparation method of foam PTFE insulated cable as claimed in claim 6, it is characterised in that：The bonding is thin
Layer is extruded into through tubular molding tool in inner wire periphery by fluoroplastics material.
8. the preparation method of foam PTFE insulated cable as claimed in claim 7, it is characterised in that：The crowded tubular type
Mold includes die sleeve and proboscis mold core, and the proboscis mold core is set in die sleeve and mold core mouth is concordant with the die sleeve mouth of die sleeve.
9. the preparation method of foam PTFE insulated cable as claimed in claim 6, it is characterised in that：It is poly- to form foaming
The step of tetrafluoroethene insulating layer, is as follows：
Polytetrafluoroethylene (PTFE) is mixed with solvent naphtha；
Material after mixing is preforming at a temperature of 20~30 DEG C；
Material after will be preforming is sent into insulating layer extruding machine to be squeezed out through pushing die, is gathered bonding thin layer periphery and being formed to foam
Tetrafluoroethene insulating layer, core wire is drawn by traction stretching device during pushing, and rate of extension is 5~50m/min；
The core wire of insulating layer is formed successively by volatilization case and sinter box, carries out solvent volatilization, drying, sintering and crystallization, then
Subsequent processing is sent into winding, sabot.
10. the preparation method of foam PTFE insulated cable as claimed in claim 9, it is characterised in that：Polytetrafluoroethyl-ne
When alkene is mixed with solvent naphtha, the quality of solvent naphtha accounts for the 15%~30% of material gross mass.
11. the preparation method of the foam PTFE insulated cable as described in claim 9 or 10, it is characterised in that：It is described
Solvent naphtha is petroleum ether or gasoline.
12. the preparation method of the foam PTFE insulated cable as described in claim 9 or 10, it is characterised in that：It will gather
Tetrafluoroethene dispersion powders and solvent naphtha are added in sealing container, at ambient temperature in the horizontal direction and vertically by sealing container
Direction alternate cycles are swung, and incorporation time is not less than 20 hours.
13. the preparation method of foam PTFE insulated cable as claimed in claim 9, it is characterised in that：Core wire is being burnt
Temperature when being dried in knot case is 100~250 DEG C, and temperature when being sintered is 300~400 DEG C.
14. the preparation method of foam PTFE insulated cable as claimed in claim 9, it is characterised in that：The pushing
Mold includes die sleeve and the mould needle that is set in the die sleeve, and the face length of the die sleeve is 20~30mm.
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| CN108461181B (en) | 2024-05-28 |
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