CN101339827A - Coaxial cord, manufacturing method thereof, and multi-core coaxial cord - Google Patents
Coaxial cord, manufacturing method thereof, and multi-core coaxial cord Download PDFInfo
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- CN101339827A CN101339827A CNA2008101278470A CN200810127847A CN101339827A CN 101339827 A CN101339827 A CN 101339827A CN A2008101278470 A CNA2008101278470 A CN A2008101278470A CN 200810127847 A CN200810127847 A CN 200810127847A CN 101339827 A CN101339827 A CN 101339827A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/1834—Construction of the insulation between the conductors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
- H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
- H01B11/20—Cables having a multiplicity of coaxial lines
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- 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
- H01B13/016—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing co-axial cables
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- 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
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Abstract
The invention provides a coaxial cable possessing internal conductor, internal insulation layer covered with the conductor, external conductor disposed outside of the internal insulation layer and external insulation layer covered with the external conductor. In the coaxial cable, internal insulation layer, external insulation layer or two of these are made of ionomer resin composition containing ethene series ionomer resin and organic clay. In addition, the present invention provides not only method for manufacturing the coaxial cable, but multi-core coaxial cable containing the coaxial cable. The coaxial cable is compatible in mechanical property and reduction of wall thickness of insulation layer and the diameter is reduced, in addition the coaxial cable has excellent flexible property.
Description
Technical field
The present invention relates to coaxial cord, the manufacture method of this coaxial cord and the multicore coaxial cable that contains described coaxial cord applicable to the internal wiring of portable electron device etc.
Background technology
People require to reduce the diameter of the coaxial cord that uses in the internal wiring of portable electron device (for example mobile phone), this is because will place many coaxial cords in limited space.People also require electric wire to have excellent shielding properties, so that suppress the electromagnetic interference (EMI) that electromagnetic wave produced by the high-frequency signal beta radiation.
Such coaxial cord is disclosed in patent documentation 1.Disclosed electric wire has following structure:
(a) inner conductor, it is formed by single line or twisted wire,
(b) insulating barrier, its (for example) are to be formed by the fluororesin that covers described conductor,
(c) external conductor, it is to form by electric wire is covered on the described insulating barrier with short as far as possible pitch helically twisted, and
(d) insulating barrier, its (for example) are to be formed by the fluororesin that covers described external conductor.
The document shows with the example of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) as described fluororesin.
Patent documentation 2 discloses and has used porous polypropylene film or the polyester film coaxial cord as insulating barrier.Disclosed electric wire for example has following structure (referring to the embodiment 1 of the document):
(a) inner conductor, it is formed by twisted wire,
(b) insulating barrier, it is to be that 25 μ m, width are that stacked the covering on the described conductor of banded porous polypropylene film helically of 5mm forms by adopting half overlapping method with thickness,
(c) external conductor, it forms on described insulating barrier, and
(d) external insulation, it covers described external conductor.
Patent documentation 1: Japanese Patent Application Publication spy opens 2006-252937
Patent documentation 2: Japanese Patent Application Publication spy opens flat 5-54729
Summary of the invention
People require to reduce the diameter of the coaxial cord that (for example) use in the internal wiring of portable electron device.In order to satisfy this requirement, not only need to reduce the diameter of its inner conductor, but also need reduce the wall thickness of internal insulating layer and external insulation (outer cover).In order to reduce the diameter of inner conductor, require to take into account simultaneously the drawing property and the hot strength of electric wire.In order to reduce the wall thickness of internal insulating layer and external insulation, need to obtain the compatibility between degree and the mechanical performance of reducing of insulating barrier wall thickness.
Under the situation of using the fluororesin such as PFA,, therefore when extruding, be difficult to when the charging rate that makes electric wire remains unchanged, can also make wall thickness to reduce owing to be subjected to the restriction of melting behaviour.Therefore, extrude the problem that can cause productivity ratio to reduce in the mode that reduces wall thickness.In addition, fluororesin has the low and low shortcoming of mechanical strength of modulus of elasticity.Therefore, when the wall thickness of insulating barrier reduced, in the manufacturing and distribution operating process of coaxial cord, external insulation and internal insulating layer all may be owing to external force is damaged.When this thing happens, may cause short circuit between inner conductor and the external conductor.
In addition, the coaxial cord position that is bent or twists through being commonly used in electric wire.Therefore, need electric wire to have good distortion performance.As mentioned above, the mechanical strength of fluororesin is low.Therefore, when the wall thickness of insulating barrier reduced, in the distortion test, the number of twists of distortion coaxial cord when conductor break significantly reduced.
As described in patent documentation 2, when insulating barrier is when forming by stacked resin film band, wall thickness is easy to reduce.Yet with respect to the process velocity of electric wire, the stacked process of band is slowly.Therefore, productivity ratio reduces.In addition, and have by coaxial cord resin extruded and that cover the insulating barrier that forms on the bottom component is compared, this electric wire has the shortcoming of distortion poor performance.
The purpose of this invention is to provide a kind of like this coaxial cord, this coaxial cord not only can reduce the diameter of electric wire by the compatibility between the mechanical performance that reduces degree and electric wire that obtains the insulating barrier wall thickness, and have excellent distortion performance, a multicore coaxial cable that the present invention also provides the manufacture method of described coaxial cord and contains this coaxial cord.
The inventor has carried out deep research and has obtained following the discovery the problems referred to above.Promptly, when internal insulating layer or external insulation are by the ionomer resin composition being extruded when forming, even can obtain still to have the coaxial cord of the excellent mechanical strength and the distortion performance of excellence when insulating barrier has the wall thickness that reduces, wherein said ionomer resin composition is by being dispersed in the ionomer resin and making through the clay (hereinafter being called " organic clay ") that organic compound was handled.Thus, finish the present invention.
The invention provides a kind of coaxial cord, it has following structure:
(a) inner conductor,
(b) internal insulating layer of covering inner conductor,
(c) be positioned at the outer external conductor of internal insulating layer, and
(d) external insulation of covering external conductor.
In described coaxial cord, internal insulating layer, external insulation or these two are to be that the ionomer resin composition of ionomer resin and organic clay is made by containing ethene.
When organic clay being scattered in ethene is in the ionomer resin time, and modulus of elasticity and melting behaviour improve.This improvement makes it possible to extrude in the mode that reduces wall thickness.As a result, not only can reduce the diameter of described coaxial cord, and can improve the distortion performance of this coaxial cord.
In these cases, it is desirable to, organic clay accounts at least 2 weight % and maximum 60 weight % of whole ionomer resin compositions.When satisfying above-mentioned condition, can take into account the effect of mechanical performance improvement simultaneously and extrude processing characteristics.When by inserting when forming described organic clay, improved the dispersiveness of organic clay in ionomer resin by dioctadecyl dimethyl ammonium chloride, two octadecyl benzyl dimethyl ammonium chloride or organic compound intercalation that these two constitutes.The improvement of this dispersiveness can make the rigidity of resin combination conversely and the processing characteristics of extruding when extruding in the mode that reduces wall thickness improves.
It is desirable to, the ionomer resin composition also comprises the alkoxy silane with two keys, and is ionomer resin with respect to the ethene of per 100 weight portions, and the amount of described alkoxy silane is at least 0.2 weight portion and maximum 10 weight portions.Contain the crosslink density that the alkoxy silane with two keys can increase the ionomer resin composition, thereby strengthen thermal endurance.
It is desirable to, adopt ionization radial line to shine and make the ionomer resin composition crosslinked.The crosslinked thermal endurance that can strengthen coaxial cord takes place in ionomer resin.
It is desirable to, the external diameter of external insulation mostly is 0.22mm most.The external diameter of external insulation is equal to the diameter of the coaxial cord that is made of inner conductor, internal insulating layer, external conductor and external insulation.When the external diameter of external insulation mostly was 0.22mm most, the circuit in the electronic installation can be finer and close.
The present invention also provides a kind of method of making coaxial cord, and this method may further comprise the steps:
(a) preparation inner conductor,
(b) by being extruded and cover, first resin combination forms internal insulating layer on the inner conductor,
(c) external conductor is set on internal insulating layer, and
(d) by being extruded and cover, second resin combination forms external insulation on the external conductor.
In described coaxial cord, first resin combination, second resin combination or these two are to contain the ionomer resin composition that ethene is ionomer resin and organic clay.When extruding the ionomer resin composition and form internal insulating layer, external insulation or these two, can form insulating barrier with high electric wire charging rate, improve productivity ratio thus.
The present invention also provides the multicore coaxial cable of the coaxial cord with many basic inventions.This multi-core coaxial electric wire (for example) is to form like this: thus many parallel to each other the arranging of coaxial cord are formed row, then with the part of the common electric wire of coverings such as shell through arranging.Adopt above-mentioned structure, can make multicore coaxial cable with excellent mechanical performance and distortion performance.
According to the present invention, can extrude with high electric wire charging rate and the mode that reduces wall thickness and form internal insulating layer and external insulation.In addition, mechanical strength and diameter reduce degree can be taken into account simultaneously, thereby can make the coaxial cord with excellent distortion performance.In addition, can also make the multicore coaxial cable that contains described coaxial cord.
Embodiment
Ethene used in the present invention is that ionomer resin is to make by metal ion (for example zinc ion, potassium ion, sodium ion, calcium ion or magnesium ion) to form the crosslinked resin for preparing between the molecule of ethylene copolymer (for example ethylene-methacrylic acid copolymer or ethylene-acrylic acid copolymer).Above-mentioned ethene is that ionomer resin (for example) can be with trade name Surlyn (registered trade mark) or Himilan (registered trade mark) and the commercially available resin of selling that gets.
Except above-mentioned ethene was ionomer resin, the ethene that uses among the present invention was that the type of ionomer resin comprises that the ethylene copolymer by having carboxyl in the molecule mixes the resin that obtains with metal oxide, metal hydroxides or slaine.When the ethylene copolymer that will have carboxyl and slaine etc. mixed, carboxyl was neutralized by metal ion and becomes carboxylic acid ion, forms salt with metal ion thus.When a plurality of carboxylic acid ions during by metal ion and bonding, ethylene copolymer is cross-linked with each other, and forms ionomer resin thus.
The type that has the ethylene copolymer of carboxyl in the molecule for example comprises: ethene and the copolymer of acrylic monomers (for example acrylic acid and the methacrylic acid) formation with carboxyl and the copolymer of ethene and anhydride monomers (for example maleic anhydride) formation.These copolymers can make by adopting known method (for example copolymerization process or glycerol polymerization method).In order to improve various performances, as required, can also add other monomer by copolymerization.
Have in above-mentioned molecule in the ethylene copolymer of carboxyl, it is desirable to, the content of carboxyl is 0.5 mole of % to 50 mole of %, and that better is 1 mole of % to 30 mole of %.If this content is lower than 0.5 mole of %, then the rigidity of resin combination reduces, and extrudes poor processability.If this content is higher than 50 moles of %, then electrolyte resistance variation.The type of above-mentioned ethylene copolymer for example comprises: ethylene-acrylic acid copolymer and ethylene-methacrylic acid copolymer, wherein the copolymerization percentage of acrylic monomers is 5% to 30%.Described ethylene copolymer (for example) can be the commercially available copolymer of selling with trade name Nucrel (registered trade mark) or Primacor (registered trade mark) that gets.
Part or all of carboxyl in the ionomer resin composition neutralizes by the metal ion in metal oxide etc. or by the metal ion in the organic clay.It is desirable to, in the ionomer resin composition 55% or more carboxyl be neutralized, this is because this condition can make rigidity strengthen.The degree of neutralization of carboxyl is represented with the ratio of carboxyl total amount in amount that Ionized carboxyl (carboxylic acid ion) takes place and the ionomer resin composition.This ratio can obtain by measuring infrared absorption spectroscopy (IR).Carboxyl is 1,700cm
-1Near have the flexible absworption peak of C=O key.But, when this group is neutralized by metal ion and when becoming carboxylic acid ion, this absworption peak disappears.When with hydrochloric acid (it is a strong acid) carboxylic acid ion that produces by the metal ion neutralization being handled, metal ion breaks away from, and carboxylic acid ion is converted into initial carboxyl like this.As a result, the flexible absworption peak of C=O key appears.When the height of the flexible absworption peak of the C=O key of ionomer resin composition is measured, can measure the amount that Ionized carboxyl does not take place.When measuring, can measure the carboxyl total amount in the ionomer resin composition with the height of the flexible absworption peak of C=O key of the ionomer resin composition of salt acid treatment.When these two mensuration are all finished, can obtain degree of neutralization.More specifically, adopt following formula to calculate degree of neutralization.
Degree of neutralization (%)=(1-A
1/ A
2) * 100
Wherein:
A
1: the height of the flexible absworption peak of the C=O key of ionomer resin composition.
A
2: with the height of the flexible absworption peak of C=O key of the ionomer resin composition of salt acid treatment.
Be used for and molecule in have an ethylene copolymer of carboxyl the type of reagent comprise metal oxide, metal hydroxides and metal carbonate, these reagent for example are: zinc oxide, magnesium oxide, magnesium hydroxide, NaOH, sodium acid carbonate, calcium oxide, calcium hydroxide, calcium carbonate, potassium hydroxide and saleratus.It is desirable to, be used for and the metal ion of carboxyl is at least a ion that is selected from zinc ion, sodium ion, magnesium ion, potassium ion and the calcium ion.When satisfying this condition, described resin combination has excellent transparency.In addition, also it is desirable to, with respect to the ethylene copolymer with carboxyl of per 100 weight portions, the amount of above-mentioned metallic compound to be mixed is at least 1 weight portion and maximum 10 weight portions.When satisfying this condition, transparency is good.
Being used for organic clay of the present invention is imvite or other phyllosilicate (clay), and this imvite or phyllosilicate (clay) are to be inserted with the organic compound intercalation in stacked silicate layer.Usually, between stacked silicate layer, have the interlayer cation such as sodium ion or calcium ion, make to keep the sheet crystal structure.When interlayer cation and organic cation generation ion-exchange, the surface chemistry bonding of organic compound and silicate layer.As a result, described organic compound is inserted in the layer.
Because it is bigger that organic compound is inserted into the distance that makes in the layer between the silicate layer of organic clay.This improvement of terms the dispersiveness of clay in organic substance.The interfloor distance of undressed clay does not change in organic solvent.On the other hand, because organic clay has dilatancy in organic solvent, therefore further increase interfloor distance.This character has further been improved dispersiveness.Above-mentioned organic clay (for example) can be the commercially available clay of selling with trade name Nanofil or S-BEN that gets.
The type that is inserted into the organic compound in the layer comprises quaternary ammonium ion, for example dioctadecyl dimethyl ammonium chloride and two octadecyl benzyl dimethyl ammonium chloride.The organic clay that is inserted with dioctadecyl dimethyl ammonium chloride or two octadecyl benzyl dimethyl ammonium chlorides is to have excellent dispersiveness in the ionomer resin at ethene.This performance has the rigidity of improving the ionomer resin composition and the effect of melting behaviour.
It is desirable to, the content of organic clay is at least 2 weight % and maximum 60 weight % in the ionomer resin composition.If this content is lower than 2 weight %, then improve the deleterious of mechanical performance and melting behaviour.As a result, in extruding operation, be difficult to extrude and be difficult to increase the charging rate of electric wire in the mode that reduces wall thickness.On the other hand, if this content is higher than 60 weight %, though mechanical performance improves, the viscosity of the ionomer resin composition of fusion increases, and makes thus and extrudes poor processability.Better is that the content of organic clay is at least 5 weight % and maximum 40 weight %.
In addition, join in the ionomer resin composition, when using the described composition of ionization radiation exposure then, can improve the thermal endurance of said composition when the alkoxy silane that will have two keys.Though the mechanism that thermal endurance is improved is unclear, following phenomenon may take place.At first, the alkoxy silane part and the basic Cheng Jian of the OH of organic clay that have the alkoxy silane of two keys.As a result, by irradiation, the two keys and the ionomer resin Cheng Jian of organic clay institute bonding.Thus, the apparent degree of cross linking is increased.
Type with alkoxy silane of two keys comprises: for example, and vinyltriethoxysilane, vinyltrimethoxy silane, 3-methacryloxypropyl methyl dimethoxysilane, 3-methacryloxypropyl trimethoxy silane, 3-methacryloxypropyl methyldiethoxysilane, 3-methacryloxypropyl triethoxysilane and 3-acryloxy propyl trimethoxy silicane.It is desirable to 3-methacryloxypropyl trimethoxy silane or 3-methacryloxypropyl triethoxysilane especially.
Can determine to have the addition of the alkoxy silane of two keys as required.But, it is desirable to, with respect to the ionomer resin of per 100 weight portions, the amount of alkoxy silane is at least 0.2 weight portion and maximum 10 weight portions.If this addition is lower than 0.2 weight portion, then this interpolation can not show and improve stable on heating effect significantly.On the other hand, if this addition surpasses 10 weight portions, then organic clay often cohesion easily in the kneading operation process, thus cause outward appearance coarse.
In order to improve the multiple performance such as electric property, mechanical performance and thermal endurance, multiple polymers can be blended in the above-mentioned ionomer resin composition.The type of described polymer comprises:
(a) hydrocarbon polymer, for example polyethylene, polypropylene, polystyrene, Styrene-Butadiene and cyclic polyolefin,
(b) vinyl copolymer, for example ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer and ethylene-methyl methacrylate methyl terpolymer,
(c) polymer that forms by copolymerization such as above-mentioned vinyl copolymer and maleic anhydride, acrylic acid or glycidol ethers,
(d) engineering plastics, for example PETG, polybutylene terephthalate (PBT), nylon 6, nylon 66 and polyphenylene oxide, and
(e) biodegradable polymer, for example polybutylene succinate and poly-lactic acid ester.
Above-mentioned hydrocarbon polymer and vinyl copolymer can with acrylic acid or maleic anhydride generation graft reaction.
Can ionomer resin composition of the present invention can be mixed with polyfunctional monomer (for example trimethylol-propane trimethacrylate or triallyl isocyanurate) or multiple additives (for example antioxidant, fire retardant, ultra-violet absorber, light stabilizer, heat stabilizer, lubricant or colouring agent) as required.Can be with known blender (for example open roll-type blender (open-roll mixer), pressurization kneader, single screw mixer or double-screw mixer) with these material mixing.It is desirable to, adopt melting mixing to operate under the temperature of fusing point that ethene is ionomer resin to carry out above-mentioned mixing being higher than.
Can be by melt extruding machine and described ionomer resin composition is extruded formed internal insulating layer and external insulation with known.Can adopt direct extrusion molding (wherein, described composition directly being extruded on bottom component) or adopt the stretching extrusion molding to extrude the ionomer resin composition.When adopting the stretching extrusion molding, it is desirable to draw ratio (DDR) is set in 1.5 to 200 the scope.If DDR surpasses 200, can take place significantly to shrink in heat treatment operation (for example welding in the operation in the end) time.This contraction is disadvantageous.Calculate DDR with following formula.
DDR＝(D
1 2-D
2 2)/(d
1 2-d
2 2)，
Wherein, D
1: the internal diameter of mould,
D
2: the external diameter of inner core (point),
d
1: the external diameter of coating,
d
2: the internal diameter of coating.
Can also make the internal insulating layer made by the ionomer resin composition and external insulation carry out coming into operation again after crosslinked adopting such as shine such method or employing heat cross-linking method with ionization radiation (comprising accelerated electron beam and gamma-radiation).When resin takes place can strengthen thermal endurance when crosslinked.Thus, can prevent internal insulating layer and external insulation generation fusion when the heat treatment of carrying out such as welding.Consider and boost productivity, it is desirable to by adopting ionization radial line to shine to implement crosslinked.
The type of ionized radiation source comprises (for example) accelerated electron beam, gamma-radiation, X-ray, α-ray and ultraviolet ray.Consider the condition (penetration thickness of for example radiogenic simplicity of operation, ionization radial line and the speed of crosslinking Treatment) of commercial Application, the optimal accelerated electron beam that is to use.Can suitably be identified for producing the accelerating voltage of accelerated electron beam according to the wall thickness of insulating barrier.Yet, it is desirable to, set accelerating voltage so that exposure is at least 80kGy.
When adding has the alkoxy silane with two keys, even when the exposure of ionization radial line is reduced to less value, still can obtain enough degrees of cross linking.In this case, the optimum range of exposure is 20kGy at least.
In internal insulating layer and the external insulation one can make by the insulating material that uses other types.The type of other insulating material comprises: for example, and polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoraoethylene-hexafluoropropylene copolymer (FEP) and ethylene-tetrafluoroethylene copolymer (ETFE).
As required, the inner conductor that uses among the present invention can be selected from (for example) copper cash, copper alloy wire and those are coated with the line of silver etc.Described conductor can be single line or form the twisted wire that electric wire helically twisted constitutes together by many.Form internal insulating layer to cover inner conductor.
Identical with inner conductor, the external conductor that uses among the present invention can be selected from (for example) copper cash, copper alloy wire as required and those are coated with the line of silver, tin etc.By with electric wire with the short as far as possible mode helically twisted of pitch or with the electric wire braiding, thereby external conductor is formed on the internal insulating layer.Form external insulation to cover external conductor.
Multicore coaxial cable of the present invention can form by using many above-mentioned coaxial cords.For example, be banded in together or twist together, when covering the electric wire that gathers together a part of with common shell then, can obtain the structure of multicore when a plurality of coaxial cords.In addition, thus thereby when parallel to each other the arranging of many coaxial cords formed row, when with the part of the common electric wire of shell covering through arranging they being interfixed then, can obtain the multicore coaxial cable of flat.Above-mentioned multicore coaxial cable can connect a large amount of electric wires.Therefore, can adopt the using method identical with flexible flat cable (FFC) to use these multicore coaxial cables with flexible print wiring board (FPC).In this case, many coaxial cords have such structure, and wherein some electric wire interfixes in these electric wires.Therefore, in that part of electric wire that is not fixed, single electric wire can move independently, has increased flexible thus.As a result, multicore coaxial cable of the present invention has than FPC and the more excellent distortion performance of FFC.
Below, by reference embodiment preferred forms of the present invention is described.Should be appreciated that these embodiment do not limit scope of the present invention.
Example
Material formulation example 1 to 3
The preparation of resin composition pellet
Will be such as the material ethene is ionomer resin and organic clay according to the proportioning melting mixing shown in the Table I.(diameter: 26mm L/D=48.5) carries out melting mixing with the twin shaft blender.The temperature of barrel is set at fusing point or the high about 20 ℃ temperature of softening point than described resin.After carrying out melting mixing under the condition that with the screw rod revolution is 200rpm, granulate with granulator.
Table I
| Material formulation example 1 | Material formulation example 2 | Material formulation example 3 | |
| Ionomer resin *1 | 100 | 100 | 100 |
| Organic clay *2 | 10 | 20 |
| Antioxidant *3 | 0.3 | 0.3 | 0.3 |
Annotate:
*1: ethene is ionomer resin: Himilan (registered trade mark) 1706, produced by DuPont-Mitui Polychemicals Co., Ltd; Its modulus of elasticity: 270MPa.
*2: the organic clay (organic compound of insertion usefulness: dioctadecyl dimethyl ammonium chloride; Particle diameter: 25 μ m): Nanofil 15, produced by Sud-Chemie AG company.
*3: antioxidant: Irganox 1010, produced by Ciba Specialty Chemicals company.
Embodiment 1 to 3
Make coaxial cord: the extruding of insulating material
7 copper alloy electric wires that every diameter is 0.016mm are twisted together and make the stranded conductor that diameter is 0.048mm.(diameter: 25mm L/D=24) under the condition shown in the Table II, will be extruded on described conductor by material formulation example 1 or 2 prepared resin combinations, form internal insulating layer with the single shaft extruder.The electric wire that diameter is 0.02mm on internal insulating layer, forms external conductor with the short as far as possible mode helically twisted of pitch.Under the described condition of Table II, will extrude externally on the conductor by material formulation example 1 or 2 prepared resin combinations, form external insulation.So far, obtain single coaxial cord.Shine coaxial cord with electron beam
Adopting accelerating voltage is the electron accelerator of 300kV, is the coaxial cord of the electron beam irradiation embodiment 3 of 200kGy with the exposure, makes internal insulating layer and external insulation generation cross-linking reaction.
The evaluation of coaxial cord: outward appearance
The internal insulating layer shown in the range estimation Table II and the outward appearance of external insulation.When not finding melt fracture, this insulating barrier is judged to be well.
The evaluation of coaxial cord: distortion test
Twist test according to following steps.60 coaxial cords are tied together.The two ends of the electric wire after this is tied up keep and are fixed on the anchor clamps that are used to twist operation.Electric wire after twisting this repeatedly and tie up with 180 ° angles.The number of twists of counting when inner conductor ruptures.After the distortion of having carried out 150,000 times is operated, under the situation that inner conductor does not rupture, this sample is judged to be satisfaction.
The evaluation of coaxial cord: to the patience of sweating heat
The end (approximately 10mm is long) of coaxial electrical line length was flooded for 10 seconds in 250 ℃ solder bath.When because the contraction of external insulation makes that the length of exposure of external conductor is to be less than or equal to 0.5mm and because the contraction of internal insulating layer makes the length of exposure of inner conductor when being less than or equal to 0.5mm, this sample to be judged to be satisfaction.
Above-mentioned evaluation result as shown in Table II.
Table II
Embodiment 1
Use is made internal insulating layer by material formulation example 1 prepared ionomer resin composition.The content of organic clay is 9 weight % in the described resin combination.Can adopt direct extrusion molding is that to form wall thickness under 100 meters/minute the condition be the internal insulating layer of 0.028mm in the electric wire charging rate.Use is made external insulation by material formulation example 2 prepared ionomer resin compositions.The content of organic clay is 16 weight % in the described resin combination.Can adopt direct extrusion molding is that to form wall thickness under 200 meters/minute the condition be the external insulation of 0.023mm in the electric wire charging rate.Confirm thus, can under electric wire charging rate conditions of higher, extrude insulating barrier with the wall thickness that reduces.Test result shows that in the distortion test, the coaxial cord of gained does not demonstrate the inner conductor fracture after twisting 150,000 times, thereby shows to have gratifying result.
Embodiment 2
Use is made internal insulating layer by material formulation example 1 prepared resin combination.Can adopt direct extrusion molding is that to form wall thickness under 150 meters/minute the condition be the insulating barrier of 0.030mm in the electric wire charging rate.Use is made external insulation by material formulation example 1 prepared ionomer resin composition.Can adopt the stretching extrusion molding is that to form wall thickness under 100 meters/minute the condition be the insulating barrier of 0.011mm in the electric wire charging rate.Confirm thus, can under electric wire charging rate conditions of higher, extrude insulating barrier with the wall thickness that reduces.Test result shows that in the distortion test, the coaxial cord of gained does not demonstrate the inner conductor fracture after twisting 150,000 times, thereby shows to have gratifying result.
Embodiment 3
Use is made internal insulating layer by material formulation example 2 prepared resin combinations.Can adopt direct extrusion molding is that to form wall thickness under 200 meters/minute the condition be the insulating barrier of 0.025mm in the electric wire charging rate.Still use by material formulation example 2 prepared resin combinations and make external insulation.Can adopt direct extrusion molding is that to form wall thickness under 100 meters/minute the condition be the insulating barrier of 0.016mm in the electric wire charging rate.Confirm thus, can under electric wire charging rate conditions of higher, extrude insulating barrier with the wall thickness that reduces.In addition, the electron beam of employing 200kGy shines and makes internal insulating layer and external insulation generation cross-linking reaction respectively.The result confirms that the coaxial cord of gained has excellent patience to sweating heat.
Comparative Examples 1
Using the ethene that does not contain organic clay is that ionomer resin composition (referring to material formulation example 3) is made internal insulating layer as composition material.Adopt extruding that direct extrusion molding carries out that wall thickness reduces.But described extruding has such qualification: wall thickness is defined as 0.06mm, and the electric wire charging rate is defined as 70 meters/minute.When the electric wire charging rate increase to surpass that above-mentioned qualification or wall thickness reduce and can not reach above-mentioned qualification the time, described extruding can cause such result: in extrusion, the coarse or material of outward appearance can often occur and supply with the situation of interrupting.Still using the ethene that does not contain organic clay is that ionomer resin composition (referring to material formulation example 3) is made external insulation as composition material.Study with the stretching extrusion molding and to make extruding that wall thickness reduces.Described extruding has such qualification: wall thickness is defined as 0.045mm, and the electric wire charging rate is defined as 40 meters/minute.When setting high DDR and make extruding that wall thickness reduces, insulator breaks, thereby causes being difficult to forming continuously external insulation.
Comparative Examples 2
Use PFA (Neoflon (registered trade mark) PFA AP201 is produced by Daikin Industries Co., Ltd) to make internal insulating layer.Adopt direct extrusion molding to make extruding that wall thickness reduces.But described extruding has such qualification: wall thickness is defined as 0.033mm, and the electric wire charging rate is defined as 100 meters/minute.When the electric wire charging rate increased above above-mentioned qualification, it is coarse that outward appearance begins to become.When making extruding that wall thickness further reduces with 100 meters/minute electric wire charging rate, also can form coarse outward appearance.
Still use the PFA identical to make external insulation with above-mentioned PFA.Study described extruding with the stretching extrusion molding.Described extruding has such qualification: wall thickness is defined as 0.030mm, and the electric wire charging rate is defined as 30 meters/minute.When being when setting high DDR under 30 meters/minute the condition and making extruding that wall thickness reduces in the electric wire charging rate, insulator breaks, thereby causes being difficult to forming continuously external insulation.
Material formulation example 4 to 6
The preparation of resin composition pellet
To carry out melting mixing according to the proportioning shown in the Table III such as the material ethene is ionomer resin, organic clay and the alkoxy silane with two keys.(diameter: 26mm L/D=48.5) carries out melting mixing with the twin shaft blender.Barrel temperature is set at than the fusing point of described resin or the high about 20 ℃ temperature of softening point.Be after carrying out melting mixing under the condition of 200rpm, to granulate at the screw rod revolution with line material cutter (strand-cutting pelletizer).
Table III
| Material formulation example 4 | Material formulation example 5 | Material formulation example 6 | |
| Ionomer resin *1 | 100 | 100 | 100 |
| Organic clay *2 | 20 | 20 | 20 |
| Antioxidant *3 | 0.3 | 0.3 | 0.3 |
| Crosslinking agent *4 | 2 | 2 | |
| Alkoxy silane with two keys *5 | 1 | 1 |
Annotate:
*1 to
*3: referring to the note of Table I.
*4: triallyl isocyanurate.
*The 5:3-methacryloxypropyl trimethoxy silane.
Embodiment 4 to 8
According to the same, under the condition shown in the Table IV, make coaxial cord and carry out various evaluations with embodiment 1 to 3.The gained result as shown in Table IV.
Table IV
Embodiment 4
Use is made internal insulating layer by material formulation example 2 prepared resin combinations.Can adopt direct extrusion molding is that to form wall thickness under 200 meters/minute the condition be the insulating barrier of 0.025mm in the electric wire charging rate.Still use by material formulation example 2 prepared resin combinations and make external insulation.Can adopt the stretching extrusion molding is that to form wall thickness under 150 meters/minute the condition be the insulating barrier of 0.015mm in the electric wire charging rate.Confirm thus, can under electric wire charging rate conditions of higher, extrude insulating barrier with the wall thickness that reduces.In addition, the electron beam of employing 80kGy shines and makes internal insulating layer and external insulation generation cross-linking reaction respectively.The result confirms that the coaxial cord of gained has excellent patience to sweating heat.
Embodiment 5
Use is made internal insulating layer by material formulation example 5 prepared resin combinations.Can adopt direct extrusion molding is that to form wall thickness under 200 meters/minute the condition be the insulating barrier of 0.025mm in the electric wire charging rate.Still use by material formulation example 5 prepared resin combinations and make external insulation.Can adopt the stretching extrusion molding is that to form wall thickness under 150 meters/minute the condition be the insulating barrier of 0.015mm in the electric wire charging rate.Confirm thus, can under electric wire charging rate conditions of higher, extrude insulating barrier with the wall thickness that reduces.In addition, the electron beam of employing 20kGy shines and makes internal insulating layer and external insulation generation cross-linking reaction respectively.The result confirms that the coaxial cord of gained has excellent patience to sweating heat.
Embodiment 6
Use is made internal insulating layer by material formulation example 6 prepared resin combinations.Can adopt direct extrusion molding is that to form wall thickness under 200 meters/minute the condition be the insulating barrier of 0.025mm in the electric wire charging rate.Still use by material formulation example 6 prepared resin combinations and make external insulation.Can adopt the stretching extrusion molding is that to form wall thickness under 150 meters/minute the condition be the insulating barrier of 0.015mm in the electric wire charging rate.Confirm thus, can under electric wire charging rate conditions of higher, extrude insulating barrier with the wall thickness that reduces.In addition, the electron beam of employing 20kGy shines and makes internal insulating layer and external insulation generation cross-linking reaction respectively.The result confirms that the coaxial cord of gained has excellent patience to sweating heat.
Embodiment 7
Use is made internal insulating layer by material formulation example 2 prepared resin combinations.Can adopt direct extrusion molding is that to form wall thickness under 200 meters/minute the condition be the insulating barrier of 0.025mm in the electric wire charging rate.Still use by material formulation example 2 prepared resin combinations and make external insulation.Can adopt the stretching extrusion molding is that to form wall thickness under 150 meters/minute the condition be the insulating barrier of 0.015mm in the electric wire charging rate.Confirm thus, can under electric wire charging rate conditions of higher, extrude insulating barrier with the wall thickness that reduces.In addition, the electron beam of employing 50kGy shines and makes internal insulating layer and external insulation generation cross-linking reaction respectively.Yet, owing to the inner conductor of this sample is exposed after test, so this sample is defective in the patience test to sweating heat.
Embodiment 8
Use is made internal insulating layer by material formulation example 4 prepared resin combinations.Can adopt direct extrusion molding is that to form wall thickness under 200 meters/minute the condition be the insulating barrier of 0.025mm in the electric wire charging rate.Still use by material formulation example 4 prepared resin combinations and make external insulation.Can adopt the stretching extrusion molding is that to form wall thickness under 150 meters/minute the condition be the insulating barrier of 0.015mm in the electric wire charging rate.Confirm thus, can under electric wire charging rate conditions of higher, extrude insulating barrier with the wall thickness that reduces.In addition, the electron beam of employing 30kGy shines and makes internal insulating layer and external insulation generation cross-linking reaction respectively.Yet, owing to the inner conductor of this sample is exposed after test, so this sample is defective in the patience test to sweating heat.
Coaxial cord of the present invention and multicore coaxial cable not only can reduce diameter, and have excellent distortion performance.Therefore, they can be used in the application such as the internal circuit of portable electron device.
Claims (8)
1. coaxial cord, it comprises:
(a) inner conductor;
(b) internal insulating layer of the described inner conductor of covering;
(c) be positioned at the outer external conductor of described internal insulating layer; And
(d) external insulation of the described external conductor of covering;
Wherein, at least one in described internal insulating layer and the described external insulation is to be that the ionomer resin composition of ionomer resin and organic clay is made by containing ethene.
2. as the coaxial cord of claim 1 qualification, wherein said organic clay accounts at least 2 weight % and maximum 60 weight % of described resin combination total amount.
3. the coaxial cord that limits as claim 1 is inserted with in the wherein said organic clay by at least one the organic compound intercalation that constitutes in dioctadecyl dimethyl ammonium chloride and the two octadecyl benzyl dimethyl ammonium chloride.
4. the coaxial cord that limits as claim 1, wherein said ionomer resin composition also contains the alkoxy silane with two keys, wherein the described ethene with respect to per 100 weight portions is ionomer resin, and described amount with alkoxy silane of two keys is at least 0.2 weight portion and maximum 10 weight portions.
5. the coaxial cord that limits as claim 1 wherein makes described ionomer resin composition generation crosslinked by shining with the ionization radioactive ray.
6. as the coaxial cord of claim 1 qualification, the external diameter of wherein said external insulation is 0.22mm to the maximum.
7. method of making coaxial cord, this method may further comprise the steps:
(a) preparation inner conductor;
(b) by being extruded and cover on the described inner conductor, first resin combination forms internal insulating layer;
(c) external conductor is arranged on the periphery of described internal insulating layer; And
(d) by being extruded and cover on the described external conductor, second resin combination forms external insulation;
Wherein, at least one in described first resin combination and described second resin combination is to contain the ionomer resin composition that ethene is ionomer resin and organic clay.
8. multicore coaxial cable, it comprises many as any coaxial cord that is limited in the claim 1 to 6.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-176861 | 2007-07-05 | ||
| JP2007176861 | 2007-07-05 | ||
| JP2007176861 | 2007-07-05 | ||
| JP2008048066 | 2008-02-28 | ||
| JP2008048066A JP4812788B2 (en) | 2007-07-05 | 2008-02-28 | Coaxial wire, method of manufacturing the coaxial wire, and multi-core coaxial cable |
| JP2008-048066 | 2008-02-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101339827A true CN101339827A (en) | 2009-01-07 |
| CN101339827B CN101339827B (en) | 2011-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101278470A Expired - Fee Related CN101339827B (en) | 2007-07-05 | 2008-07-04 | Coaxial cord, manufacturing method thereof, and multi-core coaxial cord |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4812788B2 (en) |
| KR (1) | KR20090004720A (en) |
| CN (1) | CN101339827B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102017018A (en) * | 2009-04-24 | 2011-04-13 | 住友电气工业株式会社 | Electrical wire and method for producing same |
| CN102354548A (en) * | 2011-10-19 | 2012-02-15 | 刘理文 | Highly conductive cable with improved conductor structure and manufacturing method thereof |
| CN104217813A (en) * | 2013-06-04 | 2014-12-17 | 住友电气工业株式会社 | Coaxial electric wire and manufacturing method thereof |
| CN104952522A (en) * | 2014-03-24 | 2015-09-30 | 日立金属株式会社 | Earphone coil and earphone |
| CN108133801A (en) * | 2017-12-15 | 2018-06-08 | 贵阳顺络迅达电子有限公司 | A kind of integrally-formed inductor and preparation method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012146409A (en) * | 2011-01-07 | 2012-08-02 | Sumitomo Electric Ind Ltd | Multicore signal cable and method of manufacturing the same |
| WO2014117809A1 (en) | 2013-01-29 | 2014-08-07 | Abb Research Ltd | New insulation materials for use in high voltage power applications and a new process for preparing said insulation material |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5429487Y2 (en) * | 1972-10-06 | 1979-09-19 | ||
| JP4697361B2 (en) * | 2000-07-24 | 2011-06-08 | Ｊｓｒ株式会社 | Film forming composition and insulating film forming material |
| JP2003132745A (en) * | 2001-10-30 | 2003-05-09 | Nissei Electric Co Ltd | Coaxial cable improved of flexibility |
| JP3960795B2 (en) * | 2001-12-27 | 2007-08-15 | 古河電気工業株式会社 | Insulated wire |
| JP2004083612A (en) * | 2002-08-22 | 2004-03-18 | Furukawa Electric Co Ltd:The | Resin composition and insulated wire |
| JP4461750B2 (en) * | 2003-09-19 | 2010-05-12 | 日立電線株式会社 | Coaxial cable, coaxial cable manufacturing apparatus, and coaxial cable manufacturing method |
| JP2006028420A (en) * | 2004-07-20 | 2006-02-02 | Fujikura Ltd | Non-halogenated flame-retardant polyolefin-based resin composition and flame-retardant insulated electric wire/cable using the same |
| JP2006252937A (en) * | 2005-03-10 | 2006-09-21 | Sumitomo Electric Ind Ltd | Coaxial cable and manufacturing method of same |
| JP4935053B2 (en) * | 2005-11-09 | 2012-05-23 | 住友電気工業株式会社 | Multi-fiber cable connection structure and method for manufacturing multi-fiber cable connection structure |
-
2008
- 2008-02-28 JP JP2008048066A patent/JP4812788B2/en not_active Expired - Fee Related
- 2008-07-03 KR KR1020080064585A patent/KR20090004720A/en not_active Application Discontinuation
- 2008-07-04 CN CN2008101278470A patent/CN101339827B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102017018A (en) * | 2009-04-24 | 2011-04-13 | 住友电气工业株式会社 | Electrical wire and method for producing same |
| CN102354548A (en) * | 2011-10-19 | 2012-02-15 | 刘理文 | Highly conductive cable with improved conductor structure and manufacturing method thereof |
| CN102354548B (en) * | 2011-10-19 | 2014-06-25 | 刘理文 | Highly conductive cable with improved conductor structure and manufacturing method thereof |
| CN104217813A (en) * | 2013-06-04 | 2014-12-17 | 住友电气工业株式会社 | Coaxial electric wire and manufacturing method thereof |
| CN104952522A (en) * | 2014-03-24 | 2015-09-30 | 日立金属株式会社 | Earphone coil and earphone |
| CN104952522B (en) * | 2014-03-24 | 2018-06-01 | 日立金属株式会社 | Earphone cable and earphone |
| CN108133801A (en) * | 2017-12-15 | 2018-06-08 | 贵阳顺络迅达电子有限公司 | A kind of integrally-formed inductor and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4812788B2 (en) | 2011-11-09 |
| CN101339827B (en) | 2011-10-05 |
| KR20090004720A (en) | 2009-01-12 |
| JP2009032662A (en) | 2009-02-12 |
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