CN1255229A - Cable with impact-resistant coating - Google Patents

Cable with impact-resistant coating Download PDF

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Publication number
CN1255229A
CN1255229A CN98804971A CN98804971A CN1255229A CN 1255229 A CN1255229 A CN 1255229A CN 98804971 A CN98804971 A CN 98804971A CN 98804971 A CN98804971 A CN 98804971A CN 1255229 A CN1255229 A CN 1255229A
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Prior art keywords
cable
coating
polymer
copolymer
polymer material
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CN98804971A
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CN1308964C (en
Inventor
S·贝利
L·卡米
A·巴瑞吉
L·巴尔科尼
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Gscp Arsenal (lux) Ii Saar
Price Miln (LUX) II Co.
Pirelli and C SpA
Prysmian Cavi e Sistemi Energia SRL
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Pirelli Cavi SpA
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    • 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
    • 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
    • H01B7/185—Sheaths comprising internal cavities or channels
    • 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
    • H01B7/189—Radial force absorbing layers providing a cushioning effect

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  • Insulated Conductors (AREA)
  • Organic Insulating Materials (AREA)
  • Ropes Or Cables (AREA)
  • Paints Or Removers (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The present invention relates to a coating for cables which is capable of protecting the cable against accidental impacts. By inserting into the structure of a power transmissioncable a suitable coating of expanded polymer material of adequate thickness, preferably in contact with the sheath of outer polymer coating, it is possible to obtain a cable which has a high impact strength. The Applicant has moreover observed that an expanded polymer material used as a coating for cables makes it possible to obtain a higher impact strength for this cable than using a similar coating based on the same polymer which is not expanded. A cable with a coating of this type has various advantages over a conventional cable with metal armor, such as, for example, easier processing, a reduction in the weight and dimensions of the finished cable and a lower environmental impact as regards recycling of the cable once its working cycle is over.

Description

Cable with impact-resistant coating
The present invention relates to the cable coating, this coating can protect cable not to be subjected to accidental shock.
May make the structure of cable a series of damages occur such as the accidental shock that during cable transmission, laying etc., takes place, comprise that insulating barrier distortion, insulating barrier and semiconductor layer separate or the like; This damage may cause the electrical gradient of insulating barrier to change, and the result causes the insulating capacity of this layer to descend.
At the cable that is commercially available at present, for example in transmission of electricity of those low pressure or middle pressure or the cable used of distribution, for the protection cable is avoided the possible damage that accidental shock causes, normally coated metal armor that can anti-this impact.This plate armour can be the form (generally being to make with steel) of band or silk, or with the form of metallic sheath (generally being with lead or aluminium manufacturing); Conversely, the also outer outer layer copolymer sheath that is surrounded by of this plate armour.An example of the cable of this structure has just been described in the US patent 5,153,381.
Observe according to the applicant, the existence of above-mentioned metal armor has a lot of defectives.For example, coated said plate armour will be carried out in one or several additional phase of cable processing.In addition, the existence of metal armor has also increased the weight of cable greatly except that causing environmental problem, change cable if desired, will be difficult for disposing the cable of structure in such a way.
Publication number is a family expenses cable of having described the thick impact-resistant coating of a kind of 0.2-1.4mm of having in the JP patent of 7-320550, and this coating is placed between insulator and the oversheath.This impact-resistant coating is a kind of non-foamable polymer that contains polyurethane resin as major constituent.
On the other hand, be known as various purposes and in the structure of cable, use foamed polymer material.
For example, DE patent application p 15 15 709 discloses outside and has used the intermediate layer between the plastic sheath and interior metallic sheath, so that increase the low temperature resistivity of outer plastic sheath.But do not mention the content of internal structure that has the cable in said intermediate layer about protection in the document.In fact, this intermediate layer should compensate in the outer plastic sheath owing to temperature reduces the elasticity tension that produces, and can be made up of the glass fibre of loose layout, perhaps by can being that the material that foams or mix hollow glass ball is formed.
Disclose a kind of equipment is connected usefulness with machine intimate cable among another piece DE utility model G 81 03 947.6, this cable has special mechanical resistance and flexible.Said cable is for passing through on the pulley and having enough flexible so that custom-designed through replying later its straight structure on said pulley.Therefore, such cable is devoted to the mechanical load (as producing through out-of-date) of anti-static types specially on pulley, and its main characteristics is flexible.Those skilled in the art are easy to find out that such cable and low or middle pressure transmission of electricity or distribution with metal armor have essential distinction with cable, and the latter is not flexible but should resists the dynamic load that some intensity causes the impact of cable.
In addition, in the signal-transmitting cable of coaxial or multiple twin type, be known as and make conductive metal insulation can use expanded material.Coaxial cable normally is used for transporting high-frequency signal, as TV with coaxial cable (CATV) (10-100MHz), satellite cable (the highest 2GHz), computer be with coaxial cable (more than the 1MHz); The black phone cable transports the signal of about 800Hz frequency usually.
Using the purpose of foamed insulation body in this cable is the transfer rate that increases the signal of telecommunication, so that reach the desirable signaling rate (near the light velocity) in the aerial conductive metal.The reason of making is like this, compares with the polymeric material of non-foaming, and expanded material has lower dielectric constant (K) usually, and the foaming degree of polymer is big more, and its dielectric constant is more pro rata near the dielectric constant (K=1) of air.
For example, in the US patent 4,711,811 a kind of signal-transmitting cable has been described, this cable has the fluoropolymer of foaming as insulator (thickness 0.05-0.76mm), and said insulator is surrounded by ethylene/tetrafluoroethylene or ethene/chlorotrifluoroethylene (thickness 0.013-0.254mm) film outward.Described as this patent, the purpose of foamable polymer is to make conductor insulation, the purpose of the non-foamable polymer film of outsourcing foamable polymer is to improve the mechanical performance of insulation, is by give necessary compression strength when two insulated conductors are twisted into what is called " twisted-pair feeder " specifically.
EP patent 442,346 has been described a kind of signal-transmitting cable that has based on the insulating barrier of foamable polymer, said insulating barrier be placed directly in conductor around; The polymer of this foaming has the ultramicropore structure, and its voidage is greater than 75% (being equivalent to the foaming degree greater than 300%).The ultramicropore structure of this polymer should be 6.89 * 10 4Pa load lower compression at least 10% and remove load after can recover at least 50% of initial volume; These numerical value roughly be equivalent to material must have so that the typical compression strength value that compresses during opposing coil buckling cable.
International Patent Application WO 93/15512 has also related to a kind of signal-transmitting cable with foamable polymer insulating barrier, according to statement be by with the insulator of the polymer-coated foaming of insulating layer and thermoplastic of non-foaming (as above-mentioned US4,711, described in 811) obtain required compression strength, however reduced the propagation velocity of signal like this.Said patent application WO93/15512 has described a kind of coaxial cable with double hyer insulation layer, wherein two layers are formed by the polymeric material of foaming, internal layer is made up of expanded microporous polytetra fluoroethylene-EPTEE (PTFE), and skin is made up of closed pore foamable polymer (being perfluoro alkoxy tetrafluoroethene (PFA) polymer specifically).The insulating coating of this foaming polymer base is by the polymer-extruded outside to PTFE insulator internal layer of PFA, injection Freon 113 gas are obtained as blowing agent.According to the detailed description that specification provides, closed pore foamed insulation body makes that keeping high speed to transmit signal becomes possibility.Also clear and definite in this patent application is compression, although do not provide the numerical data of relevant compression strength.Emphasized in the specification can be twisted with the conductor of the external bag of this double hyer insulation, the increase of voidage can cause obtaining the increase of transfer rate in the outer foaming layer, makes the ability of foaming layer in this coating layer resistance compression not have big variation thus.
As what find out from above-mentioned document, using " perforate " foamed polymer material is the transfer rate of the increase signal of telecommunication as signal-transmitting cable with the main purpose of insulating barrier; Yet the defective of these intumescent coatings is to have sufficient inadequately compression strength.The minority expanded material is also by upper being defined as " incompressible ", and this is because they not only guarantee high speed transmission of signals, also is enough to resist the compression stress of the typical generation of institute when two conductors that are coated with above-mentioned foaming insulation layer are twisted together; Thereby equally in this case, the load that applied is a static types basically.
Therefore, on the one hand, these insulating barriers that are used for signal-transmitting cable by the foamed polymer material manufacturing must have they can bear relative moderate compression load (for example producing) when two cables are twisted together feature, on the other hand, all do not mention the shock strength that any kind can be provided by the foamable polymer coating in any document that just applicant knows.In addition, though this foamed insulation coating has promoted the signal transmission of fair speed, as what think among the above-mentioned patent application WO93/15512, aspect compression strength, not as favourable by the coating of similar non-foam material manufacturing.
According to the present discovery of applicant; by in the structure of power transmission cable, inserting suitable coating by the foamed polymer material manufacturing with suitable thickness and bending modulus; preferably contact with the sheath of outer polymer coating; the cable of high impact strength can be obtained to have, above-mentioned sacrificial metal plate armour can be avoided in this construction of cable, using thus.Specifically, the applicant notice should the selective polymer material so that it has sufficiently high bending modulus (mensuration before its foaming), thereby reach desired impact resistance, and avoid the possible damage of the cable internal structure that causes owing to the impact of not expecting its outer surface.In this specification, term " impact " is meant and comprises all dynamic loads that can have certain energy of the effect of can ignoring to armoring substantive damage of construction of cable generation of routine to the conventional armoring construction of cable.As a kind of explanation, this impact can be considered to the impact of about 20-30 joule of producing by V-type circular edges stamping machine (the about 1mm of its radius of curvature) on cable jacket.
The applicant also notices amazedly, and the coating that the polymeric material of foaming is used as cable of the present invention is used, and the shock strength that is obtained is better than use based on the similar coatings of the same polymer of foaming not.
Cable with this types of coatings is better than the various advantages that routine has the metal armor cable, in case for example the environmental impact that more easily weight of processing, final finished cable reduces with size and the work period finishes relevant cable recirculation reduces.
One aspect of the invention relates to a kind of power transmission cable, and this cable comprises:
A) conductor;
B) the fine and close insulating coating of one deck at least;
C) one deck is by the coating of foamed polymer material manufacturing, and wherein said polymeric material has predetermined mechanical strength property and predetermined foaming degree, so that shock-resistant characteristic is provided for said cable.
According to a preferred aspect of the present invention, foamed polymer material is to be obtained according to the polymeric material that ASTM standard D790 is determined as greater than 200MPa, preferred 400MPa-1500MPa, preferred especially 600MPa-1300MPa by the bending modulus under its room temperature before the foaming.
According to a preferred aspect of the present invention, the foaming degree of said polymeric material is about 3000% for about 20%-, preferably about 30%-is about 500%, especially preferably foaming degree is about 50%-about 200%.
According to the preferred embodiments of the invention, the thickness of foamed polymer material coating is 0.5mm at least, preferred 1-6mm, particularly 2-4mm.The preferred aspect according to the present invention, foamed polymer material are selected from polyethylene (PE), low density PE (LDPE), middle density PE (MDPE), high density PE (HDPE) and linear, low density PE (LLDPE); Polypropylene (PP); Ethylene propylene rubber (EPR), ethylene propylene copolymer (EPM), ethylene propylene diene terpolymers (EPDM); Natural rubber; Butyl rubber; Ethylene/vinyl acetate (EVA) copolymer; Polystyrene; Ethene/acrylic ester copolymer, ethylene/methyl acrylate (EMA) copolymer, ethylene/ethyl acrylate (EEA) copolymer, ethylene/butyl acrylate (EBA) copolymer; Ethylene/alpha-olefin copolymer; Acronitrile-butadiene-styrene (ABS) resin; Halogen polymer, polyvinyl chloride (PVC); Polyurethane; Polyamide; Aromatic polyester, polyethylene terephthalate (PET), polybutylene terephthalate (PBT); With and copolymer or mechanical impurity.
According to another preferred aspect, polymeric material is based on polyolefin polymer or the copolymer of PE and/or PP, preferably uses the ethylene propylene rubber modification, and wherein the PP/EPR weight ratio is 90/10-50/50, preferred 85/15-60/40, particularly about 70/30.
According to another preferred aspect,, be preferably the 10-60wt% of polymer based on the vulcanized rubber that contains the powder type of scheduled volume in the polyolefin polymer of PE and/or PP or the copolymer.
According to another preferred aspect, also comprise outer polymer jacket in the cable, this sheath preferably contacts with the foamable polymer coating, and the thickness of preferred sheath is 0.5mm at least, preferred 1-5mm.
Another aspect of the present invention relates to provide the method for shock strength to cable, and this method comprises uses the said cable of being made by foamed polymer material of applying coating.
According to preferred aspect, provide the method for shock strength also to comprise to cable and apply said intumescent coating with outer protectiveness sheath.
Another aspect of the present invention relates to foamed polymer material in the purposes that provides for power transmission cable in the shock strength.
Another aspect of the present invention relates to comprise the evaluation method of shock strength of the cable of at least one layer insulating, and this method is made up of following steps:
A) the average peel strength of the said insulating barrier of mensuration;
B) allow cable be subjected to the impact of predetermined power;
C) measure the peel strength of said insulating barrier at the shock point place;
D) check that the difference of average peel strength and the peel strength of measuring at the shock point place is less than the predetermined value of said cable with respect to average peel strength.
According to preferred aspect, peel strength is measured between insulating coating and outer coated semiconductor.
Among the present invention, the foaming degree of term " polymer " " be interpreted as being meant the foam degrees of the polymer that records according to following formula:
G (foaming degree)=(d 0/ d e-1) 100
D wherein 0The density of representing non-foamable polymer (being meant that promptly its structure does not have the polymer of voidage basically), d eBe meant the apparent density of the foamable polymer of mensuration.
Among the present invention, term " foaming " polymer is interpreted as being meant that voidage in its structure (promptly being meant the space that is not aggregated that thing occupies but is occupied by gas or air) percentage is generally greater than the polymer of 10% total polymer volume.
Among the present invention, term " is peeled off " intensity and is interpreted as being meant that the one deck with coating separates (peeling off) needed power with another layer of conductor layer or coating; In the situation that two layers of coating are separated from one another, these two layers are generally insulating barrier and outer semiconductor layer.
In general, the dielectric constant of power transmission cable insulating barrier (K) is greater than 2.In addition, the signal-transmitting cable of negative any importance is different with " electrical gradient " parameter wherein, has used in the power transmission cable the about 0.5KV/mm of low pressure up to the electrical gradient to the about 10KV/mm scope of high pressure; Therefore, in these cables, tend to avoid that heterogeneity is arranged in the insulating coating existence of (for example voidage), polyphasic existence can cause the localized variation of dielectric strength, and the result has reduced insulating capacity.Thereby this insulating material generally is the densified polymer material, wherein, and in the present invention.Term " densification " insulator be interpreted as being meant its dielectric strength centering-high voltage power transmission cable for 5KV/mm at least, be preferably greater than 10KV/mm, particularly greater than the insulating material of 40KV/mm.Different with foamed polymer material, there is not voidage in the structure of this dense material basically; Specifically, the density of this material is 0.85g/cm 3Or it is higher.
Among the present invention, term " low pressure " is interpreted as being meant the voltage that is up to 1000V (normally greater than 100V), and term " middle pressure " is interpreted as being meant the voltage of the about 30KV of about 1-, and term " high pressure " is meant the voltage greater than 30KV.This power transmission cable generally 50 or the nominal frequency of 60Hz under work.
Though the use to the foamable polymer coating in the description process is to be with reference to having done detailed illustrating with the power transmission cable; wherein this coating can advantageously replace the metal armor that uses at present in this cable; yet those skilled in the art know that this intumescent coating can be advantageously used in the cable of any kind, thereby suitable impact resistance protection is provided desirably for this cable.Specifically, the definition of power transmission cable not only comprises the type that is specifically designed to low-voltage and medium voltage, also comprises the cable that is used for high voltage power transmission.
Following accompanying drawing will help further to understand the present invention:
Fig. 1 has shown the existing power transmission cable with three utmost point types of metal armor in a kind of this area.
Fig. 2 has shown first embodiment of the present invention, is a kind of cable of three utmost point types.
Fig. 3 has shown second kind of embodiment of the present invention, is a kind of cable of monopolar type.
Fig. 1 is the cross-sectional view of the middle pressure power transmission cable of prior art, is a kind of cable with three utmost point types of metal armor.This cable comprises three conductors (1), all outer respectively interior coated semiconductor (2), insulating barrier (3), outer semiconductor layer (4) and the metal screen layer (5) of being surrounded by; For the sake of simplicity, this specification with the lower part in be " core " with this finished semiconductor organization definition.These three cores are tied together, and the star area of space between them is filled packing material (9) (normally elastomer blends, polypropylene fibre or the like), so that make the structure of cross section become circle, and whole coated with interpolymer sheath (8), metal wire plate armour (7) and outer polymer jacket (6).
Fig. 2 is the cross-sectional view of cable of the present invention, also is a kind of middle three utmost point types of pressing transmission of electricity usefulness.This cable comprises three conductors (1), all outer respectively interior coated semiconductor (2), insulating barrier (3), outer semiconductor layer (4) and the metal screen layer (5) of being surrounded by; At this moment, fill with impact-resistant foamed polymer material (10) in the star space between the core, and said foamed polymer material (10) uses outer polymer jacket (6) coated conversely.In foamable polymer coating (10), also demonstrate a circular edges (10a) (by a chain-dotted line) that is equivalent to foamable polymer coating minimum thickness, near the outer surface of core.
Fig. 3 is the cross-sectional view of cable of the present invention, and it is a kind of middle monopolar type of pressing transmission of electricity usefulness.This cable comprises central conductor (1), is surrounded by interior coated semiconductor (2), insulating barrier (3), outer semiconductor layer (4), metal screen layer (5), foamed polymer material layer (10) and outer polymer jacket (6) outward.In one pole cable shown in Figure 3,, coincide at the layer (10) of the circular edges (10a) shown in three utmost point cables with foamed polymer material because core has circular cross section.
These figure have only represented several possible embodiment of cable apparently, and wherein the present invention can advantageously be utilized.Obviously can make suitable improvement known in the art to these embodiments, and the restriction of unmatchful range of application of the present invention.For example, with reference to figure 2, star region between core can be loaded conventional packing material in advance, obtain semi-finished cable, its cross section roughly is equivalent to be included in the circular cross section in the circular edges (10a), then can be advantageously on the transverse cross-sectional area of this false add worker cable extrusion foaming polymeric material (10) layer, its thickness roughly corresponds to circular edges (10a), next extrudes oversheath (6).Perhaps, can assemble a cross section segment,, not use packing material and be not required to be the star area of space when these cores combine, to form the mode of circular cross section cable to core; Extruding the layer of shock resistance foamed polymer material (10) then on the core that these combine like this, then is oversheath (6).
Concerning the cable that low voltage power transmission is used, the structure of cable only comprises the insulating coating that directly contacts with conductor usually, is coated with the coating and the oversheath of foamed polymer material on this insulating coating conversely.
Other solution form is known to those skilled in the art, and said those skilled in the art can be based on the settling mode of passing judgment on out most convenient such as type of expense, erecting cable (in aerial, the insertion tube, directly imbed in underground, the building, seabed etc.), cable working temperature (the highest and minimum temperature, ambient temperature range) or the like.
But shock-resistant foamable polymer coating can be made up of the foamable polymer of any kind, as polyolefin, polyolefin copolymer, alkene/ester copolymer, polyester, Merlon, polysulfones, phenolic resins, Lauxite and composition thereof.The example of suitable polymer blend is polyethylene (PE), low density PE (LDPE), middle density PE (MDPE), high density PE (HDPE) and linear, low density PE (LLDPE); Polypropylene (PP); Ethylene propylene rubber (EPR), particularly ethylene propylene copolymer (EPM) or ethylene propylene diene terpolymers (EPDM); Natural rubber; Butyl rubber; Ethylene/vinyl acetate (EVA) copolymer; Polystyrene; Ethene/acrylic ester copolymer, particularly ethylene/methyl acrylate (EMA) copolymer, ethylene/ethyl acrylate (EEA) copolymer, ethylene/butyl acrylate (EBA) copolymer; Ethylene/alpha-olefin copolymer; Acronitrile-butadiene-styrene (ABS) resin; Halogen polymer, particularly polyvinyl chloride (PVC); Polyurethane (PUR); Polyamide; Aromatic polyester, as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT); With and copolymer or mechanical impurity.Preferred polyolefin polymer or the copolymer of using is particularly based on those of PE that mixes with ethylene propylene rubber and/or PP.Advantageously, can use the polypropylene of ethylene propylene rubber (EPR) modification, the PP/EPR weight ratio is 90/10-50/50, preferred 85/15-60/40, preferred about 70/30 weight ratio especially.
According to other aspects of the invention, the applicant also observes the rubber manufacturing machinery mixing of the powder type of the polymeric material (particularly olefin polymer, especially polyethylene or polypropylene) that can handle through foaming and scheduled volume, for example Liu Hua natural rubber.
In general, powder can be 10-1000 μ m by granularity, preferably the particle of 300-600 μ m forms.Advantageously, can use from the vulcanized rubber waste material in the tire processing.The percentage of powder type rubber can be 10-60wt% with respect to polymer to be foamed, preferred 30-50wt%.
No matter polymeric material to be foamed (is to use without further processing; still with the mixture of powdered rubber in use as the base-material that can foam) should have certain rigidity; so that when it is foamed, can guarantee required resistance to impact to a certain degree, thereby the damage of contingent accidental shock is subsequently avoided in the inside (promptly being meant the insulator layer and the semiconductor layer that may exist) of protection cable.Specifically, material should have sufficiently high ability and absorb impact energy, so that certain quantity of energy is transferred to following insulating barrier, consequently the insulation characterisitic of finishing coat is not modified above predetermined value down.Its reason, illustrated as following more detailed description, be observation according to the applicant, in the cable that is impacted, below can be observed between the mean value of peel strength of insulating coating and the value that the shock point place measures variant; Advantageously, between insulating barrier and outer semiconductor skin, measure peel strength.The impact energy that is transferred to down surface layer is big more, and the difference of this intensity is big more; Wherein peel strength is measured between insulating barrier and outer semiconductor layer, according to judge when the peel strength at shock point place with respect to the difference of mean value less than 25% the time, protective finish can be internal layer enough protections is provided.
The applicant finds that be selected from above-mentioned polymeric material is particularly suitable for this purpose, bending modulus being determined as greater than 200MPa, preferred 400MPa at least according to ASTM standard D790 under the room temperature of said material before foaming.On the other hand, because the excessive rigidity of expanded material can make the finished product unhandy, the therefore preferred polymeric material that uses the room temperature bending modulus less than 2000MPa.The polymeric material that is particularly suitable for this purpose is that bending modulus is the material of 400-1800MPa under the preceding room temperature of foaming, and bending modulus is the polymeric material of 600-1500Mpa under the preferred especially room temperature.
These flexural modulus values can be the features of certain material, perhaps can derive from the material mixing that two or more is had different modulus, and the ratio of mixing is for can obtain the required rigidity value of material.For example, for reaching, bending modulus can be done suitable modification greater than the polypropylene of 1500MPa with the ethylene propylene rubber (EPR) of about 100MPa modulus of Sq to be fit to the purpose that mode reduces rigidity.
The examples of compounds of the polymer that is commercially available is: low density polyethylene (LDPE): Riblene FL 30 (Enichem); High density polyethylene (HDPE): DGDK 3364 (Union Carbide); Polypropylene: PF 814 (Montell); Polypropylene with the EPR modification: Moplen EP-S 30R, 33R and 81R (Montell); Fina-Pro 5660G, 4660G, 2660S and 3660S (Fina-Pro).
The foaming degree of polymer and the thickness of coating should be cause they can guarantee and outer polymer jacket resist together cable operated and the laying during contingent typical impact.
As previously mentioned, " foaming degree of polymer " records according to following formula:
G (foaming degree)=(d 0/ d e-1) 100
D wherein 0The density of representing non-foamable polymer, d eBe meant the apparent density of the foamable polymer of mensuration.
The applicant finds, concerning the foaming layer of equal thickness, in keeping the scope that required resistance to impact allowed, preferably use the high polymeric material of foaming degree, this is because consumption that like this can limit polymerization thing material, all is favourable to the saving and the weight reduction of finished product.
Foaming degree is extremely variable, and the function that is used particular polymers material is again the function of desire with coating layer thickness; As a rule, foaming degree can be 20%-3000%, preferred 30%-500%, the foaming degree of preferred especially 50%-200%.Foamable polymer has hole-closing structure usually.
Observe according to the applicant, surpass foaming to a certain degree, polymer coating provides the ability of required shock strength to descend.Specifically, the possibility of the high foaming degree polymer of the efficient protection impact of acquisition maintenance is relevant with the flexural modulus values for the treatment of foamable polymer according to observations.It is that the modulus of polymeric material reduces with the increase of this material foaming degree that its reason is observed according to the applicant, roughly is equivalent to following formula: E 2/ E 1=(ρ 2/ ρ 1) 2Wherein: E 2The bending modulus of representing the polymer of higher foaming degree; E 1The bending modulus of the polymer of the low foaming degree of expression; ρ 2The apparent density of representing the polymer of higher foaming degree; ρ 1The apparent density of the polymer of the low foaming degree of expression;
As guidance, concerning the polymer with about 1000MPa bending modulus, the variation of 25%-100% foaming degree roughly needs the flexural modulus values of material to reduce by half.Therefore, the higher polymeric material of bending modulus can be foamed into bigger degree by the polymeric material lower than flexural modulus values, and does not damage the impact-resistant ability of coating.
Another variable factor that influences the cable shock strength easily is the thickness of intumescent coating; Can guarantee to depend on the foaming degree and the bending modulus of this polymer with the minimum thickness that this coating obtains desired shock strength.As a rule, according to applicant's observation,, can reach the shock strength of high value by the thickness that increases intumescent coating to identical polymer and identical foaming degree.Yet, reducing the purpose of finished product expense and size using the finite quantity coating material, the thickness of foamed material layer is to guarantee that the needed minimum thickness of required shock strength is favourable.Specifically, centering is pressed the cable of type, and thickness can guarantee to be enough to resist the normal impact that this type cable is subjected to usually for the intumescent coating of about 2mm according to observations.Preferably, coating layer thickness is greater than 0.5mm, specifically is the about 6mm of about 1mm-, preferred especially 2mm-4mm.
The applicant has found rationally to define approx the material with various flexural modulus values the relation between coating layer thickness and the polymeric material foaming degree, thereby the thickness of intumescent coating can be made size aptly as the function of foaming degree and polymeric material modulus, particularly to the thickness of about 2-4mm intumescent coating.
This relation can be expressed by following formula: Vd e〉=N wherein V represents the volume (m of the foamed polymer material of every running meter cable 3/ m), said volume has relation with circular edges by intumescent coating minimum thickness definition, is equivalent to the coating (10) that defines in the circular edges (10a) of Fig. 2 multipolar cable or Fig. 3 one pole cable.De represents the apparent density (kg/m of foamed polymer material 3); N represents the long-pending result of above-mentioned two numerical value, and it should be greater than or equal to: 0.03, concerning the material of modulus＞1000Mpa; 0.04, concerning modulus is the material of 800-1000Mpa; 0.05, concerning modulus is the material of 400-800Mpa; 0.06, concerning modulus be＜material of 400Mpa.
V parameter is relevant with intumescent coating thickness (S) by following relation: V=π (2R iS+S 2) R wherein iThe inside radius of expression circular edges (10a).
Parameter d eRelevant by aforementioned relation with the foaming degree of polymeric material:
G＝(d 0/d e-1)·100
Based on above-mentioned relation, it is found that concerning various materials with different room temperature bending moduluses (Mf), place the intumescent coating of about 2mm thickness on the circular portion of the cable of the about 22mm of diameter, this coating should have the minimum apparent density of about following numerical value: 0.40g/cm 3, concerning LDPE (Mf about 200); 0.33g/cm 3, concerning 70/30 PP/EPR mixture (Mf about 800); 0.26g/cm 3, concerning HDPE (Mf about 1000); 0.20g/cm 3, concerning PP (Mf about 1500).
These foamable polymer apparent density values are equivalent to the maximum foaming degree of following numerical value approximately: 130%, and (d concerning LDPE 0=0.923); 180%, (d concerning the PP/EPR mixture 0=0.890); 260%, (d concerning HDPE 0=0.945); 350%, (d concerning PP 0=0.900).
Equally, on same size cable, place the intumescent coating of about 3mm thickness, obtain following minimum apparent density: 0.25g/cm 3, concerning LDPE; 0.21g/cm 3, concerning the PP/EPR mixture; 0.17g/cm 3, concerning HDPE; 0.13g/cm 3, concerning PP; Be equivalent to the maximum foaming degree of following numerical value approximately: 270%, concerning LDPE; 320%, concerning the PP/EPR mixture; 460%, concerning HDPE; 600%, concerning PP.
The shock strength characteristic that The above results is illustrated as the intumescent coating that makes predetermined thickness reaches best, just should consider the mechanical strength property (particularly its bending modulus) of material and the foaming degree of said material simultaneously.Yet the numerical value that records by the application above-mentioned relation not will be understood that it is to limit scope of the present invention.Specifically, the maximum foaming degree of polymer, said polymer have the flexural modulus values (be meant 400,800 and 1000MPa) of the spacing value upper limit when changing near definition number N, in fact even may be greater than the value of calculating according to above-mentioned relation; Therefore, such as the required surge protection effect that PP/EPR layer (the about 800MPa of Mf) still might provide even foaming degree about 200% is had of the about 2mm of a thickness.
Polymer normally foams in extrusion; This foaming both can be that suitable by adding " foaming " compound (promptly can produce the compound of gas under set point of temperature and pressure condition) takes place with chemical mode, also can be by taking place with physics mode being injected directly in the extruder barrel under the gas high pressure.
The suitable example of chemistry " blowing agent " is the mixture of Celogen Az, organic acid (as citric acid) and carbonate and/or bicarbonate (as sodium acid carbonate).
High-pressure injection is nitrogen, carbon dioxide, air and low boiling hydrocarbon such as propane and butane to the example of the gas that extruder barrel is used.
The protectiveness oversheath of outsourcing foamable polymer layer can be the type of common use easily.The material that available external coating is used is polyethylene (PE), particularly middle density PE (MDPE) and high density PE (HDPE), polyvinyl chloride (PVC), elastomeric mixture etc.MDPE or PVC are preferred the uses.In general, the bending modulus that forms the polymeric material that this oversheath uses is the about 1200MPa of about 400-, the about 1000MPa of preferably about 600-.
The applicant finds that having of oversheath helps together offer the required shock strength characteristic of coating with intumescent coating.Especially observe according to the applicant, concerning the intumescent coating of same thickness, this sheath is to increase with the increase of the foaming degree of polymer along with forming intumescent coating to the contribution of anti-impact intensity.The thickness of oversheath is preferably more than 0.5mm, specifically is 1-5mm, preferred 2-4mm.
The present invention has the preparation of the cable of shock strength and will describe by the construction of cable figure with reference to figure 2, but the not direct filling-foam polymer (10) in the star space between the core wherein to be applied, and fill with conventional fillers; Then foamed coating is expressed on this semi-finished cable, forms circular edges (10a) around this false add worker cable, and the outer polymer jacket (2) of outsourcing next.The preparation of cable core, promptly the assembling of conductor (4), inner semiconductor layer (9), insulator (5), outer semiconductor layer (8) and metal screen layer (4) is finished by methods known in the art, for example passes through extrusion way.Then these cores are tied together, and, generally be to adopt filler is extruded on the quilt core of tying, thereby obtain the false add worker cable of circular cross section with conventional packing material (as elastomer blends, polypropylene fibre or the like).Afterwards foamable polymer coating (10) is expressed on the packing material.Preferably, the diameter of extruder head mould is slightly less than the final diameter of the cable with intumescent coating, so that allow polymer in the foaming of extruder outside.
According to observations, under identical extrusion condition (as the rotary speed of screw rod, the speed of extruding production line, diameter of extruder head or the like), extrusion temperature is a state-variable that foaming degree is had significantly affecting.As a rule, to the extrusion temperature below 160 ℃, it is difficult obtaining enough foaming degrees; Preferably at least 180 ℃ of extrusion temperatures, particularly about 200 ℃.Usually, the corresponding higher foaming degree of the increase of extrusion temperature.
In addition, can control the foaming degree of polymer to a certain extent by acting on cooldown rate, because, can increase or reduce the foaming degree of the said polymer by suitably slowing down or quickening cooling (if the polymer that the formation intumescent coating is used is at outlet of extruder).
Find that as the applicant peel strength by measuring cable coating, this peel strength mean value and estimating poor between the shock point place measured value can quantitative assay go out the impact effect to cable coating.Specifically, concerning having the medium-pressure type cable that comprises inner semiconductor layer, insulating barrier and outer semiconductor layer structure, it is favourable measuring peel strength (reaching be correlated with poor) outside between semiconductor material layer and the insulating barrier.
Observe according to the applicant, the impact effect of the especially severe that cable may be subjected to, Zhuan Jia midium voltage cable particularly, can reproduce by mode based on the shock test of French standard HN33-S-52, said French standard HN33-S-52 relates to the high voltage power transmission armored cable, and it allows the cable impact energy of about 72 joules (J).
The peel strength of coating can be measured according to French standard HN33-S-52, is to measure outer semiconductor layer is separated the required power that applies with insulating barrier according to this standard.The applicant finds, by impacting the said power of origination point place's METHOD FOR CONTINUOUS DETERMINATION, can record expression two-layer between the peak value of the power that changes of bonding force.According to observations, these change general related the decline of coating insulation ability.The shock strength that outer cover (in the present invention, outer cover is made up of intumescent coating and oversheath) provides is more little, and variation will be big more pro rata.Therefore, the variation size of the power of measuring at the shock point place (with respect to the mean value of measuring along the cable) degree of protection of having indicated protective finish to provide.In general, be up to 20-25% with respect to the variation of mean value peel strength and be considered to acceptable.
Can suitably select the characteristic (material, foaming degree, thickness) of intumescent coating according to the surge protection of desiring to offer the following construction of cable; wherein to use together be favourable for intumescent coating and the suitable outer polymer jacket of protectiveness; can also be according to the characteristic as insulator and/or semi-conductive certain material, for example hardness of material, density or the like.
As what can understand from the present invention describes, cable of the present invention has the armored cable that favourable characteristic is particularly suitable for replacing routine because the foamable polymer coating is compared metal armor.Yet its use should not be limited in the special application.In fact, cable of the present invention has at all expectation cables that utilization all is favourable in the purposes that strengthens erosion-resisting characteristics.Specifically, use until now armored cable with purposes favourable but that hindered because of the metal armor defectiveness in, shock-resistant cable of the present invention can replace the not armored cable of the routine in these all purposes.
For the present invention is described in further detail, below provide the embodiment of some illustrative.Embodiment 1
Preparation has the cable of intumescent coating
For estimating the shock strength of foamable polymer coating of the present invention, prepare various test appliances, the preparation method is by extrude several polymer with various foaming degrees of different-thickness on core, wherein said core is formed by being coated with the thick multi-thread conductor of about 14mm that 0.5mm semiconductor material layer, 3mm compound layer (this material is based on EPR) and 0.5mm " easily strip off " semiconductor material layer (this material is based on the EVA that strengthens with carbon black), makes total core thickness reach about 22mm.
Use the 70/30 weight ratio mechanical impurity (PE-powder) of low density polyethylene (LDPE) (LDPE), high density polyethylene (HDPE) (HDPE), polypropylene (PP), LDPE and fine-powdered sulfurized natural rubber (granularity 300-600 μ m), PP (PP-ERP of 70/30 weight ratio mixture) the conduct polymeric material to be foamed of ERP modified rubber; These materials are discerned with alphabetical A to E in following content, and are described in detail in following table:
Material Brand and manufacturer Modulus (MPa)
A B C D E LDPE HDPE PP PP-EPR PE/ powder Riblene?FL?30-Enichem DGDK?3364-Union?Carbide PF?814-Montell FINA-PRO?3660S Riblene?FL?30 260 1000 1600 1250
Polymer is carried out the chemical method foaming, perhaps uses two kinds of different foaming compounds (CE), following explanation:
Compound Brand and manufacturer
CE1 Celogen Az Sarmapor?PO-Sarma
CE2 Carboxylic acid-bicarbonate Hydrocerol?CF?70-Boehringer Ingelheim
Polymer to be foamed and foaming compound are loaded in (used ratio sees Table 2) 80mm-25D single screw extrusion machine (Bandera); This extruder is equipped with and is characterised in that the final district degree of depth is the screw thread transmission screw rod of 9.6mm.Extrusion system is made up of formpiston that smooth extrusion core to be applied can be provided (its diameter is generally than the about 0.5mm of the diameter of core to be applied) and former (its diameter is selected to so that it is big or small than the little about 2mm of the cable size with intumescent coating); In this way, the material of extruding is in the foaming of the exit of extruder head, rather than in the inside of head or the inside of extruder.It is the function (referring to table 2) of expanded material desired thickness that the extruded velocity (extruding production line speed) of core to be applied is set for.In the distance from the about 500mm of extruder head is cooling water pipe (containing cooling water), so that foaming is stopped and making extruded material cooling.Then cable is entangled on the bobbin.
The composition of polymeric material/blowing agent blends and extrusion condition (speed, temperature) can suitably change, and be as shown in table 2 below.Table 2: foaming mixture and extrusion condition
Cable number Material+% and blowing agent type Extruder speed (1)Extruder temperature production linear speed (change/min) (℃) degree (m/min)
1 2 3 4 5 6 7 8 9 10 11 A+2％CE1 A+2％CE1 A+2％CE1 A+2％CE1 A+2％CE1 A+0.8％CE2 C+0.8％CE2 C+0.8％CE2 E+0.8％CE2 B+1.2％CE2 D+2％CE2 6.4???????165??????????3 11.8??????190-180??????2 5.5???????190-180??????3 6.8???????190-180??????2 6.4???????165??????????1.5 5.7???????225-200??????2 3.7???????200??????????2 6.3???????200??????????2 4.9???????225-200??????1.8 8.2???????225-200??????2 8?????????225-200??????2
(1): extruder temperature is with respect to machine barrel and extruder head.When only providing a numerical value, these temperature are identical.At the original area of extruder, about 150 ℃ of temperature.
Sample 1 does not experience foaming, and the chances are because the temperature too low (165 ℃) of extruder, the limited foaming of sample 5 experience by the same token (only 5%).
Next give the conventional MDPE sheath (CE90-Materie PlasticheBresciane) of (referring to table 3) of cable coating different-thickness by conventional extrusion method, obtain to have the cable sample of table 3 defined feature with intumescent coating; Wherein polymer No. 1 cable not experiencing foaming is taken as the non-foamable polymer coating of comparative.Be the contrast purpose, table 3 gives the characteristic (No. 0 cable) that lacks foaming fillers and only use the coated cable of oversheath.Table 3: coating characteristic
Cable number The foaming degree of filler (%) depth of packing (mm) jacket thickness (mm)
0 1 2 3 4 5 6 7 8 9 10 11 -???????????????????0???????????????3 0???????????????????1???????????????3 31??????????????????4.3?????????????3 61??????????????????1???????????????3 48??????????????????2.5?????????????3 5???????????????????3???????????????3 35??????????????????2???????????????2 52??????????????????2???????????????2 29??????????????????3???????????????2.2 23??????????????????2.5?????????????2 78??????????????????4???????????????2 82??????????????????4???????????????2
In the same manner described above, use bending modulus for about 600MPa by the foamable polymer coating of forming with the polypropylene of about 30%ERP modified rubber, prepare 6 kinds of cable samples of another batch, see Table 4 (example 12-17); Table 4 gives the comparative example of two cables, and wherein cable has intumescent coating but lacks oversheath (example 16a and 17a).Table 4: coating characteristic:
Cable number The foaming degree of filler (%) depth of packing (mm) jacket thickness (mm)
12 13 14 15 16 16a 17 17a 71??????????????????3???????????????1.9 22??????????????????2???????????????2 167?????????????????3???????????????1.8 124?????????????????2???????????????2 56??????????????????2???????????????2 56??????????????????2???????????????- 84??????????????????2???????????????2 84??????????????????2???????????????-
Embodiment 2
The shock strength test
For the shock strength of evaluate root, cable is carried out shock test then estimate damaged condition according to the cable of embodiment 1 preparation.Simultaneously by estimating impact effect to the mode of cable naked eyes analysis with by the mode of measuring the semiconductor material layer peel strength variation of shock point place.Shock test is based on French standard HN33-S-52, and this standard is that the cable impact energy for about 72 joules (J) provides, and said 72 joules of impact energys are that the weight by 27kg obtains from the high falling of 27cm.Concerning this test, this impact energy is produced from the 97cm high falling by the 8kg weight.The impact end of weight is equipped with circular edges (1mm radius of curvature) cutting head of V-type.In purpose of the present invention, the shock strength that one-shot hits is estimated.To sample 6-12, from the distance repetition test for the second time of about 100mm for the first time.
Measure peel strength according to French standard HN 33-S-52, outer semiconductor layer is separated the required power that applies with insulating barrier according to this standard test.By the said power of METHOD FOR CONTINUOUS DETERMINATION, record the peak value of power at the some place that takes place to impact.Concerning each test block,, record " just " power peak value (being equivalent to the increase (mean value relatively) of the needed power of separates two) and " bearing " power peak value (relative mean value descends) at the shock point place.From the maximum (Fmax) and the difference between minimum (Fmin) value of the power peak value that records, the maximum changing value of acquisition shock point place peel strength.
According to following relation, by measure above-mentioned poor (Fmax-Fmin) and the average peel strength value of the cable of surveying (F＜〉) between percentage calculate the rate of change of peel strength:
% rate of change=100 (Fmax-Fmin)/F＜〉
Therefore, the variation size (mean value of measuring along cable relatively) of the said power measured of the shock point place degree of protection of indicating intumescent coating to provide.In general, be up to 20-25% with respect to the variation of mean value peel strength and be considered to acceptable.Table 5 has provided the changing value of sample 0-17a peel strength.Table 5: the % rate of change of peel strength
Cable The test for the second time of test for the first time
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16a 17 17a 62????????????78 40????????????- 18????????????- 27????????????- 13????????????- 21????????????- 17????????????23 9?????????????12 4?????????????5 19????????????15 9.8???????????12.5 4.3???????????2.5 7?????????????14 16????????????17 14????????????12 10????????????10 16????????????18 30????????????55 15.5??????????13 116???????????103
As what see from table 3, the peel strength percentage rate of change of sample 1 (not obtaining foaming) is extremely high; This absorption impact capacity that non-foamable polymer is described is than the same polymeric layer low significantly (referring to sample 3, having 61% intumescent coating) of the same thickness that has foamed.Sample 3 demonstrates the peel strength higher slightly than 25% limiting value to be changed; Mainly owing to the thickness of intumescent coating, this thickness 2-3mm thickness of other sample relatively only is 1mm to the limited shock strength of this sample.
Sample 5 (having the thick intumescent coating of 3mm) is owing to polymer foaming degree low (5%) has the peel strength of high numerical value, proved that therefore the shock strength that the low coating of foaming degree provides is more limited.And sample 4 (though expanded material thickness than sample 5 thin) has higher shock strength, compare 21% rate of change sample 5 its peel strengths be changed to 13%, proved that thus the high more shock strength that provides of foaming degree is high more.
By comparative sample 13 and sample 15, found out that concerning the foamed material layer and external sheath layer of same thickness the increase of polymer foaming degree (22-124%) is (peel strength is from the variation of 16-17% to 10%) that how to need the increase of coating shock strength.Confirmed this trend by comparative sample 16 and 17.Yet by with sample 16a and 17a (not having oversheath) and each sample 16 and 17 relatively, the contribution of oversheath impact protection is how to increase with the increase of foaming degree as can be seen.Embodiment 3
The shock strength contrast test of armored cable
Render a service for the shock strength of checking intumescent coating, test No. 10 cable conventional armoring cable.
Armored cable has and No. 10 identical cores (promptly be coated with the thick multi-thread conductor of about 14mm that one deck 0.5mm semiconductor material layer, one deck 3mm compound floor (this material is based on EPR) and one deck 0.5mm " easily strip off " semiconductor material layer (this material is based on the EVA with the carbon black reinforcement), total core thickness reaches about 22mm) of cable.According to:
A) the rubber-based encapsulant layer that about 0.6mm is thick;
B) the PVC sheath that about 0.66mm is thick;
C) 2 thick armoring steel bands of about respectively 0.5mm;
D) the thick MDPE oversheath of about 2mm from inside to outside holds said cable core successively.
Be compare test, use the dynamic machine (CEAST 6758 types) of " the weight type falls ".Carry out two groups of tests by the weight from 50cm eminence (about 54 joules of impact energys) and 20cm eminence (the about 21 joules of impact energys) 11kg that falls respectively; Assemble the snaphead of about 10mm radius in the impact end of weight.
The distortion of the cable result of gained is presented at Figure 4 and 5 (being respectively 50cm and 20cm height), a) expression of cable wherein of the present invention, conventional armoring cable b) expression.
Measure the distortion situation of core, so that estimate the damaged condition of the construction of cable.In fact, semiconductor-insulation-semiconductor sheath distortion is bigger, more may cause the electric damaged of cable insulation.The result gathers in table 6 to some extent.Table 6: the % thickness slip of semiconductor layer after impacting
Conventional armoring cable No. 10 cable
The 50cm eminence is impacted 41％ 26.5％
The 20cm eminence is impacted 4.4％ 2.9％
The result who sums up from table 6 finds out that the shock strength performance of cable of the present invention is better than conventional armoring cable.

Claims (28)

1, a kind of power transmission cable comprises:
A) conductor;
B) the fine and close insulating coating of one deck at least is positioned at around the said conductor; With
C) coating made by foamed polymer material of one deck, be positioned at said fine and close insulating coating around, wherein said polymeric material has predetermined mechanical strength property and predetermined foaming degree, so that shock-resistant characteristic is provided for said cable.
2, the desired cable of claim 1, wherein foamed polymer material is to be determined as the polymeric material acquisition of 200MPa at least by the bending modulus under its room temperature before the foaming according to ASTM standard D790.
3, the desired cable of claim 1, wherein said bending modulus is 400MPa-1800MPa.
4, the desired cable of claim 1, wherein said bending modulus is 600MPa-1500MPa.
5, the desired cable of claim 1, wherein the foaming degree of said polymeric material is about 20%-about 3000%.
6, the desired cable of claim 1, wherein the foaming degree of said polymeric material is about 30%-about 500%.
7, the desired cable of claim 1, wherein the foaming degree of said polymeric material is about 50%-about 200%.
8, aforesaid right requires each desired cable among the 1-7, and wherein the thickness of the coating of said foamed polymer material is 0.5mm.
9, aforesaid right requires each desired cable among the 1-7, and wherein the thickness of the coating of said foamed polymer material is 1-6mm.
10, aforesaid right requires each desired cable among the 1-7, and wherein the thickness of the coating of said foamed polymer material is 2-4mm.
11, the desired cable of claim 1, wherein said foamed polymer material are selected from polyethylene (PE), low density PE (LDPE), middle density PE (MDPE), high density PE (HDPE) and linear, low density PE (LLDPE); Polypropylene (PP); Ethylene propylene rubber (EPR), ethylene propylene copolymer (EPM), ethylene propylene diene terpolymers (EPDM); Natural rubber; Butyl rubber; Ethylene/vinyl acetate (EVA) copolymer; Polystyrene; Ethene/acrylic ester copolymer, ethylene/methyl acrylate (EMA) copolymer, ethylene/ethyl acrylate (EEA) copolymer, ethylene/butyl acrylate (EBA) copolymer; Ethylene/alpha-olefin copolymer; Acronitrile-butadiene-styrene (ABS) resin; Halogen polymer, polyvinyl chloride (PVC); Polyurethane; Polyamide; Aromatic polyester, polyethylene terephthalate (PET), polybutylene terephthalate (PBT); With and copolymer or mechanical impurity.
12, the desired cable of claim 1, wherein said foamed polymer material is based on polyolefin polymer or the copolymer of PE and/or PP.
13, the desired cable of claim 1, wherein said foamed polymer material are polyolefin polymer or the copolymers based on PE and/or PP with the ethylene propylene rubber modification.
14, the desired cable of claim 13, wherein said foamed polymer material are that the PP/EPR weight ratio is 90/10-50/50 with the polypropylene of ethylene propylene rubber (EPR) modification.
15, the desired cable of claim 14, wherein said PP/EPR weight ratio is 85/15-60/40.
16, the desired cable of claim 14, wherein said PP/ERP weight ratio is about 70/30.
17, the desired cable of claim 12, wherein said based on PE and/or PP polyolefin polymer or copolymer in also contain the vulcanized rubber of the powder type of scheduled volume.
18, the desired cable of claim 17, wherein the scheduled volume of the vulcanized rubber of powder type is the 10-60wt% of polymer.
19, aforesaid right requires each desired cable among the 1-18, and wherein said cable comprises outer polymer jacket.
20, the desired cable of claim 19, wherein said sheath and said foamable polymer coating contact.
21, claim 19 or 20 desired cables, wherein the thickness of said sheath is greater than 0.5mm.
22, claim 19 or 20 desired cables, wherein the thickness of said sheath is 1-5mm.
23, the method for shock strength is provided to power transmission cable, comprises and use the said cable of making by foamed polymer material of applying coating.
24, the desired method of claim 23 also comprises with the coated said intumescent coating of outer polymer jacket.
25, foamed polymer material provides the purposes of shock strength for power transmission cable.
26, evaluation comprises the method for the shock strength of the cable of one deck insulating coating at least, and this method is made up of following steps:
A) the average peel strength of the said insulating barrier of mensuration;
B) allow cable be subjected to the impact of predetermined power;
C) measure the peel strength of said insulating barrier at the shock point place;
D) check that the difference of average peel strength and the peel strength of measuring at the shock point place is less than predetermined value.
27, the desired method of claim 26, wherein peel strength is measured between insulating coating and outer coated semiconductor.
28, the desired method of claim 27, the difference of wherein average peel strength and the peel strength measured at the shock point place is less than 25%.
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