CN111599539A - Non-shielding twisted pair cable and preparation method thereof - Google Patents
Non-shielding twisted pair cable and preparation method thereof Download PDFInfo
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- CN111599539A CN111599539A CN202010631174.3A CN202010631174A CN111599539A CN 111599539 A CN111599539 A CN 111599539A CN 202010631174 A CN202010631174 A CN 202010631174A CN 111599539 A CN111599539 A CN 111599539A
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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
- H01B13/02—Stranding-up
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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
- H01B13/06—Insulating conductors or cables
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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
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
- H01B13/24—Sheathing; Armouring; Screening; Applying other protective layers by extrusion
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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
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
- H01B3/082—Wires with glass or glass wool
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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
- H01B3/42—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 polyesters; polyethers; polyacetals
- H01B3/421—Polyesters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/08—Several wires or the like stranded in the form of a rope
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- 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
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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
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
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Abstract
The invention relates to the field of cables, and discloses an unshielded twisted pair cable, which comprises a twisted pair layer and a sheath for coating the twisted pair layer, wherein the twisted pair layer comprises a plurality of protective layers which are sequentially arranged from inside to outside, and each protective layer is formed by a plurality of twisted pairs which are encircled into a circle; from the inner protective layer to the outer protective layer, the diameter of the twisted pair gradually increases; the cable can solve the problem that the cable material with high flame retardant property and high mechanical property is difficult to obtain in the prior art; a method for preparing an unshielded twisted pair cable comprises the following steps: the preparation method has the advantages of scientific, reasonable and simple design, simple operation and capability of realizing large-scale industrial production.
Description
Technical Field
The invention relates to the technical field of cables, in particular to an unshielded twisted pair cable and a preparation method thereof.
Background
Cables are generally rope-like cables made by stranding several wires or groups of wires, each group insulated from the other and often twisted around a center, the entire outer surface being covered with a highly insulating covering. The device is erected in the air or installed underground or underwater for telecommunication or power transmission; at the same time, the advantages of small occupied space, light weight and good flexibility are required, the high-reliability signal transmission is ensured to be provided in severe environment,
however, a plurality of stranded wires in the existing cable are basically the same in diameter, namely the same in cross-sectional area, and the current density, the transmission capacity, the corona loss and the like are not ideal when the cable is output, and the loss is large especially when the cable is used for high-altitude and underground operation; on the other hand, more and more fires are caused by the damage or aging of the cable sheath, and how to reduce the occurrence rate of the fires, the flame retardance and the environmental protection become the research and development application directions of the wire and cable industry.
Disclosure of Invention
The first purpose of the invention is to provide an unshielded twisted pair cable, which can solve the problems of small transmission capacity and large corona loss of the cable in the prior art and the problem that a cable material with high flame retardant property and high mechanical property is difficult to obtain;
the second purpose of the invention is to provide a preparation method of the unshielded twisted pair cable, which has scientific, reasonable and simple design and simple operation and can realize large-scale industrial production.
The embodiment of the invention is realized by the following steps:
an unshielded twisted pair cable comprises a twisted pair layer and a sheath for coating the twisted pair layer, wherein the twisted pair layer comprises a plurality of protective layers which are arranged in sequence from inside to outside, and each protective layer is formed by a plurality of twisted pairs which are encircled into a circle; the diameter of the twisted pair is gradually increased from the inner protective layer to the outer protective layer.
A method for preparing an unshielded twisted pair cable comprises the following steps:
s1, wire drawing: copper materials are selected, core wire conductors are manufactured by a wire drawing machine, and an insulating layer is wrapped outside each single wire conductor;
s2, pair twisting: the two core wires are a group of twisted wire pairs, and are twisted together by adopting a pair twisting structure;
s3, cabling: cabling by adopting a pre-back-twist cabling machine;
s4, sheathing: mixing the glass fiber, the elastomer, the carbon black, the polyphosphazene and the antioxidant according to the mass part ratio, mechanically stirring to obtain a mixture, and extruding and granulating the mixture to obtain a sheath; coating a layer of sheath outside the cable; protecting the cable;
s5, packaging: and (4) adopting a network analyzer to carry out strict high-frequency and low-frequency tests on all factory products, and then packaging and delivering the products out of a warehouse.
The invention has the beneficial effects that:
1. the cable of the invention gradually enlarges the diameter of the twisted pair from the inner layer to the outer layer, the potential gradient of the surface of the line is gradually reduced, the corona loss and the self vibration are reduced, the interference to the radio is reduced, the mechanical strength and the flexibility of the cable are improved, and particularly the tensile strength of the cable is greatly improved; meanwhile, the smaller the resistance loss per unit length of cable is at the same transmission capacity.
2. The sheath of the cable can cooperate with each other to play a role in synergy through the cooperation of the glass fiber, the SBS elastomer, the carbon black, the polyphosphazene and the antioxidant, and particularly, the glass fiber, the carbon black and the polyphosphazene are compounded to realize the synergy, so that the flame retardant property and the mechanical property of the cable are greatly improved; the polyphosphazene serving as a phosphorus-nitrogen flame retardant can exert the characteristics of high heat-resistant temperature, no precipitation and no halogen; the glass fiber has better flame retardance, insulativity, heat resistance, corrosion resistance and mechanical strength; the SBS elastomer has the characteristics of excellent tensile strength, large surface friction coefficient, good low-temperature performance, excellent electrical performance, good processability and the like, and the SBS elastomer and the carbon black are compounded and cooperated to play a role, so that the molecules can be interconnected, and the ultraviolet resistance and the aging resistance of the product are obviously improved.
3. According to the unshielded twisted pair cable and the preparation method thereof, the problem that a cable material with high flame retardant property and high mechanical property is difficult to obtain in the prior art can be solved; the preparation method of the unshielded twisted pair cable is scientific, reasonable and simple in design, simple in operation and capable of realizing large-scale industrial production.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural view of a cable provided in embodiments 1-2 of the present invention;
fig. 2 is a schematic structural view of a cable provided in embodiments 3 to 6 of the present invention.
1-jacket, 2-twisted pair layer, 21-outer shield layer, 22-middle shield layer, 23-inner shield layer, 3-twisted pair is shown.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The unshielded twisted pair cable and the method for manufacturing the same according to the embodiments of the present invention are described in detail below.
An unshielded twisted pair cable comprises a twisted pair layer 2 and a sheath 1 for coating the twisted pair layer 2, wherein the twisted pair layer 2 comprises a plurality of protective layers which are arranged in sequence from inside to outside, and each protective layer is formed by a plurality of twisted pairs 3 which are encircled into a circle; the diameter of the twisted pair 3 gradually increases from the inner protective layer 23 to the outer protective layer 21, wherein the diameter variation gradient of the twisted pair 3 of the protective layer is 0.05 mm-0.2 mm, and the minimum diameter of the twisted pair 3 of the innermost protective layer is 0.1 mm-0.3 mm.
The cable is not provided with a shielding outer sleeve, and the diameter of the twisted pair 3 is gradually increased from inside to outside, so that the overall diameter of the cable is reduced, and occupied space is saved; meanwhile, the diameter of the multi-layer diameter-variable twisted pair 3 is gradually increased from inside to outside, so that the potential gradient of the surface of the circuit is gradually reduced when the multi-layer diameter-variable twisted pair 3 is used, the corona loss and the self vibration are reduced, the interference to radio is reduced, the mechanical strength and the flexibility of the multi-layer diameter-variable twisted pair are improved, and particularly the tensile strength of the multi-layer diameter-variable twisted pair 3 is greatly improved; at the same time, the transmission capacity is improved and the resistance loss per unit length of cable is smaller at the same transmission capacity.
Further, the sheath 1 layer comprises the following components: the cable comprises glass fibers, an elastomer, carbon black, polyphosphazene and an antioxidant, and specifically, the sheath layer comprises the following components in parts by mass: 17-40 parts of glass fiber, 5-15 parts of elastomer, 15-30 parts of carbon black, 1-5 parts of polyphosphazene and 1-5 parts of antioxidant.
Further, the sheath 1 layer comprises the following components in parts by mass: 20-35 parts of glass fiber, 5-10 parts of elastomer, 15-25 parts of carbon black, 1-5 parts of polyphosphazene and 1-5 parts of antioxidant.
Further, the elastomer includes any one of SBS, polyolefin elastomer, acryl elastomer, or urethane thermoplastic elastomer, and preferably SBS is used as the elastomer.
Further, the antioxidant is a polyphenol antioxidant 1010.
The raw materials and the proportion thereof are matched with each other to play a role in synergy, and particularly, the glass fiber, the carbon black and the polyphosphazene are compounded to realize the synergy so as to greatly improve the flame retardant property and the mechanical property of the cable; the polyphosphazene serving as the phosphorus-nitrogen flame retardant can exert the characteristics of high heat-resistant temperature, no precipitation and no halogen, and can prevent the phenomena of precipitation of the polyphosphazene and great reduction of flame retardance after water absorption compared with the common compound phosphorus-nitrogen flame retardant system which uses melamine cyanurate and ammonium polyphosphate in a compounding way; meanwhile, the molecular structure of the polyphosphazene contains P, N elements, so that the flame retardant has lower dispersion difficulty and higher flame retardant efficiency compared with a mixture of melamine cyanurate and ammonium polyphosphate; the glass fiber has good insulativity, heat resistance, corrosion resistance and mechanical strength, and because the glass fiber is non-combustible, the glass fiber directly covers and blocks a fire source after contacting the fire source, thereby showing excellent flame retardant property; SBS is a thermoplastic elastomer with the most similar performance to rubber, and has the characteristics of excellent tensile strength, large surface friction coefficient, good low-temperature performance, excellent electrical performance, good processability and the like, but SBS is easy to age under long-term ultraviolet irradiation, and the ageing resistance is low; the inventor creatively finds that the addition of carbon black into SBS can generate the intermolecular interconnection, thereby obviously increasing the ultraviolet resistance and aging resistance of the product.
A method for preparing an unshielded twisted pair cable comprises the following steps:
s1, wire drawing: copper materials are selected, core wire conductors are manufactured by a wire drawing machine, and an insulating layer is wrapped outside each single wire conductor;
s2, pair twisting: the two core wires are a group of twisted wire pairs, and are twisted together by adopting a pair twisting structure;
s3, cabling: cabling by adopting a pre-back-twist cabling machine, wherein the back-twist rate is controlled to be 15-25%;
s4, sheathing: mixing the glass fiber, the elastomer, the carbon black, the polyphosphazene and the antioxidant according to the mass part ratio, mechanically stirring to obtain a mixture, and extruding and granulating the mixture to obtain a sheath; coating a layer of sheath outside the cable; the cable is protected.
S5, packaging: and (4) adopting a network analyzer to carry out strict high-frequency and low-frequency tests on all factory products, and then packaging and delivering the products out of a warehouse.
Example 1
The embodiment provides an unshielded twisted pair 3 cable, which comprises a twisted pair layer 2 and a sheath 1 for coating the twisted pair layer 2, wherein the twisted pair layer 2 comprises 2 protective layers which are sequentially arranged from inside to outside, an inner protective layer 23 is formed by surrounding 3 twisted pairs 3 into a circle, and an outer protective layer 21 is formed by surrounding 7 twisted pairs 3 into a circle; the diameter of the twisted pair 3 gradually increases from the inner protective layer 23 to the outer protective layer 21, wherein the diameter variation gradient of the twisted pair 3 of the protective layer is 0.1mm, and the minimum diameter of the twisted pair 3 of the innermost protective layer is 0.1 mm.
The sheath 1 comprises the following components: 35 parts of glass fiber, 8 parts of SBS, 18 parts of carbon black, 4 parts of polyphosphazene and 3 parts of antioxidant.
The embodiment also provides a preparation method of the unshielded twisted pair cable, which comprises the following steps:
s1, wire drawing: copper materials are selected, core wire conductors are manufactured by a wire drawing machine, and an insulating layer is wrapped outside each single wire conductor; s2, pair twisting: the two core wires are a group of twisted wire pairs, and are twisted together by adopting a pair twisting structure; s3, cabling: cabling by adopting a pre-back-twist cabling machine, wherein the back-twist rate is controlled to be 15-25%; s4, sheathing: mixing the glass fiber, the elastomer, the carbon black, the polyphosphazene and the antioxidant according to the mass part ratio, mechanically stirring to obtain a mixture, and extruding and granulating the mixture to obtain a sheath; coating a layer of sheath outside the cable; s5, packaging: and (4) adopting a network analyzer to carry out strict high-frequency and low-frequency tests on all factory products, and then packaging and delivering the products out of a warehouse.
Example 2
The embodiment provides an unshielded twisted pair 3 cable, which comprises a twisted pair layer 2 and a sheath 1 for coating the twisted pair layer 2, wherein the twisted pair layer 2 comprises 2 protective layers which are sequentially arranged from inside to outside, an inner protective layer 23 is formed by surrounding 3 twisted pairs 3 into a circle, and an outer protective layer 21 is formed by surrounding 7 twisted pairs 3 into a circle; the diameter of the twisted pair 3 gradually increases from the inner protective layer 23 to the outer protective layer 21, wherein the diameter variation gradient of the twisted pair 3 of the protective layer is 0.2mm, and the minimum diameter of the twisted pair 3 of the innermost protective layer is 0.2 mm.
The cable sheath 1 comprises the following components: 17 parts of glass fiber, 5 parts of SBS, 15 parts of carbon black, 1 part of polyphosphazene and 1 part of antioxidant.
The embodiment also provides a method for manufacturing an unshielded twisted pair cable, which includes the specific steps of embodiment 1.
Example 3
The embodiment provides an unshielded twisted pair 3 cable, which comprises a twisted pair layer 2 and a sheath 1 for coating the twisted pair layer 2, wherein the twisted pair layer 2 comprises 3 protective layers which are sequentially arranged from inside to outside, an inner protective layer 23 is formed by surrounding 3 twisted pairs 3 into a circle, a middle protective layer 22 is formed by surrounding 7 twisted pairs 3 into a circle, and an outer protective layer 21 is formed by surrounding 13 twisted pairs 3 into a circle; the diameter of the twisted pair 3 gradually increases from the inner protective layer 23 to the outer protective layer 21, wherein the diameter variation gradient of the twisted pair 3 of the protective layer is 0.05mm, and the minimum diameter of the twisted pair 3 of the innermost protective layer is 0.3 mm.
The sheath 1 layer comprises the following components: 40 parts of glass fiber, 15 parts of SBS, 30 parts of carbon black, 5 parts of polyphosphazene and 5 parts of antioxidant.
The embodiment also provides a method for manufacturing an unshielded twisted pair cable, which includes the specific steps of embodiment 1.
Example 4
The embodiment provides an unshielded twisted pair 3 cable, which comprises a twisted pair layer 2 and a sheath 1 for coating the twisted pair layer 2, wherein the twisted pair layer 2 comprises 3 protective layers which are sequentially arranged from inside to outside, an inner protective layer 23 is formed by surrounding 3 twisted pairs 3 into a circle, a middle protective layer 22 is formed by surrounding 7 twisted pairs 3 into a circle, and an outer protective layer 21 is formed by surrounding 13 twisted pairs 3 into a circle; the diameter of the twisted pair 3 gradually increases from the inner protective layer 23 to the outer protective layer 21, wherein the diameter variation gradient of the twisted pair 3 of the protective layer is 0.1mm, and the minimum diameter of the twisted pair 3 of the innermost protective layer is 0.2 mm.
The cable sheath 1 comprises the following components: 20 parts of glass fiber, 10 parts of SBS, 20 parts of carbon black, 3 parts of polyphosphazene and 3 parts of antioxidant.
The embodiment also provides a method for manufacturing an unshielded twisted pair cable, which includes the specific steps of embodiment 1.
Example 5
The embodiment provides an unshielded twisted pair 3 cable, which comprises a twisted pair layer 2 and a sheath 1 for coating the twisted pair layer 2, wherein the twisted pair layer 2 comprises 3 protective layers which are sequentially arranged from inside to outside, an inner protective layer 23 is formed by surrounding 3 twisted pairs 3 into a circle, a middle protective layer 22 is formed by surrounding 7 twisted pairs 3 into a circle, and an outer protective layer 21 is formed by surrounding 13 twisted pairs 3 into a circle; the diameter of the twisted pair 3 gradually increases from the inner protective layer 23 to the outer protective layer 21, wherein the diameter variation gradient of the twisted pair 3 of the protective layer is 0.06mm, and the minimum diameter of the twisted pair 3 of the innermost protective layer is 0.25 mm.
The cable sheath 1 comprises the following components: 25 parts of glass fiber, 12 parts of SBS, 25 parts of carbon black, 4 parts of polyphosphazene and 4 parts of antioxidant.
The embodiment also provides a method for manufacturing an unshielded twisted pair cable, which includes the specific steps of embodiment 1.
Example 6
The embodiment provides an unshielded twisted pair 3 cable, which comprises a twisted pair layer 2 and a sheath 1 for coating the twisted pair layer 2, wherein the twisted pair layer 2 comprises 3 protective layers which are sequentially arranged from inside to outside, an inner protective layer 23 is formed by surrounding 3 twisted pairs 3 into a circle, a middle protective layer 22 is formed by surrounding 7 twisted pairs 3 into a circle, and an outer protective layer 21 is formed by surrounding 13 twisted pairs 3 into a circle; the diameter of the twisted pair 3 gradually increases from the inner protective layer 23 to the outer protective layer 21, wherein the diameter variation gradient of the twisted pair 3 of the protective layer is 0.1mm, and the minimum diameter of the twisted pair 3 of the innermost protective layer is 0.2 mm.
The cable sheath 1 comprises the following components: 30 parts of glass fiber, 13 parts of SBS, 27 parts of carbon black, 3 parts of polyphosphazene and 4 parts of antioxidant.
The embodiment also provides a method for manufacturing an unshielded twisted pair cable, which includes the specific steps of embodiment 1.
Comparative example 1
The present comparative example provides an unshielded twisted pair cable comprising a twisted pair layer comprising a plurality of equal diameter twisted pairs, the twisted pairs having a diameter of 0.5mm, and a jacket covering the twisted pair layer.
The cable sheath comprises the following components: 17 parts of glass fiber, 5 parts of SBS, 15 parts of carbon black, 1 part of tripolyphosphate and 1 part of antioxidant.
This comparative example provides a method of making an unshielded twisted pair cable, using the specific steps of example 1.
Comparative example 2
The comparative example provides an unshielded twisted pair cable, which comprises a twisted pair layer and a sheath for coating the twisted pair layer, wherein the twisted pair layer comprises 2 protective layers which are sequentially arranged from inside to outside, an inner protective layer is formed by 3 twisted pairs which are encircled into a circle, and an outer protective layer is formed by 7 twisted pairs which are encircled into a circle; the diameter of the twisted pair gradually increases from the inner protective layer to the outer protective layer, wherein the diameter variation gradient of the twisted pair of the protective layer is 0.1mm, and the minimum diameter of the twisted pair of the innermost protective layer is 0.3 mm.
The cable sheath comprises the following components: 17 parts of glass fiber, 5 parts of SBS, 15 parts of carbon black, 1 part of melamine and 1 part of antioxidant.
This comparative example provides a method of making an unshielded twisted pair cable, using the specific steps of example 1.
Comparative example 3
The comparative example provides an unshielded twisted pair cable, which comprises a twisted pair layer and a sheath for coating the twisted pair layer, wherein the twisted pair layer comprises 3 protective layers which are sequentially arranged from inside to outside, an inner protective layer is formed by 3 twisted pairs which are encircled into a circle, a middle protective layer is formed by 7 twisted pairs which are encircled into a circle, and an outer protective layer is formed by 13 twisted pairs which are encircled into a circle; the diameter of the twisted pair gradually increases from the inner protective layer to the outer protective layer, wherein the diameter variation gradient of the twisted pair of the protective layer is 0.1mm, and the minimum diameter of the twisted pair of the innermost protective layer is 0.3 mm.
The sheath layer comprises the following components: 40 parts of glass fiber, 15 parts of polyurethane elastomer, 5 parts of polyphosphazene and 5 parts of antioxidant.
The embodiment also provides a method for manufacturing an unshielded twisted pair cable, which includes the specific steps of embodiment 1.
Comparative example 4
The comparative example provides an unshielded twisted pair cable, which comprises a twisted pair layer and a sheath for coating the twisted pair layer, wherein the twisted pair layer comprises 3 protective layers which are sequentially arranged from inside to outside, an inner protective layer is formed by 3 twisted pairs which are encircled into a circle, a middle protective layer is formed by 7 twisted pairs which are encircled into a circle, and an outer protective layer is formed by 13 twisted pairs which are encircled into a circle; the diameter of the twisted pair gradually increases from the inner protective layer to the outer protective layer, wherein the diameter variation gradient of the twisted pair of the protective layer is 0.1mm, and the minimum diameter of the twisted pair of the innermost protective layer is 0.3 mm.
The sheath layer comprises the following components: 15 parts of SBS, 30 parts of carbon black, 5 parts of polyphosphazene and 5 parts of antioxidant.
The embodiment also provides a method for manufacturing an unshielded twisted pair cable, which includes the specific steps of embodiment 1.
Examples of the experiments
The experimental method comprises the following steps: 6 test products and 4 control products prepared in examples 1 to 6 and comparative examples 1 to 4 were set as experimental groups 1 to 10, and the products of the experimental groups 1 to 10 were tested, respectively.
TABLE 1 Performance testing of experimental groups 1-10
As can be seen from the data in Table 1, the products provided by the experimental groups 1-6 all have better performances than the products provided by the experimental groups 7-10; the tensile strength of the products of the experimental groups 1-6 is 14.8-15.7 MPa; the elongation at break is 189-211%; the product is cracked through a thermal shock resistance test; the material can be used for a long time at 150 ℃, namely an aging test is carried out for 168 hours under the test condition of 180 ℃, and the change rate of the tensile strength and the elongation at break of the aged material is within +/-30 percent.
The cable of comparative example 1 used a plurality of equal diameter twisted pairs, comparative example 2 used no polyphosphazene and a polycyanate, comparative example 3 used no SBS elastomer and a polyurethane elastomer, and comparative example 4 used no glass fibers.
The tensile strength of the product of the experimental group 7 corresponding to the comparative example 1 is lower, the elongation at break and the tensile strength of the product of the experimental group 8 corresponding to the comparative example 2 are lower, and the product has a cracking phenomenon after a thermal shock resistance test; the elongation at break of the product of the experimental group 9 corresponding to the comparative example 3 is low, and the product has a cracking phenomenon after a thermal shock resistance test; the elongation at break of the product of the experimental group 10 corresponding to the comparative example 4 is low, and the product has a cracking phenomenon after a thermal shock resistance test;
the results show that the compounding of the glass fiber, the elastomer, the carbon black, the polyphosphazene and the antioxidant provided by the embodiment of the invention can generate specific correlation which cannot be replaced by other substances, and the flame retardant property and the mechanical property of the cable material can be greatly improved by virtue of synergistic interaction; particularly, the diameter of the twisted pair is gradually increased from the inner layer to the outer layer, the potential gradient of the surface of the circuit is gradually reduced, the corona loss and the self vibration are reduced, the interference to the radio is reduced, the mechanical strength and the flexibility of the twisted pair are improved, and particularly the tensile strength of the twisted pair is greatly improved; meanwhile, the smaller the resistance loss per unit length of cable is at the same transmission capacity.
In summary, according to the unshielded twisted pair cable and the preparation method thereof provided by the embodiments of the present invention, the unshielded twisted pair cable can solve the problem that it is difficult to obtain a cable material with high flame retardant property and high mechanical property in the prior art; the preparation method of the unshielded twisted pair cable is scientific, reasonable and simple in design, simple in operation and capable of realizing large-scale industrial production.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An unshielded twisted pair cable is characterized by comprising a twisted pair layer and a sheath for coating the twisted pair layer, wherein the twisted pair layer comprises a plurality of protective layers which are arranged in sequence from inside to outside, and each protective layer is formed by a plurality of twisted pairs which are encircled into a circle; the diameter of the twisted pair is gradually increased from the inner protective layer to the outer protective layer.
2. The unshielded twisted pair cable according to claim 1, wherein said diameter variation gradient of twisted pairs of said shielding layer is in the range of 0.05mm to 0.2 mm.
3. The unshielded twisted pair cable according to claim 1, wherein the minimum diameter of the twisted pairs of said shielding layer is between 0.1mm and 0.3 mm.
4. The unshielded twisted pair cable according to claim 1, wherein said jacket layer comprises the following composition: glass fiber, elastomer, carbon black, polyphosphazene and antioxidant.
5. The unshielded twisted pair cable according to claim 4, wherein said jacket layer comprises the following components in parts by mass: 17-40 parts of glass fiber, 5-15 parts of elastomer, 15-30 parts of carbon black, 1-5 parts of polyphosphazene and 1-5 parts of antioxidant.
6. The unshielded twisted pair cable according to claim 5, wherein said sheath layer comprises the following components in parts by mass: 20-35 parts of glass fiber, 5-10 parts of elastomer, 15-25 parts of carbon black, 1-5 parts of polyphosphazene and 1-5 parts of antioxidant.
7. The unshielded twisted pair cable according to claim 6, wherein said elastomer comprises any one of SBS, polyolefin elastomer, or propylene-based elastomer.
8. The unshielded twisted pair cable according to claim 6, wherein said antioxidant is polyphenolic antioxidant 1010.
9. A method of manufacturing an unshielded twisted pair cable according to any one of claims 5 to 8, comprising the steps of:
s1, wire drawing: copper materials are selected, core wire conductors are manufactured by a wire drawing machine, and an insulating layer is wrapped outside each single wire conductor;
s2, pair twisting: the two core wires are a group of twisted wire pairs, and are twisted together by adopting a pair twisting structure;
s3, cabling: cabling by adopting a pre-back-twist cabling machine;
s4, sheathing: mixing the glass fiber, the elastomer, the carbon black, the polyphosphazene and the antioxidant according to the mass part ratio, mechanically stirring to obtain a mixture, and extruding and granulating the mixture to obtain a sheath; coating a layer of sheath outside the cable; protecting the cable;
s5, packaging: and (4) adopting a network analyzer to package and deliver all products out of the warehouse after high-frequency and low-frequency tests.
10. The method as claimed in claim 9, wherein the untwisting rate in the step S3 is controlled to 15-25%.
Priority Applications (1)
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| CN202010631174.3A CN111599539A (en) | 2020-07-03 | 2020-07-03 | Non-shielding twisted pair cable and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112562923A (en) * | 2020-12-09 | 2021-03-26 | 浙江中兴电缆有限公司 | Improved high-flame-retardant fire-resistant twisted pair manufacturing process |
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Application publication date: 20200828 |