CN115579179A - Longitudinal and radial water-blocking cable and manufacturing method thereof - Google Patents

Longitudinal and radial water-blocking cable and manufacturing method thereof Download PDF

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Publication number
CN115579179A
CN115579179A CN202211356517.5A CN202211356517A CN115579179A CN 115579179 A CN115579179 A CN 115579179A CN 202211356517 A CN202211356517 A CN 202211356517A CN 115579179 A CN115579179 A CN 115579179A
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CN
China
Prior art keywords
water
blocking
cable
layer
longitudinal
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CN202211356517.5A
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Chinese (zh)
Inventor
翟元辉
李智棣
李焕婷
李智强
李敏婷
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Guangdong Zhonglian Cable Group Co ltd
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Guangdong Zhonglian Cable Group Co ltd
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Priority to CN202211356517.5A priority Critical patent/CN115579179A/en
Publication of CN115579179A publication Critical patent/CN115579179A/en
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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
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
    • H01B7/288—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using hygroscopic material or material swelling in the presence of liquid
    • 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
    • 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
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
    • 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
    • H01B13/32—Filling or coating with impervious material
    • 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
    • H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
    • H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
    • H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/021—Features relating to screening tape per se
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables

Abstract

The invention discloses a longitudinal and radial water-blocking cable and a manufacturing method thereof. The gap of the composite cable core is filled with super-absorbent composite water-blocking yarns; the water blocking belt layer is formed by weaving super-absorbent composite water blocking yarns; the super-absorbent composite water-blocking yarn is made of matrix yarn and super-absorbent resin, wherein the super-absorbent resin is water-absorbent resin mixed glue solution solidified on the matrix yarn. According to the invention, the water-blocking yarns are filled in the gaps of the composite cable core, and the longitudinal aluminum-plastic-coated composite tape water-blocking layer and the water-blocking tape layer are arranged on the cable core, so that the cable is endowed with an excellent water-blocking effect, the full water-blocking capability of the radial and longitudinal water blocking of the cable is greatly improved, the damage of moisture to the cable is further prevented, the long-term normal operation of the cable in outdoor or humid environment is ensured, and the service life of the cable is prolonged.

Description

Longitudinal and radial water-blocking cable and manufacturing method thereof
Technical Field
The invention belongs to the technical field of wires and cables, and particularly relates to a longitudinal and radial water-blocking cable and a manufacturing method thereof.
Background
The cross-linked polyethylene insulating material is a new type of cable material and is made up by using new technological process. According to the research and development of the applicant, cable constructors have low awareness of the protection of the crosslinked polyethylene cable against water and moisture in the using process. On one hand, the crosslinked polyethylene insulated cable has good waterproof performance; on the other hand, because the development and application time of the current crosslinked polyethylene insulation is short, when the cable outlet is affected by damp and water, the related experience can be referred to, thereby affecting the normal operation function of the cable.
The applicant researches and discovers that the crosslinked polyethylene cable is affected with damp or water during the use process, and the reasons are many. Because the protection concept of cable constructors or users is thin, the normal service life of the cross-linked cable can be directly interfered, and huge potential safety hazards are buried for the whole power supply system.
Disclosure of Invention
The invention aims to solve the technical problems and provides a longitudinal and radial water-blocking cable and a manufacturing method thereof.
In order to solve the problems, the invention is realized according to the following technical scheme:
in a first aspect, the invention provides a longitudinal and radial water-blocking cable, which comprises a composite cable core, a winding tape layer, a longitudinal aluminum-plastic-coated composite tape water-blocking layer, an inner sheath, a water-blocking tape layer, an armor layer and an outer sheath, wherein the composite cable core, the winding tape layer, the longitudinal aluminum-plastic-coated composite tape water-blocking layer, the inner sheath, the water-blocking tape layer, the armor layer and the outer sheath are sequentially arranged from inside to outside;
the gap of the composite cable core is filled with super-absorbent composite water-blocking yarns; the water-blocking tape layer is formed by weaving super-absorbent composite water-blocking yarns;
the super-absorbent composite water-blocking yarn is made of matrix yarn and super-absorbent resin, and the super-absorbent resin is water-absorbent resin mixed glue solution solidified on the matrix yarn.
With reference to the first aspect, the present invention further provides a 1 st preferred embodiment of the first aspect, specifically, the water-absorbent resin mixed glue solution is prepared from the following raw materials in parts by weight: 75 to 85 portions of acrylic acid, 25 to 30 portions of acrylic ester, 40 to 45 portions of sodium hydroxide, 5 to 8 portions of 800 to 1000um coconut fiber, 0.2 to 0.4 portion of initiator, 0.4 to 0.6 portion of cross linker, 3 to 5 portions of surfactant and a proper amount of deionized water.
With reference to the first aspect, the present invention further provides a 2 nd preferred embodiment of the first aspect, and specifically, the water-absorbent resin mixed glue solution is composed of the following raw materials in parts by weight: 80 parts of acrylic acid, 26 parts of acrylic ester, 44 parts of sodium hydroxide, 6 parts of 800-1000 um coconut fiber, 0.3 part of initiator, 0.5 part of cross-linking agent, 4 parts of surfactant and a proper amount of deionized water.
With reference to the first aspect, the present invention further provides a 3 rd preferred embodiment of the first aspect, specifically, the water-absorbent resin mixed glue solution is prepared by the following steps:
firstly, dissolving sodium hydroxide in deionized water according to a ratio of 11; adding acrylic acid, acrylic ester and an initiator according to the proportion in sequence, mixing and heating to 60 ℃;
then, polymerizing the mixed solution for 3 hours under the protection of nitrogen to obtain water-absorbent resin glue solution; adding cross-linking agent and surfactant into the water-absorbing resin glue solution according to a certain proportion, and then adding a proper amount of deionized water to obtain the water-absorbing resin mixed glue solution with the required concentration.
In combination with the first aspect, the present invention also provides a 4 th preferred embodiment of the first aspect, specifically, the matrix yarn is a yarn formed by cabling aramid filaments, stainless steel filaments and Coolmax fibers.
With reference to the first aspect, the present invention further provides a 5 th preferred embodiment of the first aspect, and specifically, the outer sheath is a dense medium density polyethylene material extruded on the armor layer.
With reference to the first aspect, the present invention further provides a 6 th preferred embodiment of the first aspect, specifically, the wrapping tape layer adopts a water blocking tape, and the inner sheath is made of a compact medium density polyethylene material and is extruded and wrapped on the water blocking layer of the longitudinally wrapped aluminum-plastic composite tape.
With reference to the first aspect, the present invention further provides a 7 th preferred embodiment of the first aspect, and specifically, the armor layer is formed by wrapping a double-layer galvanized steel strip.
With reference to the first aspect, the present invention further provides an 8 th preferred embodiment of the first aspect, and specifically, the composite cable core includes a plurality of insulated cables, and each insulated cable includes a conductor and a cross-linked polyethylene insulating sheath.
In a second aspect, the present invention also provides a manufacturing method for preparing a longitudinal and radial water-blocking cable of the first aspect, said manufacturing method comprising the steps of:
(1) The prefabricated composite cable core and the water-blocking yarn are input into equipment for cabling, and a water-blocking tape is wound and wrapped outside the cable core in the cabling process to form a wound and wrapped tape layer;
(2) Longitudinally wrapping an aluminum-plastic composite belt on the wrapping belt layer, and extruding a compact medium-density polyethylene material inner sheath material outside the cable core longitudinally wrapped with the aluminum-plastic composite belt water-blocking layer by adopting an extrusion process through an extruder and an extrusion die to form an inner sheath;
(3) Wrapping a water-blocking tape on the inner protective sleeve to form a water-blocking tape layer, and then forming an armor layer by wrapping a double-layer galvanized steel tape;
(4) And extruding the compact medium-density polyethylene material outer sheath material on the armor layer by an extruder and an extrusion die by adopting an extrusion process to form the outer sheath layer. Compared with the prior art, the invention has the beneficial effects that:
the invention provides a longitudinal and radial water-blocking cable which comprises a composite cable core, a winding tape layer, a longitudinal aluminum-plastic-coated composite tape water-blocking layer, an inner sheath, a water-blocking tape layer, an armor layer and an outer sheath which are sequentially arranged from inside to outside. The gap of the composite cable core is filled with super-absorbent composite water-blocking yarns; the water blocking belt layer is formed by weaving super-absorbent composite water blocking yarns; the super-absorbent composite water-blocking yarn is made of matrix yarn and super-absorbent resin, wherein the super-absorbent resin is water-absorbent resin mixed glue solution solidified on the matrix yarn.
According to the invention, the water-blocking yarns are filled in the gaps of the composite cable core, and the longitudinal aluminum-plastic-coated composite tape water-blocking layer and the water-blocking tape layer are arranged on the cable core, so that the cable is endowed with an excellent water-blocking effect, the full water-blocking capability of the radial and longitudinal water blocking of the cable is greatly improved, the damage of moisture to the cable is further prevented, the long-term normal operation of the cable in outdoor or humid environment is ensured, and the service life of the cable is prolonged.
Drawings
Embodiments of the invention are described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic view of the layer structure of a longitudinal and radial water-blocking cable of the present invention;
FIG. 2 is a schematic view of the process flow of the superabsorbent composite water-blocking yarn of the present invention;
in the figure:
1-a base yarn; 2-a guide wire magnetic ring; 3-godet roller; 4-impregnation liquid; 5-double rollers; 6-a thermal channel; 7-super absorbent composite water-blocking yarn.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The applicant researches and discovers that the reasons for the moisture or water ingress of the crosslinked polyethylene cable in the using process are many, and can be broadly divided into two main categories, namely internal reasons and external reasons, which are as follows:
(1) The crosslinked polyethylene cable is a high molecular polymer, which is formed by taking ethylene molecules as monomers through polymerization under certain chemical reaction conditions and the catalytic action of a catalyst. Since the main component of the crosslinked polyethylene cable is polyethylene molecules, the analysis thereof is very insoluble in water, and the structure of the polyethylene analysis is long chain. The linear structure, which is a crystalline polymer, is such that when polyethylene in the cable is analyzed in a normal arrangement, the crystalline part and amorphous part inside the cable are in a coexisting state, so that the arrangement between the crystalline molecules inside the cable is very tight. However, in the case of amorphous molecules, the arrangement between the particles is very loose, and there are large gaps between molecules, which makes it easy for water molecules to intrude into the gaps between amorphous molecules. In the case of a crosslinked polyethylene cable obtained by addition polymerization of ethylene, certain impurities and crosslinking by-products are present between the molecular particles. Therefore, if the crosslinked polyethylene cable is placed in a humid external environment, moisture and water can be soaked into the cable core and the sheath, and once an alternating voltage is applied to the crosslinked polyethylene cable, water molecules attached to the crosslinked cable core and the sheath can form spots with impurities under the action of an electric field in the cable core, so that the cable core is subjected to electrochemical corrosion. In addition, the existence of impurities in the crosslinked cable can cause the resistance value of the crosslinked cable to be increased, and the heat generated during the operation of the cable can be increased, so that the corrosion and the aging of the crosslinked cable are further accelerated.
(2) The crosslinked polyethylene is susceptible to external environmental factors, such as mechanical friction, during transportation, installation, etc., thereby causing damage to the cable. Once the cable outer sheath is damaged mechanically, the main structure of the crosslinked polyethylene cable is easily corroded by water vapor, so that the normal function of the crosslinked polyethylene insulated cable is damaged. Finally, in the actual use process, the cable is directly exposed to the outside, and is easily broken down by high voltage, so that the outgoing line of the cable is damaged.
(3) The crosslinked polyethylene insulated cable is soaked in water for a long time. Particularly, when cables are laid in regions with severe natural geographic environments and dense mountains and lakes, the crosslinked polyethylene insulated cables can be in a high-humidity environment for a long time or even soaked in water for a long time under the influence of geographic geological factors, so that the crosslinked cables are directly damaged.
Therefore, the invention is based on the problem that the water resistance of the crosslinked polyethylene insulated cable is poor, which results in short service life. A crosslinked polyethylene cable that is longitudinally and radially water-blocked, and related methods of manufacture, are provided.
As shown in figure 1, the longitudinal and radial water-blocking cable provided by the invention comprises a composite cable core, a winding tape layer, a longitudinal aluminum-plastic-coated composite tape water-blocking layer, an inner sheath, a water-blocking tape layer, an armor layer and an outer sheath which are sequentially arranged from inside to outside. The gap of the composite cable core is filled with super-absorbent composite water-blocking yarns; the water blocking belt layer is formed by weaving super-absorbent composite water blocking yarns; the super-absorbent composite water-blocking yarn is made of matrix yarn and super-absorbent resin, wherein the super-absorbent resin is water-absorbent resin mixed glue solution solidified on the matrix yarn.
In a specific implementation, the outer sheath is a dense medium density polyethylene material extruded on the armor layer. The wrapping tape layer adopts a water-blocking tape, and the inner sheath is made of compact medium-density polyethylene material and is extruded and wrapped on the water-blocking layer of the longitudinal aluminum-plastic composite tape. The armor layer is formed by wrapping a double-layer galvanized steel strip. The composite cable core comprises a plurality of insulated cables, and each insulated cable comprises a conductor and a cross-linked polyethylene insulated sheath.
In a specific implementation, the invention also provides a method for manufacturing a longitudinal and radial water-blocking cable, comprising the following steps:
(1) The prefabricated composite cable core and the water-blocking yarn are input into equipment for cabling, and a water-blocking tape is wound and wrapped outside the cable core in the cabling process to form a wound and wrapped tape layer;
(2) Longitudinally wrapping an aluminum-plastic composite belt on the wrapping belt layer, and extruding a compact medium-density polyethylene material inner sheath material outside the cable core longitudinally wrapped with the aluminum-plastic composite belt water-blocking layer by adopting an extrusion process through an extruder and an extrusion die to form an inner sheath;
(3) Wrapping a water-blocking tape on the inner protective sleeve to form a water-blocking tape layer, and then forming an armor layer by wrapping a double-layer galvanized steel tape;
(4) And extruding the compact medium-density polyethylene material outer sheath material on the armor layer by an extruder and an extrusion die by adopting an extrusion process to form the outer sheath layer.
Super-absorbent composite water-blocking yarn
The core of the invention lies in that the super absorbent composite water-blocking yarn is made of novel super absorbent resin.
Specifically, the water-absorbent resin mixed glue solution is prepared from the following raw materials in parts by weight: 75 to 85 portions of acrylic acid, 25 to 30 portions of acrylic ester, 40 to 45 portions of sodium hydroxide, 5 to 8 portions of 800 to 1000um coconut fiber, 0.2 to 0.4 portion of initiator, 0.4 to 0.6 portion of cross linker, 3 to 5 portions of surfactant and a proper amount of deionized water.
The invention adopts acrylic acid, sodium hydroxide and acrylic ester to prepare sodium acrylate and acrylic ester copolymer glue solution through polymerization reaction, coats the glue solution on the surface of matrix yarn, and is crosslinked into super water-absorbent resin on the surface of fiber after heating treatment, so that the fiber can rapidly expand when water is infiltrated, and the super water-absorbent resin plays a role in water resistance in a cable.
The research of the applicant finds that the super absorbent resin is compounded with 800-1000 um coconut shell fiber, so that the coconut shell fiber is beneficial to a large number of cavity structures on the surface of the coconut shell fiber, the specific surface energy of the coconut shell fiber is higher, and the siphon effect on free water is stronger. Therefore, through the siphon benefit of utilizing the coconut husk fibre, when super absorbent resin absorbs water, inside coconut husk fibre absorbs moisture with moisture content is fast scattered wet, and the moisture absorption performance of yarn is blocked water in order to strengthen in coordination with super absorbent resin's water absorption characteristic, and cavity structure in the coconut husk fibre can also pin moisture simultaneously.
The invention also provides a manufacturing method of the water-absorbent resin mixed glue solution, which comprises the following steps:
firstly, dissolving sodium hydroxide in deionized water according to a ratio, wherein the mass ratio of the sodium hydroxide to the deionized water is 11; adding acrylic acid, acrylic ester and an initiator according to the proportion in sequence, mixing and heating to 60 ℃;
then, polymerizing the mixed solution for 3 hours under the protection of nitrogen to obtain water-absorbent resin glue solution; adding cross-linking agent and surfactant into the water-absorbing resin glue solution according to a certain proportion, and then adding a proper amount of deionized water to obtain the water-absorbing resin mixed glue solution with the required concentration.
In one specific implementation, the mass percentage concentration of the water-absorbent resin mixed glue solution is 50-80%.
It should be noted that the preparation of the water-absorbent resin mixed glue solution with a desired concentration can be adjusted by those skilled in the art according to actual needs, and the invention is not limited thereto. For example, if multiple dip curing is performed, the corresponding concentration may be reduced.
In a preferred implementation, the matrix yarn is a yarn composed of aramid filaments, stainless steel microfilaments and Coolmax fibers twisted together. In specific implementation, aramid 1313 (fineness of 200D, breaking strength of 4.1cN/dtex, oil content of 1.5%, elongation at break of 20%) and 316L-type stainless steel microfilaments (diameter of 0.035mm, breaking strength of 91cN, elongation at break of 21.3%) are used. Doubling an aramid filament, a stainless steel filament and a Coolmax fiber by adopting a doubling winder, and twisting the doubled aramid filament, the stainless steel filament and the Coolmax fiber in a two-for-one twister to synthesize yarns.
Specifically, the technological parameters of doubling are as follows: the twist is 30T/(10 cm), the winding tension compensation is 1N, and when the ingot speed is 6000r/min, the composite yarn has good performance.
The yarns are formed by doubling and twisting aramid filaments, stainless steel microfilaments and Coolmax fibers, and the three fibers are utilized to cooperatively enhance the yarn strength of the super-absorbent composite water-blocking yarn and cooperatively enhance the mechanical property. On the other hand, the electromagnetic shielding performance is endowed to the yarn through the stainless steel microfilament. On the other hand, the structure characteristics of the Coolmax fibers are utilized to rapidly conduct moisture and disperse moisture of the water-blocking yarns to form a moisture-conducting channel to enlarge the contact area between the moisture and the super-absorbent resin, so that the water absorption is faster, and the problems of cable breakdown or water-blocking performance failure and the like caused by the fact that the moisture is locally concentrated on the cable are avoided. In addition, coolmax fibers and coconut shell fibers of super absorbent resin play a synergistic role, moisture is quickly transferred and dissipated, and the water blocking effect achieved by the water blocking yarns through water absorption expansion of water is improved.
When the water-blocking yarn is applied to weaving the water-blocking tape, water can be rapidly dispersed in all directions, and water can be absorbed more rapidly.
As shown in fig. 2, the invention also provides a preparation process of the super-absorbent water-blocking yarn: impregnating the unreeled matrix yarn with the water-absorbent resin mixed glue solution, removing the redundant water-absorbent resin mixed glue solution through a double roller, drying through a heat treatment channel, crosslinking the sodium polyacrylate copolymer into super water-absorbent resin, and finally rolling the treated fiber to obtain the super water-absorbent composite water-blocking yarn.
The invention also provides a preparation example and related performance test data of the super-absorbent composite water-blocking yarn, wherein the preparation example comprises the following steps:
example 1
The super-absorbent composite water-blocking yarn described in this embodiment 1 is prepared by the following preparation process:
and (3) impregnating the unreeled matrix yarns with the water-absorbent resin mixed glue solution, removing the redundant water-absorbent resin mixed glue solution through a double roller, drying through a heat treatment channel, crosslinking the sodium polyacrylate copolymer into super water-absorbent resin, and finally rolling the treated fibers to obtain the super water-absorbent composite water-blocking yarns.
The base yarn is a yarn formed by doubling and twisting aramid filaments, stainless steel microfilaments and Coolmax fibers. The water-absorbent resin mixed glue solution is prepared from the following raw materials in parts by weight: 75 parts of acrylic acid, 25 parts of acrylic ester, 40 parts of sodium hydroxide, 5 parts of 800-1000 um coconut fiber, 0.2 part of initiator, 0.4 part of cross-linking agent, 3 parts of surfactant and a proper amount of deionized water. Initiator potassium persulfate, surfactant polyethylene glycol and cross-linking agent ethylene glycol dimethacrylate.
Specifically, the mass percentage concentration of the water-absorbent resin mixed glue solution is 80%.
Example 2
The super-absorbent composite water-blocking yarn described in this embodiment 2 is prepared by the following preparation process:
impregnating the unreeled matrix yarn with the water-absorbent resin mixed glue solution, removing the redundant water-absorbent resin mixed glue solution through a double roller, drying through a heat treatment channel, crosslinking the sodium polyacrylate copolymer into super water-absorbent resin, and finally rolling the treated fiber to obtain the super water-absorbent composite water-blocking yarn.
The base yarn is a yarn formed by doubling and twisting aramid filaments, stainless steel microfilaments and Coolmax fibers. The water-absorbent resin mixed glue solution is composed of the following raw materials in parts by weight: 80 parts of acrylic acid, 26 parts of acrylic ester, 44 parts of sodium hydroxide, 6 parts of 800-1000 um coconut fiber, 0.3 part of initiator, 0.5 part of cross-linking agent, 4 parts of surfactant and a proper amount of deionized water. Initiator potassium persulfate, surfactant polyethylene glycol and cross-linking agent ethylene glycol dimethacrylate.
Specifically, the mass percentage concentration of the water-absorbent resin mixed glue solution is 80%.
Example 3
The super-absorbent composite water-blocking yarn described in embodiment 3 is prepared by the following preparation process:
impregnating the unreeled matrix yarn with the water-absorbent resin mixed glue solution, removing the redundant water-absorbent resin mixed glue solution through a double roller, drying through a heat treatment channel, crosslinking the sodium polyacrylate copolymer into super water-absorbent resin, and finally rolling the treated fiber to obtain the super water-absorbent composite water-blocking yarn.
The base yarn is a yarn formed by doubling and twisting aramid filaments, stainless steel microfilaments and Coolmax fibers. The water-absorbent resin mixed glue solution is prepared from the following raw materials in parts by weight: 85 parts of acrylic acid, 30 parts of acrylic ester, 45 parts of sodium hydroxide, 8 parts of 800-1000 um coconut fiber, 0.4 part of initiator, 0.6 part of cross-linking agent, 5 parts of surfactant and a proper amount of deionized water.
Specifically, the mass percentage concentration of the water-absorbent resin mixed glue solution is 80%.
Product testing and inspection
Comparative example 1
The water-blocking yarn of comparative example 1, the formulation and process were identical to those of example 2, except that the matrix yarn used aramid yarn and stainless steel microfilament.
Comparative example 2
The water-blocking yarn of comparative example 2 was completely the same as example 2 except that the water-absorbent resin mixed dope did not contain coir and the others were unchanged.
Comparative example 3
The formula and the process of the water-blocking yarn of the comparative example 3 are completely the same as those of the example 2, except that the matrix yarn adopts aramid yarn and stainless steel microfilaments; the water-absorbing resin mixed glue solution does not contain coconut fiber, and the others are unchanged.
The test method comprises the following steps:
(1) The water absorption performance of the super-absorbent composite water-blocking yarn is as follows YD/T115.2-2001, the second part of the water-blocking material for the communication cable and the optical cable: water blocking yarn.
(2) The mechanical properties of the super-absorbent composite water-blocking yarn are tested by adopting an INSTRON4302 tensile machine according to GB/T19975-2005 'test method for tensile properties of high-strength fiber filaments'. The test results are shown in Table 1
TABLE 1 comparison of water-blocking yarn test results
Item Example 1 Example 2 Example 3 Comparative example 1 Comparative example 2 Comparative example 3
Expansion ratio (ml/g) 133 138 134 102 98 82
Expansion Rate (ml/g/min) 128 135 130 98 92 74
Tensile Strength (N) 25.9 26.2 26.0 22.4 25.7 21.8
Elongation at Break (%) 18.6 18.9 18.3 16.2 18.5 15.5
Therefore, the super-absorbent resin added with the coconut fiber is cooperated with the matrix yarn compounded with the Coolmax fiber, so that the water absorption rate and the water absorption expansion effect of the super-absorbent composite water-blocking yarn are greatly improved. The water-blocking performance of the crosslinked polyethylene insulated cable is improved and the service life of the cable is effectively prolonged by increasing the water-blocking capability of the super-absorbent composite water-blocking yarn.
Other configurations of a longitudinal and radial water-blocking cable and method of making the same are described in the present embodiment with reference to the prior art.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (10)

1. A longitudinal and radial water-blocking cable is characterized by comprising a composite cable core, a winding tape layer, a longitudinal aluminum-plastic-coated composite tape water-blocking layer, an inner sheath, a water-blocking tape layer, an armor layer and an outer sheath which are sequentially arranged from inside to outside;
the gap of the composite cable core is filled with super-absorbent composite water-blocking yarns; the water-blocking tape layer is formed by weaving super-absorbent composite water-blocking yarns;
the super-absorbent composite water-blocking yarn is made of matrix yarn and super-absorbent resin, wherein the super-absorbent resin is water-absorbent resin mixed glue solution solidified on the matrix yarn.
2. A longitudinal and radial water-blocking cable according to claim 1, wherein:
the water-absorbent resin mixed glue solution is prepared from the following raw materials in parts by weight: 75 to 85 portions of acrylic acid, 25 to 30 portions of acrylic ester, 40 to 45 portions of sodium hydroxide, 5 to 8 portions of 800 to 1000um coconut shell fiber, 0.2 to 0.4 portion of initiator, 0.4 to 0.6 portion of cross linker, 3 to 5 portions of surfactant and a proper amount of deionized water.
3. A longitudinal and radial water-blocking cable according to claim 2, wherein:
the water-absorbent resin mixed glue solution is prepared from the following raw materials in parts by weight: 80 parts of acrylic acid, 26 parts of acrylic ester, 44 parts of sodium hydroxide, 6 parts of 800-1000 um coconut fiber, 0.3 part of initiator, 0.5 part of cross-linking agent, 4 parts of surfactant and a proper amount of deionized water.
4. A longitudinal and radial water-blocking cable according to claim 3, wherein:
the water-absorbent resin mixed glue solution is prepared by the following steps:
firstly, dissolving sodium hydroxide in deionized water according to a ratio, wherein the mass ratio of the sodium hydroxide to the deionized water is 11; adding acrylic acid, acrylic ester and an initiator according to the proportion in sequence, mixing and heating to 60 ℃;
then, polymerizing the mixed solution for 3 hours under the protection of nitrogen to obtain water-absorbent resin glue solution; adding cross-linking agent and surfactant into the water-absorbing resin glue solution according to a certain proportion, and then adding a proper amount of deionized water to obtain the water-absorbing resin mixed glue solution with the required concentration.
5. A longitudinal and radial water-blocking cable according to claim 1, wherein:
the matrix yarn is formed by doubling and twisting aramid filaments, stainless steel microfilaments and Coolmax fibers.
6. A longitudinal and radial water-blocking cable according to claim 1, wherein:
the outer sheath is made of compact medium density polyethylene material and is extruded on the armor layer.
7. A longitudinal and radial water-blocking cable according to claim 1, wherein:
the wrapping tape layer adopts a water-blocking tape, and the inner sheath is made of compact medium-density polyethylene material and extruded and wrapped on the water-blocking tape of the longitudinal aluminum-plastic composite tape.
8. A longitudinal and radial water-blocking cable according to claim 1, wherein:
the armor layer is formed by wrapping a double-layer galvanized steel strip.
9. A longitudinal and radial water-blocking cable according to claim 1, wherein:
the composite cable core comprises a plurality of insulated cables, and each insulated cable comprises a conductor and a cross-linked polyethylene insulated sheath.
10. A method of manufacturing a longitudinal and radial water-blocking cable according to any one of claims 1 to 9, characterized in that it comprises the following steps:
(1) The prefabricated composite cable core and the water-blocking yarn are input into equipment for cabling, and a water-blocking tape is wound and wrapped outside the cable core in the cabling process to form a wound and wrapped tape layer;
(2) Longitudinally wrapping an aluminum-plastic composite belt on the wrapping belt layer, and extruding a compact medium-density polyethylene material inner sheath material outside the cable core longitudinally wrapped with the aluminum-plastic composite belt water-blocking layer by adopting an extrusion process through an extruder and an extrusion die to form an inner sheath;
(3) Wrapping a water-blocking tape on the inner protective sleeve to form a water-blocking tape layer, and then forming an armor layer by wrapping a double-layer galvanized steel tape;
(4) And extruding the compact medium-density polyethylene material outer sheath material on the armor layer by an extruder and an extrusion die by adopting an extrusion process to form the outer sheath layer.
CN202211356517.5A 2022-11-01 2022-11-01 Longitudinal and radial water-blocking cable and manufacturing method thereof Pending CN115579179A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211356517.5A CN115579179A (en) 2022-11-01 2022-11-01 Longitudinal and radial water-blocking cable and manufacturing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211356517.5A CN115579179A (en) 2022-11-01 2022-11-01 Longitudinal and radial water-blocking cable and manufacturing method thereof

Publications (1)

Publication Number Publication Date
CN115579179A true CN115579179A (en) 2023-01-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211356517.5A Pending CN115579179A (en) 2022-11-01 2022-11-01 Longitudinal and radial water-blocking cable and manufacturing method thereof

Country Status (1)

Country Link
CN (1) CN115579179A (en)

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