CN114133681A - Preparation method of outer layer of communication cable - Google Patents
Preparation method of outer layer of communication cable Download PDFInfo
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- CN114133681A CN114133681A CN202111473637.9A CN202111473637A CN114133681A CN 114133681 A CN114133681 A CN 114133681A CN 202111473637 A CN202111473637 A CN 202111473637A CN 114133681 A CN114133681 A CN 114133681A
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- 238000004891 communication Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000010410 layer Substances 0.000 claims abstract description 56
- 239000011247 coating layer Substances 0.000 claims abstract description 24
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 22
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 22
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 18
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 238000001125 extrusion Methods 0.000 claims abstract description 14
- 239000004014 plasticizer Substances 0.000 claims abstract description 12
- 239000006057 Non-nutritive feed additive Substances 0.000 claims abstract description 11
- 229920002367 Polyisobutene Polymers 0.000 claims abstract description 11
- 239000004743 Polypropylene Substances 0.000 claims abstract description 11
- 229920001485 poly(butyl acrylate) polymer Polymers 0.000 claims abstract description 11
- -1 polypropylene Polymers 0.000 claims abstract description 11
- 229920001155 polypropylene Polymers 0.000 claims abstract description 11
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 10
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 8
- 238000004898 kneading Methods 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 24
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- PRWJPWSKLXYEPD-UHFFFAOYSA-N 4-[4,4-bis(5-tert-butyl-4-hydroxy-2-methylphenyl)butan-2-yl]-2-tert-butyl-5-methylphenol Chemical group C=1C(C(C)(C)C)=C(O)C=C(C)C=1C(C)CC(C=1C(=CC(O)=C(C=1)C(C)(C)C)C)C1=CC(C(C)(C)C)=C(O)C=C1C PRWJPWSKLXYEPD-UHFFFAOYSA-N 0.000 claims description 2
- VOWAEIGWURALJQ-UHFFFAOYSA-N Dicyclohexyl phthalate Chemical group C=1C=CC=C(C(=O)OC2CCCCC2)C=1C(=O)OC1CCCCC1 VOWAEIGWURALJQ-UHFFFAOYSA-N 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 229920001610 polycaprolactone Polymers 0.000 claims description 2
- 239000004632 polycaprolactone Substances 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 13
- 230000008569 process Effects 0.000 description 9
- 230000002195 synergetic effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000005469 granulation Methods 0.000 description 6
- 230000003179 granulation Effects 0.000 description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 4
- 239000003063 flame retardant Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Organic Insulating Materials (AREA)
- Insulated Conductors (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to a preparation method of an outer coating layer of a communication cable, wherein the outer coating layer is prepared from the following raw materials in parts by mass: 80-90 parts of polyvinyl chloride, 5-10 parts of polypropylene, 5-10 parts of polyisobutylene, 5-10 parts of poly (butyl acrylate), 8-20 parts of plasticizer, 1-5 parts of antioxidant and 1-5 parts of processing aid. The preparation method comprises the following steps: step one, adding polyvinyl chloride, polypropylene, polyisobutylene and poly (butyl acrylate) into a high-speed mixer, and stirring to obtain a mixture A; adding the mixture A, a plasticizer, an antioxidant and a processing aid into a high-temperature vacuum kneading machine for kneading to obtain a mixture B; thirdly, putting the mixture B into a double-screw extruder for melt extrusion, and granulating and drying to obtain a master batch; and step five, after the core wire is subjected to vacuum treatment, extruding the master batch through a double-screw extruder and the core wire to form a tegument layer in a vacuum environment.
Description
Technical Field
The invention relates to the field of cable manufacturing, in particular to a preparation method of an outer layer of a communication cable.
Background
The outermost layer of the communication cable is generally an outer layer, the outer layer is made of a high polymer material, and the outer layer is coated on a metal shielding layer (such as an aluminum foil layer) or an insulating layer of the communication cable by a method such as high-temperature extrusion. At present, the main materials used for preparing the outer coating material of the communication cable at home and abroad are two: one is PVC (polyvinyl chloride), and the other is TPE (TPE is a material having the characteristics of high elasticity, high strength, high resilience, and injection processability of rubber) as a representative low-smoke halogen-free material.
The cost of TPE is 2-3 times higher than that of PVC, and TPE belongs to flammable materials, has larger flame and has dripping property during combustion. The specific gravity of TPE is small (rho < 1.0 g/cm)3) And a flame retardant having a large specific gravity (rho > 2.0 g/cm)3) When the flame retardant TPE material is mixed, the flame retardant performance is unstable due to poor dispersibility caused by large specific gravity difference, and the cost of the flame retardant TPE material is more expensive.
Polyvinyl chloride is an amorphous linear, noncrystalline polymer with essentially no branching and regular chain segment arrangement. The number of degrees of polymerization n is generally 500-. The polyvinyl chloride resin is white powder and has a relative density of about 1.4. The outer layer prepared from the polyvinyl chloride has high mechanical strength, good chemical stability and acid and alkali resistance. However, the technical problems of using polyvinyl chloride to prepare the outer layer are as follows: insufficient softness, poor surface extinction performance, low-temperature brittleness, easy aging and degradation, easy migration of plasticizer and insufficient oxygen resistance.
The technical problems existing in the preparation of the outer layer of the communication cable at present are as follows:
1. when the outer tegument layer is extruded, the structure of the outer tegument layer is asymmetric and the thickness is uneven due to the problems of a mould and the like;
2. the outer surface of the insulating layer of the core wire is rough and has small uneven bumps, and when the outer surface of the insulating layer of the core wire is extruded by the outer coating layer, the outer coating layer cannot well fill asymmetric bumps on the outer surface of the insulating layer due to the existence of air, so that the structure of the outer coating layer is asymmetric and the thickness of the outer coating layer is uneven;
3. when the outer layer has an asymmetric structure and a non-uniform thickness, the electrical characteristics of the communication cable, particularly the characteristics such as attenuation and SCD21, are affected.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a preparation method of a tegument layer of a communication cable, which improves the preparation process and the raw material component parameters for preparing the tegument layer, and realizes the structural symmetry and uniform thickness of the tegument layer through the improved synergistic effect of the two aspects.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for preparing the outer layer of communication cable. In the present invention, the outer layer of the communication cable is made of the following raw materials in parts by mass: 80-90 parts of polyvinyl chloride, 5-10 parts of polypropylene, 5-10 parts of polyisobutylene, 5-10 parts of poly (butyl acrylate), 8-20 parts of plasticizer, 1-5 parts of antioxidant and 1-5 parts of processing aid.
Wherein, the polyvinyl chloride adopts the polyvinyl chloride resin powder with the molecular weight of 1000-1800, the K value of 60-80 and the polymerization degree of 1200-1500.
Preferably, the plasticizer is dicyclohexyl phthalate.
Preferably, the antioxidant is 1,1, 3-tris (5-tert-butyl-4-hydroxy-2-methylphenyl) butane.
Preferably, the processing aid is poly (ethylene oxide) -block-polycaprolactone.
The preparation method of the outer layer of the communication cable provided by the invention comprises the following steps:
step one, preparing raw materials according to the mass parts;
secondly, adding polyvinyl chloride, polypropylene, polyisobutylene and poly (butyl acrylate) into a high-speed mixer, and stirring at the temperature of 50-60 ℃ and the stirring speed of 1500-2000r/min for not less than 25min to obtain a mixture A;
step three, adding the mixture A, the plasticizer, the antioxidant and the processing aid into a high-temperature vacuum kneader, and kneading at the temperature of 200-;
putting the mixture B into a double-screw extruder, performing melt extrusion under the condition of high temperature, and performing granulation and drying to obtain a master batch;
and step five, after the core wire is subjected to vacuum treatment, extruding the master batch through a double-screw extruder and the core wire to form the communication cable with the outer coating layer in a vacuum environment.
Preferably, in the fourth step, the length-diameter ratio of the screw of the twin-screw extruder is 40-50:1, and the temperatures of each section and the head of the twin-screw extruder during extrusion granulation are respectively as follows: the feeding section is 130-. The residence time of the whole extrusion process is 1-3min during extrusion granulation, and the die head pressure is 10-30 MPa.
Preferably, in the fifth step, the vacuum degree of the vacuum environment is-0.05 MPa.
Preferably, in the fifth step, the length-diameter ratio of the twin-screw extruder is not less than 55, the diameter of the screw is 40-45mm, the extrusion speed and the drawing speed of the cable are 45-55m/min, and the temperatures of each section and the head in the twin-screw extruder are respectively as follows: the feeding section is 150 ℃ to 160 ℃, the conveying section is 160 ℃ to 190 ℃, the melting section is 200 ℃ to 230 ℃, and the head is 185 ℃ to 225 ℃. The communication cable forming the outer layer is eventually taken up on the take-up spool.
Compared with the prior art, the technical scheme provided by the invention has at least the following beneficial effects:
1. the inventor finds that if the structure of the outer layer coated on the core wire is symmetrical and the thickness is uniform, the following requirements are simultaneously met: the core wire is coated by the outer coating layer, a gas layer does not exist between the master batch and the outer side wall of the core wire, the master batch in a molten or semi-molten state has excellent fluidity, and the outer coating layer has excellent adhesion with the outer side wall of the core wire. In order to meet the three requirements, the inventor improves the preparation process and also needs to improve the raw material component parameters for preparing the outer coating layer, and more specifically, the outer coating layer coated on the core wire has symmetrical structure and uniform thickness through the synergistic effect of three factors of vacuum treatment on the core wire, vacuum environment in the process of coating the core wire by the outer coating layer and control of the raw material component parameters of the outer coating layer;
2. the processing performance of the outer tegument layer is improved by reasonably selecting the components of the outer tegument layer, and more specifically, the master batch for preparing the outer tegument layer has excellent fluidity in a molten or semi-molten state and can be uniformly coated on the outer side wall of the core wire, which is realized through the synergistic action among polyvinyl chloride, polypropylene, polyisobutylene and poly (butyl acrylate), and the viscosity of the master batch is adjusted in the molten or semi-molten state through the synergistic action of the polyvinyl chloride, the polypropylene, the polyisobutylene and the poly (butyl acrylate), so that the fluidity of the master batch in the molten or semi-molten state is effectively improved, and the mechanical strength of the outer tegument layer is ensured to meet the requirement;
3. the plasticizer is added in the components for preparing the outer coating layer, so that the glass transition temperature of the master batch is reduced, namely the outer coating layer becomes softer and has good toughness at normal temperature; the anti-aging performance of the outer tegument layer is improved by adding the antioxidant in the components for preparing the outer tegument layer; by adding the processing aid in the components for preparing the outer covering layer, the processing aid and the plasticizer can play a synergistic effect to obviously improve the bending resistance of the outer covering layer.
4. Before the tegument cladding heart yearn, the heart yearn carries out vacuum treatment earlier, and the vacuum pump can suck the adnexed gaseous layer of small unsmooth department on the lateral wall of heart yearn this moment to the process of tegument cladding heart yearn is in can further get rid of the gaseous layer between the lateral wall of masterbatch and heart yearn in vacuum environment, will closely laminate together between the lateral wall of masterbatch under the melting or semi-molten state this moment and heart yearn, then form the tegument through the cooling, this tegument structural symmetry and thickness are even.
The invention is further described with reference to the following detailed description and accompanying drawings.
Drawings
The figures further illustrate the invention, but the examples in the figures do not constitute any limitation of the invention.
Fig. 1 is a schematic view of an outer layer coated core wire according to an embodiment of the present invention.
Wherein the reference numerals are: 11. a vacuum pump; 12. an air tube; 2. a cavity; 3. a core wire; 4. a double screw extruder; 5. a communication cable.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The components and parts by mass of the outer layers used for preparing the communication cables in examples 1 to 3 are shown in table 1 below.
TABLE 1
Example 4
The embodiment provides a preparation method of a tegument layer of a communication cable, which comprises the following steps:
step one, preparing raw materials according to the components and parts by mass described in example 3;
secondly, adding polyvinyl chloride, polypropylene, polyisobutylene and poly (butyl acrylate) into a high-speed mixer, and stirring at the temperature of 50-60 ℃ and the stirring speed of 1500-2000r/min for not less than 25min to obtain a mixture A;
step three, adding the mixture A, the plasticizer, the antioxidant and the processing aid into a high-temperature vacuum kneader, and kneading at the rotation speed of 200-300 ℃ and the stirring speed of 1500-3000r/min for not less than 30min to obtain a mixture B;
and step four, placing the mixture B in a double-screw extruder, performing melt extrusion under a high temperature condition, granulating and drying to obtain a master batch, wherein the length-diameter ratio of screws of the double-screw extruder is 48:1, and the temperatures of each section and a machine head in the double-screw extruder during extrusion granulation are respectively as follows: the feeding section is 145 ℃, the conveying section is 170 ℃, the melting section is 210 ℃ and the machine head is 200 ℃; vacuumizing and exhausting the tail end of the double-screw extruder during extrusion granulation, wherein the exhaust vacuum degree is-0.07 MPa, the residence time of the whole extrusion process during extrusion granulation is 2min, and the die head pressure is 20 MPa;
step five, as shown in fig. 1, before entering the twin-screw extruder 4, the core wire 3 firstly passes through the cavity 2, the cavity 2 is connected with the vacuum pump 11 through the air pipe 12, and the inside of the cavity 2 is in a vacuum state, so the core wire 3 firstly performs vacuum treatment when entering the cavity 2 and then enters the twin-screw extruder 4, it should be noted that the process that the core wire 3 enters the twin-screw extruder 4 from the cavity 2 is also in a vacuum environment, and the process that the master batch is extruded by the twin-screw extruder 4 and the core wire 3 to form the communication cable 5 with an outer coating layer is also performed in a vacuum environment, namely the process that the core wire 3 enters the cavity 2 and the communication cable 5 leaves the twin-screw extruder is performed in a vacuum environment. The length-diameter ratio of the double-screw extruder is 55: 1, the diameter of a screw is 45mm, the extrusion speed and the traction speed of a cable are 50m/min, and the temperature of each section and a machine head in a double-screw extruder are respectively as follows: 155 ℃ in the feeding section, 170 ℃ in the conveying section, 210 ℃ in the melting section and 200 ℃ in the head.
The components and parts by mass of the outer layers used for preparing the communication cables in comparative examples 1 to 3 are shown in table 2 below.
TABLE 2
Comparative example 4
This example provides a method for preparing the outer layer of a communication cable, which differs from the method provided in example 4 only in that: the composition parameters of the outer layer in the preparation method provided by the present embodiment are as described in comparative example 1.
Comparative example 5
This example provides a method for preparing the outer layer of a communication cable, which differs from the method provided in example 4 only in that: the composition parameters of the outer layer in the preparation method provided by the present embodiment are as described in comparative example 2.
Comparative example 6
This example provides a method for preparing the outer layer of a communication cable, which differs from the method provided in example 4 only in that: the composition parameters of the outer layer in the preparation method provided by the present embodiment are as described in comparative example 3.
Comparative example 7
This example provides a method for preparing the outer layer of a communication cable, which differs from the method provided in example 4 only in that: in the preparation method provided by the embodiment, the process that the core wire is not subjected to vacuum treatment and the master batch is extruded by the double-screw extruder and the core wire to form the communication cable with the outer coating layer is carried out in the atmospheric environment.
The communication cable with the outer layer provided in example 4 of the present invention and the communication cables with the outer layers provided in comparative examples 4 to 7 were tested, specifically, 10 different portions of the communication cable with the outer layer were taken, the thickness of the outer layer of the portion was tested to obtain the thickness range of the outer layer, and the tensile strength of the outer layer of the portion was simultaneously tested and averaged, and the test results are shown in table 3.
TABLE 3
| Test items | Example 4 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7 | According to the standard |
| Thickness range (μm) | 80±1 | 80±10 | 80±8 | 80±7 | 80±10 | ASTM D-374 |
| Tensile Strength (MPa) | 75.8 | 51.4 | 55.2 | 52.1 | 74.2 | ASTM D-882 |
As can be seen from the test results in table 3, the synergistic effects of the three factors of vacuum treatment of the core wire, control of the raw material component parameters of the outer coating layer under the vacuum environment in the process of coating the core wire with the outer coating layer realize the structural symmetry and uniform thickness of the outer coating layer coated on the core wire, the synergistic effect of polyvinyl chloride, polypropylene, polyisobutylene and poly (butyl acrylate) realizes excellent fluidity of the master batch in a molten or semi-molten state and excellent adhesion with the core wire, so that the thickness of the outer coating layer is uniform, and the synergistic effect of polyvinyl chloride, polypropylene, polyisobutylene and poly (butyl acrylate) realizes the significant improvement of the mechanical properties of the outer coating layer.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A method for preparing the outer layer of communication cable is characterized in that,
the outer coating layer is prepared from the following raw materials in parts by mass: 80-90 parts of polyvinyl chloride, 5-10 parts of polypropylene, 5-10 parts of polyisobutylene, 5-10 parts of poly (butyl acrylate), 8-20 parts of plasticizer, 1-5 parts of antioxidant and 1-5 parts of processing aid;
the preparation method comprises the following steps:
step one, adding the polyvinyl chloride, the polypropylene, the polyisobutylene and the poly (butyl acrylate) into a high-speed mixer, and stirring at the temperature of 50-60 ℃ and the stirring speed of 1500-2000r/min for not less than 25min to obtain a mixture A;
step two, adding the mixture A, the plasticizer, the antioxidant and the processing aid into a high-temperature vacuum kneader, and kneading at the rotation speed of 200-300 ℃ and the stirring speed of 1500-3000r/min for not less than 30min to obtain a mixture B;
thirdly, putting the mixture B into a double-screw extruder for melt extrusion, and granulating and drying to obtain a master batch; and step five, after the core wire is subjected to vacuum treatment, extruding the master batch through a double-screw extruder and the core wire to form the outer coating layer in a vacuum environment.
2. The method of claim 1, wherein: the polyvinyl chloride adopts the polyvinyl chloride resin powder with the molecular weight of 1000-1800, the K value of 60-80 and the polymerization degree of 1200-1500.
3. The method of claim 1, wherein: the plasticizer is dicyclohexyl phthalate.
4. The method of claim 1, wherein: the antioxidant is 1,1, 3-tri (5-tert-butyl-4-hydroxy-2-methylphenyl) butane.
5. The method of claim 1, wherein: the processing aid is poly (ethylene oxide) -block-polycaprolactone.
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2021
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