CN114381085A - Ultralow-friction-coefficient central tube type air-blowing micro cable and preparation method of sheath thereof - Google Patents
Ultralow-friction-coefficient central tube type air-blowing micro cable and preparation method of sheath thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title description 6
- 239000000463 material Substances 0.000 claims abstract description 32
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 25
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 24
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 24
- 229920006324 polyoxymethylene Polymers 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 15
- 239000013307 optical fiber Substances 0.000 claims abstract description 15
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims abstract description 13
- 238000004891 communication Methods 0.000 claims abstract description 11
- 239000006096 absorbing agent Substances 0.000 claims abstract description 10
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- 238000002156 mixing Methods 0.000 claims description 14
- 230000003287 optical effect Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 11
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- 235000013824 polyphenols Nutrition 0.000 claims description 4
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 claims description 4
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- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical group COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
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- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
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- 239000001301 oxygen Substances 0.000 description 1
- -1 polyoxymethylene Polymers 0.000 description 1
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
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- C08K5/14—Peroxides
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/15—Heterocyclic compounds having oxygen in the ring
- C08K5/151—Heterocyclic compounds having oxygen in the ring having one oxygen atom in the ring
- C08K5/1535—Five-membered rings
- C08K5/1539—Cyclic anhydrides
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/4438—Means specially adapted for strengthening or protecting the cables for facilitating insertion by fluid drag in ducts or capillaries
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
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Abstract
The invention discloses an ultralow-friction-coefficient central-tube type air-blowing micro cable which comprises a sheath, wherein a mixture for preparing the sheath mainly comprises 85-95 parts by mass of polyformaldehyde and 3-13 parts by mass of molybdenum disulfide, a compatilizer, an antioxidant, an aldehyde absorbing agent and a light shielding agent. The sheath is made of materials such as polyformaldehyde, molybdenum disulfide, a compatilizer, an antioxidant and an aldehyde absorbing agent, so that the surface friction coefficient of the central tube type air-blowing micro-cable is greatly reduced, the fluctuation range of the air-blowing friction coefficient is very narrow, and the air-blowing distance and the construction efficiency of the product can be greatly improved. The invention has stable environment resistance, especially in low temperature environment, basically no change of optical fiber attenuation, and ensures the stable transmission performance of the optical fiber. The invention can be laid in plastic air-blowing microtubes for communication with the diameter of 5/3.5mm or even smaller by air-blowing in a larger distance, and the problems of air-blowing effect and construction efficiency of customers are met.
Description
Technical Field
The invention belongs to the field of optical cables, and particularly relates to an ultralow-friction-coefficient central tube type air-blowing micro cable and a preparation method of a sheath thereof.
Background
The air-blown optical cable laying technology is widely applied to the 5G network construction process at home and abroad at present due to construction standardization, mechanization and high efficiency, particularly in the FTTH network construction process, a communication air-blown plastic micro-tube used by a pipeline operator is a bundling tube with the diameter of 5/3.5mm (the outer diameter is 5mm, and the inner diameter is 3.5mm), and air-blown optical cable products used in the pipeline almost all use air-blown optical fiber units with the diameter of less than 1.6mm, so that the production of the air-blown optical fiber units is limited by various factors such as equipment, materials, production processes, patent limitations and the like, and domestic manufacturers cannot provide corresponding products at present.
The loose tube is used as a basic unit of the optical cable, is not limited by patents, has simple structure, quick processing, low cost and convenient use, is used as a basic unit to produce the central tube type air-blowing micro cable, and is most likely to be applied to the specification of a micro tube with the diameter of 5/3.5 mm.
The problems encountered in the actual development process at present are: 1) the diameter of the central tube type air-blowing micro-cable structure is relatively large, the duty ratio (the area of the outer edge of the cross section of the micro-cable/the area of the inner edge of the cross section of the micro-tube) is higher in a micro-tube with the specification of 5/3.5mm, and the air-blowing effect is influenced; 2) the central tube type air-blowing micro-cable sheath is completely made of high-density polyethylene (HDPE), the friction coefficient of the central tube type air-blowing micro-cable sheath is from 0.12 to 0.35, the central tube type air-blowing micro-cable sheath is mainly related to the grade and the processing technology of sheath materials selected by various manufacturers, and under the condition of high duty ratio, the better air-blowing effect is difficult to achieve by using the friction coefficient, so that the central tube type air-blowing micro-cable with some structures is difficult to make up for the defect of the friction coefficient, and a plurality of air flow channels are arranged on the surface of the sheath, so that the friction coefficient of a product can be objectively reduced, but in the actual air-blowing application, the air-blowing effect is not greatly improved due to the abrasion of the surface material of the sheath and the adhesion of high-temperature and high-pressure materials, so that the large breakthrough is difficult to meet the requirements of long-distance air-blowing and high-efficiency construction of customers, and the engineering progress can be influenced under the conditions of complicated construction routes and poor quality of pipelines; 3) when HDPE (high-density polyethylene) is used as a sheath material and the HDPE material is used as the same material of the air-blowing microtube to rub, the fluctuation range of the friction coefficient is very large, which reflects that the air-blowing speed is unstable in the air-blowing effect and influences the air-blowing construction safety 4) the environmental resistance of the optical cable is poor, and the contraction and the extension of the HDPE sheath caused by the change of the environmental temperature can cause the deterioration of the optical fiber transmission performance of the laid cable due to the contraction and the extension of the sheath caused by the change of high and low temperature.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a preparation method of an ultralow-friction-coefficient central-tube type air-blowing micro cable and a sheath thereof, which can be applied to long-distance air-blowing laying in a 5/3.5mm micro tube and have the remarkable advantages of extremely low friction coefficient of a product, narrow fluctuation range of the friction coefficient, excellent high and low temperature environment resistance, simple structure of the product, low manufacturing cost and the like.
In order to achieve the above object, according to one aspect of the present invention, there is provided an ultra-low friction coefficient central tube type air-blown micro-cable comprising a sheath, wherein a mixture from which the sheath of the optical cable is made mainly comprises polyoxymethylene, molybdenum disulfide, a compatibilizer, an antioxidant, an aldehyde-adsorbing agent and a light-shielding agent;
in the mixture, the mass parts of polyformaldehyde are 85-95 parts, and the mass parts of molybdenum disulfide are 3-13 parts.
Preferably, the friction coefficient of the sheath relative to the 5/3.5mm specification blown plastic micro-pipe for communication is lower than 0.1, and the material of the 5/3.5mm specification blown plastic micro-pipe for communication is HDPE.
Preferably, the outer diameter of the sheath is 1.6mm to 2.6 mm.
Preferably, the fluctuation amplitude of the sheath of the air-blown micro cable in the friction coefficient test process is less than 0.01 relative to a 5/3.5mm specification air-blown plastic micro pipe for communication.
Preferably, the compatilizer is 0.05 to 0.2 part by mass, the antioxidant is 0.05 to 0.2 part by mass, the aldehyde absorbing agent is 0.03 to 0.1 part by mass, and the light shielding agent is 2 to 3 parts by mass.
Preferably, the antioxidant is one or more of polyphenol hindered phenol antioxidant, phosphorous acid antioxidant and hindered amine.
Preferably, the light-shielding agent is conductive carbon black or hindered amine
Preferably, the optical fiber bundle in the single loose tube in the sheath of the air-blown micro-cable comprises 2-24 optical fibers.
Preferably, aramid yarns are bound on the loose tubes in the sheath to serve as reinforced tensile elements.
According to another aspect of the present invention, there is also provided a method for preparing a sheath of the ultra-low friction coefficient central tube type air-blown micro-cable, comprising the steps of:
1) putting polyformaldehyde and molybdenum disulfide into a mixing kettle of a high-speed mixer, uniformly mixing, then adding a compatilizer, an antioxidant, an aldehyde absorbing agent and a light shielding agent, and uniformly mixing to form a mixture;
in the mixture, the mass parts of polyformaldehyde are 85-95 parts, and the mass parts of molybdenum disulfide are 3-13 parts;
2) mixing the mixture in a double-screw extruder, and then sequentially carrying out extrusion, cooling, granulation and drying to obtain the sheath material, wherein the extrusion temperature of the double-screw extruder is 180-190 ℃;
3) the jacket material is extruded through an extruder to form the jacket.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1) one of the base materials used in the invention is polyformaldehyde, has hardness, strength and rigidity similar to metals, has better wear resistance, can be used for a long time at the temperature of minus 40 ℃ to 100 ℃, has good self-lubricating property and good fatigue resistance under wide temperature and humidity conditions, has a friction coefficient of a pure material larger than HDPE, and has an extremely low friction coefficient under the lubrication condition (for example, the friction coefficient can reach 0.012 to 0.018 under the lubrication condition); the second base material is 2H crystal type molybdenum disulfide with special layer structure and the layers are connected with each other by tiny molecular force. Molybdenum disulfide is separated from layer to layer easily, consequently has good lubricating property, is honored as high-grade solid lubricating oil, mixes under lower proportion, and molybdenum disulfide forms the interfacial lubrication film between micro cable sheath surface and microtubule, makes the friction part between sheath surface and the microtubule convert into intermolecular and slides, plays and reduces sheath surface friction coefficient and improves the effect of sheath stand wear and tear ability.
2) The sheath is made of materials such as polyformaldehyde, molybdenum disulfide, a compatilizer, an antioxidant and an aldehyde absorbing agent, so that the surface friction coefficient of the central tube type air-blowing micro-cable is greatly reduced, the air-blowing distance of the micro-cable product can be greatly increased, the construction efficiency is improved, and the construction cost is reduced.
3) Compared with the friction coefficient of an air-blown plastic micro-tube with 5/3.5 specification for industrial general communication, the central tube type air-blown micro-cable sheath has the advantages that the fluctuation range of the friction coefficient is smaller than 0.01 in the test process, almost a straight line is formed, and the fluctuation range of the friction coefficient is far smaller than that of an HDPE sheath material. The blowing speed is stable and orderly, the condition of suddenly fast and suddenly slow can not occur, and the construction safety is ensured.
4) The optical cable provided by the invention has stable environment resistance, and the attenuation of the optical fiber is basically unchanged when the optical cable is used in a low-temperature (-40 ℃) environment, so that the stability of the transmission performance of the optical fiber is ensured.
5) The invention can be laid in the 5/3.5mm or smaller communication air-blowing plastic micro-pipe by air-blowing at a larger distance, and meets the air-blowing effect and the construction efficiency of customers.
Drawings
FIG. 1 is a schematic view of an ultra-low coefficient of friction center tube air-blown micro-cable of the present invention;
FIG. 2 is a graph showing the fluctuation of the results of the friction coefficient test performed on the center tube type air-blown micro-cables produced in comparative examples 1 and 2 and example 2 in the same 5/3.5mm air-blown micro-tube.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention relates to an ultralow-friction-coefficient central-tube type air-blowing micro-cable, which comprises a sheath 4 and loose tubes 2 coated in the sheath 4, wherein optical fiber bundles 1 are distributed in the loose tubes 2, each optical fiber bundle 1 in each loose tube 2 is provided with 2-24 colored optical fibers 1, and the loose tubes 2 contain fiber paste to enable the optical fibers to be in a free state; the sheath 4 is mainly formed by blending and extruding materials such as polyformaldehyde, molybdenum disulfide, a compatilizer, an antioxidant and an aldehyde absorbing agent, a reinforced tensile member 3 can be arranged between the sheath 4 and the loose tube 2, and the reinforced tensile member 3 is preferably aramid yarn.
The sheath 4 is mainly prepared from the following base materials in parts by mass: 85-95 parts of polyformaldehyde, 3-13 parts of molybdenum disulfide, 0.05-0.2 part of compatilizer, 0.05-0.2 part of antioxidant, 0.03-0.1 part of aldehyde absorbent and 2-3 parts of light shielding agent.
The friction coefficient of the ultralow-friction-coefficient central tube type air-blown micro-cable is less than 0.1, preferably less than 0.05 relative to a common 5/3.5mm (5 mm in outer diameter and 3.5mm in inner diameter) specification air-blown plastic micro-tube for communication in the industry.
The polyformaldehyde is preferably copolyformaldehyde, which has much better thermal stability than homopolyformaldehyde.
The molybdenum disulfide preferably adopts solid powder obtained by chemically purifying natural molybdenum concentrate powder, and plays roles in reducing the surface friction coefficient of the sheath 4 and improving the wear resistance of the sheath 4, particularly under high temperature and high pressure, the wear resistance and the friction coefficient of the sheath 4 are slightly different according to different addition proportions.
The antioxidant is one or more of polyphenol hindered phenol antioxidant, phosphorous acid antioxidant and high molecular weight hindered amine, preferably the mixture comprises the three components of 0.01 part of polyphenol hindered phenol antioxidant, 0.03 part of phosphorous acid antioxidant and 0.04 part of high molecular weight hindered amine in parts by mass, and the use effect is good.
The light shielding agent is carbon black, and preferably nano conductive carbon black, so that the light resistance and weather resistance of the sheath can be greatly improved, the sheath can have antistatic property, the electrostatic adsorption resistance generated by friction among plastics in the air blowing process is eliminated, and the air blowing construction is facilitated.
The compatilizer is preferably a mixture of Maleic Anhydride (MAH) and 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane (commonly known as bis-dipenta-vulcanizing agent), and the mass part ratio of the Maleic Anhydride (MAH) to the bis-dipenta-vulcanizing agent is (1-2): (0.5-1), preferably 2:1, so as to ensure that the molybdenum disulfide and each additive are well compatible with the polyformaldehyde, and the molybdenum disulfide and the polyformaldehyde can play a role in linking molecules on an interface, namely a compatibility role.
The aldehyde absorbent is preferably formic acid absorbent, and mainly inhibits the generation of formaldehyde gas during the extrusion process. In the production, processing and granulation processes, under the influence of oxygen and high temperature, hydroxyl at the terminal of polyformaldehyde is broken and separated into formic acid, and the formic acid can promote polyformaldehyde to be continuously decomposed, so that vicious circle is caused.
One of the base materials consisting of the sheath 4 with low friction coefficient is polyformaldehyde, which is widely used for manufacturing various sliding and rotating mechanical parts, almost no report is available for optical cable sheath materials, but the base material has the hardness, the strength and the rigidity similar to metals, has better wear resistance, can be used for a long time at the temperature of minus 40 ℃ to 100 ℃, has good self-lubricating property and good fatigue resistance under the conditions of wide temperature and humidity, has higher friction coefficient than HDPE (for example, the friction coefficient can reach 0.012 to 0.018 under the condition of lubrication) and has very low friction coefficient under the condition of lubrication; the second base material is molybdenum disulfide which is generally used as a solid lubricant, the molybdenum disulfide is in a 2H crystal form and has a special layered structure, and all the layers are mutually connected by extremely tiny molecular force. Molybdenum disulfide is separated from layer to layer easily, consequently has good lubricating property, is honored as high-grade solid lubricating oil, mixes under lower proportion, and molybdenum disulfide forms interfacial lubrication film between micro cable sheath surface and microtubule, makes the friction part between sheath surface and microtubule convert into intermolecular and slides, plays and reduces sheath surface coefficient of friction and improves the effect of sheath stand wear and tear ability
The polyformaldehyde and the molybdenum disulfide are used as base materials and are supplemented with a compatilizer, an antioxidant, an aldehyde absorbing agent and a light shielding agent, so that the heat resistance, the light resistance, the aging resistance, the low-temperature shrinkage resistance and other related properties of the sheath 4 can be obviously improved, the electrostatic adsorption in the air blowing process can be eliminated, the comprehensive performance of an optical cable product is excellent, the air blowing performance and the temperature environment change resistance of the product are greatly superior to those of the optical cable with the traditional HDPE sheath, and the development and application requirements of the air blowing product in a 5/3.5mm microtube can be well met.
The central tube type air-blowing micro cable with the low friction coefficient abandons the traditional sheath 4 which has the minimum friction coefficient and is not stable and adopts HDPE material, develops the sheath 4 with the low friction coefficient and is suitable for the extrusion processing of the optical cable, and the sheath 4 has the advantages of extremely low friction coefficient, high strength, high hardness and strong wear resistance. When the air-blowing micro cable is blown in the plastic pipeline, the influence of electrostatic adsorption on the air-blowing performance can be avoided due to good electrical conductivity.
The preparation process of the sheath 4 of the low-friction-coefficient central tube type air-blowing micro cable suitable for optical cable extrusion processing comprises the following steps:
1) putting polyformaldehyde and molybdenum disulfide into a mixing kettle of a high-speed mixer, uniformly mixing, wherein the polyformaldehyde is added from a main material port, the molybdenum disulfide is added from a side port, uniformly mixing is carried out at a low speed for a set time, and then adding a compatilizer, an antioxidant, an aldehyde absorbing agent, a light shielding agent and uniformly mixing is carried out at a high speed for a set time to form a mixture;
2) mixing the mixture in a double-screw extruder, and then sequentially carrying out extrusion, cooling, granulation and drying to obtain the sheath material, wherein the extrusion temperature of the double-screw extruder is 180-190 ℃;
3) the jacket material is extruded through an extruder to form the jacket.
Wherein, the mass portion ratio and other technical parameters of the raw materials added in the step 1) are shown in the following table 1, namely example 1 to example 9.
The materials and preparation methods of the sheaths of comparative examples 1, 2 in table 1 employ existing conventional techniques.
The manufacturing process of the sheaths of comparative examples 3 and 4 in table 1 is substantially the same as that of examples 1 to 9 of the present invention, except that the ratio of the parts by mass of the raw materials in step 1) of comparative examples 3 and 4 is different.
TABLE 1 comparison table of raw material ratio, friction coefficient and blowing performance of sample examples and comparative examples
As can be seen from the samples No. 4#/7#/10#/12#/13# in table 1, the friction coefficients of the two types of sheaths 4 of the examples and the comparative examples are substantially different by one order of magnitude, and the surface friction coefficient can be suitably improved by adding molybdenum disulfide in different proportions, and when the addition amount is increased to a certain proportion, the friction coefficient is not continuously decreased but is increased again.
It can be seen from the examples of the 3#/4#/5# samples in Table 1 that the amount of the auxiliary added in the given range has a slight influence on the friction coefficient.
The center tube type air-blown micro-cables produced in comparative example 1, comparative example 2 (sample # 1/2), and example 2 (sample # 4) were subjected to a friction coefficient test in the same 5/3.5mm air-blown micro-tube, and the results are shown in fig. 2.
As can be seen from figure 2, the air-blown micro-cable friction coefficient test of the 1# and 2# samples adopting the HDPE sheath has very large fluctuation amplitude, the fluctuation amplitude almost reaches more than 30%, and the friction coefficient of the air-blown micro-cable produced by adopting the sheath material is basically a smooth line. As can be seen from the comparative examples of the sample No. 1/13 in Table 1, the effect of the blowing distance is significantly better with the sheath of the present invention even in the case of the same friction coefficient (all 0.14), and thus the blowing work is very advantageous.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A central tube type air-blowing micro cable with an ultra-low friction coefficient comprises a sheath, and is characterized in that a mixture for preparing the optical cable sheath mainly comprises polyformaldehyde, molybdenum disulfide, a compatilizer, an antioxidant, an aldehyde absorbing agent and a light shielding agent;
in the mixture, the mass parts of polyformaldehyde are 85-95 parts, and the mass parts of molybdenum disulfide are 3-13 parts.
2. The ultra-low coefficient of friction central tube air-blown micro-cable of claim 1, wherein the coefficient of friction of the sheath with respect to the 5/3.5mm gauge air-blown micro tube for communication is less than 0.1, and the material of the 5/3.5mm gauge air-blown micro tube for communication is HDPE.
3. The ultra-low coefficient of friction center tube air-blown micro-cable of claim 2, wherein the jacket has an outer diameter of 1.6mm to 2.6 mm.
4. The ultra-low coefficient of friction center tube air-blown micro-cable of claim 1, wherein the sheath of the air-blown micro-cable fluctuates less than 0.01 in magnitude during the coefficient of friction test relative to a 5/3.5mm gauge air-blown micro-tube for communications.
5. The ultra-low friction coefficient central tube type air-blowing micro cable as claimed in claim 1, wherein the mass portion of the compatilizer is 0.05 to 0.2, the mass portion of the antioxidant is 0.05 to 0.2, the mass portion of the aldehyde absorbent is 0.03 to 0.1, and the mass portion of the light shielding agent is 2 to 3.
6. The ultra-low coefficient of friction central tube air-blown micro-cable of claim 1, wherein the antioxidant is one or more of a polyphenol hindered phenol antioxidant, a phosphorous acid antioxidant, and a hindered amine.
7. The ultra low coefficient of friction center tube air blown micro cable of claim 1, wherein the light shielding agent is a conductive carbon black or a hindered amine.
8. The ultra-low coefficient of friction center tube air-blown micro-cable of claim 1, wherein the optical fiber bundle in the single loose tube in the jacket of the air-blown micro-cable comprises 2-24 optical fibers.
9. The ultra-low coefficient of friction center tube air-blown micro-cable of claim 1, wherein aramid yarns are bound to the loose tube in the jacket as reinforcing tensile members.
10. A method for preparing a sheath of the ultralow-friction-coefficient central tube type air-blown micro-cable as claimed in any one of claims 1 to 9, comprising the following steps:
1) putting polyformaldehyde and molybdenum disulfide into a mixing kettle of a high-speed mixer, uniformly mixing, then adding a compatilizer, an antioxidant, an aldehyde absorbing agent and a light shielding agent, and uniformly mixing to form a mixture;
in the mixture, the mass parts of polyformaldehyde are 85-95 parts, and the mass parts of molybdenum disulfide are 3-13 parts;
2) mixing the mixture in a double-screw extruder, and then sequentially carrying out extrusion, cooling, granulation and drying to obtain the sheath material, wherein the extrusion temperature of the double-screw extruder is 180-190 ℃;
3) the jacket material is extruded through an extruder to form the jacket.
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