A reusable optical cable jacket and method of making the same

Abstract

The application discloses a reusable optical cable coating and a preparation method thereof, and relates to the technical field of optical cables.The polyester elastomer is fixed to modified aramid fiber by using supercritical carbon dioxide-heat treatment-cryogenic treatment; then, the elastomer / modified aramid fiber is woven into a fiber layer along the surface of an optical cable core; then, a foam buffer layer with uniform cells, good resilience and softness is formed by mold pressing and hot air foaming, so that the optical cable coating has compression resistance and buffering performance; finally, the surface of the buffer layer is etched by using an acid anhydride to form a spiral closed loop structure, so that the compression resistance of the optical cable coating is improved; wherein the modified aramid fiber is prepared from aramid fiber, amino pyridine, chloromethyl isonicotinoyl and cyano benzyl alcohol, so that the radiation resistance of the optical cable coating is effectively improved.The reusable optical cable coating prepared by the application has the effects of compression resistance and buffering and radiation resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical cable, in particular to a reusable optical cable coating and a preparation method thereof. BACKGROUND

[0002] With the rapid development of optoelectronic technology, optical communication and transmission have entered more and more fields, and optical cables have also entered more application fields, including aerospace. In the field of aerospace, due to the special use environment, it is often required to have space anti-radiation performance, but the existing optical cable coating is easy to peel off after being irradiated, which exposes the optical cable core and affects the use of the optical cable.

[0003] In addition, the optical cable coating is the outer layer of the core and mainly provides a reflecting surface or optical isolation, but the protection of the core is weak. At present, the way to improve the pressure resistance of the optical cable is to adopt a multi-layer rigid or high-hardness structure layer to avoid damage to the core due to pressure. However, this way will greatly increase the specific gravity of the optical cable, which is not conducive to the laying and use of the optical cable, and most of them are full dense structures. When subjected to external forces, the external forces can still act on the core, causing damage to the optical cable. Therefore, how to prepare an optical cable coating with pressure resistance and radiation resistance is particularly important. SUMMARY

[0004] The present application aims to provide a reusable optical cable coating and a preparation method thereof to solve the problems in the prior art.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a reusable optical cable coating, characterized in that the optical cable coating is a double-layer composite structure, and from the inside to the outside, it is a fiber woven layer and a foam buffer layer; the fiber woven layer is woven from modified aramid fiber, and the foam buffer layer is foamed from polyester elastomer; the reusable optical cable coating mainly includes 50-70 parts of modified aramid fiber, 41-47 parts of polyester elastomer, and 4.1-14.1 parts of foaming agent by weight.

[0006] Further, the modified aramid fiber is prepared by cycloaddition reaction of amino pyridine, chloromethyl isonicotinoyl and cyanobenzyl alcohol, and then grafting on deprotonated aramid fiber to form a carbonyl amide compound.

[0007] Further, the polyester elastomer is a block copolymer with polybutylene terephthalate as a hard segment and polyethylene glycol ether as a soft segment.

[0008] Further, the foaming agent is one or more of azodicarbonamide, citric acid and sodium bicarbonate.

[0009] Further, a preparation method of a reusable optical cable cladding, characterized in that, mainly comprising the following preparation steps: modified aramid fiber preparation, supercritical carbon dioxide-heat treatment-cryogenic treatment to prepare polyester elastomer modified fiber, weaving, molding hot air foaming, etching.

[0010] Further, the preparation method of the reusable optical cable cladding comprises the following specific preparation steps:

[0011] (1) The amino pyridine, chloromethyl isonicotinaldehyde, cyanobenzyl alcohol and ethanol are stirred and mixed according to the mass ratio of 1:1.5:1.7:3.2-1:1.9:2.1:4.0, 0.07-0.2 times the mass of the amino pyridine is added to the sulfonated cyclodextrin, stirred at 80°C and 100-200 rpm for 5-6 h, then cooled to room temperature, filtered, concentrated at 0.1-0.5 MPa and 60°C for 60-75 min, then washed with ethyl acetate and n-hexane for 3-5 times, and dried at room temperature for 3-4 h to obtain a pyridine imidazole compound;

[0012] (2) The pyridine imidazole compound is dissolved in 4-5 times the mass of the pyridine imidazole compound in dichloroethane, stirred at 50-100 rpm for 15-23 min, 1.3-1.7 times the mass of the pyridine imidazole compound is added to the p-toluenesulfonic acid, stirred at the same speed for 27-39 min, then 3.8-4.3 times the mass of the pyridine imidazole compound is added to the iodobenzene acetate mixed solution at a rate of 0.3-0.5 mL / min, stirred at 70°C and 100-150 rpm for 6-7 h, then extracted and chromatographed with petroleum ether / ethyl acetate to obtain a carbon-based amide compound;

[0013] (3) The aramid fiber and 7-8 times the mass of the aramid fiber in dimethyl sulfoxide are placed in a container, heated to 30°C under nitrogen atmosphere, 0.016-0.025 times the mass of the aramid fiber is added to the sodium hydride, heated to 80-90°C, reacted for 1-2 h, then 3-4 times the mass of the aramid fiber is added to the carbon-based amide compound, reacted for 3-4 h, distilled at 0.1-0.3 MPa and 80°C for 85-94 min, washed with deionized water for 7-8 times, and dried at 70°C for 1-2.5 h to obtain a modified aramid fiber;

[0014] (4) adding the polyester elastomer into a container, heating and stirring at 150 DEG C and 300-400 rpm for 4-6 h, adding a foaming agent in an amount of 0.1-0.3 times the mass of the polyester elastomer, stirring at the same speed for 5-10 min, and then placing the container on the bottom of an autoclave; placing modified aramid fibers in an amount of 1.2-1.5 times the mass of the polyester elastomer on a wire mesh in the autoclave, treating at 70-85 DEG C and 13-15 MPa under a carbon dioxide atmosphere for 30-40 min, then increasing the temperature to 300-350 DEG C, maintaining the temperature for 10-14 min, cooling to room temperature, releasing the pressure at a rate of 0.3-0.9 MPa / min, then placing the container in a deep cooling treatment box, cooling to -80 DEG C, maintaining the temperature for 50-60 min, then cooling to -120 DEG C and maintaining the temperature for 60-69 min, then cooling to -196 DEG C and maintaining the temperature for 10-12 h, and then returning to room temperature to obtain polyester elastomer modified fibers;

[0015] (5) weaving the polyester elastomer modified fibers to a thickness of 0.1-0.3 mm along the surface of the cable core, placing the cable core in a flat curing machine, and molding and foaming at 120-130 DEG C and 10-14 MPa for 6-10 min, then placing the cable core in a hot air aging box and foaming at 170-180 DEG C for 6-11 min, then adding maleic anhydride in an amount of 0.2-0.4 times the mass of the polyester elastomer modified fibers, increasing the temperature to 90-95 DEG C, etching for 45-52 min, washing with 85 DEG C water for 5-7 times, and then drying at 70 DEG C for 8-10 h to obtain a reusable optical cable cladding layer.

[0016] Further, the iodine acetate mixed solution in step (2) is a mixture of iodine acetate and dichloroethane in a mass ratio of 1:2.1-1:3.0, and the petroleum ether / ethyl acetate is a mixture of petroleum ether and ethyl acetate in a volume ratio of 10:1.

[0017] Further, the cooling rate of the deep cooling treatment box in step (4) is 2-4 DEG C / min.

[0018] Further, in the weaving process in step (5), 30-35 polyester elastomer modified fibers are woven along a direction of 135 DEG -145 DEG, and 30-35 polyester elastomer modified fibers are woven along a direction of 35 DEG -45 DEG, and the weaving pitch is 25-29 mm.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The present application sequentially prepares a modified aramid fiber, a fiber woven layer, a buffer layer, and an etching layer to obtain an optical cable composite cladding layer, thereby achieving the effects of pressure resistance and radiation resistance.

[0021] Firstly, the polyester elastomer is fixed on the modified aramid fiber by supercritical carbon dioxide-heat treatment-cryogenic treatment; the supercritical carbon dioxide fluid is used as a reaction medium, and the polyester elastomer containing a foaming agent is carried into the modified aramid fiber, and then heat treatment is used to induce the diffusion and deeper penetration of the elastomer in the modified aramid fiber, so that the cross-linking force is formed between the buffer layer and the fiber woven layer; after the cryogenic treatment, the modified aramid fiber shrinks, the polyester elastomer is wrapped inside, and at the same time, the roughness of the surface of the modified aramid fiber is increased, and the mechanical chelation force between the woven layer and the buffer layer is increased; then, the elastomer / modified aramid fiber is woven along the surface of the optical cable core into a fiber layer; then, mold pressing is combined with hot air foaming to form a foam buffer layer with uniform cells and good resilience and softness, so that the optical cable sheath has pressure buffering property, and finally, the surface of the buffer layer is etched by using an acid anhydride to form a spiral closed loop structure, when the optical cable is subjected to lateral pressure, the pressure buffering can be realized, and the pressure resistance of the optical cable sheath is improved.

[0022] Secondly, the modified aramid fiber is prepared from aramid fiber, amino pyridine, chloromethyl isonicotinyl aldehyde and cyano benzyl alcohol; the amino group of the amino pyridine, the aldehyde group of the chloromethyl isonicotinyl aldehyde and the cyano group of the cyano benzyl alcohol are subjected to a cycloaddition reaction to generate a pyridine imidazole compound; then, under the action of an oxidant, the pyridine imidazole group is opened to form a carbonyl amide compound, the high bond energy of which can effectively reduce the damage of irradiation to the molecular structure, and the carbonyl amide compound contains a conjugated structure and can absorb radiation energy, so that the optical cable sheath has good radiation resistance; after the aramid fiber is deprotonated, it reacts with the chlorine ion in the carbonyl amide compound to graft it into the molecular chain of the aramid fiber, so as to introduce active groups and effectively improve the bonding strength between the modified aramid fiber and the optical cable core, so that the modified aramid fiber can be firmly attached to the surface of the optical cable core. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0024] In order to more clearly illustrate the method provided by the present application, the following embodiments are used for detailed description, and the test methods of various indexes of the reusable optical cable sheath prepared in the following embodiments are as follows:

[0025] Pressure buffering property: the same size of the embodiments and the comparative examples are taken to test the pressure buffering effect, and according to GB / T7424.2, a short-term crushing force of 4400N / mm and 6000N / mm is applied, the duration is 1min, and the attenuation of the optical cable when crushed is measured.

[0026] Radiation resistance: take the same size of the examples and comparative examples for radiation resistance effect test, in 20 Mrad irradiation dose for 15 min, measure the cable irradiation loss.

[0027] Example 1

[0028] A reusable optical cable coating mainly comprises, by weight fraction: 50 parts of modified aramid fiber, 41 parts of polyester elastomer, 4.1 parts of foaming agent.

[0029] A preparation method of a reusable optical cable coating mainly comprises the following preparation steps:

[0030] (1) The amino pyridine, chloromethyl isonicotinaldehyde, cyanobenzyl alcohol and ethanol are stirred and mixed in a mass ratio of 1:1.5:1.7:3.2, 0.07 times the mass of the amino pyridine is added to the sulfonated cyclodextrin, and after stirring at 80°C and 100 rpm for 6 hours, it is cooled to room temperature, filtered, concentrated at 0.1 MPa and 60°C for 60 minutes, then washed with ethyl acetate and n-hexane for 3 times, and dried at room temperature for 3 hours to obtain a pyridine imidazole compound;

[0031] (2) The pyridine imidazole compound is dissolved in 4 times the mass of the pyridine imidazole compound in dichloroethane, stirred at 50 rpm for 23 minutes, 1.3 times the mass of the pyridine imidazole compound is added to p-toluenesulfonic acid, stirred at the same speed for 39 minutes, then 3.8 times the mass of the pyridine imidazole compound is added to the iodobenzene acetate mixed solution at a rate of 0.3 mL / min, the mass ratio of iodobenzene acetate to dichloroethane in the iodobenzene acetate mixed solution is 1:2.1, stirred at 70°C and 100 rpm for 7 hours, then extracted and chromatographed with petroleum ether / ethyl acetate to obtain a carbon-based amide compound, the volume ratio of petroleum ether to ethyl acetate in petroleum ether / ethyl acetate is 10:1;

[0032] (3) The aramid fiber, 7 times the mass of the aramid fiber in dimethyl sulfoxide, is placed in a container, heated to 30°C under nitrogen atmosphere, 0.016 times the mass of the aramid fiber is added to sodium hydride, heated to 80°C, reacted for 2 hours, then 3 times the mass of the aramid fiber is added to the carbon-based amide compound, reacted for 3 hours, then distilled at 0.1 MPa and 80°C for 85 minutes, washed with deionized water for 7 times, and dried at 70°C for 1 hour to obtain a modified aramid fiber;

[0033] (4) adding the polyester elastomer into a container, heating and stirring for 6 h at 150℃ and 300 rpm, adding a foaming agent with a mass of 0.1 times that of the polyester elastomer, the mass ratio of azodicarbonamide, sodium bicarbonate and citric acid in the foaming agent being 3:1:1, stirring for 10 min at the same speed, and then placing the foaming agent at the bottom of a high-pressure kettle; placing modified aramid fibers with a mass of 1.2 times that of the polyester elastomer on a wire mesh in the kettle, treating for 30 min at 70℃ and 13 MPa in a carbon dioxide atmosphere, then increasing the temperature to 300℃, maintaining the temperature for 14 min, cooling to room temperature, releasing the pressure at a rate of 0.3 MPa / min, then placing the modified aramid fibers in a deep cooling box, cooling at a rate of 2℃ / min, cooling to -80℃, maintaining the temperature for 50 min, cooling to -120℃, maintaining the temperature for 60 min, then cooling to -196℃, maintaining the temperature for 10 h, and then returning to room temperature to obtain polyester elastomer modified fibers;

[0034] (5) taking 30 polyester elastomer modified fibers along the 135° direction and 30 polyester elastomer modified fibers along the 45° direction, cross-weaving the polyester elastomer modified fibers, the weaving pitch being 25 mm, weaving a fiber layer with a thickness of 0.1 mm along the surface of the optical cable core, placing the fiber layer in a flat vulcanizing machine, and molding and foaming the fiber layer for 10 min at 120℃ and 10 MPa, then placing the fiber layer in a hot air aging box, foaming the fiber layer for 11 min at 170℃, then adding maleic anhydride with a mass of 0.2 times that of the polyester elastomer modified fibers, increasing the temperature to 90℃, etching the fiber layer for 52 min, washing the fiber layer with 85℃ warm water for 5 times, and then drying the fiber layer at 70℃ for 8 h to obtain a reusable optical cable cladding layer.

[0035] Example 2

[0036] A reusable optical cable cladding layer mainly comprises, by weight fraction, 60 parts of modified aramid fibers, 44.4 parts of polyester elastomer, and 8.9 parts of foaming agent.

[0037] A method for preparing a reusable optical cable cladding layer, the method mainly comprises the following steps:

[0038] (1) stirring and mixing amino pyridine, chloromethyl isonicotinaldehyde, cyano benzyl alcohol and ethanol according to a mass ratio of 1:1.7:1.9:3.6, adding sulfonated cyclodextrin with a mass of 0.135 times that of the amino pyridine, stirring for 5.5 h at 80℃ and 150 rpm, then cooling to room temperature, filtering, concentrating at 0.3 MPa and 60℃ for 67 min, then washing with ethyl acetate and n-hexane for 4 times, and drying at room temperature for 3.5 h to obtain a pyridine imidazole compound;

[0039] (2) pyridine and imidazole compound is dissolved in 4.5 times of pyridine and imidazole compound mass of dichloroethane, stirring at 75 rpm for 19 min, 1.5 times of pyridine and imidazole compound mass of p-toluene sulfonic acid is added, stirring at the same speed for 33 min, then 4.05 times of pyridine and imidazole compound mass of iodobenzene acetate mixed solution is added at 0.4 mL / min, the mass ratio of iodobenzene acetate and dichloroethane in iodobenzene acetate mixed solution is 1:2.55, stirring at 70℃, 125 rpm for 6.5 h, then extraction is performed, and carbon-based amide compound is obtained by chromatography with petroleum ether / ethyl acetate, the volume ratio of petroleum ether and ethyl acetate in petroleum ether / ethyl acetate is 10:1;

[0040] (3) aramid fiber, 7.5 times of aramid fiber mass of dimethyl sulfoxide is placed in a container, under nitrogen atmosphere, the temperature is raised to 30℃, 0.0205 times of sodium hydride of aramid fiber mass is added, the temperature is raised to 85℃, and the reaction is carried out for 1.5 h, then 3.5 times of carbon-based amide compound of aramid fiber mass is added, the reaction is carried out for 3.5 h, then 89 min of distillation is carried out at 0.2 MPa and 80℃, the modified aramid fiber is obtained by washing with deionized water for 8 times and drying at 70℃ for 2 h;

[0041] (4) polyester elastomer is added to a container, heated and stirred at 150℃ and 350 rpm for 5 h, 0.2 times of foaming agent of polyester elastomer mass is added, the mass ratio of azodicarbonamide, sodium bicarbonate and citric acid in the foaming agent is 3:1:1, stirring at the same speed for 8 min, and then placed at the bottom of the autoclave; 1.35 times of modified aramid fiber of polyester elastomer mass is placed on the wire mesh in the autoclave, treated at 78℃ and 14 MPa for 35 min under carbon dioxide atmosphere, the temperature is raised to 325℃, and the temperature is kept for 12 min, then the pressure is released at 0.6 MPa / min, and then placed in a deep cooling treatment box, the cooling rate is 3℃ / min, the temperature is lowered to -80℃, the temperature is kept for 55 min, then the temperature is lowered to -120℃, the temperature is kept for 65 min, then the temperature is lowered to -196℃, the temperature is kept for 11 h, and then the temperature is raised to room temperature, to obtain polyester elastomer modified fiber;

[0042] (5) 32 polyester elastomer modified fibers are taken along the direction of 140°, and 32 polyester elastomer modified fibers are taken along the direction of 40°, cross-woven, the weaving pitch is 27 mm, and the fiber layer with a thickness of 0.2 mm is woven along the surface of the cable core, placed in a flat vulcanizing machine, molded and foamed at 125℃ and 12 MPa for 8 min, then placed in a hot air aging box, foamed at 175℃ for 9 min, then 0.3 times of maleic anhydride of polyester elastomer modified fiber mass is added, the temperature is raised to 903℃, etched for 49 min, washed with 85℃ warm water for 6 times, and then dried at 70℃ for 9 h to obtain reusable optical cable cladding.

[0043] Example 3

[0044] A reusable optical cable coating mainly comprises, by weight fraction, 70 parts of modified aramid fiber, 47 parts of polyester elastomer and 14.1 parts of foaming agent.

[0045] A preparation method of a reusable optical cable coating mainly comprises the following preparation steps:

[0046] (1) Amino pyridine, chloromethyl isonicotinaldehyde, cyanobenzyl alcohol and ethanol are stirred and mixed according to a mass ratio of 1:1.9:2.1:4.0, sulfonated cyclodextrin in an amount of 0.2 times the mass of amino pyridine is added, stirring is carried out at 80 DEG C and 200 rpm for 5 h, then cooling to room temperature, filtration, 0.5 MPa, 60 DEG C concentration for 75 min, then washed with ethyl acetate and n-hexane for 5 times, and dried at room temperature for 4 h to obtain a pyridine imidazole compound;

[0047] (2) The pyridine imidazole compound is dissolved in dichloroethane in an amount of 5 times the mass of the pyridine imidazole compound, stirring is carried out at 100 rpm for 15 min, p-toluenesulfonic acid in an amount of 1.7 times the mass of the pyridine imidazole compound is added, stirring is carried out at the same speed for 27 min, then the iodobenzene acetate mixed solution in an amount of 4.3 times the mass of the pyridine imidazole compound is added at a rate of 0.5 mL / min, the mass ratio of iodobenzene acetate to dichloroethane in the iodobenzene acetate mixed solution is 1:3.0, stirring is carried out at 70 DEG C and 150 rpm for 6 h, then extraction is carried out, and chromatography is carried out with petroleum ether / ethyl acetate, the volume ratio of petroleum ether to ethyl acetate in the petroleum ether / ethyl acetate is 10:1;

[0048] (3) Aramid fiber and dimethyl sulfoxide in an amount of 8 times the mass of the aramid fiber are placed in a container, under nitrogen atmosphere, the temperature is raised to 30 DEG C, sodium hydride in an amount of 0.025 times the mass of the aramid fiber is added, the temperature is raised to 90 DEG C, reaction is carried out for 1 h, then the carbon-based amide compound in an amount of 4 times the mass of the aramid fiber is added, reaction is carried out for 4 h, then distillation is carried out at 0.3 MPa and 80 DEG C for 94 min, washing is carried out with deionized water for 8 times, and drying is carried out at 70 DEG C for 2.5 h to obtain modified aramid fiber;

[0049] (4) Put the polyester elastomer into a container, heat and stir at 150℃ and 400rpm for 4h, add a foaming agent with a mass of 0.3 times that of the polyester elastomer, the mass ratio of azodicarbonamide, sodium bicarbonate and citric acid in the foaming agent is 3:1:1, stir at the same speed for 5min, and then place the container on the bottom of an autoclave; place the modified aramid fiber with a mass of 1.49 times that of the polyester elastomer on a wire mesh in the autoclave, treat at 85℃ and 15MPa for 30min under a carbon dioxide atmosphere, then heat to 350℃, keep for 10min, cool to room temperature, release the pressure at 0.9MPa / min, then place the container in a deep cooling treatment box, cool at a speed of 4℃ / min, cool to -80℃, keep for 60min, cool to -120℃, keep for 69min, then cool to -196℃, keep for 12h, and then warm to room temperature, to obtain the polyester elastomer modified fiber;

[0050] (5) Take 35 polyester elastomer modified fibers along the 145° direction and 35 polyester elastomer modified fibers along the 35° direction, cross-weave, the weaving pitch is 29mm, weave a fiber layer with a thickness of 0.3mm along the surface of the cable core, place the fiber layer in a flat vulcanization machine, mold and foam at 130℃ and 14MPa for 6min, then place the fiber layer in a hot air aging box, foam at 180℃ for 6min, add maleic anhydride with a mass of 0.4 times that of the polyester elastomer modified fiber, heat to 95℃, etch for 45min, wash with 85℃ warm water for 7 times, and then dry at 70℃ for 10h to obtain the reusable optical cable cladding layer.

[0051] Comparative Example 1

[0052] A reusable optical cable cladding layer mainly comprises, by weight fraction, 60 parts of aramid fiber, 44.4 parts of polyester elastomer, and 8.9 parts of foaming agent.

[0053] A method for preparing a reusable optical cable cladding layer, the method mainly comprises the following preparation steps:

[0054] (1) Put the polyester elastomer into a container, heat and stir at 150℃ and 350rpm for 5h, add a foaming agent with a mass of 0.2 times that of the polyester elastomer, the mass ratio of azodicarbonamide, sodium bicarbonate and citric acid in the foaming agent is 3:1:1, stir at the same speed for 8min, and then place the container on the bottom of an autoclave; place the aramid fiber with a mass of 1.35 times that of the polyester elastomer on a wire mesh in the autoclave, treat at 78℃ and 14MPa for 35min under a carbon dioxide atmosphere, then heat to 325℃, keep for 12min, cool to room temperature, release the pressure at 0.6MPa / min, then place the container in a deep cooling treatment box, cool at a speed of 3℃ / min, cool to -80℃, keep for 55min, cool to -120℃, keep for 65min, then cool to -196℃, keep for 11h, and then warm to room temperature, to obtain the polyester elastomer fiber.

[0055] (2) Take 32 polyester elastomer fibers along the 140° direction, 32 polyester elastomer fibers along the 40° direction, cross-weave, weave pitch is 27 mm, weave a 0.2 mm thick fiber layer along the surface of the optical cable core, place in a flat vulcanizing machine, mold and foam at 125℃, 12 MPa for 8 min, then place in a hot air aging oven, foam at 175℃ for 9 min, then add maleic anhydride in an amount of 0.3 times the mass of the polyester elastomer modified fiber, heat to 903℃, etch for 49 min, wash with 85℃ warm water for 6 times, and then dry at 70℃ for 9 h to obtain the reusable optical cable cladding layer.

[0056] Comparative Example 2

[0057] The prescription composition of Comparative Example 2 is the same as that of Example 2. The difference between the preparation method of the reusable optical cable cladding layer and that of Example 2 is only in step (4), which is modified as follows: the polyester elastomer is added to a container, heated and stirred at 150℃, 350 rpm for 5 h, then a foaming agent is added in an amount of 0.2 times the mass of the polyester elastomer, the mass ratio of azodicarbonamide, sodium bicarbonate and citric acid in the foaming agent is 3:1:1, and then the same speed is stirred for 8 min, then the modified aramid fiber is added in an amount of 1.35 times the mass of the polyester elastomer, heated to 325℃, and kept for 12 min, then cooled to room temperature, then placed in a deep cooling treatment box, the cooling rate is 3℃ / min, cooled to -80℃, kept for 55 min, then cooled to -120℃, kept for 65 min, then cooled to -196℃, kept for 11 h, then warmed to room temperature to obtain the polyester elastomer modified fiber. The remaining preparation steps are the same as those of Example 2.

[0058] Comparative Example 3

[0059] The prescription composition of Comparative Example 3 is the same as that of Example 2. The difference between the preparation method of the reusable optical cable cladding layer and that of Example 2 is only in step (4), which is modified as follows: the polyester elastomer is added to a container, heated and stirred at 150℃, 350 rpm for 5 h, then a foaming agent is added in an amount of 0.2 times the mass of the polyester elastomer, the mass ratio of azodicarbonamide, sodium bicarbonate and citric acid in the foaming agent is 3:1:1, and then the same speed is stirred for 8 min, then placed in the bottom of an autoclave; the modified aramid fiber is placed on the iron wire mesh in the autoclave, treated in a carbon dioxide atmosphere at 78℃, 14 MPa for 35 min to obtain the polyester elastomer modified fiber. The remaining preparation steps are the same as those of Example 2.

[0060] Comparative Example 4

[0061] A reusable optical cable cladding layer mainly comprises, by weight fraction: 60 parts of aramid fiber, 44.4 parts of polyester elastomer, and 8.9 parts of foaming agent.

[0062] A preparation method of a reusable optical cable cladding mainly comprises the following preparation steps:

[0063] (1) polyester elastomer is added into a container, heated and stirred at 150 DEG C and 350 rpm for 5 h, 0.2 times the mass of the polyester elastomer of a foaming agent is added, the mass ratio of azodicarbonamide, sodium bicarbonate and citric acid in the foaming agent is 3:1:1, after stirring at the same speed for 8 min, 1.35 times the mass of the polyester elastomer of modified aramid fiber is added, the temperature is raised to 325 DEG C, and the temperature is kept for 12 min, and then the polyester elastomer modified fiber is obtained after cooling to room temperature;

[0064] (2) 32 polyester elastomer modified fibers are taken along the direction of 140 DEG, 32 polyester elastomer modified fibers are taken along the direction of 40 DEG, and the 32 polyester elastomer modified fibers are cross-woven along the surface of the optical cable core, the weaving pitch is 27 mm, and the fiber layer with a thickness of 0.2 mm is woven along the surface of the optical cable core, and then the fiber layer is placed in a flat vulcanizing machine, and the temperature is raised to 125 DEG C and 12 MPa for 15 min, then 0.3 times the mass of the polyester elastomer modified fiber of maleic anhydride is added, the temperature is raised to 903 DEG C, and etching is performed for 49 min, and then the fiber layer is washed with 85 DEG C warm water for 6 times, and then the fiber layer is dried at 70 DEG C for 9 h to obtain the reusable optical cable cladding.

[0065] Effect example

[0066] The following table 1 shows the performance analysis results of the reusable optical cable cladding of the present application examples 1 to 2 and the comparative examples 1 to 4.

[0067] Table 1

[0068]

[0069] From the experimental data comparison of the examples 1, 2, 3 and the comparative example 4, it can be found that using the modified aramid fiber in the product, improving the molecular bond energy of the aramid fiber, introducing the conjugated structure, reducing the damage of the irradiation to the molecular structure, and absorbing the radiation energy, make the optical cable tend to be stable, so as to realize the radiation resistance of the optical cable coating; then using the supercritical carbon dioxide-heat treatment-cryogenic treatment, the polyester elastomer is firmly fixed in the modified aramid fiber, and on this basis, the foam cushion layer with good resilience and softness is formed, so that the coating has the pressure resistance, and forms the three-network structure with the fiber woven layer, which is beneficial to the pressure resistance of the optical cable coating; from the experimental data comparison of the examples 1, 2, 3 and the comparative example 1, it can be found that if the aramid fiber is not modified, the molecular bond energy of the aramid fiber is low and there is no conjugated structure, which is easy to be affected by the irradiation, the molecular structure is destroyed, thereby the skin is peeled off, which affects the radiation resistance of the optical cable coating and increases the irradiation loss of the optical cable; from the experimental data comparison of the examples 1, 2, 3 and the comparative example 2, it can be found that if the supercritical fluid is not used, the modified aramid fiber is only soaked in the polyester elastomer, and under the help of the gas, the polyester elastomer cannot enter the inside of the modified aramid fiber, but only remains on the surface, at the same time, there is no supercritical carbon dioxide as a reaction medium, the elastomer cannot react with the modified aramid fiber, resulting in that the foam layer is thin and dispersed, and the pressure resistance of the coating is reduced; from the experimental data comparison of the examples 1, 2, 3 and the comparative example 3, it can be found that if the heat treatment is not used, the elastomer cannot diffuse and penetrate deeper in the modified aramid fiber, and at the same time, without the cryogenic treatment, the modified aramid fiber cannot be shrunk, resulting in that the elastomer stays on the surface layer, the crosslinking between the foam layer and the fiber woven layer is weak, and the pressure resistance of the coating is affected.

[0070] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. The present embodiments are therefore considered in all respects to be illustrative and not restrictive, the scope of the present application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No limitation is intended to the scope of the claims on account of the reference to detail herein.

Claims

1. A method of making a reusable optical cable jacket, comprising: The preparation method mainly comprises the following steps: preparation of modified aramid fiber, preparation of polyester elastomer modified fiber through supercritical carbon dioxide-heat treatment-cryogenic treatment, weaving, molding hot air foaming and etching. The specific preparation steps of the reusable optical cable cladding are as follows: (1) The amino pyridine, chloromethyl isonicotinaldehyde, cyanobenzyl alcohol and ethanol are stirred and mixed according to the mass ratio of 1:1.5:1.7:3.2~1:1.9:2.1:4.0, 0.07~0.2 times of sulfonated cyclodextrin of the mass of amino pyridine is added, stirring is carried out at 80℃ and 100~200rpm for 5~6h, then cooling to room temperature, filtering, concentrating at 0.1~0.5MPa and 60℃ for 60~75min, then washing with ethyl acetate and n-hexane for 3~5 times, and drying at room temperature for 3~4h to obtain the pyridine imidazole compound; (2) The pyridine imidazole compound is dissolved in 4~5 times of dichloroethane of the mass of the pyridine imidazole compound, stirring is carried out at 50~100rpm for 15~23min, 1.3~1.7 times of p-toluenesulfonic acid of the mass of the pyridine imidazole compound is added, stirring is carried out at the same speed for 27~39min, then 3.8~4.3 times of iodobenzene acetate mixed solution of the mass of the pyridine imidazole compound is added at 0.3~0.5mL / min, stirring is carried out at 70℃ and 100~150rpm for 6~7h, then extraction is carried out, and petroleum ether / ethyl acetate chromatography is carried out to obtain the carbon-based amide compound; (3) The aramid fiber and 7~8 times of dimethyl sulfoxide of the mass of the aramid fiber are placed in a container, sodium hydride of 0.016~0.025 times of the mass of the aramid fiber is added under nitrogen atmosphere, the temperature is raised to 30℃, the temperature is raised to 80~90℃, the reaction is carried out for 1~2h, then the carbon-based amide compound of 3~4 times of the mass of the aramid fiber is added, the reaction is carried out for 3~4h, then distillation is carried out at 0.1~0.3MPa and 80℃ for 85~94min, the aramid fiber is washed with deionized water for 7~8 times, and drying is carried out at 70℃ for 1~2.5h to obtain the modified aramid fiber; (4) The polyester elastomer is added into a container, heating and stirring are carried out at 150℃ and 300~400rpm for 4~6h, 0.1~0.3 times of the mass of the polyester elastomer of the foaming agent is added, stirring is carried out at the same speed for 5~10min, then the polyester elastomer is placed at the bottom of the autoclave; 1.2~1.5 times of the mass of the modified aramid fiber of the polyester elastomer is placed on the wire mesh in the autoclave, the treatment is carried out under carbon dioxide atmosphere at 70~85℃ and 13~15MPa for 30~40min, then the temperature is raised to 300~350℃, the temperature is kept for 10~14min, the pressure is released at 0.3~0.9MPa / min, then the polyester elastomer is placed in a cryogenic treatment box, the temperature is lowered to-80℃, the temperature is kept for 50~60min, the temperature is lowered to-120℃, the temperature is kept for 60~69min, the temperature is lowered to-196℃, the temperature is kept for 10~12h, and the temperature is raised to room temperature to obtain the polyester elastomer modified fiber. (5) The polyester elastomer modified fiber is braided along the surface of the cable core to form a 0.1-0.3 mm thick fiber layer, and is placed in a flat vulcanizing machine, and is subjected to mold foaming at 120-130 ℃ and 10-14 MPa for 6-10 min, and then is placed in a hot air aging oven, and is foamed at 170-180 ℃ for 6-11 min, and then maleic anhydride in an amount of 0.2-0.4 times the mass of the polyester elastomer modified fiber is added, and the temperature is raised to 90-95 ℃, and etching is performed for 45-52 min, and then the product is washed with 85 ℃ warm water for 5-7 times, and is dried at 70 ℃ for 8-10 h to obtain a reusable optical cable cladding layer.

2. The method of claim 1, wherein the cable jacket is a reusable cable jacket. The iodobenzene acetate mixed solution in step (2) is iodobenzene acetate and dichloroethane mixed at a mass ratio of 1:2.1-1:3.0; and the petroleum ether / ethyl acetate is petroleum ether and ethyl acetate mixed at a volume ratio of 10:

1.

3. The method of claim 1, wherein the method further comprises: The cooling rate of the deep cooling treatment box in step (4) is 2-4 ℃ / min.

4. The method of claim 1, wherein the cable jacket is a reusable cable jacket. In the braiding process in step (5), 30-35 polyester elastomer modified fibers are braided along a direction of 135°-145°, and 30-35 polyester elastomer modified fibers are braided along a direction of 35°-45°, and the braiding pitch is 25-29 mm.

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