Environment-friendly flame-retardant B1-level photoelectric communication cable and preparation method thereof

Abstract

The invention discloses an environment-friendly flame-retardant B1-level photoelectric communication cable and a preparation method thereof.The environment-friendly flame-retardant B1-level photoelectric communication cable comprises a cable sheath, the inner wall of the cable sheath is fixedly connected with a flame-retardant sleeve, the inner wall of the flame-retardant sleeve is fixedly connected with an oxygen isolation layer, the inner wall of the oxygen isolation layer is fixedly connected with a buffer sleeve, and the inner wall of the buffer sleeve is fixedly connected with an insulating layer; the inner wall of the insulating layer is fixedly connected with a shielding layer, and the inner cavity of the shielding layer is filled with flame-retardant cotton. According to the environment-friendly flame-retardant B1-level photoelectric communication cable and the preparation method thereof, the flame retardant contained in the prepared sheath material has better compatibility with matrix resin, is uniformly dispersed in a matrix and has a good flame-retardant effect, the purposes of small amount, high efficiency and cost reduction can be achieved, and meanwhile, after the flame retardant is added, the flame-retardant effect is good. Smoke generated during combustion of the cable material is reduced, it can be guaranteed that the cable material has good physical and mechanical performance and electrical performance, and the whole preparation process is high in environmental protection performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication cable preparation, in particular to an environmentally friendly flame-retardant B1-grade cable for optical and electrical communication and a preparation method thereof. BACKGROUND

[0002] A communication cable is a cable that transmits telephone, telegraph, fax, television and radio programs, data and other electrical signals, and is twisted by more than one pair of mutually insulated wires. Compared with overhead lines, communication cables have the advantages of large communication capacity, high transmission stability, good security, less affected by natural conditions and external interference, etc.

[0003] The existing cable for optical and electrical communication has insufficient flame-retardant effect, cannot provide good protection for the internal core, and produces a large amount of waste gas during preparation, which pollutes the environment, and the preparation process is troublesome and the cost of the preparation material is high, which is not suitable for large-scale production.

[0004] Therefore, it is necessary to provide an environmentally friendly flame-retardant B1-grade cable for optical and electrical communication and a preparation method thereof to solve the above problems. SUMMARY

[0005] The main purpose of the present application is to provide an environmentally friendly flame-retardant B1-grade cable for optical and electrical communication and a preparation method thereof, which can effectively solve the problems in the background art.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows: An environmentally friendly flame-retardant B1-grade cable for optical and electrical communication, comprising a cable sheath, the inner wall of the cable sheath is fixedly connected with a flame-retardant sleeve, the inner wall of the flame-retardant sleeve is fixedly connected with an oxygen barrier layer, the inner wall of the oxygen barrier layer is fixedly connected with a buffer sleeve, the inner wall of the buffer sleeve is fixedly connected with an insulating layer, the inner wall of the insulating layer is fixedly connected with a shielding layer, and the inner cavity of the shielding layer is filled with flame-retardant cotton.

[0007] Preferably, the inner cavity of the oxygen barrier layer is fixedly connected with fireproof filler, the outer circle of the inner cavity of the buffer sleeve is fixedly connected with second elastic resin, the inner circle of the inner cavity of the buffer sleeve is fixedly connected with first elastic resin, the inner cavity of the shielding layer is fixedly connected with polyester amine isolation sleeves, there are three polyester amine isolation sleeves, the inner cavity of the shielding layer is divided into three spaces by the three polyester amine isolation sleeves, the middle of the inner cavity of the shielding layer is fixedly connected with a main core, and the inner cavities of the three spaces are symmetrically fixedly connected with auxiliary cores.

[0008] A preparation method of an environmentally friendly flame-retardant B1-grade cable for optical and electrical communication, comprising the following preparation process: S1: Preparation of the sheath: Prepare raw materials, including: EVA, POE, compatibilizer, two kinds of flame retardants, antioxidant and rheological modifier, first melt and mix the resins such as EVA, POE and compatibilizer uniformly on a two-wheel open mill, then add the flame retardants, antioxidant and rheological modifier, prepare halogen-free flame-retardant composite material, wherein the mixing temperature of the two-wheel open mill is 130℃, the time is 15min, the speed is 40r / min, after discharging, preheat for 3min at a temperature of 165℃ and a pressure of 15MPa on a flat vulcanizing machine, press for 5min, cool to room temperature, seal the prepared material with polyethylene film, irradiate it, the irradiation dose rate is 10kGy / h, the atmosphere is nitrogen, and the sheath is prepared after a period of irradiation, which can be used as cable sheath and buffer sleeve; S2: Preparation of the flame-retardant sleeve: Prepare 100 parts of ethylene-propylene rubber, 5 parts of zinc oxide, 2 parts of stearic acid, 1.5 parts of antioxidant RD, 1.5 parts of paraffin, 10 parts of tricresyl phosphate, 15 parts of expanded graphite, 15 parts of high wear-resistant furnace black, 50 parts of ultra-fine magnesium hydroxide, 50 parts of polyphosphate, 50 parts of melamine, 3 parts of accelerator, and 1.5 parts of sulfur. Mix the ethylene-propylene rubber, zinc oxide, stearic acid, antioxidant RD, paraffin, tricresyl phosphate, expanded graphite, high wear-resistant furnace black, ultra-fine magnesium hydroxide, polyphosphate, melamine, accelerator, and sulfur in the mixing machine according to the proportions, and mix them at a temperature of 150℃ for 30min at a speed of 50r / min. After the treatment, transfer them to the extruder for extrusion to prepare the flame-retardant sleeve. S3: Preparation of the environmentally friendly flame-retardant B-grade optical communication cable: Stick the polyester amine spacer sleeve in the inner cavity of the shielding layer, fill the shielding layer inner cavity with flame-retardant cotton, normally install the main core and the auxiliary core in the inner cavity of the shielding layer, stick the insulating layer on the outer wall of the shielding layer, fix the first and second elastic resins in the inner and outer circles of the buffer sleeve inner cavity, stick the buffer sleeve on the outer wall of the insulating layer, stick the oxygen barrier layer on the outer wall of the buffer sleeve, stick the flame-retardant sleeve on the outer wall of the oxygen barrier layer, and stick the cable sheath on the outer wall of the flame-retardant sleeve to prepare the environmentally friendly flame-retardant B-grade optical communication cable.

[0009] Preferably, one of the flame retardants is a silane coupling agent modified hydroxide flame retardant, wherein the median particle size D50so of ATH is 1.44um, and the median particle size D50so of MDH is 2um, and the other flame retardant is a phosphorus-nitrogen flame retardant.

[0010] Preferably, the oxygen barrier layer is mineral mud, the fireproof filler is fire-resistant mica tape winding, the first and second elastic resins are polyvinyl acetate resins, the insulating layer is cross-linked polyethylene, the shielding layer is a metal wire braided wave-proof sleeve, and the outer wall of the metal wire braided wave-proof sleeve is coated with a guide material paint.

[0011] Advantages Compared with the prior art, the present application provides an environmentally friendly flame-retardant B1-grade optical communication cable and a preparation method thereof, which has the following advantages: 1. The environmentally friendly flame-retardant B1-grade optical communication cable and the preparation method thereof, by preparing the sheath material, the flame retardant has good compatibility with the base resin, is uniformly dispersed in the base, has good flame retardant effect, can achieve the purpose of less amount and high efficiency, and reduces the cost. After adding the flame retardant, the smoke generated during the burning of the cable material is reduced, and the cable material can also have good physical and mechanical properties and electrical properties. The flame-retardant sleeve prepared by the preparation method has a fast burning speed of the glue material, a high heat release rate, and a small waste smoke density during preparation, and also has less residue after burning, so that the environmental protection is strong. The oxygen barrier layer prepared from the mineral mud can further improve the overall flame-retardant effect and can isolate most of the oxygen. The buffer sleeve composed of the first and second elastic resins can have a good buffering effect on the cable sheath, so as to have a good protective effect on the main line core and the auxiliary line core in the inner cavity. The flame-retardant cotton and the fireproof filler can both have a good flame-retardant effect on the whole. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is the positive structure diagram of the present application; Figure 2 is the positive structure diagram of the present application Figure 1 is an enlarged view of A in the present application.

[0013] In the figure: 1, cable sheath; 2, flame-retardant sleeve; 3, oxygen barrier layer; 4, fireproof filler; 5, buffer sleeve; 6, first elastic resin; 7, second elastic resin; 8, insulation layer; 9, shielding layer; 10, polyester amine spacer sleeve; 11, flame-retardant cotton; 12, main line core; 13, auxiliary line core. DETAILED DESCRIPTION

[0014] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0015] For example Figures 1-2As shown, an environmentally friendly flame-retardant B1-grade optoelectronic communication cable includes a cable sheath 1, a flame-retardant sleeve 2 fixedly connected to the inner wall of the cable sheath 1, an oxygen barrier layer 3 fixedly connected to the inner wall of the flame-retardant sleeve 2, a buffer sleeve 5 fixedly connected to the inner wall of the oxygen barrier layer 3, an insulation layer 8 fixedly connected to the inner wall of the buffer sleeve 5, a shielding layer 9 fixedly connected to the inner wall of the insulation layer 8, flame-retardant cotton 11 filling the inner cavity of the shielding layer 9, fireproof filler 4 fixedly connected to the inner cavity of the oxygen barrier layer 3, a second elastic resin 7 fixedly connected to the outer ring of the inner cavity of the buffer sleeve 5, a first elastic resin 6 fixedly connected to the inner ring of the inner cavity of the buffer sleeve 5, and three polyesteramine spacers 10 fixedly connected to the inner cavity of the shielding layer 9, which divide the inner cavity of the shielding layer 9 into three spaces. A main conductor 12 is fixedly connected to the center of the inner cavity of the shielding layer 9, and secondary conductors 13 are symmetrically fixedly connected to the inner cavities of the three spaces.

[0016] like Figures 1-2 As shown, a method for preparing an environmentally friendly, flame-retardant, B1-grade optoelectronic communication cable includes the following preparation process: S1: Sheath Preparation: Prepare raw materials, including: EVA, POE, compatibilizer, two flame retardants, antioxidant, and rheology modifier. First, melt and mix the EVA, POE, and compatibilizer resins evenly on a two-wheel open mill. Then, add the flame retardant, antioxidant, and rheology modifier sequentially to prepare a halogen-free flame-retardant composite material. The mixing temperature on the two-wheel open mill is 130℃, the mixing time is 15 minutes, and the rotation speed is 40 r / min. After discharge, pre-mix the material on a flat vulcanizing machine at a temperature of 165℃ and a pressure of 15 MPa. Heat for 3 minutes, pressurize for 5 minutes, cool to room temperature, seal the prepared material with polyethylene film, and irradiate it at an irradiation dose rate of 10 kGy / h in a nitrogen atmosphere. After irradiation for a period of time, a sheath is prepared. This sheath can be used as cable sheath 1 and buffer sheath 5. One of the flame retardants is a hydroxide flame retardant modified with silane coupling agent, wherein the median particle size D5so of ATH is 1.44 μm and the median particle size Dso of MDH is 2 μm. The other flame retardant is a phosphorus-nitrogen flame retardant.

[0017] S2: Preparation of the flame-retardant sleeve 2: 100 parts of ethylene-propylene rubber, 5 parts of zinc oxide, 2 parts of stearic acid, 1.5 parts of antioxidant RD, 1.5 parts of paraffin wax, 10 parts of tricresyl phosphate, 15 parts of expanded graphite, 15 parts of high-wear-resistance furnace black, 50 parts of ultra-fine magnesium hydroxide, 50 parts of polyphosphate, 50 parts of melamine, 3 parts of accelerator, and 1.5 parts of sulfur are prepared, and the ethylene-propylene rubber, zinc oxide, stearic acid, antioxidant RD, paraffin wax, tricresyl phosphate, expanded graphite, high-wear-resistance furnace black, ultra-fine magnesium hydroxide, polyphosphate, melamine, accelerator, and sulfur are sequentially added to a mixer for mixing treatment at a temperature of 150 DEG C, a time of 30 min, and a rotation speed of 50 r / min, and after the treatment, the mixture is transferred to an extruder for extrusion to prepare the flame-retardant sleeve 2.

[0018] S3: Preparation of the environmentally-friendly flame-retardant B1-grade optical-electric communication cable: the polyester amine spacer sleeve 10 is adhered in the inner cavity of the shielding layer 9, the flame-retardant cotton 11 is filled in the inner cavity of the shielding layer 9, the main wire core 12 and the auxiliary wire core 13 are normally installed in the inner cavity of the shielding layer 9, the insulating layer 8 is adhered to the outer wall of the shielding layer 9, the first elastic resin 6 and the second elastic resin 7 are fixed to the inner ring and the outer ring of the inner cavity of the buffer sleeve 5, the buffer sleeve 5 is adhered to the outer wall of the insulating layer 8, the oxygen barrier layer 3 is adhered to the outer wall of the buffer sleeve 5, the flame-retardant sleeve 2 is adhered to the outer wall of the oxygen barrier layer 3, and the cable sheath 1 is adhered to the outer wall of the flame-retardant sleeve 2 to prepare the environmentally-friendly flame-retardant B1-grade optical-electric communication cable, the oxygen barrier layer 3 is mineral mud, the fireproof filler 4 is wrapped with fire-resistant mica tape, the first elastic resin 6 and the second elastic resin 7 are polyvinyl acetate resins, the insulating layer 8 is cross-linked polyethylene, the shielding layer 9 is a metal wire braided wave-proof sleeve, and the outer wall of the metal wire braided wave-proof sleeve is coated with a material guide paint. Specific embodiment one: According to the prepared cable, the performance of the cable is tested, including comparison with the performance of the remaining cables, and the following is a test table: Therefore, the environmentally-friendly flame-retardant B1-grade optical-electric communication cable prepared by the present application has obvious improvement in various performances.

[0020] Through the prepared sheath material, the flame retardant is compatible with the matrix resin, is uniformly dispersed in the matrix, has good flame retardant effect, can achieve the purpose of small amount and high efficiency, and reduces the cost. After adding the flame retardant, the smoke generated during the combustion of the cable material is reduced, and the cable material can also have good physical and mechanical properties and electrical properties. Through the preparation of the flame-retardant sleeve 2, the glue burns fast, the heat release rate is high, the waste smoke density is small, and the residue after combustion is small, so the environmental protection is strong. The oxygen barrier layer 3 prepared from the mineral mud can further improve the overall flame-retardant effect and can isolate most of the oxygen. The buffer sleeve 5 composed of the first elastic resin 6 and the second elastic resin 7 can have a good buffering effect on the cable sheath 1, so as to have a good protection effect on the main wire core 12 and the auxiliary wire core 13 in the inner cavity. The flame-retardant cotton 11 and the fireproof filler 4 can all have a good flame-retardant effect on the whole.

[0021] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly flame-retardant B1 class cable for optical and electrical communication, comprising a cable sheath (1), characterized in that: The inner wall of the cable sheath (1) is fixedly connected with a flame-retardant sleeve (2), the inner wall of the flame-retardant sleeve (2) is fixedly connected with an oxygen barrier layer (3), the inner wall of the oxygen barrier layer (3) is fixedly connected with a buffer sleeve (5), the inner wall of the buffer sleeve (5) is fixedly connected with an insulating layer (8), the inner wall of the insulating layer (8) is fixedly connected with a shielding layer (9), and the inner cavity of the shielding layer (9) is filled with flame-retardant cotton (11).

2. The environmentally friendly flame-retardant B1-level cable for optical communication according to claim 1, characterized in that: The inner cavity of the oxygen barrier layer (3) is fixedly connected with a fireproof filler (4), the outer circle of the inner cavity of the buffer sleeve (5) is fixedly connected with a second elastic resin (7), the inner circle of the inner cavity of the buffer sleeve (5) is fixedly connected with a first elastic resin (6), the inner cavity of the shielding layer (9) is fixedly connected with polyester amine isolation sleeves (10), there are three polyester amine isolation sleeves (10), the inner cavity of the shielding layer (9) is divided into three spaces by the polyester amine isolation sleeves (10), and the middle of the inner cavity of the shielding layer (9) is fixedly connected with a main wire core (12).

3. The preparation method of the environmentally friendly flame-retardant B1-level optical communication cable according to claim 1, characterized in that: The preparation process comprises the following steps: S1: preparation of the sheath: preparing raw materials, including EVA, POE, a compatibilizer, two kinds of flame retardants, an antioxidant and a rheological modifier, firstly melting and uniformly mixing the resins of EVA, POE and the compatibilizer on a double-wheel open mill, then adding the flame retardants, the antioxidant and the rheological modifier one by one, preparing a halogen-free flame-retardant composite material, wherein the mixing temperature of the double-wheel open mill is 130 DEG C, the time is 15 min, and the rotating speed is 40 r / min; after discharging, preheating for 3 min and pressurizing for 5 min under the conditions of a temperature of 165 DEG C and a pressure of 15 MPa on a flat vulcanizing machine, and cooling to room temperature, the prepared material is sealed with a polyethylene film, irradiated at a dose rate of 10 kGy / h in a nitrogen atmosphere, and the sheath is prepared after a period of irradiation; the sheath can be used as the cable sheath (1) and the buffer sleeve (5); S2: preparation of the flame-retardant sleeve (2): preparing 100 parts of ethylene-propylene rubber, 5 parts of zinc oxide, 2 parts of stearic acid, 1.5 parts of antioxidant RD, 1.5 parts of paraffin, 10 parts of tricresyl phosphate, 15 parts of expanded graphite, 15 parts of high-wear-resistance furnace black, 50 parts of ultra-fine magnesium hydroxide, 50 parts of polyphosphate, 50 parts of melamine, 3 parts of accelerator and 1.5 parts of sulfur; the ethylene-propylene rubber, the zinc oxide, the stearic acid, the antioxidant RD, the paraffin, the tricresyl phosphate, the expanded graphite, the high-wear-resistance furnace black, the ultra-fine magnesium hydroxide, the polyphosphate, the melamine, the accelerator and the sulfur are sequentially added to a mixing machine for mixing treatment at a temperature of 150 DEG C, a time of 30 min and a rotating speed of 50 r / min; and the flame-retardant sleeve (2) is prepared by transferring the mixture to an extruder for extrusion. S3: Preparation of the environmentally-friendly flame-retardant B1-level cable for photoelectric communication: the polyester amine spacer sleeve (10) is adhered in the inner cavity of the shielding layer (9), the flame-retardant cotton (11) is filled in the inner cavity of the shielding layer (9), the main wire core (12) and the auxiliary wire core (13) are normally installed in the inner cavity of the shielding layer (9), the insulating layer (8) is adhered on the outer wall of the shielding layer (9), the first elastic resin (6) and the second elastic resin (7) are fixed in the inner ring and the outer ring of the buffer sleeve (5), the buffer sleeve (5) is adhered on the outer wall of the insulating layer (8), the oxygen barrier layer (3) is adhered on the outer wall of the buffer sleeve (5), the flame-retardant sleeve (2) is adhered on the outer wall of the oxygen barrier layer (3), and the cable sheath (1) is adhered on the outer wall of the flame-retardant sleeve (2), so as to prepare the environmentally-friendly flame-retardant B1-level cable for photoelectric communication.

4. The preparation method of the environmentally friendly flame-retardant B1-level cable for optical communication according to claim 3, characterized in that: The one of the flame retardants is a hydroxide flame retardant modified by a silane coupling agent, wherein the median particle size D50so of the ATH is 1.44 um, and the median particle size D50 of the MDH is 2 um, and the other flame retardant is a phosphorus-nitrogen flame retardant.

5. The preparation method of the environmentally friendly flame-retardant B1-level cable for optical communication according to claim 3, characterized in that: The oxygen barrier layer (3) is a mineral mud, the fireproof filler (4) is a fireproof mica tape, the first elastic resin (6) and the second elastic resin (7) are polyvinyl acetate resins, the insulating layer (8) is a cross-linked polyethylene, the shielding layer (9) is a metal wire braided wave-proof sleeve, and the outer wall of the metal wire braided wave-proof sleeve is coated with a guide material paint.

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