High-toughness optical fiber composite cable

Abstract

The invention discloses a high-toughness optical fiber composite cable, comprising several conductors and an optical unit, a tear cord embedded in a wrapping tape, an outer sheath provided on the outer side of the wrapping tape, an insulating sheath provided on the outer side of the conductor, and an optical unit sheath provided on the outer side of the optical unit. The optical unit sheath comprises the following materials in parts by weight: ethylene-vinyl acetate copolymer, linear low-density polyethylene, ethylene propylene diene monomer (EPDM), vinyl triethoxysilane, didodecyl thiodipropionate, silicone masterbatch, lead oxide powder, ethoxylated trimethylolpropane triacrylate, N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate, zinc dibutyldithiocarbamate, and triethylhexyl phosphoric acid. The optical unit sheath in the high-toughness optical fiber composite cable of the present invention has thermal insulation performance, which can protect the internal optical unit from being affected by the external temperature.

Description

Technical Field

[0001] The present invention relates to a composite cable, in particular to a high-toughness optical fiber composite cable. Background Art

[0002] Fireproof cables are an important component of cable products. At present, the most widely used fireproof cables are mainly divided into two categories: UL series flame-retardant cables and flame-retardant low-smoke halogen-free cables. The application of fireproof cables can keep the cables in use when a fire occurs and produce less toxic gases when a fire occurs. The maximum temperature of the conductor in the existing fireproof cable does not exceed 90 degrees Celsius during normal operation, but in the event of a short circuit, the temperature of the conductor can reach 250 degrees for a short time (up to 5 seconds). The optical unit located on one side of the conductor will inevitably be damaged under high temperature conditions, affecting signal transmission. Therefore, how to provide an optical unit sheath that can isolate heat in a short period of time under high temperature conditions has become the direction of efforts of those skilled in the art. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-toughness optical fiber composite cable, in which the optical unit sheath can isolate the external high temperature, protect the communication materials inside the optical unit, avoid damage to the optical unit, and effectively ensure the transmission stability of the signal.

[0004] To achieve the above-mentioned object, the technical solution adopted by the present invention is: a high-toughness optical fiber composite cable, comprising a plurality of conductors and optical units, wherein the conductors and optical units are twisted together, a wrapping tape is provided on the outside of the conductors and optical units, a tear cord is embedded in the wrapping tape, an outer sheath is provided on the outside of the wrapping tape, an insulating sheath is provided on the outside of the conductors, and an optical unit sheath is provided on the outside of the optical unit, wherein the optical unit sheath comprises the following materials in parts by weight:

[0005] The optical unit sheath includes the following materials in parts by weight: 68 parts of ethylene-vinyl acetate copolymer, 20 parts of linear low-density polyethylene, 13 parts of ethylene propylene diene monomer rubber, 1.5 parts of vinyl triethoxysilane, 2 parts of didodecyl thiodipropionate, 0.5 parts of silicone masterbatch, 5 parts of lead oxide powder, 3 parts of ethoxylated trimethylolpropane triacrylate, 3 parts of N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate, 1.5 parts of zinc dibutyl dithiocarbamate, 2 parts of triethylhexyl phosphoric acid, and 0.8 parts of dispersant.

[0006] The technical solutions further improved in the above technical solutions are as follows:

[0007] 1. In the above solution, the EPDM rubber is a terpolymer of ethylene, propylene and a non-conjugated diene, wherein the ratio of ethylene to propylene is 80:20.

[0008] 2. In the above solution, there are four conductors arranged in a circle, and the optical unit is located outside the circle.

[0009] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0010] 1. The high-toughness optical fiber composite cable of the present invention further comprises 3 parts of N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate added to 68 parts of ethylene-vinyl acetate copolymer, 20 parts of linear low-density polyethylene, 13 parts of ethylene propylene diene monomer rubber, 1.5 parts of vinyl triethoxysilane, 2 parts of didodecyl thiodipropionate, 0.5 parts of silicone masterbatch, and 5 parts of lead oxide powder, so that the thermal conductivity of the sheath is ≤0.05 W / (mK), giving the sheath thermal insulation properties, thereby protecting the internal optical unit from the influence of external temperature and extending the service life of the optical unit.

[0011] 2. The high-toughness optical fiber composite cable of the present invention further adds ethoxylated trimethylolpropane triacrylate and zinc dibutyldithiocarbamate to the formula to improve the toughness of the sheath and increase its elongation at break, so that the sheath will not break under the action of external force. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the embodiments:

[0013] Embodiment: A high-toughness optical fiber composite cable comprises a plurality of conductors and optical units, wherein the conductors and optical units are twisted together, a wrapping tape is provided on the outside of the conductors and optical units, a tear cord is embedded in the wrapping tape, an outer sheath is provided on the outside of the wrapping tape, an insulating sheath is provided on the outside of the conductors, and an optical unit sheath is provided on the outside of the optical unit;

[0014] The optical unit sheath is composed of the following components: 68 parts of ethylene-vinyl acetate copolymer, 20 parts of linear low-density polyethylene, 13 parts of ethylene propylene diene monomer rubber, 1.5 parts of vinyl triethoxysilane, 2 parts of didodecyl thiodipropionate, 0.5 parts of silicone masterbatch, 5 parts of lead oxide powder, 3 parts of ethoxylated trimethylolpropane triacrylate, 3 parts of N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate, 1.5 parts of zinc dibutyl dithiocarbamate, 2 parts of triethylhexyl phosphoric acid, and 0.8 parts of dispersant.

[0015] The vinyl acetate of the ethylene-vinyl acetate copolymer accounts for 40% of the total weight of the ethylene-vinyl acetate copolymer; the EPDM rubber is a terpolymer of ethylene, propylene and a non-conjugated diene, wherein the ratio of ethylene to propylene is 80:20; the density of the linear low-density polyethylene is 0.910-0.915 g / cm 3 .

[0016] The high-toughness optical fiber composite cable is prepared by the following steps:

[0017] S1. Ethylene-vinyl acetate copolymer, linear low-density polyethylene and EPDM rubber were added to an internal mixer and mixed at 60-80 ° C for 5-10 min to obtain material A;

[0018] S2. Vinyl triethoxysilane, didodecyl thiodipropionate, silicone masterbatch, lead oxide powder, ethoxylated trimethylolpropane triacrylate, N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate, zinc dibutyldithiocarbamate, triethylhexyl phosphoric acid, and a dispersant were added to an internal mixer and mixed at 70-90° C. for 1-5 min to obtain material B;

[0019] S3. The materials A and B are mixed and unloaded into the mixing mill;

[0020] S4. Material A and B are triangularly packaged 3 to 4 times on an open mill, the roll temperature of the open mill is controlled at 60°C, and finally sheets are produced on a calender to obtain a light unit sheath material.

[0021] Comparative Examples 1-2: A sheath comprising the following materials in parts by weight, as shown in Table 1:

[0022] Table 1

[0023]

[0024] The preparation method is a common method.

[0025] The performance test data of the films prepared in each embodiment and comparative example are as follows:

[0026] Table 2

[0027]

[0028] As shown in Table 3, compared with the example, Comparative Example 1 lacks the component N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate. The thermal conductivity of the sheath prepared in Comparative Example 1 is much greater than the thermal conductivity of the optical unit sheath prepared in the example, that is, the thermal insulation performance of the sheath prepared in the comparative example is poor.

[0029] Compared with the examples, Comparative Example 2 lacks the components ethoxylated trimethylolpropane triacrylate and zinc dibutyldithiocarbamate. The elongation at break of the sheath prepared in Comparative Example 2 is less than the elongation at break of the optical unit sheath prepared in the examples, that is, the toughness of the sheath prepared in the comparative example is poor.

[0030] The optical unit sheaths prepared in each embodiment of the present invention are superior to the optical unit sheaths of the comparative example in terms of tensile strength, elongation at break, and thermal conductivity. The optical unit sheaths prepared in the present invention are used to protect the optical unit, can isolate the external high temperature, protect the communication materials inside the optical unit, and avoid damage to the optical unit.

[0031] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A high-toughness optical fiber composite cable, characterized by: The device comprises a plurality of conductors and optical units, wherein the conductors and optical units are twisted together, a wrapping tape is provided on the outside of the conductors and optical units, a tear cord is embedded in the wrapping tape, an outer sheath is provided on the outside of the wrapping tape, an insulating sheath is provided on the outside of the conductors, and an optical unit sheath is provided on the outside of the optical unit; The optical unit sheath includes the following materials in parts by weight: 68 parts of ethylene-vinyl acetate copolymer, 20 parts of linear low-density polyethylene, 13 parts of ethylene propylene diene monomer rubber, 1.5 parts of vinyl triethoxysilane, 2 parts of didodecyl thiodipropionate, 0.5 parts of silicone masterbatch, 5 parts of lead oxide powder, 3 parts of ethoxylated trimethylolpropane triacrylate, 3 parts of N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate, 1.5 parts of zinc dibutyl dithiocarbamate, 2 parts of triethylhexyl phosphoric acid, and 0.8 parts of dispersant.

2. The high-toughness optical fiber composite cable according to claim 1, characterized in that: The EPDM rubber is a terpolymer of ethylene, propylene and a non-conjugated diene, wherein the ratio of ethylene to propylene is 80:

20.

3. The high-toughness optical fiber composite cable according to claim 1, characterized in that: There are four conductors arranged in a circle, and the optical unit is located outside the circle.

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