Thermal insulation composite cable

Abstract

The invention discloses a thermal insulation composite cable, comprising several conductors and a light unit, wherein the conductors and the light unit are twisted together, an insulating sheath is provided on the outside of the conductor, and a light unit sheath is provided on the outside of the light unit; the light unit sheath comprises the following materials in parts by weight: 72 parts of ethylene-vinyl acetate copolymer, 16 parts of linear low-density polyethylene, 12 parts of ethylene propylene diene monomer rubber, 1 part of vinyl triethoxysilane, 1.5 parts of didodecyl thiodipropionate, 1.6 parts of silicone masterbatch, 3.5 parts of lead oxide powder, 4 parts of ethoxylated trimethylolpropane triacrylate, 1.2 parts of N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate, 0.8 parts of diphenylguanidine, 1 part of sodium lauryl sulfate, and 0.6 parts of a dispersant. The thermal insulation composite cable of the present invention can isolate the external high temperature and extend the service life of the light unit.

Description

Technical Field

[0001] The present invention relates to a composite cable, in particular to a heat-insulated composite cable. Background Art

[0002] Optical Fiber Composite Low-voltage Cable (OPLC) is a composite cable that combines optical units in low-voltage power cables. It can transmit both power information and optical communication, and is suitable for low-voltage distribution network projects. As one of the important cable products in the construction of smart grids, OPLC integrates the functions of power and communication, reduces the cost of network construction, and is one of the most cost-effective "multi-network integration" products currently available. The existing national standard stipulates that the maximum temperature of the OPLC conductor shall 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 object of the present invention is to provide a thermally insulated 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 present invention adopts the following technical solution: a thermally insulated 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;

[0005] The optical unit sheath includes the following materials in parts by weight: 72 parts of ethylene-vinyl acetate copolymer, 16 parts of linear low-density polyethylene, 12 parts of ethylene propylene diene monomer rubber, 1 part of vinyl triethoxysilane, 1.5 parts of didodecyl thiodipropionate, 1.6 parts of silicone masterbatch, 3.5 parts of lead oxide powder, 4 parts of ethoxylated trimethylolpropane triacrylate, 1.2 parts of N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate, 0.8 parts of diphenylguanidine, 1 part of sodium lauryl sulfate, and 0.6 parts of dispersant.

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

[0007] 1. In the above solution, the vinyl acetate in the ethylene-vinyl acetate copolymer accounts for 40% of the total weight of the ethylene-vinyl acetate copolymer.

[0008] 2. 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.

[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 thermally insulated composite cable of the present invention further comprises 1.2 parts of N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate to 72 parts of ethylene-vinyl acetate copolymer, 16 parts of linear low-density polyethylene, 12 parts of ethylene propylene diene monomer rubber, 1 part of vinyl triethoxysilane, 1.5 parts of didodecyl thiodipropionate, 1.6 parts of silicone masterbatch, 3.5 parts of lead oxide powder, and 4 parts of ethoxylated trimethylolpropane triacrylate, 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 thermally insulated composite cable of the present invention further adds sodium lauryl sulfate and diphenylguanidine to the formula to improve the thermal shrinkage of the sheath and reduce the thermal shrinkage rate of the sheath to ≤1%. This prevents the sheath from undergoing significant deformation when receiving heat generated by the conductor and also protects the internal optical unit. DETAILED DESCRIPTION

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

[0013] Embodiment: A thermally insulated composite cable comprises a plurality of conductors and optical units, the conductors and optical units being twisted together, the conductors and optical units being provided with a wrapping tape on the outside thereof, a tear cord being embedded in the wrapping tape, an outer sheath being provided on the outside thereof, an insulating sheath 2 being provided on the outside thereof, and an optical unit sheath being provided on the outside thereof;

[0014] The optical unit sheath of the above embodiment is composed of the following components: 72 parts of ethylene-vinyl acetate copolymer, 16 parts of linear low-density polyethylene, 12 parts of ethylene propylene diene monomer rubber, 1 part of vinyl triethoxysilane, 1.5 parts of didodecyl thiodipropionate, 1.6 parts of silicone masterbatch, 3.5 parts of lead oxide powder, 4 parts of ethoxylated trimethylolpropane triacrylate, 1.2 parts of N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate, 0.8 parts of diphenylguanidine, 1 part of sodium lauryl sulfate, and 0.6 parts of dispersant.

[0015] The vinyl acetate in the ethylene-vinyl acetate copolymer accounts for 40% of the total weight of the ethylene-vinyl acetate copolymer.

[0016] The EPDM rubber is a terpolymer of ethylene, propylene and a non-conjugated diene, wherein the ratio of ethylene to propylene is 80:20.

[0017] The thermal insulation composite cable is prepared by the following steps:

[0018] 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;

[0019] 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, diphenylguanidine, sodium lauryl sulfate, and a dispersant were added to an internal mixer and mixed at 70-90° C. for 1-5 min to obtain material B;

[0020] S3. The materials A and B are mixed and unloaded into the mixing mill;

[0021] 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.

[0022] Comparative Examples 1-2: A sheath comprising the following materials in parts by weight:

[0023] Table 1

[0024]

[0025] The preparation method is a common method.

[0026] The performance test data of the films prepared in each embodiment and comparative example are as follows:

[0027] Table 2

[0028]

[0029] As shown in Table 2, 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.

[0030] Compared with the examples, Comparative Example 2 lacks the components sodium lauryl sulfate and diphenylguanidine. The thermal shrinkage rate of the sheath prepared in Comparative Example 2 is greater than that of the optical unit sheath prepared in the examples, that is, the thermal shrinkage performance of the sheath prepared in the comparative example is poor.

[0031] The optical unit sheath prepared in each embodiment of the present invention has better thermal shrinkage and thermal conductivity than the optical unit sheath of the comparative example. The optical unit sheath prepared in the present invention is 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.

[0032] 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 thermally insulated composite cable, characterized in that: 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: 72 parts of ethylene-vinyl acetate copolymer, 16 parts of linear low-density polyethylene, 12 parts of ethylene propylene diene monomer rubber, 1 part of vinyl triethoxysilane, 1.5 parts of didodecyl thiodipropionate, 1.6 parts of silicone masterbatch, 3.5 parts of lead oxide powder, 4 parts of ethoxylated trimethylolpropane triacrylate, 1.2 parts of N,N,N',N'-tetrakis[4-(dibutylamino)phenyl]-1,4-phenylenediamine hexafluoroantimonate, 0.8 parts of diphenylguanidine, 1 part of sodium lauryl sulfate, and 0.6 parts of dispersant.

2. The thermally insulated composite cable according to claim 1, wherein: The vinyl acetate of the ethylene-vinyl acetate copolymer accounts for 40% of the total weight of the ethylene-vinyl acetate copolymer.

3. The thermally insulated composite cable according to claim 1, wherein: The EPDM rubber is a terpolymer of ethylene, propylene and a non-conjugated diene, wherein the ratio of ethylene to propylene is 80:20.

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