WO2021232711A1 - Cold-resistant data transmission cable - Google Patents

Abstract

Disclosed is a cold-resistant data transmission cable, comprising a cable core composed of a stranded conductor (1) and a filling rope (7), and a cold-resistant cladding tape layer (3), a cold-resistant inner sleeve layer (4), a metal braid layer (5) and a cold-resistant outer sleeve (6), which are wrapped on the outside of the cable core in order, wherein the surface of the stranded conductor (1) is provided with an insulating layer (2); and raw materials of the cold-resistant inner sleeve layer (4) and the cold-resistant outer sleeve (6) include, in parts by weight, the following components: 15-40 parts of a methyl vinyl phenyl silicone rubber, 25-40 parts of a 1,4-polybutadiene rubber, 10-30 parts of a linear low-density polyethylene, 3-9 parts of zinc oxide, 2-6 parts of calcium stearate, 2-8 parts of a crosslinker, 1-3 parts of an assistant crosslinker and 0.6-2 parts of an anti-aging agent. The cold-resistant performance of the cable is relatively good.

Description

Cold-resistant data transmission cable

This application claims the priority of a Chinese patent application whose application date is May 18, 2020, the application number is CN202010421103.0, and the invention title is "a cold-resistant data transmission cable", the entire content of which is incorporated into this application by reference middle.

Technical field

The invention relates to the technical field of cables, in particular to a cold-resistant data transmission cable.

Background technique

In recent years, the development of wire and cable varieties has shown a diversified trend. It has shifted from a simple power transmission function to a multi-function, that is, new features have been added according to different uses, such as: low smoke and halogen, low smoke and low halogen, Cold-resistant, water-proof, rodent-proof, termite-proof, etc. In some special occasions, cables are even required to have two or more comprehensive characteristics.

In alpine regions such as northern and western my country, the winter temperature is low, the time is long, and the temperature difference between day and night is large. For example, the lowest temperature in Xinjiang is -40℃, the lowest temperature in Ningxia is -33℃, the lowest temperature in Shanxi is -28℃, and the lowest temperature in some areas reaches -44.8℃. The low-temperature performance requirements of cables in these areas are very high, especially the cables laid outdoors must be able to withstand low temperatures of -30℃, -40℃ or -50℃, otherwise the outer sheath of the cable may become brittle and rupture at low temperature, thus Severely shorten the service life of the cable and affect the normal supply of electricity, and the cables produced in accordance with my country's national standards can only be guaranteed to be used normally at -15°C. In recent years, many customers have added cold resistance requirements to their cable technical agreements. The customer clearly stipulates that the cable must be provided in the cable technical requirements. The cold resistance index should meet the minimum operating temperature of -50 ℃, and when the temperature is not lower than -15 ℃, it can be installed without preheating. It can be seen that customers have put forward higher requirements for cold-resistant cables.

At present, the current cable product structure is polyester tape wrapped around the cable core, bare copper wire braiding, and halogen-free low-smoke flame-retardant outer sheath. The product has poor roundness, low mechanical strength of the entire cable, and often stresses during laying. The phenomenon of flattening and breaking; the cold resistance is not good, and the sheath often cracks when laying or using in severe cold and low temperature. Usually, the method of adding plasticizer is adopted to achieve the purpose of improving its cold resistance. However, small-molecular plasticizers are prone to migrate in rubber materials and will precipitate out after a period of use, while macromolecular plasticizers have poor compatibility with rubber materials and cannot significantly improve their cold resistance. .

Summary of the invention

The technical problem to be solved by the present invention is to provide a cold-resistant data transmission cable whose cold-resistant grade can reach -70°C, which can effectively solve the problems of flattening and breaking of existing products during laying and sheath cracking during laying and use in severe cold areas. problem.

In order to solve the above technical problems, the present invention provides the following technical solutions:

The present invention provides a cold-resistant data transmission cable, which includes a cable core composed of a stranded conductor and a filling rope, a cold-resistant tape layer, a cold-resistant inner jacket layer, a metal braid layer, and a cold-resistant outer layer sequentially wrapped around the cable core. Sheath; the surface of the stranded conductor is provided with an insulating layer, and the raw materials of the cold-resistant inner jacket layer and the cold-resistant outer jacket include the following components in parts by weight:

Wherein, the content of phenyl groups in the methyl vinyl phenyl silicone rubber is 5-25%, and the 1,4-polybutadiene rubber is cis 1,4-polybutadiene rubber.

Cis 1,4-polybutadiene rubber, also called butadiene rubber, has high elasticity and a glass transition temperature as low as -105°C. It is the best low-temperature resistance of general-purpose rubber; wear resistance after vulcanization , Excellent flexibility and aging resistance; and good compatibility with other rubbers, easy to use with natural rubber, neoprene rubber, nitrile rubber, etc. Methyl vinyl phenyl silicone rubber is made by introducing diphenyl siloxane link (or methyl phenyl siloxane link) into the molecular chain of vinyl silicone rubber. It has good elasticity and is resistant to aging. Excellent electrical insulation and low temperature resistance can reach -110℃.

In the present invention, cis 1,4-polybutadiene rubber and methyl vinyl phenyl silicone rubber are used together as the main body of the cable material, so that the obtained sheath material has extremely excellent low temperature resistance (can be Up to -70℃), no need to use low-temperature resistant plasticizers, which avoids the drop in cold resistance caused by the precipitation of small molecular plasticizers, and the defects of poor compatibility between macromolecular plasticizers and the rubber body.

The cis 1,4-polybutadiene rubber used in the present invention has good compatibility with other rubbers, thereby ensuring the performance of the combined use with methyl vinyl phenyl silicone rubber. At the same time, in order to further improve the compatibility between the two rubber compounds, the present invention introduces 10-30 parts of low-density polyethylene (LLDPE) into the formulation. The carbon chain structure of LLDPE itself makes it compatible with cis 1,4- Both polybutadiene rubber and methyl vinyl phenyl silicone rubber have good affinity and can be used as a compatibilizer for cis 1,4-polybutadiene rubber and methyl vinyl phenyl silicone rubber. Play a role in further improving compatibility.

Although cis 1,4-polybutadiene rubber and methyl vinyl phenyl silicone rubber have excellent elasticity and other properties, their tear strength and tensile strength are low, resulting in poor mechanical properties after combined use. LLDPE has high strength, good toughness, good environmental stress crack resistance, impact resistance, tear resistance and other properties. Incorporating it into the formula can enhance the sheath material and increase the strength of the sheath. , To prevent the cable from being crushed and broken during laying. In addition, LLDPE also has the advantage of good cold resistance, and its addition will not cause a significant decrease in the cold resistance temperature of the cable material.

In the present invention, the content of the phenyl group in the methyl vinyl phenyl silicone rubber is limited to 5-25% in order to ensure that it has good low temperature resistance and flame retardancy, as well as good processing performance. When the phenyl content is higher than 25%, the processing performance is poor, which limits the application. Preferably, the phenyl content is 5-15%, more preferably 5-10%.

Further, the cold-resistant tape layer is a PE film, a PP film or a PU film.

Further, the stranded conductor is a copper conductor; further, the metal braided layer is a copper wire braided layer.

Further, the crosslinking agent is selected from the group consisting of dicumyl peroxide, di-tert-butyl peroxide, tert-butyl dicumyl peroxide, tert-butyl peroxide isopropyl carbonate, 2,5- One or more of dimethyl-2,5-di(tert-butylperoxy)hexane is preferably dicumyl peroxide or di-tert-butyl dicumyl peroxide.

Further, the auxiliary crosslinking agent is selected from the group consisting of NN m-phenylene bismaleimide, triallyl isocyanurate, triallyl trimer isocyanurate and vinyl dimethacrylate One or more of them, preferably triallyl isocyanurate (TAIC).

Further, the anti-aging agent is selected from one or more of anti-aging agent D, anti-aging agent MB, and anti-aging agent DNP.

Further, the raw materials of the cold-resistant inner jacket layer and the cold-resistant outer jacket further include 1-5 parts of inorganic reinforcing filler;

The inorganic reinforcing filler can be selected from one or more of silica, calcium carbonate, talc, barium sulfate, diatomaceous earth, and mica powder, and is preferably silica.

Further, the raw materials of the cold-resistant inner sheath layer and the cold-resistant outer sheath further include 3-8 parts of flame retardant;

The flame retardant may be an inorganic flame retardant and/or a phosphorus flame retardant and/or a nitrogen flame retardant;

The inorganic flame retardant can be selected from one or a combination of at least two of magnesium hydroxide, aluminum hydroxide, and antimony trioxide;

The phosphorus-based flame retardant may be selected from one or a combination of at least two of phosphate, hypophosphite, hypophosphite, phenyl hypophosphite, dialkyl hypophosphite, and ammonium polyphosphate;

The nitrogen-based flame retardant may be selected from one or a combination of at least two of melamine, dicyandiamide, melamine cyanurate, and melamine polyphosphate.

Further, in order to improve the dispersibility of the inorganic flame retardant in the rubber body, it is preferable that the raw materials of the cold-resistant inner sheath layer and the cold-resistant outer sheath further include 0.5-1 parts of coupling agent.

The coupling agent may be a silane coupling agent, a titanate coupling agent or an aluminate coupling agent. Preferably, the coupling agent is a silane coupling agent, which can not only improve the dispersibility of the inorganic flame retardant in the rubber body, but also the siloxane group in the molecule has good properties with the methyl vinyl phenyl silicone rubber. The organic functional group has affinity with cis 1,4-polybutadiene rubber, so it can enhance the compatibility of the two rubber compounds to a certain extent.

Further, the cold-resistant grade of the cold-resistant inner jacket layer and the cold-resistant outer jacket reaches -70°C.

Further, the raw materials of the cold-resistant inner jacket layer and the cold-resistant outer jacket can be prepared by the following steps:

Add the raw materials to the mixer according to the proportion, mix at 55℃-70℃ for 5-20min, then transfer the mixed mixture to the twin-screw extruder, carry out at 180-220℃ Extrusion granulation.

Compared with the prior art, the present invention has the following beneficial effects:

1. In the cold-resistant data transmission cable of the present invention, the raw materials of the cold-resistant inner sheath and the cold-resistant outer sheath are made of cis 1,4-polybutadiene rubber and methyl vinyl phenyl silicone rubber. The combination of its excellent rubber material, combined with low-density linear polyethylene and other additives, can reach a cold-resistant grade of -70°C without using any cold-resistant plasticizer.

2. The cold-resistant data transmission cable of the present invention has the characteristics of a round structure, high strength, and high cold resistance, and the product's cold resistance level can reach -70℃, which effectively solves the problem of flattening, breaking and laying in severe cold areas when the existing products are laid. , The use of sheath cracking is helpful to improve the data transmission performance of the product; the cable can be used in the railway system to ensure the safety of railway trains and reduce the maintenance cost of the railway system.

Description of the drawings

Figure 1 is a schematic cross-sectional structure diagram of the cold-resistant data transmission cable of the present invention;

Among them: 1. Stranded copper conductor; 2. Insulation layer; 3. Cold-resistant tape layer; 4. Cold-resistant inner sheath layer; 5. Copper wire braid layer; 6. Cold-resistant sheath layer; 7. Filling rope.

Detailed ways

The present invention will be further described below in conjunction with specific examples, so that those skilled in the art can better understand and implement the present invention, but the examples cited are not intended to limit the present invention.

Example 1

Referring to Figure 1, this embodiment provides a cold-resistant data transmission cable, which includes a cable core composed of a stranded copper conductor 1 and a filler rope 7, a cold-resistant tape layer 3 that is sequentially wrapped on the outside of the cable core, and a cold-resistant inner jacket layer 4. Copper wire braided layer 5 and cold-resistant outer sheath 6; among them, the stranded copper conductor 1 is provided with an insulating layer 2 on the surface, the cold-resistant tape layer 3 is a PE film, and the cold-resistant inner sheath layer 4 and the cold-resistant outer sheath 6 are raw materials Including the following components in parts by weight:

Wherein, the content of phenyl groups in the methyl vinyl phenyl silicone rubber is 5-10%.

The preparation process of the above-mentioned cold-resistant inner jacket layer and cold-resistant outer jacket raw materials is as follows:

Silane coupling agent is used to couple silica and magnesium hydroxide, and then the coupled silica and magnesium hydroxide are added to the open mill together with other components, and mixed at 60°C for 20 minutes, then The mixed material is transferred to a twin-screw extruder, and extruded and granulated at 180-220°C.

Example 2

This embodiment provides a cold-resistant data transmission cable, including a cable core composed of a twisted copper conductor and a filler rope, a cold-resistant tape layer sequentially wrapped on the outside of the cable core, a cold-resistant inner jacket layer, a copper wire braided layer, and a cold-resistant cable core. Outer sheath; wherein the surface of the stranded copper conductor is provided with an insulating layer, the cold-resistant tape layer is a PP film, and the raw materials of the cold-resistant inner sheath layer and the cold-resistant outer sheath include the following components by weight:

Wherein, the content of phenyl groups in the methyl vinyl phenyl silicone rubber is 5-10%.

The preparation process of the above-mentioned cold-resistant inner jacket layer and cold-resistant outer jacket raw materials is as follows:

Silane coupling agent is used to couple silica and magnesium hydroxide, and then the coupled silica and magnesium hydroxide are added to the open mill together with other components, and mixed at 60°C for 20 minutes, then The mixed material is transferred to a twin-screw extruder, and extruded and granulated at 180-220°C.

Example 3

This embodiment provides a cold-resistant data transmission cable, including a cable core composed of a twisted copper conductor and a filler rope, a cold-resistant tape layer sequentially wrapped on the outside of the cable core, a cold-resistant inner jacket layer, a copper wire braided layer, and a cold-resistant cable core. Outer sheath; among them, the surface of the stranded copper conductor is provided with an insulating layer, the cold-resistant tape layer is a PU film, and the raw materials of the cold-resistant inner sheath layer and the cold-resistant outer sheath include the following components by weight:

Wherein, the content of phenyl groups in the methyl vinyl phenyl silicone rubber is 5-10%.

The preparation process of the above-mentioned cold-resistant inner jacket layer and cold-resistant outer jacket raw materials is as follows:

Silane coupling agent is used to couple silica and magnesium hydroxide, and then the coupled silica and magnesium hydroxide are added to the open mill together with other components, and mixed at 60°C for 20 minutes, then The mixed material is transferred to a twin-screw extruder, and extruded and granulated at 180-220°C.

Example 4

This embodiment provides a cold-resistant data transmission cable, including a cable core composed of a twisted copper conductor and a filler rope, a cold-resistant tape layer sequentially wrapped on the outside of the cable core, a cold-resistant inner jacket layer, a copper wire braided layer, and a cold-resistant cable core. Outer sheath; wherein the surface of the stranded copper conductor is provided with an insulating layer, the cold-resistant tape layer is a PE film, and the raw materials of the cold-resistant inner sheath layer and the cold-resistant outer sheath include the following components by weight:

Wherein, the content of phenyl groups in the methyl vinyl phenyl silicone rubber is 5-10%.

The preparation process of the above-mentioned cold-resistant inner jacket layer and cold-resistant outer jacket raw materials is as follows:

Silane coupling agent is used to couple silica and magnesium hydroxide, and then the coupled silica and magnesium hydroxide are added to the open mill together with other components, and mixed at 60°C for 20 minutes, then The mixed material is transferred to a twin-screw extruder, and extruded and granulated at 180-220°C.

Example 5

This embodiment provides a cold-resistant data transmission cable, including a cable core composed of a twisted copper conductor and a filler rope, a cold-resistant tape layer sequentially wrapped on the outside of the cable core, a cold-resistant inner jacket layer, a copper wire braided layer, and a cold-resistant cable core. Outer sheath; wherein the surface of the stranded copper conductor is provided with an insulating layer, the cold-resistant tape layer is a PE film, and the raw materials of the cold-resistant inner sheath layer and the cold-resistant outer sheath include the following components by weight:

Wherein, the content of phenyl groups in the methyl vinyl phenyl silicone rubber is 5-10%.

The preparation process of the above-mentioned cold-resistant inner jacket layer and cold-resistant outer jacket raw materials is as follows:

Silane coupling agent is used to couple silica and magnesium hydroxide, and then the coupled silica and magnesium hydroxide are added to the open mill together with other components, and mixed at 60°C for 20 minutes, then The mixed material is transferred to a twin-screw extruder, and extruded and granulated at 180-220°C.

According to GB/T 531.1-2008, GB/T528-2009, HG/T 3866-2008, UL94-2003 standards, respectively, the Shore hardness, For tensile properties, cold resistance and flame retardancy, the test results are shown in Table 1 below.

The above-mentioned embodiments are only preferred embodiments for fully explaining the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or alterations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims (9)

1. A cold-resistant data transmission cable, which is characterized by comprising a cable core composed of a stranded conductor and a filling rope, a cold-resistant tape layer, a cold-resistant inner jacket layer, a metal braid layer, and a cold-resistant outer layer sequentially wrapped around the cable core. Sheath; the surface of the stranded conductor is provided with an insulating layer, and the raw materials of the cold-resistant inner jacket layer and the cold-resistant outer jacket include the following components in parts by weight:

   

   Wherein, the content of phenyl groups in the methyl vinyl phenyl silicone rubber is 5-25%, and the 1,4-polybutadiene rubber is cis 1,4-polybutadiene rubber.
2. The cold-resistant data transmission cable according to claim 1, wherein the cold-resistant coating layer is a PE film, a PP film or a PU film.
3. The cold-resistant data transmission cable according to claim 1, wherein the crosslinking agent is selected from the group consisting of dicumyl peroxide, di-tert-butyl peroxide, and tert-butyl dicumyl peroxide. , One or more of tert-butylperoxyisopropyl carbonate, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane.
4. The cold-resistant data transmission cable according to claim 1, wherein the auxiliary crosslinking agent is selected from the group consisting of NN m-phenylene bismaleimide, triallyl isocyanurate, triene One or more of propyl isocyanurate and vinyl dimethacrylate.
5. The cold-resistant data transmission cable according to claim 1, wherein the antioxidant is selected from one or more of antioxidant D, antioxidant MB, and antioxidant DNP.
6. The cold-resistant data transmission cable according to claim 1, wherein the raw material further comprises 1-5 parts of inorganic reinforcing filler;

   The inorganic reinforcing filler is selected from one or more of white carbon black, calcium carbonate, talc, barium sulfate, diatomaceous earth, and mica powder.
7. The cold-resistant data transmission cable according to claim 1, wherein the raw material further comprises 3-8 parts of flame retardant;

   The flame retardant is an inorganic flame retardant and/or a phosphorus flame retardant and/or a nitrogen flame retardant;

   The inorganic flame retardant is selected from one or a combination of at least two of magnesium hydroxide, aluminum hydroxide, and antimony trioxide;

   The phosphorus-based flame retardant is selected from one or a combination of at least two of phosphate, hypophosphite, hypophosphite, phenyl hypophosphite, dialkyl hypophosphite, and ammonium polyphosphate;

   The nitrogen-based flame retardant is selected from one or a combination of at least two of melamine, dicyandiamide, melamine cyanurate, and melamine polyphosphate.
8. The cold-resistant data transmission cable according to claim 1, wherein the raw material further comprises 0.5-1 part of coupling agent;

   The coupling agent is a silane coupling agent, a titanate coupling agent or an aluminate coupling agent.
9. The cold-resistant data transmission cable according to claim 1, wherein the cold-resistant grade of the cold-resistant inner sheath and the cold-resistant outer sheath reaches -70°C.

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