Highly-flame-retardant class-b1 cable for digital communication, and preparation method therefor

Abstract

Disclosed in the present invention are a highly-flame-retardant class-B1 cable for digital communication, and a preparation method therefor. The highly-flame-retardant class-B1 cable for digital communication comprises a first low-smoke flame-retardant sheath, wherein an insulating layer is fixedly connected to an inner wall of the first low-smoke flame-retardant sheath, a first shielding layer is fixedly connected to an inner wall of the insulating layer, a heat-insulating layer is fixedly connected to an inner wall of a second shielding layer, a reinforcing layer is fixedly connected to an inner wall of the heat-insulating layer, a second rubber buffer layer is provided in an inner cavity of a first rubber buffer layer, and a second low-smoke flame-retardant sheath is fixedly connected to an inner wall of the second rubber buffer layer. In the highly-flame-retardant class-B1 cable for digital communication and the preparation method therefor in the present invention, the prepared low-smoke flame-retardant sheath uses CR as a raw material, and thus has excellent flame retardance, heat resistance, weather resistance, ozone resistance, light resistance, wear resistance, oil resistance and a unique non-flame-propagation property and is also less costly; therefore, the prepared cable has relatively good flame retardance, heat resistance, weather resistance, ozone resistance, light resistance and wear resistance.

Description

A highly flame-retardant B1-level digital communication cable and its preparation method Technical Field

[0001] The present invention relates to the field of preparation of communication cables, and in particular to a highly flame-retardant B1-level digital communication cable and a preparation method thereof. Background Art

[0002] Communication cables are cables used to transmit telephone, telegraph, fax documents, television and radio programs, data and other electrical signals. They are made up of one or more insulated conductors twisted together. Compared with overhead wires, communication cables have the advantages of large communication capacity, high transmission stability, good confidentiality, and less influence from natural conditions and external interference.

[0003] The raw materials of existing communication cables are mostly ordinary plastic materials, resulting in insufficient overall flame retardancy, heat resistance, weather resistance, ozone resistance, light resistance, wear resistance, and oil resistance. At the same time, when encountering high temperatures, they cannot absorb heat well and cannot provide good protection for the wires inside. At the same time, their preparation cost is high, and a large amount of toxic gases will be emitted during preparation.

[0004] Therefore, it is necessary to propose a highly flame-retardant B1-level digital communication cable and a preparation method thereof to solve the above problems.

[0005] Summary of the Invention

[0006] The main purpose of the present invention is to provide a highly flame-retardant B1-level digital communication cable and a preparation method thereof, which can effectively solve the problems in the background technology.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A highly flame-retardant B1 grade digital communication cable comprises a first low-smoke flame-retardant sheath, an insulating layer fixedly connected to the inner wall of the first low-smoke flame-retardant sheath, a first shielding layer fixedly connected to the inner wall of the insulating layer, a second shielding layer fixedly connected to the inner wall of the first shielding layer, a thermal insulation layer fixedly connected to the inner wall of the second shielding layer, a reinforcing layer fixedly connected to the inner wall of the thermal insulation layer, a first rubber buffer layer fixedly connected to the inner wall of the reinforcing layer, a second rubber buffer layer provided in the inner cavity of the first rubber buffer layer, a second low-smoke flame-retardant sheath fixedly connected to the inner wall of the second rubber buffer layer, and a wire fixedly connected to the inner cavity of the second low-smoke flame-retardant sheath.

[0009] Preferably, a hollow groove is provided on one side of the first rubber buffer layer and the second rubber buffer layer opposite to each other, and the inner cavity of the hollow groove is filled with a carbon fiber filling layer.

[0010] Preferably, there are four wires, and the inner cavity of the second low-smoke flame-retardant sheath is filled with a fire-proof putty filling layer, and the fire-proof putty filling layer is in contact with the wires.

[0011] A method for preparing a highly flame-retardant B1-level digital communication cable comprises the following steps:

[0012] S1: Preparation of low smoke flame retardant sheath: including: 100 parts of CR, 120 parts of magnesium hydroxide and aluminum hydroxide, 13 parts of antimony trioxide and molybdenum trioxide, 20 parts of light calcium carbonate, 5 parts of paraffin, 2 parts of plasticizer DOP, antioxidant HW-011, accelerator TMTD1, accelerator DM1, accelerator NA-221, 5 parts of zinc oxide, CR is mixed in an internal mixer according to the proportion, and the mixing time is continued for 10-12 minutes before adding the material, 120 parts of magnesium hydroxide and aluminum hydroxide, 13 parts of antimony trioxide and molybdenum trioxide, 20 parts of light calcium carbonate, 5 parts of Parts of paraffin, 2 parts of plasticizer DOP, and antioxidant HW-011 are sequentially added to the internal mixer for mixing. After mixing for 15 minutes, discharge is carried out. The temperature during discharge needs to be at 100 degrees. After the discharge, secondary mixing is carried out, and accelerator TMTD1, accelerator DM1, accelerator NA-221, and 5 parts of zinc oxide are added. After 15 minutes, discharge is carried out again. The discharge temperature needs to be at 105 degrees. After the discharge, the mixed material is introduced into the extruder for extrusion. The size of the extruded material is prepared into the size of the first low-smoke flame retardant sheath and the second low-smoke flame retardant sheath;

[0013] S2: The insulation layer is made of polyethylene material, which is prepared into corresponding sizes and placed aside;

[0014] S3: The material of the first shielding layer is silver-plated copper wire, and the material of the second shielding layer is galvanized steel wire. The silver-plated copper wire and the galvanized steel wire are prepared into corresponding sizes and placed aside;

[0015] S4: The thermal insulation layer is mainly made of acrylic emulsion water-based material, to which fire retardants and plasticizers are added to form a thermal insulation layer;

[0016] S6: The reinforcement layer is made of nylon material, which is woven into a loop and placed aside;

[0017] S7: The first rubber buffer layer and the second rubber buffer layer are made of chlorinated polyethylene rubber, which are prepared into corresponding sizes. Carbon fiber is filled between the first rubber buffer layer and the second rubber buffer layer to form a carbon fiber filling layer, which is placed aside for later use.

[0018] S8: Fireproof mortar filling layer is made by mixing butyl rubber, aluminum hydroxide, magnesium hydroxide and liquid polybutene;

[0019] S9: Install the wire into the prepared inner cavity of the second low-smoke flame-retardant sheath by conventional means, fill the fireproof putty filling layer into the remaining space in the inner cavity of the second low-smoke flame-retardant sheath, adhere and fix the second rubber buffer layer to the outer wall of the second low-smoke flame-retardant sheath, and install the prepared reinforcement layer, thermal insulation layer, second shielding layer, first shielding layer, insulation layer and first low-smoke flame-retardant sheath on the outer wall of the first rubber buffer layer to form a highly flame-retardant B1 grade digital communication cable. Beneficial effects

[0020] Compared with the prior art, the present invention provides a highly flame-retardant B1-level digital communication cable and a preparation method thereof, which has the following beneficial effects:

[0021] 1. The highly flame-retardant B1-level digital communication cable and its preparation method, through the preparation of the low-smoke flame-retardant sheath, which uses CR as raw material, has excellent flame retardancy, heat resistance, weather resistance, ozone resistance, light resistance, wear resistance, oil resistance and unique non-flammability performance, while the price is relatively low. In the preparation of the sheath, since CR releases a large amount of hydrogen chloride gas when burned, magnesium hydroxide, aluminum hydroxide, antimony trioxide, and molybdenum trioxide system are used as the flame retardant and smoke suppression system. This is because magnesium hydroxide and aluminum hydroxide, in addition to releasing crystal water when heated, absorb a large amount of heat and play a flame retardant role, can also absorb Hydrogen chloride is collected and reacted with it to form a stable compound. Antimony trioxide and molybdenum trioxide react with hydrogen chloride to generate not only water and compounds that promote carbonization of the polymer surface, but also compounds that cover the polymer surface and can cut off the polymer's contact with oxygen. At the same time, magnesium hydroxide and aluminum hydroxide, antimony trioxide and molybdenum trioxide have synergistic effects respectively. By adding light calcium carbonate, the cost of the rubber compound can be reduced, and the extrusion performance of the rubber compound mixing process can be improved, thereby reducing the release of hydrogen chloride, so that the prepared cable has better flame retardancy, heat resistance, weather resistance, ozone resistance, light resistance and wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic structural diagram of the front side of the present invention;

[0023] FIG2 is an enlarged view of point A in FIG1 of the present invention.

[0024] In the figure: 1. First low-smoke flame-retardant sheath; 2. Insulation layer; 3. First shielding layer; 4. Second shielding layer; 5. Thermal insulation layer; 6. Reinforcement layer; 7. First rubber buffer layer; 8. Carbon fiber filling layer; 9. Second rubber buffer layer; 10. Second low-smoke flame-retardant sheath; 11. Conductor; 12. Fireproof putty filling layer. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0026] Specific embodiment one:

[0027] As shown in Figure 1-2, a highly flame-retardant B1-level digital communication cable comprises a first low-smoke flame-retardant sheath 1, an insulating layer 2 is fixedly connected to the inner wall of the first low-smoke flame-retardant sheath 1, a first shielding layer 3 is fixedly connected to the inner wall of the insulating layer 2, a second shielding layer 4 is fixedly connected to the inner wall of the first shielding layer 3, a heat-insulating layer 5 is fixedly connected to the inner wall of the second shielding layer 4, a reinforcing layer 6 is fixedly connected to the inner wall of the heat-insulating layer 5, a first rubber buffer layer 7 is fixedly connected to the inner wall of the reinforcing layer 6, and the first rubber buffer layer 7 is fixedly connected to the inner wall of the first rubber buffer layer 7. A second rubber buffer layer 9 is provided in the inner cavity, a second low-smoke flame retardant sheath 10 is fixedly connected to the inner wall of the second rubber buffer layer 9, a wire 11 is fixedly connected to the inner cavity of the second low-smoke flame retardant sheath 10, an empty groove is opened on the opposite side of the first rubber buffer layer 7 and the second rubber buffer layer 9, the inner cavity of the empty groove is filled with a carbon fiber filling layer 8, there are four wires 11, and the inner cavity of the second low-smoke flame retardant sheath 10 is filled with a fireproof putty filling layer 12, and the fireproof putty filling layer 12 is in contact with the wire 11.

[0028] Specific embodiment two:

[0029] As shown in Figure 1-2, a method for preparing a highly flame-retardant B1-grade digital communication cable includes the following steps:

[0030] S1: Preparation of low smoke flame retardant sheath: including: 100 parts of CR, 120 parts of magnesium hydroxide and aluminum hydroxide, 13 parts of antimony trioxide and molybdenum trioxide, 20 parts of light calcium carbonate, 5 parts of paraffin, 2 parts of plasticizer DOP, antioxidant HW-011, accelerator TMTD1, accelerator DM1, accelerator NA-221, 5 parts of zinc oxide, CR is mixed in an internal mixer according to the proportion, and the mixing time is continued for 10-12 minutes before adding the material, 120 parts of magnesium hydroxide and aluminum hydroxide, 13 parts of antimony trioxide and molybdenum trioxide, 20 parts of light calcium carbonate, 5 parts of paraffin, 2 parts of plasticizer DOP, and antioxidant HW-011 are added to the internal mixer in sequence for mixing. After mixing for 15 minutes, discharge is carried out. The temperature during discharge needs to be at 100 degrees. After the discharge is completed, a second mixing is carried out, and accelerator TMTD1, accelerator DM1, accelerator NA-221, and 5 parts of zinc oxide are added. After 15 minutes, the discharge is carried out again. The discharge temperature needs to be at 105 degrees. After the discharge is completed, the mixed material is introduced into the extruder for extrusion. The size of the extruded material is prepared into the size of the first low-smoke flame retardant sheath 1 and the second low-smoke flame retardant sheath 10.

[0031] S2: The insulating layer 2 is made of polyethylene material and is prepared into corresponding sizes and placed for use.

[0032] S3: The material of the first shielding layer 3 is silver-plated copper wire, and the material of the second shielding layer 4 is galvanized steel wire. The silver-plated copper wire and the galvanized steel wire are prepared into corresponding sizes and placed aside.

[0033] S4: The heat insulation layer 5 is mainly made of acrylic emulsion water-based material, to which fire retardant and plasticizer are added to form the heat insulation layer 5.

[0034] S6: The reinforcement layer 6 is made of nylon material, which is woven into a loop and placed aside.

[0035] S7: The first rubber buffer layer 7 and the second rubber buffer layer 9 are made of chlorinated polyethylene rubber, which are prepared into corresponding sizes. Carbon fibers are filled between the first rubber buffer layer 7 and the second rubber buffer layer 9 to form a carbon fiber filling layer 8, which is placed aside for later use.

[0036] S8: Fireproof mortar filling layer 12 is formed by mixing butyl rubber, aluminum hydroxide, magnesium hydroxide and liquid polybutene.

[0037] S9: Install the conductor 11 into the inner cavity of the prepared second low-smoke flame-retardant sheath 10 by conventional means, fill the fireproof putty filling layer 12 into the remaining space in the inner cavity of the second low-smoke flame-retardant sheath 10, adhere and fix the second rubber buffer layer 9 to the outer wall of the second low-smoke flame-retardant sheath 10, and install the prepared reinforcement layer 6, thermal insulation layer 5, second shielding layer 4, first shielding layer 3, insulation layer 2 and first low-smoke flame-retardant sheath 1 on the outer wall of the first rubber buffer layer 7 to form a highly flame-retardant B1 grade digital communication cable.

[0038] Specific embodiment three:

[0039] The following tests were conducted on the prepared high flame retardant B1 grade digital communication cables and normal cables:

[0040] It can be seen that the prepared high flame retardant B1 grade digital communication cable has good strength, flame retardancy and low smoke effects.

[0041] The low-smoke flame-retardant sheath prepared by using CR as raw material has excellent flame retardancy, heat resistance, weather resistance, ozone resistance, light resistance, wear resistance, oil resistance and unique non-flammability performance, and the price is relatively low. In the preparation of the sheath, considering that CR will release a large amount of hydrogen chloride gas when burned, magnesium hydroxide, aluminum hydroxide, antimony trioxide and molybdenum trioxide system are used as flame retardant and smoke suppression system. This is because magnesium hydroxide and aluminum hydroxide can not only release crystal water when heated, absorb a large amount of heat and play a flame retardant role, but also absorb hydrogen chloride and react with it to generate stable The reaction of antimony trioxide and molybdenum trioxide with hydrogen chloride not only generates water and compounds that promote carbonization of the polymer surface, but also generates compounds that cover the polymer surface and can cut off the polymer's contact with oxygen. At the same time, magnesium hydroxide and aluminum hydroxide, antimony trioxide and molybdenum trioxide have synergistic effects. By adding light calcium carbonate, the cost of the rubber compound can be reduced, and the extrusion performance of the rubber compound mixing process can be improved, thereby reducing the release of hydrogen chloride, so that the prepared cable has better flame retardancy, heat resistance, weather resistance, ozone resistance, light resistance and wear resistance.

[0042] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications are possible without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A highly flame-retardant B1-level digital communication cable, comprising a first low-smoke flame-retardant sheath (1), characterized in that: The inner wall of the first low-smoke flame-retardant sheath (1) is fixedly connected to an insulating layer (2), the inner wall of the insulating layer (2) is fixedly connected to a first shielding layer (3), the inner wall of the first shielding layer (3) is fixedly connected to a second shielding layer (4), the inner wall of the second shielding layer (4) is fixedly connected to a heat insulation layer (5), the inner wall of the heat insulation layer (5) is fixedly connected to a reinforcing layer (6), the inner wall of the reinforcing layer (6) is fixedly connected to a first rubber buffer layer (7), a second rubber buffer layer (9) is arranged in the inner cavity of the first rubber buffer layer (7), a second low-smoke flame-retardant sheath (10) is fixedly connected in the inner wall of the second rubber buffer layer (9), and a wire (11) is fixedly connected in the inner cavity of the second low-smoke flame-retardant sheath (10).

2. A highly flame-retardant B1-level digital communication cable according to claim 1, characterized in that: A hollow groove is provided on one side of the first rubber buffer layer (7) and the second rubber buffer layer (9) opposite to each other, and the inner cavity of the hollow groove is filled with a carbon fiber filling layer (8).

3. A highly flame-retardant B1-level digital communication cable according to claim 1, characterized in that: There are four conductors (11), and the inner cavity of the second low-smoke flame-retardant sheath (10) is filled with a fireproofing clay filling layer (12), and the fireproofing clay filling layer (12) is in contact with the conductors (11).

4. The method for preparing a highly flame-retardant B1-level digital communication cable according to claim 1, characterized in that: The steps include: S1: Preparation of low-smoke flame-retardant sheath: including: 100 parts of CR, 120 parts of magnesium hydroxide and aluminum hydroxide, 13 parts of antimony trioxide and molybdenum trioxide, 20 parts of light calcium carbonate, 5 parts of paraffin, 2 parts of plasticizer DOP, antioxidant HW-011, accelerator TMTD1, accelerator DM1, accelerator NA-221, 5 parts of zinc oxide, CR is mixed in the internal mixer according to the proportion, and the mixing time lasts for 10-12 minutes before adding the materials, 120 parts of magnesium hydroxide and aluminum hydroxide, 13 parts of antimony trioxide and molybdenum trioxide, 20 parts of light calcium carbonate, 5 parts of paraffin, 2 parts of plasticizer DOP, antioxidant HW-011 are added to the internal mixer in sequence for mixing, and the mixing lasts for 15 minutes before discharging. The temperature during discharging needs to be at 100 degrees. After the discharging is completed, secondary mixing is carried out, and accelerator TMTD1 and accelerator DM1 are added. DM1, accelerator NA-221, and 5 parts of zinc oxide are added for 15 minutes and then discharged again. The discharge temperature needs to be at 105 degrees. After the discharge is completed, the mixed material is introduced into the extruder for extrusion. The size of the extruded material is prepared into the size of the first low-smoke flame-retardant sheath (1) and the second low-smoke flame-retardant sheath (10); S2: The insulating layer (2) is made of polyethylene material and is prepared into corresponding sizes and placed for standby use; S3: The material of the first shielding layer (3) is silver-plated copper wire, and the material of the second shielding layer (4) is galvanized steel wire. The silver-plated copper wire and the galvanized steel wire are prepared into corresponding sizes and placed aside for use; S4: The heat insulation layer (5) is mainly made of acrylic emulsion water-based material, to which fire retardant and plasticizer are added to form the heat insulation layer (5); S6: The reinforcement layer (6) is made of nylon material, woven into a loop and placed aside for later use; S7: The first rubber buffer layer (7) and the second rubber buffer layer (9) are made of chlorinated polyethylene rubber, which are prepared into corresponding sizes, and carbon fiber is filled between the first rubber buffer layer (7) and the second rubber buffer layer (9) to form a carbon fiber filling layer (8), which is placed for standby use; S8: Fireproofing clay filling layer (12) is formed by mixing butyl rubber, aluminum hydroxide, magnesium hydroxide and liquid polybutene; S9: Install the conductor (11) into the inner cavity of the prepared second low-smoke flame-retardant sheath (10) by conventional means, fill the fireproof putty filling layer (12) into the remaining space in the inner cavity of the second low-smoke flame-retardant sheath (10), adhere the second rubber buffer layer (9) to the outer wall of the second low-smoke flame-retardant sheath (10), and install the prepared reinforcement layer (6), thermal insulation layer (5), second shielding layer (4), first shielding layer (3), insulation layer (2) and first low-smoke flame-retardant sheath (1) on the outer wall of the first rubber buffer layer (7), thereby forming a highly flame-retardant B1 grade digital communication cable.

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