An overhead insulated cable

Abstract

The present invention relates to the field of cable technology, and proposes an overhead insulated cable, which is composed of a conductor, a shielding layer, an insulating layer, and a protective layer from the inside to the outside; the conductor is composed of an inner core layer and an outer core layer from the inside to the outside, the inner core layer is composed of seven wires of equal diameter, and the outer core layer is composed of twelve wires of equal diameter; the protective layer is composed of the following raw materials by weight: 100 parts of PVC resin, 15-20 parts of plasticizer, 12-16 parts of inorganic flame retardant, 10-12 parts of inorganic filler, 1-2 parts of cross-linking agent, 4-6 parts of reinforcing modifier, 0.5-1.5 parts of antioxidant; the reinforcing modifier is diaminodiphenyl sulfone and / or 4-aminobenzyl diethyl phosphate. Through the above technical scheme, the problems of low flame retardancy and poor mechanical properties of overhead insulated cables in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to an overhead insulated cable. Background Art

[0002] Cables are products that transmit electrical energy, and are used to transmit electrical energy from generators to AC power grids. Cables can be divided into bare copper wires, power cables, overhead insulated cables, control cables, and special cables. Overhead insulated cables are often used in places such as electric poles and electric towers because of their small size, light weight, and easy installation and maintenance. The flame retardant properties of cables are very important. Cables with good flame retardancy can delay the spread of flames under certain conditions, preventing the fire from expanding and improving the fire protection level of cable lines. In addition, due to the special laying environment and importance of overhead insulated cables, higher requirements are placed on their flame retardant properties. Summary of the invention

[0003] The invention provides an overhead insulated cable, which solves the problems of low flame retardancy and poor mechanical properties of the overhead insulated cable in the related art.

[0004] The technical solution of the present invention is as follows:

[0005] The invention provides an overhead insulated cable, which comprises a conductor, a shielding layer, an insulating layer and a protective layer from the inside to the outside; the conductor comprises an inner core layer and an outer core layer from the inside to the outside, the inner core layer is composed of seven wires with equal diameters, and the outer core layer is composed of twelve wires with equal diameters; the protective layer is composed of the following raw materials in parts by weight: 100 parts of PVC resin, 15-20 parts of plasticizer, 12-16 parts of inorganic flame retardant, 10-12 parts of inorganic filler, 1-2 parts of cross-linking agent, 4-6 parts of reinforcing modifier, and 0.5-1.5 parts of antioxidant; the reinforcing modifier is diaminodiphenyl sulfone and / or 4-aminobenzyl diethyl phosphate.

[0006] In the present invention, both diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate can improve the tensile strength and elongation at break of the protective layer.

[0007] As a further technical solution, when the reinforcing modifier is composed of diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate, the mass ratio of diaminodiphenyl sulfone to 4-aminobenzyl diethyl phosphate is 1:1-4.

[0008] When the reinforcing modifier is composed of diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate, it can not only further improve the tensile strength and elongation at break of the protective layer of the overhead insulated cable, but also further improve the oxygen index of the protective layer of the insulating cable.

[0009] As a further technical solution, the mass ratio of diaminodiphenyl sulfone to 4-aminobenzyl diethyl phosphate is 1:3.

[0010] As a further technical solution, the material of the insulating layer is PVC resin.

[0011] As a further technical solution, the shielding layer is a metal shielding layer.

[0012] As a further technical solution, the wires are all aluminum alloy wires.

[0013] As a further technical solution, the plasticizer includes one or more of DOP plasticizer, DIDP plasticizer and DEHP plasticizer.

[0014] As a further technical solution, the cross-linking agent includes one of triallyl isocyanurate and triallyl isocyanurate.

[0015] As a further technical solution, the antioxidant includes one or more of antioxidant 1076, antioxidant 168 and antioxidant 1010.

[0016] As a further technical solution, the inorganic flame retardant includes one or both of magnesium hydroxide and aluminum hydroxide.

[0017] As a further technical solution, the particle size of the inorganic flame retardant is 325 mesh.

[0018] As a further technical solution, the inorganic filler includes one or more of white carbon black, talc and attapulgite.

[0019] As a further technical solution, the particle size of the inorganic filler is 325 mesh.

[0020] The present invention provides a method for preparing an overhead insulated cable, comprising the following steps:

[0021] S1. After the shielding layer is covered on the outside of the conductor, a shielding layer is formed;

[0022] S2, extruding the insulating layer material outside the shielding layer to obtain a semi-finished overhead insulated cable;

[0023] S3. Extruding the protective layer raw material onto the semi-finished cable to obtain an overhead insulated cable.

[0024] The working principle and beneficial effects of the present invention are:

[0025] The overhead insulated cable of the present invention comprises a conductor, a shielding layer, an insulating layer and a protective layer from the inside to the outside. The shielding layer can shield the electromagnetic field generated in the cable and protect the surrounding components; the insulating layer can prevent current leakage, and the protective layer can play a role of flame retardancy and protect the cable from the external environment and damage. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the following embodiments and comparative examples:

[0028] The insulation layer material is PVC resin;

[0029] The PVC resin in the insulation layer and the protective layer is the same, model S-700, manufacturer Sinopec;

[0030] The conductor is composed of an inner core layer and an outer core layer from the inside to the outside. The inner core layer is composed of seven aluminum alloy wires with equal diameters, and the outer core layer is composed of twelve aluminum alloy wires with equal diameters.

[0031] Example 1

[0032] A method for preparing an overhead insulated cable comprises the following steps:

[0033] S1. Wrap the copper tape braided shielding layer around the conductor to form a shielding layer;

[0034] S2, extruding the insulating layer material outside the shielding layer to obtain a semi-finished overhead insulated cable;

[0035] S3. 100 parts of PVC resin, 15 parts of DOP plasticizer, 12 parts of magnesium hydroxide (325 mesh), 10 parts of white carbon black (325 mesh), 1 part of triallyl isocyanurate, 0.5 parts of diaminodiphenyl sulfone, 3.5 parts of 4-aminobenzyl diethyl phosphate and 0.5 parts of antioxidant 1010 are extruded onto the cable semi-finished product to obtain an overhead insulated cable.

[0036] Example 2

[0037] A method for preparing an overhead insulated cable comprises the following steps:

[0038] S1. Wrap the copper tape braided shielding layer around the conductor to form a shielding layer;

[0039] S2, extruding the insulating layer material outside the shielding layer to obtain a semi-finished overhead insulated cable;

[0040] S3. 100 parts of PVC resin, 17 parts of DIDP plasticizer, 15 parts of aluminum hydroxide (325 mesh), 11 parts of talc (325 mesh), 1.5 parts of triallyl isocyanurate, 0.6 parts of diaminodiphenyl sulfone, 4.4 parts of 4-aminobenzyl diethyl phosphate and 1 part of antioxidant 1076 are extruded onto the cable semi-finished product to obtain an overhead insulated cable.

[0041] Example 3

[0042] A method for preparing an overhead insulated cable comprises the following steps:

[0043] S1. Wrap the copper tape braided shielding layer around the conductor to form a shielding layer;

[0044] S2, extruding the insulating layer material outside the shielding layer to obtain a semi-finished overhead insulated cable;

[0045] S3. 100 parts of PVC resin, 20 parts of DEHP plasticizer, 16 parts of aluminum hydroxide (325 mesh), 12 parts of attapulgite (325 mesh), 2 parts of triallyl isocyanurate, 0.75 parts of diaminodiphenyl sulfone, 5.25 parts of 4-aminobenzyl diethyl phosphate and 1.5 parts of antioxidant 168 are extruded onto the cable semi-finished product to obtain an overhead insulated cable.

[0046] Example 4

[0047] The difference between this embodiment and embodiment 1 is that the amount of diaminodiphenyl sulfone is 3.2 parts and the amount of 4-aminobenzyl diethyl phosphate is 0.8 parts.

[0048] Example 5

[0049] The difference between this embodiment and embodiment 1 is that the amount of diaminodiphenyl sulfone is 2 parts and the amount of 4-aminobenzyl diethyl phosphate is 2 parts.

[0050] Example 6

[0051] The difference between this embodiment and embodiment 1 is that the amount of diaminodiphenyl sulfone is 1 part and the amount of 4-aminobenzyl diethyl phosphate is 3 parts.

[0052] Example 7

[0053] The difference between this embodiment and embodiment 1 is that the amount of diaminodiphenyl sulfone is 0.8 parts and the amount of 4-aminobenzyl diethyl phosphate is 3.2 parts.

[0054] Example 8

[0055] The difference between this embodiment and embodiment 1 is that 4-aminobenzyl diethyl phosphate is replaced by an equal amount of diaminodiphenyl sulfone.

[0056] Example 9

[0057] The difference between this embodiment and embodiment 1 is that diaminodiphenyl sulfone is replaced by an equal amount of 4-aminobenzyl diethyl phosphate.

[0058] Comparative Example 1

[0059] The only difference between this comparative example and Example 1 is that diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate are not added.

[0060] Test example

[0061] The tensile strength and elongation at break of the protective layer of the overhead insulated cables in Examples 1 to 9 and Comparative Example 1 were measured according to the method in GB / T 2951.11-2008 "General test methods for insulation and sheath materials of electric and optical cables - Determination of thickness and dimensions - Mechanical properties test", and the oxygen index of the protective layer was measured according to the method in GB / T 2406.2-2009 "Determination of combustion behavior of plastics by oxygen index method", and the measurement results are shown in Table 1.

[0062] Table 1 Performance measurement results of the protective layer of the overhead insulated cable in Examples 1 to 9 and Comparative Examples

[0063]

[0064] Compared with Example 1, Example 8 only adds diaminodiphenyl sulfone, Example 9 only adds 4-aminobenzyl diethyl phosphate, and Comparative Example 1 does not add diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate. As a result, the oxygen index, tensile strength and elongation at break of the protective layer of the overhead insulated cable in Example 1 are higher than those in Examples 8 to 9 and Comparative Example 1, indicating that the addition of diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate in the present invention can improve the oxygen index, tensile strength and elongation at break of the protective layer of the overhead insulated cable, and when the reinforcing modifier is composed of diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate, the oxygen index, tensile strength and elongation at break of the protective layer of the overhead insulated cable can be further improved.

[0065] Compared with Example 1, Examples 4 to 7 change the addition amounts of diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate. As a result, the oxygen index, tensile strength and elongation at break of the protective layer of the overhead insulated cable in Examples 5 to 7 are higher than those in Example 1 and Example 4, indicating that when the mass ratio of diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate is 1:1 to 4, the oxygen index, tensile strength and elongation at break of the protective layer of the overhead insulated cable can be further improved. By comparing Examples 5 to 7, it is found that when the mass ratio of diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate is 1:3, the oxygen index, tensile strength and elongation at break of the protective layer of the overhead insulated cable are the highest.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An overhead insulated cable, characterized in that: From inside to outside, there are conductor, shielding layer, insulating layer and protective layer; the conductor is composed of inner core layer and outer core layer from inside to outside, the inner core layer is composed of seven wires with equal diameter, and the outer core layer is composed of twelve wires with equal diameter; the protective layer is composed of the following raw materials in parts by weight: 100 parts of PVC resin, 15-20 parts of plasticizer, 12-16 parts of inorganic flame retardant, 10-12 parts of inorganic filler, 1-2 parts of cross-linking agent, 4-6 parts of reinforcing modifier, and 0.5-1.5 parts of antioxidant; the reinforcing modifier is composed of diaminodiphenyl sulfone and 4-aminobenzyl diethyl phosphate; the mass ratio of diaminodiphenyl sulfone to 4-aminobenzyl diethyl phosphate is 1:1-4.

2. An overhead insulated cable according to claim 1, characterized in that: The material of the insulating layer is PVC resin.

3. An overhead insulated cable according to claim 1, characterized in that: The shielding layer is a metal shielding layer.

4. An overhead insulated cable according to claim 1, characterized in that: The wires are all aluminum alloy wires.

5. An overhead insulated cable according to claim 1, characterized in that: The plasticizer includes one or more of DOP plasticizer, DIDP plasticizer and DEHP plasticizer.

6. An overhead insulated cable according to claim 1, characterized in that: The crosslinking agent is triallyl isocyanurate.

7. An overhead insulated cable according to claim 1, characterized in that: The antioxidant includes one or more of antioxidant 1076 , antioxidant 168 and antioxidant 1010 .

8. An overhead insulated cable according to claim 1, characterized in that: The inorganic flame retardant includes one or both of magnesium hydroxide and aluminum hydroxide.

9. An overhead insulated cable according to claim 1, characterized in that: The inorganic filler includes one or more of white carbon black, talc and attapulgite.

10. A method for preparing an overhead insulated cable according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. After the shielding layer is covered on the outside of the conductor, a shielding layer is formed; S2, extruding the insulating layer material outside the shielding layer to obtain a semi-finished overhead insulated cable; S3. Extruding the protective layer raw material onto the semi-finished cable to obtain an overhead insulated cable.

Images