CN103897258B - High-intensity high combustion property cable - Google Patents

Abstract

The invention discloses a high-strength and high-flame-retardant cable, which belongs to the field of electric power facilities. The raw materials of the sheath tube of the cable include, by weight, 80-90 parts of polyolefin, 2-5 parts of plant ash, and 1-5 parts of gum. 3 parts, 0.5-0.8 parts of silane coupling agent, 1-2 parts of stearic acid, 0.6-0.8 parts of white carbon black, 3-5 parts of electrolytic zinc acid leaching residue, the tensile strength of the obtained cable sheath tube is above 26MPa , the elongation at break is above 750%, the oxygen index is above 36, and the flame retardancy reaches Class A, which has the characteristics of high strength and strong flame retardancy; at the same time, plant ash and electrolytic zinc acid leaching slag are recycled, reducing It reduces environmental pollution and reduces production costs, and has significant economic and environmental benefits.

Description

High Strength High Flame Retardancy Cable

technical field

The invention relates to the field of electric facilities, in particular to a cable with high strength and high flame retardancy.

Background technique

With the gradual acceleration of the urbanization process, urban planning is becoming more and more modern. In the process of urban construction, cable entry into the ground has become the minimum construction requirement. At the same time, in the process of urban transformation, it is also necessary to put various cables erected in the air into the ground. At present, the construction of cables into the ground often adopts non-excavation technology. This construction method has the advantages of no impact on traffic, little damage to the stratum structure, and short cycle. , has the performance: the cable needs to have high strength, good rigidity and toughness, etc. In addition, due to the characteristics of the cable itself, it also needs to have the characteristics of high flame retardancy, so as to prevent fire caused by short circuit and other safety accidents. For cables in the field, the above requirements are also met. To meet the above requirements, the cable also has the same requirements for its sheath tube, because the sheath tube is located at the outermost layer of the cable. At present, most of the common cable sheathing tubes are mainly made of polymer materials such as polyethylene, polypropylene, polyvinyl chloride, etc., and certain additives are added to improve their related properties. However, these current cable sheathing tubes are still unsatisfactory in terms of strength, rigidity and flame retardancy, or there is only a certain improvement in a certain aspect of performance, and there is a lot of room for further improvement.

Contents of the invention

One of the objectives of the present invention is to provide a cable with strength, rigidity, toughness and flame retardancy to solve the above problems.

The technical scheme adopted in the present invention is as follows: a high-strength and high-flame-retardance cable, which includes a core, an insulating layer, an inner sheath and a sheath tube from the inside to the outside, and the raw material of the sheath tube, by weight Servings, including:

Among the above-mentioned raw materials, polyolefin is used as a matrix, and it is cross-linked with plant ash, stearic acid, electrolytic zinc acid leaching residue and silane crosslinking agent, so that the polyolefin can be modified, and the conjunctiva is sealed with gum, thereby A sheath tube with high strength and high flame retardancy is obtained.

"Electrolytic zinc acid leaching slag" described in the present invention refers to the electrolytic zinc acid leaching slag that adopts the production process of roasting-leaching-electrolysis to carry out the electrolytic zinc acid leaching slag discharged by the wet method zinc smelting. This electrolytic zinc acid leaching slag contains a large amount of Inorganic ions, the typical mass percentages are: zinc silicate 8-10%, copper 1-2%, lead 0.5-1.8%, silicon 2-3%, iron 1-2%, calcium 10-12%, Magnesium 2-3%. There is currently no suitable treatment method for this electrolytic zinc acid leaching residue, which is likely to pollute the environment. The present invention obtains through a large number of experiments that the strength of the sheath pipe can be enhanced by adopting an appropriate proportion of electrolytic zinc acid leaching slag and adding other components.

As a preferred technical solution: the polyolefin is an ethylene-octene copolymer.

As a preferred technical solution: the plant ash is the plant ash obtained after burning straw in a power plant. On the one hand, the plant ash from the power plant can be recycled, on the other hand, because of the substances contained in the plant ash, it can better help the strength and flame retardancy of the cable sheath, and also reduce the cost of raw materials.

As a preferred technical solution: the gum is Arabic gum. Gum Arabic has a wide range of sources and is cheap, and it can synergistically produce better flame retardant effects in the raw material combination of sheathing tubes.

As a preferred technical solution: the raw materials of the sheath tube, in parts by weight, include:

The inventor has proved through a large number of experiments that the strength and flame retardancy of the sheathed pipe prepared with this ratio of raw materials are better.

The second object of the present invention is to provide a method for preparing the above-mentioned high-strength and high-flame-retardance cable, the technical solution adopted is: comprising the following steps:

(1) Melt blending: mix polyolefin, plant ash, silane coupling agent, stearic acid, and electrolytic zinc acid leaching residue according to the above ratio, stir at a speed of 600r/min for 10min, and then melt blend at 170°C for 10min , get rubber;

(2) Cross-linking: After cross-linking the rubber material obtained in step (1) at 170°C for 30 minutes, then add gum and white carbon black according to the stated ratio, and react for 10 minutes to obtain a mixture;

(3) Granulation: the mixture obtained in step (2) is added to a twin-screw extruder for blending and extrusion, and then granulated to obtain pellets;

(4) Preparing a sheath tube: adding the granular material obtained in step (3) to a basic molding machine for forming, sizing, pulling, and cutting to obtain a sheath tube;

(5) Preparation of cable: use the sheath tube obtained in step (4) for the outermost layer of the cable to obtain a cable.

Due to the adoption of the above preparation method, the raw materials of the cable sheathing tube react and cooperate with each other, so that the obtained sheathing tube has high strength and high flame retardancy.

In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: the tensile strength of the obtained cable sheath tube is above 26MPa, the elongation at break is above 750%, the oxygen index is above 36, and the flame retardant performance Reaching Class A, it has the characteristics of remarkable strength, high flame retardancy and strong performance; at the same time, it recycles plant ash and electrolytic zinc acid leaching residue, which reduces environmental pollution and reduces production costs, and has significant economic and environmental benefits. .

detailed description

The present invention will be described in detail below.

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1:

A high-strength and high-flame-resistance cable, which sequentially includes a wire core, an insulating layer, an inner sheath, and a sheath tube from the inside to the outside, and the raw materials of the sheath tube, by weight, include:

Preparation method: comprising the following steps:

(1) Melt blending: mix polyolefin, plant ash, silane coupling agent, stearic acid, and electrolytic zinc acid leaching residue according to the above ratio, stir at a speed of 600r/min for 10min, and then melt blend at 170°C for 10min , get rubber;

(2) Cross-linking: After cross-linking the rubber material obtained in step (1) at 170°C for 30 minutes, then add gum and white carbon black according to the stated ratio, and react for 10 minutes to obtain a mixture;

(3) Granulation: the mixture obtained in step (2) is added to a twin-screw extruder for blending and extrusion, and then granulated to obtain pellets;

(4) Preparing the sheath pipe: adding the granular material obtained in step (3) to the basic molding machine for forming, sizing, pulling, and cutting to obtain the sheath pipe A;

(5) Preparation of cable: use the sheath tube obtained in step (4) for the outermost layer of the cable to obtain a cable.

Example 2

A high-strength and high-flame-resistance cable, which sequentially includes a wire core, an insulating layer, an inner sheath, and a sheath tube from the inside to the outside, and the raw materials of the sheath tube, by weight, include:

Preparation method: comprising the following steps:

(1) Melt blending: mix polyolefin, plant ash, silane coupling agent, stearic acid, and electrolytic zinc acid leaching residue according to the above ratio, stir at a speed of 600r/min for 10min, and then melt blend at 170°C for 10min , get rubber;

(2) Cross-linking: After cross-linking the rubber material obtained in step (1) at 170°C for 30 minutes, then add gum and white carbon black according to the stated ratio, and react for 10 minutes to obtain a mixture;

(3) Granulation: the mixture obtained in step (2) is added to a twin-screw extruder for blending and extrusion, and then granulated to obtain pellets;

(4) Preparing the sheath tube: adding the granular material obtained in step (3) to the basic molding machine for forming, sizing, pulling, and cutting to obtain the sheath tube B;

(5) Preparation of cable: use the sheath tube obtained in step (4) for the outermost layer of the cable to obtain a cable.

Example 3

A high-strength and high-flame-resistance cable, which sequentially includes a wire core, an insulating layer, an inner sheath, and a sheath tube from the inside to the outside, and the raw materials of the sheath tube, by weight, include:

Preparation method: comprising the following steps:

(1) Melt blending: mix polyolefin, plant ash, silane coupling agent, stearic acid, and electrolytic zinc acid leaching residue according to the above ratio, stir at a speed of 600r/min for 10min, and then melt blend at 170°C for 10min , get rubber;

(2) Cross-linking: After cross-linking the rubber material obtained in step (1) at 170°C for 30 minutes, then add gum and white carbon black according to the stated ratio, and react for 10 minutes to obtain a mixture;

(3) Granulation: the mixture obtained in step (2) is added to a twin-screw extruder for blending and extrusion, and then granulated to obtain pellets;

(4) Preparing the sheath tube: adding the granular material obtained in step (3) to the basic molding machine for forming, sizing, pulling, and cutting to obtain the sheath tube C;

(5) Preparation of cable: use the sheath tube obtained in step (4) for the outermost layer of the cable to obtain a cable.

Embodiment 4 strength performance and flame retardant performance test

Test standard: According to the standard test of GB/T1040.1-2006, the tensile strength and elongation at break of the sheath pipe A, sheath pipe B and sheath pipe C obtained in Example 1-3 of the present invention are tested according to GB/T1040.1-2006. The oxygen index of the sheath pipe A, sheath pipe B, sheath pipe C that the standard test of T2406-1993 embodiment of the present invention 1-3 gains; The flame retardant grades of casing pipe A, jacket pipe B, and jacket pipe C are compared with ordinary polyethylene jacket pipes available on the market. The results are shown in Table 1.

Table 1 strength performance and flame retardant performance test results

Sheath tube A Sheath tube B Sheath tube C comparative example Tensile strength (MPa) 28 26 36 twenty one Elongation at break (%) 750 770 860 580 Oxygen Index 36 37 39 29 Flammability rating B B A C

It can be seen from Table 1 that the products of the above embodiments have the characteristics of high strength and strong flame retardancy.

Claims (2)

1. A high-strength and high-flame-resistance cable, comprising a wire core, an insulating layer, an inner sheath and a sheath tube from the inside to the outside, is characterized in that the raw material of the sheath tube, in parts by weight, includes : Polyolefin 80-90 parts Plant ash 2-5 parts 1-3 parts of gum Silane coupling agent 0.5-0.8 parts 1-2 parts of stearic acid White carbon black 0.6-0.8 parts 3-5 parts of electrolytic zinc acid leaching residue; in, The composition and content of the electrolytic zinc acid leaching residue are: zinc silicate 8-10%, copper 1-2%, lead 0.5-1.8%, silicon 2-3%, iron 1-2%, calcium 10-12% %, Magnesium 2-3%; The polyolefin is an ethylene-octene copolymer; Described gum is gum arabic. 2. The high-strength and high-flame-retardance cable according to claim 1, characterized in that, the plant ash is the plant ash obtained after burning straw in a power plant.