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Flexible high temperature resisting fireproof cable and preparation method thereof

A fireproof cable and high temperature resistant technology, which is applied in the direction of cable/conductor manufacturing, insulated cables, bendable cables, etc., can solve the problems of lower reliability, lower insulation resistance, complicated manufacturing process, etc., achieve excellent bending performance and improve bending Performance and material cost reduction effects

Active Publication Date: 2017-07-21
云南滇缆实业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of magnesium oxide as the mineral insulating material, there are many deficiencies in the actual production and application of rigid mineral insulated cables: restricted by the extremely complicated preparation process, the cross-sectional area of ​​multi-core rigid mineral insulated cables can only reach 35mm 2 , and rigid mineral insulated cables cannot be made into longer lengths, the maximum length is only a few hundred meters, and a large number of joints are formed between each manufacturing length, and the joints are easy to absorb moisture, reducing insulation resistance and greatly reducing the reliability of application
The fire-resistant cable in the form of wrapping is actually coated on the wrapping carrier with an oxygen-insulating crust material through an adhesive. After a fire occurs, the oxygen-insulating crust material is also easy to fall off, so its fireproof performance is not ideal.
[0005] Therefore, the fireproof cables in the prior art have high cost, complex manufacturing process, and inconvenient installation and laying. With the development of economy and society, how to improve the fireproof performance of cable products while reducing the full-cycle cost of fireproof cable products is of great significance

Method used

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  • Flexible high temperature resisting fireproof cable and preparation method thereof

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preparation example Construction

[0036] The preparation method of the flexible high temperature resistant fireproof cable of the present invention comprises the following steps:

[0037] 1. Prepare the core of the cable

[0038] The conductor material of the cable core adopts the aluminum alloy of the prior art, and the conductor is obtained through smelting, continuous casting and rolling, wire drawing and annealing according to the prior art, and the insulating layer is extruded and twisted into a cable to obtain the cable core.

[0039] 2. Preparation of nano-zirconia fiber composite reinforced zirconium silicate wet gel

[0040] At 20°C, mix ethyl orthosilicate, ethanol, and deionized water, stir evenly, then add hydrochloric acid, water, and ethanol to make the pH of the mixture 2, and finally add 2mol / L zirconium oxychloride solution and sodium fluoride to obtain zirconium silicate sol, and the molar ratio of Zr:Na:Si in the zirconium silicate sol is 1:0.3:1.2-1.5.

[0041] According to the weight rat...

Embodiment 1

[0055] 1. Prepare the core of the cable

[0056] The conductor material of the cable core is an aluminum alloy conductor, and the insulating layer is extruded outside the conductor to obtain an insulated core, and the insulated core is stranded to form a cable core.

[0057] 2. Preparation of nano-zirconia fiber composite reinforced zirconium silicate wet gel

[0058] At 20°C, mix ethyl orthosilicate, ethanol, and deionized water, stir evenly, then add hydrochloric acid, water, and ethanol to make the pH of the mixture 2, and finally add 2mol / L zirconium oxychloride solution and sodium fluoride to obtain zirconium silicate sol, and the molar ratio of Zr:Na:Si in the zirconium silicate sol is 1:0.3:1.2.

[0059] According to the weight ratio of zirconium silicate sol and nano-zirconia fiber 100:12, add nano-zirconia fiber with a length of 52nm and a diameter of 15nm to the zirconium silicate sol, and compound with zirconium silicate sol: at 45°C Electromagnetic stirring at a ...

Embodiment 2

[0072] 1. Prepare the core of the cable

[0073] The conductor material of the cable core is an aluminum alloy conductor, and the insulating layer is extruded outside the conductor to obtain an insulated core, and the insulated core is stranded to form a cable core.

[0074] 2. Preparation of nano-zirconia fiber composite reinforced zirconium silicate wet gel

[0075] At 20°C, mix ethyl orthosilicate, ethanol, and deionized water, stir evenly, then add hydrochloric acid, water, and ethanol to make the pH of the mixture 2, and finally add 2mol / L zirconium oxychloride solution and sodium fluoride to obtain zirconium silicate sol, and the molar ratio of Zr:Na:Si in the zirconium silicate sol is 1:0.3:1.3.

[0076] According to the weight ratio of zirconium silicate sol and nano-zirconia fiber 100:15, add nano-zirconia fiber with a length of 80nm and a diameter of 28nm to the zirconium silicate sol, and compound with zirconium silicate sol: at 45°C Electromagnetic stirring at a ...

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Abstract

The invention discloses a flexible high temperature resisting fireproof cable and a preparation method thereof. The objectives of the invention are to improve fireproof performance of a fireproof cable and reduce cost. A fireproof heat insulation composite gel layer wraps the exterior of a cable core. A metal sheath layer wraps the exterior of the composite gel layer. The method comprises steps of preparing a cable core of a cable and nano-zirconia fiber composite enhanced zirconium silicate wet gel; carrying out aging and drying processing; wrapping cable core with the fireproof thermal insulation composite gel layer; carrying out solidification processing; and wrapping the composite gel layer with a metal sheath layer. Compared with the prior art, the gel layer has a quite low heat conducting coefficient, and excellent thermal insulation performance; the cable is allowed to have quite excellent bending performance; by taking an annealed copper bellows as a first fireproof barrier, so when it is ensured that assemblies in the cable are not damaged by external mechanical factors, material cost is greatly reduced; and the cable is quite easy to produce, transport and install.

Description

technical field [0001] The invention relates to a cable and a preparation method thereof, in particular to a flexible cable and a preparation method thereof. Background technique [0002] Fireproof cables in the prior art are mainly mineral insulated cables (Mineral Insulated Cable), referred to as MI cables, which can be divided into rigid and flexible according to their structures. At the end of the 19th century, Swiss engineer Arnold Francois Borel proposed the idea of ​​rigid mineral insulated cables, which developed rapidly after being put into production in the 1930s and 1940s. In the 1960s, my country began to introduce and absorb and transform the technology of rigid mineral insulated cables, and gradually pushed the products into application. Due to the use of magnesium oxide as the mineral insulating material, there are many deficiencies in the actual production and application of rigid mineral insulated cables: restricted by the extremely complicated preparation ...

Claims

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Application Information

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IPC IPC(8): H01B7/04H01B7/20H01B7/29H01B13/00H01B13/22H01B13/24C04B38/08C04B28/00
CPCC04B28/005C04B2111/28C04B2111/40C04B2201/20C04B2201/32H01B7/04H01B7/20H01B7/29H01B7/292H01B13/00H01B13/22H01B13/24C04B14/4637C04B38/085C04B38/0054C04B38/0067C04B38/0074
Inventor 沈玉滨沈玉龙王柏松耿苏梅曲国辉
Owner 云南滇缆实业有限责任公司