CN-122025261-A - Environment-friendly fire-resistant power cable and preparation method thereof

Abstract

The invention relates to the field of cables, and provides an environment-friendly fire-resistant power cable aiming at the problems of high cost and insufficient fire resistance of fire-resistant cables in the prior art, which comprises a stranded copper conductor, a fire-resistant layer and an insulating layer, wherein the fire-resistant layer and the insulating layer are sequentially coated outside the stranded copper conductor, the fire-resistant layer is a mica tape, and the insulating layer comprises, by weight, 15-25 parts of ethylene-vinyl acetate copolymer, 10-15 parts of polyethylene, 10-15 parts of maleic anhydride, 15-25 parts of ceramic powder, 3-7 parts of kaolin, 20-30 parts of aluminum hydroxide, 15-25 parts of magnesium hydroxide, 1-3 parts of an antioxidant and 0.5-3 parts of a cross-linking agent. The invention optimizes the cable material and structure to ensure that the cable has excellent fire resistance and flame retardance.

Inventors

• TAO XING
• GAO YUBO
• YE XINGTAO
• SU XIAOBO
• SU DONGBO
• LU ZHENGRONG
• XU LINGYUN
• XU ZHIQIANG
• YUAN ZEWEN
• WANG TIANSHI
• ZHANG MENG
• CHEN ZHEN
• HUANG JINFANG

Assignees

• 浙江万马股份有限公司
• 浙江万马电缆有限公司
• 山东万海电缆有限公司

Dates

Publication Date

20260512

Application Date

20241112

Claims (10)

1. 1. The environment-friendly fire-resistant power cable is characterized by comprising a plurality of strands of stranded copper conductors, a fire-resistant layer and an insulating layer, wherein the fire-resistant layer and the insulating layer are sequentially coated outside the stranded copper conductors, the fire-resistant layer is a mica tape, and the insulating layer comprises, by weight, 15-25 parts of ethylene-vinyl acetate copolymer, 10-15 parts of polyethylene, 10-15 parts of maleic anhydride, 15-25 parts of ceramic powder, 3-7 parts of kaolin, 20-30 parts of aluminum hydroxide, 15-25 parts of magnesium hydroxide, 1-3 parts of an antioxidant and 0.5-3 parts of a cross-linking agent.
2. 2. The environment-friendly fire-resistant power cable according to claim 1, wherein the preparation method of the mica tape comprises the following steps: (S1) acidizing the calcined mica paper to obtain calcined mica paper with carboxyl; (S2) spraying an aqueous adhesive solution containing glass fibers on the surface of the calcined mica paper with carboxyl groups; (S3) hot-press molding, cooling, rolling and cutting to obtain the mica tape with mica on one side and glass fiber on the other side.
3. 3. The environment-friendly fire-resistant power cable according to claim 2, wherein the glass fiber is modified glass fiber, and the preparation method of the modified glass fiber comprises the following steps of placing the glass fiber in hydrogen peroxide solution.
4. 4. An environmentally friendly fire resistant power cable according to claim 2 wherein said aqueous adhesive is a polyurethane aqueous adhesive.
5. 5. The environment-friendly fire-resistant power cable according to claim 2, wherein the preparation method of the polyurethane water-based adhesive comprises the following steps of slowly stirring polyurethane acrylic ester and deionized water to avoid bubble formation, adding a thickener and a lubricant, and defoaming to obtain the polyurethane water-based adhesive.
6. 6. The environment-friendly fire-resistant power cable according to claim 1 is characterized in that the thickness of the fire-resistant layer is 0.12-0.16 mm, the fire-resistant layer comprises two layers of mica tapes, the fire-resistant layer consists of a first mica tape and a second mica tape which are wrapped, the first mica tape and the second mica tape are sequentially wrapped outside a stranded copper conductor, and the overlapping rate is 25-30%.
7. 7. An environmentally friendly fire resistant power cable according to claim 2 or 6 wherein the mica side of the mica tape is adjacent to the stranded copper conductor and the glass fiber side of the mica tape is adjacent to the insulating layer.
8. 8. The environment-friendly fire-resistant power cable according to claim 1, wherein the thickness of the insulating layer is 2.4-2.6 mm.
9. 9. An environmentally friendly fire resistant power cable according to claim 1 wherein the conductors are of the type tin-plated copper, and further preferably are of the type seven stranded.
10. 10. The method for preparing the environment-friendly fire-resistant power cable according to any one of claims 1 to 9, which is characterized by comprising the following steps: (1) Preparing stranded copper conductors; (2) Forming a fire-resistant layer outside the conductor by wrapping the mica tape; (3) And extruding and wrapping an insulating layer with the thickness of 2.4-2.6 mm outside the mica tape, and performing irradiation crosslinking to obtain the environment-friendly fire-resistant power cable.

Description

Environment-friendly fire-resistant power cable and preparation method thereof Technical Field The invention relates to the field of cables, in particular to an environment-friendly fire-resistant power cable and a preparation method thereof. Background Unlike fire-retardant cable, fire-retardant cable focuses on preventing the rapid spread of fire, and fire-retardant wire and cable can ensure that the line is normally electrified in a certain time, transmits various control signals and alarm signals when a fire disaster occurs, thereby providing valuable time for people evacuation and rescue. The BS6387 fire-resistant standard is gradually adopted, fire-resistant wires and cables are required to have high temperature resistance, power transmission is still stably maintained at high temperature, and the amount of smoke generated during combustion is relatively small. The Chinese patent with the application number of CN201510852720.5 discloses a halogen-free flame-retardant ceramic polyolefin cable material for a fire-resistant cable and a preparation method thereof, and the halogen-free flame-retardant ceramic polyolefin cable material is converted into a hard ceramic protective layer after being ignited at high temperature, has certain mechanical strength, and ensures the normal operation of a wire and cable line. However, the microcapsule has high cost and is difficult to popularize, and the microcapsule is easy to damage after being ignited at high temperature to influence the release of red phosphorus, so that the flame retardant effect is poor. Disclosure of Invention The invention provides an environment-friendly fire-resistant power cable, which aims to solve the problems of high cost and insufficient fire resistance of the fire-resistant cable in the prior art, has excellent fire resistance through optimization of materials and structures, and reduces the cost. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides an environment-friendly fire-resistant power cable which comprises a plurality of stranded copper conductors, a fire-resistant layer and an insulating layer, wherein the fire-resistant layer and the insulating layer are sequentially coated outside the stranded copper conductors, the fire-resistant layer is a mica tape, and raw materials of the insulating layer comprise, by weight, 15-25 parts of ethylene-vinyl acetate copolymer, 10-15 parts of polyethylene, 10-15 parts of maleic anhydride, 15-25 parts of ceramic powder, 3-7 parts of kaolin, 20-30 parts of aluminum hydroxide, 15-25 parts of magnesium hydroxide, 1-3 parts of an antioxidant and 0.5-3 parts of a cross-linking agent. Mica has high heat resistance temperature and low thermal conductivity, and environment-friendly fire-resistant power cable is through selecting the mica tape as the flame retardant coating for the mica tape can delay heat conduction under the conflagration condition, effectively protects the conductor of cable, keeps its structure and electrical property, keeps long-time safe operating condition. And the mica is a natural mineral, has regenerability, does not contain toxic chemical components, and meets the standard of environmental protection. Under the condition of fire or high temperature, the mica can not release harmful gases, thereby reducing the harm to the environment and the human body. Mica has good insulativity, can effectively prevent the cable from short circuit and leakage at high temperature, and improves the safety of the cable. The mica tape is relatively light, is convenient to operate in the cable production and installation process, and does not increase excessive burden. The insulating layer prepared from the raw materials is halogen-free polyolefin, halogen-free acid gas is emitted during combustion, the release amount of toxic and corrosive gas is very small, the smoke concentration of the product is very low, and the flame retardant effect is very good. The insulating layer of the environment-friendly fireproof power cable has different functions, and the insulating layer is added with ceramic powder as a raw material, so that the insulating layer can be converted into a hard ceramic protective layer through porcelain after being ignited at high temperature, has a good heat insulation function, has certain mechanical strength, and ensures the normal operation of a wire and cable line. The various raw materials of the insulating layer play different roles, and specifically, maleic anhydride is used as a copolymerization modifier, so that the compatibility of polyethylene and ethylene-vinyl acetate copolymer is enhanced, and the interfacial bonding performance between two relatively incompatible polymers is improved, so that the material of the insulating layer provides good electrical insulating performance, is suitable for extreme environments, and improves the toughness, heat resistance and weather resistance of the cable