High-flexibility and flame-retardant halogen-free cable material and preparation method thereof

Abstract

The invention discloses a high-flexible and flame-retardant halogen-free cable material, which is prepared from the following raw materials in parts by weight: 100 parts of EPDM rubber, 1-3 parts of an anti-aging agent, 45-55 parts of a halogen-free flame retardant, 0.5-1 part of an antioxidant, 3-8 parts of nanocomposite, 5-8 parts of paraffin oil, 1-2 parts of a crosslinking agent and 0.5-1 part of a coupling agent, and also provides a preparation method of the above high-flexibility and flame-retardant halogen-free cable material: mixing the EPDM rubber, the anti-aging agent and (1-3) / 4 formulated amount of the nanocomposite, adding the halogen-free flame retardant, antioxidant, paraffin oil and coupling agent and performing mixing, thinning, filtering and calendaring for sheeting without slitting, and adding the crosslinking agent and (1-3) / 4 formulated amount of the nanocomposite and mixing to obtain the high-flexibility and flame-retardant halogen-free cable. The cable material prepared by the invention has good softness and the material oxygen index reaches OI is more than or equal to 38, offering good flame retardant performance.

Description

technical field [0001] The invention relates to a cable insulating material and a preparation method thereof, in particular to a highly flexible flame-retardant halogen-free cable material and a preparation method thereof. Background technique [0002] With the rapid construction of my country's 4G communication network and cloud data base, the demand for power in the computer room has doubled, so the amount of communication power cables used for power transmission has increased significantly. At present, the most widely used communication power cables in the communication room are flame-retardant flexible cables, and polyvinyl chloride and polyolefin are mostly used as insulating materials. Due to the high hardness of this insulating material, the bending performance of the prepared cables is not good, which cannot meet In the laying and installation of relatively narrow wiring space, at the same time, the internal mechanical stress of the insulating layer due to excessive ...

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Problems solved by technology

The cable insulation material prepared by this invention reduces the Shore hardness to 51-58, has low elastic modulus and high resistivity, but its flame retardancy is poor

[0006] As the laying environment requirements are getting higher and higher, wires and cables are developing towards low-smoke, halogen-free flame retardant. However, since EPDM is a flammable material, its molecular composition and structure have little influence on the flame retardant performance. Flame retardants can achieve the purpose of flame retardancy, so in order to make low-smoke halogen-free flame-retardant materials, only halogen-free flame retardants can be added

However, the electrical properties of EPDM are greatly affected by flame retardants, and it is necessary to meet the insulation resistance of EPR insulating rubber in the standard of IEC 60502 "Rated Voltage 1-30kV Extruded Insulated Cables and Their Accessories" at the highest temperature of the conductor ≥ 3.67MΩ ·km and volume resistivity ≥1×10 12 Ω·cm, and at the same time pass the vertical burning test of a single EPDM insulated core, which is relatively difficult. Therefore, it is urgent to provide a highly flexible halogen-free flame-retardant cable material suitable for communication power supplies.

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