Low-smoke halogen-free flame-retardant polyolefin sheath material for data cable and preparation method thereof

Abstract

The invention discloses a low-smoke halogen-free flame-retardant polyolefin sheath material for a data cable. The low-smoke halogen-free flame-retardant polyolefin sheath material comprises the following raw material components in parts by weight: 40-80 parts of an ethylene-vinyl acetate copolymer; 3-10 parts of an ethylene-methyl methacrylate copolymer; 5-20 parts of an ethylene-octylene copolymer; 5-20 parts of modified polyethylene; 150-220 parts of an inorganic flame retardant; 3-10 parts of wollastonite; 3-10 parts of nano aluminum nitride; 10-20 parts of flame-retardant charring master batch; 1-3 parts of a silane coupling agent; 1-5 parts of a lubricant; 2-5 parts of color master batch; and 1-3 parts of an antioxidant. According to the present invention, the product has excellent heat resistance, during the high current resistance test, the fuming time from the energization to the beginning is long, the fuming amount is small, the foaming time is long, and more importantly, the foaming is small and less, even no foaming is generated, and the yellowing time and the cracking time are long. The material can well meet the requirement that a CAT6 / 6A type data cable of a UTP structure passes through bunching C type combustion, and other performance indexes also reach or exceed corresponding industrial standards.

Description

technical field [0001] The invention relates to the technical field of cable materials, in particular to a low-smoke, halogen-free, flame-retardant polyolefin sheath material for data cables that has passed the C-type bundled combustion test and a preparation method thereof. Background technique [0002] With the rapid development of the information industry, the Internet and information transmission technologies are becoming more and more mature, and the number of fixed broadband access users is increasing, the market demand for data cables continues to rise and the market scale continues to expand. With the improvement of people's awareness of public safety, information security and other safety and environmental protection, higher requirements are put forward for the flame retardant requirements of data cables. Now the domestic and foreign markets require data cables to meet IEC 60332-3-24 (domestic corresponding GB / T 18380.35-2008) and EU CPR regulations. [0003] The f...

AI Technical Summary

Problems solved by technology

[0004] Conventional low-smoke, halogen-free, flame-retardant polyolefin sheath materials currently used in market data cables can only meet the requirements of oxygen index ≥ 32%, and the basic requirements of finished cables meet IEC 60332-1-2 (GB / 18380.12-2008) single vertical Combustion requirements, but with the improvement of safety concepts and requirements, data cables need to meet the requirements of IEC 60332-3-24 (GB / T 18380.35-2008) bundled C-type combustion requirements, resulting in the existing low-smoke halogen-free flame-retardant polymer Olefin sheath material cannot be bundled with Class C combustion requirements