Oil-resisting type silane cross-linked polyolefin cable material

Abstract

The invention discloses an oil-resisting type silane cross-linked polyolefin cable material. A halogen-free and low-smoke polyolefin insulating material is prepared from the following components in parts by weight: an ethylene-vinyl acetate copolymer EVA with the VA content of 40 percent, metallocene catalyzed polyethylene LLDPE, polyethylene EPPE, an ethylene-octene copolymer POE, maleic anhydride grafted metallocene polyethylene, powdered magnesium hydroxide, lamellar aluminum hydroxide, poly-silazane resin, silicon dioxide aerogel, magnesium stearate, silicone oil, an antioxidant, cage-likephosphate melamine salt, polyphenylene oxide, a coupling agent, a lubricant and 0.3 to 0.5 part of a rheological body; the rheological body is prepared from poly-p-phenylene terephthamide and white oil. According to the oil-resisting type silane cross-linked polyolefin cable material disclosed by the invention, the adding amounts of the magnesium hydroxide and the aluminum hydroxide are reduced,and the flame-retarding efficiency of the hydroxides can be extremely improved; influences, caused by the fact that a flame retardant is added, on mechanical properties are reduced; the oil-resistingtype silane cross-linked polyolefin cable material has good tensile strength of 15MPa and good elongation at break.

Description

technical field [0001] The invention relates to a polyolefin insulating material, in particular to an oil-resistant silane crosslinked polyolefin cable material. Background technique [0002] According to relevant literature statistics, most people are not burned to death in a fire, but are suffocated by a large amount of smoke and toxic gas, thus losing the chance to escape and eventually losing their lives. Because it produces less smoke and no toxic gas when it burns, halogen-free low-smoke flame-retardant polyolefin cable materials are gradually replacing traditional PVC cable materials. At present, more and more high-rise buildings, large shopping malls, hospitals, stations, stadiums and other public places have used a large number of halogen-free low-smoke flame-retardant cables. The most commonly used flame retardants for halogen-free low-smoke flame-retardant polyolefin cable materials are magnesium hydroxide, aluminum hydroxide and other mineral powders containing ...

AI Technical Summary

Problems solved by technology

If it is a cable, especially a wire, the flame retardant performance must be burned by a single piece, and the flame retardant filling amount in the halogen-free low-smoke flame-retardant polyolefin cable material used must reach 180%~200%. At this time, at this time The performance of the cable material will be greatly reduced; on the other hand, in the existing formula system, there is a casting phenomenon at the outlet die of the double-floor rod during the granulation process, and yellowing and zooming will occur after a period of time. If it is mixed into the finished product , there will be quality risks; when the output is 1200kg / h and the speed is 360r / min, the current of the main engine is 515A, which consumes a lot of energy; the melt index is 0.4~0.55g / 10min, and the material is easy to break when the client is applied. Poor extensibility

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