Low-smoke zero-halogen flame-retardant polyolefin oxygen barrier material

Abstract

The invention relates to a low-smoke zero-halogen flame-retardant polyolefin oxygen barrier material with low heat release and high coking property, which comprises Levapren rubber and a ceramic master batch. The VA content of the Levapren rubber is greater than or equal to 50%, and at 100 DEG C, the mooney viscosity of the Levapren rubber is 20-30; based on the total weight of the ceramic masterbatch, the ceramic master batch comprises the following components in percentage by mass: 40-60% of ceramic powder, 40-60% of polyethylene resin, 0.1-0.3% of first antioxidant, 0.1-0.5% of polyethylene wax and 0.2-0.6% of silicone powder. The polyolefin oxygen barrier material disclosed in the invention has low heat release property, high coking property and excellent extrusion machinability.

Description

technical field [0001] The invention relates to an oxygen barrier material, in particular to a low-smoke, halogen-free flame-retardant polyolefin oxygen barrier material. Background technique [0002] With the rapid development of my country's economy and the improvement of people's living standards, people have paid unprecedented attention to safety and environmental protection. Cable safety has received more and more attention, and the demand for fireproof cables is increasing. The fireproof cable mainly includes a wire, an insulation layer wrapping the wire, an outer sheath, and an oxygen barrier between the insulation layer and the outer sheath. The oxygen barrier layer is made of oxygen barrier materials. Low-smoke, halogen-free and flame-retardant polyolefin oxygen barrier materials are sought after by the market for their advantages such as low smoke, no halogen, low toxicity after burning, and flame retardancy. [0003] Conventional low-smoke halogen-free flame-reta...

AI Technical Summary

Problems solved by technology

Its disadvantages are as follows: simply add a large amount of inorganic hydroxide to improve its flame retardant performance, usually with a density of 1.65±0.02g / cm 3 , due to the poor compatibility between inorganic hydroxide and organic resin, the physical properties of the resin are greatly reduced, the strength is ≤6MPa, and the elongation at break is ≤100%. In addition, a large amount of inorganic hydroxide is added, resulting in high viscosity when the material is melted and extruded Large torque, high extrusion current and slow speed limit the production efficiency of cables

What's more serious is that even if the oxygen barrier layer is filled with a large amount and the oxygen index is high, the carbonization property after combustion is poor and the expansion is serious, which cannot effectively isolate and protect the internal insulating layer.

In addition, when burning, the heat release rate is high, the total heat release is large, the combustion growth index is high, and the smoke production rate is large. The cable made still cannot meet the combustion level requirements of B1 in the GB31247-2014 standard.

CN 106750855 A discloses a fire-resistant expansion low-smoke halogen-free flame-retardant sheath material, which is used to prepare an outer sheath, but the outer sheath and the oxygen barrier layer have different performance requirements, and the sheath material cannot be directly used for the preparation Oxygen barrier layer, therefore, it is necessary to develop a low-smoke halogen-free flame-retardant polyolefin oxygen barrier material

Images