A low-friction, low-smoke, halogen-free, flame-retardant sheath material suitable for air-blown optical cable laying and preparation method thereof

Abstract

The invention discloses a low-friction, low-smoke, halogen-free flame-retardant sheathing material suitable for air-blown optical cable laying and a preparation method thereof. The sheathing material is composed of the following parts by weight of raw materials: 100 parts of matrix resin, composite filler type flame-retardant 100-150 parts of compound lubricant, 5-15 parts of nano-scale hydrotalcite, 1-2 parts of silane coupling agent, 1-4 parts of compound lubricant, 0.2-0.8 part of compound antioxidant, after mixing, extrusion, In the steps of granulation, cooling, screening and packaging, in the present invention, the friction coefficient of the sheath material obtained through careful formulation selection and processing is as low as 0.1 or less, the extrusion speed is fast, and the rejection rate is low, which is especially suitable for pipelines. In the construction of laying multiple optical cables by air blowing, because of the combination of hydrotalcite and various lubricants, it breaks through the common low-smoke halogen-free flame retardant sheath material due to a large amount of aluminum hydroxide and magnesium hydroxide. 0.25 or more will affect the air-blown laying of the optical cable.

Description

technical field [0001] The invention belongs to the technical field of preparation of a low-smoke halogen-free flame-retardant sheathing material, and in particular relates to a low-friction, low-smoke, halogen-free flame-retardant sheathing material suitable for air-blown optical cable laying and a preparation method thereof. Background technique [0002] Common low-smoke halogen-free flame retardant polyolefin cable materials are mostly based on LLDPE (linear low density polyethylene) and EVA (ethylene-vinyl acetate copolymer) as the main resin substrates, supplemented by a small amount of interfacial compatibilizer and filled. A large amount of inorganic flame retardants (chemically synthesized ultrafine aluminum hydroxide, or magnesium hydroxide). Although the cable material is supplemented with silicone or PE wax or EVA wax or amide wax, this type of cable material is mostly sharp, thorn-like or irregularly shaped hard crystals because of the inorganic flame retardant i...

AI Technical Summary

Problems solved by technology

Although the cable material is supplemented with silicone or PE wax or EVA wax or amide wax, this type of cable material is mostly a sharp thorn or irregular hard crystal in the microscopic state because of the inorganic flame retardant Adding too much lubricant will cause slippage in the screw extruder, making it difficult to process the cable sheath material in the cable factory. If the lubricant is added less, the friction coefficient will not drop, so the friction coefficient is generally not lower than 0.25

Therefore, when the optical cable is laid by air blowing, it is impossible to lay a sufficient number of optical cables in the limited pipe diameter due to the excessive frictional resistance between them.

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