Halogen-free flame retardant organosilane self-crosslinked polyolefin cable material and preparation method thereof

Abstract

The invention provides a halogen-free flame retardant organosilane self-crosslinked polyolefin cable material which comprises a material A, a material B and a material C, wherein the weight ratio of the material A to the material B to the material C is (80-85):(3-5):(10-17); the material A is prepared from polyolefin resin, a plasticizer, a halogen-free flame retardant, saturated fatty acid, a cross-linking agent, an initiator and an antioxidant; the material B is prepared from polyolefin resin, a high-performance catalyst, an antioxidant, a metal ion inhibitor, a metal oxide and a material B processing additive; the material C is prepared from polyolefin resin, a halogen-free flame retardant, a coupling agent and an antioxidant. The invention further discloses a preparation method of the halogen-free flame retardant organosilane self-crosslinked polyolefin cable material. The halogen-free flame retardant organosilane self-crosslinked polyolefin cable material is environment-friendly, has favorable flame retardance, heat resistance, ageing resistance and processability, is simple in preparation process and low in energy consumption, and has relatively good economic benefits.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant silane self-crosslinking polyolefin cable material and a preparation method thereof, which are mainly applied to flexible cable products such as transmission lines, and belong to the field of cable material production technology. Background technique [0002] The polyolefin cable material itself has excellent mechanical properties and processing properties, but the polyolefin material itself is a flammable material. When the electric energy is subject to internal failure or external fire source during the cable transportation, the cable can easily cause fire. Fire loss requires adding flame retardants to the material to achieve the flame retardant effect of wires and cables. [0003] After the wire and cable material is cross-linked, the high temperature resistance, crack resistance, mechanical properties and flame retardant properties of the material can be improved. At present, there are three ...

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Problems solved by technology

[0005] Most of the existing silane-crosslinked low-smoke and halogen-free products are boiled or steam crosslinked. This process is time-consuming and energy-consuming. Boiling will also affect the electrical properties and flame retardancy of the material.

Chinese patent CN102093625B discloses a low-smoke and halogen-free one-step silane naturally crosslinked polyolefin cable compound and its preparation method. The disadvantage of this method is that the grafting reaction of silane occurs in the single-screw extruder used by cable manufacturers to extrude cables. For customers Extrusion equipment and extrusion process requirements are very high. If the grafting reaction is not well controlled, it is particularly prone to non-crosslinking or pre-crosslinking

Chinese patent CN101245169B discloses a water-free low-smoke, halogen-free, flame-retardant silane cross-linked polyolefin composition and a preparation method thereof. The initiator and silane were added to the material A during the mixing process of the internal mixer. In this process, the preparation of the flame retardant composite material was carried out simultaneously with the silane grafting reaction of the resin. In the last step of the preparation of the base material A, the initiator and silane were also added. After the compound solution is absorbed, there will still be side reactions in the cable extrusion process, and the product quality is not easy to control

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