Natural silane cross-linking LSOH (Low Smoke Zero Halogen) flame-retardant polyolefin cable material and preparation method thereof

Abstract

The invention discloses a natural silane cross-linking LSOH (Low Smoke Zero Halogen) flame-retardant polyolefin cable material and a preparation method thereof. The natural silane cross-linking LSOH flame-retardant polyolefin cable material comprises a siliane grafted flame-retardant blend A and a catalyst flame-retardant master batch B; the blend A comprises the following ingredients in parts by weight: 100 parts of silane grafted resin, 100-150 parts of compound flame retardant, 1-20 parts of modified nano-montmorillonite, 0.5-5 parts of lubricant, and 0.5-2.0 parts of antioxidant, the master batch B comprises the following ingredients in parts by weight: 100 parts of polyolefin resin, 100-150 parts of compound flame retardant, 1-5 parts of catalyst and 0.5-3 parts of copper inhibitor. According to the natural silane cross-linking LSOH flame-retardant polyolefin cable material and the preparation method thereof, the siliane grafting reaction is completed separately, the natural effective crosslinking of the resin matrixes can be ensured, and side reaction produced in the follow-up process can be avoided. Through optimizing the compound flame retardants and adding the modified nano-montmorillonite, the product has the characteristics of being easy to process and LSOH high flame-retardant under relatively lower compactedness.

Description

technical field [0001] The invention relates to a silane crosslinked low-smoke halogen-free flame-retardant polyolefin cable material and a preparation method thereof. Background technique [0002] Polyolefin materials are flammable materials. When there are external fire sources or internal faults in the operation of wires and cables, wires and cables are easy to burn. In order to reduce fire losses, it is necessary to add flame retardants to the materials to achieve flame retardancy of wires and cables. . [0003] The current low-smoke and halogen-free fuels generally use high-filling inorganic flame retardants to achieve the purpose of flame retardancy. After adding a large amount of inorganic flame Wire and cable have the problems of poor mechanical properties, high hardness, and easy cracking. [0004] Wire and cable materials can improve high temperature resistance, crack resistance, mechanical properties and flame retardancy after cross-linking. The cross-linked lo...

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Problems solved by technology

[0006] 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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