Low-smoke halogen-free flame-retardant silane crosslinked cable material capable of being crosslinked at room temperature and preparation method of cable material

Abstract

The invention relates to a low-smoke halogen-free flame-retardant silane crosslinked cable material capable of being crosslinked at the room temperature and a preparation method of the cable material. The method is characterized by comprising the steps as follows: firstly, a twin-screw mixing extruder is used for mixing polyolefin elastomers and linear low-density polyethylene with part of unsaturated silane and part of a grafting initiator respectively and extruding the mixtures into particles; then a high-speed mixer is used for mixing the two kinds of prepared particles with ethylene-vinyl acetate copolymer resin, functional polyolefin resin, a flame retardant, an antioxidant and a processing aid; and finally, the twin-screw mixing extruder is used for extruding the mixture into particles, so that the low-smoke halogen-free flame-retardant silane crosslinked cable material capable of being crosslinked at the room temperature is obtained. The cable material is high in silane grafting rate and high in crosslinking activity, crosslinking can be directly performed at the room temperature when the cable material is prepared into wires and cables, time-consuming and energy-consuming procedures such as water boiling, sauna and the like can be avoided, a crosslinking method is simple and easy to implement, and more than half of the crosslinking time can be saved even when a water boiling or steam sauna crosslinking method is adopted. The cable material is low in cost, high in production efficiency, easy to operate and free from structural limits when being used for producing the wires and the cables, and the product performance is stable and reliable after crosslinking.

Description

Technical field [0001] The invention relates to a plastic particle and a preparation method thereof. Specifically, it is a low-smoke halogen-free flame-retardant silane cross-linked cable material that can be cross-linked at room temperature and a preparation method thereof. technical background [0002] Silane cross-linking is a commonly used material cross-linking method. It is easy to operate and is not restricted by the cable structure. It is widely used in the wire and cable industry. However, general silane cross-linked products have low reactivity and are not easy to cross-link at room temperature. After being made into wires and cables, they need to be processed for a long time in a high-temperature and high-humidity environment to achieve the required cross-linking degree. A large heated pool or a large steam sauna for boiling, and the boiling or sauna time is long, the area is large, the energy consumption is high, and it is not conducive to continuous production; at t...

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Problems solved by technology

However, the general silane cross-linking products have low reactivity and are not easy to cross-link at room temperature. After being made into wires and cables, they need to be treated for a long time in a high-temperature and high-humidity environment to achieve the required cross-linking degree. Therefore, it is necessary to build a supply cable A large heatable pool or a large steam sauna room for boiling, and the boiling or sauna takes a long time, occupies a large area, and consumes a lot of energy, which is not conducive to continuous production; Low-smoke halogen-free flame-retardant materials for flame retardants have poor cross-linking reliability and continuity, and in order to prevent hydrolysis of flame retardants, it is not suitable for long-term processing in high-temperature and high-humidity environments, so the physical properties are unstable. The situation is more prominent, especially in the application of low-smoke halogen-free flame-retardant materials with higher flame-retardant grades. Because the degree of cross-linking and physical properties are often difficult to meet the requirements, such materials are very rare in the market. Therefore, the manufacture of this Chemically cross-linked or radiation cross-linked high-flame-retardant, low-smoke and halogen-free materials are generally used for cables that require high flame-retardant grades, but their prices are high, the manufacturing cost is high, the subsequent cross-linking process is complicated, and the production efficiency is low.

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