Room-temperature silane cross-linked polyolefin and its preparation method

Abstract

The invention discloses a room-temperature silane cross-linked polyolefin and its preparation method. The preparation method comprises the following steps: mixing polyolefin in a 80-100DEG C open mill, rolling, sequentially adding a flame retardant filler, a filler, a softener and an antioxidant, mixing for 5-15min, adding a catalyst, mixing for 2-6min, and taking down to obtain a material A; mixing polyolefin in a 60-90DEG C open mill, rolling, sequentially adding a filler, an antioxidant and a water bringing agent, mixing for 5-15min, adding a silane coupling agent / silane absorbent mixture, mixing for 2-5min, and taking down to obtain a material B; and uniformly mixing the catalyst material A with the base material B according to a weight ratio of 95:4-6 at 60-90DEG C, mixing for 4-8min for tabletting, tabletting with a press vulcanizer at 165-175DEG C for 10-20min, and disposing the prepared sample at normal temperature for 24-120h to obtain the silane cross-linked polyolefin. The preparation method has the advantages of omitting of a water boiling cross-linking or water vapor bath cross-linking link, technology simplification and cost reduction, and a wire and cable sheath material prepared through using the silane cross-linked polyolefin has the advantages of good elasticity and flexibility, good flame retardation effect, and strong heat resistance and ageing resistance.

Description

technical field [0001] The invention relates to a cross-linked polyolefin and its preparation method, in particular to a silane cross-linked polyolefin cross-linked under natural conditions without boiling or water vapor and its preparation method, mainly for low-voltage (10KV) And the following wire and cable sheathing materials. Background technique [0002] Three crosslinking techniques are commonly used for crosslinking polyolefin polymers: peroxide crosslinking, radiation crosslinking and silane crosslinking. Silane crosslinking uses silane as a crosslinking agent to complete the crosslinking of polyolefin polymers through two processes of grafting and crosslinking. [0003] The traditional preparation methods of silane crosslinked polyolefins all require water boiling or water steam bath crosslinking process, which consumes a lot of energy. At present, many manufacturers have begun to develop polyolefin materials that can be cross-linked under natural conditions. In...

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Problems solved by technology

However, this cable material is mainly used to prepare wire and cable insulation materials, and cannot meet the requirements of low-smoke, halogen-free and flame-retardant wire and cable sheathing materials.

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