High-voltage halogen-free flame-retardant double-wall heat shrinkage tube and preparation method thereof

Abstract

The invention relates to a heat shrinkage tube, in particular to a high-voltage halogen-free flame-retardant heat-shrinkage tube and a preparation method thereof. The high-voltage halogen-free flame-retardant double-wall heat shrinkage tube comprises an outer-wall material and an inner-wall material; wherein the outer-wall material comprises the following ingredients in parts by weight: 80 parts of first polyolefin mixed resin, 10 parts of first auxiliary agent, 5 parts of flame retardant and 5 parts of auxiliary flame retardant; the inner-wall material comprises the following ingredients in parts by weight: 80 parts of second polyolefin mixed resin, 10 parts of second auxiliary agent, 5 parts of flame retardant and 5 parts of auxiliary flame retardant; and the preparation method comprises the following steps of: preparing the inner-wall material and the outer-wall material of the double-wall heat shrinkage tube, extruding, irradiating, expanding and molding. Compared with the traditional heat-shrinkage tube, the high-voltage halogen-free flame-retardant double-wall heat shrinkage tube has the technical characteristics that: as the flame retardant and the auxiliary flame retardant are adopted in the raw materials, the product has good flame retarding effect, high-temperature resistance, favorable performance, no pollution even in the combustion process, reduced cost, remarkable economic benefit and environment-friendly benefit and is suitable for large-scale popularization and application.

Description

1. Technical field: [0001] The invention relates to a heat-shrinkable tube, in particular to a high-pressure halogen-free flame-retardant double-wall heat-shrinkable tube and a preparation method thereof. 2. Background technology [0002] The heat-shrinkable double-walled tube currently on the market has an inner and outer two-layer structure, which is composed of a flame-retardant polymer outer layer with a shape memory function that can shrink radially after heating and an inner rubber layer that can melt and flow at the shrinkage temperature. After heating, the inner adhesive layer melts and flows to fill. It can be widely used in aviation, aerospace, shipbuilding, automobiles, home appliances, communications, petrochemical and other fields. Anti-corrosion, anti-vibration dislocation and other functions. In the formulation of conventional outer layer materials, halogen-containing flame retardants are used, which have the disadvantages of high smoke generation and high to...

AI Technical Summary

Problems solved by technology

However, in the prior art, there are many disadvantages of low quality, high cost or poor flame retardant effect for double-walled tubes with halogen-free flame retardants.