Flame-retardant semiconductive sheathing material for coal mine gas tubes, and preparation method and application thereof

Abstract

The invention discloses a flame-retardant semiconductive sheathing material for coal mine gas tubes, and a preparation method and application thereof. The flame-retardant semiconductive sheathing material comprises high-density polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-octene copolymer, a flame retardant and conductive carbon black. The flame retardant comprises ammonium polyphosphate, melamine cyanurate, and a combination of one or more of pentaerythritol and a derivative thereof; the conductive carbon black accounts for 30% or more of the raw materials by mass. The preparation method includes 1) mixing components of resin to obtain a first mixture; 2) mixing the other remaining raw materials to obtain a second mixture; 3) respectively feeding the first mixture and the second mixture into a main feeding bucket and a lateral feeding bucket of a twin-screw extruder, and performing melting and extruding to obtain the flame-retardant semiconductive sheathing material.The invention further provides a gas exhaust tube. The gas exhaust tube comprises an exhaust tube body and a sheath covering the exhaust tube body; the sheath is made from the sheathing material. Thesheathing material has the advantage that high electrical conductivity, high flame retardance and excellent mechanical property can be maintained.

Description

technical field [0001] The invention belongs to the field of coal mines, and in particular relates to materials for coal mine gas pipes, in particular to a flame-retardant semi-conductive sheath material for coal mine gas pipes and a preparation method and application thereof. Background technique [0002] In coal mine production, mine operations are very dangerous, and one of the main sources of danger is the gas generated, so it is necessary to discharge the gas. However, during the drainage process, the substance flowing in the discharge pipeline is mainly the main , and mixed with a certain amount of dust, these airflows with solid dust are in the pipeline (most of the polyolefin plastic pipes currently used are widely used because of their light weight, corrosion resistance, aging resistance, and easy installation) When the gas flows at a certain speed, the gas and solid dust will frequently rub and collide with the pipe wall, thereby generating strong static electricit...

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Problems solved by technology

[0002] In coal mine production, mine operations are very dangerous, and one of the main sources of danger is the gas generated, so it is necessary to discharge the gas. However, during the drainage process, the substance flowing in the discharge pipeline is mainly the main , and mixed with a certain amount of dust, these airflows with solid dust are in the pipeline (most of the polyolefin plastic pipes currently used are widely used because of their light weight, corrosion resistance, aging resistance, and easy installation) When the gas flows at a certain speed, the gas and solid dust will frequently rub and collide with the pipe wall, thereby generating strong static electricity, and even accompanied by spark discharge, the energy of the discharge spark is enough to ignite the gas, which is easy to cause fire or Gas explosions caused mine accidents. Although some improvements have been made to the discharge pipelines on the market, such as adding antistatic agents to reduce the possibility of static electricity, the effect is not ideal and there are great potential safety risks.

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