Preparation technology of low-smoke and halogen-free ceramic polyolefin refractory insulation material

Abstract

The invention discloses a preparation technology of a low-smoke and halogen-free ceramic polyolefin refractory insulation material. The technology includes the steps of: 1. putting metallocene polyethylene, an ethylene-alpha-octene copolymer, high density polyethylene resin, maleic anhydride grafted amorphous polyolefin, pentaerythritol, boron carbide, silicon carbide, nano-aluminum hydroxide, brucite, talcum powder, an antioxidant, a silane coupling agent, sodium dodecylbenzene sulfonate and lubricant silicone masterbatch all into an internal mixer at one time for mixing, and performing discharging when the temperature of the mixed materials reaches 140-145DEG C; and 2. sending the material obtained in step 1 into a tapered feeding hopper, and conducting plasticizing extrusion by a twin-screw extrusion set. The polyolefin refractory insulation material obtained by the technology provided by the invention has good ceramic performance, the sintered ceramic shell has high bending strength, the crust is very hard and dense, no secondary fire is caused, and the refractory insulation material can be fired into a hard ceramic armor to reach very good heat insulation, cooling and refractory effects, has low smoke during combustion, is halogen-free, non-toxic and odorless, and passes the ROHS inspection standards.

Description

technical field [0001] The invention relates to the technical field of polyolefin refractory insulating materials, in particular to a preparation process for low-smoke and halogen-free ceramic polyolefin refractory insulating materials. Background technique [0002] Ceramic polymer refractory material is a new type of composite material with refractory function made of polymer as the matrix and adding a certain proportion of ceramic powder, flux and other additives. The material has good softness and mechanical properties at normal temperature, and after being fired at high temperature, it will be transformed into a hard ceramic protective layer after being fired at high temperature, and the protective layer has certain mechanical strength. [0003] Although the research on this aspect at home and abroad can be traced back to the 1930s, it has been developing slowly. It was not until recent years that the research on ceramic refractory cables increased, and ceramic refractor...

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Problems solved by technology

At present, ceramic silicone rubber is more researched in ceramic polymer refractory materials, but the disadvantage of ceramic silicone rubber cable material is that when it is used, it needs to be extruded by a special rubber extruder, and it is also It needs to be vulcanized through the vulcanization process, so the process is relatively complicated and the scope of application is limited; if the cable material is made into a silicone rubber tape and wrapped outside the cable core during the wire and cable processing process, the production efficiency is low and the cost is high , not conducive to industrial scale-up production

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