Method and device for producing graphite flame-retardant extruded polystyrene board (XPS)

Abstract

The invention relates to a method and a device for producing an extruded polystyrene board (XPS). During production, materials are added into a primary screw rod, the materials are compressed and plasticized by the primary screw rod and are extruded into a secondary screw rod through a material channel, and a foaming agent is filled into the front section of the secondary screw rod. The method is characterized in that a graphite particle paste flame retardant is injected into the front section of the secondary screw rod, the materials, the foaming agent and the graphite particle paste flame retardant are mixed and cooled and pushed into a mold through the secondary screw rod, and finally, the mixture is ejected out of the mold so as to form a finished product. The addition of the graphite particle paste flame retardant can be increased as much as possible under the condition that the production requirements are met, the utilization efficiency of the flame retardant is improved, the flame retardant property of the product is improved, and the method has the advantages of high economical efficiency and environment friendliness.

Description

technical field [0001] The invention relates to a production method and a production device of a graphite flame-retardant XPS extruded foam board. Background technique [0002] XPS (extruded polystyrene foam board) extruded foam board has a closed-cell foam structure, so the thermal conductivity is small, and it has excellent thermal insulation performance. It is the first choice for various thermal insulation structures, but XPS extruded foam board is easy to The fire will be ignited at one point, so it is necessary to add a flame retardant to enhance its flame retardant performance, so that it can achieve the purpose of being flame retardant. [0003] There are two traditional production methods: [0004] One kind of flame retardant uses hexabromocyclododecane, which is widely used in China now. Its flame retardant effect can only exist in a short period of time, and it is not environmentally friendly. [0005] One is the compounding of expandable graphite (the graphite ...

AI Technical Summary

Problems solved by technology

Graphite is easy to refine in the first-stage screw, which will reduce the flame-retardant performance. Therefore, if too little graphite is added, the flame-retardant performance will not meet the standard; graphite is easy to refine in the first-stage screw. The increase of the surface area can make the material more lubricated, so adding too much graphite to the first-stage screw will cause the internal pressure of the first-stage screw to decrease and the pressure will be unstable, which will affect the normal production

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