Method for producing extruded polystyrene foam products by carbon dioxide foaming agent

Abstract

The invention relates to a method for producing extruded polystyrene foam products by a carbon dioxide foaming agent. The method comprises mixing polystyrene resin, talc powder, auxiliaries and pigment to form mixture, adding the mixture into a primary extruder to be heated and plastified and injecting the carbon dioxide foaming agent into the primary extruder through an injection device; injecting the foaming auxiliaries into the primary extruder; feeding the mixture into a secondary extruder via a filter screen after the mixture is sufficiently plastified and melted; and cooling and forming after the mixture is foamed by a mold, and rolling up the mixture via traction or cutting off the mixture to form the finished products. The method has the advantages that the density of extruded polystyrene sheets and plates which are produced by the carbon dioxide foaming agent is low, toughness is good, flame retardance is high, stretching strength is high, and physical performances and chemical performances are stable relatively.

Description

technical field [0001] The invention relates to a method for producing plastic foamed products, in particular to a method for producing polystyrene extruded foamed products by using a carbon dioxide foaming agent. Background technique [0002] The traditional foaming agents for plastic extrusion products are generally freon and alkanes. Freon is now a banned product, and the pollution is relatively serious. The use of alkanes is very dangerous. At present, carbon dioxide is a good substitute as a blowing agent, but carbon dioxide generally exists in a gaseous state, which is not easy to inject, and there are also problems such as injection is not easy to mix. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the invention provides a method for producing polystyrene extruded foamed products by using a carbon dioxide foaming agent with high foaming rate, good compression resistance, good stretchability and high strength. [0004] The technical ...

AI Technical Summary

Problems solved by technology

[0002] The traditional blowing agents for plastic extrusion products are generally freon and alkanes. Freon is now a banned product, and the pollution is relatively serious. The use of alkanes is very dangerous.

At present, carbon dioxide is a good substitute as a blowing agent, but carbon dioxide generally exists in a gaseous state, and it is not easy to inject, and there are also problems such as injection is not easy to mix.

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