Expandable polystyrene beads prepared from expandable few-layer graphene and preparing method of expandable polystyrene beads

Abstract

The invention relates to expandable polystyrene beads prepared from expandable few-layer graphene and a preparing method of the expandable polystyrene beads.Electrochemical intercalation is carried out on natural flake graphite with concentrated sulfuric acid, and a graphite interlayer compound with the interlayer space enlarged is obtained; few-layer graphene is obtained through ultrasonic concussion layer removing, the few-layer graphene is subjected to secondary intercalation with a chemical method, water washing and drying, and the expandable few-layer graphene is obtained; then, the expandable few-layer graphene and polystyrene monomers are subjected to suspension polymerization, and the expandable polystyrene beads prepared from the expandable few-layer graphene is obtained.According to the expandable polystyrene beads prepared from the expandable few-layer graphene and the preparing method of the expandable polystyrene beads, the expandable few-layer graphene is introduced into expandable polystyrene, and expandable graphene can be highly and uniformly dispersed in the expandable polystyrene beads, so that high infrared reflectivity in a cavity of expandable polystyrene is ensured, the heat insulation performance is good, and the expandable few-layer graphene can show the flame-retardant effects of smothering flames and insulating heat radiation.The flame retardant grade of a foam plate prepared from the expandable polystyrene beads reaches the B1 grade, and the heat conductivity value ranges from 0.028 W / (m.K) to 0.032 W / (m.K).

Description

technical field [0001] The invention relates to a polystyrene foam material, especially expandable polystyrene beads containing expandable few-layer graphene with high flame retardancy and low thermal conductivity and a preparation method. Background technique [0002] Polystyrene foam is made of expandable polystyrene beads containing volatile liquid foaming agent, which are pre-expanded by heating. Because of its good thermal insulation and energy-saving properties, it is widely used in building materials, packaging and other fields. [0003] In order to obtain better flame retardant, thermal insulation effect: [0004] CN104231461A discloses "Graphite EPS Beads and Its Production Process". Polystyrene particles, foaming agent, surface-modified graphite powder and flame retardant are mixed to make graphite EPS beads. Because the graphite mixed is ordinary graphite, the number of layers is too many, the dispersion is not good, and it is easy to aggregate, resulting in ins...

AI Technical Summary

Problems solved by technology

[0006] CN103819597A discloses a kind of " preparation method of expandable polystyrene polymer containing graphene " because the graphene majority that Hummers method makes belongs to single-layer graphite, no longer expands (interlayer is opened) when encountering high temperature, can't achieve Asphyxiation of flame, insulation of heat radiation and contact with oxygen, etc., so the performance of flame retardant and heat insulation is still unsatisfactory

It is necessary to solve the problems that the existing graphene-polystyrene composite material preparation method uses graphene as raw material, which leads to high preparation cost, complicated process and unsuitability for large-scale industrial production

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