Expandable polystyrene bead with superior adiabatic and flameproof effect and method for producing the same

Abstract

Disclosed herein is an expandable polystyrene bead having improved adiabaticity and flame- retardance and a method of producing the expandable polystyrene bead. The expandable polystyrene bead comprises 10 - 60 wt% of a flame retardant which is made of one or more selected from among metal or nonmetal oxides, metal or nonmetal hydroxides, silicates, borates and carbonates, having a particle size of 1-50[mu]m. Expanded polystyrene foam having improved adiabaticity and flame-retardance can be obtained using the expandable polystyrene bead. A thin flame-retardant thermal insulator including the expanded polystyrene foam can be widely used in various fire-related fields.

Description

technical field [0001] The present invention relates to expandable polystyrene beads (expandable polystyrene beads, expandable polystyrene bead) with improved thermal insulation and flame retardancy and a method for producing the same, and more particularly, to Expandable polystyrene bead of property and flame retardancy and method for producing it, this expandable polystyrene bead comprises 10-60wt% is selected from metal or metalloid oxide, metal or metalloid hydroxide One or more of compounds, silicates, borates and carbonates are used as flame retardants. Background technique [0002] Expanded polystyrene foam (Styrofoam) is widely used as a thermal insulator for insulating buildings. Expanded polystyrene foam is advantageous in that it is cheap, light, and has high processability, but has a disadvantage in that it is very poor in fire resistance and has lower thermal insulation than extruded polystyrene boards (XPS boards). Furthermore, expanded polystyrene foam has d...

AI Technical Summary

Problems solved by technology

[0005] The above technologies are similar to each other in that polystyrene contains graphite, the difference is that the preparation process is different from each other, and there is a problem that when the expandable polystyrene beads are initially expanded, aged expanded polystyrene beads , and then use the well-known particle method (particle method) to mold aged polystyrene beads to prepare expanded polystyrene foam, the adhesion between the particles is not good, so it is difficult to mold the polystyrene foam

Also, there is a problem with the final foamed polystyrene foam that its thermal insulation deteriorates over time because the graphite contained in polystyrene foam is highly absorbent

[0007] This technology is performed using a phenomenon in which aluminum reflects infrared rays, and there are problems in that although aluminum is expensive, the improvement in thermal insulation performance is not large, and the process is complicated, making economical insufficient, and as a result, the technology has not been put into practical use

[0012] As the above-mentioned technologies for adding various additives such as organic flame retardants, graphite, etc. to polystyrene resins, all have similar problems: the physical properties of the final product are unstable, toxic gases are generated when incinerated, and the flame retardancy is poor. little improvement

[0014] The problem with this technology (in which it is necessary to coat expanded beads with a very high volume with a flame retardant) is that it results in very high machinery installation costs, insufficient throughput and economics, and inconsistent quality of the final product , the improvement of flame retardancy is not large, and the foamed beads are not easy to be molded, so it is not put into practical use

The problem with this technique is that the yield of polystyrene foam is very low because the mixed liquid injected into the preformed polystyrene is not easy to dry, and there is a problem that due to the gap between the sodium silicate solution and the added substance The chemical reaction oxidizes the polystyrene foam over time, and the flame retardancy deteriorates when the foam dries

However, this technique has a problem in that the production cost of polystyrene foam increases excessively due to the use of relatively expensive zinc powder, and when the amount of zinc powder is increased for the purpose of improving flame retardancy, the resulting polystyrene foam becomes very heavy