Water-phase suspension granulation method for preparing gradient flame-retardant foamable polystyrene beads on basis of waste polystyrene materials and products of water-phase suspension granulation method

Abstract

The invention belongs to the field of high-value recycling of waste polystyrene foam materials, and particularly relates to a water-phase suspension granulation method for preparing gradient flame-retardant foamable polystyrene beads on the basis of waste polystyrene materials and products of the water-phase suspension granulation method. The water-phase suspension granulation method includes forming oil phases by inorganic-organic gradient cooperative flame-retardant heat-insulation systems, organic solvents and the waste polystyrene materials; forming water-phase dispersion media by surfactants, inorganic-organic synergistic suspension agents and deionized water; stably suspending and dispersing oil-phase liquid drop in the water-phase media under the actions of mechanical stirring by means of water-phase suspension granulation; heating and steaming out the organic solvents to cure gradient flame-retardant polystyrene beads; acquiring gradient flame-retardant polystyrene heat-insulation plates by means of pentane filling and foaming molding. The waster-phase suspension granulation method and the products have the advantages that waste polystyrene is used as a raw material, is recycled by the aid of physical processes and is used for preparing the gradient flame-retardant foamable polystyrene beads, accordingly, waste can be utilized, and the gradient flame-retardant performance and heat-insulation effects of the gradient flame-retardant foamable polystyrene beads can be improved; the organic solvents can be recycled, accordingly, the water-phase suspension granulation method and the products are environmental friendly, and industrial production can be facilitated.

Description

technical field [0001] The invention belongs to the field of high-value recovery and utilization of waste polystyrene foam materials, and specifically relates to an aqueous phase suspension granulation method for preparing gradient flame-retardant expandable polystyrene beads based on waste polystyrene materials and a product thereof. Background technique [0002] Polystyrene foam material (Expandedpolystyrene referred to as EPS) is obtained by steam foaming of expandable polystyrene, which has excellent thermal insulation, sound insulation, shockproof, light weight, aging resistance and corrosion resistance, and is widely used In the field of building exterior wall insulation and packaging industry. EPS products are non-degradable and non-perishable, and are usually used for one-time use. After being discarded, they seriously pollute the environment, and the post-processing costs are high and the process is complicated. Therefore, the resource recycling and high-value recy...

AI Technical Summary

Problems solved by technology

[0004] At present, the recycling of waste EPS mainly adopts the solvent method. For example, the Chinese invention patent CN100335539C discloses a method for solvent regeneration and recycling of waste polystyrene foam. times the volume of alcohol or ether precipitant and other precipitant by vacuum filtration, the polystyrene after filtration is again added with 1 to 5 times the volume of orange oil alcohol or ether precipitant for second precipitation, and vacuum filtration again to obtain Irregular polystyrene aggregates, the solution filtered twice is extracted by adding an equal volume of water, and finally adding an auxiliary agent to distill and separate the solvent and the precipitant, and recover the solvent. This patent uses a natural non-toxic solvent orange oil, and the cost of orange oil High, the recovery process is very complicated, it is necessary to add alcohol or ether precipitant and additives, the distillation is very complicated and difficult to achieve, the recovery cost is high, and the obtained recycled polystyrene is an irregular aggregate, and there is no increase in polystyrene The performance and added value of ethylene are not conducive to industrial applications, such as subsequent utilization, which requires melt extrusion process and cutting granulation process

Chinese invention patent CN101230152B discloses a preparation method of waste polystyrene micron-sized ball star particles, dissolving waste polystyrene foam in an organic solvent to form an organic phase, and then mixing the organic phase with a water phase in which a surfactant is dissolved , through mechanical stirring and high-speed shear emulsification of surfactants to form a microemulsion, then add the microemulsion to the precipitant, and prepare micron-sized solid particles of the ball through the synergistic action of the temperature-changing precipitant. The invention adds the microemulsion to the precipitation Micron-sized polystyrene is prepared in the solvent, and the precipitant used is a solvent miscible with organic solvent and water, although reclaimed micron-sized polystyrene, the mixed solution that produced a large amount of water, organic solvent and precipitant in this invention is difficult to Separation, without mentioning how to deal with these waste liquids, while solving the pollution of waste polystyrene, it also brings secondary pollution, the cost is high, and the polystyrene particles of 9-120 microns are obtained, which does not give it a new life. performance, and no application value

The above-mentioned invention technology only recycles polystyrene materials, which has high cost, complicated process, and secondary pollution. It does not endow the recycled polystyrene materials with new functions and properties, and the products are not millimeter-sized beads, which does not improve waste polystyrene resources. The added value of chemical recycling has little application prospect, which is not conducive to the promotion and application of industrialization

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