Aqueous phase suspension granulation method for preparing gradient flame-retardant expandable polystyrene beads based on waste polystyrene materials and its products

Abstract

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. It uses an inorganic-organic gradient synergistic flame-retardant heat insulation system, organic solvents and waste polystyrene materials to form an oil phase, and uses surfactants, inorganic-organic synergistic suspending agents and deionized water to form a water phase dispersion medium. , water phase suspension granulation makes the oil phase droplets stably suspended and dispersed in the water phase medium, the organic solvent is evaporated by heating to realize the curing of gradient flame retardant polystyrene beads, and the gradient flame retardant is obtained by filling and foaming with pentane Polystyrene insulation board. The invention uses waste polystyrene as raw material, recovers and prepares gradient flame-retardant expandable polystyrene beads by physical method, utilizes waste, improves its gradient flame-retardant performance and heat insulation effect at the same time, organic solvent can be recycled, and is environmentally friendly. Friendly, easy to industrialize production.

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] Expanded polystyrene foam material (Expanded polystyrene referred to as EPS) is obtained by steam foaming of expandable polystyrene. It has excellent heat insulation, sound insulation, shockproof, light weight, aging resistance and corrosion resistance. It is widely used It is 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 h...

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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