39 results about "Polystyrene bead" patented technology

The invention relates to the technical field of production of expandable polystyrene (EPS) beads, and discloses a production process of EPS beads, which comprises the following steps: preparing styrene monomer, deionized water, foaming agent, initiator, dispersing agent and stabilizer raw materials, accurately weighing various raw materials according to the production process and product requirements, and uniformly mixing according to a certain ratio to obtain the EPS beads. The preparation method comprises the following steps: sequentially adding the prepared raw materials into a reaction kettle, firstly adding deionized water, then quantitatively adding a styrene monomer, starting a stirrer, then sequentially adding auxiliaries such as an initiator, a dispersing agent and a stabilizer, and continuously stirring and uniformly mixing to carry out polymerization reaction. According to the present invention, the modern expandable polystyrene bead production process mostly adopts the automatic production line, the continuous and stable production can be achieved, the production efficiency is improved, the styrene monomer, the initiator and the foaming agent are simultaneously added into the reaction kettle in the new preparation production process, the production process is simplified, the production links are reduced, and the production cost is reduced. Therefore, the production efficiency is further improved.

The invention relates to the technical field of layered composite materials, in particular to a flame-retardant wave-absorbing material based on expanded polystyrene and a preparation method of the flame-retardant wave-absorbing material. The preparation method comprises the following steps: compounding a graphene azide / ferroferric oxide composite material and propargyl linear phenolic resin through a click chemical reaction, compounding the obtained wave absorbing agent with phenolic resin, flame-retardant functional phenolic resin and ammonium polyphosphate to form flame-retardant coating resin, mixing the flame-retardant coating resin with pre-foamed polystyrene beads, and performing secondary foaming to obtain the flame-retardant polystyrene composite material. And taking the expanded polystyrene-based composite material as a middle layer, and carrying out composite hot pressing on the expanded polystyrene-based composite material, the upper layer and the lower layer to obtain the flame-retardant wave-absorbing material based on expanded polystyrene. The composite material has excellent flame retardant property and wave absorbing property.

This invention provides an environmentally friendly expandable polystyrene bead and its preparation process, belonging to the field of foaming material technology. The preparation process includes the following steps: S1, injecting 65.28g of deionized water into a reaction vessel, stirring, adding 0.13g of dispersant and 0.16g of composite stabilizer, dispersing for 20min, then adding 31.95g of styrene monomer and 0.3g of composite initiator, followed by the addition of pentane and SiO2 micelle composite to obtain a base solution; wherein the mass ratio of pentane to SiO2 micelle composite is 1:(0.2-0.3); the mass of pentane is 3.1%-3.2% of the mass of the base solution; S2, subjecting the base solution to stepwise heating at 86℃-140℃ with stirring, then stopping heating, continuing stirring, and allowing it to cool naturally to 40℃, then stopping stirring, with a total reaction time of 8.5-9.5h to obtain the reaction product; S3, discharging the material, washing the reaction product with warm water, filtering, and obtaining the environmentally friendly expandable polystyrene beads. This invention improves the average particle size of expandable polystyrene beads while reducing fine powder.

This invention relates to the field of polymer materials technology, and provides a method for preparing halogen-free flame-retardant polystyrene beads and expandable polystyrene beads from waste polystyrene. The invention uses a non-water-soluble composite halogen-free flame retardant and waste polystyrene as raw materials, employing a dissolution-distillation-suspension method to effectively composite the flame retardant and polystyrene, thus preparing halogen-free flame-retardant polystyrene beads. A foaming agent is then added to prepare halogen-free flame-retardant expandable polystyrene beads. The method provided by this invention is simple, energy-saving, emission-reducing, and environmentally friendly. The resulting halogen-free flame-retardant expandable polystyrene beads exhibit excellent flame-retardant properties, solving the "white pollution" problem caused by waste polystyrene and the safety hazards of storing polystyrene as a flammable material. It also reduces resource waste caused by traditional processing methods and the large consumption of petroleum resources in polystyrene production, aligning with the national "dual-carbon" strategic goal and possessing broad prospects.

The invention provides a graphite-grade expandable polystyrene bead body and a preparation process thereof, and belongs to the technical field of expandable polystyrene, the preparation process comprises the following steps: S1, injecting 150-230 parts by weight of deionized water into a reaction kettle, adding 0.5-1 part by weight of a dispersion stabilizer, stirring, and cooling to room temperature to obtain a graphite-grade expandable polystyrene bead body; adding 100 parts of styrene, 3.3-3.8 parts of intercalation-modified double-modified graphite, 0.3-0.35 part of an initiator and 0.9-1.1 parts of a phosphorus-nitrogen intumescent flame retardant, continuously stirring, heating to 86-90 DEG C, and keeping the temperature for 7-9 hours to obtain a particle dispersion phase; s2, adding 5.6-6.2 parts of a foaming agent into the particle dispersion phase, heating to 120 DEG C, continuously reacting for 4.5-5.5 hours, cooling, discharging, cleaning and filtering to obtain graphite-grade expandable polystyrene beads; the intercalation-modified double modified graphite is prepared by carrying out surface modification on oxidized intercalated graphite through poly (1, 3-propanediol succinate). According to the invention, excellent thermal stability of the prepared product is ensured, and the flame retardance of the product is improved.

The described method leverages nanosphere lithography (NSL) using nanoparticles having Young's modulus of at least 5 GPa, such as silica beads, to create high-density, periodic DNA origami nanoarrays on glass surfaces. In some aspects, by employing 1 μm silica beads, which have a higher Young's modulus compared to polystyrene beads, the sticky patch size (100 nm) is spaced out by 1 μm while maintaining DNA origami structures per spot. The resulting nanoarray consists of sticky patches with single DNA origami. This clean room-free fabrication method significantly reduces the cost per chip, while enabling precise positioning of target molecules at high throughput.

A method of fabricating plasmonic gold prism arrays for digital surface enhanced Raman spectroscopy, a plasmonic gold prism array arranged on a substrate for digital surface enhanced Raman spectroscopy, and a method of using a plasmonic gold prism array that is arranged on a substrate for digital surface enhanced Raman spectroscopy are disclosed. The method of fabricating plasmonic gold prism arrays for digital surface enhanced Raman spectroscopy includes depositing more than one layers of chromium and gold onto a plasmonic substrate comprising a monolayer of polystyrene beads and removing the monolayer of polystyrene beads under sonication in ethanol.

The invention relates to the technical field of wave-absorbing materials, in particular to a flame-retardant wave-absorbing material based on polystyrene foam and a preparation method of the flame-retardant wave-absorbing material. One-dimensional magnetic sepiolite fibers and two-dimensional modified graphene oxide are used as raw materials, composite aerogel with a three-dimensional oriented porous structure is prepared through freeze drying, and the composite aerogel, a flame retardant, a film-forming agent, a dispersing agent, a defoaming agent and deionized water are mixed to obtain the wave-absorbing coating. And putting the expanded polystyrene beads into the wave-absorbing coating, uniformly stirring, drying, and molding to obtain the flame-retardant wave-absorbing material based on polystyrene foam. The flame-retardant wave-absorbing material based on polystyrene foam prepared by the invention not only has excellent wave-absorbing performance, but also has excellent flame-retardant performance and mechanical performance.

The invention provides an environment-friendly expandable polystyrene bead and a preparation process thereof, and belongs to the technical field of foaming materials.The preparation process includes the steps that S1, 65.28 g of deionized water is injected into a reaction kettle, stirring is conducted, 0.13 g of dispersing agent and 0.16 g of compound stabilizer are added, after dispersion is conducted for 20 min, 31.95 g of styrene monomer and 0.3 g of compound initiator are added, then pentane and SiO2 micelle complex is added, and a basic solution is obtained; wherein the mass ratio of the pentane to the SiO2 micelle complex is 1: (0.2-0.3); the mass of the pentane is 3.1%-3.2% of the mass of the basic solution; s2, stepwise heating the basic solution at 86-140 DEG C, carrying out stirring reaction, then stopping heating, continuously stirring, naturally cooling to 40 DEG C, stopping stirring, and carrying out total reaction for 8.5-9.5 hours to obtain a reaction product; and S3, discharging, washing a reaction product with warm water, and filtering to obtain the environment-friendly expandable polystyrene bead. According to the method, the average particle size of the prepared expandable polystyrene beads is increased, and meanwhile, fine powder is reduced.

Disclosed herein are dry-mix and wet-mix compositions for lightweight plasters, kits for preparing lightweight plasters, lightweight plasters, and methods of making lightweight plasters. A dry-mix composition comprises a hydratable binder and polymer beads, the polymer beads having a mean equivalent particle diameter of no greater than 2.5 mm. A kit for preparing lightweight plasters comprises the dry mix composition and an accelerator composition. A method for preparing a plaster comprises mixing the dry-mix composition with water to prepare a wet mix composition, applying the wet mix composition to a surface of a substrate, and allowing the wet mix composition to dry to form a plaster.

The disclosure features calibration fluids that include a plurality of beads, such as cellulose, silica, poly(methyl-methacrylate) (PMMA), melamine, cross-linked agarose, polyvinylacetate (PVA), and / or polystyrene beads, where the beads are sized and colored to represent at least one type of blood cell; and a carrier fluid, that can include a polymer or polymerizing matrix, e.g., a water-soluble resin, e.g., an acrylic or polyurethane water-soluble resin or a starch or a cellulose, serum, and / or one or more or sugars. The disclosure also features methods of using the calibration fluids to calibrate automated sample preparation systems, such as automated hematology analyzer systems, e.g., image-based hematology analyzer systems.

The invention provides a flame-retardant expandable polystyrene bead and a preparation method thereof, and belongs to the technical field of polystyrene beads, the flame-retardant expandable polystyrene bead is prepared from the following raw materials by weight: 20 parts of a styrene monomer, 0.20-0.25 part of an organic dispersant, 0.05-0.15 part of an inorganic dispersant, 0.75-0.85 part of a foaming agent, 3.8-4.2 parts of a hyperbranched core-shell flame retardant, 0.4-0.6 part of an initiator and 90-110 parts of water, wherein the hyperbranched core-shell flame retardant is prepared by carrying out shell coating and hyperbranched treatment on expanded graphite, and the hyperbranched core-shell flame retardant is added in the polystyrene polymerization process, so that the expanded graphite has good compatibility with a polymer matrix, and meanwhile, a matrix material can be effectively coated and protected after high-temperature expansion; the finally prepared polystyrene foam material has good flame retardant property, and can maintain high compressive strength at the same time.

The invention provides a copper oxide porous nanoflower catalyst and a preparation method and application thereof.The catalyst is in a porous flower shape, the size of nanoflowers ranges from 1.8 micrometers to 2.2 micrometers, the thickness of nanoflowers ranges from 50 nanometers to 150 nanometers, and the pore diameter of nanoflowers ranges from 100 nanometers to 150 nanometers. The preparation method comprises the steps that copper salt, ammonia water and polystyrene spheres are fully mixed and then subjected to a complete hydrothermal reaction at the temperature of 70 DEG C to 120 DEG C, and the copper oxide porous nanoflower catalyst is obtained. And after cooling, centrifuging, washing and drying, washing away the residual polystyrene template by using a solvent, and centrifuging and thoroughly drying to obtain the copper oxide porous nanoflower catalyst. The obtained copper oxide porous nanoflower catalyst can be used for a carbon monoxide electroreduction reaction, the prepared catalyst has high carbon monoxide electroreduction electroreaction catalytic activity by introducing a nanometer hole structure on the nanometer size, and the high yield of carbon monoxide to multi-carbon products and the single selectivity of ethylene products are achieved.

A dry mix of a thermally insulating fill material for backfilling and / or filling. The fill material includes a cement-based binder and a thermally insulating material, and the thermally insulating material is newly foamed monograin polystyrene beads.

The invention relates to the technical field of polystyrene, and provides a polystyrene bead with high foaming ratio and a preparation method thereof, the polystyrene bead with high foaming ratio comprises the following raw materials by weight: 85-95 parts of polystyrene, 1-10 parts of organic rectorite, 2-4 parts of a foaming agent, and 3-6 parts of a flexibilizer; the preparation method of the organic rectorite comprises the following steps: A1, mixing sodium salt and rectorite slurry, and aging to obtain turbid liquid; a2, a cationic surface active agent is added into the turbid liquid for mixing and drying, and pretreated rectorite is obtained; and A3, mixing the pretreated rectorite with benzenesulfonyl hydroxamic acid, and drying to obtain the organic rectorite. According to the technical scheme, the problem that the compression strength of a polystyrene product prepared from the polystyrene beads with high foaming ratio in the prior art is relatively low is solved.

The invention relates to the technical field of foaming materials, in particular to a foaming filling buoy material and a preparation method thereof. According to the material, polystyrene beads are used as a matrix and matched with a main foaming agent, an auxiliary foaming agent, a dispersing agent, a cross-linking agent, a nucleating agent and a toughening agent, fluorosilicone-polyvinyl alcohol compound powder and a chitosan oligosaccharide ester modifier are specially added, and meanwhile, the process of heating rate and feeding window is used for accurate control; the problems of high water absorption rate, mechanical property attenuation and unstable size of a traditional foaming material in a high-humidity environment are solved. The obtained foaming buoy material is low in density and high in compression resistance and impact resistance, the water vapor transmission rate and the damp-heat size change rate are remarkably reduced, the comprehensive performance of high strength, low water permeability and stable size in a high-humidity environment is achieved, and the foaming buoy material can be widely applied to the bearing fields of ocean buoys, overwater structures and other long-term exposed damp-heat environments.

The present disclosure relates to the use of 50-515 ppm of at least one polymerization inhibitor as an additive in a suspension radical polymerization comprising styrene monomer and polystyrene for improving the cell structure of expanded polystyrene produced from expandable polystyrene beads obtained from said suspension polymerization, wherein said 50-515 ppm is the total amount of polymerization inhibitor added relative to the initial amount of styrene monomer in the suspension polymerization.

To provide a set of molds for manufacturing expanded polystyrene (EPS) pallets, a method for manufacturing a set of molds for manufacturing EPS pallets, and a method for manufacturing EPS pallets using the set of molds.SOLUTION: A set of molds includes a leg mold designed to manufacture modular platform molds, EPS pallet platform sections, and multiple leg support sections. The modular platform mold has a modularized unit, and this modularized unit enables changing the dimensions of the hollow space configured to receive polystyrene bead feedstock, thereby enabling the molding of platform sections of various dimensions from a single mold. One or more leg support sections are attached to the bottom side of the platform section at predetermined locations based on load-bearing capacity and lifting position to form an EPS pallet.SELECTED DRAWING: Figure 2a

The present invention relates to an admixture composition for the production of lightweight concretes containing polystyrene beads, which comprises a mixture of organic and inorganic substances which consists of the reaction products of polyurethane resin, tetraethyl orthosilicate, a glycol compound, an aromatic vinyl compound containing an unsaturated double bond, preferably styrene, and an inorganic silicate compound and preferably comprises the following components: glycol copolymer type compounds, in an amount of 15-10 w / w %, glycol polymer-silica type compounds, in an amount of 45-50 w / w %, polyurethane-b as ed resin, in an amount of 13-22 w / w % polystyrene in an amount of 2-3% w / w %, and foam glass beads in an amount of 25-15 w / w %, and a) for the production of a liquid product, based on the total mass of the above composition, organic solvents in an amount of 15-20 w / w %, and water in an amount of 10-5 w / w %; or b) for the production of a solid preparation, based on the total mass of the above composition, polyvinyl acetate or polyvinyl alcohol in an amount of 10-5 w / w %; aluminium hydroxide in an amount of 2-5 w / w %, and calcined limestone powder in an amount of 8-10 w / w %. The invention also relates to the production and use of the above admixture composition.

This invention discloses expandable recycled polystyrene beads and their preparation method, relating to the field of waste plastic recycling and functional polymer materials technology. The raw materials, by weight, include: 100 parts waste polystyrene material; 10-30 parts solvent; 5-15 parts physical foaming agent; 0.5-2 parts surface coating material; 0-5 parts compatibilizer; and 0-2 parts nucleating agent. The preparation method includes raw material pretreatment, solvent-assisted swelling, low-temperature granulation, foaming agent loading, surface coating, and drying steps. This expandable recycled polystyrene bead and its preparation method, through solvent-assisted swelling and supercritical CO2-assisted foaming agent loading, achieve uniform dispersion of the foaming agent in the recycled material, with a closed-cell rate ≥90%, solving the problems of uneven loading and poor cell structure of traditional physical foaming agents. The prepared expandable recycled polystyrene beads are suitable for building insulation, cushioning packaging, lightweight composite materials, transportation, and buoyancy materials.

The present invention relates to the technical field of laminated composite materials, and particularly relates to a flame-retardant wave-absorbing material based on expanded polystyrene and a preparation method thereof. The preparation method includes: compounding a graphene azide / ferroferric oxide composite material with propargylated novolac resin through click chemical reaction to obtain a wave-absorbing agent, and compounding the wave-absorbing agent with phenolic resin, flame-retardant functionalized phenolic resin, and ammonium polyphosphate to form a flame-retardant coated resin. After mixing with pre-expanded polystyrene beads, secondary foaming is carried out to obtain an expanded polystyrene-based composite material. Using this as an intermediate layer, it is compounded and hot-pressed with the upper layer and the lower layer to obtain a flame-retardant wave-absorbing material based on expanded polystyrene. This composite material has excellent flame-retardant performance and wave-absorbing performance.

The present application relates to wave-absorbing material technical field, specifically to a kind of flame-retardant wave-absorbing material based on polystyrene foam and preparation method thereof.The present application uses one-dimensional magnetic sepiolite fiber and two-dimensional modified graphene oxide as raw material, three-dimensional directional porous structure composite aerogel is prepared by freeze drying, composite aerogel, flame retardant, film forming agent, dispersing agent, defoaming agent and deionized water are obtained to obtain wave-absorbing coating;Foamed polystyrene beads are put into wave-absorbing coating, and after stirring evenly, drying, molding, the flame-retardant wave-absorbing material based on polystyrene foam is obtained.The flame-retardant wave-absorbing material based on polystyrene foam prepared by the present application not only has excellent wave-absorbing performance, but also has excellent flame-retardant performance and mechanical properties.

The invention discloses a heat-resistant polystyrene foam material and a preparation method thereof. Comprising the following steps: step 1, mixing a styrene monomer, an initiator, a dispersing agent, water, a foaming agent and modified graphene, adding the mixture into a reaction kettle, and performing washing, centrifugal separation and drying to obtain expandable polystyrene beads; 2, polystyrene beads are pre-foamed for 1-2 h at the temperature of 80-90 DEG C and placed for 10-15 h for curing, and a pre-foamed material is obtained; 3, the pre-foaming material is placed in a mold, the temperature is increased to 100-130 DEG C, secondary foaming is conducted for 2-3 min, and after cooling and shaping, the polystyrene foaming material is obtained. The preparation method has the beneficial effects that the graphene oxide is modified by synthesizing the modifier with an acetal spiro structure, and double bonds are introduced to copolymerize with the styrene monomer, so that the heat resistance and the mechanical property of the obtained polystyrene foaming material are improved.

The invention relates to the technical field of high polymer material recycling and reusing, in particular to an auxiliary agent of a modified polystyrene reclaimed material and a preparation method of expandable polystyrene beads. The invention provides an auxiliary agent of a modified polystyrene reclaimed material. The auxiliary agent comprises 1-1.5 parts of a nucleating agent, 1-2 parts of a modifier and 0.5-3 parts of a lubricant, the modifier comprises one or more of an OPS (oriented polystyrene) reclaimed material, a styrene-maleic anhydride copolymer, an ethylene-vinyl acetate copolymer and a POE (polyolefin elastomer). The auxiliary agent can enable the final product to have relatively strong compression strength and flexibility, uniform cell density and light weight.

The application provides a kind of graphite grade expandable polystyrene beads and its preparation process, belong to expandable polystyrene technical field, the preparation process includes steps: S1, according to weight fraction, 150-230 parts of deionized water is injected into reaction kettle, 0.5-1 parts of dispersion stabilizer is added, stirring, 100 parts of styrene, 3.3-3.8 parts of intercalation-modified double modified graphite, 0.3-0.35 parts of initiator and 0.9-1.1 parts of phosphorus-nitrogen system intumescent flame retardant are added, continue to stir, heat to 86-90 DEG C, constant temperature 7-9 h, obtain granular dispersion phase;S2, 5.6-6.2 parts of foaming agent is added to granular dispersion phase, temperature is raised to 120 DEG C, after continuous reaction 4.5-5.5 h, cooling, discharge, cleaning, filtration, the graphite grade expandable polystyrene beads are obtained;Intercalation-modified double modified graphite is prepared by surface modification of polybutylene succinate-1,3-propanediol ester from oxidized intercalation graphite.The application ensures that the product prepared has excellent thermal stability, and improves its flame retardance.

This application relates to the field of polymer materials, and specifically discloses a graphite-modified polystyrene bead and a preparation method thereof. A graphite-modified polystyrene bead, the raw materials used include graphite filler, flame retardant, antioxidant, lubricant, nucleating agent, pentane, antistatic agent and general polystyrene. The graphite filler is prepared by the following method: impregnating graphite particles in a pretreatment liquid according to a solid-liquid ratio of 1:(10-12), and performing heat treatment for 60-75 minutes to obtain the graphite filler. The pretreatment liquid includes sodium dihydrogen phosphate, sodium tetraborate, cashew phenol surfactant and water with a weight ratio of 10:(8-12):6.5:100; its preparation method is: feeding, proportioning and mixing, melt extrusion, decompression, pelletizing, cooling, drying, screening, coating, to obtain graphite-modified polystyrene beads. The products of this application have good flame retardancy, heat resistance and mechanical properties at the same time.

This invention provides a flame-retardant expandable polystyrene bead and its preparation method, belonging to the field of polystyrene bead technology. By weight, it is prepared from the following raw materials: 20 parts styrene monomer, 0.20-0.25 parts organic dispersant, 0.05-0.15 parts inorganic dispersant, 0.75-0.85 parts foaming agent, 3.8-4.2 parts hyperbranched core-shell flame retardant, 0.4-0.6 parts initiator, and 90-110 parts water. The hyperbranched core-shell flame retardant is obtained by shell coating and hyperbranching of expanded graphite. Adding the hyperbranched core-shell flame retardant during the polystyrene polymerization process ensures good compatibility between the expanded graphite and the polymer matrix. Simultaneously, after high-temperature expansion, it effectively encapsulates and protects the matrix material. The resulting polystyrene foam material exhibits excellent flame-retardant properties while maintaining high compressive strength.

The present invention discloses anti-adhesive cationic golf-shaped microspheres and a method for separating and purifying small extracellular vesicles using the same. The anti-adhesive cationic golf-shaped microspheres are prepared by heterogeneously agglomerating soft silicone oil droplets and amphoteric polystyrene beads with a particle size of 100 to 200 nm, followed by adhesion of a phase-transition bovine serum albumin nanofilm and rapid etching with tetrahydrofuran. The anti-adhesive cationic golf-shaped microspheres of the present invention can quickly and easily separate small extracellular vesicles from a sample through size and electrostatic effects, and are of great significance in the field of small extracellular vesicle separation. Compared to the current separation technology based on a single characteristic commonly used for the separation of small extracellular vesicles, the present invention overcomes the shortcomings of low purity of small extracellular vesicle separation and poor product integrity, providing a guarantee for the separation and enrichment of small extracellular vesicles in biological samples such as blood, cell culture fluid, and urine.

The invention relates to the field of high polymer materials, and particularly discloses a graphite modified polystyrene bead and a preparation method thereof. The graphite modified polystyrene bead comprises the following raw materials: a graphite filler, a flame retardant, an antioxidant, a lubricant, a nucleating agent, pentane, an antistatic agent and general purpose polystyrene, and the graphite filler is prepared by the following steps: immersing graphite particles in a pretreatment solution according to a solid-to-liquid ratio of 1: (10-12), and carrying out heat treatment for 60-75 min to obtain the graphite filler, the pretreatment liquid comprises sodium dihydrogen phosphate, sodium tetraborate, a cardanol surfactant and water in a weight ratio of 10: (8-12): 6.5: 100; the preparation method comprises the following steps: feeding, mixing ingredients, melting and extruding, reducing pressure, dicing, cooling, drying, screening and coating to obtain the graphite modified polystyrene beads. The product provided by the invention has good flame retardant property, heat resistance and mechanical property.

The present invention relates to flame-retardant polystyrene beads, flame-retardant polystyrene insulation boards, and a preparation method. The method comprises the following steps: pre-foaming and aging the polystyrene beads; the raw material of the polystyrene beads includes 10-15% by mass of a flame retardant; adding the aged pre-foamed polystyrene beads to ungelled SiO2 hydrogel and mechanically stirring until the SiO2 hydrogel completely covers the surface of the polystyrene beads; adding a phosphoric acid solution until gelation occurs and reacting for 10-20 minutes; then adding a NaOH solution to adjust the pH of the system to 9.5-10 to obtain polystyrene beads coated with SiO2 wet gel; aging the polystyrene beads coated with SiO2 wet gel, surface-modifying them, and supercritical drying them to obtain the flame-retardant polystyrene beads. The technical problem to be solved is how to improve the flame retardancy and thermal insulation properties of polystyrene insulation materials so that their thermal conductivity is ≤0.026W / (m·K), their limiting oxygen index is ≥35%, their vertical combustion grade reaches V0, and their horizontal combustion grade reaches V2 to V1.