Polystyrene foam beads and their preparation methods, polystyrene foam molded bodies
By modifying the preparation method of polystyrene foam beads, the problem of low cell density in polystyrene foam materials has been solved, and polystyrene foam beads with high cell density have been achieved, thereby improving their performance in fields such as safety protection and building materials.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
- Filing Date
- 2023-06-26
- Publication Date
- 2026-07-17
AI Technical Summary
Existing polystyrene foam materials have low cell density, making it difficult to prepare polystyrene foam materials with high cell density, resulting in poor compressive and impact resistance in fields such as safety protection and building materials.
Polystyrene is mixed with fluoropolymers and/or silicon-containing polymer modifiers and granulated, and then saturated under a pressure of 2MPa to 8MPa to form polystyrene foam beads with a high cell density of 10¹⁰ cells/cm³ to 10¹³ cells/cm³, a bulk density of 50g/L to 170g/L, and a cell diameter of 5μm to 50μm.
The polystyrene foam beads prepared can be used to make molded bodies with excellent compressive and impact resistance, and are suitable for fields such as safety protection, thermal insulation packaging and building materials.
Smart Images
Figure HDA0004302298350000011 
Figure HDA0004302298350000012
Abstract
Description
Technical Field
[0001] This invention relates to the field of foamed materials technology, and in particular to a polystyrene foamed beads and its preparation method, as well as a polystyrene foamed molded body. Background Technology
[0002] Polystyrene foam has the advantages of being lightweight, heat-insulating, and shock-absorbing, and is often used in insulated packaging, shock absorption, and other fields. However, as an amorphous random polymer, the highest cell density of polystyrene foam prepared by current foaming methods can only reach 10. 9 pcs / cm 3 It is difficult to prepare polystyrene foam materials with high pore density, and the polystyrene foam molded bodies prepared using this polystyrene foam material have poor performance, especially when used in fields such as safety protection and building materials, they are difficult to provide excellent compressive and impact resistance. Summary of the Invention
[0003] Therefore, it is necessary to provide polystyrene foam beads and their preparation method, as well as polystyrene foam molded bodies, to address the above problems. The preparation method can obtain polystyrene foam beads with high pore density, and the polystyrene foam molded bodies prepared using these beads have excellent compressive and impact resistance.
[0004] A method for preparing polystyrene foam beads includes the following steps:
[0005] Polystyrene, a modifier, and an additive are mixed and granulated to obtain modified polystyrene microparticles, wherein the modifier is selected from fluoropolymers and / or silicon-containing polymers;
[0006] The modified polystyrene microparticles are saturated to obtain saturated microparticles, wherein carbon dioxide at a pressure of 2 MPa to 8 MPa is introduced during the saturation process.
[0007] The saturated microparticles are heated to obtain polystyrene foam beads. The bulk density of the polystyrene foam beads is 50 g / L to 170 g / L, the cell diameter is 5 μm to 50 μm, and the cell density is 10. 10 pcs / cm 3 ~10 13 pcs / cm 3 .
[0008] In one embodiment, the saturation process takes 2 to 12 hours.
[0009] In one embodiment, the heating temperature for the step of heating the saturated particles is 90°C to 130°C, and the heating time is 30s to 300s.
[0010] In one embodiment, the mass ratio of the polystyrene, the modifier, and the additive is 100:2 to 20:0.1 to 1.
[0011] In one embodiment, the fluoropolymer is selected from at least one of polytetrafluoroethylene, polytrifluoroethylene, ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride, or polyvinylidene fluoride.
[0012] In one embodiment, the silicon-containing polymer is selected from at least one of polysiloxane, polycarbosilane, or polynitrosilane.
[0013] In one embodiment, the polystyrene has a weight-average molecular weight of 150,000 to 300,000.
[0014] In one embodiment, the additive is selected from at least one of nucleating agents, antioxidants, UV stabilizers, colorants, or flame retardants; wherein the nucleating agent is selected from at least one of talc, kaolin, zinc borate, and nanoclay.
[0015] A polystyrene foam beads prepared by the above-described method.
[0016] A polystyrene foamed molded body prepared using the above-mentioned polystyrene foamed beads.
[0017] The method for preparing polystyrene foam beads provided by this invention involves first mixing polystyrene with a modifier containing a fluoropolymer and / or a silicone polymer to obtain modified polystyrene microparticles, and then subjecting them to saturation treatment under a pressure of 2 MPa to 8 MPa. Through the synergistic effect of the mixtures, foaming can be achieved to obtain a cell density of 10. 10 pcs / cm 3 ~10 13 pcs / cm 3 High-pore-density polystyrene foam beads with a bulk density of 50 g / L to 170 g / L and a pore diameter of 5 μm to 50 μm.
[0018] Furthermore, polystyrene foamed molded bodies made from the high-pore-density polystyrene foamed beads have excellent compressive and impact resistance properties and can be used in fields such as safety protection, thermal insulation packaging, and building materials. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is an electron microscope image of the polystyrene foam beads of Example 1 of the present invention;
[0021] Figure 2 This is an electron microscope image of the polystyrene foam beads of Comparative Example 1 of the present invention. Detailed Implementation
[0022] To facilitate understanding of the present invention, it will be described in more detail below. However, it should be understood that the present invention can be implemented in many different forms and is not limited to the embodiments or examples described herein. Rather, these embodiments or examples are provided to make the disclosure of the present invention more thorough and complete.
[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments or examples only and is not intended to limit the invention. The optional scope of the term "and / or" as used herein includes any one of two or more of the related listed items, as well as any and all combinations of the related listed items, including any two related listed items, any more related listed items, or a combination of all related listed items.
[0024] The method for preparing polystyrene foam beads provided by the present invention includes the following steps:
[0025] S1, polystyrene, modifier and additives are mixed and granulated to obtain modified polystyrene microparticles, wherein the modifier is selected from fluoropolymers and / or silicon-containing polymers;
[0026] S2, the modified polystyrene microparticles are saturated to obtain saturated microparticles, wherein carbon dioxide at a pressure of 2MPa to 8MPa is introduced during the saturation process;
[0027] S3, the saturated microparticles are heated to obtain polystyrene foam beads. The bulk density of the polystyrene foam beads is 50 g / L to 170 g / L, the cell diameter is 5 μm to 50 μm, and the cell density is 10. 10 pcs / cm 3 ~10 13 pcs / cm 3 .
[0028] In step S1, polystyrene, modifier, and additives are mixed and granulated. Specifically, the method of mixing and granulating polystyrene, modifier, and additives is not limited. Preferably, polystyrene, modifier, and additives are mixed, melted, and extruded in an extruder for granulation. During the mixing and melting process, the melting temperature is 170℃~200℃. Optionally, the extruder can be divided into temperature zones to further enhance the uniform blending effect, resulting in more uniform modified polystyrene microparticles.
[0029] Optionally, the weight-average molecular weight of the fluoropolymer and / or the silicon-containing polymer is 1,000 to 30,000, which can further improve the blending effect of the modifier and polystyrene, as well as improve the distribution of the fluoropolymer and / or the silicon-containing polymer in the modified polystyrene particles, thereby further improving the saturation effect of carbon dioxide in the modified polystyrene particles during the saturation process.
[0030] Optionally, the polystyrene may be selected from general-purpose polystyrene, wherein the weight-average molecular weight of the polystyrene is 150,000 to 300,000.
[0031] Optionally, the fluoropolymer is selected from at least one of polytetrafluoroethylene, polytrifluoroethylene, ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride, or polyvinylidene fluoride, preferably polytetrafluoroethylene and / or polyvinylidene fluoride.
[0032] Optionally, the silicon-containing polymer is selected from at least one of polysiloxane, polycarbosilane, or polynitrosilane, preferably polycarbosilane.
[0033] Optionally, fluoropolymers and silicon polymers can be used in combination to obtain modified polystyrene microparticles by blending the fluoropolymer, silicon polymer, polystyrene and additives. The modified polystyrene microparticles can further improve the saturation effect on carbon dioxide. The mass ratio of the fluoropolymer to the silicon polymer is 0.1:1 to 10:1.
[0034] Optionally, the additive is selected from at least one of nucleating agents, antioxidants, UV stabilizers, colorants, or flame retardants. Preferably, the additive is selected from at least one nucleating agent. The nucleating agent is selected from at least one of talc, kaolin, zinc borate, and nano-clay, preferably kaolin and / or zinc borate.
[0035] Optionally, the mass ratio of the polystyrene, the modifier, and the additive is 100:2 to 20:0.1 to 1. Specifically, by controlling the mass ratio of polystyrene to the fluoropolymer and / or silicon-containing polymer to be 100:2 to 100:20, during the blending and granulation of polystyrene, the fluoropolymer and / or silicon-containing polymer, and the additive, the fluoropolymer and / or silicon-containing polymer can be more uniformly distributed in the polystyrene matrix, thereby improving the saturation effect of carbon dioxide in the modified polystyrene particles. Preferably, the mass ratio is 100:5 to 100:10, which can further increase the stability of the modified polystyrene particles for carbon dioxide saturation. Furthermore, by controlling the mass ratio of polystyrene to the additive to be 100:0.1 to 100:1, preferably when the additive is selected as a nucleating agent, and / or when the mass ratio is 100:0.5 to 100:1, the foaming performance of carbon dioxide in polystyrene can be further improved.
[0036] In step S2, during the saturation process of the modified polystyrene microparticles, the pressure of the introduced carbon dioxide is controlled to be 2MPa to 8MPa, preferably 2MPa to 5MPa, which can regulate the saturation effect of carbon dioxide in the modified polystyrene microparticles. Specifically, in the implementation process, the modified polystyrene microparticles can be placed in an autoclave, carbon dioxide can be introduced and saturated for a period of time, preferably 2h to 12h, and more preferably 5h to 8h.
[0037] Optionally, the saturation process can be set as a single stage, where the carbon dioxide pressure and saturation time remain constant. Alternatively, the saturation process can be set as at least two stages, where the carbon dioxide pressure introduced in each stage is different, and the saturation time can be the same or different. For example, the saturation process can be set as a first stage, where the carbon dioxide pressure is 2MPa to 8MPa and remains constant, and the saturation time is 2h to 12h and remains constant. Alternatively, the saturation process can be set as a first stage and a second stage, where the carbon dioxide pressure introduced in the first stage is lower than the carbon dioxide pressure introduced in the second stage. In the first stage, the carbon dioxide pressure is 2MPa to 4MPa, and the saturation time is 1h to 5h; in the second stage, the carbon dioxide pressure is 5MPa to 8MPa, and the saturation time is 1h to 7h. Alternatively, the saturation process can be set as a first stage and a second stage, where the carbon dioxide pressure introduced in the first stage is greater than the carbon dioxide pressure introduced in the second stage. In the first stage, the carbon dioxide pressure is 5MPa to 8MPa, and the saturation time is 1h to 7h; in the second stage... In one stage, the pressure of the introduced carbon dioxide is 2 MPa to 4 MPa, and the saturation time is 1 hour to 3 hours. Alternatively, the saturation process can be divided into three stages: a first stage, a second stage, and a third stage. In the second stage, the pressure of the introduced carbon dioxide is higher than that in the first and third stages. In the first stage, the pressure of the introduced carbon dioxide is 2 MPa to 4 MPa, and the saturation time is 1 hour to 5 hours. In the second stage, the pressure of the introduced carbon dioxide is 5 MPa to 8 MPa, and the saturation time is 1 hour to 7 hours. In the third stage, the pressure of the introduced carbon dioxide is 2 MPa to 4 MPa, and the saturation time is 1 hour to 7 hours. For example, the saturation process can be divided into three stages: a~4MPa, saturation time 1h~5h; or the saturation process can be divided into three stages: a first stage, a second stage, and a third stage, with the carbon dioxide pressure introduced in the second stage being lower than that introduced in the first and third stages. In the first stage, the carbon dioxide pressure introduced is 5MPa~8MPa, and the saturation time is 1h~7h; in the second stage, the carbon dioxide pressure introduced is 2MPa~4MPa, and the saturation time is 1h~5h; in the third stage, the carbon dioxide pressure introduced is 5MPa~8MPa, and the saturation time is 1h~7h.
[0038] Optionally, the saturation process can be carried out at 15℃ to 30℃, thereby allowing for better control of the saturation effect of carbon dioxide in the modified polystyrene microparticles.
[0039] The polystyrene microparticles after the above saturation treatment possess excellent foaming properties. Therefore, in step S3, the saturated polystyrene microparticles are removed from the autoclave, and then the temperature is rapidly increased. This temperature is set 10°C to 20°C above the glass transition temperature of the polystyrene microparticles, causing the polystyrene saturated with carbon dioxide to enter a thermodynamically unstable state. This induces a large number of gas nuclei to form simultaneously within the polystyrene microparticles, resulting in a microporous structure and ultimately forming expanded polystyrene with a high pore density. Specifically, the heating temperature is 90°C to 130°C, and the heating time is 30s to 300s. Preferably, the heating temperature is 100°C to 120°C, and the heating time is 30s to 60s.
[0040] The present invention also provides polystyrene foam beads, which are prepared by the above-described method for preparing polystyrene foam beads.
[0041] Specifically, the polystyrene foam beads have a bulk density of 50 g / L to 170 g / L, a cell diameter of 5 μm to 50 μm, and a cell density of 10. 10 pcs / cm 3 ~10 13 pcs / cm 3 Preferably, the bulk density is 50 g / L to 120 g / L and the pore diameter is 5 μm to 20 μm.
[0042] The present invention also provides a polystyrene foamed bead molded body, which is prepared by the above-mentioned polystyrene foamed beads.
[0043] Specifically, the polystyrene foam can be formed by steam molding of polystyrene foam beads under air pressure, with an air pressure of 0.4MPa to 0.7MPa, an air pressure time of 8h to 24h, a steam molding pressure of 1bar to 1.5bar, and a molding time of 30s to 300s.
[0044] The polystyrene foam molded body produced has a 50% compressive strength of 0.5MPa to 4MPa, which can achieve high compressive and impact resistance, and can be used in fields such as safety protection, thermal insulation packaging, and building materials.
[0045] The following specific embodiments will further illustrate the polystyrene foam beads, their preparation method, and the polystyrene foam molded articles.
[0046] Example 1
[0047] Polystyrene (grade GPPS383), polytetrafluoroethylene and kaolin in a mass ratio of 100:10:1 were mixed and melted in an extruder at 200°C and then extruded and granulated to obtain modified polystyrene microparticles.
[0048] Modified polystyrene microparticles were placed in an autoclave, and carbon dioxide at 3 MPa was introduced. After saturation for 6 hours, the autoclave was removed, and the temperature was rapidly increased to 110°C. Polystyrene foam beads were obtained by heating at 110°C for 60 seconds.
[0049] The electron microscope image of the polystyrene foam beads in this embodiment is as follows: Figure 1 As shown, by Figure 1 It can be seen that the polystyrene foam beads have uniform pores and high pore density. Specifically, the polystyrene foam beads obtained in this embodiment have a bulk density of 90 g / L, a pore diameter of 5 μm, and a pore density of 4.1 × 10⁻⁶. 12 pcs / cm 3 .
[0050] The polystyrene foam beads obtained in this embodiment were subjected to an air pressure of 0.5 MPa for 12 hours and then molded with water vapor at 1.3 bar to obtain a polystyrene foam molded body with a 50% compressive strength of 1.35 MPa.
[0051] Example 2
[0052] Polystyrene (grade GPPS383), polycarbosilane, and zinc borate in a mass ratio of 100:5:0.5 were mixed and melted in an extruder at 190°C and then extruded and granulated to obtain modified polystyrene microparticles.
[0053] Modified polystyrene microparticles were placed in an autoclave, and carbon dioxide was introduced at 5 MPa. After saturation for 6 hours, the autoclave was removed, and the temperature was rapidly increased to 110°C. Polystyrene foam beads were obtained by heating at 110°C for 60 seconds.
[0054] The polystyrene foam beads obtained in this embodiment have a bulk density of 60 g / L, a cell diameter of 20 μm, and a cell density of 6.1 × 10⁻⁶. 10 pcs / cm 3 .
[0055] The polystyrene foam beads obtained in this embodiment were subjected to an air pressure of 0.5 MPa for 12 hours and then molded with water vapor at 1.2 bar to obtain a polystyrene foam molded body with a 50% compressive strength of 0.60 MPa.
[0056] Example 3
[0057] Polystyrene (grade GPPS123), polyvinylidene fluoride, and zinc borate in a mass ratio of 100:5:0.5 were mixed and melted in an extruder at 195°C and then extruded and granulated to obtain modified polystyrene microparticles.
[0058] Modified polystyrene microparticles were placed in an autoclave, and carbon dioxide was introduced at 2 MPa. After saturation for 6 hours, the autoclave was removed, and the temperature was rapidly increased to 110°C. Polystyrene foam beads were obtained by heating at 110°C for 30 seconds.
[0059] The polystyrene foam beads obtained in this embodiment have a bulk density of 120 g / L, a cell diameter of 10 μm, and a cell density of 3.6 × 10⁻⁶. 11 pcs / cm 3 .
[0060] The polystyrene foam beads obtained in this embodiment were subjected to an air pressure of 0.5 MPa for 12 hours and then molded with water vapor at 1.2 bar to obtain a polystyrene foam molded body with a 50% compressive strength of 2.12 MPa.
[0061] Example 4
[0062] Polystyrene (grade GPPS123), polycarbosilane, and kaolin in a mass ratio of 100:5:0.5 were mixed and melted in an extruder at 185°C and then extruded and granulated to obtain modified polystyrene microparticles.
[0063] Modified polystyrene microparticles were placed in an autoclave, and carbon dioxide was introduced at 8 MPa. After saturation for 6 hours, the microparticles were removed, and the temperature was rapidly increased to 100°C. The microparticles were heated at 100°C for 30 seconds to obtain polystyrene foam beads.
[0064] The polystyrene foam beads obtained in this embodiment have a bulk density of 60 g / L, a cell diameter of 15 μm, and a cell density of 6.3 × 10⁻⁶. 10 pcs / cm 3 .
[0065] The polystyrene foam beads obtained in this embodiment were subjected to an air pressure of 0.5 MPa for 12 hours and then molded with water vapor at 1.0 bar to obtain a polystyrene foam molded body with a 50% compressive strength of 0.63 MPa.
[0066] Example 5
[0067] Polystyrene (grade GPPS383), polytetrafluoroethylene and kaolin in a mass ratio of 100:10:1 were mixed and melted in an extruder at 200°C and then extruded and granulated to obtain modified polystyrene microparticles.
[0068] Modified polystyrene microparticles were placed in an autoclave, and carbon dioxide at 3 MPa was introduced. After saturation for 2 hours, the saturation pressure was increased to 5 MPa, and saturation was continued for another 3 hours. The microparticles were then removed, and the temperature was rapidly increased to 110°C. The microparticles were heated at 110°C for 60 seconds to obtain polystyrene foam beads.
[0069] The polystyrene foam beads obtained in this embodiment have a bulk density of 85 g / L, a cell diameter of 5 μm, and a cell density of 3.7 × 10⁻⁶. 11 pcs / cm 3 .
[0070] The polystyrene foam beads obtained in this embodiment were subjected to an air pressure of 0.5 MPa for 12 hours and then molded with water vapor at 1.3 bar to obtain a polystyrene foam molded body with a 50% compressive strength of 1.23 MPa.
[0071] Example 6
[0072] Polystyrene (grade GPPS383), polycarbosilane, and zinc borate in a mass ratio of 100:5:0.5 were mixed and melted in an extruder at 190°C and then extruded and granulated to obtain modified polystyrene microparticles.
[0073] Modified polystyrene microparticles were placed in an autoclave, and carbon dioxide was introduced at 6 MPa. After saturation for 3 hours, the pressure inside the autoclave was slowly reduced to 3 MPa. After saturation for another hour, the microparticles were removed and the temperature was rapidly increased to 110°C. The microparticles were heated at 110°C for 60 seconds to obtain polystyrene foam beads.
[0074] The polystyrene foam beads obtained in this embodiment have a bulk density of 70 g / L, a cell diameter of 15 μm, and a cell density of 8.9 × 10⁻⁶. 11 pcs / cm 3 .
[0075] The polystyrene foam beads obtained in this embodiment were subjected to an air pressure of 0.5 MPa for 12 hours and then molded with water vapor at 1.2 bar to obtain a polystyrene foam molded body with a 50% compressive strength of 0.95 MPa.
[0076] Comparative Example 1
[0077] Polystyrene (grade GPPS383) and kaolin were mixed and melted in a mass ratio of 100:1 using an extruder at 200°C and then extruded and granulated to obtain modified polystyrene microparticles.
[0078] Modified polystyrene microparticles were placed in an autoclave, and carbon dioxide was introduced at 3 MPa. After saturation for 6 hours, the microparticles were removed, and the temperature was rapidly increased to 110°C. The microparticles were heated at 110°C for 60 seconds to obtain polystyrene foam beads.
[0079] The electron microscope image of the polystyrene foam beads obtained in this comparative example is shown below. Figure 2 As shown, by Figure 2 It can be seen that the pores of polystyrene foam beads are not uniform.
[0080] The polystyrene foam beads obtained in this comparative example were steam molded to produce a polystyrene foam molded body. The shrinkage during the molding process was severe, and a complete molded body could not be obtained.
[0081] Comparative Example 2
[0082] The only difference between Comparative Example 2 and Example 1 is that the modified polystyrene microparticles were placed in an autoclave, carbon dioxide at 10 MPa was introduced, and after saturation for 6 hours, they were taken out and then the temperature was rapidly increased to 110°C. Polystyrene foam beads were obtained by heating at 110°C for 60 seconds.
[0083] The polystyrene foam beads obtained in this comparative example have a bulk density of 60 g / L, a cell diameter of 70 μm, and a cell density of 2.7 × 10⁻⁶. 9 pcs / cm 3 .
[0084] The polystyrene foam beads obtained in this comparative example were subjected to an air pressure of 0.5 MPa for 12 hours and then molded with water vapor at 1.3 bar to obtain a polystyrene foam molded body with a 50% compressive strength of 0.5 MPa.
[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0086] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.
Claims
1. A method for preparing polystyrene foam beads, characterized in that, Includes the following steps: Polystyrene, a modifier, and an additive are mixed and granulated to obtain modified polystyrene microparticles. The modifier is selected from fluoropolymers and / or silicon-containing polymers. The mass ratio of polystyrene to the fluoropolymer and / or the silicon-containing polymer is 100:5 to 100:
10. The fluoropolymer is selected from at least one of polytetrafluoroethylene, polytrifluoroethylene, ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride, or polyvinylidene fluoride. The silicon-containing polymer is selected from at least one of polysiloxane, polycarbosilane, or polynitrosilane. The additive is selected from at least one of nucleating agents, antioxidants, UV stabilizers, colorants, or flame retardants. The modified polystyrene microparticles are saturated to obtain saturated microparticles, wherein carbon dioxide at a pressure of 2 MPa to 8 MPa is introduced during the saturation process; The saturated microparticles are heated to obtain polystyrene foam beads. The bulk density of the polystyrene foam beads is 50 g / L to 120 g / L, the cell diameter is 5 μm to 20 μm, and the cell density is 10. 10 pcs / cm 3 ~10 13 pcs / cm 3 .
2. The method for preparing polystyrene foam beads according to claim 1, characterized in that, The saturation process takes 2 to 12 hours.
3. The method for preparing polystyrene foam beads according to claim 1, characterized in that, In the step of heating the saturated particles, the heating temperature is 90℃~130℃ and the heating time is 30s~300s.
4. The method for preparing polystyrene foam beads according to claim 1, characterized in that, The mass ratio of the polystyrene to the additive is 100:0.5 to 100:
1.
5. The method for preparing polystyrene foam beads according to claim 1, characterized in that, The weight-average molecular weight of the polystyrene is 150,000 to 300,000.
6. The method for preparing polystyrene foam beads according to claim 1, characterized in that, The nucleating agent is selected from at least one of talc, kaolin, zinc borate, and nano clay.
7. A polystyrene foamed bead obtained by the preparation method of polystyrene foamed beads according to any one of claims 1 to 6.
8. A polystyrene foamed molded body prepared using the polystyrene foamed beads according to claim 7.