A production process for flame-retardant polystyrene foam board

Abstract

The present invention relates to the technical field of building thermal insulation materials, specifically to a production process for a flame-retardant polystyrene foam board, comprising the following components in parts by weight: 100 parts of polystyrene particles, 8-12 parts of hydroxy polydimethylsiloxane, 5-15 parts of a foaming agent, 0.5-2 parts of a cross-linking agent, 3-8 parts of flame-retardant particles, and 2-5 parts of a plasticizer. In the present invention, by further processing the polystyrene foam board by puncturing and soaking it three times, a firm adhesion layer is formed on the surface of the foam board, and a multi-layer cooperative structure is constructed inside. In terms of thermal insulation, a dense interface layer suppresses air convection, and a flame retardant and perfluorohexanone fill the pores, effectively reducing thermal conductivity and enhancing thermal insulation effects. In terms of flame retardancy, a silane coupling agent firmly locks perfluorohexanone, ensuring that sufficient flame-retardant gas is released during combustion. The heat-insulating carbon layer formed in conjunction with the flame retardant achieves a synergistic effect of gas-phase flame retardancy and condensed phase barrier, thereby greatly improving flame retardancy.

Description

Technical Field

[0001] The invention relates to the technical field of building thermal insulation materials, in particular to a production process of a flame-retardant polystyrene foam board. Background Art

[0002] Styrene foam board, also known as polystyrene foam board or extruded polystyrene board, is a lightweight, porous insulation material with a closed honeycomb structure inside. It has excellent thermal insulation, moisture resistance, sound insulation and pressure resistance. At the same time, it has low density and is easy to construct. It is widely used in building wall insulation, roof insulation, cold storage projects and packaging cushioning.

[0003] In the prior art, since the polystyrene in the polystyrene foam board is a hydrocarbon, it is easy to melt, drip and burn when exposed to fire, and a large amount of toxic smoke with heat is released during the combustion process. Therefore, flame retardant components are added during the preparation process to improve the flame retardant properties of the foam board. However, when adding flame retardant components, the existing polystyrene foam board is simply a mixture of multiple raw materials, and can only use the flame retardant properties of the flame retardant for passive flame retardancy, and cannot form an effective heat-insulating flame retardant barrier at high temperatures. The flame retardant performance needs to be further improved.

[0004] So we proposed a production process of flame retardant polystyrene foam board to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a production process of a flame retardant polystyrene foam board to solve the problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a production process of a flame-retardant polystyrene foam board, comprising the following components in parts by weight: 100 parts of polystyrene particles, 8-12 parts of hydroxy polydimethylsiloxane, 5-15 parts of a foaming agent, 0.5-2 parts of a cross-linking agent, 3-8 parts of flame-retardant particles, and 2-5 parts of a plasticizer.

[0007] Preferably, the foaming agent is any one of pentane, butane or cyclohexane.

[0008] Preferably, the cross-linking agent is any one of sulfur or sodium sulfide.

[0009] Preferably, the plasticizer is dioctyl phthalate.

[0010] Preferably, the method for treating hydroxy polydimethylsiloxane comprises the following steps: weighing hydroxy polydimethylsiloxane and a crosslinking agent as needed and adding them to a stirring kettle, reacting them at a temperature of 80-100° C. and a stirring speed of 300-500 rpm for 1-2 hours, and then performing a sulfur crosslinking treatment to obtain an elastic prepolymer.

[0011] Preferably, the method for preparing the flame retardant particles comprises the following steps:

[0012] Step 1: Dissolve ferrous chloride and ferric chloride in deionized water in a molar ratio of 1:2, heat to 70-90°C, add ammonia water to adjust the pH to 10, stir at 50-100 rpm for 30-40 minutes, transfer to a centrifuge, and centrifuge at 5000-8000 rpm for 10-15 minutes. Wash the first precipitate with water and dry it to obtain the ferrosoferric oxide core;

[0013] Step 2: Disperse the ferroferric oxide core in methanol, add 2-methylimidazole and zinc nitrate, stir at 30-50 rpm for 10-12 hours at room temperature, centrifuge at 3000-5000 rpm for 15-20 minutes, and then dry the second precipitate to obtain core-shell particles;

[0014] Step 3: Place the core-shell particles in a glass container, add perfluorohexanone and soak for 2-4 hours, then filter to obtain a filter residue, and drain the filter residue to obtain flame-retardant particles.

[0015] Preferably, in step 1, the amount of deionized water is 20-30 times the total mass of ferrous chloride and ferric chloride; in step 2, the mass ratio of ferrosoferric oxide core to methanol is 1:(20-30), the mass ratio of ferrosoferric oxide core, 2-methylimidazole and zinc nitrate is 1:(5-10):(3-6); and in step 3, the volume ratio of core-shell particles to perfluorohexanone is 1:3.

[0016] Preferably, a production process of a flame retardant polystyrene foam board comprises the following steps:

[0017] S1. Weigh polystyrene particles, elastic prepolymer, plasticizer, and flame retardant particles as needed and add them to a high-speed blender. Stir at 800-1200 rpm for 10-20 minutes to obtain a mixture.

[0018] S2, the mixture is put into the extruder, the extruder is set to 180-200 ° C in the heating section, 200-230 ° C in the melting section, 220-250 ° C in the homogenizing section, and the screw speed is 100-200 rpm. After the mixture is melted, it is injected into the mold, and the foaming agent is introduced at a pressure of 0.3-0.6 MPa. The mold temperature is controlled at 40-60 ° C. After cooling and molding, a flame retardant polystyrene foam board is obtained;

[0019] S3: flame retardant polystyrene foam board is further processed.

[0020] Preferably, the further processing method of the flame retardant polystyrene foam board comprises the following steps:

[0021] Step 1: Preparation: Punch holes on the surface of a flame-retardant polystyrene foam board with a hole diameter of 0.5-1 mm and a hole spacing of 5-10 mm to obtain a first foam board, which is set aside. Weigh KH-560, ethanol, and deionized water in a mass ratio of 1:15:5 to prepare a silane coupling agent solvent, which is set aside. Weigh a liquid flame retardant liquid prepared by mixing magnesium hydroxide and ethanol in a mass ratio of 1:9 to prepare a liquid flame retardant liquid, which is set aside.

[0022] Step 2: Coupling agent treatment: immersing the first foam board in a silane coupling agent solvent, soaking for 15-20 minutes at room temperature, and then draining to obtain a second foam board;

[0023] Step 3: Loading with flame retardant liquid: immerse the second foam board in liquid flame retardant liquid, soak at room temperature for 10-15 minutes, drain, and let stand for 1-2 hours to obtain a third foam board;

[0024] Step 4: perfluorohexanone loading, immerse the third foam board in liquid perfluorohexanone at 20-25°C for 30-60 minutes, then take out the third foam board and transfer it to a drying oven, set the temperature at 25-30°C, and dry it for 4-6 hours to complete the further treatment of the flame retardant polystyrene foam board.

[0025] Preferably, the volume ratio of the first foam board to the silane coupling agent solvent is 1: (3-5), the volume ratio of the second foam board to the liquid flame retardant liquid is 1: (3-5), and the volume ratio of the third foam board to the liquid perfluorohexanone is 1: (3-5).

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. In the present invention, a strong adhesion layer is formed on the surface of the polystyrene foam board by further processing of punching holes and soaking three times, and a multi-layer cooperative structure is constructed inside. In terms of thermal insulation, the dense interface layer suppresses air convection, and the flame retardant and perfluorohexanone fill the pores, effectively reducing the thermal conductivity and enhancing the thermal insulation effect. In terms of flame retardancy, the silane coupling agent firmly locks the perfluorohexanone to ensure sufficient release of flame-flaming gas during combustion. The thermal insulation carbon layer formed by the flame retardant realizes the synergistic effect of gas phase flame retardancy and condensed phase barrier, greatly improving the flame retardant performance. This process achieves a double breakthrough in thermal insulation and flame retardancy, providing a safer and more efficient solution for building insulation materials.

[0028] 2. In the present invention, flame-retardant particles are introduced. The unique core-shell structure of the flame-retardant particles achieves the dual effects of heat insulation and flame retardancy. During combustion, the inner core promotes the decomposition of the outer layer material, releasing perfluorohexanone that quickly vaporizes, suppressing the fire by absorbing heat and cooling, and isolating oxygen. The zinc oxide nanoparticles generated by the decomposition of the outer shell form a carbon layer, which blocks heat and combustible gases, effectively ensuring the fire safety of the building. At the same time, the nano-scale flame-retardant particles are evenly dispersed inside the foam board, reducing the heat transfer path, which can enhance the thermal insulation effect, meet the demand of building exterior walls for high-efficiency and energy-saving insulation materials, and provide the construction industry with high-quality insulation materials that are both safe and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a preparation flow chart of a production process of a flame retardant polystyrene foam board of the present invention;

[0030] Figure 2 This is a flow chart of further processing of the flame retardant polystyrene foam board of the present invention DETAILED DESCRIPTION

[0031] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1. This example provides a production process for a flame-retardant polystyrene foam board, comprising the following components in parts by weight: 100 parts of polystyrene particles, 8 parts of hydroxy polydimethylsiloxane, 5 parts of a foaming agent, 0.5 parts of a cross-linking agent, 3 parts of flame-retardant particles, and 2 parts of a plasticizer.

[0033] Among them, pentane is selected as the foaming agent.

[0034] Among them, sulfur is selected as the cross-linking agent.

[0035] Wherein, the plasticizer is dioctyl phthalate.

[0036] The treatment method of hydroxy polydimethylsiloxane includes the following steps: weighing hydroxy polydimethylsiloxane and a crosslinking agent as needed and adding them into a stirring kettle, reacting them at a temperature of 80° C. and a stirring speed of 300 rpm for 1 hour, and then performing sulfur crosslinking treatment to obtain an elastic prepolymer.

[0037] The method for preparing the flame retardant particles comprises the following steps:

[0038] Step 1: Dissolve ferrous chloride and ferric chloride in deionized water at a molar ratio of 1:2, heat to 70°C, add ammonia water to adjust the pH to 10, stir at 50 rpm for 30 minutes, transfer to a centrifuge, and centrifuge at 5000 rpm for 10 minutes. Take the first precipitate, wash with water, and dry to obtain the ferroferric oxide core;

[0039] Step 2: Disperse the ferroferric oxide core in methanol, add 2-methylimidazole and zinc nitrate, stir at 30 rpm for 10 h at room temperature, centrifuge at 3000 rpm for 15 min, and then dry the second precipitate to obtain core-shell particles;

[0040] Step 3: Place the core-shell particles in a glass container, add perfluorohexanone and soak for 2 hours, then filter to obtain a filter residue, and drain the filter residue to obtain flame-retardant particles.

[0041] Among them, in step 1, the deionized water is 20 times the total mass of ferrous chloride and ferric chloride, in step 2, the mass ratio of ferroferric oxide core to methanol is 1:20, the mass ratio of ferroferric oxide core, 2-methylimidazole and zinc nitrate is 1:5:3, and in step 3, the volume ratio of core-shell particles and perfluorohexanone is 1:3.

[0042] Among them, a production process of a flame retardant polystyrene foam board includes the following steps:

[0043] S1. Weigh polystyrene particles, elastic prepolymer, plasticizer, and flame retardant particles as needed, add them to a high-speed blender, and stir at 800 rpm for 10 min to obtain a mixture;

[0044] S2, the mixture was put into the extruder, and the extruder was set to 180 ° C in the heating section, 200 ° C in the melting section, 220 ° C in the homogenizing section, and 100 rpm in the screw speed. After the mixture was melted, it was injected into the mold, and the foaming agent was introduced at a pressure of 0.3 MPa. The mold temperature was controlled at 40 ° C, and the flame retardant polystyrene foam board was obtained after cooling and molding;

[0045] S3: flame retardant polystyrene foam board is further processed.

[0046] The further processing method of the flame retardant polystyrene foam board comprises the following steps:

[0047] Step 1: Preparation: Punch holes on the surface of a flame-retardant polystyrene foam board with a hole diameter of 0.5 mm and a hole spacing of 5 mm to obtain a first foam board, which is set aside. Weigh KH-560, ethanol, and deionized water in a mass ratio of 1:15:5 to prepare a silane coupling agent solvent, which is set aside. Weigh a liquid flame retardant liquid prepared by mixing magnesium hydroxide and ethanol in a mass ratio of 1:9 to prepare a liquid flame retardant liquid, which is set aside.

[0048] Step 2: Coupling agent treatment: immersing the first foam board in a silane coupling agent solvent, soaking for 15 minutes at room temperature, and then draining to obtain a second foam board;

[0049] Step 3: Loading with flame retardant liquid: immerse the second foam board in liquid flame retardant liquid, soak at room temperature for 10 minutes, drain, and let stand for 1 hour to obtain a third foam board;

[0050] Step 4: perfluorohexanone loading, immerse the third foam board in liquid perfluorohexanone at 20°C for 30 minutes, then take out the third foam board and transfer it to a drying oven, set the temperature to 25°C, and dry it for 4 hours to complete the further treatment of the flame retardant polystyrene foam board.

[0051] Among them, the volume ratio of the first foam board to the silane coupling agent solvent is 1:3, the volume ratio of the second foam board to the liquid flame retardant liquid is 1:3, and the volume ratio of the third foam board to the liquid perfluorohexanone is 1:3.

[0052] Example 2, a production process for a flame-retardant polystyrene foam board, comprising the following components in parts by weight: 100 parts of polystyrene particles, 10 parts of hydroxy polydimethylsiloxane, 10 parts of a foaming agent, 1 part of a cross-linking agent, 5 parts of flame-retardant particles, and 4 parts of a plasticizer.

[0053] Among them, butane is selected as the foaming agent.

[0054] Among them, sulfur is selected as the cross-linking agent.

[0055] Wherein, the plasticizer is dioctyl phthalate.

[0056] Among them, the treatment method of hydroxy polydimethylsiloxane includes the following steps: weighing hydroxy polydimethylsiloxane and a cross-linking agent as needed and adding them to a stirring kettle, reacting them at a temperature of 90°C and a stirring speed of 400 rpm for 1.5 hours, and then performing sulfur cross-linking treatment to obtain an elastic prepolymer.

[0057] The method for preparing the flame retardant particles comprises the following steps:

[0058] Step 1: Dissolve ferrous chloride and ferric chloride in deionized water at a molar ratio of 1:2, heat to 80°C, add ammonia water to adjust the pH to 10, stir at 80 rpm for 35 minutes, transfer to a centrifuge, and centrifuge at 6500 rpm for 12 minutes. Take the first precipitate, wash with water, and dry to obtain the ferroferric oxide core;

[0059] Step 2: Disperse the ferrosoferric oxide core in methanol, add 2-methylimidazole and zinc nitrate, stir at 40 rpm for 11 h at room temperature, centrifuge at 4000 rpm for 18 min, and then dry the second precipitate to obtain core-shell particles;

[0060] Step 3: Place the core-shell particles in a glass container, add perfluorohexanone and soak for 3 hours, then filter to obtain a filter residue, and drain the filter residue to obtain flame-retardant particles.

[0061] Among them, in step 1, the deionized water is 25 times the total mass of ferrous chloride and ferric chloride, in step 2, the mass ratio of ferroferric oxide core to methanol is 1:25, the mass ratio of ferroferric oxide core, 2-methylimidazole and zinc nitrate is 1:8:5, and in step 3, the volume ratio of core-shell particles and perfluorohexanone is 1:3.

[0062] Among them, a production process of a flame retardant polystyrene foam board includes the following steps:

[0063] S1. Weigh polystyrene particles, elastic prepolymer, plasticizer, and flame retardant particles as needed, add them to a high-speed blender, and stir at 1000 rpm for 150 min to obtain a mixture;

[0064] S2, the mixture was put into the extruder, and the extruder was set to a heating section of 190°C, a melting section of 215°C, a homogenizing section of 235°C, and a screw speed of 150 rpm. After the mixture was melted, it was injected into the mold, and a foaming agent was introduced at a pressure of 0.4 MPa. The mold temperature was controlled at 50°C, and the flame retardant polystyrene foam board was obtained after cooling and molding;

[0065] S3: flame retardant polystyrene foam board is further processed.

[0066] The further processing method of the flame retardant polystyrene foam board comprises the following steps:

[0067] Step 1: Preparation: Punch holes on the surface of a flame-retardant polystyrene foam board with a hole diameter of 0.8 mm and a hole spacing of 5-10 mm to obtain a first foam board, which is set aside. Weigh KH-560, ethanol, and deionized water in a mass ratio of 1:15:5 to prepare a silane coupling agent solvent, which is set aside. Weigh a liquid flame retardant liquid prepared by mixing magnesium hydroxide and ethanol in a mass ratio of 1:9 to prepare a liquid flame retardant liquid, which is set aside.

[0068] Step 2: Coupling agent treatment: immersing the first foam board in a silane coupling agent solvent, soaking for 18 minutes at room temperature, and then draining to obtain a second foam board;

[0069] Step 3: Loading with flame retardant liquid: immerse the second foam board in liquid flame retardant liquid, soak at room temperature for 12 minutes, drain, and let stand for 1.5 hours to obtain a third foam board;

[0070] Step 4: perfluorohexanone loading, immerse the third foam board in liquid perfluorohexanone at 22°C for 45 minutes, then take out the third foam board and transfer it to a drying oven, set the temperature to 280°C, and dry it for 5 hours to complete the further treatment of the flame retardant polystyrene foam board.

[0071] Among them, the volume ratio of the first foam board to the silane coupling agent solvent is 1:4, the volume ratio of the second foam board to the liquid flame retardant liquid is 1:4, and the volume ratio of the third foam board to the liquid perfluorohexanone is 1:4.

[0072] Example 3, a production process for a flame retardant polystyrene foam board, comprising the following components in parts by weight: 100 parts of polystyrene particles, 12 parts of hydroxy polydimethylsiloxane, 15 parts of a foaming agent, 2 parts of a cross-linking agent, 8 parts of flame retardant particles, and 5 parts of a plasticizer.

[0073] Among them, cyclohexane is selected as the foaming agent.

[0074] Among them, sodium sulfide is selected as the cross-linking agent.

[0075] Wherein, the plasticizer is dioctyl phthalate.

[0076] Among them, the treatment method of hydroxy polydimethylsiloxane includes the following steps: weighing hydroxy polydimethylsiloxane and a cross-linking agent as needed and adding them to a stirring kettle, reacting at a temperature of 100°C and a stirring speed of 500 rpm for 2 hours, and then performing sulfur cross-linking treatment to obtain an elastic prepolymer.

[0077] The method for preparing the flame retardant particles comprises the following steps:

[0078] Step 1: Dissolve ferrous chloride and ferric chloride in deionized water at a molar ratio of 1:2, heat to 90°C, add ammonia water to adjust the pH to 10, stir at 100 rpm for 40 minutes, transfer to a centrifuge, and centrifuge at 8000 rpm for 15 minutes. Take the first precipitate, wash with water, and dry to obtain the ferroferric oxide core;

[0079] Step 2: Disperse the ferrosoferric oxide core in methanol, add 2-methylimidazole and zinc nitrate, stir at 50 rpm for 12 h at room temperature, centrifuge at 5000 rpm for 20 min, and then dry the second precipitate to obtain core-shell particles;

[0080] Step 3: Place the core-shell particles in a glass container, add perfluorohexanone and soak for 4 hours, then filter to obtain a filter residue, and drain the filter residue to obtain flame-retardant particles.

[0081] Among them, in step 1, the deionized water is 30 times the total mass of ferrous chloride and ferric chloride, in step 2, the mass ratio of ferroferric oxide core to methanol is 1:30, the mass ratio of ferroferric oxide core, 2-methylimidazole and zinc nitrate is 1:10:6, and in step 3, the volume ratio of core-shell particles and perfluorohexanone is 1:3.

[0082] Among them, a production process of a flame retardant polystyrene foam board includes the following steps:

[0083] S1. Weigh polystyrene particles, elastic prepolymer, plasticizer, and flame retardant particles as needed, add them to a high-speed blender, and stir at 1200 rpm for 20 min to obtain a mixture;

[0084] S2, the mixture was put into the extruder, the extruder was set to 200 ° C in the heating section, 230 ° C in the melting section, 250 ° C in the homogenizing section, and 200 rpm in the screw speed. After the mixture was melted, it was injected into the mold, and the foaming agent was introduced at a pressure of 0.6 MPa. The mold temperature was controlled at 60 ° C, and the flame retardant polystyrene foam board was obtained after cooling and molding;

[0085] S3: flame retardant polystyrene foam board is further processed.

[0086] The further processing method of the flame retardant polystyrene foam board comprises the following steps:

[0087] Step 1: Preparation: Punch holes on the surface of a flame-retardant polystyrene foam board with a hole diameter of 1 mm and a hole spacing of 10 mm to obtain a first foam board, which is set aside. Weigh KH-560, ethanol, and deionized water in a mass ratio of 1:15:5 to prepare a silane coupling agent solvent, which is set aside. Weigh a liquid flame retardant liquid prepared by mixing magnesium hydroxide and ethanol in a mass ratio of 1:9 to prepare a liquid flame retardant liquid, which is set aside.

[0088] Step 2: Coupling agent treatment: immersing the first foam board in a silane coupling agent solvent, soaking for 20 minutes at room temperature, and then draining to obtain a second foam board;

[0089] Step 3: Loading with flame retardant liquid: immerse the second foam board in liquid flame retardant liquid, soak at room temperature for 15 minutes, drain, and let stand for 2 hours to obtain a third foam board;

[0090] Step 4: perfluorohexanone loading, immerse the third foam board in liquid perfluorohexanone at 25°C for 60 minutes, then take out the third foam board and transfer it to a drying oven, set the temperature to 30°C, and dry it for 6 hours to complete the further treatment of the flame retardant polystyrene foam board.

[0091] Among them, the volume ratio of the first foam board to the silane coupling agent solvent is 1:5, the volume ratio of the second foam board to the liquid flame retardant liquid is 1:5, and the volume ratio of the third foam board to the liquid perfluorohexanone is 1:5.

[0092] Comparative Example 1: The difference between this comparative example and Examples 1-3 is that the flame-retardant polystyrene foam board of this comparative example is not subjected to further treatment in the production process.

[0093] Comparative Example 2: The difference between this comparative example and Examples 1-3 is that no flame retardant particles are added in the production process of the flame retardant polystyrene foam board of this comparative example.

[0094] Comparative Example 3: The difference between this comparative example and Examples 1-3 is that: in the production process of the flame-retardant polystyrene foam board of this comparative example, no flame-retardant particles are added and the foam board is not further processed.

[0095] Thermal insulation performance test: According to GB / T10294-2008 standard, the thermal conductivity coefficient (unit: W / (m K), the lower the value, the stronger the thermal insulation;

[0096] Flame retardant performance test: According to the GB / T2408-2021 vertical combustion method, the combustion grade (UL94) and oxygen index (LOI, unit: %) are determined. The higher the grade and the larger the LOI value, the stronger the flame retardancy.

[0097] Performance test: The epoxy resin composite materials prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests, and the test data obtained are recorded in the following table:

[0098]

[0099] By analyzing the data in the comparison table, it can be seen that the thermal insulation performance and flame retardant performance of Comparative Example 1 and Comparative Example 3, which lack the further processing process of the foam board, are greatly reduced compared with Examples 1-3. It can be seen that during the further processing of the foam board, when the foam board is soaked for the first time after puncturing the foam board, the coupling agent molecules penetrate and diffuse through the capillary action of the foam board surface and the holes, and the organic group at one end thereof produces physical entanglement or weak chemical action with the polystyrene molecular chain on the surface of the foam board, and the siloxy group at the other end is hydrolyzed to form a silanol group, preparing for subsequent combination with other substances. After draining, the silane coupling agent is fully cured on the surface and in the holes of the foam board to form a firm adhesion layer, which enhances the bonding force between the subsequent substances and the foam board. With the second soaking treatment, the flame retardant particles are adsorbed on the foam surface and in the holes through the coupling agent layer. After draining, the ethanol evaporates and the flame retardant is solidified and adhered. During the third soaking treatment, perfluorohexanone fills the holes and flame retardant gaps through capillary action and coupling agent adsorption. With further drying, the ethanol substance Volatile, while perfluoroacetone will remain in a crystalline state and stably exist in the foam structure due to low temperatures, which makes the foam board form a reinforced structure of "surface anchoring-internal filling-multi-layer synergy". From the perspective of thermal insulation performance, the dense interface layer formed by the curing of the coupling agent effectively inhibits air convection and reduces the heat transfer channel, while the flame retardant particles and perfluorohexanone fill the pores, further hindering heat conduction and heat radiation, and reducing the thermal conductivity. In terms of flame retardant performance, the adhesion layer formed by the silane coupling agent firmly locks perfluorohexanone to prevent its volatilization and loss during storage, ensuring that sufficient inert gas can be released during combustion to dilute the oxygen concentration. At the same time, the flame retardant particles react rapidly at high temperatures to form an insulating carbon layer, which synergizes with the gas phase flame retardant effect of perfluorohexanone to significantly increase the flame retardant performance. This process not only significantly improves the functionality of the foam board, but also achieves a dual breakthrough in thermal insulation and flame retardant properties through molecular-level interface modification and material composite, greatly improving the thermal insulation and flame retardant properties of traditional polystyrene foam boards and ensuring building safety.

[0100] Secondly, by analyzing the data in the comparison table, it can be seen that the thermal insulation performance and flame retardant performance of Comparative Examples 2 and 3, which lack flame retardant particles, are significantly reduced compared with Examples 1-3. It can be seen that flame retardant particles play a core role in improving the performance of the foam board. This is because, during the preparation process, the flame retardant particles are composed of a ferroferric oxide core and a porous frame material shell loaded with perfluorohexanone. The ferroferric oxide core can promote the decomposition of the outer porous frame material in the early stage of combustion of the foam board, thereby promoting the rapid release of the loaded perfluorohexanone. Perfluorohexanone has a low boiling point and is rapidly vaporized when heated. On the one hand, it reduces the ambient temperature by absorbing a large amount of heat. On the other hand, the released gas can isolate oxygen and interrupt the combustion chain reaction. At the same time, the zinc oxide nanoparticles produced by the decomposition of the porous frame material shell can catalyze the formation of a dense carbon layer on the surface of the material, like a solid protective shield, effectively blocking heat transfer and combustible gas escape, thereby improving the flame retardant properties of the foam board. At the same time, the flame retardant particles are dispersed inside the foam board, which can effectively reduce heat transfer, thereby reducing the thermal conductivity of the material, thereby improving the thermal insulation performance of the foam board.

[0101] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0102] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A production process for flame retardant polystyrene foam board, characterized in that: The invention comprises the following components in parts by weight: 100 parts of polystyrene particles, 8-12 parts of hydroxy polydimethylsiloxane, 5-15 parts of foaming agent, 0.5-2 parts of cross-linking agent, 3-8 parts of flame retardant particles, and 2-5 parts of plasticizer; The method for preparing the flame retardant particles comprises the following steps: Step 1: Dissolve ferrous chloride and ferric chloride in deionized water in a molar ratio of 1:2, heat to 70-90°C, add ammonia water to adjust the pH to 10, stir at 50-100 rpm for 30-40 minutes, transfer to a centrifuge, and centrifuge at 5000-8000 rpm for 10-15 minutes. Wash the first precipitate with water and dry it to obtain the ferrosoferric oxide core; Step 2: Disperse the ferroferric oxide core in methanol, add 2-methylimidazole and zinc nitrate, stir at 30-50 rpm for 10-12 hours at room temperature, centrifuge at 3000-5000 rpm for 15-20 minutes, and then dry the second precipitate to obtain core-shell particles; Step 3: placing the core-shell particles in a glass container, adding perfluorohexanone and soaking for 2-4 hours, filtering to obtain a filter residue, and draining the filter residue to obtain flame-retardant particles; The method for treating hydroxy polydimethylsiloxane comprises the following steps: weighing hydroxy polydimethylsiloxane and a crosslinking agent as needed, adding them into a stirring kettle, reacting them at a temperature of 80-100° C. and a stirring speed of 300-500 rpm for 1-2 hours, and then performing a sulfur crosslinking treatment to obtain an elastic prepolymer; The production process of flame retardant polystyrene foam board comprises the following steps: S1. Weigh polystyrene particles, elastic prepolymer, plasticizer, and flame retardant particles as needed and add them to a high-speed blender. Stir at 800-1200 rpm for 10-20 minutes to obtain a mixture. S2, the mixture is put into the extruder, the extruder is set to 180-200 ° C in the heating section, 200-230 ° C in the melting section, 220-250 ° C in the homogenizing section, and the screw speed is 100-200 rpm. After the mixture is melted, it is injected into the mold, and the foaming agent is introduced at a pressure of 0.3-0.6 MPa. The mold temperature is controlled at 40-60 ° C. After cooling and molding, a flame retardant polystyrene foam board is obtained; S3: flame retardant polystyrene foam board further treated; The further processing method of the flame retardant polystyrene foam board comprises the following steps: Step 1: Preparation: Punch holes on the surface of a flame-retardant polystyrene foam board with a hole diameter of 0.5-1 mm and a hole spacing of 5-10 mm to obtain a first foam board, which is set aside. Weigh KH-560, ethanol, and deionized water in a mass ratio of 1:15:5 to prepare a silane coupling agent solvent, which is set aside. Weigh a liquid flame retardant liquid prepared by mixing magnesium hydroxide and ethanol in a mass ratio of 1:9 to prepare a liquid flame retardant liquid, which is set aside. Step 2: Coupling agent treatment: immersing the first foam board in a silane coupling agent solvent, soaking for 15-20 minutes at room temperature, and then draining to obtain a second foam board; Step 3: Loading with flame retardant liquid: immerse the second foam board in liquid flame retardant liquid, soak at room temperature for 10-15 minutes, drain, and let stand for 1-2 hours to obtain a third foam board; Step 4: perfluorohexanone loading, immerse the third foam board in liquid perfluorohexanone at 20-25°C for 30-60 minutes, then take out the third foam board and transfer it to a drying oven, set the temperature at 25-30°C, and dry it for 4-6 hours to complete the further treatment of the flame retardant polystyrene foam board.

2. The production process of the flame retardant polystyrene foam board according to claim 1, characterized in that: The foaming agent is selected from any one of pentane, butane or cyclohexane.

3. The production process of the flame retardant polystyrene foam board according to claim 1, characterized in that: The cross-linking agent is selected from either sulfur or sodium sulfide.

4. The production process of the flame retardant polystyrene foam board according to claim 1, characterized in that: The plasticizer is dioctyl phthalate.

5. The production process of the flame retardant polystyrene foam board according to claim 1, characterized in that: In step 1, the amount of deionized water is 20-30 times the total mass of ferrous chloride and ferric chloride. In step 2, the mass ratio of the ferrosoferric oxide core to methanol is 1:(20-30), the mass ratio of the ferrosoferric oxide core, 2-methylimidazole and zinc nitrate is 1:(5-10):(3-6), and in step 3, the volume ratio of the core-shell particles to perfluorohexanone is 1:

3.

6. The production process of the flame retardant polystyrene foam board according to claim 1, characterized in that: The volume ratio of the first foam plate to the silane coupling agent solvent is 1: (3-5), the volume ratio of the second foam plate to the liquid flame retardant liquid is 1: (3-5), and the volume ratio of the third foam plate to the liquid perfluorohexanone is 1: (3-5).

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