High-impact-resistance flame-retardant foaming diffusion plate and preparation method thereof

Abstract

The invention discloses a high-impact-resistance flame-retardant foaming diffusion plate and a preparation method thereof.The preparation method comprises the steps that SBS-g-GMA is prepared, polyimide microspheres are prepared, GPPS resin, SBS-g-GMA, polyimide microspheres, an ultraviolet light absorber and other components are mixed to be uniform, melt extrusion molding is conducted, and the like. According to the present invention, the haze is 90-95%, the center brightness achieves more than 2000, the average brightness achieves more than 1600, the impact strength achieves more than 10 Kg-cm / cm, the flame retardation achieves the V0 level, the pores are fine and uniform, the cost is saved, the optical performance is ensured, and the effects of light weight, high impact resistance and high flame retardation are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of diffusion plates, in particular to a high-impact flame-retardant foamed diffusion plate and a preparation method thereof. Background Art

[0002] With the rapid development of modern lighting and display technologies, the demand for diffuser panels is not limited to traditional optical performance, but also emphasizes improvements in safety and durability. As a key component, diffuser panels effectively change the path of light by utilizing the refraction, reflection, and scattering that occurs when light propagates between different media, effectively diffusing the incident light and producing a uniform and soft optical effect. This characteristic has led to their widespread application in LED lighting, liquid crystal displays (LCDs), and other fields.

[0003] Traditional diffusers are usually based on general-purpose polystyrene (GPPS) resin. Although GPPS resin has good light transmittance, its impact resistance and flame retardancy are poor, making it difficult to meet high-impact environments and increasingly stringent safety standards. It generally needs to be used in combination with PC resin, aliphatic polyketone (POK) resin, etc. to improve the impact resistance of the diffuser, but this will lead to increased production costs. In addition, in order to improve the impact resistance of the diffuser, toughening agents are usually added, but simple toughening will lead to a decrease in the optical effect and flame retardancy of the diffuser; similarly, in order to improve the flame retardancy of the diffuser, existing technologies mostly rely on the addition of halogen or phosphorus flame retardants. Although it can improve the fire rating, it can easily lead to a significant decrease in the mechanical and optical properties of the diffuser; therefore, the core challenge currently facing this field is how to achieve a synergistic enhancement of the impact resistance and flame retardancy of the diffuser without sacrificing optical performance. Summary of the Invention

[0004] In order to solve the above problems, one of the purposes of the present invention is to provide a method for preparing a high-impact flame-retardant foamed diffuser plate, comprising the following steps: Preparation of SBS-g-GMA; Preparation of polyimide microspheres; 71-85 parts by mass of GPPS resin, 6-10 parts of polyimide microspheres, 0.6-1 part of a second antioxidant, 0.3-0.7 parts of a UV absorber, 0.5-0.9 parts of a hindered amine light stabilizer, 1-5 parts of a phosphorus-based flame retardant, 0.8-1.6 parts of a foaming agent, and 5.8-9.8 parts of SBS-g-GMA are uniformly mixed to obtain a mixture A, and the mixture A is then fed into a single-screw extruder; the single-screw extruder is then heated to melt the mixture A, and then extruded by the single-screw extruder to obtain a finished product; Among them, the temperature of each zone of the single-screw extruder is: zone 1 temperature is 180-190℃, zone 2 temperature is 190-200℃, zone 3 temperature is 210-220℃, zone 4 temperature is 210-220℃, zone 5 temperature is 225-235℃, zone 6 temperature is 215-225℃, zone 7 temperature is 210-220℃, and the die head temperature is 205-215℃.

[0005] Furthermore, the preparation of SBS-g-GMA includes the following steps: adding 2-6 parts of the first antioxidant to 85-95 parts of SBS by mass, melting and mixing uniformly, then adding 2-6 parts of GMA and 1-3 parts of liquid paraffin and continuing to mix to obtain the SBS-g-GMA.

[0006] Furthermore, the first antioxidant consists of 1-3 parts of antioxidant 1010 and 1-3 parts of antioxidant 7910.

[0007] Furthermore, the preparation of polyimide microspheres includes the following steps: adding 3-4 parts of ODA and 0.5-1.5 parts of SDBS to 13-17 parts of DMF, by weight, to form a dispersed phase; dispersing 3.5-5.5 parts of Tween 85 in 60-72 parts of liquid paraffin to form a continuous phase; mixing the continuous phase and the dispersed phase to form an emulsion, adding 2-3 parts of PMDA to the emulsion under stirring, and reacting for 3-5 hours; after the reaction is completed, adding 3-4 parts of pyridine and 3-5 parts of acetic anhydride to carry out chemical imidization, then step-by-step increasing the temperature to carry out thermal imidization, and filtering and drying to obtain the polyimide microspheres.

[0008] Furthermore, the step-wise heating process involves first heating to 100°C at a rate of 1-2°C per minute, holding the temperature for 0.5-1 hour, then heating to 200°C at a rate of 1-2°C per minute, holding the temperature for 1-2 hours, and finally heating to 250°C at a rate of 1°C per minute, holding the temperature for 0.5-1 hour. Step-wise heating is a critical step in the preparation of polyimide microspheres; heating too quickly can cause the microspheres to deform, break, or agglomerate.

[0009] Furthermore, the second antioxidant is any one of antioxidant 1024, antioxidant 1010 or antioxidant 1076.

[0010] Furthermore, the ultraviolet absorber is selected from ultraviolet absorber UV-329 and / or ultraviolet absorber UV-531.

[0011] Furthermore, the hindered amine light stabilizer is selected from any one of light stabilizer 770, light stabilizer 944 or light stabilizer 622.

[0012] Furthermore, the foaming agent is sodium bicarbonate.

[0013] Another object of the present invention is to provide a high-impact flame-retardant foamed diffuser plate obtained by the above preparation method.

[0014] The beneficial effects are: the light transmittance of the foamed diffusion plate prepared in the present application is between 40% and 45%, between 90% and 95%, the center brightness reaches more than 2000, the average brightness reaches more than 1600, the impact strength reaches more than 10Kg-cm / cm, the flame retardancy reaches V0 level, the bubbles are small and uniform, which not only saves costs but also achieves lightweight, high impact resistance and high flame retardancy while ensuring optical properties.

[0015] This application mainly improves the impact strength of the diffuser plate from the following three aspects: 1. Interface enhancement: The SBS phase in SBS-g-GMA is a thermoplastic elastomer, which can improve the flexibility and impact resistance of the diffuser plate. The GMA phase contains epoxy groups, which can react with the carboxyl groups at the chain ends of GPPS during the melt blending process to form a graft copolymer in situ. At the same time, the epoxy groups can also open the ring and react with the amino or carboxyl groups on the surface of the polyimide microspheres to form chemical bonds. This can greatly improve the interfacial bonding strength between the originally incompatible components, and interfacial bonding strength is a key factor in improving the impact resistance of the diffuser plate. 2. Stress transfer: Thanks to the strong interface bonding mentioned above, the polyimide microspheres are ultra-finely dispersed and stably present in the GPPS matrix. When the diffuser plate is impacted, the stress is effectively transferred from the relatively weak GPPS matrix to the high modulus polyimide microspheres. 3. Energy dissipation: The strong interface bonding can prevent the polyimide microspheres from falling off from the GPPS matrix, forcing the crack to expand, which consumes huge energy. At the same time, the strong interface network enables the SBS phase to fully absorb and dissipate the impact energy. In addition, polyimide microspheres, as nucleating agents, can promote the formation of smaller and more uniform pore structures during the foaming process, improving the light diffusion effect of the diffuser plate. When the diffuser plate is impacted, it can also absorb additional energy through deformation, bending and rupture of the pore walls, preventing crack expansion and further improving the impact toughness of the diffuser plate.

[0016] At the same time, the flame retardant performance of the diffuser is improved from the following two aspects: 1. Stabilization of flame retardant components: The epoxy groups of SBS-g-GMA can also react with the acidic groups of phosphorus-based flame retardants, chemically anchoring the phosphorus-based flame retardants to the polymer chains, significantly reducing the migration and precipitation of the flame retardants and maintaining long-term flame retardancy. Thanks to the strong interfacial network, the polyimide microspheres are ultra-finely dispersed and stably present in the GPPS matrix. When the diffuser plate burns, the polyimide microspheres can more effectively remain in place and participate in carbonization, rather than falling off prematurely, thereby enhancing the integrity of the carbon layer and the barrier effect. 2. Carbon layer strengthening effect: The GPPS matrix itself has poor carbonization properties, and the phosphorus-based flame retardant can catalyze the dehydration and carbonization of the GPPS matrix during combustion. Polyimide itself has excellent flame retardancy and can form a dense carbon layer during combustion. The phosphorus-based flame retardant and polyimide microspheres work together to form a thicker, denser, and more stable protective carbon layer on the surface of the diffuser plate. This carbon layer can not only effectively isolate external heat and oxygen from transferring to the internal substrate, but also prevent the escape of internal flammable volatiles, ultimately achieving an excellent flame retardant effect, greatly improving the flame retardant grade of the diffuser plate, and significantly reducing melt dripping, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 The microstructure of the present application was observed using a scanning electron microscope (SEM). DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0019] The following embodiments are only used to illustrate the present invention, but are not intended to limit the scope of the present invention. Based on the specific embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0020] In the examples of the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art; in the examples of the present invention, unless otherwise specified, the technical means used are conventional means well known to those skilled in the art.

[0021] Source of raw materials: Polystyrene (GPPS) resin, model GPPS-300NT, was purchased from PetroChina Dushanzi Petrochemical Company; Antioxidants were purchased from Shandong Xuxiang Chemical Co., Ltd. UV absorbers were purchased from Jinan Xiangfeng Weiye Chemical Co., Ltd. Hindered amine light stabilizer was purchased from Shanghai Tiandui New Materials Co., Ltd. Phosphorus flame retardant phosphate ester was purchased from Jinan Xiangfeng Weiye Chemical Co., Ltd. Nitrogen-based flame retardant melamine was purchased from Yunsheng Chemical (Shandong) Co., Ltd. Halogen flame retardant decabromodiphenyl ether was purchased from Suzhou Bogerui Chemical Technology Co., Ltd. Sodium bicarbonate was purchased from Shandong Haihua New Materials Co., Ltd. Styrene-butadiene-styrene block copolymer (SBS) was purchased from Guangzhou Taijiqing Energy Co., Ltd.; Glycidyl methacrylate (GMA) was purchased from Shandong Hongrun Chemical Co., Ltd. Liquid paraffin was purchased from Hefeng New Energy Co., Ltd. 4,4'-Diaminodiphenyl ether (ODA) was purchased from Wuhan Qiaofeng Chemical Technology Co., Ltd.; Sodium dodecylbenzenesulfonate (SDBS) was purchased from Shandong Jinli Chemical Co., Ltd. N,N-dimethylformamide (DMF) was purchased from Beijing Bailingwei Technology Co., Ltd.; Tween 85 was purchased from Guangdong Huana Chemical Co., Ltd. Pyromellitic dianhydride (PMDA) was purchased from Jinan Mingxin Chemical Co., Ltd. Pyridine was purchased from Shanghai Denuo Chemical Co., Ltd. Acetic anhydride was purchased from Maoming Xiongda Chemical Co., Ltd. The remaining reagents are commercially available.

[0022] Example 1 This embodiment provides a high-impact flame-retardant foam diffuser plate, the preparation method of which includes the following steps: Preparation of SBS-g-GMA: According to parts by mass, 1 part of antioxidant 1010 and 1 part of antioxidant 7910 were added to 95 parts of SBS, melted and mixed uniformly, and then 2 parts of GMA and 1 part of liquid paraffin were added and continued to mix to obtain the SBS-g-GMA; Preparation of polyimide microspheres: 3 parts of ODA and 0.5 parts of SDBS were added to 13 parts of DMF by weight to form a dispersed phase; 3.5 parts of Tween 85 were dispersed in 72 parts of liquid paraffin to form a continuous phase; the continuous phase and the dispersed phase were mixed to form an emulsion, and 2 parts of PMDA were added to the emulsion under stirring, and the reaction was carried out for 3 hours; after the reaction, 3 parts of pyridine and 3 parts of acetic anhydride were added to carry out chemical imidization, and then thermal imidization was carried out by step-by-step heating, and the polyimide microspheres were obtained after filtration and drying; wherein the step-by-step heating specifically comprises first heating to 100°C at a heating rate of 1°C per minute, holding the temperature for 0.5 hour, then heating to 200°C at a heating rate of 1°C per minute, holding the temperature for 1 hour, and then heating to 250°C at a heating rate of 1°C per minute, and holding the temperature for 0.5 hour; According to parts by mass, 85 parts of GPPS resin, 6 parts of polyimide microspheres, 0.6 parts of antioxidant 1024, 0.3 parts of ultraviolet absorber UV-329, 0.5 parts of light stabilizer 770, 1 part of phosphorus flame retardant phosphate, 0.8 parts of sodium bicarbonate, and 5.8 parts of SBS-g-GMA are stirred evenly to obtain a mixture A, and the mixture A is then put into a single-screw extruder; then, the single-screw extruder is heated to melt the mixture A, and then the finished product is extruded by the single-screw extruder; the temperatures of each zone of the single-screw extruder are: the temperature of zone 1 is 180°C, the temperature of zone 2 is 190°C, the temperature of zone 3 is 210°C, the temperature of zone 4 is 210°C, the temperature of zone 5 is 225°C, the temperature of zone 6 is 215°C, the temperature of zone 7 is 210°C, and the die head temperature is 205°C.

[0023] Example 2 This embodiment provides a high-impact flame-retardant foam diffuser plate, the preparation method of which includes the following steps: Preparation of SBS-g-GMA: According to parts by mass, 1 part of antioxidant 1010 and 3 parts of antioxidant 7910 were added to 90 parts of SBS, melted and mixed uniformly, and then 4 parts of GMA and 2 parts of liquid paraffin were added and continued to mix to obtain the SBS-g-GMA; Preparation of polyimide microspheres: 3.5 parts of ODA and 1 part of SDBS were added to 15 parts of DMF by weight to form a dispersed phase; 4.5 parts of Tween 85 were dispersed in 66 parts of liquid paraffin to form a continuous phase; the continuous phase and the dispersed phase were mixed to form an emulsion, 2.5 parts of PMDA were added to the emulsion under stirring, and the reaction was carried out for 4 hours; after the reaction, 3.5 parts of pyridine and 4 parts of acetic anhydride were added to carry out chemical imidization, and then thermal imidization was carried out by step-by-step heating, and the polyimide microspheres were obtained after filtration and drying; wherein the step-by-step heating specifically comprises first heating to 100°C at a heating rate of 2°C per minute, holding the temperature for 0.5 hour, then heating to 200°C at a heating rate of 2°C per minute, holding the temperature for 1 hour, and then heating to 250°C at a heating rate of 1°C per minute, and holding the temperature for 0.5 hour; According to parts by mass, 78 parts of GPPS resin, 8 parts of polyimide microspheres, 0.8 parts of antioxidant 1010, 0.2 parts of ultraviolet absorber UV-329, 0.3 parts of ultraviolet absorber UV-531, 0.7 parts of light stabilizer 944, 3 parts of phosphorus flame retardant phosphate, 1.2 parts of sodium bicarbonate, and 7.8 parts of SBS-g-GMA are stirred uniformly to obtain a mixture A, and the mixture A is then put into a single-screw extruder; then, the single-screw extruder is heated to melt the mixture A, and then extruded by the single-screw extruder to obtain a finished product; the temperatures of each zone of the single-screw extruder are: the temperature of zone 1 is 185° C., the temperature of zone 2 is 195° C., the temperature of zone 3 is 215° C., the temperature of zone 4 is 215° C., the temperature of zone 5 is 230° C., the temperature of zone 6 is 220° C., the temperature of zone 7 is 215° C., and the die head temperature is 210° C.

[0024] Example 3 This embodiment provides a high-impact flame-retardant foam diffuser plate, the preparation method of which includes the following steps: Preparation of SBS-g-GMA: 3 parts by mass of antioxidant 1010 and 3 parts by mass of antioxidant 7910 were added to 85 parts of SBS, melted and mixed, and then 6 parts of GMA and 3 parts of liquid paraffin were added and mixed continuously to obtain the SBS-g-GMA; Preparation of polyimide microspheres: 4 parts of ODA and 1.5 parts of SDBS were added to 17 parts of DMF by weight to form a dispersed phase; 5.5 parts of Tween 85 were dispersed in 60 parts of liquid paraffin to form a continuous phase; the continuous phase and the dispersed phase were mixed to form an emulsion, 3 parts of PMDA were added to the emulsion under stirring, and the reaction was carried out for 5 hours; after the reaction, 4 parts of pyridine and 5 parts of acetic anhydride were added to carry out chemical imidization, and then thermal imidization was carried out by step-by-step heating, and the polyimide microspheres were obtained after filtration and drying; wherein the step-by-step heating specifically comprises first heating to 100°C at a heating rate of 2°C per minute, holding the temperature for 1 hour, then heating to 200°C at a heating rate of 2°C per minute, holding the temperature for 2 hours, and then heating to 250°C at a heating rate of 1°C per minute, and holding the temperature for 1 hour; According to parts by mass, 71 parts of GPPS resin, 10 parts of polyimide microspheres, 1 part of antioxidant 1076, 0.7 parts of ultraviolet absorber UV-531, 0.9 parts of light stabilizer 622, 5 parts of phosphorus flame retardant phosphate, 1.6 parts of sodium bicarbonate, and 9.8 parts of SBS-g-GMA are stirred uniformly to obtain a mixture A, and the mixture A is then put into a single-screw extruder; then, the single-screw extruder is heated to melt the mixture A, and then extruded by the single-screw extruder to obtain a finished product; the temperatures of each zone of the single-screw extruder are: the temperature of zone 1 is 190°C, the temperature of zone 2 is 200°C, the temperature of zone 3 is 220°C, the temperature of zone 4 is 220°C, the temperature of zone 5 is 235°C, the temperature of zone 6 is 225°C, the temperature of zone 7 is 220°C, and the die head temperature is 215°C.

[0025] Comparative Example 1 This comparative example differs from Example 2 in that the amount of GPPS resin is increased from 78 parts to 85.8 parts, and 7.8 parts of SBS-g-GMA are not added. Other components and experimental procedures are the same as those in Example 2.

[0026] Comparative Example 2 This comparative example differs from Example 2 in that the amount of GPPS resin is increased from 78 parts to 86 parts, and polyimide microspheres are not added. Other components and experimental steps are the same as those in Example 2.

[0027] Comparative Example 3 This comparative example differs from Example 2 in that 3 parts of the nitrogen-based flame retardant melamine are used to replace 3 parts of the phosphorus-based flame retardant phosphate. Other components and experimental procedures are the same as those in Example 2.

[0028] Comparative Example 4 This comparative example differs from Example 2 in that 3 parts of the halogen-based flame retardant decabromodiphenyl ether are used to replace 3 parts of the phosphorus-based flame retardant phosphate ester. Other components and experimental steps are the same as those in Example 2.

[0029] The diffuser plates prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were tested.

[0030] Test method: Heat distortion temperature is tested according to ASTM D648 standard; Impact strength is tested according to ASTM D256 standard; Flame retardancy is tested according to UL94 standard; Light transmittance and haze are tested according to ASTM D1003 standard; Density is tested according to ASTM D792; The center brightness and average brightness were tested according to the GY / T 326-2019 standard. The test results are shown in Table 1.

[0031] Table 1 Diffuser plate performance test results

[0032] From the data in the table, it can be analyzed that the diffusion plates prepared in Examples 1-3 have an impact strength of more than 10 kg-cm / cm, a flame retardancy of V0 level, a light transmittance between 40% and 45%, a haze between 90% and 95%, a center brightness of more than 2000, an average brightness of more than 1600, and small and uniform pores, which not only saves costs but also achieves lightweight, high impact resistance and high flame retardancy while ensuring optical properties.

[0033] Compared with Example 2, due to the lack of SBS-g-GMA in Comparative Example 1, the interface compatibility of the components decreases, the optical properties deteriorate, and the impact stress cannot be effectively transferred from the GPPS matrix to the high modulus polyimide microspheres. The polyimide microspheres are prone to lack of strong interface network fixation and are easy to fall off from the GPPS matrix, and the crack propagation resistance is reduced. When the diffuser plate is impacted, interfacial peeling is prone to occur, and the impact strength drops sharply to 3.2Kg-cm / cm. At the same time, the phosphorus-based flame retardant cannot be anchored on the polymer chain through SBS-g-GMA, and is easy to migrate and precipitate, resulting in a loose carbon layer, which deteriorates the heat insulation and oxygen isolation capabilities of the diffuser plate, and the flame retardant grade drops from V0 to HB.

[0034] Compared with Example 2, Comparative Example 2 lacks high modulus polyimide microspheres as stress fulcrums, so the impact stress cannot be effectively dispersed from the GPPS matrix, and the impact strength drops to 4.5 kg-cm / cm. In addition, the nucleation effect of the polyimide microspheres is lost, the bubbles are coarse and unevenly distributed, the optical properties of the diffuser plate deteriorate, and it is difficult to form a dense protective carbon layer by relying solely on the phosphorus-based flame retardant, and no effective barrier can be formed, and the flame retardancy drops to HB level.

[0035] Compared with Example 2, in Comparative Example 3, after replacing the phosphorus-based flame retardant phosphate with the nitrogen-based flame retardant melamine, although the nitrogen-based flame retardant can also react with the epoxy group of SBS-g-GMA, its reaction activity is low and the anchoring efficiency is much lower than that of the phosphorus-based acidic group, and it is easy to migrate and precipitate; and because the nitrogen-based flame retardant mainly releases inert gases such as NH3 through endothermic decomposition to dilute the combustible gas and cool the substrate, the flame retardant efficiency is low and a high addition amount is required. At the same time, the nitrogen-based flame retardant has poor carbonization and is difficult to cooperate with the polyimide microspheres to form a dense protective carbon layer, and cannot achieve the same flame retardant effect as the present application.

[0036] Compared with Example 2, in Comparative Example 4, after replacing the phosphorus-based flame retardant phosphate ester with the halogen-based flame retardant decabromodiphenyl ether, the halogen-based flame retardant does not contain an acidic group and cannot react with the epoxy group of SBS-g-GMA, resulting in easy migration and precipitation of the flame retardant and decreased flame retardancy; and since the halogen-based flame retardant mainly acts through gas phase flame retardancy, it cannot form a synergistic carbonizing effect with the polyimide microspheres, resulting in insufficient thickness and density of the carbon layer, and the barrier effect is far worse than that of the embodiment.

[0037] The above is merely an embodiment of the present invention and is not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A method for preparing a high impact flame retardant foam diffuser plate, characterized in that: The following steps are involved: Preparation of SBS-g-GMA; Preparation of polyimide microspheres; 71-85 parts by mass of GPPS resin, 6-10 parts of polyimide microspheres, 0.6-1 part of a second antioxidant, 0.3-0.7 parts of a UV absorber, 0.5-0.9 parts of a hindered amine light stabilizer, 1-5 parts of a phosphorus-based flame retardant, 0.8-1.6 parts of a foaming agent, and 5.8-9.8 parts of SBS-g-GMA are uniformly mixed to obtain a mixture A, and the mixture A is then fed into a single-screw extruder; the single-screw extruder is then heated to melt the mixture A, and then extruded by the single-screw extruder to obtain a finished product; Among them, the temperature of each zone of the single-screw extruder is: zone 1 temperature is 180-190℃, zone 2 temperature is 190-200℃, zone 3 temperature is 210-220℃, zone 4 temperature is 210-220℃, zone 5 temperature is 225-235℃, zone 6 temperature is 215-225℃, zone 7 temperature is 210-220℃, and the die head temperature is 205-215℃.

2. The method for preparing a high-impact flame-retardant foamed diffuser plate according to claim 1, characterized in that: Preparation of SBS-g-GMA The method comprises the following steps: according to parts by mass, adding 2-6 parts of a first antioxidant to 85-95 parts of SBS, melting and mixing them uniformly, then adding 2-6 parts of GMA and 1-3 parts of liquid paraffin and continuing to mix to obtain the SBS-g-GMA.

3. The method for preparing a high-impact flame-retardant foamed diffuser plate according to claim 2, characterized in that: The first antioxidant consists of 1-3 parts of antioxidant 1010 and 1-3 parts of antioxidant 7910.

4. The method for preparing a high impact flame retardant foamed diffuser plate according to claim 1, characterized in that: The preparation of polyimide microspheres comprises the following steps: adding 3-4 parts of ODA and 0.5-1.5 parts of SDBS to 13-17 parts of DMF, calculated by weight, to form a dispersed phase; dispersing 3.5-5.5 parts of Tween 85 in 60-72 parts of liquid paraffin to form a continuous phase; mixing the continuous phase and the dispersed phase to form an emulsion; adding 2-3 parts of PMDA to the emulsion under stirring, and reacting for 3-5 hours; after the reaction is completed, adding 3-4 parts of pyridine and 3-5 parts of acetic anhydride to carry out chemical imidization, then step-by-step increasing the temperature to carry out thermal imidization, and filtering and drying to obtain the polyimide microspheres.

5. The method for preparing a high-impact flame-retardant foamed diffuser plate according to claim 4, characterized in that: The step-by-step heating is specifically as follows: first heating to 100°C at a heating rate of 1-2°C per minute, keeping warm for 0.5-1h, then heating to 200°C at a heating rate of 1-2°C per minute, keeping warm for 1-2h, and then heating to 250°C at a heating rate of 1°C per minute, keeping warm for 0.5-1h.

6. The method for preparing a high impact flame retardant foamed diffuser plate according to claim 1, characterized in that: The second antioxidant is any one of antioxidant 1024, antioxidant 1010 or antioxidant 1076.

7. The method for preparing a high impact flame retardant foam diffuser plate according to claim 1, characterized in that: The ultraviolet absorber is selected from ultraviolet absorber UV-329 and / or ultraviolet absorber UV-531.

8. The method for preparing a high-impact flame-retardant foamed diffuser plate according to claim 1, characterized in that: The hindered amine light stabilizer is selected from any one of light stabilizer 770, light stabilizer 944 or light stabilizer 622.

9. The method for preparing a high impact flame retardant foam diffuser plate according to claim 1, characterized in that: The foaming agent is sodium bicarbonate.

10. A high impact flame retardant foam diffuser plate, characterized in that: It is made according to the method for preparing a high-impact flame-retardant foamed diffuser plate according to any one of claims 1 to 9.

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