Flame-retardant styrene polymer composition as well as preparation method and application thereof

Abstract

The invention provides a flame-retardant styrene polymer composition as well as a preparation method and application thereof, and the flame-retardant styrene polymer composition comprises the following components in parts by weight: 50-80 parts of a styrene polymer; 10-19 parts of a brominated flame retardant; 1-7 parts of a bismuth-containing compound; 3-15 parts of a toughening agent; 0-2 parts of an anti-dripping agent; the bismuth-containing compound comprises bismuth oxide and / or bismuth oxychloride. According to the flame-retardant styrene polymer composition disclosed by the invention, under the condition that antimony oxide is not added, the flame-retardant performance is excellent, and the impact strength and the surface glossiness are relatively high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high molecular flame-retardant materials, and particularly relates to a flame-retardant styrene polymer composition, a preparation method and application thereof. BACKGROUND

[0002] Styrene polymers such as acrylonitrile-butadiene-styrene (ABS) have excellent rigidity, toughness and easy processability, and are widely used as housings for household appliances, electronic communication, building decoration and rail transit parts. In these applications, flame retardancy is a necessary performance requirement, and is usually provided by a flame retardant system composed of a bromine-based flame retardant and antimony trioxide. However, with the global depletion of antimony ore resources, the price of antimony trioxide is gradually increasing. In addition, the bromine-antimony synergistic flame retardant produces carcinogenic antimony-containing compounds during combustion, causing secondary harm. This makes the bromine-antimony synergistic flame retardant technology face great market and environmental pressure.

[0003] Although there is a clear demand in the market for low-antimony trioxide or no-antimony trioxide flame-retardant plastics at present, such plastics usually have problems such as insufficient flame-retardant efficiency, impact strength degradation and appearance defects. For example, CN110520467A discloses a flame-retardant styrene-containing composition comprising: an impact-modified styrene-containing polymer; at least one bromine-containing flame retardant; at least one metal dialkylphosphinate; and at least one anti-dripping agent, wherein the total concentration of the bromine-containing flame retardant and the metal dialkylphosphinate is less than 28% by weight. The synergistic effect of the metal dialkylphosphinate and the bromine-containing flame retardant in the composition can provide the composition with better flame-retardant performance, but the impact strength and surface gloss are severely cracked.

[0004] Therefore, how to achieve good flame-retardant performance, impact strength and surface gloss without adding antimony trioxide is a technical problem to be solved in the field at present. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present application is to provide a flame-retardant styrene polymer composition, a preparation method and application thereof. The flame-retardant styrene polymer composition has excellent flame-retardant performance, high impact strength and high surface gloss without adding antimony trioxide.

[0006] To achieve this purpose, the present application adopts the following technical solutions:

[0007] In a first aspect, the present application provides a flame-retardant styrene polymer composition, which comprises the following components in parts by weight:

[0008] 50-80 parts of a styrene polymer;

[0009] 10-19 parts of brominated flame retardant;

[0010] 1 to 7 parts of bismuth-containing compounds;

[0011] 3-15 parts toughening agent;

[0012] 0-2 parts of anti-dripping agent;

[0013] The bismuth-containing compounds include bismuth oxide and / or bismuth oxychloride.

[0014] In the flame-retardant styrene polymer composition provided by this invention, the brominated flame retardant and the bismuth-containing compound synergistically decompose under heating conditions to generate bismuth oxybromine active free radicals. These active free radicals can efficiently capture free radicals generated by resin pyrolysis, inhibit the chain reaction, block the combustion reaction, and reduce the flame propagation speed. Compared with using only brominated flame retardants, the addition of bismuth-containing compounds can synergistically retard flames, not only reducing the amount of brominated flame retardant required but also avoiding dependence on antimony oxide, thus offering both economic and environmental benefits. The flame-retardant styrene polymer composition may not contain antimony oxide (wherein, the absence of antimony oxide can be considered as the antimony content in the composition being ≤10ppm), exhibiting not only excellent flame-retardant properties but also high impact strength and surface gloss.

[0015] In this invention, 50 to 80 parts of styrene-based polymer, for example, can be 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, 62 parts, 65 parts, 68 parts, 70 parts, 72 parts, 75 parts, 78 parts, 80 parts, or any range between the above values. In this invention, the mass percentage of styrene-based polymer in the flame-retardant styrene-based polymer composition is ≥50%.

[0016] In this invention, 10 to 19 parts of brominated flame retardant can be, for example, 10 parts, 10.5 parts, 11 parts, 11.5 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts, 14.5 parts, 15 parts, 15.5 parts, 16 parts, 16.5 parts, 17 parts, 17.5 parts, 18 parts, 19 parts, or any range of the above values.

[0017] In this invention, 1 to 7 parts of bismuth-containing compound, for example, can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts, 7 parts, or any range of the above values.

[0018] In this invention, 3 to 15 parts of toughening agent, for example, can be 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, or any range between the above values.

[0019] In this invention, 0 to 2 parts of anti-drip agent can be, for example, 0.1 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, or any range of the above values.

[0020] Preferably, the styrene polymer includes at least one of acrylonitrile-butadiene-styrene copolymer, styrene-acrylonitrile copolymer, styrene-butadiene copolymer, or polystyrene.

[0021] In this invention, the melt index of the acrylonitrile-butadiene-styrene copolymer at 220°C and 10 kg is 6~80 g / 10 min.

[0022] Preferably, the brominated flame retardant includes at least one of decabromodiphenyl ether, tetrabromobisphenol A, tris(tribromophenoxy)triazine, brominated polystyrene, brominated epoxy polymer, brominated polyacrylate, decabromodiphenyl ethane, or brominated polycarbonate.

[0023] Preferably, the D50 particle size of the bismuth-containing compound is ≤15 μm, for example, it can be 15 μm, 14.5 μm, 14 μm, 13.5 μm, 13 μm, 12.5 μm, 12 μm, 11.5 μm, 11 μm, 10.5 μm, 10 μm, 9.5 μm, 9 μm, 8.5 μm, 8 μm, 7.5 μm, 7 μm, 6.5 μm, 6 μm, 5 μm. The value is 5μm, 5μm, 4.8μm, 4.6μm, 4.4μm, 4.2μm, 4μm, 3.8μm, 3.6μm, 3.4μm, 3.2μm, 3μm, 2.5μm, 2.6μm, 2.4μm, 2.2μm, 2μm, 1.8μm, 1.6μm, 1.4μm, 1.2μm, 1μm, or any of the above values, preferably ≤5μm.

[0024] In this invention, controlling the D50 particle size of the bismuth-containing compound within a specific range can reduce the impact on the surface gloss and impact strength of the material, thereby achieving excellent overall performance.

[0025] In this invention, the D50 particle size of bismuth-containing compounds is tested using the following method: 0.1~0.2g of the bismuth-containing compound sample powder to be tested is placed in a beaker, 10~50mL of ethanol is added, and the sample is ultrasonically dispersed in an ultrasonic instrument at 15~30℃ for 5~10min. Then, laser particle size analysis is performed using a laser particle size analyzer.

[0026] Preferably, the anti-dripping agent includes a polytetrafluoroethylene-based anti-dripping agent.

[0027] In this invention, the anti-dripping agent can be selected with reference to existing technology, such as at least one of SN3201, SN80-SA7, POLY TS 30A, and PTFE-200D.

[0028] Preferably, the flame-retardant styrene polymer composition further includes 0 to 2 parts of antioxidant by weight, for example, 0 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, or any range of the above values.

[0029] Preferably, the antioxidant includes at least one of phenolic antioxidants, phosphite antioxidants, divalent sulfur antioxidants, or hindered amine antioxidants.

[0030] The specific types of phenolic antioxidants, phosphite antioxidants, divalent sulfur antioxidants, or hindered amine antioxidants described in this invention can be selected with reference to existing technologies. Specifically, the phenolic antioxidants include 2,6-di-tert-butyl-4-methylphenol (antioxidant 264), pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] (antioxidant Y-001), N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine (antioxidant 1098), n-octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate (antioxidant 1076), and styrene. At least one of the following: phenol (antioxidant SP), 2,2'-methylenebis(4-methyl-6-tert-butylphenol) (antioxidant 2246), 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane (antioxidant CA), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene (antioxidant 330), or 1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl) (antioxidant 3114). The phosphite antioxidants include at least one of tris(nonylphenyl) phosphite (antioxidant TNP), the reaction product of N-phenylaniline and 2,4,4-trimethylpentene (antioxidant ODP), tris[2,4-di-tert-butylphenyl] phosphite (antioxidant Y-002), bis(4-octylphenol) diphosphate (antioxidant 1093), or diethyl 3,5-di-tert-butyl-4-hydroxybenzoate (antioxidant 1222). The divalent sulfur antioxidants include dilaurate thiodipropionate (DLTP) and / or distearate thiodipropionate (DSTP). The hindered amine antioxidants include at least one of LS-744, bis-2,2,6,6-tetramethylpiperidinol sebacate (such as LS-770), tris(1,2,2,6,6-pentamethylpiperidinol) phosphite (GW-540), or FlamstabNOR116.

[0031] Without affecting the effect of the flame-retardant styrene polymer composition of the present invention, other processing aids may be added as needed. Other processing aids include, but are not limited to, fillers, antistatic agents, weathering agents, lubricants, colorants, etc.

[0032] In this invention, the filler can be selected with reference to existing technology, such as including but not limited to glass fiber. Specifically, the flame-retardant styrene polymer composition contains 0 to 30 parts by weight of filler, for example, 0 parts, 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, or any range between the above values.

[0033] In this invention, the antistatic agent can be selected with reference to existing technologies, such as, but not limited to, polyetheramide antistatic agents. Specifically, the flame-retardant styrene polymer composition contains 0 to 30 parts by weight of antistatic agent, for example, 0 parts, 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, or any range between the above values.

[0034] In this invention, the weathering agent can be selected with reference to existing technologies, such as, but not limited to, hindered amine light stabilizers and / or benzotriazole UV absorbers. Specifically, the hindered amine light stabilizer is at least one of UV-3808, LA-402XP, or LA-402AF. Specifically, the flame-retardant styrene polymer composition contains 0 to 1 part by weight of the weathering agent, for example, it can be 0 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, or any range between the above values.

[0035] In this invention, the lubricant can be selected with reference to existing technologies, including but not limited to at least one of low molecular weight esters, metallic soaps, stearic acid complex esters, or amides. Specifically, the low molecular weight esters include at least one of solid paraffin, liquid paraffin, or low molecular weight polyolefin wax; the metallic soaps include at least one of calcium stearate, magnesium stearate, zinc stearate, or barium stearate; the stearic acid complex esters include at least one of ethylene glycol stearate, glyceryl stearate, or pentaerythritol stearate; and the amides include at least one of erucamide, methylene bis-stearamide, or N,N-ethylene bis-stearamide. Specifically, the flame-retardant styrene polymer composition contains 0 to 2 parts by weight of lubricant, for example, 0 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 2 parts, or any range between the above values.

[0036] In this invention, the colorant can be selected with reference to existing technologies, such as including but not limited to titanium dioxide. Specifically, the flame-retardant styrene polymer composition contains 0 to 5 parts by weight of colorant, for example, 0 parts, 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, or any range between the above values.

[0037] Preferably, the toughening agent includes at least one of butadiene graft copolymer, chlorinated polyethylene, or silicone rubber.

[0038] Preferably, the butadiene graft copolymer includes butadiene-grafted styrene-acrylonitrile copolymer (butadiene-grafted SAN copolymer) and / or butadiene-grafted methyl methacrylate-styrene copolymer (butadiene-grafted MS copolymer).

[0039] In this invention, the butadiene-grafted SAN copolymer can be obtained commercially or prepared using conventional methods. Exemplarily, the butadiene-grafted SAN copolymer is prepared using an emulsion method, specifically comprising: using butadiene rubber latex as a toughening matrix, styrene and acrylonitrile as grafting monomers, sodium dodecyl sulfate as an emulsifier, and potassium persulfate as an initiator, reacting at 70-80°C to obtain the butadiene-grafted SAN copolymer. The acrylonitrile has a weight percentage of 2-10%, for example, 2%, 4%, 6%, 8%, 10%, or any of the above values; the butadiene has a weight percentage of 50-80%, for example, 50%, 55%, 60%, 65%, 70%, 75%, 80%, or any of the above values; and the styrene has a weight percentage of 18-30%, for example, 18%, 20%, 22%, 24%, 26%, 28%, 30%, or any of the above values.

[0040] In this invention, the butadiene-grafted MS copolymer can be obtained commercially or prepared using conventional methods. Exemplarily, when the butadiene-grafted MS copolymer is prepared using emulsion polymerization, the specific steps include: using butadiene rubber latex as a toughening matrix, styrene and methyl methacrylate as grafting monomers, sodium dodecyl sulfate as an emulsifier, and potassium persulfate as an initiator, reacting at 70-80°C to obtain the butadiene-grafted MS copolymer. The weight percentage of methyl methacrylate is 5-15%, for example, 5%, 6%, 8%, 10%, 12%, 15%, or any of the above values; the weight percentage of butadiene is 50-80%, for example, 50%, 55%, 60%, 65%, 70%, 75%, 80%, or any of the above values; and the weight percentage of styrene is 15-35%, for example, 15%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 35%, or any of the above values. In the butadiene-grafted MS copolymer, the rubber core is polybutadiene or butadiene-styrene block copolymer SBR rubber; the shell is a copolymer of methyl methacrylate and styrene.

[0041] In this invention, the weight-average molecular weight of the chlorinated polyethylene ranges from 100,000 to 500,000, for example, it can be 100,000, 150,000, 200,000, 250,000, 300,000, 350,000, 400,000, 450,000, 500,000 or any of the above values; the weight percentage of chlorine is 20% to 45%, for example, it can be 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 45% or any of the above values, preferably 25% to 35%.

[0042] In this invention, the weight-average molecular weight of the silicone rubber is 50,000 to 1,000,000, for example, it can be 50,000, 100,000, 200,000, 300,000, 400,000, 500,000, 600,000, 700,000, 800,000, 900,000, 1,000,000 or any of the above values, and the weight percentage of silicon is 10% to 40%, for example, it can be 10%, 15%, 20%, 25%, 30%, 35%, 40% or any of the above values.

[0043] In a second aspect, the present invention provides a method for preparing a flame-retardant styrene polymer composition as described in the first aspect of the present invention, the preparation method comprising the following steps:

[0044] The components are melt-blended and then extruded and granulated to obtain the flame-retardant styrene polymer composition.

[0045] Preferably, the preparation method of the flame-retardant styrene polymer composition specifically includes the following steps:

[0046] Weigh the materials according to the formula, put them into the mixer and mix at a speed of 800~1200 r / min for 3~8 minutes. Then take them out and put the mixed materials into the feed hopper of the twin-screw extruder. Set the process conditions, including the temperature setting range of each section of the extruder is 180~240℃ and the screw speed is 200~800 r / min. After melt blending in the twin-screw extruder, water-cool the strands and pelletize them.

[0047] Thirdly, the present invention provides a flame-retardant styrene polymer product, said flame-retardant styrene polymer product being formed from the flame-retardant styrene polymer composition described in the first aspect of the present invention.

[0048] This invention provides the application of the above-mentioned flame-retardant styrene polymer composition in the manufacture of toys, household goods, electronic components, home appliances, gardening equipment, medical technology equipment, motor vehicle parts, or vehicle body parts. In particular, it provides the application of the above-mentioned flame-retardant styrene polymer composition in the manufacture of parts with excellent impact resistance, flame retardancy, and high gloss properties; specifically, in the fields of household appliance housings, battery housings, and office automation equipment housings.

[0049] The numerical range described in this invention includes not only the point values ​​listed above, but also any point values ​​within the numerical ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not exhaustively list all the specific point values ​​included in the range.

[0050] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0051] In the flame-retardant styrene polymer composition provided by this invention, the brominated flame retardant and the bismuth-containing compound synergistically decompose under heating conditions to generate bismuth oxybromine active free radicals. These active free radicals can efficiently capture free radicals generated by resin pyrolysis, inhibit the chain reaction, block the combustion reaction, and reduce the flame propagation speed. Compared with using only brominated flame retardants, the addition of bismuth-containing compounds can synergistically retard flames, not only reducing the amount of brominated flame retardant required but also avoiding dependence on antimony oxide, thus offering both economic and environmental benefits. The flame-retardant styrene polymer composition exhibits excellent flame-retardant properties, as well as high impact strength and surface gloss, without the need for antimony oxide. Detailed Implementation

[0052] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0053] In this invention, the materials used in the examples and comparative examples are all commercially available or prepared using conventional methods. Unless otherwise specified, the materials used in this invention are as follows:

[0054] A. Styrene polymers:

[0055] A1: Acrylonitrile-butadiene-styrene copolymer 1: ABS KF-718, Liaoning Kingfa Science & Technology Co., Ltd., according to ISO1133-2011, the melt index is 11.9 g / 10 min at 220℃ and 10 kg.

[0056] A2: Acrylonitrile-butadiene-styrene copolymer 2: ABS KF-730, Liaoning Kingfa Science & Technology Co., Ltd., according to ISO1133-2011, the melt index is 28.9 g / 10 min at 220℃ and 10 kg.

[0057] B. Bromine-based flame retardants:

[0058] B1: Tris(tribromophenoxy)triazine, FR-245, ICL-IP;

[0059] B2: Brominated polyacrylate, FR-1025, ICL-IP;

[0060] B3: Brominated polystyrene, SR-3010, Shandong Xurui;

[0061] B4: Brominated epoxy, F-3014, ICL-IP.

[0062] C. Bismuth-containing compounds:

[0063] C1: Bismuth trioxide (Bi2O3), Hunan Rare Energy New Materials Co., Ltd., D50=4.2μm;

[0064] C2: Bismuth oxychloride (BiOCl), Hunan Rare Energy New Materials Co., Ltd., D50=4.1μm;

[0065] C3: Bismuth oxychloride (BiOCl), Hunan Rare Energy New Materials Co., Ltd., D50=9μm.

[0066] D. Toughening agent:

[0067] D1: Butadiene-grafted SAN copolymer, KFG-P60, Liaoning Jinfeng;

[0068] D2: Butadiene-grafted MS copolymer, EM500, LG Chem;

[0069] D3: Chlorinated polyethylene, CPE-132C, Hangzhou Keli;

[0070] D4: Silicone rubber, MR-01, Kanekachi, Japan.

[0071] E. Antioxidants:

[0072] E1: Hindered phenolic antioxidant Y-001, Yingkou Fengguang Chemical Co., Ltd.;

[0073] E2: Phosphite antioxidant Y-002, Yingkou Fengguang Chemical Co., Ltd.

[0074] F. Anti-dripping agent:

[0075] F1: Anti-dripping agent SN3201, Guangzhou Entropy Energy Innovation Materials Co., Ltd.

[0076] G. Aluminum hypophosphite flame retardant:

[0077] G1: Aluminum diethylphosphinic acid NP-1060, Qingdao Ouprui New Materials Co., Ltd., D50=4.3μm.

[0078] Examples 1-20 and Comparative Examples 1-2 each provide a flame-retardant styrene polymer composition. The composition of the flame-retardant styrene polymer composition by weight is shown in Tables 1-3, where " / " indicates that the component is not in the formulation.

[0079] Unless otherwise specified, the preparation method of the flame-retardant styrene polymer composition in this invention includes: weighing the materials according to the formula, mixing them in a mixer at a speed of 1000 r / min for 5 min, taking them out, feeding the mixed materials into the feed hopper of a twin-screw extruder, setting the process conditions, including setting the temperature range of each section of the extruder to 180~240℃, and the screw speed to 500 r / min, performing melt blending in the twin-screw extruder, water cooling, drawing into strips, and pelletizing to obtain the flame-retardant styrene polymer composition, i.e., composite material particles, and drying and injection molding the composite material particles to obtain square plates for flame-retardant performance testing.

[0080] Table 1

[0081]

[0082] Table 2

[0083]

[0084] Table 3

[0085]

[0086] Performance testing:

[0087] (1) Flame retardant rating: According to UL 94-2021 test, the test item is vertical burning, and the sample thickness is 2mm.

[0088] (2) Impact strength of cantilever beam notch: measured according to GB / T 1843-2008, the notch is a 45° V-shaped notch.

[0089] (3) The surface gloss was measured using a gloss meter in accordance with GB / T 8807-1988 standard, with a measurement angle of 60°.

[0090] The specific test results are shown in Table 4.

[0091] Table 4

[0092]

[0093] As shown in Table 4, in the flame-retardant styrene polymer composition provided by this invention, the brominated flame retardant and the bismuth-containing compound synergistically decompose under heating conditions to generate bismuth oxybromine active free radicals. These active free radicals can efficiently capture free radicals generated by resin pyrolysis, inhibit the chain reaction, block the combustion reaction, and reduce the flame propagation speed. Compared with using only brominated flame retardants, the addition of bismuth-containing compounds can synergistically retard flames, not only reducing the amount of brominated flame retardant required but also avoiding dependence on antimony oxide, thus offering both economic and environmental benefits. The flame-retardant styrene polymer composition can exhibit excellent flame-retardant performance, as well as high impact strength and surface gloss, without the addition of antimony oxide.

[0094] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flame-retardant styrene polymer composition, characterized in that, The flame-retardant styrene polymer composition comprises the following components in parts by weight: 50-80 parts of styrene polymers; 10-19 parts of brominated flame retardant; 1 to 7 parts of bismuth-containing compounds; 3-15 parts toughening agent; 0-2 parts of anti-dripping agent; The bismuth-containing compounds include bismuth oxide and / or bismuth oxychloride.

2. The flame-retardant styrene polymer composition according to claim 1, characterized in that, The styrene-based polymers include at least one of acrylonitrile-butadiene-styrene copolymer, styrene-acrylonitrile copolymer, styrene-butadiene copolymer, or polystyrene.

3. The flame-retardant styrene polymer composition according to claim 1, characterized in that, The brominated flame retardant includes at least one of decabromodiphenyl ether, tetrabromobisphenol A, tris(tribromophenoxy)triazine, brominated polystyrene, brominated epoxy polymer, brominated polyacrylate, decabromodiphenyl ethane, or brominated polycarbonate.

4. The flame-retardant styrene polymer composition according to claim 1, characterized in that, The bismuth-containing compound has a D50 particle size ≤15μm, preferably ≤5μm.

5. The flame-retardant styrene polymer composition according to claim 1, characterized in that, The anti-dripping agent includes polytetrafluoroethylene-based anti-dripping agents.

6. The flame-retardant styrene polymer composition according to claim 1, characterized in that, The flame-retardant styrene polymer composition further includes 0-2 parts by weight of antioxidant; Preferably, the antioxidant includes at least one of phenolic antioxidants, phosphite antioxidants, divalent sulfur antioxidants, or hindered amine antioxidants.

7. The flame-retardant styrene polymer composition according to claim 1, characterized in that, The toughening agent includes at least one of butadiene graft copolymer, chlorinated polyethylene, or silicone rubber.

8. The flame-retardant styrene polymer composition according to claim 7, characterized in that, The butadiene graft copolymers include butadiene-grafted styrene-acrylonitrile copolymers and / or butadiene-grafted methyl methacrylate-styrene copolymers.

9. A method for preparing a flame-retardant styrene polymer composition according to any one of claims 1 to 8, characterized in that, The preparation method includes the following steps: The components are melt-blended and then extruded and granulated to obtain the flame-retardant styrene polymer composition.

10. A flame-retardant styrene polymer product, characterized in that, The flame-retardant styrene polymer product is formed from the flame-retardant styrene polymer composition according to any one of claims 1 to 8.

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