A surface flame-retardant and compatibilized glass fiber-reinforced PPE / PS alloy material and its preparation method

Abstract

The present invention belongs to the field of polymer materials, and discloses a surface flame-retardant and compatibilized glass fiber-reinforced PPE / PS alloy material and a preparation method thereof. The alloy material is composed of the following raw materials in parts by weight: bulk flame-retardant MPPE resin: 10-84.98%; polystyrene resin: 5-35%; flame-retardant glass fiber: 10-40%; flame retardant: 0.01-10%; synergistic flame retardant: 0.01-2%; other additives: 0-3%. The PPE / PS alloy material prepared by the present invention has excellent mechanical properties, processing properties and flame retardant properties, and can be used in the fields of household appliances, electrical appliances, automobiles, optical fiber components, etc.

Description

Technical Field

[0001] The present invention relates to the field of polymer materials, and particularly to a surface flame-retardant and compatibilized glass fiber reinforced PPE / PS alloy material and a preparation method thereof. Background Art

[0002] Flame-retardant PPE / PS composites are halogen-free, highly flowable, highly impact-resistant, and highly heat-resistant, and at the same time have a good balance of mechanical and chemical properties, and can be applied to various application scenarios. Its good balance of properties has adjustable heat resistance, good hydrolysis stability, high dielectric strength and optional non-halogenated flame retardants in low specific gravity materials. These characteristics make flame-retardant PPE / PS composites an ideal material for use in multiple fields such as electronic and electrical components, charger housings, automotive battery boxes, sockets, junction boxes, fuses, relay boxes, connectors, coil spools, switch relays, integrated circuit board brackets, etc., to meet the requirements of various specific applications.

[0003] Flame-retardant compatibilized glass fiber is a material that improves the flame-retardant properties and mechanical properties of glass fiber reinforced polymers by adding flame retardants and compatibilizers; this material is usually used to improve the thermal stability and mechanical strength of polymer materials while maintaining the flame-retardant properties of the materials to meet the requirements of specific applications. Flame-retardant compatibilized glass fiber is used to prepare lightweight and thin-walled parts to replace materials such as steel and engineering plastics; this material has the advantages of low density, good heat and creep resistance, and high cost performance, making it occupy an important position in various industrial applications.

[0004] Chinese Patent CN202310134159.1 provides a low-temperature resistant PPO / PS material suitable for energy batteries and its preparation method. This PPO / PS material has the advantages of low-temperature falling ball resistance, prevention of freezing-drop cracking, high flame retardancy, and low density. When applied to the plastic housing of the energy battery industry, it has excellent discoloration resistance during water immersion charging and discharging, enabling it to replace existing flame-retardant ABS and PC / ABS materials; it provides a new direction for the new application of recycled polystyrene resin, with good economic and environmental benefits. Chinese Patent Application No.: CN202011522160.4 provides a flame-retardant high-rigidity PS / PPE composite material, its preparation method and application. The provided flame-retardant high-rigidity PS / PPE composite material synergistically enhances the effect of continuous long glass fibers with specific flame-retardant synergists and flame retardants, and regulates the glass fiber retention length D90, greatly improving the flame retardancy of the material. The flame retardancy grade can reach above 5VB under relatively thin thickness conditions; Chinese Patent 202310236116.4 proposes a surface flame-retardant compatibilized glass fiber reinforced nylon composite material and its preparation method. The interfacial flame-retardant compatibilizer is grafted onto the surface of glass fibers to prepare surface flame-retardant compatibilized glass fibers; then the prepared surface flame-retardant compatibilized glass fibers are mixed with nylon, flame retardants, and additives, etc., and extruded and granulated, and injection molded to obtain a flame-retardant compatibilized glass fiber reinforced nylon composite material. Currently, the preparation methods of the disclosed patents for flame-retardant PPE / PS alloys are mainly achieved through physical blending methods. This method usually requires a high addition amount of flame retardants to achieve flame retardant performance. The interfacial flame-retardant compatibilization technology has been less studied in the preparation of flame-retardant PPE / PS alloy materials. The interfacial flame-retardant compatibilization technology can solve the "wicking effect" brought by glass fibers and the technical problems of poor flame retardancy and mechanical properties of PPE / PS alloy materials, which is of great significance for the preparation of high-performance PPE / PS alloy materials. Summary of the Invention

[0005] The purpose of the present invention is to provide a surface flame-retardant compatibilized glass fiber reinforced PPE / PS alloy material, its preparation method and application. Through formula design, a PPE / PS alloy material is prepared, and the PPE / PS alloy material prepared by this method takes into account both flame retardant performance and mechanical properties, and is used in fields such as home appliances, electrical appliances, automobiles, and optical fiber components.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A surface flame-retardant compatibilized glass fiber reinforced PPE / PS alloy material is prepared from the following raw materials by weight percentage:

[0008] Matrix flame-retardant MPPE resin 2 - 84.98%;

[0009] Polystyrene resin 5 - 35%;

[0010] Flame retardant glass fiber: 10 - 40%;

[0011] Modified flame retardant: 0.01 - 10%;

[0012] Synergistic flame retardant: 0.01 - 2%;

[0013] Auxiliary agent: 0 - 3%.

[0014] The described bulk flame - retardant MPPE resin is obtained by functional modification of PPE resin. The weight - average molecular weight of PPE resin is 20,000 - 60,000, and the melt flow rate (test conditions: 280 °C, 5 kg) is 0.5 - 30 g / 10 min. The functional modification of PPE is prepared in two steps: First, carboxylated modified PPE resin is prepared by the reaction of butyl lithium and carbon dioxide in an anhydrous toluene solvent; second, the carboxylated modified PPE resin further reacts with epoxy phenyl phosphate to prepare the bulk flame - retardant MPPE resin. The structural formula is as follows:

[0015]

[0016] The described polystyrene resin is selected from one or more of high - impact polystyrene, general polystyrene, and SBS resin. Density: 1.04 - 1.06 g / cm3, refractive index: 1.5 - 1.7, weight - average molecular mass: 50,000 - 200,000. Preferably, it is high - impact polystyrene HIPS.

[0017] The described flame - retardant glass fiber has an alkali content of <0.8% by mass percentage, a bulk density of 0.6 - 0.8 g / cm3, a single - filament fiber diameter of 7 - 13 μm, a chopped length of 2 - 5 mm, a moisture content of ≤0.05% by mass percentage. The glass fiber surface is sized by spraying an epoxy phosphate solution on the glass fiber surface, and the sizing agent mass fraction >0.3%. The mass fraction of the flame retardant in the bio - based epoxy phosphate solution is 1% - 10%. Part of the monomers of the epoxy phosphate are sourced from biomass conversion, belonging to a kind of bio - based material. The structural formula is as follows:

[0018]

[0019] The preparation method of the described flame - retardant glass fiber includes the following steps:

[0020] (1) Immerse the glass fiber in a mixed solution composed of an aqueous solution of a silane coupling agent and ethylene glycol. The silane coupling agent is an amino silane. The mass fraction of the silane coupling agent in the mixed solution is 15 - 25%. Adjust the solution pH and perform silane coupling agent modification treatment to obtain silane coupling agent - modified glass fiber;

[0021] (2) Immerse the silane coupling agent - modified glass fiber in an epoxy phosphate solution for modification treatment, where the mass fraction of the bio - based epoxy phosphate is 0.7 - 1.5%, the solvent is selected from tetrahydrofuran, diethyl ether, acetone or methyl ethyl ketone, the temperature is 50 - 100 °C, and the time is 10 - 20 h. After filtration, washing and drying, the flame - retardant glass fiber is obtained.

[0022] The modified flame retardant is a halogen - free phosphorus - containing flame retardant, selected from one or more of triphenyl phosphate, tricresyl phosphate, tolyldiphenyl phosphate, trisdimethylphenyl phosphate, tris(2,4,6 - trimethylphenyl) phosphate, tris(2,4 - di - tert - butylphenyl) phosphate, tris(2,6 - di - tert - butylphenyl) phosphate, resorcinol bis(diphenyl phosphate), hydroquinone bis(diphenyl phosphate), bisphenol A - bis(diphenyl phosphate), resorcinol bis(2,6 - di - tert - butylphenyl phosphate) or hydroquinone bis(2,6 - dimethylphenyl phosphate). Preferably, it is bisphenol A bis(diphenyl phosphate).

[0023] The synergistic flame retardant is prepared by surface - coating washed kaolin with epoxy phenyl phosphate; the epoxy phenyl phosphate coats the surface of the washed kaolin by means of chemical bonds; the structural formula of the epoxy phenyl phosphate is as follows:

[0024] .

[0025] The preparation method of the synergistic flame retardant includes the following steps:

[0026] (1) Add washed kaolin to deionized water and stir ultrasonically to obtain a washed kaolin dispersion.

[0027] (2) Dissolve epoxy phenyl phosphate in absolute ethanol to obtain an epoxy phenyl phosphate - ethanol solution, and then, under stirring conditions, add the epoxy phenyl phosphate - ethanol solution to the washed kaolin dispersion, heat up to 50 - 80 °C and react for 0.5 - 4 h, then cool to room temperature to obtain a slurry.

[0028] (3) Filter the white slurry to obtain a filter cake, wash and dry it to obtain the synergistic flame retardant.

[0029] The auxiliary agent can be one or more of antioxidant, lubricant and colorant.

[0030] The preparation method of the above - mentioned surface - flame - retardant and compatibilizing glass fiber - reinforced PPE / PS alloy material includes the following steps:

[0031] (1) Weigh various raw materials after drying according to the formula ratio; mix the bulk flame-retardant MPPE resin, polystyrene resin, modified flame retardant, synergistic flame retardant, and other additives evenly through a high-speed mixer for standby. Weigh the flame-retardant glass fiber according to the ratio for standby.

[0032] (2) Add the mixed raw materials of the bulk flame-retardant MPPE resin, polystyrene resin, modified flame retardant, synergistic flame retardant, and additives through the main feeding port of the twin-screw extruder, and add the flame-retardant glass fiber through the side feeding port of the twin-screw extruder. The mixed raw materials of the additives are added through the main feeding port of the twin-screw extruder, and the flame-retardant glass fiber is added through the side feeding port of the twin-screw extruder. After processes such as melt extrusion, pelletization, and drying, the PPE / PS alloy material is obtained.

[0033] The above PPE / PS alloy material can be applied to fields such as household appliances, electrical appliances, automobiles, and optical fiber components.

[0034] The advantage of this invention is that the PPE / PS alloy material prepared through formula design has excellent mechanical properties and flame-retardant properties. The interfacial flame-retardant compatibilization technology is introduced in the formula design to solve the "wick effect" brought by glass fiber. At the same time, the epoxy phenyl phosphate is used to functionalize and modify the end of the PPE resin to prepare the bulk flame-retardant PPE resin, and the epoxy phenyl phosphate is used to coat the surface of washed kaolin to prepare the synergistic flame retardant. Compared with simple physical blending, the compatibility and uniform distribution of each component in the formula are increased, and the addition amount of the flame retardant can be greatly reduced to achieve the same flame-retardant effect, and more excellent mechanical properties can be obtained. And part of the flame retardants selected in this invention are of bio-based origin and belong to halogen-free flame retardants, and the environmental protection of the flame retardant monomer source and the gas released when the flame retardant is heated or burned is more advantageous.

[0035] The beneficial effects of this invention are as follows:

[0036] The end of the PPE resin in this invention is functionally modified by epoxy phenyl phosphate, making the MPPE have the property of bulk flame retardance, and at the same time increasing the compatibility of MPPE with the flame-retardant glass fiber and the flame retardant, thus increasing the mechanical properties of the alloy material.

[0037] 2) The interfacial flame-retardant compatibilization technology is introduced in the formula design of this invention. The flame-retardant glass fiber is prepared by treating the surface of the glass fiber with epoxy phenyl phosphate. The epoxy phenyl phosphate loaded on the surface of the glass fiber can block the "wick effect" of the glass fiber during the combustion process, thereby increasing the flame-retardant efficiency during the combustion process. In addition, the flame retardant is evenly dispersed in the resin along with the glass fiber, improving the distribution of the glass fiber in the resin and the interfacial bonding force between the glass fiber and the resin. Compared with simple physical blending, the addition amount of the flame retardant can be greatly reduced to achieve the same flame-retardant effect, and the prepared PPE / PS alloy has more excellent mechanical properties.

[0038] 3) The synergistic flame retardant is prepared by coating the surface of washed kaolin with epoxy phenyl phosphate, which can increase the compatibility of the synergistic flame retardant with the resin. The synergistic effect of phenyl phosphate and kaolin further enhances the carbonization effect during the combustion process, and the flame retardant efficiency is effectively improved.

[0039] 4) Some of the monomers of epoxy phenyl phosphate are bio-based and are halogen-free flame retardants. The flame retardant itself and the gases released when heated or burned are more environmentally friendly.

[0040] 5) This invention improves the performance of PPE / PS alloy materials from multiple dimensions such as raw material functional modification and formula design. The prepared PPE / PS alloy material can achieve excellent flame retardant effect with a small amount of flame retardant added, and obtains excellent mechanical properties, processing properties and flame retardant properties.

[0041] The above beneficial effects achieve excellent mechanical properties, processing properties and flame retardant properties of the PPE / PS alloy material. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and intentions to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] The following materials are used in the examples and comparative examples of the present invention, but are not limited to the following materials:

[0044] The main body is flame-retardant MPPE resin, homemade;

[0045] HIPS, brand HP825T, produced by Formosa Chemicals (Ningbo) Co., Ltd.

[0046] PPE, brand LXN040, produced by Nantong Xingchen Synthetic Materials Co., Ltd.

[0047] Flame retardant glass fiber, homemade;

[0048] Glass fiber, brand ECS306HR, produced by Chongqing International Composite Materials Co., Ltd.

[0049] Flame retardant BDP, brand WSFR-BDP, produced by Zhejiang Wansheng Co., Ltd.

[0050] Synergistic flame retardant, homemade;

[0051] Washed kaolin, trade name HG90, produced by KaMin, USA;

[0052] Processing aid, brand LYSI-100E, produced by Chengdu Silike Technology Co., Ltd.

[0053] Antioxidant 1010, with the brand number YFK - 1010, is produced by Yingkou Fengguang New Materials Co., Ltd.;

[0054] Antioxidant 9228, with the brand number DOVERPHOS S 9228, is produced by Dover Chemical Corporation;

[0055] Color masterbatch, with the brand number XP6581A, is produced by CABOT in the United States;

[0056] In the embodiment of the present invention,

[0057] The described bulk flame - retardant MPPE resin is obtained by functional modification of PPE resin. The weight - average molecular weight of PPE resin is 20,000 - 60,000, and the melt flow rate (test conditions: 280 °C, 5 kg) is 0.5 - 30 g / 10 min. The functional modification of PPE is prepared in two steps: First, carboxylated modified PPE resin is prepared by the reaction of butyl lithium and carbon dioxide in an anhydrous toluene solvent; Second, the carboxylated modified PPE resin further reacts with epoxy phenyl phosphate to prepare the bulk flame - retardant MPPE resin, and the structural formula is as follows:

[0058]

[0059] The preparation method of the described flame - retardant glass fiber includes the following steps:

[0060] (1) Immerse the glass fiber in a mixed solution composed of an aqueous solution of a silane coupling agent and ethylene glycol. The silane coupling agent is an amino silane. The mass fraction of the silane coupling agent in the mixed solution is 15 - 25%. Adjust the pH of the solution and perform silane coupling agent modification treatment to obtain silane coupling agent - modified glass fiber;

[0061] (2) Immerse the silane coupling agent - modified glass fiber in an epoxy phosphate solution for modification treatment. The mass fraction of the bio - based epoxy phosphate is 0.7 - 1.5%. The solvent is selected from tetrahydrofuran, ether, acetone or butanone, the temperature is 50 - 100 °C, and the time is 10 - 20 h. After filtration, washing and drying, the flame - retardant glass fiber is obtained.

[0062] The preparation method of the described synergistic flame - retardant includes the following steps:

[0063] (1) Add washed kaolin into deionized water and stir ultrasonically to obtain a washed kaolin dispersion;

[0064] (2) Dissolve epoxy phenyl phosphate in absolute ethanol to obtain an epoxy phenyl phosphate-ethanol solution. Then, under stirring conditions, add the epoxy phenyl phosphate-ethanol solution to the washed kaolin dispersion, heat up to 50 - 80 °C and react for 0.5 - 4 h, and then cool to room temperature to obtain a slurry;

[0065] (3) Filter the white slurry to obtain a filter cake, wash and dry it to obtain the synergistic flame retardant.

[0066] Preparation methods of Examples 1 - 6 and Comparative Examples 1 - 6:

[0067] Preparation method of PPE / PS alloy material

[0068] (1) Weigh various dried raw materials according to the formula ratio; mix the bulk flame-retardant MPPE resin, polystyrene resin, modified flame retardant, synergistic flame retardant, and other additives evenly through a high-speed mixer for standby, and weigh the flame-retardant glass fiber according to the ratio for standby;

[0069] (2) Add the mixed raw materials of the bulk flame-retardant MPPE resin, polystyrene resin, modified flame retardant, synergistic flame retardant, and additives through the main feeding port of a twin-screw extruder, and add the flame-retardant glass fiber from the side feeding port of the twin-screw extruder. After processes such as melt extrusion, pelletizing, and drying, the PPE / PS alloy material is obtained.

[0070] Preparation of test specimens of PPE / PS alloy material:

[0071] Dry the above materials in a forced-air drying oven at 120 °C for 4 h, and then injection mold them into standard specimens at an injection temperature of 280 - 330 °C. Condition the prepared mechanical property specimens in a laboratory standard environment (23 °C, 50% RH) for 24 h and then conduct tests.

[0072] Test methods for each performance index:

[0073] Tensile property: According to ISO 527 method, specimen size: 170 mm × 10 mm × 4 mm, test speed 5 mm / min.

[0074] Flexural property: According to ISO 178 method, specimen size: 80 mm × 10 mm × 4 mm, test speed 2 mm / min.

[0075] Notched impact property: According to ISO 179 method, specimen size: 80 mm × 10 mm × 4 mm.

[0076] Heat distortion temperature: According to ISO 75 method, specimen size: 80 mm × 10 mm × 4 mm, test condition: 1.8 MPa.

[0077] Flame retardant performance: According to the UL94 method, the spline size is 127 mm × 12.7 mm × 1.6 mm.

[0078] Table 1: Composition and properties of PPE / PS alloy materials in Examples 1-6 and Comparative Examples 1-6

[0079]

[0080] From the results of the examples and comparative examples in Table 1, it can be seen that the introduction of the bulk flame-retardant PPE resin, flame-retardant glass fiber, and synergistic flame retardant in the formulation design can improve the flame retardant performance and mechanical properties of the PPE / PS alloy material. From Examples 4 and Comparative Examples 4-6, it can be seen that the functionalization treatment of the PPE resin terminal with epoxy phenyl phosphate can effectively increase the flame retardant performance and mechanical properties of the PPE / PS alloy material. At the same time, the flame-retardant glass fiber is helpful for improving the flame retardant performance compared with the conventional glass fiber. The addition amount of the flame retardant in the formulation for achieving the same flame retardant performance is less. This is because the epoxy phenyl phosphate loaded on the glass fiber surface can block the "wick effect" of the glass fiber during combustion, thereby increasing the flame retardant efficiency during combustion. In addition, the improvement of the compatibility given by the surface coating treatment of the glass fiber can increase the mechanical properties of the PPE / PS alloy material. From Examples 1-4 and Comparative Examples 1-4, it can be seen that the synergistic flame retardant can increase the compatibility of the synergistic flame retardant with the resin through the coating of epoxy phenyl phosphate. The synergy of phenyl phosphate and kaolin further enhances the charring effect during combustion, and the flame retardant efficiency is effectively improved. From Examples 1, Example 5, and Example 6, it can be seen that the technical advantages of the present invention are applicable to PPE / PS alloy materials of different grades. The PPE / PS alloy material prepared by the present invention has excellent mechanical properties, processing properties, and flame retardant performance, and can be used in fields such as household appliances, electrical appliances, automobiles, and optical fiber components.

Claims

1. A surface flame retardant compatibilized glass fiber reinforced PPE / PS alloy material, characterized in that: Prepared according to the following raw materials in percentage by weight: Flame retardant MPPE resin 10-84.98%; polystyrene resin 5-35%; flame retardant glass fiber 10-40%; modified flame retardant 0.01-10%; synergistic flame retardant 0.01-2%; additive 0-3%; The bulk flame-retardant MPPE resin is obtained by functionalizing a PPE resin. The PPE resin has a weight-average molecular weight of 20,000-60,000. The test conditions are: 280° C., 5 kg, and a melt flow rate of 0.5-30 g / 10 min. The functionalization of the PPE is prepared in two steps: first, a carboxyl-modified PPE resin is prepared by reacting butyl lithium and carbon dioxide in anhydrous toluene solvent; second, the carboxyl-modified PPE resin is further reacted with epoxyphenyl phosphate to prepare a bulk flame-retardant MPPE resin. The MPPE has the structural formula: ； ； The alkali content of the flame retardant glass fiber is less than 0.8% by mass, and the bulk density is 0.6-0.8 g / cm 3 , monofilament fiber diameter: 7-13μm, short cut length: 2-5mm, moisture content by mass percentage ≤0.05%; The preparation method of the flame retardant glass fiber comprises the following steps: (1) soaking the glass fiber in a mixed solution consisting of a silane coupling agent and an aqueous solution of ethylene glycol, wherein the silane coupling agent is aminosilane and the mass fraction of the silane coupling agent in the mixed solution is 15-25%, adjusting the pH of the solution, and performing a silane coupling agent modification treatment to obtain a silane coupling agent-modified glass fiber; (2) immersing the silane coupling agent modified glass fiber in a bio-based epoxy phosphate solution for modification, wherein the mass fraction of the bio-based epoxy phosphate is 0.7-1.5%, the solvent is selected from tetrahydrofuran, ether, acetone or butanone, the temperature is 50-100°C, the time is 10-20 hours, and the flame retardant glass fiber is obtained after filtering, washing and drying; The bio-based epoxy phosphate monomer is partially derived from biomass conversion and is a bio-based material with the following structural formula: ； The synergistic flame retardant is prepared by coating the surface of washed kaolin with epoxy phenyl phosphate; the epoxy phenyl phosphate coats the surface of the washed kaolin through chemical bonds; wherein the structural formula of the epoxy phenyl phosphate is as follows: 。 2. The surface flame-retardant compatibilized glass fiber reinforced PPE / PS alloy material according to claim 1, characterized in that: The polystyrene resin is selected from one or more of high impact polystyrene, general purpose polystyrene, and SBS resin, with a density of 1.04-1.06 g / cm 3 , refractive index: 1.5-1.7, weight average molecular mass: 50000-200000.

3. The surface flame-retardant compatibilized glass fiber reinforced PPE / PS alloy material according to claim 2, characterized in that: The polystyrene resin is selected from high impact polystyrene.

4. The surface flame-retardant compatibilized glass fiber reinforced PPE / PS alloy material according to claim 1, characterized in that: The modified flame retardant is a halogen-free phosphorus-containing flame retardant, and is selected from one or more of triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, tri(xylyl) phosphate, tris(2,4,6-trimethylphenyl) phosphate, tris(2,4-di-tert-butylphenyl) phosphate, tris(2,6-di-tert-butylphenyl) phosphate, resorcinol bis(diphenyl phosphate), hydroquinone bis(diphenyl phosphate), bisphenol A bis(diphenyl phosphate), resorcinol bis(2,6-di-tert-butylphenyl phosphate) or hydroquinone bis(2,6-dimethylphenyl phosphate).

5. The surface flame-retardant compatibilized glass fiber reinforced PPE / PS alloy material according to claim 1, characterized in that: The modified flame retardant is bisphenol A bis(diphenyl phosphate).

6. The surface flame-retardant compatibilized glass fiber reinforced PPE / PS alloy material according to claim 1, characterized in that: The preparation method of the synergistic flame retardant comprises the following steps: (1) adding water-washed kaolin into deionized water and stirring with ultrasonic waves to obtain a water-washed kaolin dispersion; (2) dissolving epoxy phenyl phosphate in anhydrous ethanol to obtain an epoxy phenyl phosphate-ethanol solution, then adding the epoxy phenyl phosphate-ethanol solution to the water-washed kaolin dispersion under stirring, heating to 50-80° C. for reaction for 0.5-4 h, and then cooling to room temperature to obtain a slurry; (3) Filtering the slurry to obtain a filter cake, washing and drying the filter cake to obtain the synergistic flame retardant.

7. The surface flame-retardant compatibilized glass fiber reinforced PPE / PS alloy material according to claim 1, characterized in that: The auxiliary agent is one or more of an antioxidant, a lubricant, and a colorant.

8. The method for preparing the surface flame-retardant compatibilized glass fiber reinforced PPE / PS alloy material according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Weigh the dried raw materials according to the formula ratio; mix the flame retardant MPPE resin, polystyrene resin, modified flame retardant, synergistic flame retardant and additives uniformly with a high-speed mixer and set aside; weigh the flame retardant glass fiber according to the ratio and set aside; (2) The flame retardant MPPE resin, polystyrene resin, modified flame retardant, synergistic flame retardant and auxiliary agent mixed raw materials are added through the main feeding port of the twin-screw extruder, and the flame retardant glass fiber is added from the side feeding port of the twin-screw extruder. After the melt extrusion, granulation and drying process, the PPE / PS alloy material is obtained.

9. The surface flame-retardant compatibilized glass fiber reinforced PPE / PS alloy material according to any one of claims 1 to 7, characterized in that: The PPE / PS alloy material is used in the fields of electrical appliances, automobiles, and optical fiber components.

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