Special flame-retardant PC / ABS alloy material for high-heat-resistance power battery accessories and preparation method thereof

Abstract

The invention provides a special flame-retardant PC / ABS alloy material for a high-heat-resistant power battery accessory and a preparation method of the special flame-retardant PC / ABS alloy material, and relates to the technical field of high polymer materials. According to the invention, PC and ABS with specific indexes are selected to improve the strength and heat resistance of the basic resin. Three combustion improvers with different flame-retardant mechanisms and an activated 4A molecular sieve are used as auxiliary flame-retardant synergists, so that the effect of the auxiliaries is exerted to the greatest extent, the total addition amount is reduced, and the loss of material performance is reduced; the heat resistance of the material is enhanced by matching the organic polymer heat-resistant agent and the inorganic nanoparticles, and the heat deformation temperature and the vicat softening point are improved by a relatively low addition amount. Compared with a general grafting toughening agent and an MBS toughening agent, the impact-resistant toughening agent with a core-shell structure of an organic silicon system is selected, so that the low-temperature impact resistance and the weather resistance are more excellent, the synergistic effect on a flame-retardant system is good, and the material is endowed with a good appearance.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a flame-retardant PC / ABS alloy material specially used for high-heat-resistant power battery accessories and a preparation method thereof. Background Art

[0002] With the rapid development of new energy technologies and the rise of electric vehicles, the demand for power batteries has increased. As key protective components of new energy battery packs, the housing, tray, upper and lower brackets, and cover plates have very high requirements for temperature resistance, flame retardancy, and stability. Currently, the flexural strength of the materials used in the manufacture of related products on the market must exceed 90MPa, the flexural modulus must reach 2500MPa, and the notched impact strength must exceed 60Kj / m 2 , and the flame retardant performance of the material must reach 1.6mmV0 or above. And with the development of the times, people pay more and more attention to the safety performance of vehicles. Materials with balanced performance in all aspects are the basis for manufacturing upgrades.

[0003] PC / ABS alloy, made primarily from PC (polycarbonate) and ABS (acrylonitrile-butadiene-styrene copolymer), is an important engineering plastic alloy. This material not only exhibits excellent moldability, but also good low-temperature impact resistance, a high heat distortion temperature, and light stability. Compared to PC, PC / ABS alloy has lower melt viscosity, better processability, and higher impact strength. Compared to ABS, its heat distortion temperature and mechanical properties are improved. PC / ABS has poor flame retardancy, which is enhanced by the addition of flame retardants. However, the large amount of flame retardant added significantly impacts the overall performance of the material. Furthermore, the compatibility between PC and ABS is poor, and the ester groups and double bonds in the mixture degrade when exposed to humid and hot environments, severely impacting the material's long-term stability. Balancing the stability, flame retardancy, and heat resistance of flame-retardant PC / ABS alloys has always been a key challenge in developing high-quality materials.

[0004] In the existing technology, patent CN101974216A uses a mixture of PC pellets and PC powder as PC masterbatch to improve the processing performance of PC and ABS; during the extrusion process, flame retardants and other additives are added to the screw extruder in the form of side feeding through the second feed port to avoid the high-temperature degradation problem of flame retardants and other additives due to excessive residence time at high temperatures. However, the patent formula uses two relatively simple phosphate organic flame retardants, does not use a special precision liquid filling pump, and lacks heat-resistant additives. Therefore, the heat deformation temperature of its product is only 122-124°C, and the flame retardant performance does not reflect the data when it is less than 2.0mm. In addition, its maximum impact performance is only 39Kj / m 2, the comprehensive performance is not suitable for power battery accessory materials. In patent CN116694056A, a silane coupling agent is used to graft the phosphaphenanthrene flame retardant on the surface of the reinforcing talcum powder filler, which improves the heat resistance temperature of the phosphaphenanthrene flame retardant. Although the final PC / ABS alloy product has a high bending modulus and heat deformation temperature, the impact strength of the material is only a dozen. In patent CN101735585A, bisphenol A-bis(diphenyl phosphate) is used alone as a flame retardant. Only when the addition amount is greater than 18% can it reach 1.6mmV0. In addition, there is no mention of measures to improve the heat resistance of the material. In patent CN112029254A, by adding PE wax, PE wax can migrate to the surface of the material, forming a "barrier" between the halogen-free flame retardant PC / ABS material matrix and the humid and hot environment, thereby reducing the impact of the humid and hot environment on the halogen-free flame retardant PC / ABS matrix, and improving the humid and hot aging resistance of the halogen-free flame retardant PC / ABS alloy material. However, adding too much small-molecule PE wax can negatively impact the material's mechanical properties and precipitation. Patent CN113527858A achieves antibacterial properties in PC / ABS alloys by adding an inorganic metal ion antibacterial and mildew-proof agent. However, the loss of toughness is compensated by adding a large amount of toughening agent, which alone results in a decrease in the heat deformation temperature. Ultimately, the material fails to meet the performance requirements of power battery components.

[0005] In view of the above-mentioned defects of the existing PC / ABS alloy materials, there is an urgent need for a high-strength, high-toughness, high-heat-resistant flame-retardant PC / ABS alloy material that is suitable for power battery accessories, has low production cost, excellent processing performance, and is suitable for industrial production. Summary of the Invention

[0006] The purpose of the present invention is to provide a flame-retardant PC / ABS alloy material specially used for high-heat-resistant power battery accessories and a preparation method thereof, so as to solve the problem of poor performance of PC / ABS alloy.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A flame-retardant PC / ABS alloy material specially designed for high-heat-resistant power battery accessories, comprising the following components by weight percentage:

[0009] Compound flame retardant emulsion: 10-15%; synergist: 0.2-1%; toughening agent: 4-8%; stabilizer: 1-4%; lubricant: 0.1-0.5%; anti-dripping agent: 0.2-0.4%; compound heat resistant agent: 2-6%; compound antioxidant: 0.2-0.5%; ABS resin: 8-15%; PC resin: balance.

[0010] As a further solution of the present invention, the compound flame retardant emulsion is composed of a phosphorus-based liquid flame retardant, a halogen-free flame retardant, and liquid silicone as a reinforcing agent in a weight ratio of 30:20:1.

[0011] Furthermore, the phosphorus-based liquid flame retardant includes bisphenol A-bis(diphenyl phosphate) (BDP); and the halogen-free flame retardant includes 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO, CAS No.: 126227-53-4).

[0012] Different flame retardants have different mechanisms, and their respective advantages and effects can be brought into play through mixing to achieve a synergistic improvement effect. The flame retardant BDP exerts its flame retardant effect in the condensed phase, helping to carbonize the polymer and reduce the fuel supply to the material area, thereby reducing the flame temperature. The flame retardant DOPO has high volatility and has a greater advantage in gas-phase flame retardancy. The flame retardant mechanism of silicone flame retardants is that siloxanes migrate from the polymer matrix to the surface of the residual carbon during combustion, preventing the escape of combustible gases, isolating oxygen, and inhibiting further degradation of the polymer. Secondly, siloxanes will participate in the carbonization process of PC, affecting the decarboxylation reaction and rearrangement reaction of PC. In addition, because the organosiloxane flame retardant contains flexible chain segments, it plays a role in rubber toughening in the matrix. Therefore, after adding organosiloxanes, the notched impact strength and elongation at break of the material will be improved. In summary, by using DOPO and BDP as the primary flame retardants, supplemented by silicone flame retardants, they work synergistically during the volatilization and carbonization processes of polymer combustion, thereby achieving a comprehensive reduction in flame retardant usage and minimizing the loss of mixture performance. Furthermore, the fully heated mixture of the three flame retardants is added to the twin-screw extruder using a precision gear metering pump, reducing losses and fluctuations and ensuring the stability of the alloy's flame retardant properties. Furthermore, the toughening agent selected is a core-shell copolymer composed of methyl methacrylate, acrylate, and silicone. The silicone also plays a synergistic flame retardant role, further reducing the overall flame retardant dosage.

[0013] As a further solution of the present invention, the synergist is activated 4A molecular sieve powder with a particle size of 2-4 μm and a pore size of 0.4 nm.

[0014] Micron-grade activated 4A molecular sieve is selected as an auxiliary flame retardant synergist. Adding a small amount of 4A molecular sieve can catalyze the decomposition reaction of the flame retardant and help the flame retardant interfere with the free radical chain reaction during the combustion process.

[0015] As a further solution of the present invention, the toughening agent is a core-shell copolymer composed of methyl methacrylate, acrylate and silicone.

[0016] As a further embodiment of the present invention, the stabilizer is a styrene-acrylonitrile-glycidyl methacrylate terpolymer.

[0017] As a further embodiment of the present invention, the lubricant is pentaerythritol stearate (PETS).

[0018] As a further solution of the present invention, the anti-dripping agent is coated PTFE (polytetrafluoroethylene).

[0019] Furthermore, the preparation method of the coated PTFE comprises the following steps:

[0020] S1. Tetrabutyl titanate, ethanol, and deionized water were mixed in a volume ratio of 1:4:1, hydrochloric acid was added to adjust the pH to 2-3, and stirred at 25-40 ° C until a transparent sol was formed, and allowed to stand for aging for 1-2h to obtain a sol system;

[0021] S2. Add PTFE powder to ethanol and ultrasonically disperse for 20-40 minutes to obtain a uniform PTFE suspension with a solid content of 8-12%; add the PTFE suspension to the sol system, stir and react for 20-40 minutes, then add PEG (polyethylene glycol), adjust the pH to 6-7, stir and react at 40-60°C for 8-12 hours, centrifuge, wash, dry, and calcine to obtain coated PTFE.

[0022] The amount of PEG used is 0.05-0.1% of the PTFE suspension.

[0023] The PTFE powder has a particle size of 1-50 μm and a molecular weight of >10 6 g / mol.

[0024] PTFE is coated with the polar inorganic material TiO2, which significantly improves the compatibility between non-polar PTFE and polar matrix resin, reduces interface defects, and enhances the performance of the composite material. At the same time, the TiO2 coating layer acts as a thermal barrier, delaying the thermal decomposition of PTFE and synergistically improving the flame retardancy of the material.

[0025] As a further solution of the present invention, the compound heat-resistant grade is composed of a polymer heat-resistant agent and an inorganic nano heat-resistant material in a weight ratio of 8:1.

[0026] Furthermore, the polymer heat-resistant agent is a copolymer of styrene, N-phenylmaleimide and maleic anhydride (SMI); the inorganic nano heat-resistant material is a hydrophobic and oleophilic nano-silica with a specific surface area of more than 200m 2 / g, pH value 6.5-8.0, filling density >200g / l.

[0027] In PC / ABS alloys, ABS has low heat resistance. Currently, N-phenylmaleimide heat-resistant additives are added to improve its heat resistance. Inorganic rigid particles can also enhance heat resistance in polymer additives. This invention utilizes the latest imported additive, MS-NB (a copolymer of styrene-N-phenylmaleimide and maleic anhydride), in combination with nano-precipitated silica to achieve a lower addition amount and greater performance. Furthermore, because MS-NB contains the same components and high polar groups as the matrix, it can enhance the compatibility and toughness of the PC / ABS alloy.

[0028] As a further solution of the present invention, the compound antioxidant is composed of antioxidant 626 and antioxidant 1076 in a weight ratio of 1:1.

[0029] As a further embodiment of the present invention, the ABS resin has an AN (acrylonitrile) content of ≥20% and a melt index of 18-25 g / 10 min (220° C., 10 kg).

[0030] As a further embodiment of the present invention, the PC resin is high-viscosity bisphenol A polycarbonate with an average weight-average molecular weight of 30,000-40,000 and a melt index of 8-12 g / 10 min (300° C., 1.2 kg).

[0031] By selecting PC and ABS with specific specifications, the base resin's strength and heat resistance are enhanced. For example, starting with a low-viscosity, high-molecular-weight PC grade ensures the alloy's basic toughness and modulus. Selecting ABS with a high AN content and high fluidity not only ensures the alloy's processing fluidity, but also, due to the high polarity of AN, enhances the molecular chain interaction strength within the alloy mixture, ensuring basic heat resistance.

[0032] A method for preparing a flame-retardant PC / ABS alloy material specially used for high-heat-resistant power battery accessories comprises the following steps:

[0033] After mixing the synergist, toughening agent, stabilizer, lubricant, anti-dripping agent, compound heat-resistant agent, compound antioxidant, ABS resin and PC resin, add them to the main feeding port of the twin-screw extruder. At the same time, the compound flame retardant emulsion is added from the middle of the screw through a liquid filling pump, extruded into strands and granulated, dried and dehumidified, and finally the PC / ABS alloy material is obtained.

[0034] As a further embodiment of the present invention, the aspect ratio of the twin-screw extruder is 40:1 or 44:1; the section temperatures of the extruder are: 210-220°C, 220-230°C, 230-240°C, 235-245°C, 240-250°C, 240-250°C, 240-250°C, 240-250°C, 240-250°C, 250-255°C; and the vacuum degree is set to (-0.10)-(-0.07) MPa.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention improves the strength and heat resistance of the base resin by selecting PC and ABS with specific indicators. Three flame retardant agents with different flame retardant mechanisms and activated 4A molecular sieve are used as auxiliary flame retardant synergists to maximize the effect of the additives, reduce the overall addition amount, and reduce the loss of material performance; and in the preparation method, the three flame retardants are mixed by heating and filled with a precise gear metering pump to ensure the stability of the performance. Organic polymer heat-resistant agents and inorganic nanoparticles are used to enhance the heat resistance of the material, and the heat deformation temperature and Vicat softening point are increased with a lower addition amount. The core-shell structure impact toughener of the organosilicon system is selected. Compared with the general graft toughener and MBS toughener, it has better low-temperature impact resistance and weather resistance, has good synergy with the flame retardant system, and gives the material a good appearance.

[0037] 2. The PC / ABS alloy material prepared by the present invention has excellent flame retardancy, heat resistance and mechanical properties, is suitable for accessories materials of power batteries, and has low production cost, excellent processing performance, and is suitable for industrial production. DETAILED DESCRIPTION

[0038] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0039] The terms used in the examples of this application are for the purpose of describing specific implementation rules only and are not intended to limit this application. The singular forms "a", "an", "the" and "the" used in the implementation rules of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0040] It should be understood that in the various embodiments of the present application, the size of the serial number of each process does not mean the order of execution. Some or all steps can be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the implementation regulations of this application.

[0041] The weights of the relevant components mentioned in the examples of this application may not only refer to the specific content of each component, but also represent the weight ratio between the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the examples of this application, it is within the scope disclosed in the examples of this application. Specifically, the mass described in the examples of this application may be a mass unit known in the chemical industry, such as μg, mg, g, kg, etc.

[0042] Unless otherwise defined, all technical terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0043] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0044] The following is further described with reference to specific embodiments.

[0045] Preparation Example 1

[0046] This preparation example provides a method for preparing a compound flame retardant emulsion, comprising the following steps:

[0047] Using liquid flame retardant (BDP) as the matrix, after maintaining a constant temperature at 60°C, add halogen-free flame retardant (DOPO) and liquid silicone (Dow ADDITIVE 40-001) in a mass ratio of BDP, DOPO, and liquid silicone of 30:20:1; stir thoroughly and keep warm for later use.

[0048] Preparation Example 2

[0049] This preparation example provides a method for preparing an anti-dripping agent (coated PTFE), comprising the following steps:

[0050] S1. Tetrabutyl titanate, ethanol, and deionized water were mixed in a volume ratio of 1:4:1, hydrochloric acid was added to adjust the pH to 2.5, and stirred at 35 ° C until a transparent sol was formed. The mixture was allowed to stand for aging for 1.5 h to obtain a sol system;

[0051] S2. The particle size is 1-50 μm and the molecular weight is 10 7 PTFE powder (1000 g / mol) was added to ethanol and ultrasonically dispersed for 30 minutes to obtain a uniform PTFE suspension with a solid content of 10%. The PTFE suspension was added to the sol system and stirred for 30 minutes. PEG (0.08% by weight of the PTFE suspension) was then added, and the pH was adjusted to 66.5. The mixture was stirred at 50°C for 10 hours, then centrifuged, washed, and dried. The mixture was then calcined at 300°C for 2 hours to obtain the coated PTFE.

[0052] Preparation Example 3

[0053] This preparation example provides a method for preparing a composite heat-resistant agent, comprising the following steps:

[0054] A copolymer of styrene, N-phenylmaleimide and maleic anhydride (DENKAIP MS-NB, Japan Electric Chemical) and hydrophobic and oleophilic nano-silica (Wacker H2000, Germany) were weighed in a weight ratio of 8:1 and stirred and mixed to obtain a composite heat-resistant agent.

[0055] Preparation Example 4

[0056] This preparation example provides a method for preparing a compound antioxidant, comprising the following steps:

[0057] Antioxidant 626 and antioxidant 1076 were weighed in a weight ratio of 1:1, stirred and mixed uniformly to obtain a compound antioxidant.

[0058] Example 1

[0059] A flame-retardant PC / ABS alloy material specially designed for high-heat-resistant power battery accessories, comprising the following components by weight percentage:

[0060] Compound flame retardant emulsion (prepared in Preparation Example 1): 10%; synergist (activated 4A molecular sieve powder): 0.5%; toughening agent (core-shell structure copolymer composed of methyl methacrylate, acrylate and silicone, Japan Mitsubishi Rayon S2001): 6%; stabilizer (styrene-acrylonitrile-glycidyl methacrylate terpolymer): 2%; lubricant (PETS): 0.3%; anti-dripping agent (prepared in Preparation Example 2): 0.2%; compound heat-resistant agent (prepared in Preparation Example 3): 2%; compound antioxidant (prepared in Preparation Example 4): 0.4%; ABS resin: 9%; PC resin: 69.6% (balance).

[0061] The preparation method of the PC / ABS alloy material comprises the following steps:

[0062] The main ingredients of PC resin and ABS resin are dried and dehydrated to make the water content less than 0.02%; then mixed evenly with synergist, toughening agent, stabilizer, lubricant, anti-dripping agent, compound heat-resistant agent and compound antioxidant, and added to the main feeding port of the twin-screw extruder. At the same time, the compound flame retardant emulsion is added from the middle of the screw through the liquid filling pump. The length-diameter ratio of the twin-screw extruder is 40:1; the section temperatures of the extruder are: 210-220℃, 220- 230℃, 230-240℃, 235-245℃, 240-250℃, 240-250℃, 240-250℃, 240-250℃, 240-250℃, 250-255℃; the vacuum degree is set to (-0.10)-(-0.07)MPa; the mixed material is extruded from the extruder die head and cooled in a water tank, dehumidified by an air knife, pelletized and screened, and dried and dehydrated to obtain PC / ABS alloy material particles.

[0063] Examples 2-8

[0064] Examples 2-8 respectively provide flame-retardant PC / ABS alloy materials for high-heat-resistant power battery accessories. The components and weight percentages of each example are summarized in Table 2;

[0065] The preparation method of the PC / ABS alloy material in each embodiment is consistent with that in Example 1.

[0066] The components and weight percentages in Examples 1-8 are summarized in Table 1.

[0067] Table 1

[0068]

[0069] Comparative Examples 1-9

[0070] Comparative Examples 1-9 provide PC / ABS alloy materials, wherein in Comparative Examples 1 and 6, the flame retardant is replaced by DOPO; in Comparative Examples 2 and 7, the flame retardant is replaced by BDP; in Comparative Example 8, the anti-dripping agent is replaced by a particle size of 1-50 μm and a molecular weight of 10 7 g / mol PTFE powder, the specific comparative example components and weight percentages are summarized in Table 2;

[0071] The preparation methods of the PC / ABS alloy materials in each comparative example are consistent with those in Example 1.

[0072] Table 2

[0073]

[0074]

[0075] The PC / ABS alloy materials prepared in Examples 1-8 and Comparative Examples 1-9 were subjected to performance tests using the following test methods and standards:

[0076] (1) The melt flow rate was tested according to GB / T3682 (260°C / 5kg).

[0077] (2) Density shall be tested in accordance with GB / T1033.

[0078] (3) Izod notched impact strength (IZOD) was tested in accordance with GB / T 1843. The test specimen dimensions were: 80 mm long, 10 mm wide, and 4 mm thick, with an A-notch and a notch depth of 2 mm. The test pendulum was 5.5 J. Conditioning was performed for 48 hours in accordance with GB / T 2918 at a temperature of 23°C and a humidity of 50%.

[0079] (4) Flexural properties were tested in accordance with GB / T9341. The test specimen dimensions were: 80 mm long, 10 mm wide, and 4 mm thick. The specific test method employed a span of 64 mm and a downward pressure rate of 2 mm / min. Conditioning was performed for 48 hours in accordance with GB / T2918 at a temperature of 23°C and a humidity of 50%.

[0080] (5) The tensile properties were tested in accordance with GB / T1040. The actual test specimen dimensions were: dumbbell-shaped, 154 mm in total length, 80 mm in length, 10 mm in width, and 4 mm in thickness for the effective test data portion. The specific test methods were as follows: the tensile strength and elongation at break were tested in accordance with GB / T1040, with a tensile speed of 50 mm / min and a gauge length of 50 mm. The 48-minute test state adjustment was performed in accordance with GB / T2918 at a temperature of 23°C and a humidity of 50%.

[0081] (6) Test the heat deformation temperature (HDT) according to GB / T1634 standard.

[0082] (7) Vicat softening temperature is tested according to GB / T1633 standard. (8) Flame retardancy is tested according to UL94 standard.

[0083] The test results are summarized in Tables 3 and 4.

[0084] Table 3

[0085]

[0086] Table 4

[0087]

[0088]

[0089] It can be seen from the test results in Table 3 and Table 4 that the PC / ABS alloy materials prepared using the formula provided by the present invention in Examples 1-8 can achieve a flame retardant performance of 1.6 mmV0, while the amount of flame retardant added is relatively small; the notched impact strength of each alloy material is greater than 50 kj / m 2 ;

[0090] Comparative Examples 1 and 2 use conventional PC / ABS alloy material formulations, and the resulting alloy materials fail to achieve a flame retardant performance of 1.6 mm V0. Comparative Example 3 shows that even when the composite flame retardant emulsion prepared in Preparation Example 1 of the present invention is used, a certain addition amount still needs to be ensured. Comparative Examples 4-5 show that the ratio of PC to ABS in the alloy must be kept within a reasonable range to ensure the performance of the material. At the same time, adding more composite flame retardant emulsion will also reduce the performance of the material. Comparative Example 1, Comparative Example 6, and Comparative Example 7, only replacing the composite flame retardant emulsion with DOPO or BDP lacks synergistic effect in polymer combustion, resulting in relatively poor flame retardant effect. In addition, Comparative Example 1 and Comparative Example 9, the synergist micron-sized activated 4A molecular sieve plays a certain role in catalyzing the decomposition of the composite flame retardant liquid. Comparative Example 1 and Comparative Example 8, when the coated PTFE used as an anti-dripping agent is replaced with PTFE powder, the lack of a thermal barrier causes the thermal decomposition of the TiO2-free PTFE to be relatively rapid, and the compatibility of PTFE with the matrix resin is poor, resulting in slightly inferior performance of the alloy material.

[0091] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0092] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A flame-retardant PC / ABS alloy material specially made for high heat-resistant power battery accessories, characterized in that: According to weight percentage, it includes the following components: Compound flame retardant emulsion: 10-15%; Synergist: 0.2-1%; Toughener: 4-8%; Stabilizer: 1-4%; Lubricant: 0.1-0.5%; Anti-dripping agent: 0.2-0.4%; compound heat-resistant agent: 2-6%; compound antioxidant: 0.2-0.5%; ABS resin: 8-15%; PC resin: balance.

2. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 1, characterized in that: The compound flame retardant emulsion is composed of a phosphorus-based liquid flame retardant, a halogen-free flame retardant, and liquid organic silicon as a reinforcing agent in a weight ratio of 30:20:

1.

3. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 2, characterized in that: The phosphorus-based liquid flame retardant includes bisphenol A-bis(diphenyl phosphate); and the halogen-free flame retardant includes 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

4. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 1, characterized in that: The synergist is activated 4A molecular sieve powder with a particle size of 2-4 μm and a pore size of 0.4 nm.

5. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 1, characterized in that: The toughening agent is a core-shell structure copolymer composed of methyl methacrylate, acrylate and silicone; the stabilizer is a styrene-acrylonitrile-glycidyl methacrylate terpolymer; and the lubricant is pentaerythritol stearate.

6. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 1, characterized in that: The anti-dripping agent is coated PTFE, and the preparation method of the coated PTFE comprises the following steps: S1. Tetrabutyl titanate, ethanol, and deionized water were mixed in a volume ratio of 1:4:1, hydrochloric acid was added to adjust the pH to 2-3, stirred at 25-40 ° C until transparent, and allowed to stand for aging to obtain a sol system; S2. A PTFE suspension with a solid content of 8-12% is added to the sol system, stirred and reacted for 20-40 minutes, and then PEG is added to adjust the pH to 6-7. After stirring and reacting at 40-60°C for 8-12 hours, the coated PTFE is obtained by centrifugation, washing, drying, and calcination.

7. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 6, characterized in that: The amount of PEG used is 0.05-0.1% of the PTFE suspension.

8. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 6, characterized in that: The PTFE powder has a particle size of 1-50 μm and a molecular weight of >10 6 g / mol.

9. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 1, characterized in that: The compound heat-resistant grade is composed of a polymer heat-resistant agent and an inorganic nano heat-resistant material in a weight ratio of 8:

1.

10. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 9, characterized in that: The polymer heat-resistant agent is a copolymer of styrene, N-phenylmaleimide and maleic anhydride; the inorganic nano heat-resistant material is hydrophobic and oleophilic nano silicon dioxide with a specific surface area of more than 200m 2 / g, pH value is 6.5-8.0, and filling density is >200g / l.

11. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 1, characterized in that: The compound antioxidant consists of antioxidant 626 and antioxidant 1076 in a weight ratio of 1:

1.

12. The flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 1, characterized in that: The ABS resin has an AN content of ≥20% and a melt index of 18-25 g / 10 min; the PC resin is bisphenol A polycarbonate with an average weight-average molecular weight of 30,000-40,000 and a melt index of 8-12 g / 10 min.

13. A method for preparing a flame-retardant PC / ABS alloy material specially used for high-heat-resistant power battery accessories, used to prepare the PC / ABS alloy material according to claim 1, characterized in that: The following steps are involved: After mixing the synergist, toughening agent, stabilizer, lubricant, anti-dripping agent, compound heat-resistant agent, compound antioxidant, ABS resin and PC resin, add them to the main feeding port of the twin-screw extruder. At the same time, the compound flame retardant emulsion is added from the middle of the screw through a liquid filling pump, extruded into strands and granulated, dried and dehumidified, and finally the PC / ABS alloy material is obtained.

14. The method for preparing a flame-retardant PC / ABS alloy material for high heat-resistant power battery accessories according to claim 13, characterized in that: The aspect ratio of the twin-screw extruder is 40:1 or 44:1; the section temperatures of the extruder are: 210-220°C, 220-230°C, 230-240°C, 235-245°C, 240-250°C, 240-250°C, 240-250°C, 240-250°C, 240-250°C, 250-255°C; and the vacuum degree is set to (-0.10)-(-0.07) MPa.

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