Synergistic reinforced PC / ABS high-flame-retardant material and preparation method thereof

Abstract

The invention belongs to the technical field of PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene) high-flame-retardant materials, and particularly relates to a synergistically reinforced PC / ABS high-flame- The flame-retardant PC / ABS alloy material comprises the following components in parts by mass: 55-65 parts of PC resin, 20-30 parts of ABS resin, 5-10 parts of an intumescent flame retardant IFR and 3-8 parts of layered silicate, the melt flow rate of the PC resin is 10-45 g / 10 min; the melt index of the ABS resin is 15-30 g / 10 min, and the particle size of a rubber phase is 0.5-1.5 microns; the IFR is formed by compounding APP, MEL and PER; the layered silicate is Na-montmorillonite modified by hexadecyl trimethyl ammonium bromide. Compared with the prior art, the invention has the beneficial effects that the prepared synergistically reinforced PC / ABS high-flame-retardant material is light in weight, has higher flame retardant property, mechanical property, corrosion resistance and high-voltage insulativity, and can meet the long-term use requirement of a power battery shell material.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of PC / ABS high flame-retardant materials, and particularly relates to synergistically enhanced PC / ABS high flame-retardant materials and a preparation method thereof. BACKGROUND

[0002] The battery shell is a necessary component of an electric vehicle, which contains high-voltage batteries, electronic components, sensors and connectors, helps to protect the overall structure and safety of the vehicle, and protects the key components from potential external impact and heat. With the acceleration of new energy vehicles to high-voltage (800V platform), long endurance and intelligence, the power battery shell material urgently needs to break through the performance ceiling of the traditional technology system, and the core needs are concentrated in flame retardancy, lightweight, mechanical strength, chemical corrosion resistance and high-voltage insulation, etc.

[0003] Through analysis, the core contradictions and defects of the traditional technology are as follows: 1. Insufficient flame retardant performance. The traditional PC / ABS material relies on bromine flame retardant (addition amount > 20%) to achieve UL94V-0 level, but there are problems such as release of toxic gas during combustion and easy migration failure during long-term use, which does not meet the requirements of EU RoHS and automobile industry environmental protection; and the addition amount of flame retardant is more than 20%, the impact strength of the material decreases by 30%-40%, which affects the mechanical impact resistance of the shell; and ordinary engineering plastics (such as PP, PA) have only UL94HB-V2 level of flame retardant grade, which cannot block the flame spread when the battery is out of control.

[0004] 2. Difficulty in achieving lightweight and mechanical strength. The metal shell (such as aluminum alloy) has a density of 30%-40% of the total weight of the battery pack, which seriously restricts the endurance mileage; and when the wall thickness of the existing plastic shell is reduced to ≤1.2mm, the rigidity decreases significantly, and it is easy to deform beyond the standard under extreme extrusion conditions.

[0005] 3. High-voltage insulation bottleneck. The volume resistivity (1015Ω·cm) of the traditional material is difficult to meet the high-voltage insulation requirement of CTI>600V, and there is a risk of electrical breakdown; it cannot meet the use environment of new energy vehicles high-voltage batteries (800V platform).

[0006] 4. Insufficient chemical corrosion resistance and long-term reliability. HF acid produced by decomposition of electrolyte (LiPF6) at high temperature has strong corrosive effect on PC material, and the environmental brittleness problem of traditional PC material is prominent, which is easy to fail during long-term use.

[0007] 5. Defects in processing technology. Nanomaterials (such as graphene) are easy to agglomerate during modification, resulting in defects such as flow marks and silver streaks in the injection molding products, and the yield is less than 70%.

[0008] Analysis of some schemes in the prior art: Chinese patent CN119242043A discloses a kind of high insulation high thermal insulation composite sheet for lithium battery cell and its preparation process, the process utilizes the insulation and heat resistance of phyllosilicate, integrated in battery pack by three-dimensional forming process, but this scheme needs to add mica isolation layer extra, resulting in battery volume increases by 15%-20%, and mica is high in brittleness, prone to structural cracking under vehicle vibration conditions.

[0009] Chinese patent CN119286187A discloses a kind of high-strength corrosion-resistant ABS composite flame-retardant material and its preparation method, the composite material is composed of the following raw materials: ABS 60-75 parts, glass fiber 10-15 parts, nano alumina 1-3 parts, modified nanomon topsoil 5-8 parts, epoxy modified graphene oxide 1-3 parts, flame retardant 8-12 parts, etc. Although the oxygen index of the composite material is improved, the impact strength is obviously decreased, and high filler can easily lead to the increase of melt viscosity, the increase of production energy consumption and low efficiency.

[0010] Chinese patent CN118109014A discloses a kind of weather-resistant and environmentally-friendly flame-retardant ABS battery shell material and its manufacturing method, including the following raw materials in weight ratio: 30-40 parts of ABS resin raw material, 2 parts of paraffin, 1 part of antioxidant, 20-30 parts of composite flame retardant, 12 parts of antioxidant, 5-8 parts of processing aid, 1 part of composite weathering agent, 1 part of stabilizer, etc. Although the patent improves the flame-retardant performance, it has obvious shortcomings in environmental protection, comprehensive performance balance and industrialization feasibility.

[0011] The present application aims to solve the problems of PC / ABS battery shell material in flame retardancy, lightweight, mechanical strength, chemical corrosion resistance and high voltage insulation. SUMMARY

[0012] To solve the problems in the prior art, the present application provides a synergistically enhanced PC / ABS high flame-retardant material and its preparation method.

[0013] The technical scheme adopted is as follows: the synergistically enhanced PC / ABS high flame-retardant material, by mass, includes: PC resin 55-65 parts, ABS resin 20-30 parts, intumescent flame retardant 5-10 parts, and phyllosilicate 3-8 parts. The PC resin is bisphenol A type aromatic polycarbonate, with a melt flow rate of 10-45 g / 10 min under test conditions of 300℃ / 1.2kg; The ABS resin has a melt index of 15-30 g / 10 min under test conditions of 220℃ / 10kg, and the rubber phase particle size is controlled within 0.5-1.5 μm; The intumescent flame retardant IFR is compounded by ammonium polyphosphate APP, melamine MEL and pentaerythritol PER. The layered silicate is sodium-based montmorillonite modified by hexadecyl trimethyl ammonium bromide.

[0014] Preferably, further comprising: antioxidant, compatibilizer, anti-dripping agent, dispersant, ultraviolet stabilizer and / or lubricant.

[0015] Preferably, the antioxidant is 0.3-0.5 parts, the antioxidant is any one or several of antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant 1098, antioxidant 9228, antioxidant 608; The compatibilizer is 2-4 parts, the compatibilizer is maleic anhydride grafted ABS; The anti-dripping agent is 0.2-0.4 parts, the anti-dripping agent is SN3201; The dispersant is 0.5-1.5 parts, the dispersant is polytetrafluoroethylene micropowder with a particle size of 5 μm; The ultraviolet stabilizer is 0.3-0.8 parts, the ultraviolet stabilizer is benzotriazole; The lubricant is 0.2-0.5 parts, the lubricant is at least one of ethylene bis-stearamide, silicone, zinc stearate, barium stearate, calcium stearate, pentaerythritol stearate.

[0016] Preferably, the PC resin has a light transmittance ≥ 90% and a weight average molecular weight distribution of 20000-50000 g / mol, and the residual monomer content of the ABS resin is < 500 ppm.

[0017] Preferably, the mass ratio of the APP, PER and MEL in the intumescent flame retardant is (4-6): (1-2): 1.

[0018] The preparation method of the synergistically reinforced PC / ABS high-flame-retardant material described above, characterized in that it comprises the following steps: S1, taking each component according to the formula and mixing to obtain a premix; S2, adding the premix to an extruder, melting and extruding, granulating and cooling to obtain a synergistically reinforced PC / ABS high-flame-retardant material.

[0019] Preferably, the preparation of the intumescent flame retardant: in a high-speed blender, add 18-24 parts of APP, 6-8 parts of PER, and 4 parts of MEL, then spray 0.6-1 parts of silane coupling agent, mix thoroughly for 15 minutes to obtain the intumescent flame retardant.

[0020] Preferably, step S1 includes the preparation of flame-retardant masterbatch, the flame retardant is mixed with PC granules at a ratio of 1:4, and 0.1-0.3 parts of antioxidant is added, and the flame-retardant masterbatch is obtained by extruding and granulating.

[0021] Preferably, the preparation of the layered silicate: sodium-based montmorillonite is mixed with cetyltrimethylammonium bromide at a mass ratio of 1:1, stirred in deionized water at 80 DEG C for 4 hours, centrifuged and dried to obtain organically modified montmorillonite.

[0022] Preferably, in step S2, the main screw rotation speed of the twin-screw extruder is 350-450 rpm / min, and the temperature of each zone of the extruder is: 220 DEG C-230 DEG C for the first section, 230 DEG C-240 DEG C for the second section, and 240 DEG C-250 DEG C for the remaining sections and the head.

[0023] Compared with the prior art, the present application has the following advantages: 1. The present application adopts a non-bromine-based flame-retardant system, introduces the synergistic mechanism of layered silicate and intumescent flame retardant, and constructs an environmentally friendly and efficient flame-retardant system. A dense ceramic carbon layer is formed at high temperature, the limiting oxygen index LOI is significantly improved, the vertical burning level reaches V-0 level, the flame-retardant performance breaks through the industry standard, and the risk of ignition caused by thermal runaway is solved.

[0024] 2. The present application constructs a "brick-mud" biomimetic structure through the directional arrangement of layered silicate, and the material density is small, which achieves the purpose of reducing the overall weight of the shell; the 50kN extrusion type is small, the bending modulus of the thin-walled shell is greatly improved, and the light weight and mechanical properties are considered.

[0025] 3. The volume resistivity is 10 16 Ω·cm, which meets the insulation requirements of 800V battery system.

[0026] 4. The insulation performance meets the ultimate demand of high-voltage platform, and the electrochemical corrosion risk is avoided. Through the physical barrier and chemical passivation effect of silicate sheet, the tensile strength retention rate is >95% in LiPF6 electrolyte immersion experiment, which significantly improves the corrosion resistance of the material, improves the environmental brittleness problem of traditional PC materials, and solves the service life problem caused by chemical corrosion of traditional materials.

[0027] 5. The processing technology is optimized, a multi-section shear dispersion process of a twin-screw extruder is designed, the problem of nano filler agglomeration is solved, and the yield of injection molding products is improved to more than 95%.

[0028] In summary, through the layered silicate synergistically enhanced PC / ABS composite material and process innovation, the problems of traditional battery shell materials in flame retardation, light weight, strength, chemical corrosion resistance and high-voltage insulation are solved. The prepared synergistically enhanced PC / ABS high-flame-retardant material is light in quality, has high flame-retardant performance, mechanical properties, corrosion resistance and high-voltage insulation, and can meet the long-term use requirements of power battery shell materials. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a flowchart of the preparation method in the present application. DETAILED DESCRIPTION

[0030] For the purpose of promoting the understanding of the present application, the present application will be described in further detail by referring to the accompanying drawings and specific embodiments. However, the present application can be realized in many different forms and is not limited to the embodiments described in this specification. On the contrary, these embodiments are provided for the purpose of making the disclosure of the present application more thorough and comprehensive.

[0031] The synergistically enhanced PC / ABS high flame-retardant material, in terms of mass parts, comprises the following components: PC resin 55-65 parts, ABS resin 20-30 parts, intumescent flame retardant 5-10 parts, layered silicate 3-8 parts, and antioxidant 0.3-0.5 parts.

[0032] wherein: The PC resin is bisphenol A type aromatic polycarbonate, and the melt flow rate thereof needs to meet 10-45 g / 10 min under the test conditions of 300℃ / 1.2 kg. Preferably, a grade with a light transmittance ≥ 90% and a weight average molecular weight distribution of 20000-50000 g / mol is selected to balance the processing fluidity and mechanical properties.

[0033] The ABS resin is copolymerized from acrylonitrile, butadiene and styrene, and the rubber phase particle size is controlled in the range of 0.5-1.5 μm, and the melt index is 15-30 g / 10 min (220℃ / 10 kg). Preferably, a medical grade material with a residual monomer content < 500 ppm is selected to ensure thermal stability.

[0034] The layered silicate is sodium-based montmorillonite modified by cetyltrimethylammonium bromide. The specific modification scheme is to mix montmorillonite (MMT) and cetyltrimethylammonium bromide (CTAB) in a mass ratio of 1:1, stir in deionized water at 80℃ for 4 hours, centrifuge and dry to obtain organically modified montmorillonite.

[0035] The intumescent flame retardant (IFR) is compounded from ammonium polyphosphate (APP), melamine (MEL) and pentaerythritol (PER) in a certain mass ratio. The specific modification scheme is to add 20 parts of APP, 6 parts of PER and 4 parts of MEL in sequence in a high-speed mixer at a speed of 800 rpm, and then spray silane coupling agent (KH-550, 0.8 parts). Mix thoroughly for 15 minutes to obtain the intumescent flame retardant (IFR). Preferably, the flame retardant is made into a flame retardant master batch. The specific scheme is to mix the flame retardant with PC granules in a ratio of 1:4, add 0.2 parts of antioxidant 1010, extrude and pelletize to obtain the flame retardant master batch, and store for use after drying at 80℃ for 4 hours.

[0036] The antioxidant is any one or several of antioxidant 1010, antioxidant 1076, antioxidant 168, antioxidant 1098, antioxidant 9228, antioxidant 608. Preferably, the antioxidant is composed of hindered phenolic antioxidant and phosphite phenolic antioxidant in a weight ratio of 1:1. Preferably, the antioxidant is a mixture of antioxidant 1076 0.2-0.5 parts and antioxidant 9228 0.2-0.5 parts.

[0037] There are also some other auxiliary agents. For example: anti-dripping agent, SN3201 0.2-0.4 parts, preferably 0.3 parts. Compatibility agent, maleic anhydride grafted ABS (grafting rate 1.2%) 2-4 parts, preferably 3 parts. Dispersing agent, polytetrafluoroethylene (PTFE) powder (particle size 5 μm) 0.5-1.5 parts, preferably 1 part. UV stabilizer, benzotriazole, 0.3-0.8 parts, preferably 0.5 parts. Lubricant, at least one of ethylene bis-stearamide, silicone, zinc stearate, barium stearate, calcium stearate, pentaerythritol stearate, 0.2-0.5 parts, preferably 0.3 parts.

[0038] The preparation method is as follows: S1, take polycarbonate PC, ABS resin, flame retardant, layered silicate, antioxidant and other auxiliary agents according to the proportion, mix in a high-speed mixer at high speed (800 rpm) for 10-15 min to obtain a premix; S2, the premix is added through the discharge port of the twin-screw extruder, melted and extruded, granulated and cooled to obtain a polycarbonate composite material; wherein the main screw rotation speed of the twin-screw extruder is 350-450 rpm / min, and the temperature of each zone of the extruder is as follows: first zone 220-230℃, second zone 230-240℃, third zone 240-250℃, fourth zone 240-250℃, fifth zone 240-250℃, sixth zone 240-250℃, seventh zone 240-250℃, eighth zone 240-250℃, ninth zone 240-250℃, tenth zone 240-250℃, and the die head 240-250℃.

[0039] I. Set up Example 1 and Comparative Examples 1-3, the specific formula is shown in Table 1, and the performance of the prepared PC / ABS composite material is detected, and the test data table is shown in Table 2. Example 1 and Comparative Examples 1-3 all use the method in the application to prepare PC / ABS composite material.

[0040] The materials used in the examples and comparative examples in the present application are as follows: PC resin, model Sabic Lexan 141R; ABS resin, LG Chemical AF312 with 15% rubber content; montmorillonite, model Nanomer®1.30TC, cation exchange capacity 95 meq / 100g; nano-aluminum oxide, purchased from China Aluminum Group Co., Ltd.; intumescent flame retardant (IFR), compounded from ammonium polyphosphate, melamine and pentaerythritol according to a certain mass ratio; SN3201, anti-dripping agent, purchased from Guangzhou Enteng Innovative Materials Co., Ltd.; decabromodiphenyl ethane (DBDPE), purchased from Albemarle, SAYTEX 8010; antioxidants 1076 and 168, purchased from BASF; dispersant pentaerythritol stearate (PETS), purchased from Merck Chemical. Commercially available if not specified.

[0041] Performance detection method: tensile strength according to GB / T1040.2-2022 standard; bending strength according to GB / T9341-2008 standard; notched Izod impact strength according to GB / T1843-2008 standard.

[0042] Table 1 Formulation table of example 1 and comparative examples 1-3 (unit: kg) Among them, example 1 is the technical scheme of the present application, comparative example 1 is the formulation of traditional PC / ABS, comparative example 2 is the formulation of nano-aluminum oxide reinforced PC / ABS, and comparative example 3 is the formulation of traditional bromine-based flame retardant system. Comparative example 1 provides a basis for performance comparison, comparative example 2 verifies the advantage of silicate structure, comparative example 3 compares the defects of traditional flame retardant system, and example 1 verifies the synergistic effect of layered silicate.

[0043] Table 2 Key performance comparison table of example 1 and comparative examples 1-3 As can be seen from table 2, the synergistically reinforced PC / ABS high flame retardant material obtained in example 1 passes UL94 V-0 level certification (1.6 mm thickness), with a limiting oxygen index (LOI) of 32%, and the flame retardant performance is significantly better than that of traditional PC / ABS material, and there is no toxic pollution problem of bromine-based flame retardant system; although comparative example 3 reaches V-0, it contains halogen, and bromine-based flame retardant will release HBr toxic gas at 800℃ thermal runaway; the flame retardant efficiency of comparative example 2 is lower than that of directional arrangement of silicate due to the disordered distribution of nano-Al2O3.

[0044] The density of example 1 is close to that of comparative example 3, but the 50kN extrusion type is only 56% of that of comparative example 3, and is much lower than that of comparative example 1, meeting the dual requirements of lightweight and high strength; although the density of comparative example 1 is low, the strength is insufficient, and the toughness of comparative example 2 is significantly reduced due to the agglomeration of Al2O3.

[0045] Volume resistivity of Example 1 is >10 16 Ω·cm, 1-2 orders of magnitude higher than traditional PC / ABS, perfect for 800V high voltage architecture and L3 level autonomous driving electromagnetic compatibility requirements.

[0046] The material in Example 1 passed the LiPF6 electrolyte immersion experiment, and the tensile strength retention rate was >95%, solving the life problem of traditional materials caused by HF acid corrosion.

[0047] Within the scope of the present application, appropriate changes in the amount of formula material and processing parameters are made for experiments, and the results show that in terms of flame retardation, lightweight, strength, corrosion resistance and high voltage insulation, etc. It has similar performance characteristics to Example 1, i.e. the prepared synergistically enhanced PC / ABS high flame retardant material is light in weight, has high flame retardant performance, mechanical properties, corrosion resistance and high voltage insulation.

[0048] Mechanism analysis of the advantages of the synergistically enhanced PC / ABS high flame retardant material obtained by the method of the present application: 1. Breakthrough of flame retardant performance in industry standards, solve the risk of ignition caused by thermal runaway.

[0049] Experimental data: LOI from 24% to 32% → meet UL94 V-0 level.

[0050] Explanation: ① Nanoscale dispersion of layered silicate → forms a physical barrier → delays oxygen / heat transfer; ② Synergistic effect of silicate layers and intumescent flame retardant (IFR) → catalytic carbonization reaction → dense carbon layer to isolate flame.

[0051] The synergistic mechanism of layered silicate and intumescent flame retardant is introduced, a dense ceramic carbon layer is formed at high temperature, the limiting oxygen index LOI is significantly improved, and the vertical burning level reaches V-0 level; The physical isolation effect of silicate layers significantly reduces the generation of droplets, fundamentally curbs the risk of secondary short circuit, and meets the mandatory requirements of the new European Union battery regulations on thermal runaway protection in 2025.

[0052] 2. Lightweight and strength: weight reduction while strength improvement, breaking the lightweight-strength paradox.

[0053] Calculation result: density 1.23 g / cm 3 The lower bending modulus reaches 3.56 GPa → specific strength exceeds aluminum alloy.

[0054] Explanation: ① Silicate layers are oriented along the stress direction → forming a "brick-mud" reinforcing structure; ② Honeycomb topology design → stress is evenly distributed → local deformation is reduced.

[0055] The "brick-mud" biomimetic structure is constructed by the directional arrangement of the layered silicate, which has a small density and achieves the purpose of reducing the weight of the shell as a whole. The intercalation of the layered silicate layers is enhanced, the 50kN extrusion type is reduced, and the bending modulus of the thin-walled shell is greatly improved, realizing the balance between light weight and mechanical properties.

[0056] 3. The insulation performance reaches the limit requirement of the high-voltage platform, and avoids the risk of electrochemical corrosion.

[0057] Test results: volume resistivity 10 16 Ω·cm.

[0058] Explanation: Silicate sheet layer blocks ion migration channel → prolongs the conduction path.

[0059] Through the physical barrier and chemical passivation effect of the silicate layer, the tensile strength retention rate of LiPF6 electrolyte immersion experiment is >95%, which significantly improves the corrosion resistance of the material, improves the environmental fragility problem of traditional PC materials, and solves the service life problem caused by chemical corrosion of traditional materials.

[0060] II. Layered silicate synergistically reinforced PC / ABS battery shell material good yield verification experiment.

[0061] Experimental design and test conditions: Production batch: A total of 3 batches (A / B / C) were produced, with 500 shells per batch.

[0062] Process parameters: melt temperature 260±5℃, injection pressure 55MPa, holding time 15s.

[0063] Key indicators: dimensional tolerance (±0.2mm), flame retardancy (UL94 V-0), insulation resistance (≥10 16 Ω·cm).

[0064] Defect types: surface shrinkage, flow lines, flame retardant failure, size out-of-tolerance.

[0065] Table 3 Good yield test data Data explanation: The improvement of good yield is mainly due to process optimization (C has improved the control accuracy of mold temperature by ±1℃ compared with A); flame retardant failure is concentrated in the early batches (A has 4 pieces that do not reach V-0 level, and FTIR analysis shows that the flame retardant is not uniformly dispersed). Comprehensive good yield: 98.5% (average of the last 3 batches).

[0066] Process optimization, design double screw extruder multi-section shear dispersion process, solve the problem of nano filler agglomeration, injection molding product good yield rate increased to more than 95%.

[0067] The layered silicate synergistic reinforced PC / ABS high-flame-retardant battery shell material prepared by the application can ensure the stability of the material during processing and use; has high flame-retardant performance and mechanical properties, and meanwhile, the alloy has high corrosion resistance to electrolyte, and can meet the long-term use requirements of power battery shell materials.

[0068] In order to further better realize the application, at least one of the following additives can be further contained without affecting the performance and effects of the high-strength high-flame-retardant lightweight composite material: antistatic agent, colorant, etc.

[0069] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, it should be considered that it is within the scope of the present application.

Claims

1. Synergistically enhanced PC / ABS high flame retardant material, characterized in that, By mass parts, including: PC resin 55~65 parts, ABS resin 20~30 parts, intumescent flame retardant 5~10 parts, layered silicate 3~8 parts; The PC resin adopts bisphenol A type aromatic polycarbonate, and the melt flow rate of the PC resin is 10~45 g / 10 min under the test condition of 300 ℃ / 1.2 kg; The ABS resin has a melt index of 15~30 g / 10 min under the test condition of 220 ℃ / 10 kg, and the particle size of the rubber phase is controlled to be 0.5~1.5 μm; The intumescent flame retardant IFR is compounded by polyammonium phosphate APP, melamine MEL and pentaerythritol PER; The layered silicate is sodium-based montmorillonite modified by cetyltrimethylammonium bromide.

2. Synergistic reinforced PC / ABS high flame retardant material according to claim 1, characterized in that Further comprising: Antioxidants, compatibilizers, anti-dripping agents, dispersants, ultraviolet stabilizers and / or lubricants.

3. The synergistic reinforced PC / ABS high flame retardant material according to claim 2, characterized in that, The antioxidant is 0.3~0.5 parts, and the antioxidant is any one or several of antioxidants 1010, 1076, 168, 1098, 9228 and 608; The compatibilizer is 2~4 parts, and the compatibilizer is maleic anhydride grafted ABS; The anti-dripping agent is 0.2~0.4 parts, and the anti-dripping agent is SN3201; The dispersant is 0.5~1.5 parts, and the dispersant is polytetrafluoroethylene powder with a particle size of 5 μm; The ultraviolet stabilizer is 0.3~0.8 parts, and the ultraviolet stabilizer is a benzotriazole type; The lubricant is 0.2~0.5 parts, and the lubricant is at least one of ethylene bis-stearamide, silicone, zinc stearate, barium stearate, calcium stearate and pentaerythritol stearate.

4. The synergistic reinforced PC / ABS high flame retardant material according to claim 1, characterized in that, The PC resin has a light transmittance of ≥90% and a weight average molecular weight distribution of 20,000~50,000 g / mol.

5. The synergistic reinforced PC / ABS high flame retardant material according to claim 1, characterized in that, The mass ratio of APP, PER and MEL in the intumescent flame retardant is (4-6):(1-2):

1.

6. The process for the preparation of synergistic reinforced PC / ABS high flame retardant material as claimed in any one of claims 1 to 5 wherein, the process is carried out at a temperature in the range of 150 to 200°C. Comprising the following steps: S1, taking each component according to the formula and mixing to obtain a premix; S2, adding the premix into an extruder, and obtaining the synergistically reinforced PC / ABS high flame retardant material through melt extrusion, granulation and cooling.

7. The process for the preparation of synergistic reinforced PC / ABS high flame retardant material as claimed in claim 6, wherein, The preparation of the intumescent flame retardant: in a high-speed blender, 18-24 parts of APP, 6-8 parts of PER and 4 parts of MEL are sequentially added, then 0.6-1 parts of silane coupling agent is sprayed, and fully mixed for 15 minutes to obtain the intumescent flame retardant.

8. The process for the preparation of synergistic reinforced PC / ABS high flame retardant material as claimed in claim 6, wherein, In step S1, the preparation of the flame retardant master batch, the flame retardant is mixed with PC granules at a ratio of 1:4, and 0.1-0.3 parts of antioxidant is added, and the flame retardant master batch is obtained by extrusion and granulation.

9. The process for the preparation of synergistic reinforced PC / ABS high flame retardant material as claimed in claim 6, wherein, The preparation of the layered silicate: sodium-based montmorillonite and cetyltrimethylammonium bromide are mixed at a mass ratio of 1:1, stirred in deionized water at 80 ℃ for 4 hours, centrifuged and dried to obtain organically modified montmorillonite.

10. The process for the preparation of synergistic reinforced PC / ABS high flame retardant material as claimed in claim 6, wherein, In step S2, the main screw rotation speed of the twin-screw extruder is 350~450 rpm / min, and the temperature of each zone of the extruder is: 220 ℃-230 ℃ for the first zone, 230 ℃-240 ℃ for the second zone, and 240 ℃-250 ℃ for the remaining zones and the die head.

Images