Phosphorus-free high-flow low-temperature-resistant flame-retardant PC composite material as well as preparation method and application thereof

Abstract

The invention discloses a phosphorus-free high-flow low-temperature-resistant flame-retardant PC composite material and a preparation method and application thereof.The PC composite material comprises 80-95 parts of PC resin, 3-5.5 parts of a flexibilizer, 0.1-1 part of a flame retardant, 0.3-0.8 part of an anti-dripping agent, 0.1-0.4 part of an antioxidant and 0.2-0.5 part of a lubricant, the PC resin comprises PC1 resin and PC2 resin, the melt mass flow rate of the PC1 resin is 10-19 g / 10 min, and the melt mass flow rate of the PC2 resin is 20-30 g / 10 min; the content of the PC2 resin is greater than that of the PC1 resin; the toughening agent is prepared from at least one of E920, M711 and S-2001; the flame retardant is a mixture of FCA-117, FR-300, 3-benzenesulfonyl potassium benzenesulfonate and potassium perfluorobutanesulfonate in a weight ratio of (1-2): (2-3): (3-5): 1. The PC composite material has excellent low temperature resistance, processability and better flame retardant property, and is suitable for preparing large low temperature resistant PC composite material parts.

Description

Technical Field

[0001] The invention belongs to the technical field of PC composite materials, and in particular relates to a phosphorus-free, high-flow, low-temperature-resistant and flame-retardant PC composite material and a preparation method and application thereof. Background Art

[0002] The rapid development of the Internet of Things and the Internet has greatly improved people's quality of life and brought a better experience. The coverage of 5G communication systems and the research and development of 6G communication systems have become bottlenecks that need to be broken through in the development of the Internet of Things and the Internet. The diversity of global topography and climate undoubtedly brings huge challenges to the construction of base stations for 5G communication systems. Therefore, different regions and climates have different requirements for the material performance required for base station construction. For example, Southeast Asia requires materials to be resistant to high temperatures, while North America requires materials to be resistant to low temperatures. Polycarbonate (PC) has excellent impact properties and is widely used in the electronics and electrical industry, especially silicon copolymer PC materials are widely used in 5G communication systems. However, the melt index of flame-retardant PC materials with good low-temperature impact properties on the market is currently low, such as Covestro PCFR6065 and LG's PC8001-10, whose melt index is around 10g / 10min, and can hardly be used for large parts.

[0003] At present, the main methods for preparing low-temperature resistant PC are: (1) compounding silicon copolymer PC with conventional PC resin (2) using toughening agents with low-temperature performance. The first method and the low-temperature resistant PC materials obtained have very low melt indexes, which cannot be used in large-scale parts molding, and the cost is also relatively high. The second method uses the addition of toughening agents, adding more single or compound toughening agents. The resulting PC material has a more obvious low-temperature resistance effect only at low melt indexes. When the melt index exceeds 15g / 10min, its notched impact data at -30℃ frozen for 4h will drop sharply to 25kJ / m 2 , the material shows brittleness, and the addition of more toughening agents will cause the flame retardant properties of the material to deteriorate significantly. In order to solve the degradation of flame retardant properties caused by too many toughening agents, the main method currently used is to use phosphorus flame retardants, but phosphorus flame retardants have a plasticizing effect on PC resin, reducing the intermolecular force, thereby damaging the impact performance of the material. Therefore, balancing the flame retardancy, fluidity and low temperature resistance of PC materials requires particularly stringent modification technology, and there are few related research reports.

[0004] Therefore, there is an urgent need for a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material and a preparation method and application thereof to solve the deficiencies of the existing technical problems. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material and a preparation method and application thereof. The phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material has excellent low-temperature resistance, processing performance and better flame retardant properties, and is suitable for preparing large low-temperature-resistant PC composite material parts.

[0006] To achieve the above object, the present invention provides a phosphorus-free high-flow low-temperature flame-retardant PC composite material, which comprises, by weight, 80-95 parts of PC resin, 3-5.5 parts of toughening agent, 0.1-1 parts of flame retardant, 0.3-0.8 parts of anti-dripping agent, 0.1-0.4 parts of antioxidant and 0.2-0.5 parts of lubricant, wherein the PC resin comprises PC1 resin and PC2 resin, and the PC1 resin has a melt mass flow rate of 10-19 g / 10 mi n, PC2 resin is bisphenol A polycarbonate with a melt mass flow rate of 20-30 g / 10 min; the content of PC2 resin is greater than that of PC1 resin; the toughening agent includes at least one of E920, M711 and S-2001; and the flame retardant is a mixture of FCA-117, FR-300, potassium 3-phenylsulfonylbenzenesulfonate and potassium perfluorobutylsulfonate in a weight ratio of 1-2:2-3:3-5:1.

[0007] Compared with the prior art, the present invention adopts PC1 resin with a melt mass flow rate of 10-19 g / 10min and PC2 resin with a melt mass flow rate of 20-30 g / 10min, and the content of PC2 resin is higher than that of PC1 resin, which makes the phosphorus-free high-flow low-temperature flame-retardant PC composite material have better fluidity and better processing performance. At the same time, the present invention also introduces a specific toughening agent (such as at least one of E920, M711 and S-2001), which performs well under low temperature conditions and can effectively absorb impact energy, thereby greatly improving the notched impact strength of the phosphorus-free high-flow low-temperature flame-retardant PC composite material under extreme low temperature environments. In addition, the present invention also adopts a phosphorus-free flame retardant mixed system, which is a mixture of FCA-117, FR-300, 3-benzenesulfonylbenzene sulfonate potassium and perfluorobutyl sulfonate potassium in a weight ratio of 1-2:2-3:3-5:1, which can effectively reduce the effect of adding more toughening agents on the flame retardant properties of the material. Therefore, the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of the present invention has excellent low-temperature toughness and flame-retardant properties while maintaining good processing performance.

[0008] Furthermore, the content of PC1 resin in the present invention is 4-50 parts; the content of PC2 resin is 40-90 parts.

[0009] Furthermore, the toughening agent of the present invention is a mixture of M711, E920 and S-2001 in a weight ratio of 1-2.5:0.5-1:1-2.

[0010] Furthermore, the anti-dripping agent of the present invention is a modified polytetrafluoroethylene substance.

[0011] Furthermore, the anti-dripping agent of the present invention is at least one of DB105, DB106, and TN3500.

[0012] Furthermore, the antioxidant of the present invention includes at least one of antioxidant 168, antioxidant 1076, antioxidant 1010, and antioxidant 627A.

[0013] Furthermore, the lubricant of the present invention is at least one of pentaerythritol stearate, N,N-ethylene bis stearate, and hydrocarbon lubricants.

[0014] Accordingly, the second aspect of the present invention provides a method for preparing a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material, the steps comprising: (1) Mixing the formulated amount of PC resin, toughening agent, flame retardant, anti-dripping agent, antioxidant and lubricant to obtain a mixture; (2) The mixed material is added to a twin-screw extruder for granulation to obtain a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material.

[0015] Correspondingly, the third aspect of the present invention provides an application of the above-mentioned phosphorus-free, high-flow, low-temperature resistant, flame-retardant PC composite material or the phosphorus-free, high-flow, low-temperature resistant, flame-retardant PC composite material prepared by the preparation method of the above-mentioned phosphorus-free, high-flow, low-temperature resistant, flame-retardant PC composite material in the preparation of large-scale low-temperature resistant PC composite material parts. DETAILED DESCRIPTION

[0016] In order to better illustrate the purpose, technical scheme and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

[0017] In molding processes such as injection molding or extrusion, materials with poor fluidity are difficult to evenly fill into complex mold cavities. This problem is particularly prominent for large or complex parts, which may lead to insufficient filling of some areas, resulting in material shortages or voids, affecting the integrity and appearance quality of the final product. The phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material provided by the present invention has excellent low-temperature toughness and flame-retardant properties while maintaining good processing performance, so it has a wide range of uses, especially suitable for the preparation of large low-temperature-resistant PC composite parts, such as 5G base station AAU, electronic appliances, etc.

[0018] The phosphorus-free high-flow low-temperature flame-retardant PC composite material of the present invention comprises, by weight, 80-95 parts of PC resin, 3-5.5 parts of toughening agent, 0.1-1 parts of flame retardant, 0.3-0.8 parts of anti-dripping agent, 0.1-0.4 parts of antioxidant and 0.2-0.5 parts of lubricant.

[0019] The content of PC resin may be, but is not limited to, 80 parts, 82 parts, 85 parts, 88 parts, 90 parts, 92 parts, 94 parts, and 95 parts.

[0020] Wherein, PC resin includes PC1 resin and PC2 resin, PC1 resin is bisphenol A type polycarbonate and has a melt mass flow rate of 10-19 g / 10 min (test temperature is 300°C, load is 1.2 kg); PC2 resin is bisphenol A type polycarbonate and has a melt mass flow rate of 20-30 g / 10 min (test temperature is 300°C, load is 1.2 kg). Preferably, the melt mass flow rate of PC1 resin is 10 g / 10 min; the melt mass flow rate of PC2 resin is 20 g / 10 min.

[0021] Among them, the content of PC2 resin is greater than that of PC1 resin, which can ensure that the phosphorus-free high-flow low-temperature flame-retardant PC composite material has good fluidity and better processing performance. Specifically, the content of PC1 resin is 4 to 50 parts; the content of PC2 resin is 40 to 90 parts; for example, the content of PC1 resin can be but not limited to 4 parts, 5 parts, 8 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts; for example, the content of PC2 resin can be but not limited to 40 parts, 45 parts, 49 parts, 52 parts, 58 parts, 63 parts, 66 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts.

[0022] Among them, the content of the toughening agent can be but is not limited to 3 parts, 3.3 parts, 3.8 parts, 4.1 parts, 4.3 parts, 4.6 parts, 4.8 parts, 5.0 parts, 5.2 parts, and 5.5 parts.

[0023] The toughening agent includes at least one of E920, M711 and S-2001. Specifically, E920 and M711 are MBS toughening agents, which show excellent toughening effects in low temperature environments; while S-2001, as a silicone acrylic toughening agent, also has excellent low-temperature impact performance. By optimizing the internal structure of the material, it can greatly improve its impact performance without significantly affecting the fluidity of the material.

[0024] Among them, the toughening agent is a mixture of M711, E920 and S-2001 in a weight ratio of 1~2.5:0.5~1:1~2. Although E920 and M711 belong to the same silicone acrylic class, they differ in rubber content and rubber particle size, and these differences affect their physical properties and application effects. Specifically, E920 and M711 contain different proportions of rubber components and their particle sizes, which not only affect the flexibility and processing properties of the material, but also largely determine its low-temperature impact performance. The inventors of the present application have found through multiple studies that adjusting the rubber phase content and particle size in the two toughening agents can significantly improve the impact strength of the composite material under low temperature conditions; in addition, the inventors of the present invention have also found that when the silicone toughening agent S-2001 is used in combination with E920 and M711, the low-temperature impact performance of the material can be further enhanced. Therefore, when the toughening agent is a mixture of M711, E920 and S-2001 in a weight ratio of 1-2.5:0.5-1:1-2, the notched impact strength of the phosphorus-free high-flow low-temperature flame-retardant PC composite material in an extreme low temperature environment can be significantly improved. Preferably, the toughening agent is a mixture of M711, E920 and S-2001 in a weight ratio of 2:1:1.

[0025] Among them, the content of the flame retardant can be but not limited to 0.1 part, 0.2 part, 0.3 part, 0.5 part, 0.7 part, 0.8 part, 0.9 part, and 1 part. Specifically, the flame retardant is a mixture of FCA-117, FR-300, potassium 3-phenylsulfonylbenzenesulfonate and potassium perfluorobutylsulfonate in a weight ratio of 1~2:2~3:3~5:1. Different types of flame retardants have different effects on the physical and chemical properties of materials. For example, silicon-containing flame retardants (FCA-117 and FR-300) can form a protective layer at high temperatures to prevent oxygen and heat from being transferred to the interior of the material. Excessive use may affect the rigidity and strength of the material; while sulfonic acid-containing flame retardants (potassium 3-phenylsulfonylbenzenesulfonate and potassium perfluorobutylsulfonate) can promote the formation of a carbonized layer and further prevent the spread of flames. Although they can effectively improve flame retardancy, excessive use may cause the material to become brittle or difficult to process. Therefore, controlling the weight ratio of these four to 1~2:2~3:3~5:1 can maximize the synergistic effect between them, thereby optimizing the flame retardant properties of the material.

[0026] The content of the anti-dripping agent may be, but is not limited to, 0.3, 0.4, 0.5, 0.6, 0.7, or 0.8. Specifically, the anti-dripping agent is a modified polytetrafluoroethylene-based substance, and further, the anti-dripping agent includes at least one of DB105, DB106, and TN3500.

[0027] The content of the antioxidant may be, but is not limited to, 0.1 part, 0.25 part, 0.3 part, 0.35 part, or 0.4 part. The antioxidant includes at least two of the antioxidant 168, the antioxidant 1076, the antioxidant 1010, and the antioxidant 627A.

[0028] The content of the lubricant may be, but is not limited to, 0.2, 0.25, 0.28, 0.30, 0.4, 0.45, or 0.5. The lubricant includes at least one of pentaerythritol stearate, N,N-ethylene bis stearyl, and hydrocarbon lubricants.

[0029] The method for preparing the phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material of the present invention comprises the following steps: (1) Mixing the formulated amount of PC resin, toughening agent, flame retardant, anti-dripping agent, antioxidant and lubricant to obtain a mixture; (2) The mixed material is added to a twin-screw extruder for granulation to obtain a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material.

[0030] Among them, the process temperature of each screw zone in the twin-screw extruder is as follows: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0031] In order to better illustrate the purpose, technical scheme and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

[0032] Source of raw materials PC1: LG PC 1201 10P, melt mass flow rate: 10g / 10min; PC2: LG 1201-22 W0990T, melt mass flow rate 20g / 10min; M-711, Kaneka Chemical, Japan; E920, Arkema, France; S-2001, Mitsubishi Chemical, Japan; EXL2620, Dow Chemical; MR-502, Kaneka Chemical Co., Ltd., Japan; Potassium 3-phenylsulfonylbenzenesulfonate, Hubei Xinghengye Technology Co., Ltd.; Potassium perfluorobutanesulfonate, Zhongxiang Chemical; Silicone flame retardant FCA-117, Dow Corning; Silicon flame retardant FR-300, Puxin; Antioxidant 168, BASF; Antioxidant 1076, BASF; Anti-drip agent, AS coated PTFE type anti-drip agent from Puxin or 3M; Pentaerythritol stearate, Japan Riken lubricant SL-440AT.

[0033] Example 1 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of S-2001 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0034] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0035] Example 2 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of M-711 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0036] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, M-711 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0037] Example 3 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of E920 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0038] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, E920 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0039] Example 4 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The preparation raw materials include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 2 parts of M-711 toughening agent, 2 parts of E920 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0040] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, 2 parts of M-711 toughening agent, 2 parts of E920 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0041] Example 5 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 2 parts of M-711 toughening agent, 2 parts of S-2001 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0042] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, 2 parts of M-711 toughening agent, 2 parts of S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0043] Example 6 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 2 parts of M-711 toughening agent, 1 part of E920 toughening agent, 1 part of S-2001 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0044] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, M-711 toughening agent, E920 toughening agent, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0045] Example 7 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 2.5 parts of M-711 toughening agent, 0.5 parts of E920 toughening agent, 1 part of S-2001 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0046] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, M-711 toughening agent, E920 toughening agent, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0047] Example 8 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 1 part of M-711 toughening agent, 0.5 parts of E920 toughening agent, 2.5 parts of S-2001 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0048] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, M-711 toughening agent, E920 toughening agent, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0049] Example 9 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 45.15 parts of PC1 resin, 50 parts of PC2 resin, 3 parts of M-711 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0050] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, M-711 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0051] Example 10 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 24.15 parts of PC1 resin, 70 parts of PC2 resin, 2.5 parts of M-711 toughener, 0.5 parts of E920 toughener, 1 part of S-2001 toughener, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0052] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, M-711 toughening agent, E920 toughening agent, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0053] Embodiment 11 The present embodiment provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 4.15 parts of PC1 resin, 90 parts of PC2 resin, 2.5 parts of M-711 toughening agent, 0.5 parts of E920 toughening agent, 1 part of S-2001 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0054] The preparation method of the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of this embodiment comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, M-711 toughening agent, E920 toughening agent, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0055] Comparative Example 1 This comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of EXL2620 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0056] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, EXL2620 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0057] Comparative Example 2 The comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of MR-502 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0058] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, MR-502 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0059] Comparative Example 3 The comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of S-2001 toughening agent, 0.4 parts of FCA-117, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0060] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0061] Comparative Example 4 This comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of S-2001 toughening agent, 0.4 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0062] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0063] Comparative Example 5 This comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of S-2001 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.45 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0064] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0065] Comparative Example 6 This comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of S-2001 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.45 parts of potassium perfluorobutane sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0066] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0067] Comparative Example 7 The comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of M-711 toughening agent, 0.1 parts of FCA-117, 0.1 parts of FR-300, 0.25 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutylsulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0068] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, M-711 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0069] Comparative Example 8 The comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of E920 toughening agent, 0.1 parts of FCA-117, 0.1 parts of FR-300, 0.25 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0070] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, E920 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0071] Comparative Example 9 The comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 4 parts of S-2001 toughening agent, 0.1 parts of FCA-117, 0.1 parts of FR-300, 0.25 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0072] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0073] Comparative Example 10 The comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 44.15 parts of PC1 resin, 50 parts of PC2 resin, 6 parts of M-711 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0074] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, M-711 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0075] Comparative Example 11 The comparative example provides a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material. The raw materials for preparation include, by weight, 64.15 parts of PC1 resin, 30 parts of PC2 resin, 2.5 parts of M-711 toughening agent, 0.5 parts of E920 toughening agent, 1 part of S-2001 toughening agent, 0.15 parts of FCA-117, 0.25 parts of FR-300, 0.35 parts of potassium 3-phenylsulfonylbenzenesulfonate, 0.1 parts of potassium perfluorobutyl sulfonate, 0.3 parts of anti-dripping agent, 0.3 parts of antioxidant 168, 0.1 parts of antioxidant 1076, and 0.3 parts of pentaerythritol stearate.

[0076] The preparation method of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of this comparative example comprises the following steps: (1) Mixing Mixing the formulated amounts of PC1 resin, PC2 resin, M-711 toughening agent, E920 toughening agent, S-2001 toughening agent, flame retardant, antioxidant 168, antioxidant 1076, anti-dripping agent and pentaerythritol stearate to obtain a mixture; (2) Extrusion granulation The mixed materials are added to the twin-screw extruder for granulation. The process temperature of each barrel zone of the twin-screw extruder is: zone 1 temperature 140±5℃, zone 2 temperature 245±5℃, zone 3 temperature 255±5℃, zone 4 temperature 255±5℃, zone 5 temperature 255±5℃, zone 6 temperature 245±5℃, zone 7 temperature 240±5℃, zone 8 temperature 240±5℃, zone 9 temperature 245±5℃, zone 10 temperature 255±5℃.

[0077] The melt index of the phosphorus-free high-flow low-temperature flame-retardant PC composite materials prepared in Examples 1 to 11 and Comparative Examples 1 to 11 was tested with reference to ASTM D1238 standard. The test results are shown in Table 1.

[0078] The phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite materials obtained in Examples 1 to 11 and Comparative Examples 1 to 11 were dried in a blast oven at 90 to 100° C. for 3 to 4 hours, and then injection molded on an injection molding machine to prepare samples. The following tests were performed, and the results are shown in Table 1.

[0079] (1) Tensile strength test: carried out according to ASTM D638 standard, with a tensile speed of 50 mm / min.

[0080] (2) Bending strength test: carried out according to ASTM D790 standard, with a bending speed of 5 mm / min and a span of 50 mm.

[0081] (3) Flexural modulus test: carried out in accordance with ASTM D790 standard, with a bending speed of 5 mm / min and a span of 50 mm.

[0082] (4) Flame retardant performance test: According to the UL-94-2009 test standard, the sample size is 127×12.7×1.6 cm 3 .

[0083] (5) Izod notched impact strength test: carried out in accordance with ASTM D256 standard.

[0084] Table 1 Performance test results of embodiments and comparative examples

[0085] According to Table 1, the melt index of the phosphorus-free high-flow low-temperature flame-retardant PC composite material of Examples 1 to 11 is greater than or equal to 14.9 g / 10 min and the impact strength after freezing at -30°C for 4 hours exceeds 37 kJ / m 2 , and the material can still reach the V0 flame retardant level with a thickness of 1.6 mm, which shows that the phosphorus-free high-flow low-temperature resistant flame-retardant PC composite material of the present invention has excellent low-temperature toughness and flame retardant properties while maintaining good processing performance, and is suitable for preparing large low-temperature resistant PC composite parts.

[0086] By comparing Examples 1 to 11, it can be seen that the PC composite material of Example 6 has a notched impact strength of more than 50 kJ / m2 when the melt index exceeds 15 g / 10 min at -30 °C for 4 h. 2 , and the material can still achieve V0 flame retardant level at 1.6mm thickness, so the weight ratio of M711, E920 and S-2001 is preferably 2:1:1.

[0087] By comparing Examples 1 to 3 with Comparative Example 1, it can be seen that the impact strength of the PC composite material of Comparative Example 1 is lower than 20 kJ / m after being frozen at -30°C for 4 hours. 2 , that is, the impact resistance is relatively poor, which shows that although EXL-2620 is an effective MBS toughening agent that performs well in improving the impact resistance of materials, but its impact resistance under low temperature conditions is relatively poor. Therefore, EXL-2620 is not suitable as a low-temperature toughening agent in the PC composite material of this application.

[0088] By comparing Examples 1 to 3 with Comparative Example 2, it can be seen that the melt index of the PC composite material of Comparative Example 2 is lower than 14.9 g / 10 min, which shows that although MR-502 is also a silicone acrylic toughening agent, it will cause the melt index to decrease, which means that it will reduce the fluidity of the material. Therefore, MR-502 is not suitable as a low-temperature toughening agent in the PC composite material of this application.

[0089] Comparing Example 1 with Comparative Examples 3 to 6, it can be seen that removing any one of FCA-117, FR-300, potassium 3-phenylsulfonylbenzenesulfonate and potassium perfluorobutylsulfonate will make the PC composite material unable to reach the V0 flame retardant level of 1.6 mm thickness.

[0090] By comparing Example 1 with Comparative Example 9, Example 2 with Comparative Example 7, and Example 3 with Comparative Example 8, it can be seen that when the weight ratio of FCA-117, FR-300, potassium 3-phenylsulfonylbenzenesulfonate and potassium perfluorobutylsulfonate is not 1-2:2-3:3-5:1, the PC composite material cannot reach the V0 flame retardant level of 1.6 mm thickness.

[0091] By comparing Example 2, Example 9 and Comparative Example 10, it can be seen that the low-temperature resistance of the material is not linearly related to the amount of toughening agent added. The low-temperature toughening effect of 6 parts of toughening agent is lower than that of 4 parts of toughening agent. Therefore, the content of toughening agent is preferably 3 to 5.5 parts.

[0092] It can be seen from Example 7, Example 10, Example 11 and Comparative Example 11 that the melt index has a greater influence on the low-temperature impact strength of the material. As the melt index increases, the low-temperature impact strength decreases significantly.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it is not limited to those listed in the embodiments. Those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material, characterized in that: The invention comprises 80-95 parts of PC resin, 3-5.5 parts of toughening agent, 0.1-1 parts of flame retardant, 0.3-0.8 parts of anti-dripping agent, 0.1-0.4 parts of antioxidant and 0.2-0.5 parts of lubricant in parts by mass, wherein the PC resin comprises PC1 resin and PC2 resin, the PC1 resin is bisphenol A polycarbonate with a melt mass flow rate of 10-19 g / 10 min, and the PC2 resin is bisphenol A polycarbonate with a melt mass flow rate of 20-30 g / 10 min; the content of the PC2 resin is greater than that of the PC1 resin; the toughening agent comprises at least one of E920, M711 and S-2001; the flame retardant is a mixture of FCA-117, FR-300, potassium 3-phenylsulfonylbenzenesulfonate and potassium perfluorobutylsulfonate in a weight ratio of 1-2:2-3:3-5:

1.

2. The phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material according to claim 1, characterized in that: The PC1 resin content is 4-50 parts; the PC2 resin content is 40-90 parts.

3. The phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material according to claim 1, characterized in that: The toughening agent is a mixture of M711, E920 and S-2001 in a weight ratio of 1-2.5:0.5-1:1-2.

4. The phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material according to claim 1, characterized in that: The anti-dripping agent is a modified polytetrafluoroethylene substance.

5. The phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material according to claim 4, characterized in that: The anti-dripping agent is at least one of DB105, DB106, and TN3500.

6. The phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material according to claim 1, characterized in that: The antioxidant includes at least one of antioxidant 168, antioxidant 1076, antioxidant 1010, and antioxidant 627A.

7. The phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material according to claim 1, characterized in that: The lubricant is at least one of pentaerythritol stearate, N,N-ethylene bis stearate, and hydrocarbon lubricants.

8. The method for preparing the phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material according to any one of claims 1 to 7, characterized in that the steps include: (1) Mixing the formulated amount of PC resin, toughening agent, flame retardant, anti-dripping agent, antioxidant and lubricant to obtain a mixture; (2) Adding the mixed material to a twin-screw extruder for granulation to obtain a phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material.

9. Use of the phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material as claimed in any one of claims 1 to 7 or the phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material prepared by the preparation method of the phosphorus-free, high-flow, low-temperature-resistant, flame-retardant PC composite material as claimed in claim 8 in the preparation of large-scale low-temperature-resistant PC composite material products.

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