Halogen-free flame-retardant PC composite material with low temperature resistance and impact resistance

Abstract

The invention relates to a low-temperature-resistant, impact-resistant, halogen-free and flame-retardant PC (polycarbonate) composite material which comprises the following components in parts by weight: 50-99.1 parts by mass of polycarbonate; 0.5 to 10 parts by mass of a toughening agent; 0.2 to 10 parts by mass of a toughening compatilizer; 0.1-5 parts by mass of a flame retardant; 0.05 to 2 parts by mass of an anti-dripping agent; the halogen-free flame-retardant PC alloy material has the beneficial effects that by adding the toughening compatilizer grafted with maleic anhydride, the compatibility between the toughening agent and PC resin is improved, the problems of PC notch sensitivity and stress concentration cracking are solved, and the flame retardants used in the halogen-free flame-retardant PC alloy material are all halogen-free auxiliary materials, so that the halogen-free flame-retardant PC alloy material is environment-friendly and free of pollution. The halogen-free flame retardant material belongs to an environment-friendly material, conforms to and meets national and international management and control and regulations, does not cause secondary pollution to the environment, is small in halogen-free flame retardant addition amount and remarkable in flame retardant effect, and can meet the flame retardant requirement and fireproof grade under the ultrathin thickness (smaller than or equal to 1.2 mm) in components containing PC and a toughening material.

Description

[Technical field]

[0001] The invention relates to the technical field of polycarbonate composite materials, in particular to a PC composite material with low temperature resistance, impact resistance and halogen-free flame retardancy. [Background technology]

[0002] PC (polycarbonate) is a high molecular polymer containing carbonate groups in the molecular chain. It has excellent comprehensive performance in mechanical mechanics, dimensional stability, toughness, heat resistance and electrical insulation. Due to the special structure of PC, its engineering plastics have become the fastest growing general engineering plastics among the five major engineering plastics. PC plastics and resins are widely used in related industries and fields such as business communication equipment, automotive internal parts and household electronic appliances. The flame retardant grade of PC itself is UL94V-2, and it will drip when exposed to fire. In addition, unmodified PC has problems of notch sensitivity and stress concentration cracking, which is particularly manifested in poor low-temperature impact toughness.

[0003] In actual production and application, PC needs to be modified according to different needs, such as increasing toughness, improving molding and processing performance, reducing residual deformation, and improving flame retardancy. Only in this way can its materials and products be used in more harsh environments, such as cold regions and new energy batteries, in today's globalized mobile Internet.

[0004] At present, there are few studies in the industry on the low-temperature impact resistance and halogen-free flame retardancy of PC materials. This is mainly because toughening agents and elastomers are generally used to enhance and improve impact resistance, which will greatly reduce the flame retardant performance, making it difficult to meet and have both.

[0005] In view of this, it is necessary to provide a PC composite material that has both low temperature resistance and impact resistance and halogen-free flame retardancy to solve the above problems. [Summary of the invention]

[0006] The technical problem to be solved by the present invention is that unmodified PC has problems of notch sensitivity and stress concentration cracking, which is particularly manifested in poor low-temperature impact toughness. At present, toughening agents and elastomer materials are generally used to improve and enhance impact resistance, which greatly reduces flame retardancy, so it is difficult to meet and have both. Therefore, the present invention provides a PC composite material with both low-temperature impact resistance and halogen-free flame retardancy to solve the above problems.

[0007] The solution of the present invention to solve the technical problem is:

[0008] A PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy, characterized in that it comprises the following components in parts by mass:

[0009] Polycarbonate, 50 to 99.1 parts by mass;

[0010] Toughening agent, 0.5 to 10 parts by weight;

[0011] Toughening compatibilizer, 0.2 to 10 parts by weight;

[0012] Flame retardant, 0.1 to 5 parts by mass;

[0013] Anti-dripping agent, 0.05 to 2 parts by mass;

[0014] Antioxidant, 0.05 to 2 parts by mass.

[0015] The low-temperature impact resistance in the present invention refers to the ability of the material to maintain 70% or more of its low-temperature impact resistance at -10°C (compared to that at room temperature).

[0016] The selected polycarbonate is one or more compounds of bisphenol A polycarbonate, polyester polycarbonate, silicone copolymer PC, cyclohexane bisphenol A polycarbonate, and high-temperature resistant polycarbonate synthesized from bisphenol TMC. The melt mass flow rate MI of PC is between (5 and 50) g / 10min (300°C / 1.2kg), the weight average molecular weight is between 20,000 and 50,000, and the molecular weight distribution is between 1 and 2.5. PC can be new material PC or recycled material PC (PCR PC).

[0017] The toughening agent selected can be a compound or use of one or more of unsaturated rubber, saturated rubber, styrene thermoplastic elastomer, polyurethane thermoplastic elastomer, high-density polyethylene (HDPE), polyolefin thermoplastic elastomer, polyamide thermoplastic elastomer, high rubber powder, acrylic copolymer (ACR), etc. and their derivatives.

[0018] The selected toughening compatibilizer material can be a compound of one or more of carboxylic acid type, cyclic anhydride type (MAH), epoxy type, oxazoline type, imide type, isocyanate type and low molecular type, as well as their derivatives.

[0019] The selected flame retardant may include one or more of the following flame retardants in combination: hypophosphite flame retardant, phosphate flame retardant, sulfonate flame retardant, silicone flame retardant and derivatives thereof.

[0020] The selected anti-dripping agent is a fluorine-based PTFE material, including a core-shell coated PTFE material and a non-coated PTFE (pure powder type) material.

[0021] The antioxidant selected can be a combination of one or more of hindered phenols, phosphites, thio antioxidants, etc.

[0022] A product, characterized in that a toughening compatibility agent grafted with maleic anhydride and a small amount of halogen-free flame retardant are added to the product to prepare a PC composite material with both low-temperature resistance and impact resistance and halogen-free flame retardancy.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention improves the compatibility between the toughening agent and the PC resin and improves the problems of PC notch sensitivity and stress concentration cracking by adding a toughening compatibilizer grafted with maleic anhydride.

[0025] 2. The halogen-free flame retardant used in the present invention has a small amount of addition, but a significant flame retardant effect, and the flame retardants used are all halogen-free auxiliary materials, which are environmentally friendly materials, comply with and meet national and international controls and regulations, and will not cause secondary pollution to the environment.

[0026] 3. The present invention can also achieve the flame retardant requirements and fire protection grades at ultra-thin thickness (≤1.2 mm) in the components containing PC and toughening materials.

[0027] 4. The PC used in the present invention is recycled PC (PCR PC), which comes from daily production and life, such as drinking water bottles, CDs, etc., which can reduce plastic pollution, not only reduce carbon dioxide emissions, but also reduce energy consumption. [Specific implementation method]

[0028] In order to further illustrate the technical means and effects adopted by the present invention, the embodiments of the present invention are described in detail below.

[0029] The present invention provides a PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy, which is characterized in that it comprises the following components in parts by mass:

[0030] Polycarbonate, 50 to 99.1 parts by mass;

[0031] Toughening agent, 0.5 to 10 parts by weight;

[0032] Toughening compatibilizer, 0.2 to 10 parts by weight;

[0033] Flame retardant, 0.1 to 5 parts by mass;

[0034] Anti-dripping agent, 0.05 to 2 parts by mass;

[0035] Antioxidant, 0.05 to 2 parts by mass.

[0036] The low-temperature impact resistance in the present invention refers to the ability of the material to maintain 70% or more of its low-temperature impact resistance at -10°C (compared to that at room temperature).

[0037] The selected polycarbonate is one or more compounds of bisphenol A polycarbonate, polyester polycarbonate, silicone copolymer PC, cyclohexane bisphenol A polycarbonate, and high-temperature resistant polycarbonate synthesized from bisphenol TMC. The melt mass flow rate MI of PC is between (5 and 50) g / 10min (300°C / 1.2kg), the weight average molecular weight is between 20,000 and 50,000, and the molecular weight distribution is between 1 and 2.5. PC can be new material PC or recycled material PC (PCR PC).

[0038] The toughening agent selected can be unsaturated rubber (e.g., nitrile rubber (NBR), natural rubber (NR), styrene-butadiene rubber (SBR), butadiene rubber (BR)), saturated rubber (e.g., butyl rubber (IIR), ethylene-propylene rubber (EPR), ethylene-propylene-diene rubber (EPDM), halogenated butyl rubber, silicone rubber), styrene thermoplastic elastomer (e.g., core-shell structured methyl methacrylate-butadiene-styrene terpolymer (MBS), styrene-butadiene-styrene block copolymer (SBS), hydrogenated SBS (S The invention relates to the compounding and use of one or more of thermoplastic elastomers such as polyurethane (EBS), styrene-isoprene-styrene (SIS)), polyurethane thermoplastic elastomers (such as TPU), high-density polyethylene (HDPE), polyolefin thermoplastic elastomers (such as chlorinated polyethylene (CPE), ethylene-octene copolymer (POE), thermoplastic dynamic vulcanizate (TPV), ethylene-vinyl acetate copolymer (EVA)), polyamide thermoplastic elastomers (such as TPAE), high rubber powder, acrylic copolymer (ACR), etc. and their derivatives.

[0039] The selected toughening compatibilizer material can be a carboxylic acid type (e.g., ethylene-methyl acrylate copolymer (E-MA)), a cyclic anhydride type (MAH) (e.g., p(St-MMA-MAH), styrene-butadiene-styrene copolymer grafted with maleic anhydride (SBS-g-MAH), styrene-ethylene-butyl copolymer grafted with maleic anhydride (SEBS-g-MAH)), an epoxy type (e.g., glycidyl methacrylate (GMA), ethylene-methyl acrylate-glycidyl methacrylate triblock copolymer (E-MA-GMA), p(St-An-GMA)), an oxazoline type (e.g., oxazoline grafted PS, i.e., RPS), an imide type (e.g., imide-modified polyacrylate), an isocyanate type (e.g., m-isopropenyl-2,2-dimethylbenzyl isocyanate), a low molecular type (e.g., a reactive compatibilizer, a reactive monomer, a low molecular weight polymer), etc., and the like, as well as one or more of their derivatives.

[0040] The selected flame retardant may include one or more of the following flame retardants in combination: hypophosphite flame retardants (e.g., vinyl aluminum hypophosphite flame retardant, vinyl hypophosphite), phosphate flame retardants (e.g., 1,3-phenylene phosphite (2,6-tolyl) tetraester, tetraphenyl bisphenol A diphosphate and its derivative flame retardant (BDP), tetraphenyl resorcinol diphosphate and its derivative (RDP) flame retardant, triphenyl phosphate (TPP) flame retardant)), sulfonate flame retardants (e.g., potassium benzenesulfonylbenzenesulfonate (KSS), potassium perfluorobutyl sulfonate (PPFBS), sodium 2,4,5-trichlorobenzenesulfonate (STB)), silicone flame retardants (e.g., polysilborane and its derivative flame retardants, cross-linked polydimethylsiloxane (PDMS)) and its derivatives.

[0041] The selected anti-dripping agent is a fluorine-based PTFE material, including a core-shell coated PTFE material and a non-coated PTFE (pure powder type) material.

[0042] The antioxidant selected can be a combination of one or more of hindered phenols (such as (β-3,5-di-tert-butyl-4-hydroxyphenyl) octadecyl acrylate), phosphites (such as tris(2,4-di-tert-butylphenyl) phosphite, dioctadecyl alcohol pentaerythritol diphosphite), thio antioxidants, etc.

[0043] Comparative Example 1

[0044] A PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy comprises the following components in parts by mass: 98.1 parts of PCR PC, 1 part of a toughening agent, 0 parts of a toughening compatibilizer, 0.1 parts of a sulfonate flame retardant, 0.3 parts of a silicone flame retardant, 0.2 parts of an anti-dripping agent, and 0.3 parts of an antioxidant.

[0045] Among them, the selected polycarbonate is recycled material PC (PCR PC), which is bisphenol A type linear polycarbonate, synthesized using the phosgene method, MI = 17g / 10min (300℃ / 1.2kg), weight average molecular weight between 49000 and 50000, and molecular weight distribution between 1.8 and 2.0.

[0046] Among them, the toughening agent selected is styrene-based thermoplastic elastomer MBS, which is a core-shell structured methyl methacrylate-butadiene-styrene terpolymer, which can significantly improve the impact resistance of resins and engineering plastics, and at the same time has excellent heat aging resistance and hydrolysis resistance.

[0047] The toughening compatibilizer material selected is styrene-ethylene-butyl copolymer grafted maleic anhydride (SEBS-g-MAH), wherein styrene:ethylene-butylene=20:80, which has good compatibility with engineering plastics and can be used as a compatibilizer for PS or olefin resins and polar resins.

[0048] Among them, a compound of sulfonate flame retardant and silicone flame retardant is used, which has the advantages of small addition amount and can achieve flame retardant requirements and fire protection level in ultra-thin thickness (≤1.0mm).

[0049] The anti-dripping agent used is non-coated PTFE (pure powder type), which has the characteristics of small addition amount and significant anti-dripping effect.

[0050] Among them, the antioxidant used is a compound of hindered phenols and phosphites, which has a significant synergistic effect and has the characteristics of small addition amount and significant antioxidant and anti-yellowing effects.

[0051] The processing machine used is a twin-screw extruder, the processing temperature is 270-280°C, and the screw speed is 500rpm.

[0052] When preparing the PC composite material with both low-temperature resistance and impact resistance and halogen-free flame retardancy, the components of corresponding weight parts are weighed according to the above ratio, the mixture of each component material is sheared and conveyed by a screw, fully melted and compounded, and then extruded through a die head, stretched, cooled, and pelletized to finally obtain a finished product.

[0053] Example 1

[0054] A PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy comprises the following components in parts by mass: 97.6 parts of PCR PC, 1 part of a toughening agent, 0.5 parts of a toughening compatibilizer, 0.1 parts of a sulfonate flame retardant, 0.3 parts of a silicone flame retardant, 0.2 parts of an anti-dripping agent, and 0.3 parts of an antioxidant.

[0055] Among them, the selected polycarbonate is recycled material PC (PCR PC), which is bisphenol A type linear polycarbonate, synthesized using the phosgene method, MI = 17g / 10min (300℃ / 1.2kg), weight average molecular weight between 49000 and 50000, and molecular weight distribution between 1.8 and 2.0.

[0056] Among them, the toughening agent selected is styrene-based thermoplastic elastomer MBS, which is a core-shell structured methyl methacrylate-butadiene-styrene terpolymer, which can significantly improve the impact resistance of resins and engineering plastics, and at the same time has excellent heat aging resistance and hydrolysis resistance.

[0057] The toughening compatibilizer material selected is styrene-ethylene-butyl copolymer grafted maleic anhydride (SEBS-g-MAH), wherein styrene:ethylene-butylene=20:80, which has good compatibility with engineering plastics and can be used as a compatibilizer for PS or olefin resins and polar resins.

[0058] Among them, a compound of sulfonate flame retardant and silicone flame retardant is used, which has the advantages of small addition amount and can achieve flame retardant requirements and fire protection level in ultra-thin thickness (≤1.0mm).

[0059] The anti-dripping agent used is non-coated PTFE (pure powder type), which has the characteristics of small addition amount and significant anti-dripping effect.

[0060] Among them, the antioxidant used is a compound of hindered phenols and phosphites, which has a significant synergistic effect and has the characteristics of small addition amount and significant antioxidant and anti-yellowing effects.

[0061] The processing machine used is a twin-screw extruder, the processing temperature is 270-280°C, and the screw speed is 500rpm.

[0062] When preparing the PC composite material with both low-temperature resistance and impact resistance and halogen-free flame retardancy, the components of corresponding weight parts are weighed according to the above ratio, the mixture of each component material is sheared and conveyed by a screw, fully melted and compounded, and then extruded through a die head, stretched, cooled, and pelletized to finally obtain a finished product.

[0063] Example 2

[0064] A PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy comprises the following components in parts by mass: 97.1 parts of PCR PC, 1 part of a toughening agent, 1 part of a toughening compatibilizer, 0.1 parts of a sulfonate flame retardant, 0.3 parts of a silicone flame retardant, 0.2 parts of an anti-dripping agent, and 0.3 parts of an antioxidant.

[0065] Among them, the selected polycarbonate is recycled material PC (PCR PC), which is bisphenol A type linear polycarbonate, synthesized using the phosgene method, MI = 17g / 10min (300℃ / 1.2kg), weight average molecular weight between 49000 and 50000, and molecular weight distribution between 1.8 and 2.0.

[0066] Among them, the toughening agent selected is styrene-based thermoplastic elastomer MBS, which is a core-shell structured methyl methacrylate-butadiene-styrene terpolymer, which can significantly improve the impact resistance of resins and engineering plastics, and at the same time has excellent heat aging resistance and hydrolysis resistance.

[0067] The toughening compatibilizer material selected is styrene-ethylene-butyl copolymer grafted maleic anhydride (SEBS-g-MAH), wherein styrene:ethylene-butylene=20:80, which has good compatibility with engineering plastics and can be used as a compatibilizer for PS or olefin resins and polar resins.

[0068] Among them, a compound of sulfonate flame retardant and silicone flame retardant is used, which has the advantages of small addition amount and can achieve flame retardant requirements and fire protection level in ultra-thin thickness (≤1.0mm).

[0069] The anti-dripping agent used is non-coated PTFE (pure powder type), which has the characteristics of small addition amount and significant anti-dripping effect.

[0070] Among them, the antioxidant used is a compound of hindered phenols and phosphites, which has a significant synergistic effect and has the characteristics of small addition amount and significant antioxidant and anti-yellowing effects.

[0071] The processing machine used is a twin-screw extruder, the processing temperature is 270-280°C, and the screw speed is 500rpm.

[0072] When preparing the PC composite material with both low-temperature resistance and impact resistance and halogen-free flame retardancy, the components of corresponding weight parts are weighed according to the above ratio, the mixture of each component material is sheared and conveyed by a screw, fully melted and compounded, and then extruded through a die head, stretched, cooled, and pelletized to finally obtain a finished product.

[0073] Example 3

[0074] A PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy comprises the following components in parts by mass: 96.6 parts of PCR PC, 1.5 parts of a toughening agent, 1 part of a toughening compatibilizer, 0.1 parts of a sulfonate flame retardant, 0.3 parts of a silicone flame retardant, 0.2 parts of an anti-dripping agent, and 0.3 parts of an antioxidant.

[0075] Among them, the selected polycarbonate is recycled material PC (PCR PC), which is bisphenol A type linear polycarbonate, synthesized using the phosgene method, MI = 17g / 10min (300℃ / 1.2kg), weight average molecular weight between 49000 and 50000, and molecular weight distribution between 1.8 and 2.0.

[0076] Among them, the toughening agent selected is styrene-based thermoplastic elastomer MBS, which is a core-shell structured methyl methacrylate-butadiene-styrene terpolymer, which can significantly improve the impact resistance of resins and engineering plastics, and at the same time has excellent heat aging resistance and hydrolysis resistance.

[0077] The toughening compatibilizer material selected is styrene-ethylene-butyl copolymer grafted maleic anhydride (SEBS-g-MAH), wherein styrene:ethylene-butylene=20:80, which has good compatibility with engineering plastics and can be used as a compatibilizer for PS or olefin resins and polar resins.

[0078] Among them, a compound of sulfonate flame retardant and silicone flame retardant is used, which has the advantages of small addition amount and can achieve flame retardant requirements and fire protection level in ultra-thin thickness (≤1.0mm).

[0079] The anti-dripping agent used is non-coated PTFE (pure powder type), which has the characteristics of small addition amount and significant anti-dripping effect.

[0080] Among them, the antioxidant used is a compound of hindered phenols and phosphites, which has a significant synergistic effect and has the characteristics of small addition amount and significant antioxidant and anti-yellowing effects.

[0081] The processing machine used is a twin-screw extruder, the processing temperature is 270-280°C, and the screw speed is 500rpm.

[0082] When preparing the PC composite material with both low-temperature resistance and impact resistance and halogen-free flame retardancy, the components of corresponding weight parts are weighed according to the above ratio, the mixture of each component material is sheared and conveyed by a screw, fully melted and compounded, and then extruded through a die head, stretched, cooled, and pelletized to finally obtain a finished product.

[0083] Example 4

[0084] A PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy comprises the following components in parts by mass: 96.1 parts of PCR PC, 2 parts of a toughening agent, 1 part of a toughening compatibilizer, 0.1 parts of a sulfonate flame retardant, 0.3 parts of a silicone flame retardant, 0.2 parts of an anti-dripping agent, and 0.3 parts of an antioxidant.

[0085] Among them, the selected polycarbonate is recycled material PC (PCR PC), which is bisphenol A type linear polycarbonate, synthesized using the phosgene method, MI = 17g / 10min (300℃ / 1.2kg), weight average molecular weight between 49000 and 50000, and molecular weight distribution between 1.8 and 2.0.

[0086] Among them, the toughening agent selected is styrene-based thermoplastic elastomer MBS, which is a core-shell structured methyl methacrylate-butadiene-styrene terpolymer, which can significantly improve the impact resistance of resins and engineering plastics, and at the same time has excellent heat aging resistance and hydrolysis resistance.

[0087] The toughening compatibilizer material selected is styrene-ethylene-butyl copolymer grafted maleic anhydride (SEBS-g-MAH), wherein styrene:ethylene-butylene=20:80, which has good compatibility with engineering plastics and can be used as a compatibilizer for PS or olefin resins and polar resins.

[0088] Among them, a compound of sulfonate flame retardant and silicone flame retardant is used, which has the advantages of small addition amount and can achieve flame retardant requirements and fire protection level in ultra-thin thickness (≤1.0mm).

[0089] The anti-dripping agent used is non-coated PTFE (pure powder type), which has the characteristics of small addition amount and significant anti-dripping effect.

[0090] Among them, the antioxidant used is a compound of hindered phenols and phosphites, which has a significant synergistic effect and has the characteristics of small addition amount and significant antioxidant and anti-yellowing effects.

[0091] The processing machine used is a twin-screw extruder, the processing temperature is 270-280°C, and the screw speed is 500rpm.

[0092] When preparing the PC composite material with both low-temperature resistance and impact resistance and halogen-free flame retardancy, the components of corresponding weight parts are weighed according to the above ratio, the mixture of each component material is sheared and conveyed by a screw, fully melted and compounded, and then extruded through a die head, stretched, cooled, and pelletized to finally obtain a finished product.

[0093] After the above embodiments were implemented, they were reproduced according to the same components. Comparative Example 1, Example 1, Example 2, Example 3, and Example 4 were melt-extruded and granulated, and then the particles in each embodiment were injection-molded into standard test specimens on an injection molding machine. The mechanical properties of the obtained materials were tested according to the standards. The test results are shown in Table 1:

[0094] Table 1 Test results

[0095]

[0096]

[0097] From the test results of Comparative Example 1, Example 1, Example 2, Example 3, and Example 4, it can be seen that the present invention achieves the preparation of a PC composite material with both low-temperature resistance and impact resistance and halogen-free flame retardancy by adding a toughening compatibility agent grafted with maleic anhydride and a small amount of halogen-free flame retardant.

[0098] The beneficial effects of the present invention are:

[0099] 1. The present invention improves the compatibility between the toughening agent and the PC resin and improves the problems of PC notch sensitivity and stress concentration cracking by adding a toughening compatibilizer grafted with maleic anhydride.

[0100] 2. The halogen-free flame retardant used in the present invention has a small amount of addition, but a significant flame retardant effect, and the flame retardants used are all halogen-free auxiliary materials, which are environmentally friendly materials, comply with and meet national and international controls and regulations, and will not cause secondary pollution to the environment.

[0101] 3. The present invention can also achieve the flame retardant requirements and fire protection grades at ultra-thin thickness (≤1.2 mm) in the components containing PC and toughening materials.

[0102] 4. The PC used in the present invention is recycled PC (PCR PC), which comes from daily production and life, such as drinking water bottles, CDs, etc., which can reduce plastic pollution, not only reduce carbon dioxide emissions, but also reduce energy consumption.

[0103] It should be pointed out that the present invention is not limited to the above-mentioned implementation modes, and any simple modifications, equivalent changes and modifications made to the above-mentioned embodiments by any technician familiar with the profession based on the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A PC composite material with both low temperature resistance and impact resistance and halogen-free flame retardancy, characterized in that: The composition comprises the following components in parts by weight: Polycarbonate, 50 to 99.1 parts by mass; Toughening agent, 0.5 to 10 parts by mass; Toughening compatibilizer, 0.2 to 10 parts by weight; Flame retardant, 0.1 to 5 parts by mass; Anti-dripping agent, 0.05 to 2 parts by mass; Antioxidant, 0.05 to 2 parts by mass.

2. A PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy as claimed in claim 1, characterized in that: The selected polycarbonate is one or more compounds of bisphenol A polycarbonate, polyester polycarbonate, silicone copolymer PC, cyclohexane bisphenol A polycarbonate, and high-temperature resistant polycarbonate synthesized from bisphenol TMC. The melt mass flow rate MI of PC is between (5 and 50) g / 10min (300°C / 1.2kg), the weight average molecular weight is between 20,000 and 50,000, and the molecular weight distribution is between 1 and 2.

5. PC can be new material PC or recycled material PC (PCR PC).

3. The PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy as claimed in claim 1, characterized in that: The toughening agent selected can be a compound or use of one or more of unsaturated rubber, saturated rubber, styrene thermoplastic elastomer, polyurethane thermoplastic elastomer, high-density polyethylene (HDPE), polyolefin thermoplastic elastomer, polyamide thermoplastic elastomer, high rubber powder, acrylic copolymer (ACR), etc. and their derivatives.

4. The PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy as claimed in claim 1, characterized in that: The selected toughening compatibilizer material can be a compound of one or more of carboxylic acid type, cyclic anhydride type (MAH), epoxy type, oxazoline type, imide type, isocyanate type and low molecular type, as well as their derivatives.

5. The PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy as claimed in claim 1, characterized in that: The selected flame retardant may include one or more of the following flame retardants in combination: hypophosphite flame retardant, phosphate flame retardant, sulfonate flame retardant, silicone flame retardant and derivatives thereof.

6. The PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy as claimed in claim 1, characterized in that: The selected anti-dripping agent is a fluorine-based PTFE material, including a core-shell coated PTFE material and a non-coated PTFE (pure powder type) material.

7. The PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy as claimed in claim 1, characterized in that: The antioxidant selected can be a combination of one or more of hindered phenols, phosphites, thio antioxidants, etc.

8. The PC composite material having both low temperature resistance and impact resistance and halogen-free flame retardancy as claimed in claim 1, characterized in that: The processing machine used was a twin-screw extruder, the processing temperature was 270-280°C, and the screw speed was 500 rpm.

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