High temperature resistant halogen-containing flame-retardant polycarbonate insulation film and preparation method thereof

Abstract

The application discloses a high-temperature-resistant halogen-containing flame-retardant polycarbonate insulating film and a preparation method thereof, and relates to the technical field of polycarbonate films.The insulating film comprises the following components in percentage by weight: 65-80% of aromatic polycarbonate resin, 15-40% of flame retardant, 3-10% of toughening agent, 0.1-1% of antioxidant, 0.1-0.8% of release agent, 0.1-1% of dispersing lubricant, 0.5-1.2% of carbon black, and 0.5-10% of inorganic mineral filler and silane coupling agent.The application provides a high-temperature-resistant halogen-containing flame-retardant polycarbonate insulating film and a preparation method thereof, and the synergistic effect is generated by compounding the flame retardant and the inorganic mineral filler and silane coupling agent as flame-retardant synergistic agents, so that the purpose of flame-retardant polycarbonate and increasing the heat distortion temperature is achieved.The flame-retardant ability of the insulating film reaches UL94V0 under the thickness of 0.05-0.25 mm.

Description

Technical Field

[0001] This invention relates to the field of polycarbonate film technology, specifically to a high-temperature resistant halogenated flame-retardant polycarbonate insulating film and its preparation method. Background Technology

[0002] Polycarbonate is an excellent flame-retardant insulating material, possessing UL94 V-2 flame-retardant performance without additives. However, with the rapid development of electronic information technology, electronic products are becoming increasingly smaller, requiring thinner polycarbonate flame-retardant insulating films. Currently available polycarbonate flame-retardant insulating films cannot meet the UL94V-0 performance requirements for films thinner than 0.25mm. Chinese patent CN102276970A discloses a halogen-free flame-retardant thin-film polycarbonate material and its preparation method, but it can only achieve UL94V-0 flame-retardant performance for films with a thickness of 0.25-0.76mm, failing to meet the UL94V-0 requirement for films thinner than 0.25mm. Furthermore, Chinese patent CN109666281A discloses a halogen-free flame-retardant heat-molded polycarbonate material for high-transparency films and its preparation method, but it can only achieve UL94VTM-0 flame-retardant performance for films with a thickness of 0.03-0.25mm. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a high-temperature resistant halogenated flame-retardant polycarbonate insulating film and its preparation method.

[0004] In a first aspect, a high-temperature resistant halogenated flame-retardant polycarbonate insulating film is provided, comprising the following components by weight percentage: 65-80% aromatic polycarbonate resin, 15%-40% flame retardant, 3%-10% toughening agent, 0.1%-1% antioxidant, 0.1-0.8% release agent, 0.1-1% dispersing lubricant, 0.5-1.2% carbon black, and 0.5-10% inorganic mineral filler and silane coupling agent.

[0005] Furthermore, the flame retardant is one or more of the following: bromine-based flame retardant, organophosphorus flame retardant, organosilicon flame retardant, and perfluorobutyl sulfonate flame retardant; the inorganic mineral filler is one or more of the following: flake montmorillonite, kaolin, bentonite, mica powder, or talc powder.

[0006] Preferably, the median particle size of the inorganic mineral filler is 2 μm and the top cut particle size is 10 μm.

[0007] Furthermore, the flame retardant is a brominated flame retardant, specifically a tribromophenoxytetrabromobisphenol A carbonate oligomer; the inorganic mineral filler is talc; and the silane coupling agent is γ-aminopropyltriethoxysilane.

[0008] Furthermore, the weight ratio of the flame retardant to the inorganic mineral filler to the silane coupling agent is 1:(0.1-0.5).

[0009] Furthermore, the weight ratio of the flame retardant to the toughening agent is 1:(0.1-0.6).

[0010] Furthermore, the toughening agent is one or more of the following: ethylene-methyl acrylate copolymer, polymer composed of methyl methacrylate and organosilicon, and methyl methacrylate-butadiene-styrene (MBS) terpolymer.

[0011] Preferably, the toughening agent is a mixture of a polymer composed of ethylene-methyl acrylate copolymer, methyl methacrylate, and organosilicon.

[0012] Furthermore, the aromatic polycarbonate resin has a melt flow index of 5-15 and a relative molecular weight of 25,000-40,000.

[0013] Furthermore, the antioxidant is one or more of phenolic antioxidants, phosphite antioxidants, and organosulfur antioxidants.

[0014] Furthermore, the release agent is one or more of polydimethylsiloxane, polyethylene wax, polyether polyol, and polyethylene glycol, and the dispersing lubricant is one or more of oleamide, erucamide, stearamide, and ethylene bis-stearamide.

[0015] Preferably, the carbon black is powdered carbon black or carbon black masterbatch.

[0016] In a second aspect, a method for preparing a high-temperature resistant halogenated flame-retardant polycarbonate insulating film as described in the first aspect is provided, characterized by comprising the following steps: a. Thoroughly dry the aromatic polycarbonate resin, flame retardant, toughening agent, antioxidant, release agent, dispersant lubricant, carbon black, inorganic mineral filler, and silane coupling agent until the moisture content is below 0.02%; b. Weigh the dried aromatic polycarbonate resin, flame retardant, toughening agent, antioxidant, release agent, dispersing lubricant, carbon black, inorganic mineral filler and silane coupling agent according to the formula and mix them evenly in a mixer to obtain a mixture; c. The mixture obtained in step b is used to prepare polycarbonate composite plastic particles through a twin-screw granulator; the temperature of the twin-screw granulator is 230-270℃ and the screw speed is 200-400r / min; d. Dry the prepared polycarbonate composite plastic particles for 4-8 hours at a temperature of 115℃-125℃. e. The dried polycarbonate composite plastic particles from step d are added to a sheet extruder and calendered using a three-roll mill to produce a film with a thickness of 0.05–0.25 mm, thus obtaining a high-temperature resistant halogenated flame-retardant polycarbonate insulating film. The temperature of the sheet extruder is 240–275 °C.

[0017] Preferably, in step b, the mixing time of the mixer is 5-10 minutes.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a high-temperature halogen-resistant flame-retardant polycarbonate insulating film and its preparation method. By using flame retardants, inorganic mineral fillers, and silane coupling agents as flame-retardant synergists and adjusting their ratio, a synergistic effect is achieved to retard the polycarbonate and increase its heat distortion temperature. Furthermore, the toughening agent and flame retardant also contribute to the synergistic flame-retardant effect, improving the physical properties of the polycarbonate film. The high-temperature halogen-resistant flame-retardant polycarbonate insulating film of this invention achieves UL94V0 flame retardancy at a thickness of 0.05-0.25 mm. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] The high temperature resistance mentioned in this invention refers to a film heat distortion temperature of 150°C or higher.

[0022] As an example, the aromatic polycarbonate resin of the present invention may be one or more of Covestro 3113 and Teijin 1250Y.

[0023] As an example, the flame retardant of the present invention may be one or more of Lanxess BC58 and Lanxess BC52.

[0024] As an example, the antioxidant of the present invention may be Liansheng B215 (a composite antioxidant composed of phosphite antioxidants and phenolic antioxidants).

[0025] As an example, the toughening agent of the present invention may be one or more of Mitsubishi S2001 (a polymer composed of methyl methacrylate and organosilicon) and Arkema toughening agent Lotader AX8900 (methyl methacrylate-butadiene-styrene terpolymer).

[0026] As an example, the mold release agent of the present invention may be Shin-Etsu 1000cst (polydimethylsiloxane).

[0027] As an example, the dispersing lubricant of the present invention may be ethylene bis-stearamide of CMS CHEM.

[0028] As an example, the carbon black of the present invention may be Orion HIBLACK 970LB.

[0029] As an example, the silane coupling agent of the present invention is KH-550 silane coupling agent.

[0030] As an example, the talc powder of the present invention may be Hemings M04SLC.

[0031] Example 1 A high-temperature resistant halogenated flame-retardant polycarbonate insulating film comprises the following components: 71 kg aromatic polycarbonate resin, 15 kg flame retardant (tribromophenoxytetrabromobisphenol A carbonate oligomer), 0.4 kg antioxidant (phosphite antioxidant and phenolic antioxidant), 5 kg toughening agent (polymer composed of 3 kg methyl methacrylate and organosilicon, 2 kg ethylene-methyl acrylate copolymer), 0.3 kg release agent (polydimethylsiloxane), 0.3 kg dispersing lubricant (ethylene bis-stearamide), 0.5 kg carbon black, and 7.5 kg inorganic mineral filler and silane coupling agent (the inorganic mineral filler is talc, and the silane coupling agent is γ-aminopropyltriethoxysilane).

[0032] The aromatic polycarbonate resin has a melt flow index of 10 and a relative molecular weight of 35,000. The talc powder has a median particle size of 2 μm and a top-cut particle size of 10 μm. The carbon black is in powder form.

[0033] The preparation method of the high-temperature resistant halogenated flame-retardant polycarbonate insulating film of Example 1 includes the following steps: a. Thoroughly dry the aromatic polycarbonate resin, flame retardant, toughening agent, antioxidant, release agent, dispersant lubricant, carbon black, inorganic mineral filler, and silane coupling agent until the moisture content is 0.01%; b. Weigh the dried aromatic polycarbonate resin, flame retardant, toughening agent, antioxidant, release agent, dispersing lubricant, carbon black, inorganic mineral filler and silane coupling agent according to the formula and mix them evenly in a mixer for 5 minutes to obtain a mixture; c. The mixture obtained in step b is used to prepare polycarbonate composite plastic particles through a twin-screw granulator; the temperature of the twin-screw granulator is 250℃ and the screw speed is 300r / min; d. Dry the prepared polycarbonate composite plastic particles for 5 hours at a temperature of 120°C. e. The dried polycarbonate composite plastic particles from step d are added to a sheet extruder and calendered using a three-roll mill to produce films with thicknesses of 0.05 mm, 0.1 mm, and 0.25 mm, respectively, thus obtaining the high-temperature halogenated flame-retardant polycarbonate insulating film of Example 1. The temperature of the sheet extruder is 255°C.

[0034] The preparation methods of the high-temperature halogenated flame-retardant polycarbonate insulating films of Examples 2-5 and Comparative Examples 1-13 are the same as those of Example 1.

[0035] Example 2 A high-temperature resistant halogenated flame-retardant polycarbonate insulating film comprises the following components: 66 kg aromatic polycarbonate resin, 20 kg flame retardant (tribromophenoxytetrabromobisphenol A carbonate oligomer), 0.4 kg antioxidant (phenolic antioxidant, phosphite antioxidant), 5 kg toughening agent (polymer composed of 3 kg methyl methacrylate and organosilicon, 2 kg ethylene-methyl acrylate copolymer), 0.3 kg release agent (polydimethylsiloxane), 0.3 kg dispersing lubricant (ethylene bis-stearamide), 0.5 kg carbon black, and 7.5 kg inorganic mineral filler and silane coupling agent (the inorganic mineral filler is talc, and the silane coupling agent is γ-aminopropyltriethoxysilane).

[0036] The aromatic polycarbonate resin has a melt flow index of 10 and a relative molecular weight of 35,000. The talc powder has a median particle size of 2 μm and a top-cut particle size of 10 μm. The carbon black is in powder form.

[0037] Example 3 A high-temperature resistant halogenated flame-retardant polycarbonate insulating film is provided, comprising the following components: 75.5 kg aromatic polycarbonate resin, 15 kg flame retardant (tribromophenoxytetrabromobisphenol A carbonate oligomer), 0.4 kg antioxidant (phenolic antioxidant, phosphite antioxidant), 5 kg toughening agent (3 kg methyl methacrylate and organosilicon polymer, 2 kg ethylene-methyl acrylate copolymer), 0.3 kg release agent (polydimethylsiloxane), 0.3 kg dispersing lubricant (ethylene bis-stearamide), 0.5 kg carbon black, and 3 kg inorganic mineral filler and silane coupling agent (the inorganic mineral filler is talc, and the silane coupling agent is γ-aminopropyltriethoxysilane).

[0038] The aromatic polycarbonate resin has a melt flow index of 10 and a relative molecular weight of 35,000. The talc powder has a median particle size of 2 μm and a top-cut particle size of 10 μm. The carbon black is in powder form.

[0039] Example 4 A high-temperature resistant halogenated flame-retardant polycarbonate insulating film comprises the following components: 71 kg aromatic polycarbonate resin, 15 kg flame retardant (tribromophenoxytetrabromobisphenol A carbonate oligomer), 0.4 kg antioxidant (phosphite antioxidant and phenolic antioxidant), 5 kg toughening agent (polymer composed of 2 kg methyl methacrylate and organosilicon, 3 kg ethylene-methyl acrylate copolymer), 0.3 kg release agent (polydimethylsiloxane), 0.3 kg dispersing lubricant (ethylene bis-stearamide), 0.5 kg carbon black, and 7.5 kg inorganic mineral filler and silane coupling agent (the inorganic mineral filler is talc, and the silane coupling agent is γ-aminopropyltriethoxysilane).

[0040] The aromatic polycarbonate resin has a melt flow index of 10 and a relative molecular weight of 35,000. The talc powder has a median particle size of 2 μm and a top-cut particle size of 10 μm. The carbon black is in powder form.

[0041] Example 5 A high-temperature resistant halogenated flame-retardant polycarbonate insulating film comprises the following components: 71 kg aromatic polycarbonate resin, 15 kg flame retardant (tribromophenoxytetrabromobisphenol A carbonate oligomer), 0.4 kg antioxidant (phosphite antioxidant and phenolic antioxidant), 5 kg toughening agent (2 kg polymer composed of methyl methacrylate and organosilicon, 2 kg ethylene-methyl acrylate copolymer, 1 kg methyl methacrylate-butadiene-styrene terpolymer), 0.3 kg release agent (polydimethylsiloxane), 0.3 kg dispersing lubricant (ethylene bis-stearamide), 0.5 kg carbon black, and 7.5 kg inorganic mineral filler and silane coupling agent (the inorganic mineral filler is talc, and the silane coupling agent is γ-aminopropyltriethoxysilane).

[0042] The aromatic polycarbonate resin has a melt flow index of 10 and a relative molecular weight of 35,000. The talc powder has a median particle size of 2 μm and a top-cut particle size of 10 μm. The carbon black is in powder form.

[0043] Comparative Example 1 Compared to Example 1, the difference is the absence of a flame retardant, while all other conditions are the same.

[0044] Comparative Example 2 Compared with Example 1, the difference is the absence of inorganic mineral filler, while all other conditions are the same.

[0045] Comparative Example 3 Compared with Example 1, the difference is that the toughening agent is only ethylene-methyl acrylate copolymer, while all other conditions are the same.

[0046] Comparative Example 4 The difference from Example 1 is the absence of a silane coupling agent; all other conditions are the same.

[0047] Comparative Example 5 Compared with Example 1, the difference is that the toughening agent is only a polymer composed of methyl methacrylate and organosilicon, while all other conditions are the same.

[0048] Comparative Example 6 Compared to Example 1, the difference is the absence of a toughening agent, while all other conditions are the same.

[0049] Comparative Example 7 Compared with Example 1, the difference is the absence of flame retardant and toughening agent, while all other conditions are the same.

[0050] Comparative Example 8 Compared with Example 1, the difference is the absence of flame retardant and inorganic mineral filler, while all other conditions are the same.

[0051] Comparative Example 9 A high-temperature resistant halogenated flame-retardant polycarbonate insulating film comprises the following components: 76 kg aromatic polycarbonate resin, 10 kg flame retardant (tribromophenoxytetrabromobisphenol A carbonate oligomer), 0.4 kg antioxidant (phenolic antioxidant, phosphite antioxidant), 5 kg toughening agent (polymer composed of 3 kg methyl methacrylate and organosilicon, 2 kg ethylene-methyl acrylate copolymer), 0.3 kg release agent (polydimethylsiloxane), 0.3 kg dispersing lubricant (ethylene bis-stearamide), 0.5 kg carbon black, and 7.5 kg inorganic mineral filler and silane coupling agent (the inorganic mineral filler is talc, and the silane coupling agent is γ-aminopropyltriethoxysilane).

[0052] The aromatic polycarbonate resin has a melt flow index of 10 and a relative molecular weight of 35,000. The talc powder has a median particle size of 2 μm and a top-cut particle size of 10 μm. The carbon black is in powder form.

[0053] Comparative Example 10 A high-temperature resistant halogenated flame-retardant polycarbonate insulating film is provided, comprising the following components: 78.5 kg aromatic polycarbonate resin, 15 kg flame retardant (tribromophenoxytetrabromobisphenol A carbonate oligomer), 0.4 kg antioxidant (phenolic antioxidant, phosphite antioxidant), 2 kg toughening agent (1 kg polymer composed of methyl methacrylate and organosilicon, 1 kg ethylene-methyl acrylate copolymer), 0.3 kg release agent (polydimethylsiloxane), 0.3 kg dispersing lubricant (ethylene bis-stearamide), 0.5 kg carbon black, and 3 kg inorganic mineral filler and silane coupling agent (the inorganic mineral filler is talc, and the silane coupling agent is γ-aminopropyltriethoxysilane).

[0054] The aromatic polycarbonate resin has a melt flow index of 10 and a relative molecular weight of 35,000. The talc powder has a median particle size of 2 μm and a top-cut particle size of 10 μm. The carbon black is in powder form.

[0055] Comparative Example 11 A high-temperature resistant halogenated flame-retardant polycarbonate insulating film is provided, comprising the following components: 70.5 kg aromatic polycarbonate resin, 15 kg flame retardant (tribromophenoxytetrabromobisphenol A carbonate oligomer), 0.4 kg antioxidant (phenolic antioxidant, phosphite antioxidant), 10 kg toughening agent (polymer composed of 3 kg methyl methacrylate and organosilicon, 2 kg ethylene-methyl acrylate copolymer), 0.3 kg release agent (polydimethylsiloxane), 0.3 kg dispersing lubricant (ethylene bis-stearamide), 0.5 kg carbon black, and 3 kg inorganic mineral filler and silane coupling agent (the inorganic mineral filler is talc, and the silane coupling agent is γ-aminopropyltriethoxysilane).

[0056] The aromatic polycarbonate resin has a melt flow index of 10 and a relative molecular weight of 35,000. The talc powder has a median particle size of 2 μm and a top-cut particle size of 10 μm. The carbon black is in powder form.

[0057] Comparative Example 12 A high-temperature resistant halogenated flame-retardant polycarbonate insulating film is provided, comprising the following components: 66.5 kg aromatic polycarbonate resin, 15 kg flame retardant (tribromophenoxytetrabromobisphenol A carbonate oligomer), 0.4 kg antioxidant (phenolic antioxidant, phosphite antioxidant), 5 kg toughening agent (polymer composed of 3 kg methyl methacrylate and organosilicon, 2 kg ethylene-methyl acrylate copolymer), 0.3 kg release agent (polydimethylsiloxane), 0.3 kg dispersing lubricant (ethylene bis-stearamide), 0.5 kg carbon black, and 12 kg inorganic mineral filler and silane coupling agent (the inorganic mineral filler is talc, and the silane coupling agent is γ-aminopropyltriethoxysilane).

[0058] The aromatic polycarbonate resin has a melt flow index of 10 and a relative molecular weight of 35,000. The talc powder has a median particle size of 2 μm and a top-cut particle size of 10 μm. The carbon black is in powder form.

[0059] Comparative Example 13 A high-temperature resistant halogenated flame-retardant polycarbonate insulating film is provided, comprising the following components: 68.5 kg aromatic polycarbonate resin, 15 kg flame retardant (tribromophenoxytetrabromobisphenol A carbonate oligomer), 0.4 kg antioxidant (phenolic antioxidant, phosphite antioxidant), 5 kg toughening agent (polymer composed of 3 kg methyl methacrylate and organosilicon, 2 kg ethylene-methyl acrylate copolymer), 0.3 kg release agent (polydimethylsiloxane), 0.3 kg dispersing lubricant (ethylene bis-stearamide), 0.5 kg carbon black, and 10 kg inorganic mineral filler and silane coupling agent (the inorganic mineral filler is talc, and the silane coupling agent is γ-aminopropyltriethoxysilane).

[0060] The aromatic polycarbonate resin has a melt flow index of 10 and a relative molecular weight of 35,000. The talc powder has a median particle size of 2 μm and a top-cut particle size of 10 μm. The carbon black is in powder form.

[0061] The high-temperature resistant halogenated flame-retardant polycarbonate insulating film was subjected to performance tests, including volume resistivity, flame retardancy rating, tensile strength, breakdown voltage, and heat distortion temperature. The characterization results are shown in Table 1. Table 1. Performance test results of high-temperature halogenated flame-retardant polycarbonate insulating films in Examples 1-5 and Comparative Examples 1-13

[0062] As shown in Table 1, the high-temperature halogenated flame-retardant polycarbonate insulating films of Examples 1-5 significantly improved flame retardancy and heat distortion temperature due to the synergistic effect of flame retardants, inorganic mineral fillers, and silane coupling agents used as flame retardant synergists. Furthermore, the combination of toughening agents and flame retardants further enhanced the flame retardant effect. Films prepared with a single component lacking the high-temperature halogenated flame-retardant polycarbonate insulating film specified in this invention (Comparative Examples 1, 2, 4, and 6) exhibited poor flame retardant effects, while films prepared with multiple components lacking the high-temperature halogenated flame-retardant polycarbonate insulating film specified in this invention (Comparative Examples 7 and 8) showed even worse effects. Therefore, this invention achieves a significant improvement in flame retardancy and heat distortion temperature through the synergistic effect between the components.

[0063] Flame-retardant films prepared by using flame retardants that are not within the scope of this invention (Comparative Example 9), toughening agents that are not within the scope of this invention (Comparative Example 10), or inorganic mineral fillers and silane coupling agents that are not within the scope of this invention (Comparative Example 12) will also have a certain impact on their flame-retardant effect.

[0064] In summary, the high-temperature halogenated flame-retardant polycarbonate insulating film provided by this invention utilizes bromine-based flame retardants, inorganic mineral fillers, and silane coupling agents as flame-retardant synergists, and adjusts their ratio to achieve a synergistic effect, thereby achieving the purpose of flame retardancy of polycarbonate and increasing its heat distortion temperature. Specifically, the tribromophenoxytetrabromobisphenol A carbonate oligomer decomposes upon heating to generate HBr, which can capture active free radicals that propagate the combustion chain reaction, generating less reactive bromine free radicals, thus slowing down or stopping combustion. The flame-retardant HBr and the water vapor generated by the reaction not only dilute oxygen in the air but also cover the surface of the aromatic polycarbonate resin matrix, isolating it from contact with oxygen, reducing the combustion rate of the aromatic polycarbonate resin matrix, or causing it to self-extinguish. Talc powder can release a large amount of water vapor at high temperatures, absorbing heat and lowering the temperature during combustion, thereby slowing the spread of fire and playing a flame-retardant role. The addition of tribromophenoxytetrabromobisphenol A carbonate oligomer and talc powder increases the heat distortion temperature of the aromatic polycarbonate resin.

[0065] Meanwhile, the polymer composed of ethylene-methyl acrylate copolymer, methyl methacrylate, and organosilicon, along with the brominated flame retardant, exhibits a synergistic flame-retardant effect. Specifically, when the silicone-based toughening agent burns, it generates an inorganic thermal insulation protective layer unique to silicone, containing -Si-O and -Si-C bonds. This layer prevents the escape of combustion decomposition products and inhibits the thermal decomposition of the polymer material, as well as suppressing the volatilization of large amounts of toxic and corrosive gases produced by the brominated flame retardant. Through the compounding technology of ethylene-methyl acrylate copolymer and the silicone-based toughening agent methyl methacrylate and the silicone-based polymer, the physical properties of the polycarbonate film are improved without affecting its flame retardancy. The high-temperature halogenated flame-retardant polycarbonate insulating film prepared by this invention achieves UL94V0 flame retardancy at a thickness of 0.05-0.25 mm.

[0066] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A high-temperature resistant halogenated flame-retardant polycarbonate insulating film, characterized in that, It includes the following components by weight percentage: 65-80% aromatic polycarbonate resin, 15%-40% flame retardant, 3%-5% toughening agent, 0.1%-1% antioxidant, 0.1-0.8% release agent, 0.1-1% dispersing lubricant, 0.5-1.2% carbon black, and 0.5-10% inorganic mineral filler and silane coupling agent; The flame retardant is a bromine-based flame retardant; the inorganic mineral filler is one or more of the following: flaky montmorillonite, kaolin, bentonite, mica powder, or talc powder. The weight ratio of the flame retardant to the inorganic mineral filler to the silane coupling agent is 1:(0.1-0.5). The toughening agent is a mixture of a polymer composed of methyl methacrylate and organosilicon, and an ethylene-methyl methacrylate copolymer; the polymer composed of methyl methacrylate and organosilicon is designated as Mitsubishi S2001.

2. The high-temperature resistant halogenated flame-retardant polycarbonate insulating film as described in claim 1, characterized in that, The flame retardant is tribromophenoxytetrabromobisphenol A carbonate oligomer; the inorganic mineral filler is talc; and the silane coupling agent is γ-aminopropyltriethoxysilane.

3. The high-temperature resistant halogenated flame-retardant polycarbonate insulating film as described in claim 1, characterized in that, The weight ratio of the flame retardant to the toughening agent is 1:(0.1-0.6).

4. The high-temperature resistant halogenated flame-retardant polycarbonate insulating film as described in claim 3, characterized in that, The aromatic polycarbonate resin has a melt flow index of 5-15 and a relative molecular weight of 25,000-40,000.

5. The high-temperature resistant halogenated flame-retardant polycarbonate insulating film as described in claim 4, characterized in that, The antioxidant is one or more of phenolic antioxidants, phosphite antioxidants, and organosulfur antioxidants.

6. The high-temperature resistant halogenated flame-retardant polycarbonate insulating film as described in claim 5, characterized in that, The release agent is one or more of polydimethylsiloxane, polyethylene wax, and polyethylene glycol, and the dispersing lubricant is one or more of oleamide, erucamide, stearamide, and ethylene bis-stearamide.

7. The method for preparing the high-temperature resistant halogenated flame-retardant polycarbonate insulating film according to any one of claims 1-6, characterized in that, Includes the following steps: a. Thoroughly dry the aromatic polycarbonate resin, flame retardant, toughening agent, antioxidant, release agent, dispersant lubricant, carbon black, inorganic mineral filler, and silane coupling agent until the moisture content is below 0.02%; b. Weigh the dried aromatic polycarbonate resin, flame retardant, toughening agent, antioxidant, release agent, dispersing lubricant, carbon black, inorganic mineral filler and silane coupling agent according to the formula and mix them evenly in a mixer to obtain a mixture; c. The mixture obtained in step b is used to prepare polycarbonate composite plastic particles through a twin-screw granulator; the temperature of the twin-screw granulator is 230-270℃ and the screw speed is 200-400r / min; d. Dry the prepared polycarbonate composite plastic particles for 4-8 hours at a temperature of 115℃-125℃. e. The dried polycarbonate composite plastic particles from step d are added to a sheet extruder and calendered using a three-roll mill to produce a film with a thickness of 0.05–0.25 mm, thus obtaining a high-temperature resistant halogenated flame-retardant polycarbonate insulating film. The temperature of the sheet extruder is 240–275 °C.

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