High-impact-resistance thin-wall flame-retardant polycarbonate material and preparation method thereof

Abstract

The invention discloses a high-impact-resistance thin-wall flame-retardant polycarbonate material, which is prepared from the following raw material components in parts by mass: 84.5 to 95 parts of polycarbonate, 0.5 to 1.5 parts of sulfonate flame retardant, 2 to 5 parts of phosphorus flame retardant, 1 to 5 parts of aminated polyacrylonitrile, 0.1 to 1 part of mesocarbon microbeads, 1 to 5 parts of toughening agent and 0.1 to 0.5 part of antioxidant, wherein the notch impact strength of the polycarbonate is greater than or equal to 80kJ / m < 2 >, and the melt index of the polycarbonate is 0.5-3g / 10min under the test conditions of 300 DEG C and 1.2 kg. According to the high-impact-resistance, thin-wall and flame-retardant polycarbonate material and the preparation method thereof, the high-impact-resistance, thin-wall and flame-retardant polycarbonate material has excellent stability and flame retardance and has wide application scenes.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high-impact, thin-walled flame-retardant polycarbonate material and a preparation method thereof. Background Art

[0002] In the prior art, flame retardant polycarbonate materials are generally prepared by adding perfluorinated or polyfluorinated flame retardants or phosphate ester and its derivative flame retardants to polycarbonate raw materials, thereby making the polycarbonate materials have flame retardant properties.

[0003] However, per- and poly-fluoroalkyl substances (PFAS) are gradually banned by a number of environmental regulations, which greatly limits the application of flame-retardant polycarbonate materials made from them. Since phosphate ester and its derivative flame retardants contain phosphate ester components and are easily hydrolyzed, flame-retardant polycarbonate materials made from them are prone to degradation in a double 85 environment, resulting in a decrease in flame retardancy.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a high-impact, thin-walled flame-retardant polycarbonate material and a preparation method thereof, which has excellent stability and flame retardancy and has a wide range of application scenarios.

[0006] In order to achieve the above-mentioned purpose, a technical solution provided by a specific embodiment of the present invention is as follows: a high-impact, thin-walled flame-retardant polycarbonate material, comprising the following raw material components by weight: 84.5-95 parts of polycarbonate, 0.5-1.5 parts of sulfonate flame retardant, 2-5 parts of phosphorus flame retardant, 1-5 parts of aminated polyacrylonitrile, 0.1-1 parts of mesophase carbon microspheres, 1-5 parts of toughening agent and 0.3 parts of antioxidant;

[0007] Wherein, the notched impact strength of the polycarbonate is greater than or equal to 80 kJ / m 2 Under the test conditions of 300° C. and 1.2 kg, the melt index of the polycarbonate is 0.5 to 3 g / 10 min.

[0008] In one or more embodiments of the present invention, the sulfonate flame retardant includes at least one of potassium diphenyl sulfone sulfonate and zinc p-toluene sulfonate.

[0009] In one or more embodiments of the present invention, the amino functionality of the aminated polyacrylonitrile is 10% to 20%.

[0010] In one or more embodiments of the present invention, the phosphorus-based flame retardant includes at least one of hexaphenoxy cyclotriphosphazene, a bicyclic caged phosphate derivative, and a bicyclic caged phosphate siloxane.

[0011] In one or more embodiments of the present invention, under the test conditions of 300° C. and 1.2 kg, the melt index of the polycarbonate is 2 g / 10 min.

[0012] In one or more embodiments of the present invention, the D50 particle size of the mesocarbon microspheres is 13-16 μm, and the compacted density is 1.5-1.6 g / cm 3 .

[0013] In one or more embodiments of the present invention, the antioxidant includes at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and tris[2,4-di-tert-butylphenyl]phosphite.

[0014] In one or more embodiments of the present invention, the toughening agent includes an organosilicon toughening agent.

[0015] In one or more embodiments of the present invention, the organosilicon toughening agent is an organosilicon-acrylic core-shell toughening agent.

[0016] A specific embodiment of the present invention also provides a method for preparing a high-impact, thin-walled, flame-retardant polycarbonate material, comprising the following steps:

[0017] The above raw materials are stirred and mixed uniformly according to proportion to obtain a premix;

[0018] The premix is ​​melt-extruded at 230-250° C., cooled, pelletized and dried to obtain the high-impact, thin-wall flame-retardant polycarbonate material.

[0019] Compared with the prior art, the high impact resistant, thin-walled flame retardant polycarbonate material and the preparation method thereof of the present invention have the following beneficial effects:

[0020] (1) A compound flame retardant is formed by using fluorine-free and halogen-free sulfonate flame retardant and phosphorus-based flame retardant, and then combined with aminated polyacrylonitrile (N-PAN) to form PNS synergistic flame retardant, so that the high impact resistance, thin-wall flame retardant polycarbonate material can achieve a good carbonization effect during combustion. N-PAN introduces NH2- on the PAN molecular chain, and can also be used as a gas source to form a synergistic effect with the above-mentioned carbonization effect during combustion to form an expanded carbon layer, thereby improving the flame retardant efficiency;

[0021] (2) Introducing mesophase carbon microspheres into the raw material formula, taking advantage of their high specific surface area and high thermal conductivity, can quickly dissipate the combustion heat during combustion, thereby reducing the combustion heat and achieving the purpose of flame retardancy;

[0022] (3) The use of a fluorine-free and halogen-free flame retardant system makes the application of the high-impact, thin-walled flame-retardant polycarbonate material of the present invention more extensive;

[0023] (4) The notched impact strength of the preferred polycarbonate is greater than or equal to 80 kJ / m 2 Under the test conditions of 300°C and 1.2kg, the melt index of the polycarbonate is 0.5-3g / 10min, so that the high-impact, thin-walled flame-retardant polycarbonate material of the present invention can have high impact resistance, reduce the amount of toughening agent used, and avoid the decrease in flame retardancy of the material due to excessive amount of toughening agent. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] A high impact resistant, thin-walled flame retardant polycarbonate material in an example of the present invention comprises the following raw material components by weight: 84.5-95 parts of polycarbonate, 0.5-1.5 parts of sulfonate flame retardant, 2-5 parts of phosphorus flame retardant, 1-5 parts of aminated polyacrylonitrile, 0.1-1 parts of mesophase carbon microspheres, 1-5 parts of toughening agent and 0.3 parts of antioxidant;

[0026] Among them, the notched impact strength of polycarbonate is greater than or equal to 80kJ / m 2 Under the test conditions of 300° C. and 1.2 kg, the melt index of the polycarbonate is 0.5 to 3 g / 10 min.

[0027] It is understood that the notched impact strength of polycarbonate is greater than or equal to 80 kJ / m 2 , and under the test conditions of 300°C and 1.2kg, the melt index of the polycarbonate is 0.5-3g / 10min. The above definition can make the polycarbonate have excellent impact resistance, thereby improving the impact resistance of the high impact resistance, thin-wall flame retardant polycarbonate material of the present invention.

[0028] Preferably, the sulfonate flame retardant includes at least one of potassium diphenylsulfone sulfonate (KSS) and zinc p-toluene sulfonate. Specifically, potassium diphenylsulfone sulfonate can be FR308 sold by Shanghai Puxin Polymer.

[0029] Preferably, the phosphorus flame retardant includes at least one of hexaphenoxy cyclotriphosphazene (HPCTP), bicyclic caged phosphate derivatives, and bicyclic caged phosphate siloxane. Specifically, the hexaphenoxy cyclotriphosphazene can be the hexaphenoxy cyclotriphosphazene sold by Weihai Jinwei Chemical, with an effective phosphorus content of ≥15%.

[0030] Preferably, under the test conditions of 300° C. and 1.2 kg, the melt index of the polycarbonate is 1 to 3 g / 10 min.

[0031] Preferably, under the test conditions of 300°C and 1.2 kg, the melt index MFR of the polycarbonate is 2 g / 10 min. For example, the polycarbonate may be 7030PJ sold by Mitsubishi Chemical Polycarbonate of Japan, and its notched impact strength is 88 kJ / m 2 , under the test conditions of 300°C and 1.2kg, its melt index is 2g / 10min. For example, the polycarbonate can be Teijin's K-1300Y, whose notched impact strength is 89kJ / m 2 , under the test conditions of 300℃ and 1.2kg, its melt index is 3g / 10min.

[0032] Preferably, the amino functionality of the aminated polyacrylonitrile is 10% to 20% (molar percentage).

[0033] Specifically, the preparation method of aminated polyacrylonitrile (N-PAN) can be:

[0034] At 80°C, PAN (polyacrylonitrile (which can be directly purchased on the market)) powder is first hydrolyzed with a 1.5 mol / L NaOH solution, and then fully washed with dilute hydrochloric acid and deionized water. The hydrolyzed PAN is added to a 1,6-hexanediamine solution with a concentration of 8% (mass percentage) at room temperature and mixed for 1 hour, and then rinsed and filtered with deionized water for multiple times to remove excess alkali solution to obtain N-PAN (used in the following examples and comparative examples).

[0035] Specifically, the D50 particle size of the mesophase carbon microspheres is 13-16 μm, and the compacted density is 1.5-1.6 g / cm 3 .

[0036] Preferably, the antioxidant includes at least one of tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester and tris[2,4-di-tert-butylphenyl]phosphite. Tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythritol ester is antioxidant 1010 (which can be directly purchased on the market); tris[2,4-di-tert-butylphenyl]phosphite is antioxidant 168 (which can be directly purchased on the market).

[0037] Preferably, the toughening agent includes an organosilicon toughening agent. Specifically, the organosilicon toughening agent is an organosilicon-acrylic core-shell toughening agent. For example, the organosilicon-acrylic core-shell toughening agent can be S-2030 sold by Mitsubishi Chemical of Japan.

[0038] A specific example of the present invention also provides a method for preparing a high-impact, thin-walled flame-retardant polycarbonate material, comprising the following steps:

[0039] The above raw materials are stirred and mixed uniformly according to proportion to obtain a premix;

[0040] The premix is ​​melt-extruded at 230-250° C., cooled, pelletized and dried to obtain the high-impact, thin-wall flame-retardant polycarbonate material.

[0041] The high impact resistance, thin-wall flame retardant polycarbonate material and its preparation method of the present invention will be described in detail below in conjunction with specific examples and comparative examples.

[0042] 89.6 parts of polycarbonate resin (7030PJ from Mitsubishi Chemical of Japan), 0.5 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.1 parts of zinc p-toluenesulfonate, 5 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 2 parts of N-PAN, 0.5 parts of mesophase carbon microspheres (MCMB), 2 parts of silicone toughening agent (S-2030 from Mitsubishi Chemical of Japan), 0.1 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 were mixed evenly with a high-speed mixer to obtain a premix.

[0043] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., the high-impact, thin-wall flame-retardant polycarbonate material is obtained.

[0044] Example 2

[0045] 89.3 parts of polycarbonate resin (7030PJ from Mitsubishi Chemical of Japan), 0.5 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.1 parts of zinc p-toluenesulfonate, 5 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 2 parts of N-PAN, 0.8 parts of mesophase carbon microspheres (MCMB), 2 parts of silicone toughening agent (S-2030 from Mitsubishi Chemical of Japan), 0.1 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 were mixed evenly with a high-speed stirrer to obtain a premix.

[0046] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., the high-impact, thin-wall flame-retardant polycarbonate material is obtained.

[0047] Example 3

[0048] 88.1 parts of polycarbonate resin (7030PJ from Mitsubishi Chemical of Japan), 0.5 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.1 parts of zinc p-toluenesulfonate, 5 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 3 parts of N-PAN, 1 part of mesophase carbon microspheres (MCMB), 2 parts of silicone toughening agent (S-2030 from Mitsubishi Chemical of Japan), 0.1 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 were mixed evenly with a high-speed mixer to obtain a premix.

[0049] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., the high-impact, thin-wall flame-retardant polycarbonate material is obtained.

[0050] Example 4

[0051] 88.4 parts of polycarbonate resin (7030PJ from Mitsubishi Chemical of Japan), 0.5 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.3 parts of zinc p-toluenesulfonate, 5 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 3 parts of N-PAN, 0.5 parts of mesophase carbon microspheres (MCMB), 2 parts of silicone toughening agent (S-2030 from Mitsubishi Chemical of Japan), 0.1 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 were mixed evenly with a high-speed mixer to obtain a premix.

[0052] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., the high-impact, thin-wall flame-retardant polycarbonate material is obtained.

[0053] Example 5

[0054] 84.5 parts of polycarbonate resin (7030PJ from Mitsubishi Chemical of Japan), 1 part of KSS (FR308 sold by Shanghai Puxin Polymer), 0.5 parts of zinc p-toluenesulfonate, 5 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 5 parts of N-PAN, 0.8 parts of mesophase carbon microspheres (MCMB), 2 parts of silicone toughening agent (S-2030 from Mitsubishi Chemical of Japan), 0.1 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 were mixed evenly with a high-speed mixer to obtain a premix.

[0055] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., the high-impact, thin-wall flame-retardant polycarbonate material is obtained.

[0056] Example 6

[0057] 95 parts of polycarbonate resin (Teijin's K-1300Y), 0.4 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.1 parts of zinc p-toluenesulfonate, 2 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 1 part of N-PAN, 0.8 parts of mesophase carbon microspheres (MCMB), 1 part of silicone toughening agent (S-2030 from Mitsubishi Chemical of Japan), and 0.1 parts of antioxidant 1010 were mixed evenly with a high-speed stirrer to obtain a premix.

[0058] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., the high-impact, thin-wall flame-retardant polycarbonate material is obtained.

[0059] Example 7

[0060] 88.4 parts of polycarbonate resin (7030PJ from Mitsubishi Chemical of Japan), 0.5 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.3 parts of zinc p-toluenesulfonate, 4.5 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 3 parts of N-PAN, 0.5 parts of mesophase carbon microspheres (MCMB), 5 parts of silicone toughening agent (S-2030 from Mitsubishi Chemical of Japan), 0.2 parts of antioxidant 1010 and 0.3 parts of antioxidant 168 were mixed evenly with a high-speed mixer to obtain a premix.

[0061] The uniformly mixed premix is ​​added through the main feed port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing, and drying at 230-250° C., the high-impact, thin-walled, flame-retardant polycarbonate material is obtained.

[0062] 89.6 parts of polycarbonate resin (7030PJ from Mitsubishi Chemical of Japan), 0.5 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.1 parts of zinc p-toluenesulfonate, 2 parts of N-PAN, 0.5 parts of mesophase carbon microspheres (MCMB), 2 parts of silicone toughening agent (S-2030 from Mitsubishi Chemical of Japan), 0.1 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 were mixed evenly with a high-speed mixer to obtain a premix.

[0063] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., a flame-retardant polycarbonate material is obtained.

[0064] Comparative Example 2

[0065] 89.6 parts of polycarbonate resin (7030PJ from Mitsubishi Chemical of Japan), 0.5 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.1 parts of zinc p-toluenesulfonate, 5 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 2 parts of PAN (polyacrylonitrile available on the market), 0.5 parts of mesophase carbon microspheres (MCMB), 2 parts of silicone toughening agent (S-2030 from Mitsubishi Chemical of Japan), 0.1 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 were mixed evenly with a high-speed mixer to obtain a premix.

[0066] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., a flame-retardant polycarbonate material is obtained.

[0067] Comparative Example 3

[0068] 89.6 parts of polycarbonate resin (7030PJ from Mitsubishi Chemical of Japan (with a notched impact strength of 78 kJ / m 2 , under the test conditions of 300°C and 1.2kg, its melt index is 2g / 10min)), 0.5 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.1 parts of zinc p-toluenesulfonate, 5 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 2 parts of N-PAN, 2 parts of silicone toughening agent (S-2030 of Mitsubishi Chemical of Japan), 0.1 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 were mixed evenly by a high-speed mixer to obtain a premix.

[0069] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., a flame-retardant polycarbonate material is obtained.

[0070] Comparative Example 4

[0071] 89.6 parts of polycarbonate resin (3026B from Mitsubishi Chemical of Japan), 0.5 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.1 parts of zinc p-toluenesulfonate, 5 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 2 parts of N-PAN, 0.5 parts of mesophase carbon microspheres (MCMB), 2 parts of silicone toughening agent (S-2030 from Mitsubishi Chemical of Japan), 0.1 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 were mixed evenly with a high-speed mixer to obtain a premix.

[0072] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., the high-impact, thin-wall flame-retardant polycarbonate material is obtained.

[0073] Comparative Example 5

[0074] 88.4 parts of polycarbonate resin (7030PJ from Mitsubishi Chemical of Japan), 0.5 parts of KSS (FR308 sold by Shanghai Puxin Polymer), 0.3 parts of zinc p-toluenesulfonate, 5 parts of HPCTP (hexaphenoxycyclotriphosphazene sold by Weihai Jinwei Chemical), 3 parts of N-PAN, 0.5 parts of mesophase carbon microspheres (MCMB), 0.1 parts of antioxidant 1010 and 0.2 parts of antioxidant 168 were mixed evenly with a high-speed stirrer to obtain a premix.

[0075] The uniformly mixed premix is ​​added through the main feeding port of a twin-screw extruder, and after melt extrusion, cooling, pelletizing and drying at 230-250° C., the high-impact, thin-wall flame-retardant polycarbonate material is obtained.

[0076] The high impact resistance, thin-wall flame retardant polycarbonate materials prepared in the above Examples 1 to 7 and the flame retardant polycarbonate materials prepared in Comparative Examples 1 to 5 were subjected to the following treatments and performance tests:

[0077] Test specimen preparation:

[0078] The high impact resistant, thin-walled flame retardant polycarbonate materials of the above-mentioned embodiments and the flame retardant polycarbonate materials of the comparative examples were dried in a blast dryer at 120° C. for 4 hours and then injection molded into standard specimens at an injection molding temperature of 270-300° C. The prepared mechanical properties specimens were tested after conditioning for 24 hours under a standard laboratory environment (23° C., 50% RH).

[0079] (1) Tensile strength: According to ISO527-2 standard, the test rate is 50 mm / min;

[0080] (2) Flexural strength: According to IS178 standard, the span is 64 mm and the test rate is 2 mm / min;

[0081] (3) Flexural modulus: According to IS178 standard, the span is 64 mm and the test rate is 2 mm / min;

[0082] (4) Notched impact strength: tested on a simply supported beam impact tester in accordance with ISO 179-1 standard, with the notch of the specimen being type A, and tested at room temperature (23°C).

[0083] (5) Flame retardancy: tested in a DRK-310 horizontal vertical combustion tester according to the UL94 vertical combustion standard test method, with a test specimen thickness of 0.5 mm;

[0084] (6) Oxygen index: tested according to the standard method of GB / T2406, using 80×10×4mm specimens;

[0085] (7) Notched impact strength after hygrothermal aging: Prepare standard notched impact specimens and place them in a constant temperature and humidity chamber at 85°C and 85% RH for 1000 h. After the test, test the notched impact strength of the material.

[0086] (8) Flame retardant properties after wet heat aging: Prepare standard flame retardant specimens (same as test (6)) and place them in a constant temperature and humidity chamber at 85°C and 85% RH for 1000 h. After the test, test the flame retardant properties of the material specimens.

[0087] The test data is shown in Table 1:

[0088] Table 1: Performance test data

[0089]

[0090] From the material performance data of Examples 1 to 7 in Table 1, the use of sulfonate and phosphazene compound flame retardants, combined with N-PAN carbon former and MCMB to form PSN synergistic flame retardant can make the flame retardant PC reach a flame retardant level of 0.5mm (V0).

[0091] With the increase of N-PAN and MCMB content, the oxygen index of the system also gradually increases, indicating that the introduction of N-PAN and MCMB can quickly form carbon during the combustion process. MCMB, with its high specific surface area and thermal conductivity, can quickly dissipate part of the combustion heat, play a role in reducing the combustion temperature, and enhance the flame retardant properties of the system.

[0092] The traditional method of flame retardant PC is mainly to use sulfonate and organosilicon flame retardant synergistically. This flame retardant system is difficult to achieve V0 flame retardancy for thin walls (less than 0.8 mm). However, in terms of long-term aging, after double 85 high temperature and high humidity aging, Examples 1 to 7 all maintain V0 flame retardancy and have good aging resistance.

[0093] In terms of mechanical properties, it can be seen from the examples that the addition of N-PAN and MCMB does not significantly affect the mechanical properties of the flame retardant polycarbonate. It can also be seen from Example 1 and Comparative Example 4 that the use of the preferred specific polycarbonate (notched impact strength greater than or equal to 80 kJ / m 2 Under the test conditions of 300°C and 1.2kg, the melt index of the polycarbonate is 0.5-3g / 10min). Combined with the silicone toughening agent, the flame-retardant PC maintains high tensile, bending and notched impact strengths, especially the notched impact strength still has a high retention rate after double 85 aging.

[0094] It can be seen from Example 1 and Comparative Example 4 that the specific polycarbonate raw material (notched impact strength greater than or equal to 80 kJ / m 2 Under the test conditions of 300°C and 1.2kg, the melt index of the polycarbonate is 0.5-3g / 10min). Although it does not affect the flame retardant properties, the mechanical properties of the high-impact, thin-walled flame-retardant polycarbonate material obtained by selecting a specific polycarbonate raw material are better than those of the high-impact, thin-walled flame-retardant polycarbonate material obtained by selecting an ordinary polycarbonate raw material, that is, the high-impact, thin-walled flame-retardant polycarbonate material obtained by selecting a specific polycarbonate raw material has high impact resistance.

[0095] The high-impact, thin-walled flame-retardant polycarbonate material prepared by the present invention can have both high impact resistance and high flame retardancy, and achieve ternary synergistic flame retardancy with PSN, especially without using fluorine-containing and phosphate flame retardant systems. It not only conforms to the concept of green environmental protection, but also the prepared flame-retardant PC material has excellent mechanical properties, and is not easy to degrade, especially in high temperature and high humidity environments, and can be applied to new energy vehicles, electronic and electrical fields.

[0096] The high impact resistance, thin-wall flame retardant polycarbonate material and the preparation method thereof of the present invention have the following beneficial effects:

[0097] (1) A compound flame retardant is formed by using fluorine-free and halogen-free sulfonate flame retardant, synergistic flame retardant and phosphazene derivatives, and then combined with aminated polyacrylonitrile (N-PAN), so that the high impact resistance, thin-wall flame retardant polycarbonate material can achieve a good carbonization effect during combustion. N-PAN introduces NH2- on the PAN molecular chain, and can also be used as a gas source to form a synergistic effect with the above carbonization effect during combustion to form an expanded carbon layer, thereby improving the flame retardant efficiency;

[0098] (2) Introducing mesophase carbon microspheres into the raw material formula, taking advantage of their high specific surface area and high thermal conductivity, can quickly dissipate the heat of combustion during combustion, thereby reducing the heat of combustion and achieving the purpose of flame retardancy.

[0099] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

[0100] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high impact resistant, thin wall flame retardant polycarbonate material, characterized in that: The raw material components include, by weight: 84.5-95 parts of polycarbonate, 0.5-1.5 parts of sulfonate flame retardant, 2-5 parts of phosphorus flame retardant, 1-5 parts of aminated polyacrylonitrile, 0.1-1 parts of mesophase carbon microspheres, 1-5 parts of toughening agent and 0.1-0.5 parts of antioxidant; Wherein, the notched impact strength of the polycarbonate is greater than or equal to 80 kJ / m 2 Under the test conditions of 300° C. and 1.2 kg, the melt index of the polycarbonate is 0.5 to 3 g / 10 min.

2. The high impact resistant, thin wall flame retardant polycarbonate material according to claim 1, characterized in that: The sulfonate flame retardant includes at least one of potassium diphenylsulfone sulfonate and zinc p-toluene sulfonate.

3. The high impact resistant, thin wall flame retardant polycarbonate material according to claim 1, characterized in that: The amino functionality of the aminated polyacrylonitrile is 10% to 20%.

4. The high impact resistant, thin wall flame retardant polycarbonate material according to claim 1, characterized in that: The phosphorus-based flame retardant includes at least one of hexaphenoxy cyclotriphosphazene, a bicyclic caged phosphate derivative, and a bicyclic caged phosphate siloxane.

5. The high impact resistant, thin wall flame retardant polycarbonate material according to claim 1, characterized in that: Under the testing conditions of 300° C. and 1.2 kg, the melt index of the polycarbonate is 2 g / 10 min.

6. The high impact resistant, thin wall flame retardant polycarbonate material according to claim 1, characterized in that: The D50 particle size of the mesophase carbon microspheres is 13-16 μm, and the compacted density is 1.5-1.6 g / cm 3 .

7. The high impact resistant, thin wall flame retardant polycarbonate material according to claim 1, characterized in that: The antioxidant includes at least one of pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate and tris[2,4-di-tert-butylphenyl]phosphite.

8. The high impact resistant, thin wall flame retardant polycarbonate material according to claim 1, characterized in that: The toughening agent includes an organosilicon toughening agent.

9. The high impact resistant, thin wall flame retardant polycarbonate material according to claim 8, characterized in that: The organosilicon toughening agent is an organosilicon-acrylic acid core-shell toughening agent.

10. A method for preparing a high impact resistant, thin-walled flame retardant polycarbonate material, characterized in that: The following steps are involved: Stir and mix the raw materials according to any one of claims 1 to 9 in proportion to obtain a premix; The premix is ​​melt-extruded at 230-250° C., cooled, pelletized and dried to obtain the high-impact, thin-wall flame-retardant polycarbonate material.

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