Insulating flame-retardant polycarbonate composition and use thereof

Abstract

The present invention relates to the technical field of high polymer materials, and disclosed are an insulating flame-retardant polycarbonate composition and a use thereof. According to the polycarbonate composition of the present invention, by means of cooperation of specific types of a voltage stabilizer and a dispersing agent, the CTI electrical properties of a product can be effectively improved, the requirement of CTI 300 V≥50 drops is satisfied, thereby achieving excellent flame retardance; and additionally, enough normal-temperature toughness and low-temperature toughness are achieved, and the polycarbonate composition can be fully applied to the field of new energy.

Description

Insulating flame-retardant polycarbonate composition and application thereof Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to an insulating and flame-retardant polycarbonate composition and application thereof. Background Art

[0002] As electronic devices used in the new energy sector become increasingly miniaturized and thinner, supporting plastic components (such as the housings and protective baffles in photovoltaic connectors or new energy charging stations / chargers) are increasingly required to exhibit superior electrical insulation, flame retardancy, and heat resistance. Polycarbonate is a frequently used material in the new energy sector, but currently only meets the CTI requirement of 175V ≥ 50 drops and rapidly fails (≤ 20 drops) when the voltage rises to 300V.

[0003] Although some products introduce a large amount of electrical performance modifiers into their components to improve the electrical properties of the products, most of these components will affect the mechanical properties of the products, especially the low-temperature toughness, which greatly limits the scope of use of the products.

[0004] Summary of the Invention

[0005] Based on the defects of the existing technology, the purpose of the present invention is to provide an insulating flame-retardant polycarbonate composition. This product, through the combination of specific types of voltage stabilizers and dispersants, can not only effectively improve the product's CTI electrical performance, making CTI300V≥50 drops, but also has excellent flame retardant properties. At the same time, it has sufficient room temperature and low temperature toughness, and can be fully applied in the new energy field.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] An insulating flame-retardant polycarbonate composition comprises the following components in parts by weight:

[0008] 55-95 parts of polycarbonate, 1-20 parts of toughening agent, 1-20 parts of flame retardant, 0.01-10 parts of voltage stabilizer, 0.01-1 part of dispersant and 0.1-5 parts of anti-dripping agent;

[0009] The voltage stabilizer is at least one of anthraquinone and anthraquinone derivatives;

[0010] The dispersant is oxidized polyethylene wax with an acid value of 10 to 40 mgKOH / mol.

[0011] Preferably, the acid value of the dispersant is 15 to 35 mgKOH / mol.

[0012] Preferably, the insulating flame-retardant polycarbonate composition comprises the following components in parts by weight:

[0013] 60-90 parts of polycarbonate, 1-20 parts of toughening agent, 3-18 parts of flame retardant, 0.1-8 parts of voltage stabilizer, 0.01-1 part of dispersant and 0.1-5 parts of anti-dripping agent.

[0014] In traditional polycarbonate compositions, modifiers used to modify their electrical properties often have compatibility issues. The main reason is that these modifiers are generally small molecules and cannot effectively adhere to polycarbonate, which is amorphous and has a looser morphological structure than other plastics. As a result, migration or even precipitation occurs, which not only causes appearance problems but may also affect the mechanical properties of the product. On the other hand, due to the high carbonization structure of polycarbonate, although it has good self-extinguishing flame retardancy, the carbon circuit after carbonization is easily conductive under an applied voltage, making electrical tracking failure faster than other plastic systems. Therefore, in the polycarbonate composition of the present invention, anthraquinone or its derivatives are used as voltage stabilizers. Such substances are well compatible with polycarbonate based on their special phenyl structure. At the same time, they are combined with oxidized polyethylene wax having hydroxyl or carboxyl groups to more effectively improve the uniform dispersion of the components. Under the combined action of the two, anthraquinone or its derivatives can give full play to the stability of the applied voltage, greatly enhance the trapping effect on charge carriers, improve the charge transport performance, and reduce the local concentrated conduction of charges caused by structural defects of the polycarbonate without reducing the flame retardancy of the product. In addition, the use of this component can ensure that the product has sufficient mechanical properties, especially room temperature and low temperature toughness. At -30°C, the product can achieve 250J / m 2 Above impact strength.

[0015] Regarding the selection of dispersant types, the inventors found that when the acid value of the dispersant is less than 10 mgKOH / mol, the carboxyl or hydroxyl content it contains is insufficient, making it difficult for it to achieve a joint effect with the voltage stabilizer. If the acid value is higher than 40 mgKOH / mol, the compatibility of the dispersant with polycarbonate becomes low, which not only leads to poor toughness performance of the product, but may even cause circuit conduction due to the enhanced antistatic properties of this component, resulting in poor CTI electrical performance of the product.

[0016] Preferably, the weight percentage of the polycarbonate is 60 parts, 65 parts, 70 parts, 72 parts, 76 parts, 78 parts, 80 parts, 85 parts, 90 parts or any two of the range values; the weight percentage of the toughening agent is 1 part, 5 parts, 12 parts, 15 parts, 18 parts, 20 parts or any two of the range values; the weight percentage of the flame retardant is 3 parts, 5 parts, 12 parts, 15 parts, 18 parts or any two of the range values; the weight percentage of the voltage stabilizer is 0.1 parts, 0.5 The weight portion of the dispersant is in the range of 0.01 part, 0.05 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.8 part, 1 part or any two of the range values; the weight portion of the anti-dripping agent is in the range of 0.1 part, 0.5 part, 0.6 part, 1 part, 2 parts, 3 parts, 4 parts, 5 parts or any two of the range values;

[0017] Preferably, the polycarbonate composition comprises the following components in parts by weight:

[0018] 70-80 parts of polycarbonate, 4-15 parts of toughening agent, 5-15 parts of flame retardant, 0.5-5 parts of voltage stabilizer, 0.05-0.8 parts of dispersant, and 0.3-1 parts of anti-drip agent. More preferably, the weight percentage of the voltage stabilizer is 2-4 parts, and the weight percentage of the dispersant is 0.1-0.5 parts.

[0019] More preferably, in the polycarbonate composition, the mass percentage of polycarbonate is ≥50 wt%.

[0020] Preferably, the anthraquinone derivative includes at least one of hydroxyanthraquinone, aminoanthraquinone and dianthraquinone.

[0021] More preferably, the hydroxyanthraquinone is 2-hydroxyanthraquinone, and the aminoanthraquinone is 2,6-diaminoanthraquinone.

[0022] Similar to anthraquinone, the anthraquinone derivative has a special phenyl structure and electrical performance improving functional groups. Compared with other electrical performance modifiers, it has specificity and can be used specifically to improve the CTI performance of polycarbonate products without reducing the flame retardancy and mechanical properties of the products.

[0023] Preferably, the acid value of the dispersant is within the range of one or any two of 10 mgKOH / mol, 12 mgKOH / mol, 14 mgKOH / mol, 16 mgKOH / mol, 18 mgKOH / mol, 20 mgKOH / mol, 22 mgKOH / mol, 25 mgKOH / mol, 28 mgKOH / mol, 30 mgKOH / mol, 32 mgKOH / mol, 35 mgKOH / mol, 38 mgKOH / mol, and 40 mgKOH / mol.

[0024] Preferably, the acid value of the dispersant is 20 to 30 mgKOH / mol.

[0025] When the acid value of the dispersant is maintained within the above range, it can not only effectively achieve high compatibility and high dispersibility of itself and its components in polycarbonate, but also effectively achieve synergistic effects with the voltage stabilizer to jointly improve the CTI electrical performance of the product.

[0026] More preferably, the acid value of the dispersant is obtained by testing using ASTM D1386-15-2022.

[0027] More preferably, the number average molecular weight of the dispersant is 1,000 to 25,000, and even more preferably 2,500 to 5,000.

[0028] More preferably, the number average molecular weight of the dispersant is in the range of one or any two of 2500, 2800, 3000, 3200, 3500, 3800, 4000, 4200, 4500, 4800, and 5000.

[0029] More preferably, the number average molecular weight of the dispersant is 3500-4500.

[0030] The number average molecular weight of the dispersant is determined by viscosity method according to SH / T0398-2007.

[0031] More preferably, the dispersant has a melt flow rate of 6 to 150 g / 10 min at 300° C. and a load of 1.2 kg according to ISO 1133-2012.

[0032] More preferably, the dispersant has a melt flow rate of 8 to 70 g / 10 min at 300° C. and a load of 1.2 kg according to ISO 1133-2012.

[0033] More preferably, the dispersant has a melt flow rate at 300° C. and a load of 1.2 kg according to ISO 1133-2012 of 10 g / 10 min, 15 g / 10 min, 20 g / 10 min, 30 g / 10 min, 40 g / 10 min, 50 g / 10 min, 60 g / 10 min, 65 g / 10 min, or 70 g / 10 min, or any two of these ranges.

[0034] More preferably, the dispersant has a melt flow rate of 10 to 15 g / 10 min at 300° C. and a load of 1.2 kg according to ISO 1133-2012.

[0035] Preferably, in the polycarbonate composition, the weight ratio of the voltage stabilizer to the dispersant is within the range of one or any two of 0.01:1, 1.6:1, 1.7:1, 3.75:1, 7.25:1, 10:1, 15.5:1, 16:1, 17:1, 32:1, 56:1, 60:1, and 100:1.

[0036] Preferably, in the polycarbonate composition, the weight ratio of the voltage stabilizer to the dispersant is (7-16): 1. Under the above ratio, the two can effectively inhibit the local charge accumulation of the polycarbonate while also achieving optimal toughness and low-temperature toughness.

[0037] Preferably, the polycarbonate is bisphenol A polycarbonate.

[0038] Preferably, the polycarbonate ISO1133-2012 has a melt flow rate of 3 to 26 g / 10 min at 300° C. and a load of 1.2 kg.

[0039] Preferably, the number average molecular weight of the polycarbonate is 22,000 to 30,000.

[0040] Preferably, the number average molecular weight of the polycarbonate is within the range of one or any two of 22,000, 24,000, 25,000, 28,000 and 30,000.

[0041] The number average molecular weight of the polycarbonate of the present invention can be directly measured by gel permeation chromatography.

[0042] More preferably, the polycarbonate has a terminal hydroxyl content of less than 100 ppm and a BPA content of less than 20 ppm.

[0043] Preferably, the toughening agent is at least one of SAN grafted PB rubber, MMA grafted silicone rubber, SAN grafted silicone rubber, SEBS, and MBS.

[0044] More preferably, the toughening agent has a melt index of 0.1 to 5 g / 10 min at 300° C. and a load of 1.2 kg according to ISO 1133-2012.

[0045] Preferably, the flame retardant is a halogen-free flame retardant.

[0046] More preferably, the halogen-free flame retardant is at least one of a phosphorus-based flame retardant, a sulfonate flame retardant, an organosilicon flame retardant, and an inorganic filler flame retardant.

[0047] More preferably, the halogen-free flame retardant is a phosphorus-based flame retardant, and the phosphorus content of the phosphorus-based flame retardant is ≥10 wt %.

[0048] More preferably, the phosphorus-based flame retardant is at least one of DOPO (also known as DOP, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide), TPP (triphenyl phosphate), BDP (bisphenol A bis(diphenyl phosphate)), RDP (resorcinol(diphenyl phosphate)), phosphazene, and phosphate.

[0049] Preferably, the anti-dripping agent is at least one of polytetrafluoroethylene and styrene-acrylonitrile copolymer.

[0050] More preferably, the components of the polycarbonate further include at least one of 0.01 to 1 part of an antioxidant, 0.01 to 1 part of a lubricant, 0.01 to 1 part of a reinforcing filler, and 0.01 to 1 part of a colorant.

[0051] Based on the actual needs of the product, those skilled in the art can appropriately introduce some components commonly introduced into polycarbonate products without affecting the performance of the product, such as antioxidants to improve the aging resistance of the product, lubricants to improve the processing performance of the product, reinforcing fillers to improve the rigidity of the product, and colorants to give the product various colors, etc.

[0052] Another object of the present invention is to provide a method for preparing the insulating flame-retardant polycarbonate composition, comprising the following steps:

[0053] After the components are uniformly mixed, they are melt-extruded and granulated in a twin-screw extruder to obtain the insulating flame-retardant polycarbonate composition.

[0054] The preparation method of the polycarbonate composition of the present invention has simple operating steps and can realize industrial-scale production.

[0055] Preferably, the temperature range of the twin-screw extruder is set to: 220-280°C, the screw speed is 200-600r / min, and the screw length-diameter ratio is 48:1.

[0056] Another object of the present invention is to provide an application of the insulating flame-retardant polycarbonate composition in the preparation of photovoltaic connectors or new energy charging power supplies.

[0057] The polycarbonate composition of the present invention has excellent CTI electrical properties and flame retardant properties, and can achieve CTI300V≥50 drops, 1.5mm flame retardant grade reaches V-0 level, and the impact strength at room temperature reaches 500J / m 2 Above, the impact strength at -30℃ reaches 250J / m 2 The above-mentioned comprehensive performance is excellent, and it is very suitable for the preparation of connectors or charging power supplies for charging piles and other live power sources that need to avoid high-voltage tracking failure and require certain room temperature and low temperature toughness.

[0058] The beneficial effect of the present invention is that the present invention provides an insulating flame-retardant polycarbonate composition. The product, through the combination of specific types of voltage stabilizers and dispersants, can not only effectively improve the CTI electrical performance of the product, making CTI300V≥50 drops, but also has excellent flame retardant properties, and at the same time has sufficient room temperature and low temperature toughness, and can be fully applied in the new energy field. DETAILED DESCRIPTION

[0059] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments and comparative examples. Its purpose is to understand the content of the present invention in detail, rather than to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative work premise all fall within the protection scope of the present invention. The experimental reagents and instruments involved in the implementation of the present invention are all conventional common reagents and instruments unless otherwise specified.

[0060] Examples 1 to 17

[0061] An embodiment of an insulating flame-retardant polycarbonate composition and its application according to the present invention is provided. The components of the polycarbonate composition are shown in Table 1.

[0062] The preparation method of the polycarbonate composition comprises the following steps:

[0063] All the components in the formula are mixed uniformly in a high-speed mixer, and then fed into a twin-screw extruder from a main feeding port for melt blending, extrusion and granulation to obtain the polycarbonate composition.

[0064] When the components are melt-blended and extruded, the temperature zones of the twin-screw extruder are set to 200-220°C in zone 1, 210-230°C in zone 2, 215-235°C in zone 3, 215-235°C in zone 4, 215-235°C in zone 5, 220-245°C in zone 6, 220-245°C in zone 7, 220-245°C in zone 8, 220-240°C in zone 9, 220-240°C in zone 10, 210-230 in zone 11, and 200-220°C in zone 12. The screw speed is 400 rpm and the screw aspect ratio is 48:1.

[0065] Comparative Examples 1 to 9

[0066] The difference between the comparative examples and the examples is only in the types and proportions of the components, as shown in Table 2.

[0067] Among the components described in each embodiment and comparative example,

[0068] The polycarbonate 1 is 1300-03NP, produced by LG Chem, with a melt flow rate of 3.5 g / 10 min at 300° C. and a load of 1.2 kg, a number average molecular weight of 30,000, a terminal hydroxyl group content of less than 100 ppm, and a BPA content of less than 20 ppm;

[0069] The polycarbonate 2 is 1300-10NP, produced by LG Chem, with a melt flow rate of 11.5 g / 10 min at 300° C. and a load of 1.2 kg, a number average molecular weight of 26,500, a terminal hydroxyl content of less than 100 ppm, and a BPA content of less than 20 ppm;

[0070] The polycarbonate 3 is 1300-22NP, produced by LG Chem, with a melt flow rate of 23.2 g / 10 min at 300° C. and a load of 1.2 kg, a number average molecular weight of 22,000, a terminal hydroxyl group content of less than 100 ppm, and a BPA content of less than 20 ppm;

[0071] The toughening agent 1 is M521, MBS, produced by Kaneka, Japan, and has a melt index of 1.3 g / 10 min at 300° C. and 1.2 kg load according to ISO1133;

[0072] The toughening agent 2 is S2501, MMA grafted silicone rubber, produced by Mitsubishi Chemical of Japan, with a melt index of 4.4 g / 10 min at 300°C and 1.2 kg load according to ISO1133;

[0073] The flame retardant is a halogen-free phosphorus flame retardant phosphate ester with a phosphorus content of 9.1 wt%, and is a PX200 product produced by Daihachi, Japan.

[0074] The anti-dripping agent is commercially available polytetrafluoroethylene;

[0075] The voltage stabilizer 1 is commercially available anthraquinone;

[0076] The voltage stabilizer 2 is dianthraquinone, a commercially available anthraquinone derivative;

[0077] The voltage stabilizer 3 is commercially available hydroxyanthraquinone: 2-hydroxyanthraquinone

[0078] The voltage stabilizer 4 is a commercially available aminoanthraquinone: 2,6-diaminoanthraquinone

[0079] The voltage stabilizer 3 is commercially available phosphoric acid;

[0080] The voltage stabilizer 4 is hindered phenol 1076 produced by BASF (it should be noted here that although this product is a common antioxidant, it also has the function of voltage stabilization in PC alloys);

[0081] The dispersant 1 is AC325, produced by Honeywell, an oxidized polyethylene wax with an acid value of 25 mgKOH / mol, a number average molecular weight of 4500, and a melt flow rate of 15 g / 10 min at 300°C and a load of 1.2 kg;

[0082] The dispersant 2 is AC330, produced by Honeywell, an oxidized polyethylene wax with an acid value of 30 mgKOH / mol, a number average molecular weight of 3600, and a melt flow rate of 12.5 g / 10 min at 300°C and a load of 1.2 kg;

[0083] The dispersant 3 is 4202E, produced by Mitsui, Japan, oxidized polyethylene wax, with an acid value of 17 mgKOH / mol, a number average molecular weight of 2600, and a melt flow rate of 67 g / 10 min at 300°C and a load of 1.2 kg;

[0084] The dispersant 4 is 2203, produced by Mitsui, Japan, oxidized polyethylene wax, with an acid value of 35 mgKOH / mol, a number average molecular weight of 2700, and a melt flow rate of 65 g / 10 min at 300°C and a load of 1.2 kg;

[0085] The dispersant 5 is AC307, produced by Honeywell, an oxidized polyethylene wax, with an acid value of 7 mgKOH / mol, a number average molecular weight of 85,000, and a melt flow rate of 1.2 g / 10 min at 300° C. and a load of 1.2 kg;

[0086] The dispersant 6 is AC5120, produced by Honeywell, an oxidized polyethylene wax, with an acid value of 120 mgKOH / mol, a number average molecular weight of 575, and a melt flow rate of 287 g / 10 min at 300°C and a load of 1.2 kg;

[0087] The dispersant 7 is NF308, produced by Mitsui, Japan, maleic anhydride grafted polypropylene, with an acid value of 30 mgKOH / mol and a melt flow rate of 100 g / 10 min at 190°C and a load of 2.16 kg;

[0088] The dispersant 8 is PETS and GLYCOBEP produced by Lonza.

[0089] Unless otherwise specified, the components and raw materials used in the examples and comparative examples of the present invention are all commercially available raw materials, and the components and raw materials used in each parallel experiment are all of the same kind.

[0090] Table 1

[0091] Table 2

[0092] In order to verify the performance of the polycarbonate composition of the present invention, the products prepared in each embodiment and comparative example were subjected to the following performance tests. The specific steps are as follows:

[0093] (1) Room temperature IZOD notched impact strength test: According to ASTM D256, each product was injection molded into an impact specimen with a size of 3.2 mm and tested using a V-notch with an impact strength of 1.25 J.

[0094] (2) -30℃ notched impact strength test: The specimens were placed in a -30℃ freezer oven for 4 hours and then taken out. According to the ASTM D275 standard, each product was injection molded into an impact specimen with a size of 3.2mm. The V-notch was used for testing, and the impact strength was 1.25J.

[0095] (3) 1.5mm flame retardant grade test: tested and determined according to UL94-2023 standard;

[0096] (4) CTI300V test: Test and judge according to ASTM D3638 standard.

[0097] The test results are shown in Tables 3 and 4.

[0098] Table 3

[0099] Table 4

[0100] From Table 3 and Table 4, it can be seen that the impact strength of the polycarbonate composition of the present invention is relatively high at room temperature, which can reach 600 J / m 2 And above, the impact strength at -30℃ can reach 250J / m 2and above, and the toughness performance at room temperature and low temperature is excellent; at the same time, the products all reach the flame retardant V-0 grade at 1.5mm, and the CTI failure drop number of 300V is ≥50 drops, and the highest can reach more than 100 drops. In comparison, the voltage stabilizer and dispersant were not introduced into the products of Comparative Example 1 and Comparative Example 5, respectively, and the CTI performance and toughness performance of the products were less than ideal. According to the comparison of the products of Example 1, Examples 10-11, Examples 12-13 and Comparative Examples 2 and 6, it can be seen that the addition amount of these two components cannot be too much, otherwise it will cause the weakening of various aspects of the product performance. From the comparison of the performance of the products of Example 1 and Examples 14-17, it can be seen that when the total amount of the two components added is certain, when the ratio of the two components meets the (7-16):1, the comprehensive performance of the product is better. From the product performance results of Examples 1, 6, 18-19, and Comparative Examples 3-4, it can be seen that the use of conventional voltage stabilizers cannot truly take into account the compatibility with the matrix resin, nor can it be well matched with the dispersant, and the CTI performance and toughness performance of the products are not ideal; and according to the comparison of the products of Example 1 with Comparative Examples 9 and 10, it can be seen that if an existing commercially available more conventional processing dispersant or another polyolefin is used as a dispersant, it may not be possible to achieve the same performance improvement as the dispersant type described in the present invention. According to the product performance of Examples 1, 8-9, and Comparative Examples 7-8, even if an oxidized polyethylene wax with carboxyl and / or hydroxyl groups is selected as a dispersant, the acid value of the product needs to be strictly controlled within the range of 10-40 mKOH / mol (preferably 20-30 mKOH / mol). Otherwise, not only will the compatibility of the components of the product fail to be improved, but the CTI performance of the product may even be negatively affected.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An insulating flame-retardant polycarbonate composition, characterized in that: The composition comprises the following components in parts by weight: 55-95 parts of polycarbonate, 1-20 parts of toughening agent, 1-20 parts of flame retardant, 0.01-10 parts of voltage stabilizer, 0.01-1 parts of dispersant and 0.1-5 parts of anti-dripping agent; The voltage stabilizer is at least one of anthraquinone and anthraquinone derivatives; The dispersant is oxidized polyethylene wax, and the acid value is 10-40 mgKOH / mol.

2. The polycarbonate composition according to claim 1, wherein The anthraquinone derivative includes at least one of hydroxyanthraquinone, aminoanthraquinone and dianthraquinone.

3. The polycarbonate composition according to claim 1, wherein The acid value of the dispersant is 20 to 30 mgKOH / mol.

4. The polycarbonate composition according to claim 1, wherein The number average molecular weight of the dispersant is 1000 to 25000, and the melt flow rate at 300° C. and 1.2 kg load according to ISO1133-2012 is 50 to 150 g / 10 min.

5. The polycarbonate composition according to claim 1, wherein In the polycarbonate composition, the weight ratio of the voltage stabilizer to the dispersant is (7-16):

1.

6. The polycarbonate composition according to claim 1, wherein The polycarbonate has a melt flow rate of 3 to 26 g / 10 min at 300° C. and a load of 1.2 kg according to ISO 1133-2012, and a number average molecular weight of 22,000 to 30,000.

7. The polycarbonate composition according to claim 1, wherein The toughening agent is at least one of SAN grafted PB rubber, MMA grafted silicone rubber, SAN grafted silicone rubber, SEBS, and MBS.

8. The polycarbonate composition according to claim 1, wherein The flame retardant is a halogen-free flame retardant; the anti-dripping agent is at least one of polytetrafluoroethylene and styrene-acrylonitrile copolymer.

9. The method for preparing the insulating flame-retardant polycarbonate composition according to any one of claims 1 to 8, characterized in that: The following steps are involved: After the components are uniformly mixed, they are melt-extruded and granulated in a twin-screw extruder to obtain the insulating flame-retardant polycarbonate composition.

10. Use of the insulating flame-retardant polycarbonate composition according to any one of claims 1 to 8 in the preparation of photovoltaic connectors or new energy charging power supplies.

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