A polycarbonate composition, its preparation method and application

Abstract

A polycarbonate composition, a preparation method and an application thereof. The polycarbonate composition is characterized by comprising the following components in parts by weight: 100 parts of polycarbonate, 1 to 30 parts of a flame retardant, 10 to 30 parts of a filler with hydroxyl groups on the surface, 0.2 to 1.5 parts of a dripping inhibitor, 0.1 to 8 parts of a maleic anhydride grafted non-polar resin, and 0 to 5 parts of other additives; the static water contact angle θ of the maleic anhydride grafted non-polar resin measured according to GB / T 30447-2013 is ≥80°. The polycarbonate composition has ultra-low and stable shrinkage, and at the same time has high modulus, high toughness and thin-wall flame retardancy, and can be widely applied to fields such as electricity, household appliances or transportation.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and more specifically, to a polycarbonate composition, a preparation method thereof, and an application thereof. Background Art

[0002] As is well known, due to the characteristics of its molecular structure, polycarbonate (PC) has outstanding impact toughness, excellent thermal stability, excellent dimensional stability, and electrical insulation, and is widely used in fields such as electronics and electrical appliances, transportation, medical devices, construction, and lighting, and is an important part of engineering plastics. With the trend of replacing steel with plastic, the application fields of plastics are becoming more and more extensive, so people's requirements for the dimensional accuracy of plastic parts are becoming increasingly stringent. Precision injection molding has become an important process for plastic molding, and its characteristics are high precision of injection molded parts, including high dimensional accuracy and high repeat accuracy. In order to reduce the fluctuation of the molding shrinkage rate of parts, the shrinkage rate of the polycarbonate composition can be designed to provide a guarantee for precision injection molding.

[0003] The country has created conditions for the self-circulation of the plastic industry chain, and the growth of the recycled plastic market is an inevitable trend. In order to adapt to the development of the policy environment and market environment, it is particularly important to develop innovative technologies applicable to recycled polycarbonate (PCR).

[0004] The Chinese patent named Polycarbonate / Polyethylene Terephthalate Alloy Material and Its Preparation Method provides a polycarbonate alloy material. Specifically, by adding a certain amount of polyethylene terephthalate and inorganic fillers to PC resin, the obtained polycarbonate alloy material has a low shrinkage rate (0.45%), but this shrinkage rate still cannot meet some precision injection molding application scenarios with lower and more stable shrinkage rate requirements, such as lens modules, module materials with image display, etc., which require the shrinkage rate to be stable between 0.28% and 0.33%. In addition, there is a hidden danger of transesterification reaction in the polycarbonate alloy material of this patent, and there is a risk of decline in strength and toughness under harsh injection molding environments, which also makes this technology difficult to be applicable to PCR resin.

[0005] Therefore, it is particularly important to study a technology that can make polycarbonate materials have a low and stable shrinkage rate, high toughness, and be applicable to PCR resin. Summary of the Invention

[0006] The primary object of the present invention is to overcome the deficiencies or defects of the above-mentioned prior art that cannot make polycarbonate materials have a low and stable shrinkage rate, high toughness, and be inapplicable to PCR resin, and to provide a polycarbonate composition. This polycarbonate composition has an ultra-low and stable shrinkage rate, and at the same time has high modulus, high toughness, and thin-wall flame retardancy, and can be widely used in fields such as electricity, household appliances, or transportation.

[0007] A further object of the present invention is to provide a method for preparing the above polycarbonate composition.

[0008] A further object of the present invention is to provide the application of the above polycarbonate composition in the preparation of electrical products, household appliance products or transportation products.

[0009] The above objects of the present invention are achieved by the following technical solutions:

[0010] A polycarbonate composition, comprising the following components in parts by weight:

[0011]

[0012] The static water contact angle θ of the maleic anhydride grafted non-polar resin measured according to GB / T 30447-2013 is θ≥80°.

[0013] The static water contact angle of non-polar resins (such as polypropylene resin, polyethylene resin) is generally θ≥120°. After grafting maleic anhydride, the static water contact angle decreases, and can drop to about 28° at most. The factors affecting the static water contact angle of the maleic anhydride grafted non-polar resin include the grafting amount, grafting density and the distribution of maleic anhydride groups, etc., and these factors are in turn affected by the raw material ratio, extrusion temperature and grafting reaction time. For example, other conditions can be controlled unchanged during the preparation process, and the grafting reaction time can be adjusted to obtain a maleic anhydride non-polar resin with a specific static water contact angle.

[0014] The inventors of the present invention have found through multiple studies that using polycarbonate (including virgin polycarbonate and recycled polycarbonate) as the main resin, the addition of fillers and maleic anhydride grafted non-polar resins can make the obtained polycarbonate composition have an ultra-low and stable shrinkage rate (0.28% - 0.33%), and at the same time have a high modulus (bending strength greater than 3800 MPa) and high toughness, meeting the requirements of precision injection molding. This is not only applicable to conventional virgin polycarbonate, but also to recycled polycarbonate, conforming to the concept of environmental protection. In addition, on this basis, adding a flame retardant can improve the flame retardant performance of the polycarbonate composition, and it has good thin-wall flame retardancy (1.0 mm V-0). The polycarbonate composition of the present invention can be widely applied in the fields of electricity, household appliances or transportation, etc.

[0015] Specifically, adding a certain amount of filler to polycarbonate can fix and restrain the polycarbonate molecular chains, reduce the shrinkage rate of the polycarbonate composition and increase the modulus of the polycarbonate composition. On this basis, adding a maleic anhydride-grafted non-polar resin with a specific static water contact angle (θ≥80°) further reduces the shrinkage rate of the polycarbonate composition and improves its stability. The reasons are as follows: First, the static water contact angle of the maleic anhydride-grafted non-polar resin is similar to that of polycarbonate, which is conducive to the uniform mixing of the maleic anhydride-grafted non-polar resin and polycarbonate. Second, due to the non-polar molecular structure, micro-interfacial voids are formed between the maleic anhydride-grafted non-polar resin and the polar polycarbonate. These interfacial voids are beneficial to the dispersion of the filler. At the same time, since the maleic anhydride group can react with the hydroxyl groups on the surface of the filler, the dispersion effect of the filler is further enhanced, which can keep the shrinkage rate of the polycarbonate composition at a low level. Third, the maleic anhydride group can also react with the terminal hydroxyl and carboxyl groups of polycarbonate, especially with the hydroxyl groups of recycled polycarbonate, playing a capping role and introducing non-polar chain segments at the terminal positions of polycarbonate molecules, reducing the negative impact of moisture during processing and further improving the stability of the polycarbonate composition. In addition, the micro-interfacial voids formed between the maleic anhydride-grafted non-polar resin and polycarbonate can effectively terminate cracks, improve the toughness of the polycarbonate composition, and thus avoid potential problems such as reduced processing fluidity, increased melt viscosity of the system, insufficient improvement in toughness caused by the multi-phase system, and appearance defects brought about by the addition of traditional toughening agents.

[0016] Preferably, the polycarbonate composition comprises the following components in parts by weight:

[0017]

[0018] Preferably, the static water contact angle of the maleic anhydride-grafted non-polar resin is 83°≤θ≤100°.

[0019] Preferably, the maleic anhydride-grafted non-polar resin is at least one of maleic anhydride-grafted polypropylene resin, maleic anhydride-grafted polyethylene resin, maleic anhydride-grafted polystyrene resin, or maleic anhydride-grafted polyethylene resin polytetrafluoroethylene.

[0020] The maleic anhydride-grafted non-polar resin can be either commercially available or self-made.

[0021] Preferably, the polycarbonate is virgin polycarbonate and / or recycled polycarbonate.

[0022] The polycarbonate of the present invention can use recycled polycarbonate, which conforms to the concept of green environmental protection, has a low production cost, and creates good commercial value.

[0023] More preferably, the weight part of recycled polycarbonate in the polycarbonate is not less than 10%.

[0024] Further preferably, the weight part of recycled polycarbonate in the polycarbonate is 30% - 70%.

[0025] In this weight part range, the production cost, environmental protection and performance (shrinkage rate, modulus, toughness and thin-wall flame retardancy) of the polycarbonate composition can be better balanced.

[0026] It should be noted that the recycled polycarbonate refers to the recycled material obtained by classifying and collecting waste polycarbonate according to the conventional physical recycling treatment methods in the art.

[0027] The virgin polycarbonate refers to the polycarbonate resin that is directly used without injection molding or use after polymerization.

[0028] More preferably, the weight-average molecular weight of the recycled polycarbonate is 38,000 - 53,000, the terminal hydroxyl group content is 98 - 820 ppm, and the BPA content is 33 - 78 ppm.

[0029] It should be noted that the terminal hydroxyl group content of the recycled polycarbonate is measured according to the HG / T 2709-1995 standard; the BPA content is measured according to the GB / T 32889-2016 standard.

[0030] The commonly used virgin polycarbonate, fillers with hydroxyl groups on the surface, flame retardants and anti-dripping agents in the art can all be used in the present invention.

[0031] Preferably, the weight-average molecular weight of the virgin polycarbonate is 30,000 - 48,000.

[0032] Preferably, the terminal hydroxyl group content of the virgin polycarbonate is 87 - 223 ppm.

[0033] Preferably, the BPA content of the virgin polycarbonate is 25 - 54 ppm.

[0034] It should be noted that the terminal hydroxyl group content of the virgin polycarbonate is measured according to the HG / T 2709-1995 standard; the BPA content is measured according to the GB / T 32889-2016 standard.

[0035] Preferably, the filler with hydroxyl groups on the surface is at least one of talc, wollastonite, kaolin or glass powder.

[0036] Preferably, the flame retardant is at least one of resorcinol-bis(2,6-dimethylphenyl) phosphate or hydroquinone-bis(2,6-dimethylphenyl) phosphate.

[0037] Preferably, the anti-dripping agent is a fluoropolymer, such as but not limited to SAN-coated PTFE, MMA-coated PTFE, silicone-coated PTFE, PTFE pure powder or PTFE emulsion, etc.

[0038] More preferably, the anti-dripping agent is SAN-coated PTFE.

[0039] Preferably, the other additives are at least one of color powder or antioxidant.

[0040] The preparation method of the above polycarbonate composition comprises the following steps: mixing the components, melt-extruding, and granulating to obtain the polycarbonate composition.

[0041] Preferably, the preparation method comprises the following steps: stirring and mixing the components in a high-speed mixer, then melt-extruding in a twin-screw extruder, and granulating to obtain the polycarbonate composition.

[0042] More preferably, the rotation speed of the stirring and mixing is 10 - 50 r / min; the length-diameter ratio of the twin-screw extruder is 30 - 50:1, the barrel temperature is 230 - 265 °C, and the screw rotation speed is 200 - 600 r / min.

[0043] The application of the above polycarbonate composition in the preparation of electrical products, household electrical appliances or transportation products.

[0044] Preferably, the electrical product is the housing of a high-power electric tool.

[0045] It should be understood that the high power means a power of more than 3000 watts.

[0046] Preferably, the household electrical appliance is the housing of a television, a stereo, a kitchen appliance or a heater.

[0047] Preferably, the transportation product is an internal component of a fuel vehicle, an internal component of a new energy vehicle, an internal component of a bus or an internal component of a high-speed train.

[0048] Compared with the prior art, the beneficial effects of the present invention are:

[0049] The polycarbonate composition has an ultra-low and stable shrinkage rate, can achieve dimensional stability in different processing windows, reduce the hidden dangers of demolding scratches or non-conforming dimensions, and at the same time has high modulus, high toughness and thin-wall flame retardancy, and can be widely applied to fields such as electricity, household appliances or transportation. Specific Embodiments

[0050] To describe the technical solution of the present invention more clearly and completely, the following further details the present invention through specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, and various changes can be made within the scope defined by the claims of the present invention.

[0051] The descriptions of some of the reagents selected in the embodiments and comparative examples of the present invention are as follows:

[0052] Polycarbonate (new material) No. 1: A2200, manufactured by Idemitsu Kosan Co., Ltd., Japan, with a weight-average molecular weight of 48,000, a terminal hydroxyl group content of 87 ppm, and a BPA content of 25 ppm.

[0053] Polycarbonate (new material) No. 2: FN1500, manufactured by Idemitsu Kosan Co., Ltd., Japan, with a weight-average molecular weight of 30,000, a terminal hydroxyl group content of 223 ppm, and a BPA content of 54 ppm.

[0054] Polycarbonate (recycled) No. 1: PC TJ-20A, manufactured by Tianju, with a weight-average molecular weight of 48,000; a terminal hydroxyl group content of 820 ppm, and a BPA content of 57 ppm.

[0055] Polycarbonate (recycled) No. 2: CQ-60A, manufactured by Chengqiao, with a weight-average molecular weight of 28,000, a terminal hydroxyl group content of 1297 ppm, and a BPA content of 82 ppm.

[0056] Polycarbonate (recycled) No. 3: PC ASL-06, manufactured by Aosai'er, with a weight-average molecular weight of 53,000, a terminal hydroxyl group content of 106 ppm, and a BPA content of 33 ppm.

[0057] Polycarbonate (recycled) No. 4: PC TJ-10A, manufactured by Tianju, with a weight-average molecular weight of 38,000, a terminal hydroxyl group content of 98 ppm, and a BPA content of 78 ppm.

[0058] Maleic anhydride grafted non-polar resin: self-made, and the preparation method is as follows: Using non-polar resins (such as PP resin, PE resin) as the matrix, mixing them evenly with maleic anhydride and loading them into a three-necked flask, purging the oxygen in the reaction flask, heating and stirring to 100 °C and then adding the initiator, carrying out different grafting reaction times to obtain different products, taking out the products and performing three times of suction filtration with distilled water, and drying at 80 °C to obtain the product. The grafting reaction time and static water contact angle of each maleic anhydride grafted non-polar resin are as follows: 2 After removing the oxygen in the reaction flask, heating and stirring to 100 °C and then adding the initiator, carrying out different grafting reaction times to obtain different products, taking out the products and performing three times of suction filtration with distilled water, and drying at 80 °C to obtain the product. The grafting reaction time and static water contact angle of each maleic anhydride grafted non-polar resin are as follows:

[0059] Maleic anhydride grafted non-polar resin No. 1: The matrix is B1101 (Taihua), PP resin, the grafting reaction time is 4.5 h, and the static water contact angle is 85°;

[0060] Maleic anhydride grafted non-polar resin 2#: The matrix is B1101 (Formosa Plastics), PP resin, the grafting reaction time is 5.8 h, and the static water contact angle is 83°;

[0061] Maleic anhydride grafted non-polar resin 3#: The matrix is B1101 (Formosa Plastics), PP resin, the grafting reaction time is 0.5 h, and the static water contact angle is 100°;

[0062] Maleic anhydride grafted non-polar resin 4#: The matrix is B1101 (Formosa Plastics), PP resin, the grafting reaction time is 6.3 h, and the static water contact angle is 80°;

[0063] Maleic anhydride grafted non-polar resin 5#: The matrix is 5000S (Lotte Chemical Korea), PE resin, the grafting reaction time is 1 h, and the static water contact angle is 90°;

[0064] Maleic anhydride grafted non-polar resin 6#: The matrix is B1101 (Formosa Plastics), PP resin, the grafting reaction time is 8 h, and the static water contact angle is 72°;

[0065] Maleic anhydride grafted polar resin: The difference from the preparation method of maleic anhydride grafted non-polar resin is that a polar resin is selected as the matrix. The matrix is Jia Yirong SAG-002, SAN resin, the grafting reaction time is 2 h, and the static water contact angle is 85°;

[0066] Non-polar resin 1#: B1101 (Formosa Plastics), PP resin, the static water contact angle is 115°;

[0067] Acrylic acid grafted non-polar resin: The difference from the preparation method of maleic anhydride grafted non-polar resin is that maleic anhydride is replaced by acrylic acid. The matrix is B1101 (Formosa Plastics), the grafting reaction time is 5 h, and the static water contact angle is 89°;

[0068] Traditional toughening agent: M-701, Kaneka, MBS;

[0069] Filler 1# with hydroxyl groups on the surface: 3CA, Imerys, talc;

[0070] Filler 2# with hydroxyl groups on the surface: 10992, Imerys, wollastonite;

[0071] Filler without hydroxyl groups on the surface: silica, commercially available;

[0072] Flame retardant: bisphenol A bis(diphenyl phosphate), commercially available;

[0073] Drip retardant: PTFE coated with SAN, commercially available;

[0074] Other additives: antioxidant 1010, commercially available.

[0075] Unless otherwise specified, the components (eg, flame retardant, anti-dripping agent, other additives) selected in each parallel example and comparative example are the same commercially available products.

[0076] The performance of the polycarbonate compositions provided in the embodiments and comparative examples of the present invention was measured according to the following test methods:

[0077] Flame retardant grade: The flammability test is carried out in accordance with the procedure of "Flammability Test of Plastic Materials, UL94-2022". The flame retardant grade is derived based on the burning rate, extinguishing time, ability to resist decline, and whether the decline is burning. Samples used for testing: 125mm length and 13mm width. The thickness of the present invention is selected as 1.0mm during the test. According to the UL94 regulations, the flame retardant grade of the material can be classified into (UL94-HB): V0, V1, V2, 5VA and / or 5VB. At the same time, the sample is measured in a constant temperature and humidity chamber. After the temperature is set at 85°C and the humidity is 85% for 500h, its flame retardant grade is measured under the same conditions.

[0078] Flexural Strength: Tested in accordance with ASTM D790-2017.

[0079] Bending toughness: After injection molding of 1.0mm*12mm*100mm specimens, place them in an environment with room temperature of 25℃ and humidity of 50% for more than 48 hours, bend both ends downward 180 degrees and record whether they are broken. If they are not broken, the toughness is recorded as OK. If there is breakage or peeling, the toughness is considered poor. Among them, the breakage phenomenon is recorded as NG-1 and the peeling phenomenon is recorded as NG-2.

[0080] Shrinkage rate: The injection temperature is fixed at 265°C, the injection pressure is 50%, the injection speed is 50%, and a 2.0 mm cross shrinkage rate plate is injected. After injection, it is placed at room temperature of 25°C and humidity of 50% for conditioning for more than 48 hours, and then measured and recorded by the secondary element to obtain the shrinkage rate.

[0081] The preparation process of the polycarbonate composition of each embodiment and comparative example of the present invention is as follows: each component is weighed according to the ratio, added into a high-speed mixer, stirred and blended to obtain a premix, and then extruded in a twin-screw extruder, and the polycarbonate composition is obtained after a melt granulation process. The stirring speed is 35 rpm, the aspect ratio of the twin-screw extruder is 40:1, the barrel temperature is 250°C, and the screw speed is 400 rpm.

[0082] Examples 1 to 20

[0083] Examples 1 to 20 provide a series of polycarbonate compositions, whose formulations are shown in Table 1, Table 2 and Table 3.

[0084] Table 1 Formulations of Examples 1 - 5 (parts by weight)

[0085]

[0086]

[0087] Table 2 Formulations of Examples 6 - 15 (parts by weight)

[0088]

[0089] Table 3 Formulations of Examples 16 - 20 (parts by weight)

[0090]

[0091]

[0092] Comparative Example 1

[0093] This comparative example provides a polycarbonate composition, the formulation of which is different from that of Example 1 in that maleic anhydride grafted non - polar resin 1# is replaced by maleic anhydride grafted non - polar resin 6#.

[0094] Comparative Example 2

[0095] This comparative example provides a polycarbonate composition, the formulation of which is different from that of Example 1 in that maleic anhydride grafted non - polar resin 1# is replaced by maleic anhydride grafted polar resin.

[0096] Comparative Example 3

[0097] This comparative example provides a polycarbonate composition, the formulation of which is different from that of Example 1 in that maleic anhydride grafted non - polar resin 1# is replaced by non - polar resin 1#.

[0098] Comparative Example 4

[0099] This comparative example provides a polycarbonate composition, the formulation of which is different from that of Example 1 in that maleic anhydride grafted non - polar resin 1# is replaced by a traditional toughening agent.

[0100] Comparative Example 5

[0101] This comparative example provides a polycarbonate composition, the formulation of which is different from that of Example 1 in that maleic anhydride grafted non - polar resin 1# is replaced by acrylic acid grafted non - polar resin.

[0102] Comparative Example 6

[0103] This comparative example provides a polycarbonate composition, the difference in its formulation from that of Example 1 being that maleic anhydride grafted non-polar resin 1# is not added.

[0104] Comparative Example 7

[0105] This comparative example provides a polycarbonate composition, the difference in its formulation from that of Example 1 being that the filler 1# with hydroxyl groups on its surface is replaced by a filler without hydroxyl groups on its surface.

[0106] The properties of the polycarbonate compositions of each example and comparative example were measured according to the above-mentioned test methods, and the test results are shown in Table 4.

[0107] Table 4 Performance test results of the polycarbonate compositions of each example and comparative example

[0108]

[0109]

[0110] As can be seen from Table 4, the shrinkage rates of the polycarbonate compositions of Examples 1 to 20 are between 0.28% and 0.33%, having low and stable shrinkage rates, meeting the application scenario requirements of precision injection molding, such as in lens modules and application scenarios with image display modules; among them, within the range of shrinkage rates from 0.28% to 0.33%, the closer the shrinkage rate is to the median value (the median value of 0.28% to 0.33% is 30.5%), the higher the stability. Therefore, the polycarbonate compositions of Examples 1, 4, 5, 6, 7, 8, 9, 12, 13, 16, 19, and 20 have better stability; and the flexural strengths of the polycarbonate compositions of Examples 1 to 20 are greater than 3800 MPa, the toughness tests are all OK, and the flame retardant grades are all 1.0 mm V-0, indicating that the polycarbonate compositions of the present invention have ultra-low and stable shrinkage, and at the same time have high modulus, high toughness, and thin-wall flame retardancy, and can be widely used in fields such as electrical, household appliances, or transportation. The shrinkage rates of the polycarbonate compositions of Comparative Example 1 (adding maleic anhydride grafted non-polar resin 6#), Comparative Example 2 (adding maleic anhydride grafted polar resin), Comparative Example 3 (adding non-polar resin 1#), Comparative Example 4 (adding traditional toughening agent), Comparative Example 5 (adding acrylic acid grafted non-polar resin), and Comparative Example 6 are too high to meet the specific application scenario requirements of precision injection molding, and the moduli and toughnesses of the polycarbonate compositions of Comparative Examples 1 to 5 are relatively low. Among them, the flame retardant properties of the polycarbonate compositions of Comparative Examples 1, 3 to 6 are poor, and the flame retardant grade is 1.0 mm V-1.

[0111] The filler added to the polycarbonate composition of Comparative Example 7 has a surface without hydroxyl groups, and its shrinkage rate is too low. Due to the surface characteristics of the filler, its compatibility with polycarbonate is poor, which will cause the non-hydroxyl filler to be not easily wetted. This not only results in poor appearance quality of the material and easy degradation of the resin, but also cannot cooperate with the flame retardant, so its flame retardant performance is poor. Due to the inability to form an effective interfacial bond, its modulus and toughness are low. Therefore, the shrinkage rate of the material is lower than 0.28%. If the shrinkage rate of the material is less than 0.28% during injection molding, it is easy to have problems with demolding, resulting in deformation, fracture or appearance defects of the material being ejected, which has a great negative impact on the defective rate of molding processing.

[0112] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A polycarbonate composition, characterized in that, it comprises the following components in parts by weight: 100 parts of polycarbonate, 1 - 30 parts of flame retardant, 10 - 30 parts of filler with hydroxyl groups on the surface, 0.2 - 1.5 parts of anti - dripping agent, 0.1 - 8 parts of maleic anhydride - grafted non - polar resin, 0 - 5 parts of other additives; the static water contact angle θ of the maleic anhydride - grafted non - polar resin measured according to GB / T 30447 - 2013 is ≥ 80° the maleic anhydride - grafted non - polar resin is at least one of maleic anhydride - grafted polypropylene resin, maleic anhydride - grafted polyethylene resin or maleic anhydride - grafted polystyrene resin; the filler with hydroxyl groups on the surface is at least one of talc, wollastonite, kaolin or glass powder.

2. The polycarbonate composition according to claim 1, characterized in that, it comprises the following components in parts by weight: 100 parts of polycarbonate, 6 - 12 parts of flame retardant, 12 - 25 parts of filler with hydroxyl groups on the surface, 0.3 - 1.2 parts of anti - dripping agent, 0.15 - 3 parts of maleic anhydride - grafted non - polar resin; 0.1 - 2 parts of other additives.

3. The polycarbonate composition according to claim 1, characterized in that, the static water contact angle of the maleic anhydride - grafted non - polar resin is 83° ≤ θ ≤ 100°.

4. The polycarbonate composition according to claim 1, characterized in that, the polycarbonate is virgin polycarbonate.

5. The preparation method of the polycarbonate composition according to any one of claims 1 - 4, characterized in that, it comprises the following steps: mixing each component, melt - extruding, and pelletizing to obtain the polycarbonate composition.

6. The application of the polycarbonate composition according to any one of claims 1 - 4 in the preparation of electrical products, household electrical appliances or transportation products.

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