CN116769292A - Halogen-free flame-retardant polycarbonate composition and preparation method and application thereof - Google Patents

Abstract

The application discloses a halogen-free flame-retardant polycarbonate composition, a preparation method and application thereof, and relates to the field of engineering plastics. The material comprises the following raw materials in parts by weight: polycarbonate: 19-98 parts; ABS: 0.5-25 parts; flame retardant: 1-25 parts; hydrophobing agent: 0.01-5 parts; toughening agent: 0.5-20 parts; anti-drip agent: 0.05-5 parts; the hydrophobic agent is OPS1, the toughening agent is a silicon toughening agent, the silica gel content is more than 8%, the rubber particle size is more than 380nm, and the moisture content of the flame retardant is below 0.2%. According to the application, the hydrophobic agent with a migration three-dimensional molecular structure is added to form an effective barrier between a damp-heat environment and a material, the silicon toughening agent can accelerate migration of the hydrophobic agent to the surface, and meanwhile, the processing fluidity of the material is improved based on the synergistic flame retardant effect of the flame retardant, so that the damp-heat stable material with high flow, thin-wall flame retardance and good appearance is realized.

Description

Halogen-free flame-retardant polycarbonate composition and preparation method and application thereof

Technical Field

The application relates to the field of engineering plastics, in particular to a halogen-free flame-retardant polycarbonate composition, and a preparation method and application thereof.

Background

The polycarbonate ABS alloy is an engineering plastic alloy developed in the middle 60 th century, has the characteristics of excellent mechanical property, heat resistance and electrical property of polycarbonate, excellent processability of ABS and the like, and is widely applied to the fields of household appliances, automobiles, electronic and electric products and the like. As the molecular chain of the material has ester groups, if the material encounters water molecules in a high-temperature environment, the water molecules can be converted into steam to permeate between the molecules of the material, so that the hydrolysis reaction of the material is promoted, the material is brittle, the mechanical property and the flame retardant property are seriously affected, and the application of the polycarbonate ABS in the high-temperature and high-humidity environment is limited.

Therefore, in order to meet the technology updating and changing requirements of the polycarbonate ABS alloy material in application, the polycarbonate ABS alloy material needs to have stable humid heat aging stability and ensure enough mechanical properties in the working and service processes. The prior anti-damp heat, flame retardant and toughening technologies have certain limitations, any component added into the polycarbonate is likely to cause the reduction of damp heat aging stability, can not provide guarantee for the service safety of mechanical properties, and particularly has the ultrahigh-requirement application fields for the performances of consumer electronics, new energy automobiles, outdoor communication and the like at present, and puzzles the development of high-performance materials.

Disclosure of Invention

The application provides a halogen-free flame-retardant polycarbonate composition, a preparation method and application thereof, and aims to solve the technical problems of serious reduction of flame retardance and mechanical properties of materials in a hot and humid environment.

In order to solve the technical problems, one of the purposes of the application is to provide a halogen-free flame-retardant polycarbonate composition which comprises the following components in parts by weight:

polycarbonate: 19-98 parts;

ABS: 0.5-25 parts;

flame retardant: 1-25 parts;

hydrophobing agent: 0.01-5 parts;

toughening agent: 0.5-20 parts;

anti-drip agent: 0.05-5 parts;

wherein the hydrophobizing agent is polyhedral oligomeric silsesquioxane (POSS), and the polymerization degree is less than 9; the toughening agent is a silicon toughening agent, the silica gel content is more than 8%, and the rubber particle size is more than 380nm; the moisture content of the flame retardant is below 0.2%.

By adopting the scheme, the hydrophobic agent with a migration three-dimensional molecular structure is added to form an effective barrier between a wet and hot environment and a material to form a super-hydrophobic surface, the existence of the silicon toughening agent with large particle size and more silica gel content can accelerate the migration of the hydrophobic agent to the surface, meanwhile, the smaller polymerization degree is beneficial to the migration rate of the hydrophobic agent, a sufficient toughness network can be formed in a matrix, the toughness reduction caused by the negative influence of moisture on the material is reduced, and the addition of the silicon toughening agent with large particle size and more silica gel content can improve the processing fluidity of the material; based on the synergistic flame retardant effect of the BDP flame retardant and the hydrophobe, the water content of the BDP flame retardant affects the hydrophobe reaction process of the polycarbonate material, so that the moisture and heat resistance of the hydrophobe are prevented from being reduced due to the excessively high water content, and meanwhile, the reaction rate of the hydrophobe can be promoted due to the small amount of water contained in the BDP flame retardant, the heat and humidity ageing resistance can be improved, and the polycarbonate material is maintained to have good mechanical property and flame retardant property under the high-temperature and high-humidity environment; the silsesquioxane has certain volume and space effect, good processing fluidity, good water and heat stability, and high-efficiency flame-retardant synergistic effect, can form a ternary complementary system with a flame retardant toughening agent, and improves the stability of various performances of the material in wet heat aging so as to obtain a wet heat stable material with high flow, thin-wall flame retardance and good appearance.

Preferably, the flame retardant is BDP flame retardant.

As a preferable scheme, the glue content of the ABS is 8% -30%.

The composition comprises the following components in parts by weight:

polycarbonate: 42-93 parts;

ABS: 2-20 parts;

flame retardant: 4-18 parts;

hydrophobing agent: 0.1-3 parts;

toughening agent: 1-15 parts;

anti-drip agent: 0.2 to 1 part.

As a preferable scheme, the mass ratio of the hydrophobizing agent to the toughening agent is (1-3): (4-50).

Preferably, the polycarbonate has an average molecular weight of 20000 to 25000, a hydroxyl terminated content of less than 52ppm, and a BPA content of less than 17ppm.

As a preferable scheme, the mass ratio of the hydrophobizing agent to the flame retardant is 1: (5-100).

As a preferable scheme, the mass ratio of the hydrophobizing agent to the flame retardant is 1: (9-16).

Preferably, the anti-dripping agent is polytetrafluoroethylene.

In order to solve the technical problems, the second object of the present application is to provide a preparation method of a halogen-free flame retardant polycarbonate composition, comprising the following steps:

(1) Weighing polycarbonate, ABS, a flame retardant, a toughening agent, a hydrophobing agent and an anti-dripping agent according to the proportion, and stirring and blending in high-speed mixing equipment to obtain a premix;

(2) And (3) carrying out double-screw extrusion and granulation on the premix to obtain the halogen-free flame-retardant polycarbonate composition.

In order to solve the technical problems, the application provides an application of the halogen-free flame retardant polycarbonate composition in the fields of electric, building, transportation means, communication, household appliances, kitchens and bathrooms or automobiles.

Compared with the prior art, the embodiment of the application has the following beneficial effects:

1. according to the application, the hydrophobic agent with a migration three-dimensional molecular structure is added to form an effective barrier between a damp-heat environment and a material, the silicon toughening agent can accelerate migration of the hydrophobic agent to the surface, and meanwhile, the smaller polymerization degree is beneficial to accelerating the migration rate of the hydrophobic agent, so that the toughness reduction caused by negative influence of moisture on the material is reduced, the processing fluidity of the material is improved, and the damp-heat stable material with high flow, thin-wall flame retardance and good appearance is realized.

2. Based on the BDP flame retardant and the hydrophobic agent, the synergistic flame retardant effect is generated, the moisture and heat resistance of the hydrophobic agent is prevented from being reduced due to the fact that the water content of the BDP flame retardant is too high, meanwhile, the BDP flame retardant contains a small amount of water, the reaction rate of the hydrophobic agent can be improved, and the humidity and heat aging resistance can be improved.

3. The halogen-free flame-retardant polycarbonate composition obtained by the application has higher flame retardant grade (1.0 mm, V-0 grade), better mechanical property (ASTM normal temperature notch impact is more than 600J/m) and humid heat aging stability (notch impact strength retention rate is more than 50% after humid heat aging for 500 h), low processing viscosity and no appearance defect, and can meet the appearance quality requirements of various processing technologies.

Detailed Description

The technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

TABLE 1 sources and types of raw materials used in examples and comparative examples of the present application

Example 1

A halogen-free flame retardant polycarbonate composition comprising the following components: 97.3kg of polycarbonate, 0.5kg of ABS, 1kg of BDP flame retardant, 0.01kg of hydrophobing agent, 0.5kg of toughening agent and 0.05kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobizing agent is polyhedral oligomeric silsesquioxane, the polymerization degree of the polyhedral oligomeric silsesquioxane is less than 9, and the brand of OPS1 of Beijing university is specifically selected; the toughening agent is a silicon toughening agent, the silica gel content is more than 8%, the rubber particle size is more than 380nm, and the Mitsubishi Li yang brand S-2130 is specifically selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 1:50, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:100.

example two

A halogen-free flame retardant polycarbonate composition comprising the following components: 19.8kg of polycarbonate, 25kg of ABS, 25kg of BDP flame retardant, 5kg of hydrophobing agent, 20kg of toughening agent and 5kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobizing agent is polyhedral oligomeric silsesquioxane, the polymerization degree of the polyhedral oligomeric silsesquioxane is less than 9, and the brand of OPS1 of Beijing university is specifically selected; the toughening agent is a silicon toughening agent, the silica gel content is more than 8%, the rubber particle size is more than 380nm, and the Mitsubishi Li yang brand S-2130 is specifically selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 1:4, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:5.

example III

A halogen-free flame retardant polycarbonate composition comprising the following components: 92.5kg of polycarbonate, 2kg of ABS, 4kg of BDP flame retardant, 0.1kg of hydrophobing agent, 1kg of toughening agent and 0.2kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobizing agent is polyhedral oligomeric silsesquioxane, the polymerization degree of the polyhedral oligomeric silsesquioxane is less than 9, and the brand of OPS1 of Beijing university is specifically selected; the toughening agent is a silicon toughening agent, the silica gel content is more than 8%, the rubber particle size is more than 380nm, and the Mitsubishi Li yang brand S-2130 is specifically selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 1:10, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:40.

example IV

A halogen-free flame retardant polycarbonate composition comprising the following components: 42.8kg of polycarbonate, 20kg of ABS, 18kg of BDP flame retardant, 3kg of hydrophobing agent, 15kg of toughening agent and 1kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobizing agent is polyhedral oligomeric silsesquioxane, the polymerization degree of the polyhedral oligomeric silsesquioxane is less than 9, and the brand of OPS1 of Beijing university is specifically selected; the toughening agent is a silicon toughening agent, the silica gel content is more than 8%, the rubber particle size is more than 380nm, and the Mitsubishi Li yang brand S-2130 is specifically selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 1:5, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:6.

example five

A halogen-free flame retardant polycarbonate composition comprising the following components: 71kg of polycarbonate, 10kg of ABS, 12kg of BDP flame retardant, 1kg of hydrophobing agent, 5kg of toughening agent and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobing agent is polyhedral oligomeric silsesquioxane, the polymerization degree is less than 9, OPS1 brand of Beijing university is selected, the toughening agent is a silicon toughening agent, the content of silica gel is more than 8%, the particle size of rubber is more than 380nm, and S-2130 brand of Mitsubishi Li Yang is selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 1:5, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:12.

example six

A halogen-free flame retardant polycarbonate composition comprising the following components: 70kg of polycarbonate, 10kg of ABS, 12kg of BDP flame retardant, 2kg of hydrophobing agent, 5kg of toughening agent and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobing agent is polyhedral oligomeric silsesquioxane, the polymerization degree is less than 9, OPS1 brand of Beijing university is selected, the toughening agent is a silicon toughening agent, the content of silica gel is more than 8%, the particle size of rubber is more than 380nm, and S-2130 brand of Mitsubishi Li Yang is selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 2:5, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:6.

example seven

A halogen-free flame retardant polycarbonate composition comprising the following components: 71kg of polycarbonate, 10kg of ABS, 12kg of BDP flame retardant, 3kg of hydrophobing agent, 5kg of toughening agent and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobing agent is polyhedral oligomeric silsesquioxane, the polymerization degree is less than 9, OPS1 brand of Beijing university is selected, the toughening agent is a silicon toughening agent, the content of silica gel is more than 8%, the particle size of rubber is more than 380nm, and S-2130 brand of Mitsubishi Li Yang is selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 3:5, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:4.

example eight

A halogen-free flame retardant polycarbonate composition comprising the following components: 71kg of polycarbonate, 10kg of ABS, 12kg of BDP flame retardant, 4kg of hydrophobing agent, 5kg of toughening agent and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobing agent is polyhedral oligomeric silsesquioxane, the polymerization degree is less than 9, OPS1 brand of Beijing university is selected, the toughening agent is a silicon toughening agent, the content of silica gel is more than 8%, the particle size of rubber is more than 380nm, and S-2130 brand of Mitsubishi Li Yang is selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 4:5, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:3.

example nine

A halogen-free flame retardant polycarbonate composition comprising the following components: 70kg of polycarbonate, 10kg of ABS, 9kg of BDP flame retardant, 1kg of hydrophobing agent, 5kg of toughening agent and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobing agent is polyhedral oligomeric silsesquioxane, the polymerization degree is less than 9, OPS1 brand of Beijing university is selected, the toughening agent is a silicon toughening agent, the content of silica gel is more than 8%, the particle size of rubber is more than 380nm, and S-2130 brand of Mitsubishi Li Yang is selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 1:5, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:9.

examples ten

A halogen-free flame retardant polycarbonate composition comprising the following components: 71kg of polycarbonate, 10kg of ABS, 14kg of BDP flame retardant, 1kg of hydrophobing agent, 5kg of toughening agent and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobing agent is polyhedral oligomeric silsesquioxane, the polymerization degree is less than 9, OPS1 brand of Beijing university is selected, the toughening agent is a silicon toughening agent, the content of silica gel is more than 8%, the particle size of rubber is more than 380nm, and S-2130 brand of Mitsubishi Li Yang is selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 1:5, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:14.

example eleven

A halogen-free flame retardant polycarbonate composition comprising the following components: 71kg of polycarbonate, 10kg of ABS, 16kg of BDP flame retardant, 1kg of hydrophobing agent, 5kg of toughening agent and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is less than or equal to 0.2 percent, and particularly is Wansheng WS-BDP-1; the hydrophobing agent is polyhedral oligomeric silsesquioxane, the polymerization degree is less than 9, OPS1 brand of Beijing university is selected, the toughening agent is a silicon toughening agent, the content of silica gel is more than 8%, the particle size of rubber is more than 380nm, and S-2130 brand of Mitsubishi Li Yang is selected; at this time, the mass ratio of the hydrophobing agent to the toughening agent is 1:5, the mass ratio of the hydrophobing agent to the BDP flame retardant is 1:16.

comparative example one

The halogen-free flame retardant polycarbonate composition used in each step and the reagents and process parameters used in each step are the same as those in the fifth embodiment, except that the BDP flame retardant has a moisture content of 0.23%, and Mo Cheng WS-BDP-2 is specifically selected. Comparative example two

The halogen-free flame-retardant polycarbonate composition is characterized in that the toughening agent is a silicon toughening agent, the content of silica gel is 7.8%, the particle size of rubber is 300nm, and the S-2001 brand of Mitsubishi yang is specifically selected.

Comparative example three

The halogen-free flame retardant polycarbonate composition is the same as the fifth embodiment in each step and the reagents and process parameters used in each step, except that the hydrophobizing agent is replaced by OPS2 brand of Beijing university.

Comparative example four

The halogen-free flame retardant polycarbonate composition, the reagents and the process parameters used in each step are the same as those in the fifth embodiment, except that the hydrophobic agent is replaced by silicone.

Comparative example five

The halogen-free flame retardant polycarbonate composition, the reagents and the process parameters used in each step are the same as those in the fifth embodiment, except that the hydrophobic agent is replaced by PE wax.

Comparative example six

The halogen-free flame retardant polycarbonate composition, the reagents and the process parameters used in each step are the same as those in the fifth embodiment, except that the hydrophobe agent is replaced by PTFE.

The halogen-free flame retardant polycarbonate compositions in the above examples 1-11 and comparative examples 1-6 comprise the following preparation steps:

(1) Weighing polycarbonate, ABS, BDP flame retardant, toughening agent, hydrophobing agent and anti-dripping agent according to the proportion, and stirring and blending in a high-speed mixer to obtain premix;

(2) And (3) carrying out double-screw extrusion and granulation on the premix to obtain the halogen-free flame-retardant polycarbonate composition.

Performance test

1) Flame retardant rating: flammability test according to the protocol of "flammability test of plastics materials, UL94-2013", samples for testing: 125mm length 13mm width, thickness at test 1.0mm, classifying the flame retardant rating of the material as (UL 94-HB): v0, V1, V2, 5VA and/or 5VB, initial flame retardant rating; meanwhile, after the samples were subjected to a heat and humidity aging treatment of 85% at a set temperature of 85 ℃ in a constant temperature and humidity cabinet for 500 hours, the flame retardant rating after heat and humidity aging was measured for 500 hours under the same conditions, and the test results of examples 1 to 11 and comparative examples 1 to 6 were shown in Table 2.

2) Impact strength: IZOD notched impact strength of 3.0mm was tested according to ASTM D256-2010; the notch type is an injection molding notch, and initial impact strength is tested; meanwhile, after the samples were subjected to a wet heat aging treatment of 85% humidity at 85 ℃ in a constant temperature and humidity box for 500 hours, the samples were subjected to a conditioning treatment in an environment of 50% humidity at 25 ℃ for more than 48 hours, and then the retention of the impact strength performance after 500 hours of wet heat aging was measured, and the results were recorded, and the higher the retention of the performance, the better the wet heat stability were, and the test results of examples 1 to 11 and comparative examples 1 to 6 were shown in table 2.

3) Processing fluidity: the high-pressure capillary rheometry was conducted to test the shear viscosity at 5000s-1 and to record as a judgment of the quality of the processing fluidity, wherein the lower the shear viscosity, the better the processing fluidity, the test was conducted for examples 1-11 and comparative examples 1-6, and the test results are shown in Table 2.

TABLE 2 Performance test results for examples 1-11 and comparative examples 1-6

As can be seen from the performance test results of example 5 and comparative example 1 in table 2, the water content of the BDP flame retardant affects the hydrophobic agent reaction process of the polycarbonate material, and when the water content is too high, the wet heat resistance of the hydrophobic agent is reduced, and when the BDP flame retardant contains a small amount of water, the reaction rate of the hydrophobic agent can be improved, the wet heat aging resistance can be improved, and the polycarbonate material has better mechanical properties and flame retardant properties in a high-temperature and high-humidity environment.

As can be seen from the performance test results of example 5 and comparative example 2 in Table 2, the silicon-based toughening agent with large particle size and high silica gel content can improve the surface migration speed of the hydrophobing agent, and meanwhile, an effective crack termination point is formed for the toughness of the matrix material, so that the toughness of the material before and after damp heat is ensured.

As can be seen from the performance detection results of the embodiment 5 and the comparative examples 3-6 in the table 2, the application forms an effective barrier between the damp and hot environment and the material by adding the hydrophobic agent with a migration three-dimensional molecular structure, and the BDP flame retardant is used for synergistically retarding flame, so that the thin-wall flame-retardant stability of the material can be further improved, the presence of the toughening agent can accelerate the migration of the hydrophobic agent to the surface, and meanwhile, a sufficient toughness network is formed in the matrix, the toughness reduction caused by the negative influence of moisture on the material is reduced, and the processing fluidity of the material can be improved by adding the hydrophobic agent and the hydrophobic agent, so that the high-flow, thin-wall flame-retardant and good-appearance damp and heat stable material is realized.

As can be seen from the performance detection results of examples 5-8 in Table 2, the application specifically limits the ratio of the hydrophobing agent to the toughening agent, reflects the synergistic effect between the hydrophobing agent and the toughening agent, and further improves the surface migration speed of the hydrophobing agent, accelerates the generation of a hydrophobic protective film, reduces the toughness reduction caused by the negative influence of moisture on the material, and enhances the stability of the material against humid heat aging.

The combination of the performance detection results of examples 5 and 9-11 in table 2 shows that the application specifically limits the ratio of the water repellent agent to the BDP flame retardant, reflects that the water repellent agent can realize the synergistic characteristic of BDP flame retardance, has further stability on thin-wall flame retardance on the premise of further improving the processing fluidity of the material, has obvious improving effect on the water repellency, and is suitable for the development trend of the thinned material.

The halogen-free flame-retardant polycarbonate composition obtained by the application has excellent wet heat aging resistance and higher flame retardant property and mechanical property, and can be applied to the fields of electric, building, transportation means, communication, household appliances, kitchens and bathrooms or automobiles.

The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present application, and are not to be construed as limiting the scope of the application. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present application are intended to be included in the scope of the present application.

Claims (10)

1. The halogen-free flame-retardant polycarbonate composition is characterized by comprising the following components in parts by weight:

polycarbonate: 19-98 parts;

ABS: 0.5-25 parts;

flame retardant: 1-25 parts;

hydrophobing agent: 0.01-5 parts;

toughening agent: 0.5-20 parts;

anti-drip agent: 0.05-5 parts;

wherein the hydrophobizing agent is polyhedral oligomeric silsesquioxane, and the polymerization degree is less than 9; the toughening agent is a silicon toughening agent, the silica gel content is more than 8%, the rubber particle size is more than 380nm, and the moisture content of the flame retardant is below 0.2%.

2. A halogen-free flame retardant polycarbonate composition as defined in claim 1, wherein said ABS has a gum content of 8% to 30%.

3. The halogen-free flame retardant polycarbonate composition of claim 1, comprising the following components in parts by weight:

polycarbonate: 42-93 parts;

ABS: 2-20 parts;

flame retardant: 4-18 parts;

hydrophobing agent: 0.1-3 parts;

toughening agent: 1-15 parts;

anti-drip agent: 0.2-1 part of the flame retardant, wherein the flame retardant is BDP flame retardant.

4. The halogen-free flame retardant polycarbonate composition of claim 1, wherein the mass ratio of the hydrophobizing agent to the toughening agent is (1-3): (4-50).

5. The halogen-free, flame retardant polycarbonate composition of claim 1, wherein the polycarbonate has an average molecular weight of 20000-25000, a hydroxyl terminated content of less than 52ppm, and a bpa content of less than 17ppm.

6. The halogen-free flame retardant polycarbonate composition of claim 1, wherein the mass ratio of the hydrophobizing agent to the flame retardant is 1: (5-100).

7. The halogen-free flame retardant polycarbonate composition of claim 6, wherein the mass ratio of the hydrophobizing agent to the flame retardant is 1: (9-16).

8. A halogen-free, flame retardant polycarbonate composition as defined in claim 1, wherein said anti-drip agent is polytetrafluoroethylene.

9. A method for preparing a halogen-free flame retardant polycarbonate composition, characterized by comprising the steps of:

(1) Weighing polycarbonate, ABS, a flame retardant, a toughening agent, a hydrophobing agent and an anti-dripping agent according to the proportion, and stirring and blending in high-speed mixing equipment to obtain a premix;

(2) And (3) carrying out double-screw extrusion and granulation on the premix to obtain the halogen-free flame-retardant polycarbonate composition.

10. Use of the halogen-free flame retardant polycarbonate composition of any of claims 1-8 in the electrical, construction, transportation, communication, household appliance, kitchen or automotive fields.