A halogen-free flame-retardant polycarbonate composition and its preparation method and application

Abstract

The present invention discloses a halogen-free flame-retardant polycarbonate composition and its preparation method and application, and relates to the field of engineering plastics. It includes the following raw materials by weight: polycarbonate: 19 parts-98 parts; ABS: 0.5 parts-25 parts; flame retardant: 1 parts-25 parts; hydrophobic agent: 0.01 parts-5 parts; toughening agent: 0.5 parts-20 parts; anti-dripping agent: 0.05 parts-5 parts; the hydrophobic agent is OPS1, and the toughening agent is a silicon-based toughening agent, and its silica gel content is greater than 8%, its rubber particle size is greater than 380nm, and the moisture content of the flame retardant is less than 0.2%. The present application adds a hydrophobic agent with a three-dimensional molecular structure with mobility to form an effective barrier between a humid and hot environment and a material. The presence of a silicon-based toughening agent can accelerate the migration of the hydrophobic agent to the surface, and based on the flame retardant synergistic flame retardant effect, the processing fluidity of the material is improved, and a high-flow, thin-walled flame-retardant, and good-looking humid and hot stable material is achieved.

Description

Technical Field

[0001] The invention relates to the field of engineering plastics, and in particular to a halogen-free flame-retardant polycarbonate composition and a preparation method and application thereof. Background Art

[0002] Polycarbonate ABS alloy is an engineering plastic alloy developed in the mid-1960s. It has the excellent mechanical properties, heat resistance and electrical properties of polycarbonate, and the excellent processing properties of ABS. It is widely used in home appliances, automobiles, electronic and electrical products, etc. Due to the presence of ester groups in the molecular chain of the material, if the material encounters water molecules in a high temperature environment, the water molecules will turn into steam and penetrate into the material molecules, promoting the hydrolysis reaction of the material, making the material brittle, and the mechanical properties and flame retardant properties are seriously affected, thus limiting the application of polycarbonate ABS in high temperature and high humidity environments.

[0003] Therefore, in order to meet the needs of technological updates and changes in the application of polycarbonate ABS alloy materials, it is necessary to have stable moisture and heat aging stability and ensure sufficient mechanical properties during service. The current moisture and heat resistance, flame retardant and toughening technologies all have certain limitations. Adding any component to polycarbonate may lead to a decrease in moisture and heat aging stability and cannot provide a guarantee for the service safety of mechanical properties. This is especially problematic for the current application fields with extremely high performance requirements such as consumer electronics, new energy vehicles, and outdoor communications, which plague the high-performance development of materials. Summary of the invention

[0004] The present invention provides a halogen-free flame-retardant polycarbonate composition and a preparation method and application thereof, so as to solve the technical problem that the flame retardancy and mechanical properties of the material are seriously reduced in a hot and humid environment.

[0005] In order to solve the above technical problems, one of the purposes of the present invention is to provide a halogen-free flame retardant polycarbonate composition, comprising the following components in parts by weight:

[0006] Polycarbonate: 19-98 parts;

[0007] ABS: 0.5-25 parts;

[0008] Flame retardant: 1-25 parts;

[0009] Hydrophobic agent: 0.01-5 parts;

[0010] Toughening agent: 0.5-20 parts;

[0011] Anti-dripping agent: 0.05-5 parts;

[0012] The hydrophobic agent is polyhedral oligomeric silsesquioxane (POSS) with a polymerization degree of less than 9; the toughening agent is a silicon-based toughening agent with a silica gel content greater than 8% and a rubber particle size greater than 380nm; and the moisture content of the flame retardant is less than 0.2%.

[0013] By adopting the above scheme, the present application forms an effective barrier between the humid and hot environment and the material by adding a hydrophobic agent with a mobile three-dimensional molecular structure, forming a super hydrophobic surface. The presence of a silicon-based toughening agent with a large particle size and a large silica content can accelerate the migration of the hydrophobic agent to the surface. At the same time, a smaller degree of polymerization is beneficial to the migration rate of the hydrophobic agent, and a sufficient toughness network can be formed inside the matrix to reduce the toughness reduction caused by the negative impact of moisture on the material. The addition of both can improve the processing fluidity of the material; based on the synergistic flame retardant effect produced by the BDP flame retardant and the hydrophobic agent, the high or low water content of the BDP flame retardant has an effect on the hydrophobic agent of the polycarbonate material. The reaction process is affected to avoid excessive water content which leads to a decrease in the moisture and heat resistance of the hydrophobic agent. At the same time, the small amount of water contained in the BDP flame retardant can promote the reaction rate of the hydrophobic agent, improve the moisture and heat aging resistance, and maintain the good mechanical properties and flame retardant properties of the polycarbonate material under high temperature and high humidity environment; Silsesquioxane has a certain volume and space effect, good processing fluidity, good water and thermal stability, and at the same time, it has a highly efficient flame retardant synergistic effect. It can form a ternary complementary system with the flame retardant toughening agent to improve the stability of the moisture and heat aging properties of the material, so as to obtain a moisture and heat stable material with high flow, thin-wall flame retardancy and good appearance.

[0014] As a preferred embodiment, the flame retardant is BDP flame retardant.

[0015] As a preferred solution, the glue content of the ABS is 8%-30%.

[0016] As a preferred embodiment, the invention comprises the following components in parts by weight:

[0017] Polycarbonate: 42-93 parts;

[0018] ABS: 2-20 copies;

[0019] Flame retardant: 4-18 parts;

[0020] Hydrophobic agent: 0.1-3 parts;

[0021] Toughening agent: 1-15 parts;

[0022] Anti-drip agent: 0.2 part to 1 part.

[0023] As a preferred embodiment, the mass ratio of the hydrophobic agent to the toughening agent is (1-3): (4-50).

[0024] As a preferred embodiment, the average molecular weight of the polycarbonate is 20,000-25,000, the terminal hydroxyl content is less than 52 ppm, and the BPA content is less than 17 ppm.

[0025] As a preferred embodiment, the mass ratio of the hydrophobic agent to the flame retardant is 1:(5-100).

[0026] As a preferred embodiment, the mass ratio of the hydrophobic agent to the flame retardant is 1:(9-16).

[0027] As a preferred embodiment, the anti-dripping agent is polytetrafluoroethylene.

[0028] In order to solve the above technical problems, the second object of the present invention is to provide a method for preparing a halogen-free flame retardant polycarbonate composition, comprising the following steps:

[0029] (1) weighing polycarbonate, ABS, flame retardant, toughening agent, hydrophobic agent and anti-dripping agent according to a ratio and stirring and blending them in a high mixing device to obtain a premix;

[0030] (2) The premix is ​​subjected to twin-screw extrusion and granulation steps to obtain a halogen-free flame-retardant polycarbonate composition.

[0031] In order to solve the above technical problems, the third object of the present invention provides a halogen-free flame retardant polycarbonate composition for use in electrical, construction, transportation, communication, home appliances, kitchen and bathroom or automotive fields.

[0032] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0033] 1. This application forms an effective barrier between the wet and hot environment and the material by adding a hydrophobic agent with a mobile three-dimensional molecular structure. The presence of a silicon-based toughening agent can accelerate the migration of the hydrophobic agent to the surface. At the same time, a smaller degree of polymerization is conducive to accelerating the migration rate of the hydrophobic agent, reducing the toughness reduction caused by the negative impact of moisture on the material, and improving the processing fluidity of the material, thereby achieving a high-flow, thin-walled, flame-retardant, and good-appearance wet and hot stable material.

[0034] 2. The synergistic flame retardant effect between BDP flame retardant and hydrophobic agent can avoid the excessively high water content of BDP flame retardant which may lead to a decrease in the moisture and heat resistance of the hydrophobic agent. At the same time, the small amount of water contained in BDP flame retardant can promote the reaction rate of the hydrophobic agent and improve the moisture and heat resistance aging performance.

[0035] 3. The halogen-free flame-retardant polycarbonate composition obtained in the present application has a high flame retardant grade (1.0mm, V-0 grade), better mechanical properties (ASTM room temperature notched impact greater than 600J / m) and wet heat aging stability (notched impact strength retention rate after wet heat aging for 500h is greater than 50%), low processing viscosity and no appearance defects, and can meet the appearance quality requirements of various processing techniques. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 are within the scope of protection of the present invention.

[0037] Table 1 - Sources and models of raw materials used in the examples and comparative examples of this application

[0038]

[0039]

[0040] Embodiment 1

[0041] A halogen-free flame-retardant polycarbonate composition comprises the following components: 97.3kg of polycarbonate, 0.5kg of ABS, 1kg of BDP flame retardant, 0.01kg of hydrophobic agent, 0.5kg of toughening agent, and 0.05kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, and is specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose polymerization degree is less than 9, and is specifically selected from the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, and is specifically selected from the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 1:50, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:100.

[0042] Embodiment 2

[0043] A halogen-free flame-retardant polycarbonate composition comprises the following components: 19.8kg of polycarbonate, 25kg of ABS, 25kg of BDP flame retardant, 5kg of hydrophobic agent, 20kg of toughening agent, and 5kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose polymerization degree is less than 9, specifically the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, specifically the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 1:4, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:5.

[0044] Embodiment 3

[0045] A halogen-free flame-retardant polycarbonate composition comprises the following components: 92.5kg of polycarbonate, 2kg of ABS, 4kg of BDP flame retardant, 0.1kg of hydrophobic agent, 1kg of toughening agent, and 0.2kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, and is specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose polymerization degree is less than 9, and is specifically the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, and is specifically the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 1:10, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:40.

[0046] Embodiment 4

[0047] A halogen-free flame-retardant polycarbonate composition comprises the following components: 42.8kg of polycarbonate, 20kg of ABS, 18kg of BDP flame retardant, 3kg of hydrophobic agent, 15kg of toughening agent, and 1kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, and is specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose degree of polymerization is less than 9, and is specifically the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, and is specifically the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 1:5, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:6.

[0048] Embodiment 5

[0049] A halogen-free flame-retardant polycarbonate composition comprises the following components: 71kg of polycarbonate, 10kg of ABS, 12kg of BDP flame retardant, 1kg of hydrophobic agent, 5kg of toughening agent, and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose polymerization degree is less than 9, specifically the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, specifically the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 1:5, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:12.

[0050] Embodiment 6

[0051] A halogen-free flame-retardant polycarbonate composition comprises the following components: 70kg of polycarbonate, 10kg of ABS, 12kg of BDP flame retardant, 2kg of hydrophobic agent, 5kg of toughening agent, and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose polymerization degree is less than 9, specifically the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, specifically the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 2:5, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:6.

[0052] Embodiment 7

[0053] A halogen-free flame-retardant polycarbonate composition comprises the following components: 71kg of polycarbonate, 10kg of ABS, 12kg of BDP flame retardant, 3kg of hydrophobic agent, 5kg of toughening agent, and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose polymerization degree is less than 9, specifically the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, specifically the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 3:5, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:4.

[0054] Embodiment 8

[0055] A halogen-free flame-retardant polycarbonate composition comprises the following components: 71kg of polycarbonate, 10kg of ABS, 12kg of BDP flame retardant, 4kg of hydrophobic agent, 5kg of toughening agent, and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose polymerization degree is less than 9, specifically the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, specifically the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 4:5, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:3.

[0056] Embodiment 9

[0057] A halogen-free flame-retardant polycarbonate composition comprises the following components: 70kg of polycarbonate, 10kg of ABS, 9kg of BDP flame retardant, 1kg of hydrophobic agent, 5kg of toughening agent, and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose polymerization degree is less than 9, specifically the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, specifically the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 1:5, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:9.

[0058] Embodiment 10

[0059] A halogen-free flame-retardant polycarbonate composition comprises the following components: 71kg of polycarbonate, 10kg of ABS, 14kg of BDP flame retardant, 1kg of hydrophobic agent, 5kg of toughening agent, and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose polymerization degree is less than 9, specifically the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, specifically the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 1:5, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:14.

[0060] Embodiment 11

[0061] A halogen-free flame-retardant polycarbonate composition comprises the following components: 71kg of polycarbonate, 10kg of ABS, 16kg of BDP flame retardant, 1kg of hydrophobic agent, 5kg of toughening agent, and 0.8kg of anti-dripping agent; wherein the moisture content of the BDP flame retardant is ≤0.2%, specifically Wansheng WS-BDP-1; the hydrophobic agent is a polyhedral oligomeric silsesquioxane, whose polymerization degree is less than 9, specifically the OPS1 brand of Beijing Institute of Technology; the toughening agent is a silicon-based toughening agent, whose silica gel content is greater than 8%, and whose rubber particle size is greater than 380nm, specifically the S-2130 brand of Mitsubishi Rayon; at this time, the mass ratio of the hydrophobic agent to the toughening agent is 1:5, and the mass ratio of the hydrophobic agent to the BDP flame retardant is 1:16.

[0062] Comparative Example 1

[0063] A halogen-free flame-retardant polycarbonate composition, wherein each step, reagents used in each step, and process parameters are the same as those in Example 5, except that the moisture content of the BDP flame retardant is 0.23%, and specifically, Wansheng WS-BDP-2 is selected.

[0064] A halogen-free flame-retardant polycarbonate composition, wherein each step, the reagents used in each step, and the process parameters are the same as those in Example 5, except that the toughening agent is a silicon-based toughening agent, the silica gel content is 7.8%, the rubber particle size is 300 nm, and specifically, Mitsubishi Rayon's S-2001 brand is selected.

[0065] Comparative Example 3

[0066] A halogen-free flame-retardant polycarbonate composition, wherein each step, reagents used in each step, and process parameters are the same as those in Example 5, except that the hydrophobic agent is replaced by the OPS2 brand of Beijing Institute of Technology.

[0067] Comparative Example 4

[0068] A halogen-free flame-retardant polycarbonate composition, wherein each step, reagents used in each step, and process parameters are the same as those in Example 5, except that the hydrophobic agent is replaced by silicone.

[0069] Comparative Example 5

[0070] A halogen-free flame-retardant polycarbonate composition, wherein each step, reagents used in each step, and process parameters are the same as those in Example 5, except that the hydrophobic agent is replaced by PE wax.

[0071] Comparative Example 6

[0072] A halogen-free flame-retardant polycarbonate composition, wherein each step, reagents used in each step, and process parameters are the same as those in Example 5, except that the hydrophobic agent is replaced by PTFE.

[0073] The halogen-free flame retardant polycarbonate compositions in the above-mentioned Examples 1-11 and Comparative Examples 1-6 include the following preparation steps:

[0074] (1) weighing polycarbonate, ABS, BDP flame retardant, toughening agent, hydrophobic agent and anti-dripping agent according to the proportion, stirring and blending in a high-speed mixer to obtain a premix;

[0075] (2) The premix is ​​subjected to twin-screw extrusion and granulation steps to obtain a halogen-free flame-retardant polycarbonate composition.

[0076] Performance testing

[0077] 1) Flame retardant grade: The flammability test was carried out according to the procedure of "Flammability Test of Plastic Materials, UL94-2013". The sample used for the test was 125 mm in length and 13 mm in width. The thickness during the test was selected as 1.0 mm. The flame retardant grade of the material was classified into (UL94-HB): V0, V1, V2, 5VA and / or 5VB, and the initial flame retardant grade was measured; at the same time, the sample was measured after being subjected to a heat aging treatment at a set temperature of 85° C. and a humidity of 85% for 500 h in a constant temperature and humidity chamber, and the flame retardant grade after heat aging for 500 h was measured under the same conditions. Examples 1-11 and Comparative Examples 1-6 were tested, and the test results are shown in Table 2.

[0078] 2) Impact strength: According to the ASTM D256-2010 standard, the 3.0 mm IZOD notch impact strength was tested; the notch type was an injection molding notch, and the initial impact strength was tested; at the same time, the sample was subjected to a heat aging treatment at a set temperature of 85° C. and a humidity of 85% in a constant temperature and humidity chamber for 500 h, and then placed in an environment of room temperature of 25° C. and a humidity of 50% for conditioning for more than 48 h, and then the impact strength performance retention rate after heat aging for 500 h was tested, and the results were recorded. The higher the performance retention rate, the better the heat stability. Examples 1-11 and Comparative Examples 1-6 were tested, and the test results are shown in Table 2.

[0079] 3) Processing fluidity: The shear viscosity at 5000 s-1 was tested by high pressure capillary rheology and recorded as a criterion for judging the processing fluidity. The lower the shear viscosity, the better the processing fluidity. Examples 1-11 and Comparative Examples 1-6 were tested, and the test results are shown in Table 2.

[0080] Table 2 - Performance test results of Examples 1-11 and Comparative Examples 1-6

[0081]

[0082] Combining the performance test results of Example 5 and Comparative Example 1 in Table 2, it can be seen that the water content of the BDP flame retardant affects the reaction process of the hydrophobic agent of the polycarbonate material. Too high a water content will cause the moisture and heat resistance of the hydrophobic agent to decrease. When the BDP flame retardant contains a small amount of water, it can promote the reaction rate of the hydrophobic agent, improve the moisture and heat aging resistance, and maintain the polycarbonate material in a high temperature and high humidity environment. Good mechanical properties and flame retardant properties.

[0083] Combining the performance test results of Example 5 and Comparative Example 2 in Table 2, it can be seen that the silicon-based toughening agent with a large particle size and a high silica gel content can increase the surface migration rate of the hydrophobic agent, and at the same time form an effective crack termination point for the toughness of the matrix material, thereby ensuring the toughness of the material before and after wet heat.

[0084] Combining the performance test results of Example 5 and Comparative Examples 3-6 in Table 2, it can be seen that the present application forms an effective barrier between the wet and hot environment and the material by adding a hydrophobic agent with a mobile three-dimensional molecular structure. Based on the synergistic flame retardant of the BDP flame retardant, 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 at the same time form a sufficient toughness network inside the matrix to reduce the toughness reduction caused by the negative impact of moisture on the material. The addition of both can improve the processing fluidity of the material, and realize a high-flow, thin-wall flame-retardant, and wet-heat-stable material with good appearance.

[0085] Combined with the performance test results of Examples 5-8 in Table 2, it can be seen that the present application specifically defines the ratio of the hydrophobic agent to the toughening agent, reflecting the synergistic effect between the hydrophobic agent and the toughening agent. The toughening agent further increases the surface migration speed of the hydrophobic agent, accelerates the formation of the hydrophobic protective film, reduces the toughness reduction caused by the negative impact of moisture on the material, and enhances the material's resistance to moisture and heat aging stability.

[0086] Combined with the performance test results of Examples 5, 9-11 in Table 2, it can be seen that the present application specifically defines the ratio of the hydrophobic agent to the BDP flame retardant, which reflects that the hydrophobic agent can achieve the synergistic characteristics of the BDP flame retardant. On the premise of further improving the processing fluidity of the material, it has further stability for the thin-wall flame retardant, and at the same time has a significant improvement effect on the hydrophobicity, which is suitable for the development trend of thin-walled materials.

[0087] The halogen-free flame-retardant polycarbonate composition obtained in the present application has excellent resistance to moist heat aging, high flame retardancy and mechanical properties, and can be used in the electrical, construction, transportation, communication, home appliances, kitchen and bathroom or automotive fields.

[0088] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A halogen-free flame-retardant polycarbonate composition, characterized in that: It comprises the following components in parts by weight: Polycarbonate: 19-98 parts; ABS: 0.5-25 parts; Flame retardant: 1-25 parts; Hydrophobic agent: 0.01-5 parts; Toughening agent: 0.5-20 parts; Anti-dripping agent: 0.05-5 parts; Wherein, the hydrophobic agent is a polyhedral oligomeric silsesquioxane, and its polymerization degree is less than 9; the toughening agent is a silicon-based toughening agent, and its silica gel content is greater than 8%, and its rubber particle size is greater than 380nm; the moisture content of the flame retardant is less than 0.2%; The flame retardant is a BDP flame retardant; the mass ratio of the hydrophobic agent to the toughening agent is (1-3):(4-50) or 4:5; the mass ratio of the hydrophobic agent to the flame retardant is 1:(5-100) or 1:3 or 1:

4.

2. A halogen-free flame-retardant polycarbonate composition according to claim 1, characterized in that: The glue content of the ABS is 8%-30%.

3. The halogen-free flame-retardant polycarbonate composition according to claim 1, characterized in that: It comprises the following components in parts by weight: Polycarbonate: 42-93 parts; ABS: 2-20 copies; Flame retardant: 4-18 parts; Hydrophobic agent: 0.1-3 parts; Toughening agent: 1-15 parts; Anti-drip agent: 0.2 part to 1 part.

4. The halogen-free flame-retardant polycarbonate composition according to claim 1, characterized in that: The average molecular weight of the polycarbonate is 20000-25000, the terminal hydroxyl content is lower than 52ppm, and the BPA content is lower than 17ppm.

5. The halogen-free flame-retardant polycarbonate composition according to claim 1, characterized in that: The mass ratio of the hydrophobic agent to the flame retardant is 1:(9-16).

6. The halogen-free flame-retardant polycarbonate composition according to claim 1, characterized in that: The anti-drip agent is polytetrafluoroethylene.

7. A method for preparing a halogen-free flame-retardant polycarbonate composition, characterized in that: The method for preparing a halogen-free flame-retardant polycarbonate composition as claimed in any one of claims 1 to 6 comprises the following steps: (1) weighing polycarbonate, ABS, flame retardant, toughening agent, hydrophobic agent and anti-dripping agent according to a ratio and stirring and blending them in a high mixing device to obtain a premix; (2) The premix is ​​subjected to twin-screw extrusion and granulation steps to obtain a halogen-free flame-retardant polycarbonate composition.

8. Use of the halogen-free flame-retardant polycarbonate composition according to any one of claims 1 to 6 in the fields of electricity, construction, transportation, communication, home appliances, kitchen and bathroom or automobile.

Images