Polycarbonate with high thermal stability and strong aging resistance and preparation method thereof

Abstract

The invention relates to a composite material preparation technology, and particularly discloses polycarbonate with high thermal stability and strong aging resistance and a preparation method thereof, and the polycarbonate is prepared from the following raw materials in parts by weight: 30-80 parts of high chlorinated polyethylene, 5-30 parts of conductive fiber, 5-10 parts of flame retardant and 1-3 parts of dispersing agent. Compared with the prior art, the polycarbonate prepared by the invention contains the polyacrylonitrile carbon fibers coated with the carbon nanotubes, and the polyacrylonitrile carbon fibers have good three-dimensional network property, conductivity and compatibility, and form a stable conductive network, so that the polycarbonate has an antistatic effect; the high chlorinated polyethylene and the novel flame retardant component greatly improve the thermal stability, the thermal aging resistance, the flame resistance and the flame retardance of the polycarbonate.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of functional filled polycarbonate, in particular to a polycarbonate with high thermal stability and strong anti-aging property and a preparation method thereof. BACKGROUND

[0002] Polycarbonate is widely used in the field of optical transparent parts such as automobile lamp, signal lamp and protective plate due to its excellent light transmittance, mechanical strength and impact toughness. Most of the optical transparent parts are prepared by injection molding process, which requires long time high temperature residence, and therefore has high requirements for the thermal stability and anti-aging property of PC material.

[0003] In order to improve the heat resistance of polycarbonate material, the polycarbonate matrix is usually modified by adding copolymer groups and heat-resistant agents during production. For example, the patent CN113929894 A "a heat-resistant polycarbonate copolymer and its preparation method and application" obtains a heat-resistant polycarbonate copolymer by adding bisphenol TM C monomer. The patent CN102311623 A "a heat-resistant polycarbonate composite material and its preparation method" obtains a heat-resistant polycarbonate composite material by adding heat-resistant agents and cross-linking agents. Although the above methods improve the heat distortion temperature and Vicat softening point of polycarbonate, the introduction of a large amount of other organic groups will obviously affect the subsequent surface coating and composite process of transparent molded parts, and such materials are not desirable for high thickness and high optical transparent parts such as ship covers and protective helmets. Such materials increase the application risk and application cost, and the quality fluctuation of the modified additives directly affects the use quality and application effect of the products.

[0004] In order to improve the anti-aging property of polycarbonate material, organic and inorganic additives or modified copolymers are usually added. For example, the patent CN115678238 A "an anti-aging polycarbonate material and its preparation process" adds a composite material composed of nano-titanium dioxide and silicon dioxide on the basis of adding antioxidants, ultraviolet light absorbers and light stabilizers in the polycarbonate matrix. The patent CN113214625 A "a weather-resistant and anti-aging polycarbonate material for 5G base station" adds a polyester-polysiloxane copolymer. The patent CN115806734 A "an anti-aging polycarbonate automobile lampshade and its preparation process" adds a branched polycarbonate. Although the above methods have improved the anti-aging property of polycarbonate material, the titanium dioxide and silicon dioxide in the first method will obviously reduce the light transmittance of the material, and the introduction of new groups in the second and third methods belongs to the modification method, and the light transmittance is also greatly reduced. There are problems of high cost and great uncertainty in the application process.

[0005] With the increasing production capacity of polycarbonate and the continuous development of downstream application fields, the demand for high thermal stability and anti-aging polycarbonate materials has also increased significantly, therefore the present application provides a high thermal stability and strong anti-aging polycarbonate and its preparation method. SUMMARY

[0006] The main purpose of the present application is to provide a thermal stability polycarbonate with flame retardant and antistatic properties and its preparation method, to solve the problem that the flame retardant and antistatic sizing material in the prior art cannot simultaneously have good flame retardant and antistatic properties. In order to achieve the above-mentioned purpose, according to the present application, a thermal stability polycarbonate with flame retardant and antistatic properties is provided, an antistatic and flame retardant functional polycarbonate, comprising the following raw materials by weight: high-chlorinated polyethylene 30-80 parts, conductive fiber 5-30 parts, new flame retardant 5-10 parts, dispersant 1-3 parts, bisphenol A 200-240 parts and carbonic acid derivative 200-240 parts.

[0007] As a preferred scheme of the present application, the conductive fiber is polyacrylonitrile carbon fiber coated with carbon nanotubes, and the new flame retardant includes the following components by weight: powder methyl MQ silicone resin 70-80 parts, anhydrous zinc borate 7.5-16 parts, dispersant 0.3-0.8 parts, rheological agent 0.16-0.5 parts, coupling agent 1-2 parts.

[0008] As a preferred scheme of the present application, the preparation method of the new flame retardant includes the following steps: A. Put the powder methyl MQ silicone resin into the normal temperature and gravity-free mixer, add the coupling agent, and stir for 5 min; B. Put the powder obtained in step A into the gravity-free mixer heated to 120-140°C and stir, when the material temperature reaches 130°C, pour in the anhydrous zinc borate, dispersant and rheological agent, continue to mix for 5 min, discharge and cool to obtain the new flame retardant.

[0009] As a preferred scheme of the present application, the preparation method of the conductive fiber includes the following steps: S1. Dissolve a certain amount of polyacrylonitrile in N,N-dimethylformamide to form a polyacrylonitrile solution; S2. Add carbon nanotubes to the polyacrylonitrile solution obtained in step S1 and perform ultrasonic dispersion to obtain a spinning dope; S3. Perform electrospinning on the spinning dope obtained in step S2 to obtain polyacrylonitrile fiber coated with carbon nanotubes; S4. Pre-oxidize the polyacrylonitrile fiber coated with carbon nanotubes, and then heat and carbonize in an inert gas atmosphere to obtain the polyacrylonitrile carbon fiber coated with carbon nanotubes.

[0010] In a preferred embodiment of the present invention, the dispersant is composed of polyethylene wax and calcium stearate in a weight ratio of 1 to 3:1.

[0011] This invention also provides a method for preparing polycarbonate with high thermal stability and strong anti-aging properties, using the aforementioned raw materials and comprising the following steps: A. Bisphenol A and a carbonate derivative in corresponding mass fractions are subjected to a polycondensation reaction under polymerization conditions to obtain a polycarbonate product. B. Preparation of novel flame retardants; C. Mechanically mix the corresponding mass proportions of high-chlorinated polyethylene, conductive fiber, novel flame retardant, dispersant and polycarbonate product to obtain the finished product.

[0012] This invention utilizes the principle of polyacrylonitrile electrospinning to first prepare polyacrylonitrile fibers coated with carbon nanotubes, and then through carbonization, to produce polyacrylonitrile carbon fibers coated with carbon nanotubes with a high aspect ratio, which is helpful for the construction of three-dimensional conductive networks.

[0013] In this invention, the mass percentage concentration of polyacrylonitrile in the polyacrylonitrile solution is 15-25%, and the mass ratio of carbon nanotubes to the polyacrylonitrile solution is 1:10-14. By controlling the mass percentage concentration of the polyacrylonitrile solution and the proportion of carbon nanotubes, this invention can facilitate the spinning of polyacrylonitrile fibers with a high aspect ratio and achieve better dispersibility of carbon nanotubes in the polyacrylonitrile fibers.

[0014] In step S3, the electrospinning voltage is 10~30 kV and the spinning temperature is room temperature.

[0015] In step S4, the pre-oxidation temperature is 200~350°C and the pre-oxidation time is 1~3 h; the carbonization temperature is 600~1000°C and the carbonization time is 1~3 h.

[0016] The dispersant is composed of polyethylene wax and calcium stearate in a weight ratio of 1 to 3:1.

[0017] The preparation method of the antistatic polycarbonate of this invention is as follows: the raw materials are mixed, melt-extruded, and granulated. The functional polycarbonate of this invention has good antistatic properties, flame retardancy, and durability.

[0018] The beneficial effects of this invention are as follows: This invention utilizes polyacrylonitrile carbon fibers to coat carbon nanotubes. Polyacrylonitrile carbon fibers possess excellent three-dimensional network properties, certain conductivity, and good compatibility with polyethylene, enabling carbon nanotubes to form a stable conductive network within polyethylene, thereby providing antistatic properties. Furthermore, polyacrylonitrile, as the main component of the conductive network, also reinforces the antistatic polycarbonate. In addition, the components of the novel flame retardant are fully mixed within the conductive fiber skeleton, further enhancing the heat resistance and flame retardant properties of the active ingredients, and also giving the antistatic polycarbonate flame-retardant function. Detailed Implementation

[0019] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention. Example

[0020] An antistatic and flame-retardant functional polycarbonate comprises the following raw materials in parts by weight: 80 parts of high-chlorinated polyethylene, 30 parts of conductive fiber, 7 parts of flame retardant and 2 parts of dispersant.

[0021] The conductive fiber is polyacrylonitrile carbon fiber coated with carbon nanotubes, and the flame retardant is composed of the following components by weight: 75 parts of powdered methyl MQ silicone resin, 10 parts of anhydrous zinc borate, 0.5 parts of dispersant, 0.3 parts of rheology modifier, and 1.2 parts of coupling agent.

[0022] The preparation method of the flame retardant includes the following steps: A. Place the powdered methyl MQ silicone resin into a room temperature zero-gravity mixer, add the coupling agent, and stir for 5 minutes; B. Place the powder obtained in step A into a gravity-free mixer heated to 120~140°C and stir. When the material temperature reaches 130°C, pour in anhydrous zinc borate, dispersant and rheology modifier, continue mixing for 5 minutes, discharge and cool to obtain the new flame retardant.

[0023] The method for preparing the conductive fiber includes the following steps: S1. Dissolve polyacrylonitrile in a certain amount of N,N-dimethylformamide to form a polyacrylonitrile solution; S2. Add carbon nanotubes to the polyacrylonitrile solution obtained in step S1 and disperse them ultrasonically to obtain the spinning solution. S3. Electrospin the spinning solution obtained in step S2 to obtain polyacrylonitrile fibers coated with carbon nanotubes. S4. The polyacrylonitrile fiber coated with carbon nanotubes is pre-oxidized and then heated and carbonized in an inert gas atmosphere to obtain the polyacrylonitrile carbon fiber coated with carbon nanotubes.

[0024] The polyacrylonitrile solution contains 15% polyacrylonitrile by mass, and the mass ratio of carbon nanotubes to the polyacrylonitrile solution is 1:10.

[0025] In step S3, the electrospinning voltage is 20 kV and the spinning temperature is room temperature.

[0026] In step S4, the pre-oxidation temperature is 270°C and the pre-oxidation time is 2 h; the carbonization temperature is 1000°C and the carbonization time is 2 h.

[0027] The dispersant is composed of polyethylene wax and calcium stearate in a weight ratio of 1:1.

[0028] The method for preparing the antistatic polycarbonate of the present invention is as follows: take each raw material and perform melt extrusion granulation. Example

[0029] An antistatic and flame-retardant functional polycarbonate comprises the following raw materials in parts by weight: 80 parts of high-chlorinated polyethylene, 25 parts of conductive fiber, 7 parts of flame retardant and 2 parts of dispersant.

[0030] The conductive fiber is polyacrylonitrile carbon fiber coated with carbon nanotubes, and the flame retardant is composed of the following components by weight: 75 parts of powdered methyl MQ silicone resin, 10 parts of anhydrous zinc borate, 0.5 parts of dispersant, 0.3 parts of rheology modifier, and 1.2 parts of coupling agent.

[0031] The preparation method of the flame retardant includes the following steps: A. Place the powdered methyl MQ silicone resin into a room temperature zero-gravity mixer, add the coupling agent, and stir for 5 minutes; B. Place the powder obtained in step A into a gravity-free mixer heated to 120~140°C and stir. When the material temperature reaches 130°C, pour in anhydrous zinc borate, dispersant and rheology modifier, continue mixing for 5 minutes, discharge and cool to obtain the new flame retardant.

[0032] The method for preparing the conductive fiber includes the following steps: S1. Dissolve polyacrylonitrile in a certain amount of N,N-dimethylformamide to form a polyacrylonitrile solution; S2. Add carbon nanotubes to the polyacrylonitrile solution obtained in step S1 and disperse them ultrasonically to obtain the spinning solution. S3. Electrospin the spinning solution obtained in step S2 to obtain polyacrylonitrile fibers coated with carbon nanotubes. S4. The polyacrylonitrile fiber coated with carbon nanotubes is pre-oxidized and then heated and carbonized in an inert gas atmosphere to obtain the polyacrylonitrile carbon fiber coated with carbon nanotubes.

[0033] The polyacrylonitrile solution contains 15% polyacrylonitrile by mass, and the mass ratio of carbon nanotubes to the polyacrylonitrile solution is 1:10.

[0034] In step S3, the electrospinning voltage is 20 kV and the spinning temperature is room temperature.

[0035] In step S4, the pre-oxidation temperature is 270°C and the pre-oxidation time is 2 h; the carbonization temperature is 1000°C and the carbonization time is 2 h.

[0036] The dispersant is composed of polyethylene wax and calcium stearate in a weight ratio of 1:1.

[0037] The method for preparing the antistatic polycarbonate of the present invention is as follows: take each raw material and perform melt extrusion granulation. Example

[0038] An antistatic and flame-retardant functional polycarbonate comprises the following raw materials in parts by weight: 80 parts of high-chlorinated polyethylene, 15 parts of conductive fiber, 10 parts of flame retardant and 1 part of dispersant.

[0039] The conductive fiber is polyacrylonitrile carbon fiber coated with carbon nanotubes, and the flame retardant is composed of the following components by weight: 75 parts of powdered methyl MQ silicone resin, 10 parts of anhydrous zinc borate, 0.5 parts of dispersant, 0.3 parts of rheology modifier, and 1.2 parts of coupling agent.

[0040] The preparation method of the flame retardant includes the following steps: A. Place the powdered methyl MQ silicone resin into a room temperature zero-gravity mixer, add the coupling agent, and stir for 5 minutes; B. Place the powder obtained in step A into a gravity-free mixer heated to 120~140°C and stir. When the material temperature reaches 130°C, pour in anhydrous zinc borate, dispersant and rheology modifier, continue mixing for 5 minutes, discharge and cool to obtain the new flame retardant.

[0041] The method for preparing the conductive fiber includes the following steps: S1. Dissolve polyacrylonitrile in a certain amount of N,N-dimethylformamide to form a polyacrylonitrile solution; S2. Add carbon nanotubes to the polyacrylonitrile solution obtained in step S1 and disperse them ultrasonically to obtain the spinning solution. S3. Electrospin the spinning solution obtained in step S2 to obtain polyacrylonitrile fibers coated with carbon nanotubes. S4. The polyacrylonitrile fiber coated with carbon nanotubes is pre-oxidized and then heated and carbonized in an inert gas atmosphere to obtain the polyacrylonitrile carbon fiber coated with carbon nanotubes.

[0042] The polyacrylonitrile solution contains 15% polyacrylonitrile by mass, and the mass ratio of carbon nanotubes to the polyacrylonitrile solution is 1:10.

[0043] In step S3, the electrospinning voltage is 20 kV and the spinning temperature is room temperature.

[0044] In step S4, the pre-oxidation temperature is 270°C and the pre-oxidation time is 2 h; the carbonization temperature is 1000°C and the carbonization time is 2 h.

[0045] The dispersant is composed of polyethylene wax and calcium stearate in a weight ratio of 1:1.

[0046] The method for preparing the antistatic polycarbonate of the present invention is as follows: take each raw material and perform melt extrusion granulation. Example

[0047] An antistatic and flame-retardant functional polycarbonate comprises the following raw materials in parts by weight: 70 parts of high-chlorinated polyethylene, 10 parts of conductive fiber, 5 parts of flame retardant and 1 part of dispersant.

[0048] The conductive fiber is polyacrylonitrile carbon fiber coated with carbon nanotubes, and the flame retardant is composed of the following components by weight: 75 parts of powdered methyl MQ silicone resin, 10 parts of anhydrous zinc borate, 0.5 parts of dispersant, 0.3 parts of rheology modifier, and 1.2 parts of coupling agent.

[0049] The preparation method of the flame retardant includes the following steps: A. Place the powdered methyl MQ silicone resin into a room temperature zero-gravity mixer, add the coupling agent, and stir for 5 minutes; B. Place the powder obtained in step A into a gravity-free mixer heated to 120~140°C and stir. When the material temperature reaches 130°C, pour in anhydrous zinc borate, dispersant and rheology modifier, continue mixing for 5 minutes, discharge and cool to obtain the new flame retardant.

[0050] The method for preparing the conductive fiber includes the following steps: S1. Dissolve polyacrylonitrile in a certain amount of N,N-dimethylformamide to form a polyacrylonitrile solution; S2. Add carbon nanotubes to the polyacrylonitrile solution obtained in step S1 and disperse them ultrasonically to obtain the spinning solution. S3. Electrospin the spinning solution obtained in step S2 to obtain polyacrylonitrile fibers coated with carbon nanotubes. S4. The polyacrylonitrile fiber coated with carbon nanotubes is pre-oxidized and then heated and carbonized in an inert gas atmosphere to obtain the polyacrylonitrile carbon fiber coated with carbon nanotubes.

[0051] The polyacrylonitrile solution contains 15% polyacrylonitrile by mass, and the mass ratio of carbon nanotubes to the polyacrylonitrile solution is 1:10.

[0052] In step S3, the electrospinning voltage is 20 kV and the spinning temperature is room temperature.

[0053] In step S4, the pre-oxidation temperature is 270°C and the pre-oxidation time is 2 h; the carbonization temperature is 1000°C and the carbonization time is 2 h.

[0054] The dispersant is composed of polyethylene wax and calcium stearate in a weight ratio of 1:1.

[0055] The method for preparing the antistatic polycarbonate of the present invention is as follows: take each raw material and perform melt extrusion granulation. Example

[0056] An antistatic and flame-retardant functional polycarbonate comprises the following raw materials in parts by weight: 70 parts of high-chlorinated polyethylene, 5 parts of conductive fiber, 3 parts of flame retardant and 1 part of dispersant.

[0057] The conductive fiber is polyacrylonitrile carbon fiber coated with carbon nanotubes, and the flame retardant is composed of the following components by weight: 75 parts of powdered methyl MQ silicone resin, 10 parts of anhydrous zinc borate, 0.5 parts of dispersant, 0.3 parts of rheology modifier, and 1.2 parts of coupling agent.

[0058] The preparation method of the flame retardant includes the following steps: A. Place the powdered methyl MQ silicone resin into a room temperature zero-gravity mixer, add the coupling agent, and stir for 5 minutes; B. Place the powder obtained in step A into a gravity-free mixer heated to 120~140°C and stir. When the material temperature reaches 130°C, pour in anhydrous zinc borate, dispersant and rheology modifier, continue mixing for 5 minutes, discharge and cool to obtain the new flame retardant.

[0059] The method for preparing the conductive fiber includes the following steps: S1. Dissolve polyacrylonitrile in a certain amount of N,N-dimethylformamide to form a polyacrylonitrile solution; S2. Add carbon nanotubes to the polyacrylonitrile solution obtained in step S1 and disperse them ultrasonically to obtain the spinning solution. S3. Electrospin the spinning solution obtained in step S2 to obtain polyacrylonitrile fibers coated with carbon nanotubes. S4. The polyacrylonitrile fiber coated with carbon nanotubes is pre-oxidized and then heated and carbonized in an inert gas atmosphere to obtain the polyacrylonitrile carbon fiber coated with carbon nanotubes.

[0060] The polyacrylonitrile solution contains 15% polyacrylonitrile by mass, and the mass ratio of carbon nanotubes to the polyacrylonitrile solution is 1:10.

[0061] In step S3, the electrospinning voltage is 20 kV and the spinning temperature is room temperature.

[0062] In step S4, the pre-oxidation temperature is 270°C and the pre-oxidation time is 2 h; the carbonization temperature is 1000°C and the carbonization time is 2 h.

[0063] The dispersant is composed of polyethylene wax and calcium stearate in a weight ratio of 1:1.

[0064] The method for preparing the antistatic polycarbonate of the present invention is as follows: take each raw material and perform melt extrusion granulation. Example

[0065] An antistatic and flame-retardant functional polycarbonate comprises the following raw materials in parts by weight: 70 parts of high-chlorinated polyethylene, 5 parts of conductive fiber, 3 parts of flame retardant and 1 part of dispersant.

[0066] The conductive fiber is polyacrylonitrile carbon fiber coated with carbon nanotubes, and the flame retardant is composed of the following components by weight: 75 parts of powdered methyl MQ silicone resin, 10 parts of anhydrous zinc borate, 0.5 parts of dispersant, 0.3 parts of rheology modifier, and 1.2 parts of coupling agent.

[0067] The preparation method of the flame retardant includes the following steps: A. Place the powdered methyl MQ silicone resin into a room temperature zero-gravity mixer, add the coupling agent, and stir for 5 minutes; B. Place the powder obtained in step A into a gravity-free mixer heated to 120~140°C and stir. When the material temperature reaches 130°C, pour in anhydrous zinc borate, dispersant and rheology modifier, continue mixing for 5 minutes, discharge and cool to obtain the new flame retardant.

[0068] The method for preparing the conductive fiber includes the following steps: S1. Dissolve polyacrylonitrile in a certain amount of N,N-dimethylformamide to form a polyacrylonitrile solution; S2. Add carbon nanotubes to the polyacrylonitrile solution obtained in step S1 and disperse them ultrasonically to obtain the spinning solution. S3. Electrospin the spinning solution obtained in step S2 to obtain polyacrylonitrile fibers coated with carbon nanotubes. S4. The polyacrylonitrile fiber coated with carbon nanotubes is pre-oxidized and then heated and carbonized in an inert gas atmosphere to obtain the polyacrylonitrile carbon fiber coated with carbon nanotubes.

[0069] The polyacrylonitrile solution contains 15% polyacrylonitrile by mass, and the mass ratio of carbon nanotubes to the polyacrylonitrile solution is 1:10.

[0070] In step S3, the electrospinning voltage is 20 kV and the spinning temperature is room temperature.

[0071] In step S4, the pre-oxidation temperature is 270°C and the pre-oxidation time is 2 h; the carbonization temperature is 1000°C and the carbonization time is 2 h.

[0072] The dispersant is composed of polyethylene wax and calcium stearate in a weight ratio of 1:1.

[0073] The method for preparing the antistatic polycarbonate of the present invention is as follows: take each raw material and perform melt extrusion granulation.

[0074] Comparative Example 1 Compared with Examples 1-5, the polycarbonate prepared in Comparative Example 1 does not contain conductive fiber raw materials, that is, 80 parts of high chlorinated polyethylene, 5 parts of flame retardant and 2 parts of dispersant are mixed, melt extruded and granulated.

[0075] Comparative Example 2 Compared with Examples 1-5, the polycarbonate prepared in Comparative Example 1 did not contain flame retardants, namely 80 parts of high chlorinated polyethylene, 20 parts of conductive fiber and 1 part of dispersant.

[0076] The polycarbonate products were prepared using the following methods based on the above examples and comparative examples: A. Bisphenol A and a carbonate derivative in corresponding mass fractions are subjected to a polycondensation reaction under polymerization conditions to obtain a polycarbonate product. B. Preparation of novel flame retardants; C. Mechanically mix the corresponding mass proportions of high-chlorinated polyethylene, conductive fiber, novel flame retardant, dispersant and polycarbonate product to obtain the finished product.

[0077] The surface resistivity and flame retardant properties of the polycarbonates prepared in the examples and comparative examples were tested, as shown in the table below:

[0078] As can be seen from the table above, the antistatic polycarbonate of the present invention has a strong antistatic effect. Furthermore, the present invention also conducted UL-94 flame retardancy tests on the polycarbonates of Examples 1-5 and Comparative Examples 1-2. Compared with Comparative Example 2, the test surfaces of Examples 1-5 and Comparative Example 1 all achieved a V0 flame retardancy level, indicating that the antistatic polycarbonate of the present invention also has excellent flame retardant properties.

[0079] To better test the weather resistance properties of polycarbonate, the antistatic polycarbonate and other additives were blended, melt-extruded, and pressed into sheets for testing. Samples prepared in Examples 1-5 and Comparative Examples 1-2 were placed under strong light and high wind conditions, and the cracking time, yellowing degree, and gloss changes were compared. The results are shown in the table below:

[0080] As shown in the table above, the addition of highly chlorinated polyethylene and conductive carbon fiber can synergistically enhance the thermal stability of the polycarbonate, significantly delaying the cracking time, minimizing yellowing, and maintaining good gloss. Through a reasonable ratio of highly chlorinated polyethylene, conductive fiber, flame retardant, and dispersant, a functionally filled polycarbonate with good flame retardant properties and strong thermal stability, while also exhibiting antistatic properties, can be obtained.

[0081] The above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. However, all obvious variations or modifications derived from the spirit of the present invention are within the scope of protection and disclosure of the present invention.

Claims

1. A polycarbonate with high thermal stability and strong anti-aging properties, characterized in that, The raw materials are in the following weight proportions: 30-80 parts of high chlorinated polyethylene, 5-30 parts of conductive fiber, 5-10 parts of novel flame retardant, 1-3 parts of dispersant, 200-240 parts of bisphenol A and 200-240 parts of carbonate derivative.

2. The polycarbonate with high thermal stability and strong anti-aging properties according to claim 1, characterized in that, The conductive fiber is polyacrylonitrile carbon fiber coated with carbon nanotubes. The novel flame retardant is composed of the following components by weight: 70-80 parts of powdered methyl MQ silicone resin, 7.5-16 parts of anhydrous zinc borate, 0.3-0.8 parts of dispersant, 0.16-0.5 parts of rheology modifier, and 1-2 parts of coupling agent.

3. The polycarbonate with high thermal stability and strong anti-aging properties according to claim 2, characterized in that, The preparation method of the novel flame retardant includes the following steps: A. Place the powdered methyl MQ silicone resin into a room temperature zero-gravity mixer, add the coupling agent, and stir for 5 minutes; B. Place the powder obtained in step A into a gravity-free mixer heated to 120~140°C and stir. When the material temperature reaches 130°C, pour in anhydrous zinc borate, dispersant and rheology modifier, continue mixing for 5 minutes, discharge and cool to obtain the new flame retardant.

4. The polycarbonate with high thermal stability and strong anti-aging properties according to claim 1, characterized in that, The method for preparing the conductive fiber includes the following steps: S1. Dissolve polyacrylonitrile in a certain amount of N,N-dimethylformamide to form a polyacrylonitrile solution; S2. Add carbon nanotubes to the polyacrylonitrile solution obtained in step S1 and disperse them by ultrasonication to obtain the spinning solution. S3. Electrospin the spinning solution obtained in step S2 to obtain polyacrylonitrile fibers coated with carbon nanotubes. S4. The polyacrylonitrile fiber coated with carbon nanotubes is pre-oxidized and then heated and carbonized in an inert gas atmosphere to obtain the polyacrylonitrile carbon fiber coated with carbon nanotubes.

5. The polycarbonate with high thermal stability and strong anti-aging properties according to claim 1, characterized in that, The dispersant is composed of polyethylene wax and calcium stearate in a weight ratio of 1 to 3:

1.

6. A method for preparing a polycarbonate with high thermal stability and strong anti-aging properties, using the raw materials described in claim 1, characterized in that, Includes the following steps: A. Bisphenol A and a carbonate derivative in corresponding mass fractions are subjected to a polycondensation reaction under polymerization conditions to obtain a polycarbonate product. B. Preparation of novel flame retardants; C. Mechanically mix the corresponding mass proportions of high-chlorinated polyethylene, conductive fiber, novel flame retardant, dispersant and polycarbonate product to obtain the finished product.

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