High-covering low-gloss polycarbonate composite material for optical lens as well as preparation method and application of high-covering low-gloss polycarbonate composite material

Abstract

The invention relates to the technical field of high polymer materials, in particular to a high-covering low-gloss polycarbonate composite material for an optical lens as well as a preparation method and application of the high-covering low-gloss polycarbonate composite material. The composite material is prepared from the following components in parts by weight: 80 to 99.7 parts of polycarbonate resin, 0.2 to 10 parts of core-shell structure composite particles and 0.1 to 10 parts of carbon black, the core-shell structure composite particle takes cross-linked poly (butyl acrylate) as a core and takes poly (methyl methacrylate-co-styrene) with a microcosmic porous coarse structure as a shell. The preparation method comprises the following steps: synthesizing the core-shell structure composite particles by a three-step emulsion polymerization method, and then mixing the core-shell structure composite particles with polycarbonate resin, carbon black and other auxiliaries at a high speed, performing melt extrusion and granulating. The composite material disclosed by the invention realizes extremely high shading property, low surface glossiness and high impact strength on the basis of maintaining excellent mechanical properties of polycarbonate, and is particularly suitable for preparing structural parts of high-end optical lenses.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of high polymer materials, and particularly relates to a high-hiding low-gloss polycarbonate composite material for optical lenses, a preparation method and application thereof. BACKGROUND

[0002] An optical lens module is mainly composed of optical lenses and structural parts (such as lens barrels, spacers and supports). The structural parts do not participate in imaging, but their functions are crucial: they must completely block and absorb external stray light and internal reflected light to prevent these non-imaging lights from reaching the sensor to form light halos and ghosts, thereby seriously degrading the image quality. Therefore, the material of the lens structural parts must have extremely high light blocking and extremely low gloss.

[0003] Polycarbonate (PC) has become an ideal substrate for manufacturing precision optical structural parts due to its excellent mechanical strength, dimensional stability, heat resistance and cost advantage. However, the existing black polycarbonate material for optical lens structural parts has significant technical defects, mainly in the following aspects: (1) the contradiction between hiding property and processability and mechanical property: in order to achieve absolute light blocking, a high proportion of carbon black must be added. A high amount of carbon black will seriously degrade the rheological properties of the material, resulting in poor melt flowability, making it difficult to fill complex and thin-walled precision structural parts, and causing injection molding internal stress, affecting the dimensional accuracy. At the same time, as inorganic rigid particles, a high amount of carbon black will significantly reduce the impact toughness of the material, resulting in increased brittleness of the parts, which is prone to breakage in a high-vibration environment (such as a vehicle-mounted lens).(2) the drawbacks of low gloss and control means: in order to obtain a low-gloss surface, the traditional technology mainly relies on adding a large amount of inorganic fillers (such as talc, calcium carbonate, glass fiber, etc.) to roughen the surface. This method further aggravates the above-mentioned contradiction: the inorganic fillers, while reducing the gloss, will seriously damage the mechanical properties of the material, causing a sharp decrease in toughness; and are prone to surface appearance defects such as "fiber floating" and "material flowers" during injection molding, resulting in a low yield. In addition, simple physical blending results in uneven dispersion of the fillers and poor performance stability. Although the existing technology CN108368331B discloses that core-shell particles can improve gloss and impact, the effect is very limited.

[0004] Therefore, there is a lack of a polycarbonate composite material that can simultaneously meet the requirements of extreme light blocking, precisely controllable low gloss, and high flow and high toughness in the current market, which has become a key technical bottleneck restricting the performance and reliability of high-end optical lens modules. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a polycarbonate composite material with high hiding, low gloss and high impact strength, as well as a preparation method and application thereof.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention provides a high-coverage, low-gloss polycarbonate composite material for optical lenses, characterized in that the polycarbonate composite material comprises, by weight, the following components: 80-99.7 parts of polycarbonate resin, 0.2-10 parts of core-shell structured composite particles, and 0.1-10 parts of carbon black; wherein the core-shell structured composite particles have cross-linked polybutyl acrylate as the core and poly(methyl methacrylate-copoly-styrene) as the shell.

[0008] In a preferred embodiment, the high-opacity, low-gloss polycarbonate composite material for optical lenses comprises, by weight: 88-98.5 parts polycarbonate resin, 1-6 parts core-shell composite particles, and 0.5-6 parts carbon black.

[0009] In this invention, the core-shell composite particle is the key component. It uses cross-linked polybutyl acrylate elastomer as the core, responsible for absorbing impact energy, and poly(methyl methacrylate-copoly-styrene) with a microporous, rough structure as the shell, responsible for inducing diffuse light reflection to reduce gloss. This core-shell composite particle simultaneously solves the toughening and matting problems in a one-step process, avoiding the compatibility issues caused by compounding multiple additives.

[0010] The core-shell composite particles can be prepared by a method including the following steps:

[0011] (1) Synthesis of elastic core: Butyl acrylate, crosslinking agent and emulsifier are added to water and pre-emulsified by high-speed stirring to form a stable pre-emulsion A; Deionized water and emulsifier are added to a four-necked flask equipped with a stirrer, condenser, thermometer and nitrogen delivery tube, and the temperature is raised under nitrogen protection; Initiator aqueous solution is added, and after the reaction, pre-emulsion A is added dropwise, the temperature is raised to continue the reaction, and the mixture is cooled to room temperature to obtain a milky white polybutyl acrylate elastic latex;

[0012] (2) Coating transition layer: Mix methyl methacrylate and butyl acrylate in proportion, and then add emulsifier to make pre-emulsion B; heat the polybutyl acrylate elastic latex obtained in step (1), then add pre-emulsion B and initiator solution, stir to react, and cool to obtain polybutyl acrylate elastic latex with coating transition layer.

[0013] (3) Constructing a rough outer shell: Mix methyl methacrylate, styrene, pore-forming agent and crosslinking agent, add emulsifier to make pre-emulsion C; heat the polybutyl acrylate elastic latex with the transition layer obtained in step (2), add pre-emulsion C and initiator solution dropwise, and stir to react;

[0014] (4) Post-processing: After the reaction is completed, the reaction emulsion is heated and distilled under reduced pressure to completely remove the pore-forming agent. After cooling, a concentrated hydrochloric acid solution is added dropwise to break the emulsion, filtered, washed with water, and dried under vacuum to obtain white powdery core-shell structured composite particles.

[0015] In a preferred embodiment, the core-shell composite particles may be prepared by a method comprising the following steps:

[0016] (1) Synthesis of elastic core: A certain amount of butyl acrylate, a crosslinking agent accounting for 1-2% of the mass of butyl acrylate, and an emulsifier accounting for 1-6% of the mass of butyl acrylate are added to deionized water and pre-emulsified by high-speed stirring to form a stable pre-emulsion A; in a four-necked flask equipped with a stirrer, condenser, thermometer and nitrogen delivery tube, deionized water and emulsifier are added, and the temperature is raised to 60-90℃ under nitrogen protection; an initiator aqueous solution with a mass concentration of 6% accounting for 2-8% of the mass of pre-emulsion A is added, and the reaction is carried out for 8-15 minutes; pre-emulsion A is added dropwise at a rate of 2-5 ml / min, the temperature is raised to 85℃ and the reaction is continued for 1-2 hours, and the mixture is cooled to room temperature to obtain a milky white polybutyl acrylate elastic latex;

[0017] (2) Coating transition layer: Mix methyl methacrylate and butyl acrylate at a volume ratio of 4-9:1, and then add an emulsifier accounting for 2-6% of the mass of methyl methacrylate to prepare pre-emulsion B; heat the polybutyl acrylate latex obtained in step (1) to 80°C, add pre-emulsion B and initiator solution dropwise at a rate of 2-5 ml / min, stir at a speed of 50-200 rpm, react for 2-3 hours, and cool to obtain polybutyl acrylate elastic latex with a coating transition layer;

[0018] (3) Constructing a rough outer shell: Mix methyl methacrylate, styrene, a porogen accounting for 10-20% of the shell monomer mass and a crosslinking agent accounting for 2-5% of the shell monomer mass, and add an emulsifier accounting for 1-6% of the shell monomer mass to prepare a pre-emulsion C; heat the polybutyl acrylate elastic latex with the transition layer obtained in step (2) to 60-90℃, add the pre-emulsion C and the initiator solution dropwise at a rate of 2-5 ml / min, stir at a speed of 50-200 rpm, and react at 60-90℃ for 2-6 hours;

[0019] (4) Post-processing: After the reaction is completed, the reaction emulsion is heated to 95-110℃ and distilled under reduced pressure for 2-6 hours to completely remove the pore-forming agent. After cooling, 5% hydrochloric acid solution is added dropwise to break the emulsion, filtered, washed with water, and dried under vacuum to obtain white powdery core-shell structured composite particles.

[0020] In one specific embodiment, the crosslinking agent comprises one or more of divinylbenzenes, such as one or more of 1,2-divinylbenzene, 1,3-divinylbenzene and 1,4-divinylbenzene.

[0021] In one specific implementation, the emulsifier includes one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, and sodium hexadecyl sulfate.

[0022] In one specific implementation, the initiator includes one or more of potassium persulfate and sodium persulfate.

[0023] In one specific embodiment, the porogen includes one or more of toluene or hexadecane.

[0024] In this invention, the source of the polycarbonate used is not limited. It can be prepared by conventional processes or purchased directly. The polycarbonate includes polycarbonate prepared by phosgene method and / or melt transesterification method. Preferably, the melt index of the polycarbonate is 0.3-120g / 10min (temperature 300℃ / load 1.2kg).

[0025] In one specific embodiment, the carbon black is selected from one or a mixture of two or more of contact carbon black, furnace black, thermal cracking carbon black and acetylene black, preferably one or a mixture of two or more of furnace black and thermal cracking carbon black.

[0026] On the other hand, the present invention provides a method for preparing the aforementioned polycarbonate composite material. First, core-shell structured composite particles with a specific structure are synthesized via multi-step emulsion polymerization. Then, these particles are melt-blended and extruded with PC, carbon black, etc., to obtain the polycarbonate composite material. Optionally, the melt extrusion temperature is 250-300℃, and the rotation speed is 50-300 rpm.

[0027] Another aspect is the application of the polycarbonate composite material of the present invention in optical lens structural components.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) The polycarbonate composite material of the present invention achieves a perfect balance of high performance: Through innovative material formulation and preparation process, the present invention simultaneously achieves extremely high light-blocking properties and low surface gloss in the polycarbonate matrix, while maintaining the material’s excellent high fluidity and high impact toughness, breaking the contradiction between “high addition amount” and “high performance” in traditional technology.

[0030] (2) The polycarbonate composite material of the present invention improves the reliability of the end product: the optical structural components made of this material can not only ensure excellent light shielding effect to improve imaging quality, but also have excellent mechanical strength to withstand installation stress and vibration and impact in the use environment, which greatly improves the overall reliability and service life of the camera module.

[0031] (3) The polycarbonate composite material of the present invention optimizes the processing technology and yield: the material has good processing fluidity, is easy to form complex precision structures, and the injection molded products have a uniform appearance without defects such as floating fibers and shine, which significantly improves production efficiency and product yield. Detailed Implementation

[0032] The technical solution of the present invention will be further described in detail below with reference to the embodiments. The protection scope of the present invention is not limited to the specific embodiments described below. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0033] The raw materials for the following embodiments are sourced as follows:

[0034] Polycarbonate: can be supplied by Wanhua Chemical Group Co., Ltd., grades 2100, 2220, and 2600, with melt indices of 9, 22, and 60 g / 10 min (temperature 300℃ / load 1.2 kg), respectively.

[0035] MBS toughening agent: The core is cross-linked polybutadiene, and the shell is methyl methacrylate-styrene copolymer, from Kaneka Corporation of Japan, model M732.

[0036] Acrylic toughening agent: Acrylic impact modifier with a core of cross-linked acrylate rubber (PBA) and a shell of polymethyl methacrylate (PMMA), from Kaneka Corporation, Japan, model M-577.

[0037] Silicon-based toughening agent: Mitsubishi Rayon Corporation, model S-2001.

[0038] The performance testing method is as follows:

[0039] Melt flow index was tested according to ISO 1133, under test conditions of 300℃ / 1.2kg;

[0040] Impact strength was tested according to ISO 180 at 23°C.

[0041] Gloss was tested according to ISO 2813, under test conditions of 60°C. o ;

[0042] The transmittance was tested according to ISO 13468, and the sample thickness was 10 μm.

[0043] Preparation Example 1: Preparation of Core-Shell Composite Particles P1

[0044] (1) Synthesis of elastic core: 300 ml of butyl acrylate, 6 g of divinylbenzene and 9 g of sodium dodecyl sulfate were added to 400 ml of deionized water and stirred at 200 rpm for 5 min for pre-emulsification to form a stable pre-emulsion A; 100 ml of deionized water and 6 g of potassium persulfate were added to a four-necked flask equipped with a stirrer, condenser, thermometer and nitrogen delivery tube, and the temperature was raised to 80 °C under nitrogen protection; 3 g of 6% potassium persulfate aqueous solution was added and reacted for 10 min; 300 ml of pre-emulsion A was added dropwise at a rate of 5 ml / min, and after the addition was completed, the temperature was raised to 85 °C and the reaction was continued for 2 hours. After cooling to room temperature, a milky white polybutyl acrylate elastic latex was obtained.

[0045] (2) Coating transition layer: Mix methyl methacrylate and butyl acrylate in a volume ratio of 5:1 for 300 ml, then add 15 g of sodium dodecyl sulfonate to prepare pre-emulsion B; heat the polybutyl acrylate latex obtained in (1) to 80°C, add pre-emulsion B and 6 ml of potassium persulfate solution dropwise at a rate of 5 ml / min, stir at 50 rpm / min, react for 2 hours, and cool to obtain polybutyl acrylate elastic latex containing the transition layer.

[0046] (3) Constructing a rough outer shell: Mix 100 ml of methyl methacrylate, 50 ml of styrene, 20 ml of toluene and 2 g of 1,4-divinylbenzene, and add 1 g of sodium dodecyl sulfate to prepare a pre-emulsion C; heat the polybutyl acrylate elastic latex containing the transition layer obtained in (2) to 90 °C, add the pre-emulsion C and 5 ml of potassium persulfate solution dropwise at a rate of 2 ml / min, stir at 50 rpm, and react at 60 °C for 2 hours.

[0047] (4) Post-treatment: The reaction emulsion was heated to 95°C and distilled under reduced pressure for 6 hours to completely remove the pore-forming agent. After cooling, 5% hydrochloric acid solution was added dropwise to break the emulsion, filtered, washed with water, and dried under vacuum at 80°C for 6 hours to obtain composite particles P1.

[0048] Preparation Example 2: Preparation of Core-Shell Composite Particles P2

[0049] (1) Synthesis of elastic core: 300 ml of butyl acrylate, 3 g of divinylbenzene and 3 g of sodium dodecyl sulfate were added to 400 ml of deionized water and stirred at 200 rpm / min for 5 min for pre-emulsification to form a stable pre-emulsion A; 100 ml of deionized water and 2 g of potassium persulfate were added to a four-necked flask equipped with a stirrer, condenser, thermometer and nitrogen delivery tube, and the temperature was raised to 80 °C under nitrogen protection; 3 g of 6% potassium persulfate aqueous solution was added and reacted for 10 min; 300 ml of pre-emulsion A was added dropwise at a rate of 2 ml / min, and after the addition was completed, the temperature was raised to 85 °C and the reaction was continued for 2 hours. After cooling to room temperature, a milky white polybutyl acrylate elastic latex was obtained.

[0050] (2) Coating transition layer: Mix methyl methacrylate and butyl acrylate in a volume ratio of 5:1 for 300 ml, then add 6 g of sodium dodecyl sulfonate to prepare pre-emulsion B; heat the polybutyl acrylate latex obtained in (1) to 80°C, add pre-emulsion B and 5 ml of potassium persulfate solution dropwise at a rate of 5 ml / min, stir at 50 rpm / min, react for 3 hours, and cool to obtain polybutyl acrylate elastic latex containing the transition layer.

[0051] (3) Constructing a rough outer shell: Mix 100 ml of methyl methacrylate, 50 ml of styrene, 10 ml of toluene and 2 g of 1,4-divinylbenzene, and add 1 g of sodium dodecyl sulfate to prepare a pre-emulsion C; heat the polybutyl acrylate elastic latex containing the transition layer obtained in (2) to 90 °C, add the pre-emulsion C and 5 ml of potassium persulfate solution dropwise at a rate of 2 ml / min, stir at 50 rpm / min, and react at 60 °C for 6 hours.

[0052] (4) Post-treatment: The reaction emulsion was heated to 95°C and distilled under reduced pressure for 6 hours to completely remove the pore-forming agent. After cooling, 5% hydrochloric acid solution was added dropwise to break the emulsion, filtered, washed with water, and dried under vacuum at 80°C for 6 hours to obtain composite particles P2.

[0053] Preparation Example 3: Preparation of core-shell structured composite particles P3 without using a porogen.

[0054] The core-shell composite particle P3 was synthesized according to the method of Example 1 of the present invention, but without adding pore-forming agent (toluene) and divinylbenzene in the third step of constructing the shell.

[0055] Examples 1-2: Preparation of low-gloss, high-opacity polycarbonate materials

[0056] (1) Add polycarbonate, composite particles and carbon black to the mixer according to Table 1 and mix for 30 minutes to obtain mixed raw materials.

[0057] (2) Transfer the mixed raw materials to the twin-screw feed hopper, and keep the feeding speed uniform and smooth to ensure that no blockage occurs during the extrusion process. The temperature of the melting section during the twin-screw extrusion process is 250 / 270 / 275 / 275℃, and the temperature of the mixing section is 265 / 280 / 295℃. After granulation and drying, a low-gloss, high-coverage polycarbonate material is obtained.

[0058] Comparative Examples 1-6

[0059] According to the formulation in Table 1, a toughening agent was used instead of the composite particles in the examples to prepare polycarbonate materials according to the method of Example 1.

[0060] Table 1 Formulations of Examples 1-3 and Comparative Examples 1-6 (wt%)

[0061]

[0062] The properties of the polycarbonate materials prepared in the examples and comparative examples are shown in Table 2.

[0063] Table 2 Performance Comparison of Examples and Comparative Examples

[0064]

[0065] A comparison of Example 1 and Comparative Example 1 revealed that adding the composite particles P1 prepared according to the present invention reduced the surface gloss of the material while maintaining good impact strength. A comparison of Example 2 and Comparative Example 2 revealed that even with very high flowability, the composite particles prepared according to the present invention still maintained good impact strength and very low gloss.

[0066] As can be seen from Comparative Examples 3 and 4, while commercially available conventional core-shell particles can maintain impact strength to some extent, their gloss reduction effect is very poor, falling far short of the low gloss (<50) requirement of this invention. This indicates that existing technologies cannot provide a solution that simultaneously achieves extremely low gloss and ultra-high impact strength.

[0067] This invention creatively constructs a microscopically porous and cross-linked rigid shell by introducing pore-forming agents and cross-linking agents. This design is not a simple component substitution, but a profound modification of the physicochemical properties of the particle surface. Experimental data from Examples 1-2 clearly show that the porous, rough shell is responsible for efficiently scattering light to reduce gloss, while the cross-linked structure ensures that the porous morphology does not melt or fail during high-temperature processing. Compared with the closest prior art (Comparative Examples 3-6), this invention reduces gloss from 95 to 35 while maintaining comparable or even superior impact strength. This significant performance difference and breakthrough is something that those skilled in the art could not have anticipated after reviewing the prior art.

[0068] Examples 4-8 show composite particles prepared using different processes and examples with different addition amounts. Following the extrusion steps of Examples 1-3, the high-coverage, low-gloss polycarbonate composite materials were obtained by melt extrusion granulation after mixing, as shown in Table 3.

[0069] Table 3 Formulation table for Examples 4-8 (wt%)

[0070]

[0071] This invention does not merely select different core-shell compositions, but through a non-obvious structural design, enables the composite particles to produce a synergistic effect in the PC matrix that cannot be achieved by the simple superposition of the components. This results in a breakthrough balance in the contradictory performance indicators of high opacity, low gloss, and high impact resistance, thus possessing outstanding substantive features and significant progress.

[0072] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high-hiding, low-gloss polycarbonate composite material for optical lenses, characterized in that, The polycarbonate composite material comprises the following components in parts by weight: polycarbonate resin 80-99.7 parts, core-shell structure composite particles 0.2-10 parts, and carbon black 0.1-10 parts; wherein the core-shell structure composite particles have a crosslinked polybutyl acrylate as a core and poly(methyl methacrylate-co-styrene) as a shell.

2. The polycarbonate composite of claim 1, wherein, The polycarbonate composite material comprises the following components in parts by weight: polycarbonate resin 88-98.5 parts, core-shell structure composite particles 1-6 parts, and carbon black 0.5-6 parts.

3. The polycarbonate composite according to claim 1 or 2, characterized in that, The core-shell structure composite particles are prepared by a preparation method comprising the following steps: (1) Synthesis of elastic core: butyl acrylate, crosslinking agent and emulsifier are added to water, pre-emulsified at high speed to form stable pre-emulsion A; a four-necked flask equipped with a stirrer, condenser, thermometer and nitrogen inlet is charged with deionized water and emulsifier, and heated under nitrogen protection; an aqueous initiator solution is added, and after reaction, pre-emulsion A is added dropwise, and the reaction is continued at elevated temperature, and then the mixture is cooled to room temperature to obtain a milky white polybutyl acrylate elastic latex; (2) Coating of transition layer: methyl methacrylate and butyl acrylate are mixed in a certain proportion, and then an emulsifier is added to prepare pre-emulsion B; the polybutyl acrylate elastic latex obtained in step (1) is heated, and then pre-emulsion B and an initiator solution are added dropwise, and the mixture is stirred and reacted, and then cooled to obtain polybutyl acrylate elastic latex coated with a transition layer; (3) Construction of rough shell: methyl methacrylate, styrene, porogen and crosslinking agent are mixed, and an emulsifier is added to prepare pre-emulsion C; the polybutyl acrylate elastic latex coated with a transition layer obtained in step (2) is heated, and pre-emulsion C and an initiator solution are added dropwise, and the mixture is stirred and reacted; (4) Post-treatment: after the reaction is completed, the reaction emulsion is heated and distilled under reduced pressure to completely remove the porogen, and then concentrated hydrochloric acid solution is added dropwise after cooling to break the emulsion, filtered, washed with water and vacuum dried to obtain white powdery core-shell structure composite particles.

4. The polycarbonate composite of claim 3, wherein, The core-shell structure composite particles are prepared by a preparation method comprising the following steps: (1) Synthesis of elastic core: a certain amount of butyl acrylate, 1-2% of the mass of butyl acrylate as a crosslinking agent, and 1-6% of the mass of butyl acrylate as an emulsifier are added to deionized water, pre-emulsified at high speed to form stable pre-emulsion A; a four-necked flask equipped with a stirrer, condenser, thermometer and nitrogen inlet is charged with deionized water and emulsifier, and heated under nitrogen protection to 60-90°C; an aqueous initiator solution with a mass concentration of 6% is added at a rate of 2-5 ml / min, and the reaction is continued for 8-15 minutes; pre-emulsion A is added dropwise at a rate of 2-5 ml / min, and the reaction is continued at 85°C for 1-2 hours, and then the mixture is cooled to room temperature to obtain a milky white polybutyl acrylate elastic latex; (2) coating transition layer: mixing methyl methacrylate and butyl acrylate at a volume ratio of 4-9:1, then adding an emulsifier accounting for 2-6% of the mass of methyl methacrylate to form a pre-emulsion B; heating the polybutyl acrylate latex obtained in step (1) to 80℃, adding the pre-emulsion B and initiator solution at a speed of 2-5ml / min, stirring paddle speed 50-200rpm, reacting for 2-3 hours, and cooling to obtain a polybutyl acrylate elastic latex with a coating transition layer; (3) constructing a rough shell: mixing methyl methacrylate, styrene, a porogen accounting for 10-20% of the mass of the shell monomer, and a crosslinking agent accounting for 2-5% of the mass of the shell monomer, adding an emulsifier accounting for 1-6% of the mass of the shell monomer to form a pre-emulsion C; heating the polybutyl acrylate elastic latex with a coating transition layer obtained in step (2) to 60-90℃, adding the pre-emulsion C and initiator solution at a speed of 2-5ml / min, stirring paddle speed 50-200rpm, and reacting at 60-90℃ for 2-6 hours; (4) post-treatment: after the reaction is completed, the reaction emulsion is heated to 95-110℃ and distilled under reduced pressure for 2-6 hours to completely remove the porogen, and after cooling, a 5% volume concentration hydrochloric acid solution is added dropwise to break the emulsion, filtered, washed with water, and vacuum dried to obtain white powder core-shell structure composite particles.

5. The polycarbonate composite according to claim 3 or 4, characterized in that, The crosslinking agent includes one or more of divinylbenzene; and / or The emulsifier includes one or more of sodium dodecyl sulfate, sodium dodecylbenzenesulfonate, and sodium cetyl sulfate; and / or The initiator includes one or more of potassium persulfate and sodium persulfate.

6. The polycarbonate composite of claim 5, wherein, The porogen includes one or more of toluene or hexadecane.

7. The polycarbonate composite of claim 1 or 2, wherein, The polycarbonate resin is polycarbonate prepared by phosgene method or melt transesterification method; Preferably, the melt index of the polycarbonate resin at a temperature of 300℃ and a load of 1.2kg is 0.3-120g / 10min.

8. The polycarbonate composite of claim 1 or 2, wherein, The carbon black is selected from at least one of contact method carbon black, furnace carbon black, thermal cracking carbon black, or acetylene carbon black, preferably one or both of furnace carbon black and thermal cracking carbon black.

9. A process for the production of the polycarbonate composite material according to any one of claims 1 to 8, characterized in that, The step includes mixing the polycarbonate resin, the core-shell structure composite particles, and the carbon black, and melt extruding to obtain. Optionally, the temperature for melt extrusion is 250-300℃, and the rotation speed is 50-300rpm.

10. Use of the polycarbonate composite material of any one of claims 1-8 in an optical lens structure.

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