High-transmittance PC composite material for light-emitting grating and preparation process thereof

Abstract

The application discloses a high-transmittance PC composite material for a light-emitting grid and a preparation process thereof, and relates to the technical field of PC materials.The high-transmittance PC composite material for the light-emitting grid comprises the following raw material components in parts by weight: 90-100 parts of aromatic PC resin; 38-50 parts of a cyclic olefin polymer; 8-12 parts of a compatilizer; 5-12 parts of modified glass powder; and 0.5-1 part of an antioxidant; wherein the compatilizer is prepared by irradiation-induced grafting of the aromatic PC resin and glycidyl methacrylate, and then melt grafting with maleic anhydride grafted polyethylene; the modified glass powder is obtained by modifying glass powder with a phenylsilane coupling agent; and the antioxidant is obtained by mixing and compounding a hindered phenol antioxidant, a phosphite antioxidant and a hindered amine light stabilizer at a mass ratio of (1-2):(1.5-2.5):(1-2).

Description

Technical Field

[0001] This invention relates to the field of PC material technology, specifically to a high-transmittance PC composite material for light-emitting grids and its preparation process. Background Technology

[0002] As automotive design continues to evolve, illuminated grilles, as a crucial component for enhancing vehicle recognizability and a sense of technology, are experiencing increasing market demand. Traditional automotive grilles primarily utilize opaque engineering plastics or metals, focusing mainly on air intake, heat dissipation, and aesthetic decoration. However, driven by the demands of modern automotive intelligent interaction and personalization, illuminated grilles integrating lighting, signal transmission, and aesthetic design have emerged. These illuminated grilles, while maintaining sufficient mechanical strength, also require excellent light transmittance to ensure uniform and efficient light penetration and a clear luminous effect, placing extremely high demands on the optical properties of the materials.

[0003] Polycarbonate (PC) resin is a polymer material with excellent light transmittance, impact resistance, and processability, making it an excellent raw material for automotive luminous grilles. However, PC resin has two major drawbacks: firstly, it is sensitive to moisture and easily absorbs water and degrades; secondly, it is prone to yellowing due to ultraviolet (UV) radiation. Automotive luminous grilles are components that are constantly exposed to UV light and rain. Therefore, if PC resin is directly processed into luminous grilles, the grilles will rapidly absorb water and degrade, and yellow due to UV radiation, causing a sharp decline in their light transmittance. This significantly limits the long-term stability of luminous grilles.

[0004] Based on this, the present invention provides a high-transmittance PC composite material for luminous grids and its preparation process, which is of great significance. Summary of the Invention

[0005] The purpose of this invention is to provide a high-transmittance PC composite material for light-emitting grids and its preparation process, so as to solve the related technical problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A high-transmittance PC composite material for luminous grids comprises the following raw material components in parts by weight: 90-100 parts of aromatic PC resin; 38-50 parts of cyclic olefin polymer; 8-12 parts compatibilizer; 5-12 parts of modified glass powder; Anti-aging agent 0.5~1 part.

[0007] Preferably, the compatibilizer is prepared by: (1) adding aromatic PC resin and dichloromethane to a reaction vessel under nitrogen protection, stirring to dissolve, then adding glycidyl methacrylate, stirring and mixing for 30-60 minutes to obtain the reaction solution; (2) using... 60 Co's γ rays were used to irradiate the reaction liquid in the reactor at an irradiation dose of 25~35kGy and an irradiation dose rate of 1~3kGy / h. During the irradiation treatment, the temperature inside the reactor was controlled to be ≤35℃. After the irradiation treatment was completed, sufficient n-hexane was added to the reactor, and the mixture was allowed to stand and precipitate. After filtration, washing, and vacuum drying, epoxy-grafted PC resin was obtained. (3) Epoxy-grafted PC resin, maleic anhydride-grafted polyethylene, and antioxidant were added to a mixer and melt-mixed at 240~255℃ for 3~6 minutes. After extrusion granulation, compatibilizer was obtained.

[0008] More preferably, the mass ratio of the aromatic PC resin, glycidyl methacrylate, and dichloromethane is (1.5~2.5):(0.2~0.4):(10~18).

[0009] More preferably, the mass ratio of epoxy-grafted PC resin, maleic anhydride-grafted polyethylene, and antioxidant is (1~2):(0.1~0.2):(0.02~0.04).

[0010] More preferably, the modified glass powder is prepared by: (1) adding phenylsilane coupling agent and 80-90wt% ethanol aqueous solution into a reaction vessel, and adding acetic acid to adjust the pH to 4.5-5.5, stirring and mixing at 40-50℃ for 30-60min to obtain phenylsilane hydrolysate; (2) adding glass powder and phenylsilane hydrolysate into a mixer, stirring and mixing at 40-50℃ at a stirring speed of 30-50rpm for 1-2h, and then separating, washing, and drying to obtain modified glass powder.

[0011] More preferably, the volume ratio of the phenylsilane coupling agent to the aqueous ethanol solution is (0.06~0.1):1.

[0012] More preferably, the ratio of glass powder to phenylsilane hydrolysate is 10g:(3~4)mL.

[0013] More preferably, the glass powder has a particle size of 5~15μm.

[0014] Preferably, the refractive index of the glass powder is 1.6~1.65; the refractive index of the aromatic PC resin is approximately 1.58. Using glass powder with a similar refractive index as a filler can enhance the performance of the aromatic PC resin while minimizing its impact on light transmittance. Furthermore, considering that direct introduction of glass powder would inevitably result in poor dispersion and compatibility within the aromatic PC resin, surface modification is necessary. Using a silane coupling agent for surface modification can coat the glass powder to some extent, leading to a decrease in its refractive index. Therefore, the glass powder used in this invention has a refractive index greater than 1.58, preferably 1.6~1.65. After modification, its refractive index is closer to that of the aromatic PC resin.

[0015] More preferably, the antioxidant is obtained by mixing and compounding hindered phenolic antioxidants, phosphite antioxidants and hindered amine light stabilizers in a mass ratio of (1~2):(1.5~2.5):(1~2).

[0016] More preferably, the hindered amine light stabilizer is a non-alkaline hindered amine light stabilizer; the reason is that alkaline hindered amine light stabilizers and hindered phenolic antioxidants will react chemically, causing the hindered phenolic antioxidants to be oxidized by nitric oxide free radicals, thereby leading to a significant failure of the antioxidant.

[0017] A second aspect of this invention provides a process for preparing a high-transmittance PC composite material for a light-emitting grid, comprising the following steps: S1: Add aromatic PC resin, cyclic olefin polymer, compatibilizer, modified glass powder, and antioxidant into a mixer according to the formula ratio, and mix at a mixing speed of 100~200rpm for 20~60min to obtain a mixture. S2: Add the mixture into a twin-screw extruder and melt-extrude and granulate it at 250~265℃ and a screw speed of 150~250rpm to obtain a high-transmittance PC composite material for luminous grids.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention incorporates cyclic olefin polymers to enhance the light transmittance of aromatic PC resins. Simultaneously, the cyclic olefin polymers can reduce the water absorption rate of aromatic PC resins and further ensure long-term light transmittance. However, considering the limited compatibility between aromatic PC resins and cyclic olefin polymers, the addition of cyclic olefin polymers may lead to performance degradation of aromatic PC resins if the compatibility issue is not addressed. Therefore, this invention employs an irradiation-induced method to graft glycidyl methacrylate onto polycarbonate, controlling the temperature to ≤35℃ during the process to prevent self-polymerization of glycidyl methacrylate and ensure grafting efficiency. Then, through melt grafting, maleic anhydride-grafted polyethylene and epoxy-grafted PC resin are grafted and bonded to obtain a compatibilizer containing PC and polyethylene segments. This compatibilizer significantly improves the interfacial compatibility between aromatic PC resins and cyclic olefin polymers, enhancing the light transmittance of PC composites and reducing their water absorption rate.

[0019] 2. Aromatic PC resin molecules contain numerous benzene ring structures. Modified glass powder is obtained by grafting benzene ring structures onto its surface using a phenylsilane coupling agent. The benzene ring structures on the modified glass powder and those on the aromatic PC resin molecular chain can form π-π stacking interactions, which can enhance the interfacial compatibility between the glass powder and the aromatic PC resin to a certain extent. After modification, the dispersibility of the glass powder in the aromatic PC resin is significantly improved. This not only significantly improves the mechanical, aging resistance, water absorption, and processing properties of the aromatic PC resin, but also minimizes the impact of filler incorporation on the light transmittance of the aromatic PC resin. However, excessive filler incorporation is not advisable, as it can severely affect the light transmittance of the PC composite material.

[0020] 3. This invention employs a mixture of hindered phenolic antioxidants, phosphite antioxidants, and hindered amine light stabilizers as an anti-aging agent. The hindered phenolic antioxidants provide active hydrogen, capturing free radicals generated by the breakage of PC molecular chains due to high temperature and moisture absorption, thus interrupting the process of PC molecular chain breakage. Simultaneously, with the assistance of phosphite antioxidants, it effectively slows down the rate of damp heat aging of the PC composite material. The hindered amine light stabilizers capture free radicals generated by photodegradation of the PC composite material, thereby cutting off the process of photo-oxidative degradation and effectively slowing down the rate of UV aging of the PC composite material. Through the synergistic effect of the hindered phenolic antioxidants, phosphite antioxidants, and hindered amine light stabilizers, the resistance to damp heat aging and photoaging of the PC composite material is guaranteed, effectively preventing yellowing due to aging and subsequent decrease in light transmittance, enabling the PC composite material to maintain stable high light transmittance performance over a long period. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the following embodiments, the relevant raw materials are: Aromatic PC resin, grade UF-1017B; Cyclic olefin polymer, grade 690R; Maleic anhydride-grafted polyethylene has a grafting rate of 1-1.3% and an average molecular weight of 10,000. Glass powder with a particle size of 10μm and a refractive index of 1.63 and 1.5; Hindered phenolic antioxidant, model number Antioxidant 1076; Phosphite antioxidant, model number Antioxidant 168; Non-alkaline hindered amine light stabilizer, model number Tinuvin® 249; Basic hindered amine light stabilizer, model RIASORB® UV-622; All ingredients are commercially available; each serving is 100g.

[0023] Example 1: A preparation process of a high-transmittance PC composite material for light-emitting grids: 1. Preparation of compatibilizer: (1) Under nitrogen protection, aromatic PC resin and dichloromethane were added to the reactor and stirred to dissolve. Then, glycidyl methacrylate was added and stirred for 45 min to obtain the reaction solution. The mass ratio of aromatic PC resin, glycidyl methacrylate and dichloromethane was 2:0.3:15. (2) The reaction solution in the reactor was irradiated with 60Co γ rays at an irradiation dose of 30 kGy and an irradiation dose rate of 2 kGy / h. During the irradiation, the reaction solution was controlled. The temperature inside the reactor is ≤35℃. After the irradiation treatment is completed, add sufficient n-hexane to the reactor, let it stand to precipitate, filter, wash, and vacuum dry to obtain epoxy-grafted PC resin; (3) Add epoxy-grafted PC resin, maleic anhydride-grafted polyethylene, and antioxidant 1076 into a mixer, melt mix at 250℃ for 5 minutes, and granulate by extrusion to obtain a compatibilizer. The mass ratio of epoxy-grafted PC resin, maleic anhydride-grafted polyethylene, and antioxidant 1076 is 1.5:0.15:0.03. 2. Preparation of modified glass powder: (1) Add phenyltriethoxysilane and 85wt% ethanol aqueous solution to the reaction vessel, and add acetic acid to adjust the pH to 5. Stir and mix at 45℃ for 45min to obtain phenylsilane hydrolysate. The volume ratio of phenyltriethoxysilane to ethanol aqueous solution is 0.08:1. (2) Add glass powder with a particle size of 10μm and a refractive index of 1.63 and phenylsilane hydrolysate to the stirrer. Stir and mix at 45℃ for 1.5h at a stirring speed of 40rpm. After separation, washing and drying, modified glass powder is obtained. The ratio of glass powder to phenylsilane hydrolysate is 10g:4mL. 3. Formulating antioxidants: Combine antioxidant 1076, antioxidant 168, and Tinuvin. ® 249 light stabilizers were mixed and compounded in a mass ratio of 1.5:2:1.5 to obtain an antioxidant; 4. Preparation of high-transmittance PC composite material for light-emitting grids: S1: Add 95 parts of aromatic PC resin, 44 parts of cyclic olefin polymer, 10 parts of compatibilizer, 8.5 parts of modified glass powder, and 0.75 parts of antioxidant into a mixer and mix at a stirring speed of 150 rpm for 40 minutes to obtain a mixture. S2: The mixture is added into a twin-screw extruder and melt-extruded and granulated at 255°C and a screw speed of 200 rpm to obtain a high-transmittance PC composite material for luminous grids.

[0024] Example 2: Example 2 is based on Example 1, but with adjustments made to the following: the amount of raw material components in the high-transmittance PC composite material used for the light-emitting grid; other processes remain unchanged, specifically: 4. Preparation of high-transmittance PC composite material for light-emitting grids: S1: Add 95 parts of aromatic PC resin, 38 parts of cyclic olefin polymer, 8 parts of compatibilizer, 5 parts of modified glass powder, and 0.75 parts of antioxidant into a mixer and mix at a speed of 150 rpm for 40 minutes to obtain a mixture. S2: The mixture is added into a twin-screw extruder and melt-extruded and granulated at 255°C and a screw speed of 200 rpm to obtain a high-transmittance PC composite material for luminous grids.

[0025] Example 3: Example 3 is based on Example 1, but with adjustments made to the following: the amount of raw material components in the high-transmittance PC composite material used for the light-emitting grid; other processes remain unchanged, specifically: 4. Preparation of high-transmittance PC composite material for light-emitting grids: S1: Add 95 parts of aromatic PC resin, 50 parts of cyclic olefin polymer, 12 parts of compatibilizer, 12 parts of modified glass powder, and 0.75 parts of antioxidant into a mixer and mix at a speed of 150 rpm for 40 minutes to obtain a mixture. S2: The mixture is added into a twin-screw extruder and melt-extruded and granulated at 255°C and a screw speed of 200 rpm to obtain a high-transmittance PC composite material for luminous grids.

[0026] The following is a control experiment based on Example 1, with comparative examples 1 to 8, as detailed below: Comparative Example 1: Comparative Example 1 is based on Example 1, with the following adjustment: the amount of compatibilizer was reduced, while other processes remained unchanged. Specifically: 4. Preparation of high-transmittance PC composite material for light-emitting grids: S1: Add 95 parts of aromatic PC resin, 44 parts of cyclic olefin polymer, 1 part of compatibilizer, 8.5 parts of modified glass powder, and 0.75 parts of antioxidant into a mixer and mix at a stirring speed of 150 rpm for 40 minutes to obtain a mixture. S2: The mixture is added into a twin-screw extruder and melt-extruded and granulated at 255°C and a screw speed of 200 rpm to obtain a high-transmittance PC composite material for luminous grids.

[0027] Comparative Example 2: Comparative Example 2 is based on Example 1, with the following adjustment: the amount of compatibilizer is increased, while other processes remain unchanged. Specifically: 4. Preparation of high-transmittance PC composite material for light-emitting grids: S1: Add 95 parts of aromatic PC resin, 44 parts of cyclic olefin polymer, 15 parts of compatibilizer, 8.5 parts of modified glass powder, and 0.75 parts of antioxidant into a mixer and mix at 150 rpm for 40 minutes to obtain a mixture. S2: The mixture is added into a twin-screw extruder and melt-extruded and granulated at 255°C and a screw speed of 200 rpm to obtain a high-transmittance PC composite material for luminous grids.

[0028] Comparative Example 3: Comparative Example 3 is based on Example 1, with the following adjustment: the amount of modified glass powder was reduced, while other processes remained unchanged. Specifically: 4. Preparation of high-transmittance PC composite material for light-emitting grids: S1: Add 95 parts of aromatic PC resin, 44 parts of cyclic olefin polymer, 10 parts of compatibilizer, 1 part of modified glass powder, and 0.75 parts of antioxidant into a mixer and mix at a speed of 150 rpm for 40 minutes to obtain a mixture. S2: The mixture is added into a twin-screw extruder and melt-extruded and granulated at 255°C and a screw speed of 200 rpm to obtain a high-transmittance PC composite material for luminous grids.

[0029] Comparative Example 4: Comparative Example 4 is based on Example 1, with the following adjustment: the amount of modified glass powder is increased, while other processes remain unchanged. Specifically: 4. Preparation of high-transmittance PC composite material for light-emitting grids: S1: Add 95 parts of aromatic PC resin, 44 parts of cyclic olefin polymer, 10 parts of compatibilizer, 15 parts of modified glass powder, and 0.75 parts of antioxidant into a mixer and mix at a speed of 150 rpm for 40 minutes to obtain a mixture. S2: The mixture is added into a twin-screw extruder and melt-extruded and granulated at 255°C and a screw speed of 200 rpm to obtain a high-transmittance PC composite material for luminous grids.

[0030] Comparative Example 5: Comparative Example 5 is based on Example 1, with the following adjustment: the refractive index of the glass powder used is 1.5, while other processes remain unchanged. Specifically: 2. Preparation of modified glass powder: (1) Add phenyltriethoxysilane and 85wt% ethanol aqueous solution to the reaction vessel, and add acetic acid to adjust the pH to 5. Stir and mix at 45℃ for 45min to obtain phenylsilane hydrolysate. The volume ratio of phenyltriethoxysilane to ethanol aqueous solution is 0.08:1. (2) Add glass powder with a particle size of 10μm and a refractive index of 1.5 and phenylsilane hydrolysate to the stirrer. Stir and mix at 45℃ and 40rpm for 1.5h. After separation, washing and drying, modified glass powder is obtained. The ratio of glass powder to phenylsilane hydrolysate is 10g:4mL.

[0031] Comparative Example 6: Comparative Example 6 is based on Example 1, with the following adjustments: the glass powder is not modified, while other processes remain unchanged. Specifically: 4. Preparation of high-transmittance PC composite material for light-emitting grids: S1: Add 95 parts of aromatic PC resin, 44 parts of cyclic olefin polymer, 10 parts of compatibilizer, 8.5 parts of glass powder, and 0.75 parts of antioxidant into a mixer and mix at 150 rpm for 40 minutes to obtain a mixture. S2: The mixture is added into a twin-screw extruder and melt-extruded and granulated at 255°C and a screw speed of 200 rpm to obtain a high-transmittance PC composite material for luminous grids.

[0032] Comparative Example 7: Comparative Example 7 is based on Example 1, with the following adjustments: the hindered amine light stabilizer used is a basic hindered amine light stabilizer, while other processes remain unchanged. Specifically: 3. Preparation of antioxidant: Antioxidant 1076, antioxidant 168 and RIASORB® UV-622 light stabilizer are mixed and compounded in a mass ratio of 1.5:2:1.5 to obtain antioxidant.

[0033] Comparative Example 8: Comparative Example 8 is based on Example 1, with the following adjustment: only aromatic PC resin is used, while other processes remain unchanged. Specifically: 1. Preparation of high-transmittance PC composite material for luminous grid: Aromatic PC resin is added into a twin-screw extruder and melt-extruded and granulated at 255°C and a screw speed of 200 rpm to obtain high-transmittance PC composite material for luminous grid.

[0034] Performance testing: The luminescent grids prepared in Examples 1-3 and Comparative Examples 1-8 were heated to 255°C using high-transmittance PC composite material and then stretched to obtain PC films with a thickness of 1 mm. Light transmittance, water absorption, and aging resistance tests were conducted on each group of PC films. The specific test methods are as follows: 1. Light transmittance test: Based on GB / T 2410-2008, the PC film was cut into 50mm×50mm square samples; the light transmittance test was conducted using an integrating sphere haze meter in an environment of 23℃ and 50%RH. 2. Water absorption test: Using GB / T 1034-2008 as the reference standard, the PC film was cut into 60mm×60mm square samples. The samples were first dried at 50℃ for 24 hours. After returning to room temperature, the weight was recorded as m1. Then, the samples were immersed in distilled water at 23℃ for 48 hours. After soaking, the surface moisture of the PC film was quickly wiped dry and the weight was recorded as m2. Finally, the water absorption rate was calculated by (m2-m1) / m1×100%. 3. Aging resistance test: Based on GB / T 16422.3-2022 as the reference standard, a UVA-340 (Type 1A) lamp was used, with a 0.76W / (m²) saturation level. 2 The light intensity of the sample was simulated to simulate natural light, and an artificial accelerated climate aging test was conducted. The exposure cycle aging test was carried out by first placing a 50mm×50mm square sample under UV treatment at 60℃ for 8 hours, then turning off the UVA-340 lamp, then treating it with condensation at 50℃ for 4 hours, and then continuing to treat it under UV treatment at 60℃ for 8 hours... After 960 hours of cycling, the light transmittance test was conducted.

[0035] The specific test results are shown in Table 1 below: Table 1: Test results of light transmittance, water absorption, and aging resistance of Examples 1-3 and Comparative Examples 1-8

[0036] Results Analysis: Comparing the test results of the examples and comparative examples in Table 1 above, we can conclude that: In Comparative Example 1, the reduced amount of compatibilizer resulted in poor interfacial compatibility between the cyclic olefin polymer and the aromatic PC resin, which in turn led to a decrease in the light transmittance of the PC resin. In Comparative Example 2, the performance of the PC composite material decreased instead of increasing due to the increased amount of compatibilizer. The reason for this is that the excessive amount of compatibilizer caused the formation of trace agglomerates in the PC composite material, which in turn reduced the modification effect. In Comparative Example 3, due to the reduction in the amount of modified glass powder, the light transmittance of the natural PC composite material was improved, but both its water absorption and aging resistance were reduced. In Comparative Example 4, due to the increased amount of modified glass powder, although the water absorption and aging resistance of the PC composite material were improved, the light transmittance of the PC composite material was significantly reduced. In Comparative Example 5, glass powder with a refractive index that differs significantly from that of aromatic PC resin was used as a filler to modify the aromatic PC resin. Although there were no significant changes in water absorption and aging resistance, the light transmittance of the PC composite material was significantly reduced. In Comparative Example 6, the glass powder was not modified, resulting in poor dispersion in the PC composite material, which naturally led to the degradation of the PC composite material's performance. In Comparative Example 7, because a non-alkaline hindered amine light stabilizer was not used, the hindered phenolic antioxidant and the hindered phenolic light stabilizer reacted, causing the anti-aging agent to fail. This not only affected the original light transmittance of the PC composite material, but also caused a significant decrease in the aging resistance of the PC composite material.

[0037] In summary, this invention uses cyclic olefin polymers, compatibilizers, modified glass powders, and antioxidants to modify aromatic PC resins. Under the synergistic effect of these four agents, the light transmittance, water absorption, and aging resistance of the aromatic PC resins are significantly enhanced, enabling the prepared PC composite materials to maintain high light transmittance stably for a long period of time, which is of great significance.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A high-transmittance PC composite material for luminous grids, characterized in that: The raw material components include the following parts by weight: 90-100 parts of aromatic PC resin; 38-50 parts of cyclic olefin polymer; 8-12 parts compatibilizer; 5-12 parts of modified glass powder; Anti-aging agent 0.5~1 part; The grade of the cyclic olefin polymer is 690R; The compatibilizer is prepared by irradiation-induced grafting of aromatic PC resin and glycidyl methacrylate, followed by melt grafting with maleic anhydride-grafted polyethylene. The modified glass powder is obtained by modifying glass powder with a phenylsilane coupling agent; The glass powder has a particle size of 5~15μm; the refractive index of the glass powder is 1.6~1.65; The anti-aging agent is obtained by mixing and compounding hindered phenolic antioxidants, phosphite antioxidants and hindered amine light stabilizers in a mass ratio of (1~2):(1.5~2.5):(1~2); The hindered amine light stabilizer is a non-basic hindered amine light stabilizer.

2. The high-transmittance PC composite material for a light-emitting grid according to claim 1, characterized in that: The preparation method of the compatilizer is: (1) under nitrogen protection, stirring and mixing aromatic PC resin, glycidyl methacrylate, dichloromethane to obtain a reaction liquid; (2) using 60 The reaction liquid in the reaction kettle is irradiated by Co gamma rays at an irradiation dose of 25-35 kGy and an irradiation dose rate of 1-3 kGy / h, during which the temperature in the reaction kettle is controlled to be ≤35℃; after the irradiation treatment is completed, sufficient n-hexane is added into the reaction kettle, and then the mixture is allowed to stand and precipitate, filtered, washed, and vacuum dried to obtain an epoxy-grafted PC resin; (3) the epoxy-grafted PC resin, maleic anhydride grafted polyethylene, and antioxidant are added into an internal mixer, and then melt-mixed at 240-255℃ for 3-6 min, and then extruded and granulated to obtain the compatilizer.

3. The high-transmittance PC composite material for a light-emitting grid according to claim 2, characterized in that: The mass ratio of the aromatic PC resin, glycidyl methacrylate, and dichloromethane is (1.5~2.5):(0.2~0.4):(10~18); the mass ratio of the epoxy-grafted PC resin, maleic anhydride-grafted polyethylene, and antioxidant is (1~2):(0.1~0.2):(0.02~0.04).

4. The high-transmittance PC composite material for a light-emitting grid according to claim 3, characterized in that: The modified glass powder is prepared by: (1) adding phenylsilane coupling agent and ethanol aqueous solution into the reaction vessel, and adding acetic acid to adjust the pH to 4.5~5.5, stirring and mixing to obtain phenylsilane hydrolysate; (2) adding glass powder and phenylsilane hydrolysate into a mixer, stirring and mixing, separating, washing and drying to obtain modified glass powder.

5. The high-transmittance PC composite material for a light-emitting grid according to claim 4, characterized in that: The volume ratio of the phenylsilane coupling agent to the ethanol aqueous solution is (0.06~0.1):1; the ratio of the glass powder to the phenylsilane hydrolysate is 10g:(3~4)mL.

6. A preparation process for a high-transmittance PC composite material for a light-emitting grid according to any one of claims 1 to 5, characterized in that: Includes the following steps: S1: Add aromatic PC resin, cyclic olefin polymer, compatibilizer, modified glass powder, and antioxidant to a mixer according to the formula ratio, and mix to obtain a mixture. S2: Add the mixture into a twin-screw extruder and melt-extrude and granulate it at 250~265℃ and a screw speed of 150~250rpm to obtain a high-transmittance PC composite material for luminous grids.

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