PC (Polycarbonate) light diffusion master batch as well as preparation method and application thereof

Abstract

The invention belongs to the field of plastic product processing, and particularly relates to a PC light diffusion master batch and a preparation method and application thereof. The PC light diffusion master batch comprises 60-80 parts by weight of waste PC plastic, 5-20 parts by weight of a light diffusion agent, 2-8 parts by weight of a compatibilizer, 1-5 parts by weight of a chain extender, 0.5-3 parts by weight of an antioxidant, 0.5-2 parts by weight of an anti-ultraviolet agent and 0.5-2 parts by weight of a heat stabilizer, wherein the sum of the parts by weight of the components is 100. According to the invention, the waste PC plastic is cleaned, crushed and melted, and then is blended with the functional additive for extrusion granulation, so that the problems of high cost of pure PC raw materials and waste of waste plastic resources in the prior art are solved. The master batch provided by the invention has optical properties and mechanical properties equivalent to those of a brand new PC raw material, can further reduce the production cost, can be applied to the fields of LED illumination, automobile lampshades, electronic display and the like, and has both environmental protection property and economical efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of plastic product processing, and in particular relates to a PC light diffusion masterbatch and a preparation method and application thereof. Background Art

[0002] Existing PC light-diffusing masterbatches mostly use virgin polycarbonate (PC) as raw material. However, virgin PC costs 30,000 to 50,000 yuan per ton, resulting in high production costs for plastic products made from it. Compared to virgin PC, recycled scrap PC fetches only 8,000 to 15,000 yuan per ton, making its cost of use far lower than virgin PC. However, repeated processing of scrap PC can lead to molecular chain degradation, significantly reducing mechanical properties (such as impact strength) and optical properties (light transmittance and haze), making it difficult to directly use in high-value-added products.

[0003] Although the existing physical recycling process of waste PC can reduce costs, the recycled PC has poor compatibility and many residual impurities, and still cannot meet the high optical performance requirements of light diffusion masterbatch.

[0004] Based on this, the art urgently needs a PC light diffusion masterbatch with low production cost and good mechanical and optical properties. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a PC light-diffusing masterbatch, a preparation method and application thereof. By using waste PC as raw material and processing it with a variety of additives, a light-diffusing PC masterbatch is obtained, which can then be injection molded to produce plastic products whose optical and mechanical properties meet the requirements of use.

[0006] To achieve the first purpose, the present invention adopts the following technical solutions: A PC light diffusion masterbatch, comprising the following components in parts by weight: Waste PC plastic: 60~80 parts; Light diffuser: 5~20 parts; Compatibilizer: 2~8 parts; Chain extender: 1~5 parts; Antioxidant: 0.5~3 parts; Anti-ultraviolet agent: 0.5~2 parts; Heat stabilizer: 0.5~2 parts; The total weight of each component is 100 parts.

[0007] Optionally, the waste PC plastic is purified PC waste plastic obtained after washing, crushing, melting and filtering.

[0008] Optionally, the waste PC plastic is selected from one or more of discarded optical discs, discarded automobile lampshades, and discarded electronic product casings obtained from PC as raw materials.

[0009] Optionally, the light diffuser is silicon dioxide and / or barium sulfate; Optionally, the particle size of the light diffuser is 1 to 5 μm; Optionally, the surface of the light diffuser is modified by a silane coupling agent.

[0010] Optionally, the compatibilizer is maleic anhydride grafted polypropylene; Optionally, the weight average molecular weight of the maleic anhydride grafted polypropylene is 20,000 to 60,000; Optionally, the grafting rate of maleic anhydride grafted polypropylene is 0.8-1.5%.

[0011] Optionally, the chain extender is bisphenol A epoxy resin.

[0012] Optionally, the antioxidant is tris(2,4-di-tert-butylphenyl)phosphite.

[0013] Optionally, the anti-ultraviolet agent is 2-(2H-benzotriazole-2-yl)-4,6-di-tert-amylphenol.

[0014] 8. Optionally, the heat stabilizer is calcium stearate and / or zinc stearate.

[0015] A second object of the present invention is to provide a method for preparing a PC light diffusion masterbatch, which specifically comprises the following steps: The waste PC plastic is sequentially washed, crushed, melted and filtered to obtain purified waste PC plastic; Purified waste PC plastics are mixed with a chain extender, a compatibilizer, an antioxidant, an anti-ultraviolet agent, and a heat stabilizer in proportion to obtain a premix; The premix and the light diffuser are mixed and then put into a twin-screw extruder for extrusion and granulation to obtain PC light diffusion masterbatch.

[0016] The third object of the present invention is to provide an application of PC light-diffusing masterbatch. Specifically, the PC light-diffusing masterbatch is used to prepare one or more of LED lampshades, automotive interior lampshades, and light guide plates for electronic displays through injection molding.

[0017] Optionally, the injection molding temperature is 260-300° C., and the pressure is 60-100 MPa.

[0018] Beneficial effects of the present invention: (1) The PC light diffusion masterbatch provided by the present invention uses waste PC as raw material instead of new PC, which can effectively reduce production costs.

[0019] (2) The present invention adds a chain extender to the light-diffusing PC masterbatch to repair the molecular chain and adds a compatibilizer to improve the interface bonding, thereby effectively improving the transmittance, haze and impact strength of the PC light-diffusing masterbatch injection-molded products to be equivalent to the performance of the new PC masterbatch.

[0020] (3) The PC light diffusion masterbatch provided by the present invention realizes the high-value recycling of waste PC and reduces plastic pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention provides a flow chart of the method for preparing PC light diffusion masterbatch. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] As used herein, the terms "comprises," "including," "having," "containing" or any other variations thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a listed element is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0024] "Optional" or "either" means that the subsequently described event or circumstance can or cannot occur, and that the description includes instances where the event occurs and instances where it does not.

[0025] The indefinite articles "a" and "an" before the elements or components of the present invention do not limit the quantity requirement (i.e., the number of times the elements or components appear). Therefore, "a" or "an" should be interpreted as including one or at least one, and the singular form of the element or component also includes the plural form, unless the number is obvious that only the singular form is required.

[0026] The terms "one embodiment," "some embodiments," "exemplarily," "specific examples," or "some examples" used in the present invention mean that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this document, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example.

[0027] The numerical range of the present invention includes not only the point values ​​listed in the embodiments, but also any point values ​​not listed between the numerical ranges of the present invention. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range.

[0028] In the following examples, unless otherwise specified, all reagents and consumables were purchased from conventional reagent manufacturers in the field.

[0029] The present invention will be further described below by means of specific embodiments: This embodiment provides a PC light diffusion masterbatch, which includes the following components in parts by weight: Waste PC plastic: 60~80 parts; Light diffuser: 5~20 parts; Compatibilizer: 2~8 parts; Chain extender: 1~5 parts; Antioxidant: 0.5~3 parts; Anti-ultraviolet agent: 0.5~2 parts; Heat stabilizer: 0.5~2 parts; The total weight of each component is 100 parts.

[0030] In some specific embodiments, the PC waste plastic is purified PC waste plastic obtained through cleaning, crushing, melting, and filtering. Waste PC often contains impurities (such as residual pigments and fillers), which can affect the dispersibility of the light diffuser. Therefore, the PC waste plastic used in this embodiment requires pretreatment before processing to maximize the performance of the PC light diffuser masterbatch.

[0031] In some specific embodiments, the weight percentage of the waste PC plastic can be 60, 65, 70, 75, or 80, as long as the weight percentage of the waste PC plastic is within the range.

[0032] In some specific embodiments, the waste PC plastic is selected from one or more of discarded optical discs, discarded automobile lampshades, and discarded electronic product housings obtained from PC as raw materials.

[0033] In some specific embodiments, the weight percentage of the light diffuser can be 5 parts, 10 parts, 15 parts, or 20 parts, as long as the weight percentage of the light diffuser is within the range.

[0034] In some specific embodiments, the light diffusing agent is silicon dioxide and / or barium sulfate.

[0035] In some specific embodiments, the particle size of the light diffusing agent is 1-5 μm.

[0036] As an example, the particle size of the light diffuser may be 1 μm, 2 μm, 3 μm, 4 μm, or 5 μm.

[0037] In some specific embodiments, when the light diffuser particle size is 1-3 μm, light loss can be reduced and moderate haze can be achieved, resulting in a uniform dispersion of the light in the resulting plastic product, achieving soft and uniform light. In some specific embodiments, when the light diffuser particle size is greater than 3 μm and less than 5 μm, the large particle size light diffuser can achieve multiple enhanced reflections, resulting in better light shielding effects. However, this may result in a slight decrease in the light transmittance of the resulting plastic product, increasing light loss.

[0038] In some specific embodiments, the surface of the light diffuser may be modified by a silane coupling agent, and the silane coupling agent used is KH550 or KH560.

[0039] The specific modification methods are as follows: s1. Dry the light diffuser at 120°C for 120 minutes to remove surface moisture; S2. Dissolve the silane coupling agent in an ethanol / water mixture (ethanol:water = 9:1) at a mass ratio of 1% to 2% to obtain a coupling agent solution; s3. Add the light diffusing agent to the coupling agent solution, ultrasonicate at a power of 10-100 W for 60 min, filter, wash, and dry to obtain a modified light diffusing agent.

[0040] In a specific embodiment, the 1-3 μm light diffuser modified with a silane coupling agent has a nearly cubic morphology, which can reduce light scattering loss, improve optical uniformity, and reduce the agglomeration of particles within the component, thereby helping to further improve the transmittance and impact strength of PC light diffusion masterbatch injection molded products.

[0041] In some specific embodiments, the weight proportion of the compatibilizer can be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, or 8 parts.

[0042] In some specific embodiments, the compatibilizer is maleic anhydride grafted polypropylene.

[0043] In some specific embodiments, the weight average molecular weight of the maleic anhydride grafted polypropylene is 20,000-60,000. As an example, the weight average molecular weight of the maleic anhydride grafted polypropylene can be 20,000, 25,000, 30,000, 35,000, 40,000, 45,000, 50,000, 55,000, or 60,000, as long as the weight average molecular weight of the maleic anhydride grafted polypropylene is within this range.

[0044] In some specific embodiments, the light diffuser needs to be evenly dispersed in the PC matrix to effectively scatter light. However, waste PC is prone to agglomeration due to impurities and polarity differences. The compatibilizer can reduce the interfacial tension between the light diffuser and PC through interfacial coupling, further improving the optical properties of PC light diffusion masterbatch injection-molded products.

[0045] In some specific embodiments, the grafting rate of maleic anhydride grafted polypropylene is 0.8-1.5%. As an example, the grafting rate of maleic anhydride grafted polypropylene can be 0.8%, 1.0%, 1.2%, 1.3%, 1.4%, or 1.5%, as long as the grafting rate of maleic anhydride grafted polypropylene is within this range.

[0046] In some specific embodiments, the weight proportion of the chain extender can be 1 part, 2 parts, 3 parts, 4 parts, or 5 parts.

[0047] In some specific embodiments, the chain extender is bisphenol A epoxy resin. Waste PC can suffer molecular weight loss due to repeated processing, affecting the impact strength of injection-molded plastic products. However, by adding bisphenol A epoxy resin as a chain extender, this embodiment repairs the molecular chains of waste PC plastics and improves their impact strength.

[0048] In some specific embodiments, the weight percentage of the chain extender can be 1, 2, 3, 4, or 5.

[0049] In some specific embodiments, the chain extender can repair the molecular chain skeleton, and the compatibilizer can enhance the interfacial bonding strength. The two together inhibit crack propagation and overall improve the optical and mechanical properties of PC light diffusion masterbatch injection molded products.

[0050] In some specific embodiments, the antioxidant is tris (2,4-di-tert-butylphenyl) phosphite. As an example, the weight percentage of the antioxidant can be 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, as long as the weight percentage of the antioxidant is within the range. In some specific embodiments, the weight percentage of the anti-ultraviolet agent can be 0.5 parts, 1 part, 1.5 parts, or 2 parts, as long as the weight percentage of the anti-ultraviolet agent is within the range.

[0051] In some specific embodiments, the anti-UV agent is 2-(2H-benzotriazole-2-yl)-4,6-di-tert-amylphenol. 2-(2H-benzotriazole-2-yl)-4,6-di-tert-amylphenol can diffuse light, dispersing it when it strikes the surface of a plastic product made with PC light-diffusing masterbatch, preventing it from directly reaching the eyes. It can also slow down the decomposition of the plastic product made with PC light-diffusing masterbatch by naturally occurring ultraviolet rays, thereby increasing its service life.

[0052] In some specific embodiments, the weight percentage of the heat stabilizer can be 0.5 parts, 1 part, 1.5 parts, or 2 parts, as long as the weight percentage of the heat stabilizer is within the range.

[0053] In some specific embodiments, the heat stabilizer is calcium stearate and / or zinc stearate.

[0054] In some specific embodiments, antioxidants can capture free radicals and inhibit oxidative degradation, while thermal stabilizers delay thermal decomposition by neutralizing acidic impurities (such as HCl produced by PC hydrolysis). The combination of the two can form a stable protective layer to inhibit further degradation of waste PC during processing.

[0055] The second embodiment of the present invention provides a method for preparing PC light diffusion masterbatch, which specifically includes the following steps: S1. The waste PC plastic is sequentially washed, crushed, melted, and filtered to obtain purified waste PC plastic; S2. The purified waste PC plastic is mixed with a chain extender, a compatibilizer, an antioxidant, an anti-UV agent, and a heat stabilizer in proportion to obtain a premix; S3. The premix is ​​mixed with the light diffusing agent and then fed into a twin-screw extruder for extrusion and granulation to obtain PC light diffusing masterbatch.

[0056] In some specific embodiments, the particle size of the waste PC plastic after crushing in step S1 is 1-5 mm. As an example, the particle size of the crushed waste PC plastic is 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm. It is sufficient that the particle size of the crushed waste PC plastic is within this range.

[0057] In some specific embodiments, the melting temperature of the waste PC plastic in step S1 is 260-280°C. As an example, the melting temperature of the waste PC plastic can be 260°C, 265°C, 270°C, 275°C, or 280°C, as long as the melting temperature of the waste PC plastic is within the range.

[0058] In some specific embodiments, the mesh size of the filter used for melt filtration in step S1 is 200-500 mesh. As an example, the filter can be 200 mesh, 250 mesh, 300 mesh, 350 mesh, 400 mesh, 450 mesh, or 500 mesh, as long as the mesh size of the filter is within the range.

[0059] In some specific embodiments, step S2 is mixed by stirring, the stirring speed is 800-1200 rpm, and the stirring time is 5-10 min.

[0060] In some specific embodiments, as an example, the stirring speed in step S2 can be 800 rpm, 900 rpm, 1000 rpm, 1100 rpm, or 1200 rpm, as long as the stirring speed is within the range.

[0061] In some specific embodiments, as an example, the stirring time in step S2 can be 5 min, 6 min, 7 min, 8 min, 9 min, or 10 min, as long as the stirring time is within the range.

[0062] In some specific embodiments, the extrusion temperature in step S3 is 260-280° C., and the twin-screw speed is 200-400 rpm.

[0063] In some specific embodiments, as an example, the extrusion temperature in step S3 can be 260°C, 265°C, 270°C, 275°C, or 280°C, as long as the extrusion temperature is within the range.

[0064] In some specific embodiments, as an example, the rotational speed of the twin screw in step S3 can be 200 rpm, 250 rpm, 300 rpm, 350 rpm, or 400 rpm, as long as the rotational speed of the twin screw is within the range.

[0065] The third embodiment of the present invention provides an application of PC light-diffusing masterbatch. Specifically, the PC light-diffusing masterbatch is used to prepare one or more of LED lampshades, automobile interior lampshades, and electronic display light guide plates through injection molding.

[0066] In some specific embodiments, the injection molding temperature is 260-300° C., and the pressure is 60-100 MPa.

[0067] In some specific embodiments, as an example, the injection molding temperature of PC light diffusion masterbatch can be 260°C, 265°C, 270°C, 275°C, 280°C, 285°C, 290°C, 295°C, or 300°C, as long as the injection molding temperature of PC light diffusion masterbatch is within the range.

[0068] In some specific embodiments, as an example, the injection molding pressure of the PC light diffusion masterbatch can be 60MPa, 65MPa, 70MPa, 75MPa, 80MPa, 85MPa, 90MPa, 95MPa, or 100MPa, as long as the injection molding pressure of the PC light diffusion masterbatch is within the range.

[0069] Test Standard Description Light transmittance and haze: ASTM D1003 (using a haze meter, light source wavelength 550nm).

[0070] Impact strength: ISO179 (Charpy impact test, notched specimen).

[0071] Example 1 PC light diffusion masterbatch components: Waste PC (source of car lampshades): 75kg; Bisphenol A epoxy resin (chain extender): 2kg; Maleic anhydride grafted polypropylene (compatibilizer, grafting rate 1.2%): 4kg; Surface modified SiO2 (particle size 1~2μm, KH-560 treatment): 13kg; Antioxidant (tris(2,4-di-tert-butylphenyl)phosphite): 1.5kg; Anti-ultraviolet agent (2-(2H-benzotriazole-2-yl)-4,6-di-tert-amylphenol): 1kg; Heat stabilizer (calcium stearate): 3.5kg.

[0072] Preparation method: Pretreatment of waste PC: Cleaning: Use ultrasonic cleaning machine (frequency 40kHz) to remove surface oil.

[0073] Crushing: Crushing waste PC into particles of 3mm in size.

[0074] Melt filtration: melt at 260°C and filter impurities through a 300-mesh filter to obtain purified waste PC.

[0075] Premix: Put the purified waste PC, chain extender, compatibilizer, antioxidant, anti-ultraviolet agent and heat stabilizer into a high-speed mixer.

[0076] Mixing parameters: rotation speed 1000 rpm, time 8 min.

[0077] Extrusion granulation: The premix and light diffuser are added to the twin-screw extruder.

[0078] Process parameters: temperature range 260~270℃, screw speed 300rpm.

[0079] After extrusion, the product is water-cooled and pelletized to obtain PC light-diffusing masterbatch.

[0080] Injection molding: Injection temperature: 280℃; Injection pressure: 80MPa; Molded products: standard test specimens (size 80 mm × 10 mm × 4 mm, notch depth 2 mm).

[0081] Performance testing: Light transmittance (ASTM D1003): 88% Haze (ASTM D1003): 83% Impact strength (ISO179): 58kJ / m².

[0082] Example 2 PC light diffusion masterbatch components: Waste PC (source of electronic housing): 70kg; Bisphenol A epoxy resin (chain extender): 3kg; Maleic anhydride grafted polypropylene (compatibilizer, grafting rate 1.2%): 5kg; Surface modified BaSO4 (particle size 2~3μm, KH-550 treatment): 15kg; Antioxidant: 2kg; Anti-ultraviolet agent: 1kg; Heat stabilizer (zinc stearate): 4kg.

[0083] Preparation method: Pretreatment of waste PC: Crushed particle size: 2mm; Melting temperature: 270℃; Filter mesh number: 400 mesh; Premix: Speed: 900 rpm, time 7 min; Extrusion granulation: Temperature range: 270~280℃; Screw speed: 350rpm; Injection molding: Injection temperature: 290℃; Injection pressure: 70MPa; Performance testing: Light transmittance: 86% Haze: 88% Impact strength: 55kJ / m².

[0084] Example 3 PC light diffusion masterbatch components: Used PCs (source of discarded optical discs): 65kg Bisphenol A epoxy resin (chain extender): 4kg Maleic anhydride grafted polypropylene (compatibilizer, grafting rate 1.5%): 6kg Mixed light diffuser (SiO2 1~2μm + BaSO4 3~4μm, mass ratio 1:1, KH-560 treatment): 18kg; Antioxidant: 3kg; Anti-ultraviolet agent: 2kg; Heat stabilizer (calcium stearate): 2kg.

[0085] Preparation method: Pretreatment of waste PC: Crushed particle size: 4mm; Melting temperature: 280℃; Filter mesh number: 500 mesh; Premix: Speed: 1200 rpm, time: 5 min; Extrusion granulation: Temperature range: 275~280℃; Screw speed: 400rpm; Injection molding: Injection temperature: 300℃; Injection pressure: 100MPa; Performance testing: Light transmittance: 88%.

[0086] Haze: 80%.

[0087] Impact strength: 58kJ / m².

[0088] Test Examples and Comparative Examples In order to further verify the performance of the PC light diffusion masterbatch provided by the present invention, a comparative test was performed below.

[0089] Test Example 1: The only difference from Example 3 is the lack of a compatibilizer and a chain extender.

[0090] Test Example 2: The only difference from Example 3 is the lack of a compatibilizer.

[0091] Test Example 3: The only difference from Example 3 is the lack of a chain extender.

[0092] Comparative Example: The only difference from Example 3 is that new PC masterbatch is used.

[0093] The performance of the PC light diffusion masterbatch plastic products prepared by the injection molding method of Example 3 are now tested on the light diffusion PC masterbatch obtained in Test Examples 1 to 3, Example 3 and the comparative example. The test results are shown in the following table: The test results show that: (1) When the chain extender and the compatibilizer are combined, the impact strength is improved far more than the combined effect of the single components (28 vs. 20 kJ / m²).

[0094] (2) The light diffuser is evenly dispersed under the action of the compatibilizer, and the transmittance and haze are close to the level of new PC.

[0095] (3) The light transmittance (88%) and impact strength (58 kJ / m²) of Example 3 reached 97% and 93% of those of new PC, and thus has practical application value.

[0096] It should be understood that the application of the present invention is not limited to the above examples. For those skilled in the art, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A PC light diffusion masterbatch, characterized in that: Calculated by weight, it includes the following components: Waste PC plastic: 60~80 parts; Light diffuser: 5~20 parts; Compatibilizer: 2~8 parts; Chain extender: 1~5 parts; Antioxidant: 0.5~3 parts; Anti-ultraviolet agent: 0.5~2 parts; Heat stabilizer: 0.5~2 parts; The total weight of each component is 100 parts; The waste PC plastic is purified PC waste plastic obtained through cleaning, crushing, melting and filtering.

2. A PC light diffusion masterbatch according to claim 1, characterized in that: The waste PC plastic is selected from one or more of discarded optical discs, discarded automobile lampshades, and discarded electronic product casings obtained from PC as raw materials.

3. A PC light diffusion masterbatch according to claim 1, characterized in that: The light diffusing agent is silicon dioxide and / or barium sulfate; The particle size of the light diffusing agent is 1-5 μm; The surface of the light diffuser is modified by a silane coupling agent.

4. A PC light diffusion masterbatch according to claim 1, characterized in that: The compatibilizer is maleic anhydride grafted polypropylene with a weight average molecular weight of 20,000-60,000 and a grafting rate of 0.8-1.5%.

5. A PC light diffusion masterbatch according to claim 1, characterized in that: The chain extender is bisphenol A epoxy resin.

6. A PC light diffusion masterbatch according to claim 1, characterized in that: The antioxidant is tris(2,4-di-tert-butylphenyl)phosphite.

7. A PC light diffusion masterbatch according to claim 1, characterized in that: The anti-ultraviolet agent is 2-(2H-benzotriazole-2-yl)-4,6-di-tert-amylphenol.

8. A PC light diffusion masterbatch according to claim 1, characterized in that: The heat stabilizer is calcium stearate and / or zinc stearate.

9. A method for preparing the PC light diffusion masterbatch according to any one of claims 1 to 8, characterized in that: The following steps are involved: The waste PC plastic is sequentially washed, crushed, melted and filtered to obtain purified waste PC plastic; The purified waste PC plastic is mixed with a chain extender, a compatibilizer, an antioxidant, an anti-ultraviolet agent, and a heat stabilizer in proportion to obtain a premix; The premix and the light diffusing agent are mixed and then put into a twin-screw extruder for extrusion and granulation to obtain PC light diffusing masterbatch.

10. An application of the PC light diffusion masterbatch according to claim 9, characterized in that: The PC light diffusion masterbatch is used to prepare one or more of LED lampshades, automobile interior lampshades, and electronic display light guide plates through injection molding; The injection molding temperature is 260-300° C., and the pressure is 60-100 MPa.

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