Low-warpage PC (polycarbonate) composite material as well as preparation method and application thereof

Abstract

The invention provides a low-warpage PC composite material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The low-warpage PC composite material is prepared from the following raw materials in parts by mass: 45 to 55 parts of PC resin, 15 to 20 parts of modified glass fiber, 8 to 12 parts of filler, 0.8 to 1.2 parts of a core-shell type crystal nucleation warpage inhibitor, 5 to 8 parts of a toughening agent, 0.2 to 0.4 part of an antioxidant, 0.3 to 0.5 part of a lubricating agent and 0.2 to 0.3 part of an ultraviolet light absorber. The PC composite material provided by the invention has low warpage, high rigidity and high fluidity, and can be directly subjected to injection molding to obtain the thin-wall air deflector.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a low-warpage PC composite material, its preparation method, and its application. Background Technology

[0002] As consumers demand higher levels of comfort from air conditioners, "windless" technology has become a key selling point for high-end air conditioners. This technology uses micro-perforated airflow and multi-layered air guides to achieve gentle diffusion of cool air, avoiding direct airflow onto the human body. However, as a core moving component, the air guide is constantly exposed to start-stop cycles, temperature variations (-10℃ to 60℃), and humidity fluctuations, making it prone to thermal deformation, warping, and stress cracking.

[0003] Existing air guide plates mostly use ABS, PP, or ordinary PC+GF materials, which have the following defects: ABS / PP materials: poor heat resistance (HDT < 80℃), easily softening and deforming at high temperatures; poor dimensional stability, easily warping due to humid heat cycling; conventional PC+GF materials: although they have high strength and heat resistance, the warping problem is particularly prominent due to the inherent high melt viscosity and internal stress of PC, coupled with the anisotropic shrinkage caused by GF orientation, making it difficult to meet the precision requirement of air guide plate assembly gap ≤0.3mm; lack of targeted interface control: traditional coupling agents (such as KH550) have limited improvement on the PC / GF interface, resulting in weak interfacial bonding, affecting rigidity transfer efficiency and long-term durability.

[0004] Therefore, there is an urgent need to develop a reinforced PC composite material with low warpage, high dimensional stability, and easy injection molding for use in windless air conditioning air guide plates. Summary of the Invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a low-warpage PC composite material, its preparation method and application.

[0006] The present invention proposes a low-warpage PC composite material comprising the following raw materials in parts by weight: 45-55 parts PC resin, 15-20 parts modified glass fiber, 8-12 parts filler, 0.8-1.2 parts core-shell crystal nucleation anti-warpage agent, 5-8 parts toughening agent, 0.2-0.4 parts antioxidant, 0.3-0.5 parts lubricant, and 0.2-0.3 parts ultraviolet absorber.

[0007] Preferably, the melt index of the PC resin under the test conditions of 300℃ / 1.2kg is 10~12g / 10min.

[0008] Preferably, the modified glass fiber is an alkali-free flat glass fiber with a single filament cross-sectional axis ratio of 3 to 5 and an average length of 4 to 6 mm.

[0009] Preferably, the preparation of the modified glass fiber includes subjecting the glass fiber to a first heat treatment, followed by cooling, washing, and drying to obtain pretreated glass fiber; placing the pretreated glass fiber in a silane coupling agent solution, subjecting it to a second heat treatment, and then removing and drying it to obtain the final product.

[0010] More preferably, the temperature of the first heat treatment is 400~450℃, and the time of the first heat treatment is 1~2h.

[0011] More preferably, the washing process includes washing with water first, then washing with an acid solution, and finally washing with water again.

[0012] More preferably, the acid solution is selected from one or more of hydrochloric acid and sulfuric acid; the mass concentration of the acid solution is 3 to 10 wt%.

[0013] More preferably, the preparation of the silane coupling agent solution includes mixing the silane coupling agent, ethanol, and water evenly, adding acetic acid to adjust the pH to 4-5, stirring, and allowing it to stand for aging, thus obtaining the solution.

[0014] More preferably, the silane coupling agent is selected from one or more of KH550 and KH570.

[0015] More preferably, the mass ratio of the silane coupling agent, ethanol, and water is (0.5~3):(90~95):(5~10).

[0016] More preferably, the mass ratio of the pretreated glass fiber to the silane coupling agent solution is 1:(8~15).

[0017] More preferably, the temperature of the second heat treatment is 60~70℃, and the time of the second heat treatment is 0.1~1h.

[0018] Preferably, the filler is a modified SiO2-α-Al2O3 composite microsphere with a particle size D50 of 3~5μm and a sphericity ≥0.92. The preparation method of the modified SiO2-α-Al2O3 composite microsphere includes: mixing TEOS, aluminum isopropoxide, and anhydrous ethanol evenly, adding ammonia water, heating to T1 for 2~3 hours; heating to T2 for 4~6 hours; centrifuging, washing, ball milling, and calcining to obtain SiO2-α-Al2O3 composite microspheres; placing the SiO2-α-Al2O3 composite microspheres in a silane coupling agent solution, heating to T3 for 1~2 hours, centrifuging, washing, drying, and sieving to obtain the final product.

[0019] More preferably, the mass ratio of TEOS, aluminum isopropoxide, and anhydrous ethanol is (50~70):(20~30)(700~1000).

[0020] More preferably, the molar ratio of Si / Al in the TEOS and aluminum isopropoxide is (2~3):1.

[0021] More preferably, the mass concentration of the ammonia water is 25-28 wt%, and the mass of the ammonia water is 0.1-3% of the total mass of TEOS, aluminum isopropoxide, and anhydrous ethanol.

[0022] More preferably, the mass ratio of the SiO2-α-Al2O3 composite microspheres to the silane coupling agent solution is 1:(8~15).

[0023] More preferably, T1 is 50~60℃, T2 is 70~80℃, and T3 is 60~70℃.

[0024] More preferably, the ball milling speed is 100~500 rpm, the ball milling time is 1~5 h, and the particle size D50 after ball milling is 3~5 μm.

[0025] More preferably, the calcination temperature is 500~700℃ and the calcination time is 0.5~2h.

[0026] More preferably, the preparation of the silane coupling agent solution includes mixing the silane coupling agent, ethanol, and water evenly, adding acetic acid to adjust the pH to 4-5, stirring, and allowing it to stand for aging, thus obtaining the solution.

[0027] More preferably, the silane coupling agent is selected from one or more of KH550 and KH570.

[0028] More preferably, the mass ratio of the silane coupling agent, ethanol, and water is (0.5~3):(90~95):(5~10).

[0029] More preferably, the mesh size of the sieve is 200 to 600 mesh.

[0030] Preferably, the core-shell type crystal nucleation inhibitor is a ternary core-shell nanoparticle of styrene-glycidyl methacrylate-organophosphate, with a core layer Tg > 120 °C and a shell layer containing bifunctional epoxy and carboxyl groups, which can react with the hydroxyl / carboxyl groups at the end of the PC chain to form an "anchoring-crystallization-anti-warping" network.

[0031] Preferably, the preparation of the core-shell crystal nucleation inhibitor includes: ultrasonically treating 60-70 parts of styrene, 2-5 parts of methacrylic acid, and 0.8-1.5 parts of emulsifier to obtain a core layer pre-emulsion; adding the core layer pre-emulsion and an aqueous solution containing 0.3-0.6 parts of KPS at 70-80°C under a protective atmosphere, and then adding 0.5-1 parts of crosslinking agent, and maintaining the temperature to obtain a core layer emulsion; ultrasonically treating 30-40 parts of butyl acrylate, 3-8 parts of methacrylic acid, and 1.7-3 parts of emulsifier to obtain a shell layer pre-emulsion; heating the core layer emulsion to 80-90°C, adding the shell layer pre-emulsion and an aqueous solution containing 0.2-0.5 parts of KPS, and then adding 0.8-1.5 parts of crosslinking agent and 1-1.5 parts of organophosphate, reacting, and then cooling, adjusting the pH, washing, and drying to obtain the final product.

[0032] More preferably, the emulsifier includes SDS and OP-10, and the mass ratio of SDS to OP-10 is (1~3):1.

[0033] More preferably, the crosslinking agent is EGDMA.

[0034] More preferably, the organophosphate is selected from one or more of 2,2'-methylene bis(4,6-di-tert-butylphenyl)phosphate, sodium bis(p-tert-butylphenyl)phosphate, and sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl)phosphate.

[0035] More preferably, the pH adjustment is 7-8.

[0036] More preferably, the protective gas is selected from one or more of nitrogen and argon.

[0037] More preferably, the core / shell mass ratio is 1:0.5 to 1:0.7 (an excessively thick shell reduces nucleation efficiency); the shell MAA content is >5% to enhance hydrogen bonding with PC; and the final particle size D50 is controlled at 100~150nm (monitored by a laser particle size analyzer).

[0038] Preferably, the toughening agent is an ethylene-butyl acrylate-glycidyl methacrylate (EBA-GMA) terpolymer, with EBA content ≥35wt% and GMA content ≥6wt%.

[0039] Preferably, the antioxidants include antioxidant 1076 and antioxidant 168, and the mass ratio of antioxidant 1076 to antioxidant 168 is (1~2):(1~2).

[0040] Preferably, the lubricant comprises pentaerythritol stearate and silicone, wherein the mass ratio of pentaerythritol stearate to silicone is (1~2):1.

[0041] Preferably, the ultraviolet absorber is benzotriazole UV-360.

[0042] A method for preparing a low-warpage PC composite material includes the following steps: PC resin, a core-shell crystal nucleation anti-warpage agent, a toughening agent, an antioxidant, a lubricant, and an ultraviolet absorber are added to a high-speed mixer filled with a protective gas atmosphere and mixed for 3-10 minutes to obtain a premix. The high-speed mixer operates at a speed of 600-1000 rpm and a temperature of 50-80℃. The premix is ​​fed into the main feed port of a parallel twin-screw extruder, and modified glass fibers and fillers are forcibly fed in via side feeding. The extrusion temperature of the parallel twin-screw extruder is 250-270℃, the screw speed is 300-600 rpm, and the vacuum degree is -0.1 to -0.05 MPa. After stretching, cooling, and pelletizing, the final product is obtained.

[0043] Application of the above-mentioned PC composite material or the PC composite material prepared by the above-mentioned method in windless air conditioning air guide plate, concealed air duct plate or thin-walled appearance structural component.

[0044] Preferably, the application includes: drying the PC composite material and then injection molding it.

[0045] More preferably, the temperature of the injection mold is 100~110℃, the injection pressure is 60~100 MPa, and the cooling time is 10~50 s.

[0046] The beneficial effects of this invention are as follows:

[0047] The PC composite material provided by this invention uses polycarbonate (PC) as the matrix and is reinforced by a "modified glass fiber + filler" synergistic system, combined with a self-synthesized "core-shell crystal nucleation and anti-warping agent". While maintaining high rigidity and high toughness, the warpage is controlled to ≤0.5 mm / 300 mm, which can meet the "large size - thin wall - high flatness" molding requirements of windless air conditioning air guide plate.

[0048] In this invention, the nucleation and anti-warping agent of the core-shell crystal significantly reduces the cooling orientation difference of PC molecular chains through the "anchoring-crystallization" mechanism, thereby inhibiting warping; in this invention, the modified glass fiber and filler work together to make the longitudinal / transverse shrinkage ratio close to 1:1, further smoothing the surface. Detailed Implementation

[0049] The technical solution of the present invention will be described in detail through specific embodiments.

[0050] In the following examples and comparative examples, the specific information regarding the raw materials used is as follows:

[0051] PC resin: Teijin L-1250Y, MFR=10 g / 10min;

[0052] Toughening agent: EBA-GMA: DuPont Elvaloy PTW;

[0053] Antioxidant: Antioxidant 1076 and Antioxidant 168 are composed of antioxidants in a mass ratio of 1:1.

[0054] Lubricant: Pentaerythritol stearate and silicone in a mass ratio of 2:1.

[0055] The ultraviolet absorber is benzotriazole UV-360.

[0056] The modified glass fiber is a flat glass fiber: Jushi ECS-301HP-3-M4, with a fiber diameter of 10~15μm and an axial ratio of 4. The preparation of the modified glass fiber includes: placing the flat glass fiber in a muffle furnace and heat-treating it at 430℃ for 1.5 hours to remove surface wetting agents and organic matter; after cooling, rinsing it three times with deionized water, then immersing it in dilute hydrochloric acid (5wt%, room temperature) for 10 minutes to activate the surface silanol groups; finally, rinsing it with deionized water until neutral (pH...). 7) Dry the pretreated glass fiber in an oven at 110℃ for 1 hour to obtain pretreated glass fiber; dissolve KH-550 in an ethanol / water mixed solvent (volume ratio 95:5), controlling the mass concentration of KH-550 at 1.5%, adjust the pH to 4 with acetic acid (to promote silane hydrolysis), stir for 30 minutes, and let it stand for 1 hour to obtain a silane coupling agent solution; immerse the pretreated glass fiber in the silane coupling agent solution at a bath ratio of 1:10 (glass fiber:solution), and soak at room temperature for 8 minutes. Slowly increase the temperature to 65℃ and stir at a constant temperature for 25 minutes to ensure that the coupling agent is fully grafted onto the glass fiber surface. Remove the glass fiber and drain off excess solution (avoid dripping).

[0057] The filler was modified SiO2-α-Al2O3 composite microspheres with a sphericity ≥0.92 and D50=4 µm. The preparation of the modified SiO2-α-Al2O3 composite microspheres included: dissolving 60 g / L TEOS and 25 g / L aluminum isopropoxide in anhydrous ethanol, adding 1 vol% ammonia (25 wt%), stirring (400 rpm) at 55℃ for 2 hours to form a homogeneous sol; heating to 75℃, slowly adding deionized water (initiating hydrolysis-condensation), and aging at this temperature for 5 hours to generate SiO2-α-Al2O3 gel microspheres. These microspheres were centrifuged (9000 rpm, 15 minutes), washed three times with ethanol, and then ball-milled (2 hours, 200 rpm) to ensure sphericity and particle size (D50=4 µm). After sieving, the microspheres were calcined at 600℃ for 1 hour to obtain SiO2-α-Al2O3 composite microspheres. The sphericity (≥0.92) was verified using a laser particle size analyzer and SEM. KH-570 was dissolved in an ethanol / water mixture (90:10, volume ratio), the pH was adjusted to 4 with acetic acid, and the mixture was stirred and aged for 30 minutes (to promote silane hydrolysis) to obtain a KH-570 silane coupling agent solution. The KH-570 silane coupling agent solution was added to the composite microspheres (bath ratio 1:15, microspheres:solution), and ultrasonically dispersed for 10 minutes (40kHz). The mixture was then heated to 65℃ and stirred at a constant temperature for 1.5 hours (to graft silane onto the microsphere surface). The microspheres were recovered by centrifugation (10000 rpm, 10 minutes), washed with ethanol to remove unreacted substances, and vacuum dried (80℃, 2 hours) to obtain modified SiO2-α-Al2O3 composite microspheres. Post-processing and quality control: Sieving (400-mesh sieve) removes agglomerates to ensure monodispersity. FTIR is used to detect grafting effectiveness (characteristic peak at 1720 cm⁻¹). -1 (Corresponding to the C=O bond, confirming successful modification of KH-570). Store in a desiccator (humidity <30%) to avoid moisture absorption that could lead to performance degradation.

[0058] The preparation of the core-shell crystal nucleation inhibitor includes: ultrasonically treating 65 parts styrene, 4 parts methacrylic acid, and 1 part emulsifier for 15 min to obtain a core layer pre-emulsion; adding the core layer pre-emulsion and an aqueous solution containing 0.4 parts KPS (260 parts water) dropwise at 75°C under a nitrogen atmosphere; after 2 h of addition, adding 0.6 parts EGDMA and maintaining the temperature for 1.5 h to obtain a core layer emulsion with a particle size of 80 nm; and then adding 35 parts butyl acrylate, 4 parts methacrylic acid, and... Two parts of emulsifier were ultrasonically treated for 15 minutes to obtain a shell pre-emulsion. The core emulsion was heated to 80°C, and the shell pre-emulsion was slowly added dropwise for 1.5 hours. Then, 0.3 parts of KPS aqueous solution (120 parts water) were added and reacted for 2 hours. Then, 1 part of EGDMA and 1.2 parts of organophosphate were added and reacted for 2 hours. After cooling to 40°C and adjusting the pH to 7, the mixture was centrifuged and washed (12000 rpm, 20 minutes) and then freeze-dried into powder to obtain the product. The organophosphate was 2,2'-methylenebis(4,6-di-tert-butylphenyl)aluminum phosphate. The emulsifier was composed of SDS and OP-10 in a mass ratio of 3:1.

[0059] Unless otherwise specified, all materials and reagents used in the following examples and comparative examples are commercially available.

[0060] Example 1

[0061] A low-warpage PC composite material comprises the following raw materials in parts by weight: 50 parts PC resin, 18 parts modified glass fiber, 10 parts filler, 1 part core-shell crystal nucleation anti-warpage agent, 6 parts toughening agent, 0.3 parts antioxidant, 0.4 parts lubricant, and 0.2 parts ultraviolet absorber.

[0062] A method for preparing low-warpage PC composite material includes the following steps: PC resin, core-shell crystal nucleation anti-warpage agent, toughening agent, antioxidant, lubricant, and ultraviolet absorber are added to a high-speed mixer under nitrogen protection at a speed of 800 rpm and a temperature of 60 ℃ for 5 min to obtain a premix; the premix is ​​fed into the main feed port of a parallel twin-screw extruder, and modified glass fiber and filler are forcibly fed in through side feeding. The extrusion temperature is 260 ℃, the screw speed is 500 rpm, the vacuum degree is -0.08 MPa, and the material is stretched, cooled, and pelletized to obtain the final product.

[0063] Example 2

[0064] The only difference between Example 2 and Example 1 is that the raw material composition of the low warp PC composite material is different; otherwise, they are the same as in Example 1.

[0065] A low-warpage PC composite material comprises the following raw materials in parts by weight: 55 parts PC resin, 15 parts modified glass fiber, 8 parts filler, 0.8 parts core-shell crystal nucleation anti-warpage agent, 5 parts toughening agent, 0.3 parts antioxidant, 0.4 parts lubricant, and 0.2 parts ultraviolet absorber.

[0066] Example 3

[0067] The only difference between Example 3 and Example 1 is that the raw material composition of the low warp PC composite material is different; otherwise, they are the same as in Example 1.

[0068] A low-warpage PC composite material comprises the following raw materials in parts by weight: 45 parts PC resin, 20 parts modified glass fiber, 12 parts filler, 1.2 parts core-shell crystal nucleation anti-warpage agent, 8 parts toughening agent, 0.3 parts antioxidant, 0.4 parts lubricant, and 0.2 parts ultraviolet absorber.

[0069] Comparative Example 1

[0070] The only difference between Comparative Example 1 and Example 1 is that no nucleation inhibitor for core-shell crystals is added; otherwise, they are the same as in Example 1.

[0071] Comparative Example 2

[0072] The only difference between Comparative Example 2 and Example 1 is that the "modified glass fiber" is changed to "unmodified circular glass fiber (axial ratio ≈ 1)", and the rest is the same as Example 1.

[0073] Comparative Example 3

[0074] The only difference between Comparative Example 3 and Example 1 is that the "filler" is changed to "a mixture of SiO2 and α-Al2O3 in a mass ratio of 1.4:1", and the rest is the same as Example 1.

[0075] Comparative Example 4

[0076] The only difference between Comparative Example 4 and Example 1 is that the "core-shell crystal nucleation inhibitor" is changed to "organophosphate", and the rest is the same as Example 1.

[0077] After the above PC composite material was dehumidified and dried at 120℃ for 4 h, it was directly injection molded into a 300 mm × 40 mm × 1.2 mm air guide plate sample. The mold temperature was 100℃, the injection pressure was 80 MPa, and the cooling time was 25 s.

[0078] The tensile strength of the above-mentioned air guide plate samples was tested according to GB / T1040-2018, the flexural strength and flexural modulus according to GB / T9341-2008, the cantilever beam notched impact strength according to GB / T1843-2008, the density according to GB / T1033.1-2008, the melt flow index according to GB / T3682-2018, and the warpage according to Midea's enterprise standard "Air Guide Plate Warpage Test Method". The test results are shown in Table 1.

[0079] Table 1

[0080]

[0081] As can be seen from the data in Table 1, the warpage of the PC composite material prepared by this invention is ≤0.5 mm, which is ≥50% lower than that of comparative examples 1-4, meeting the "zero-step" assembly requirements of the windless air conditioning guide plate. Furthermore, the PC composite material prepared by this invention maintains high rigidity (flexural modulus ≥9000 MPa) and high flow (MFR ≥16 g / 10 min), and can be molded into a 0.8 mm thin-walled air guide plate without floating fibers or silver streaks. It can be directly injection molded or integrally encapsulated with TPE soft air duct in the same mold to achieve a "hard-soft" seamless air duct solution.

[0082] In summary, the PC composite material provided by this invention has low warpage, high rigidity, and high flowability, and can be directly injection molded to obtain thin-walled air guide plates.

[0083] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A low-warpage PC composite material, characterized in that, The raw materials include the following parts by weight: 45-55 parts PC resin, 15-20 parts modified glass fiber, 8-12 parts filler, 0.8-1.2 parts core-shell crystal nucleation inhibitor, 5-8 parts toughening agent, 0.2-0.4 parts antioxidant, 0.3-0.5 parts lubricant, and 0.2-0.3 parts ultraviolet absorber.

2. The PC composite material according to claim 1, characterized in that, The modified glass fiber is an alkali-free flat glass fiber with a single filament cross-sectional axis ratio of 3-5 and an average length of 4-6 mm. The preparation of the modified glass fiber includes subjecting the glass fiber to a first heat treatment, followed by cooling, washing, and drying to obtain pretreated glass fiber; placing the pretreated glass fiber in a silane coupling agent solution, subjecting it to a second heat treatment, and then removing and drying it to obtain the final product.

3. The PC composite material according to claim 2, characterized in that, The first heating treatment is performed at a temperature of 400-450℃ for 1-2 hours; the washing process includes washing with water, then washing with an acid solution, and finally washing with water again, wherein the acid solution is selected from one or more of hydrochloric acid and sulfuric acid; the mass concentration of the acid solution is 3-10 wt%; the mass ratio of the pretreated glass fiber to the silane coupling agent solution is 1:(8-15); the second heating treatment is performed at a temperature of 60-70℃ for 0.1-1 hours.

4. The PC composite material according to claim 1, characterized in that, The filler is a modified SiO2-α-Al2O3 composite microsphere with a particle size D50 of 3-5 μm and a sphericity ≥0.

92. The preparation method of the modified SiO2-α-Al2O3 composite microsphere includes: mixing TEOS, aluminum isopropoxide, and anhydrous ethanol evenly, adding ammonia, and heating to T1 for 2-3 hours; then heating to T2 for 4-6 hours, followed by centrifugation, washing, ball milling, and calcination to obtain the SiO2-α-Al2O3 composite microsphere; placing the SiO2-α-Al2O3 composite microsphere in a silane coupling agent solution, heating to T3 for 1-2 hours, centrifuging, washing, drying, and sieving to obtain the final product. The mass ratio of TEOS, aluminum isopropoxide, and anhydrous ethanol is (50~70):(20~30) (700~1000); the mass concentration of ammonia water is 25~28wt%, and the mass of ammonia water is 0.1~3% of the total mass of TEOS, aluminum isopropoxide, and anhydrous ethanol; the mass ratio of SiO2-α-Al2O3 composite microspheres and silane coupling agent solution is 1:(8~15); the temperature T1 is 50~60℃, T2 is 70~80℃, and T3 is 60~70℃; the ball milling speed is 100~500rpm, the ball milling time is 1~5h, and the particle size D50 after ball milling is 3~5 μm; the calcination temperature is 500~700℃, and the calcination time is 0.5~2h; the sieve mesh size is 200~600 mesh.

5. The PC composite material according to any one of claims 2 or 4, characterized in that, The preparation of the silane coupling agent solution includes mixing the silane coupling agent, ethanol, and water evenly, adding acetic acid to adjust the pH to 4-5, stirring, and allowing it to stand for aging. The silane coupling agent is selected from one or more of KH550 and KH570. The mass ratio of the silane coupling agent, ethanol, and water is (0.5-3):(90-95):(5-10).

6. The PC composite material according to claim 1, characterized in that, The PC resin has a melt index of 10~12g / 10min under the test conditions of 300℃ / 1.2kg; the toughening agent is an ethylene-butyl acrylate-glycidyl methacrylate (EBA-GMA) terpolymer, with EBA content ≥35wt% and GMA content ≥6wt%; the antioxidant includes antioxidant 1076 and antioxidant 168, with a mass ratio of antioxidant 1076 to antioxidant 168 of (1~2):(1~2); the lubricant includes pentaerythritol stearate and silicone, with a mass ratio of pentaerythritol stearate to silicone of (1~2):1; the ultraviolet absorber is UV-360.

7. The PC composite material according to claim 1, characterized in that, The preparation of the core-shell crystal nucleation inhibitor includes: ultrasonically treating 60-70 parts of styrene, 2-5 parts of methacrylic acid, and 0.8-1.5 parts of emulsifier to obtain a core layer pre-emulsion; adding the core layer pre-emulsion and an aqueous solution containing 0.3-0.6 parts of KPS at 70-80°C under a protective atmosphere, and then adding 0.5-1 parts of crosslinking agent, and maintaining the temperature to obtain a core layer emulsion; ultrasonically treating 30-40 parts of butyl acrylate, 3-8 parts of methacrylic acid, and 1.7-3 parts of emulsifier to obtain a shell layer pre-emulsion; heating the core layer emulsion to 80-90°C, adding the shell layer pre-emulsion and an aqueous solution containing 0.2-0.5 parts of KPS, and then adding 0.8-1.5 parts of crosslinking agent and 1-1.5 parts of organophosphate, reacting, and then cooling, adjusting the pH, washing, and drying to obtain the final product.

8. The PC composite material according to claim 7, characterized in that, The emulsifier includes SDS and OP-10, with a mass ratio of SDS to OP-10 of (1~3):1; the crosslinking agent is EGDMA; the organophosphate is selected from one or more of 2,2'-methylene bis(4,6-di-tert-butylphenyl)phosphate, sodium bis(p-tert-butylphenyl)phosphate, and sodium 2,2'-methylene bis(4,6-di-tert-butylphenyl)phosphate; the pH is adjusted to 7~8; and the protective gas is selected from one or more of nitrogen and argon.

9. A method for preparing the PC composite material according to any one of claims 1 to 8, characterized in that, Includes the following steps: PC resin, core-shell crystal nucleation inhibitor, toughening agent, antioxidant, lubricant, and UV absorber are added to a high-speed mixer filled with a protective gas atmosphere and mixed for 3-10 minutes to obtain a premix. The high-speed mixer speed is 600-1000 rpm, and the high-speed mixer temperature is 50-80 ℃. The premix is ​​fed into the main feed port of a parallel twin-screw extruder, and modified glass fiber and filler are forcibly fed in through side feeding. The extrusion temperature of the parallel twin-screw extruder is 250-270 ℃, the screw speed is 300-600 rpm, and the vacuum degree is -0.1--0.05 MPa. After stretching, cooling, and pelletizing, the final product is obtained.

10. The application of a PC composite material according to any one of claims 1 to 8 or a PC composite material prepared by the preparation method according to claim 9 in a windless air conditioning air guide plate, a concealed air duct plate, or a thin-walled appearance structural component.

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