A kind of anti-aging polycarbonate automobile lampshade and its preparation process

Abstract

The present invention relates to the technical field of automobile lampshades, specifically to an anti-aging polycarbonate automobile lampshade and a preparation process thereof. The scheme uses polycarbonate, branched polycarbonate, antioxidant, anti-dripping agent, flame retardant and lubricant as components of the automobile lampshade, extrudes granulation after mixing, dries, and prepares the automobile lampshade by injection molding. Polycarbonate has good transparency, excellent thermal stability and high impact strength, excellent mechanical properties, and can be widely used in home appliance housings, automobile parts, rail transportation and other fields; therefore, polycarbonate is used as the main material of the automobile lampshade, and the prepared automobile lampshade not only has excellent anti-ultraviolet aging performance, but also has excellent solvent resistance, high impact strength, excellent comprehensive performance, and high practicality.

Description

Technical Field

[0001] The invention relates to the technical field of automobile lampshades, in particular to an anti-aging polycarbonate automobile lampshade and a preparation process thereof. Background Art

[0002] Polycarbonate has excellent impact resistance, high light transmittance and good processing performance. It can generally be used in electronic appliances, medical treatment, food packaging, automotive parts manufacturing, rail transportation and other fields. Most car lampshades also use polycarbonate as the main processing raw material. During actual processing, polycarbonate is blended with additives, extruded into granules, and injection molded to produce car lampshades with excellent weather resistance and impact resistance.

[0003] Car lampshades are mostly in the external environment when in use, so they need to have excellent anti-UV aging performance, and at the same time have high requirements for waterproof and solvent resistance. However, the polycarbonate processed on the market today cannot meet our actual needs.

[0004] Based on this situation, the present application discloses an anti-aging polycarbonate automobile lampshade and a preparation process thereof to solve this technical problem. Summary of the invention

[0005] The object of the present invention is to provide an anti-aging polycarbonate automobile lamp cover and a preparation process thereof, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A preparation process of an anti-aging polycarbonate automobile lampshade, the specific preparation steps are:

[0008] S1: taking polycarbonate, branched polycarbonate, antioxidant, anti-drip agent, flame retardant and lubricant, mixing them and granulating them by twin-screw extrusion, the extrusion temperature is 260-265°C, and drying them at 110-115°C for 2-3h to obtain a dry material;

[0009] S2: transferring the dried material to an injection molding machine for injection molding, cooling, and obtaining the automobile lamp cover.

[0010] In a more optimized solution, the preparation steps of the branched polycarbonate are:

[0011] S11: Mix a benzophenone type UV absorber, triethylamine and tetrahydrofuran, stir evenly, add a mixture of acryloyl chloride and tetrahydrofuran in an ice water bath, react at 0-5°C for 5-6 hours, precipitate in ice water after the reaction, wash with a saturated sodium bicarbonate solution, and vacuum dry to obtain a UV absorber containing a double bond;

[0012] S12: Mix a UV absorber containing a double bond, tridecafluorooctyl methacrylate and butyl acetate, stir evenly, add 1 / 2 mass part of initiator, raise the temperature to 80-85° C. in an oil bath, react for 2-3 hours, add the remaining 1 / 2 mass part of initiator and divinylbenzene, continue to react for 3-4 hours, collect the product after the reaction, and obtain a fluorine-containing UV absorber;

[0013] S13: Mix a fluorine-containing ultraviolet absorber and acetone to obtain a monomer mixed solution, add polycarbonate particles to the monomer mixed solution, seal it and place it in a Co60 irradiation source for irradiation for 2 to 3 hours, evaporate the acetone under a vacuum environment of 40 to 45°C after irradiation, then heat it to 140 to 145°C, keep it warm for 2 to 3 hours, transfer it to a carbon tetrachloride solvent and dissolve it for 5 to 6 hours, filter it, and dry it in vacuum to obtain a branched polycarbonate.

[0014] In a more optimized solution, in step S1, the contents of the components include: by mass, 100-105 parts of polycarbonate, 6-8 parts of branched polycarbonate, 1-1.5 parts of antioxidant, 0.2-0.3 parts of anti-drip agent, 3-5 parts of flame retardant, and 0.5-1 part of lubricant.

[0015] In a more optimized solution, the flame retardant is potassium perfluorobutane sulfonate, the lubricant is pentaerythritol stearate; the anti-dripping agent is A-3800; and the antioxidant is antioxidant 1010.

[0016] In a more optimized solution, in step S11, the benzophenone ultraviolet absorber is any one of 2,2',4,4'-tetrahydroxybenzophenone and 2,4,4-trihydroxybenzophenone, or a combination of two thereof; the molar ratio of the benzophenone ultraviolet absorber, triethylamine, and acryloyl chloride is 1:1:(2-2.5).

[0017] In a more optimized solution, when the benzophenone ultraviolet absorber is a compound of 2,2',4,4'-tetrahydroxybenzophenone and 2,4,4-trihydroxybenzophenone, the molar ratio is 1:1.

[0018] According to a more optimized solution, in step S12, the mass ratio of the ultraviolet absorber containing double bonds, tridecafluorooctyl methacrylate, and divinylbenzene is 2:2:1; and the amount of the initiator used is 20 to 30 wt % of the amount of the ultraviolet absorber containing double bonds.

[0019] According to a more optimized solution, in step S13, the amount of the fluorine-containing ultraviolet absorber is 5-8wt% of the polycarbonate particles; and the radiation absorption dose rate is 6-8kG / h.

[0020] A more optimized solution is an automobile lampshade prepared according to any one of the above-mentioned processes for preparing an anti-aging polycarbonate automobile lampshade.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0022] The invention discloses an anti-aging polycarbonate automobile lampshade and a preparation process thereof. The scheme uses polycarbonate, branched polycarbonate, antioxidant, anti-dripping agent, flame retardant and lubricant as components of the automobile lampshade, extrudes granulation after mixing, dries, and prepares the automobile lampshade by injection molding. The polycarbonate has good transparency, excellent thermal stability and high impact strength, and excellent mechanical properties, and can be widely used in the fields of household appliance housings, automobile parts, rail transportation, etc. Therefore, polycarbonate (Bayer 2805, bisphenol A type polycarbonate) is used as the main material of the automobile lampshade, which can ensure that the automobile lampshade has excellent mechanical properties.

[0023] At the same time, during the research and development process, it was found that polycarbonate is prone to photoaging under the action of ultraviolet light, and is prone to hydrolysis when exposed to a hot and humid environment for a long time, which affects the comprehensive performance of the automobile lampshade and has poor solvent resistance. Therefore, in order to improve the aging resistance of the automobile lampshade, the plan introduces branched polycarbonate into polycarbonate. Branched polycarbonate has a long-chain branched structure. Introducing it into polycarbonate can improve the solvent resistance of the automobile lampshade, and the impact strength of the product is also improved.

[0024] On this basis, the scheme conceives branched polycarbonate. Since the automobile lampshade needs to have excellent anti-ultraviolet aging performance, the scheme introduces a UV absorber to ensure the product's anti-aging performance. During processing, the benzophenone UV absorber is first grafted with acryloyl chloride to modify the double bond on the benzophenone UV absorber. It should be emphasized here that: on the one hand, the scheme needs to ensure the UV absorption effect of the UV absorber, and on the other hand, the scheme needs to ensure that the subsequent processing of branched polycarbonate can be achieved. Therefore, the scheme defines "the benzophenone UV absorber" as The absorbent is any one of 2,2',4,4'-tetrahydroxybenzophenone and 2,4,4-trihydroxybenzophenone, or a combination of two thereof", the benzophenone-based UV absorber is limited to at least three hydroxyl functional groups, and at the same time, the molar ratio of the benzophenone-based UV absorber, triethylamine, and acryloyl chloride is 1:1:(2-2.5)". Under these two limited conditions, the prepared branched polycarbonate can not only ensure the UV absorption effect and achieve anti-UV aging, but also present a long-chain branched structure to ensure the comprehensive performance of the automobile lampshade.

[0025] Next, after modifying the double bond on the UV absorber, the scheme copolymerizes the UV absorber containing double bonds, tridecafluorooctyl methacrylate and divinylbenzene under the action of an initiator to obtain a fluorine-containing UV absorber. Here, when adding materials, tridecafluorooctyl methacrylate is first introduced, and a fluorine-containing group is introduced into the material to further improve the solvent resistance of the product, and then divinylbenzene is introduced, and it is defined that "the mass ratio of the UV absorber containing double bonds, tridecafluorooctyl methacrylate, and divinylbenzene is 2:2:1", and the generated fluorine-containing UV absorber and linear polycarbonate (selected from Taiwan Chimei, Wonderlite PC-110, number average molecular weight of 30000 Kg / mol, weight average molecular weight of 58000 Kg / mol, melt index of 10g / 10min (300℃ / 1.2kg)) are irradiated under gamma rays (Co60 irradiation source) to obtain a branched polycarbonate with a long-chain branched structure.

[0026] The invention discloses an anti-aging polycarbonate automobile lampshade and a preparation process thereof. The overall process design is relatively reasonable, the component formula of the automobile lampshade is appropriate, and the prepared automobile lampshade not only has relatively excellent anti-ultraviolet aging performance, but also has excellent solvent resistance, high impact strength, excellent comprehensive performance, and high practicality. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment 1:

[0029] A preparation process of an anti-aging polycarbonate automobile lampshade, the specific preparation steps are:

[0030] S1: By mass, 1 kg of polycarbonate, 80 g of branched polycarbonate, 10 g of antioxidant, 3 g of anti-drip agent, 50 g of flame retardant and 10 g of lubricant were taken, mixed and granulated by twin-screw extrusion. The extrusion temperature was 260°C and the screw speed was 50 r / min. The mixture was dried at 110°C for 3 h to obtain a dry material.

[0031] The flame retardant is potassium perfluorobutane sulfonate, the lubricant is pentaerythritol stearate; the anti-dripping agent is A-3800; the antioxidant is antioxidant 1010; and the polycarbonate is bisphenol A polycarbonate, Bayer 2805.

[0032] The preparation steps of branched polycarbonate are:

[0033] S11: Mix 0.05 mol 2,2',4,4'-tetrahydroxybenzophenone, 0.05 mol 2,4,4-trihydroxybenzophenone, 0.1 mol triethylamine and 200 mL tetrahydrofuran, stir evenly, add 0.24 mol acryloyl chloride and 100 mL tetrahydrofuran mixture under ice-water bath, react at 5°C for 5 h, precipitate in ice water after the reaction, wash with saturated sodium bicarbonate solution, and vacuum dry to obtain a UV absorber containing double bonds.

[0034] S12: 60g of UV absorber containing double bonds, 60g of methacrylate tridecafluorooctyl ester and 100g of butyl acetate were mixed and stirred evenly, 9g of initiator was added, the temperature was raised to 80°C under an oil bath, the reaction was continued for 3h, the remaining 9g of initiator and 30g of divinylbenzene were added, the reaction was continued for 3h, and the product was collected after the reaction to obtain a fluorine-containing UV absorber. The initiator was azobisisobutyronitrile.

[0035] S13: 8g of fluorine-containing ultraviolet absorber and 160g of acetone are mixed to obtain a monomer mixed solution, 100g of polycarbonate particles (Taiwan Chimei, Wonderlite PC-110, number average molecular weight of 30000Kg / mol) are added to the monomer mixed solution, and the mixture is sealed and placed in a Co60 irradiation source for irradiation for 2h, with an irradiation absorption dose rate of 8kG / h. After irradiation, the acetone is volatilized under a vacuum environment at 40°C, and the temperature is then raised to 140°C, and the mixture is kept warm for 3h, and then the mixture is transferred to 160g of carbon tetrachloride solvent and dissolved for 5h, filtered, and dried in vacuum to obtain branched polycarbonate.

[0036] S2: transferring the dried material to an injection molding machine for injection molding, filling the injection volume to 85% at an injection pressure of 100 MPa, and then filling the injection volume to 100% at an injection pressure of 90 MPa, and cooling to obtain the automobile lampshade.

[0037] Embodiment 2:

[0038] A preparation process of an anti-aging polycarbonate automobile lampshade, the specific preparation steps are:

[0039] S1: By mass, 1 kg of polycarbonate, 80 g of branched polycarbonate, 10 g of antioxidant, 3 g of anti-drip agent, 50 g of flame retardant and 10 g of lubricant were taken, mixed and granulated by twin-screw extrusion. The extrusion temperature was 260°C and the screw speed was 50 r / min. The mixture was dried at 115°C for 2 h to obtain a dry material.

[0040] The flame retardant is potassium perfluorobutane sulfonate, the lubricant is pentaerythritol stearate; the anti-dripping agent is A-3800; the antioxidant is antioxidant 1010; and the polycarbonate is bisphenol A polycarbonate, Bayer 2805.

[0041] The preparation steps of branched polycarbonate are:

[0042] S11: Mix 0.05 mol 2,2',4,4'-tetrahydroxybenzophenone, 0.05 mol 2,4,4-trihydroxybenzophenone, 0.1 mol triethylamine and 200 mL tetrahydrofuran, stir evenly, add 0.24 mol acryloyl chloride and 100 mL tetrahydrofuran mixture under ice water bath, react at 5°C for 5.5 h, precipitate in ice water after the reaction, wash with saturated sodium bicarbonate solution, and vacuum dry to obtain a UV absorber containing double bonds.

[0043] S12: 60g of a UV absorber containing a double bond, 60g of methacrylate tridecafluorooctyl ester and 100g of butyl acetate were mixed and stirred evenly, 9g of an initiator was added, the temperature was raised to 80°C under an oil bath, the reaction was continued for 2.5h, the remaining 9g of the initiator and 30g of divinylbenzene were added, the reaction was continued for 3.5h, and the product was collected after the reaction to obtain a fluorine-containing UV absorber. The initiator was azobisisobutyronitrile.

[0044] S13: 8g of fluorine-containing ultraviolet absorber and 160g of acetone are mixed to obtain a monomer mixed solution, 100g of polycarbonate particles (Taiwan Chimei, Wonderlite PC-110, number average molecular weight of 30000Kg / mol) are added to the monomer mixed solution, and the solution is sealed and placed in a Co60 irradiation source for irradiation for 2.5h, with an irradiation absorption dose rate of 8kG / h. After irradiation, the acetone is volatilized under a vacuum environment at 45°C, and the temperature is then raised to 145°C, and the solution is kept warm for 2.5h. The solution is transferred to 160g of carbon tetrachloride solvent and dissolved for 5.5h, filtered, and dried in vacuum to obtain a branched polycarbonate.

[0045] S2: transferring the dried material to an injection molding machine for injection molding, filling the injection volume to 85% at an injection pressure of 100 MPa, and then filling the injection volume to 100% at an injection pressure of 90 MPa, and cooling to obtain the automobile lampshade.

[0046] Embodiment 3:

[0047] A preparation process of an anti-aging polycarbonate automobile lampshade, the specific preparation steps are:

[0048] S1: By mass, 1 kg of polycarbonate, 80 g of branched polycarbonate, 10 g of antioxidant, 3 g of anti-drip agent, 50 g of flame retardant and 10 g of lubricant were taken, mixed and granulated by twin-screw extrusion. The extrusion temperature was 260°C and the screw speed was 50 r / min. The mixture was dried at 115°C for 3 h to obtain a dry material.

[0049] The flame retardant is potassium perfluorobutane sulfonate, the lubricant is pentaerythritol stearate; the anti-dripping agent is A-3800; the antioxidant is antioxidant 1010; and the polycarbonate is bisphenol A polycarbonate, Bayer 2805.

[0050] The preparation steps of branched polycarbonate are:

[0051] S11: Mix 0.05 mol 2,2',4,4'-tetrahydroxybenzophenone, 0.05 mol 2,4,4-trihydroxybenzophenone, 0.1 mol triethylamine and 200 mL tetrahydrofuran, stir evenly, add 0.24 mol acryloyl chloride and 100 mL tetrahydrofuran mixture under ice water bath, react at 5°C for 6 h, precipitate in ice water after the reaction, wash with saturated sodium bicarbonate solution, and vacuum dry to obtain a UV absorber containing a double bond.

[0052] S12: 60g of a UV absorber containing a double bond, 60g of methacrylate tridecafluorooctyl ester and 100g of butyl acetate were mixed and stirred evenly, 9g of an initiator was added, the temperature was raised to 85°C under an oil bath, the reaction was continued for 2h, the remaining 9g of the initiator and 30g of divinylbenzene were added, the reaction was continued for 4h, and the product was collected after the reaction to obtain a fluorine-containing UV absorber. The initiator was azobisisobutyronitrile.

[0053] S13: 8g of fluorine-containing ultraviolet absorber and 160g of acetone are mixed to obtain a monomer mixed solution, 100g of polycarbonate particles (Taiwan Chimei, Wonderlite PC-110, number average molecular weight of 30000Kg / mol) are added to the monomer mixed solution, and the mixture is sealed and placed in a Co60 irradiation source for irradiation for 3h, with an irradiation absorption dose rate of 8kG / h. After irradiation, the acetone is volatilized under a vacuum environment at 45°C, and the temperature is then raised to 145°C, and the mixture is kept warm for 2h, and the mixture is transferred to 160g of carbon tetrachloride solvent and dissolved for 6h, filtered, and dried in vacuum to obtain branched polycarbonate.

[0054] S2: transferring the dried material to an injection molding machine for injection molding, filling the injection volume to 85% at an injection pressure of 100 MPa, and then filling the injection volume to 100% at an injection pressure of 90 MPa, and cooling to obtain the automobile lampshade.

[0055] Comparative Example 1: Comparative Example 1 is a control experiment of Example 3, in which the benzophenone ultraviolet absorber is 2,4-dihydroxybenzophenone, and the other steps remain unchanged.

[0056] A preparation process of an anti-aging polycarbonate automobile lampshade, the specific preparation steps are:

[0057] S1: By mass, 1 kg of polycarbonate, 80 g of branched polycarbonate, 10 g of antioxidant, 3 g of anti-drip agent, 50 g of flame retardant and 10 g of lubricant were taken, mixed and granulated by twin-screw extrusion. The extrusion temperature was 260°C and the screw speed was 50 r / min. The mixture was dried at 115°C for 3 h to obtain a dry material.

[0058] The flame retardant is potassium perfluorobutane sulfonate, the lubricant is pentaerythritol stearate; the anti-dripping agent is A-3800; the antioxidant is antioxidant 1010; and the polycarbonate is bisphenol A polycarbonate, Bayer 2805.

[0059] The preparation steps of branched polycarbonate are:

[0060] S11: Mix 0.1 mol 2,4-dihydroxybenzophenone, 0.1 mol triethylamine and 200 mL tetrahydrofuran, stir evenly, add 0.12 mol acryloyl chloride and 100 mL tetrahydrofuran mixture under ice water bath, react at 5°C for 6 h, precipitate in ice water after the reaction, wash with saturated sodium bicarbonate solution, and vacuum dry to obtain a UV absorber containing double bonds.

[0061] S12: 60g of a UV absorber containing a double bond, 40g of methacrylate tridecafluorooctyl ester and 100g of butyl acetate were mixed and stirred evenly, 9g of an initiator was added, the temperature was raised to 85°C under an oil bath, the reaction was continued for 2h, the remaining 9g of the initiator and 20g of divinylbenzene were added, the reaction was continued for 4h, and the product was collected after the reaction to obtain a fluorine-containing UV absorber. The initiator was azobisisobutyronitrile.

[0062] S13: 8g of fluorine-containing ultraviolet absorber and 160g of acetone are mixed to obtain a monomer mixed solution, 100g of polycarbonate particles (Taiwan Chimei, Wonderlite PC-110, number average molecular weight of 30000Kg / mol) are added to the monomer mixed solution, and the mixture is sealed and placed in a Co60 irradiation source for irradiation for 3h, with an irradiation absorption dose rate of 8kG / h. After irradiation, the acetone is volatilized under a vacuum environment at 45°C, and the temperature is then raised to 145°C, and the mixture is kept warm for 2h, and the mixture is transferred to 160g of carbon tetrachloride solvent and dissolved for 6h, filtered, and dried in vacuum to obtain branched polycarbonate.

[0063] S2: transferring the dried material to an injection molding machine for injection molding, filling the injection volume to 85% at an injection pressure of 100 MPa, and then filling the injection volume to 100% at an injection pressure of 90 MPa, and cooling to obtain the automobile lampshade.

[0064] Comparative Example 2: Comparative Example 2 is a control experiment of Example 3, in which tridecafluorooctyl methacrylate is not introduced, and the other steps remain unchanged.

[0065] A preparation process of an anti-aging polycarbonate automobile lampshade, the specific preparation steps are:

[0066] S1: By mass, 1 kg of polycarbonate, 80 g of branched polycarbonate, 10 g of antioxidant, 3 g of anti-drip agent, 50 g of flame retardant and 10 g of lubricant were taken, mixed and granulated by twin-screw extrusion. The extrusion temperature was 260°C and the screw speed was 50 r / min. The mixture was dried at 115°C for 3 h to obtain a dry material.

[0067] The flame retardant is potassium perfluorobutane sulfonate, the lubricant is pentaerythritol stearate; the anti-dripping agent is A-3800; the antioxidant is antioxidant 1010; and the polycarbonate is bisphenol A polycarbonate, Bayer 2805.

[0068] The preparation steps of branched polycarbonate are:

[0069] S11: Mix 0.05 mol 2,2',4,4'-tetrahydroxybenzophenone, 0.05 mol 2,4,4-trihydroxybenzophenone, 0.1 mol triethylamine and 200 mL tetrahydrofuran, stir evenly, add 0.24 mol acryloyl chloride and 100 mL tetrahydrofuran mixture under ice water bath, react at 5°C for 6 h, precipitate in ice water after the reaction, wash with saturated sodium bicarbonate solution, and vacuum dry to obtain a UV absorber containing a double bond.

[0070] S12: 60g of a UV absorber containing a double bond and 100g of butyl acetate were mixed and stirred evenly, 9g of an initiator was added, the temperature was raised to 85°C in an oil bath, the reaction was continued for 2h, the remaining 3g of the initiator and 60g of divinylbenzene were added, the reaction was continued for 4h, and the product was collected after the reaction to obtain a fluorine-containing UV absorber. The initiator was azobisisobutyronitrile.

[0071] S13: 8g of fluorine-containing ultraviolet absorber and 160g of acetone are mixed to obtain a monomer mixed solution, 100g of polycarbonate particles (Taiwan Chimei, Wonderlite PC-110, number average molecular weight of 30000Kg / mol) are added to the monomer mixed solution, and the mixture is sealed and placed in a Co60 irradiation source for irradiation for 3h, with an irradiation absorption dose rate of 8kG / h. After irradiation, the acetone is volatilized under a vacuum environment at 45°C, and the temperature is then raised to 145°C, and the mixture is kept warm for 2h, and the mixture is transferred to 160g of carbon tetrachloride solvent and dissolved for 6h, filtered, and dried in vacuum to obtain branched polycarbonate.

[0072] S2: transferring the dried material to an injection molding machine for injection molding, filling the injection volume to 85% at an injection pressure of 100 MPa, and then filling the injection volume to 100% at an injection pressure of 90 MPa, and cooling to obtain the automobile lampshade.

[0073] Comparative Example 3: Comparative Example 3 is a control experiment of Example 3, in which only a fluorine-containing ultraviolet absorber is added, and the other steps remain unchanged.

[0074] A preparation process of an anti-aging polycarbonate automobile lampshade, the specific preparation steps are:

[0075] S1: By mass, take 1 kg of polycarbonate (bisphenol A polycarbonate, Bayer 2805), 80 g of polycarbonate particles (Taiwan Chi Mei, Wonderlite PC-110, number average molecular weight of 30000 kg / mol), 6 g of fluorine-containing UV absorber, 10 g of antioxidant, 3 g of anti-drip agent, 50 g of flame retardant and 10 g of lubricant, mix and granulate by twin-screw extrusion, the extrusion temperature is 260 ° C, the screw speed is 50 r / min, and dry at 115 ° C for 3 h to obtain a dry material.

[0076] S2: transferring the dried material to an injection molding machine for injection molding, filling the injection volume to 85% at an injection pressure of 100 MPa, and then filling the injection volume to 100% at an injection pressure of 90 MPa, and cooling to obtain the automobile lampshade.

[0077] Detection experiment:

[0078] 1. According to the methods disclosed in Examples 1-3 and Comparative Examples 1-3, the prepared dry materials were injection molded into strips, and their tensile strength and impact strength were tested, wherein the tensile strength test standard was ASTMD638, the strip type was Type I, the strip size was 57 mm × 13 mm × 3.2 mm, and the tensile speed was 50 mm / min; the impact strength test standard was ASTMD256, the strip size was 63.5 mm × 12.7 mm × 3.2 mm, and the impact pendulum kinetic energy was 5.5 J. The test temperature was 25°C.

[0079] 2. According to the methods disclosed in Examples 1-3 and Comparative Examples 1-3, the prepared dry materials were injection molded into specimens for aging resistance test. The test was carried out according to ASTM G155 standard, with a spectral irradiance of 0.5 W (340 nm), a black mark temperature of 65° C., a test chamber temperature of 40° C., and a relative humidity of 50%. After aging for 500 h, the color difference ΔE was recorded.

[0080] 3. According to the methods disclosed in Examples 1-3 and Comparative Examples 1-3, the prepared dry materials were injection molded into strips, and boiled in 70°C boiling water for 168 hours, and then taken out and retested for impact strength. The test temperature was 25°C.

[0081] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Tensile strength(MPa) 68.8 69.1 69.4 66.4 68.9 63.9 Impact strength (J / m) 779 782 786 762 781 724 Impact strength after boiling water (J / m) 649 653 658 597 603 545 ΔE after aging for 500h 0.52 0.48 0.49 0.61 0.53 0.69

[0082] Conclusion: The present invention discloses an anti-aging polycarbonate automobile lampshade and a preparation process thereof. The overall process design is relatively reasonable, the component formula of the automobile lampshade is appropriate, and the prepared automobile lampshade not only has excellent anti-ultraviolet aging performance, but also has excellent solvent resistance, high impact strength, excellent comprehensive performance, and high practicality.

[0083] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process for preparing an anti-aging polycarbonate automobile lampshade, characterized in that: The specific preparation steps are: S1: taking polycarbonate, branched polycarbonate, antioxidant, anti-drip agent, flame retardant and lubricant, mixing them and granulating them by twin-screw extrusion, the extrusion temperature is 260-265°C, and drying them at 110-115°C for 2-3h to obtain a dry material; In step S1, the contents of the components include: by mass, 100 to 105 parts of polycarbonate, 6 to 8 parts of branched polycarbonate, 1 to 1.5 parts of antioxidant, 0.2 to 0.3 parts of anti-drip agent, 3 to 5 parts of flame retardant, and 0.5 to 1 part of lubricant; S2: transferring the dried material to an injection molding machine for injection molding, cooling, and obtaining the automobile lampshade; The preparation steps of the branched polycarbonate are: S11: Mix a benzophenone type UV absorber, triethylamine and tetrahydrofuran, stir evenly, add a mixture of acryloyl chloride and tetrahydrofuran in an ice water bath, react at 0-5°C for 5-6 hours, precipitate in ice water after the reaction, wash with a saturated sodium bicarbonate solution, and vacuum dry to obtain a UV absorber containing a double bond; In step S11, the benzophenone ultraviolet absorber is any one of 2,2',4,4'-tetrahydroxybenzophenone and 2,4,4-trihydroxybenzophenone or a combination of two thereof; the molar ratio of the benzophenone ultraviolet absorber, triethylamine and acryloyl chloride is 1:1:(2-2.5); when the benzophenone ultraviolet absorber is a combination of 2,2',4,4'-tetrahydroxybenzophenone and 2,4,4-trihydroxybenzophenone, the molar ratio is 1:1; S12: Mix a UV absorber containing a double bond, tridecafluorooctyl methacrylate and butyl acetate, stir evenly, add 1 / 2 mass part of initiator, raise the temperature to 80-85° C. in an oil bath, react for 2-3 hours, add the remaining 1 / 2 mass part of initiator and divinylbenzene, continue to react for 3-4 hours, collect the product after the reaction, and obtain a fluorine-containing UV absorber; In step S12, the mass ratio of the ultraviolet absorber containing a double bond, tridecafluorooctyl methacrylate, and divinylbenzene is 2:2:1; the amount of the initiator used is 20-30wt% of the amount of the ultraviolet absorber containing a double bond; S13: Mix a fluorine-containing ultraviolet absorber and acetone to obtain a monomer mixed solution, add polycarbonate particles to the monomer mixed solution, seal it and place it in a Co60 irradiation source for irradiation for 2 to 3 hours, evaporate the acetone under a vacuum environment of 40 to 45°C after irradiation, then heat it to 140 to 145°C, keep it warm for 2 to 3 hours, transfer it to a carbon tetrachloride solvent and dissolve it for 5 to 6 hours, filter it, and dry it in vacuum to obtain a branched polycarbonate.

2. The process for preparing an anti-aging polycarbonate automobile lampshade according to claim 1, characterized in that: The flame retardant is potassium perfluorobutane sulfonate, the lubricant is pentaerythritol stearate; the anti-dripping agent is A-3800; and the antioxidant is antioxidant 1010.

3. The process for preparing an anti-aging polycarbonate automobile lampshade according to claim 1, characterized in that: In step S13, the amount of the fluorine-containing ultraviolet absorber is 5-8wt% of the polycarbonate particles; and the radiation absorption dose rate is 6-8kG / h.

4. An automobile lampshade prepared according to the process for preparing an anti-aging polycarbonate automobile lampshade according to any one of claims 1 to 3.