Preparation process of light-transmitting type metal texture plastic part

Abstract

The invention relates to a preparation process of a light-transmitting metal plastic part, and belongs to the technical field of composite materials. A diene monomer is introduced into matrix resin by using a modified monomer, cesium-tungsten bronze is modified, dienophile is introduced into the surface of cesium-tungsten bronze, and material repair is realized by using Diels-Alder reaction, so that the dispersity of cesium-tungsten bronze and the binding capacity of cesium-tungsten bronze and matrix resin are effectively improved; in addition, the cesium-tungsten bronze has an extremely strong absorption effect on ultraviolet light and infrared light, the infrared band in sunlight carries most heat and has an extremely strong heat effect, and the cesium-tungsten bronze can effectively absorb energy in the infrared light and convert the energy into heat energy, so that the heat-resistant performance of the material is improved. The temperature of the area where the material is located is increased, so that the reaction rate of the Diels-Alder reaction is effectively increased, and the self-repairing speed of the material under sunlight is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite materials, and in particular relates to a preparation process of a light-transmitting metal-textured plastic part. Background Art

[0002] Transparent plastic decorative parts with a metallic texture are very popular in the field of automotive exterior decoration. Such decorative parts are usually composed of a composite metal coating on the surface of a transparent substrate, which presents a metallic luster while maintaining light transmittance. Polymethacrylate (acrylic) resin has become the most commonly used base resin material in this field due to its excellent optical properties. Its visible light transmittance is as high as 92%, and its transparency is close to that of optical glass. It has excellent UV resistance and can still maintain good permeability after long-term exposure to outdoor environments. In addition, the molecular structure of polymethacrylate contains a large number of polar ester groups, and the surface energy is relatively high, and its bonding ability with metal coatings is very good.

[0003] However, polymethacrylate resins also have limitations. They have poor heat resistance and a relatively low heat deformation temperature. Long-term use in high-temperature environments can cause deformation, affecting the integrity of the surface metal coating. Furthermore, polymethacrylate resins have a low surface hardness, making them susceptible to minor scratches from impact or improper wiping, which can affect the aesthetics of decorative parts. To address these technical limitations, the present invention provides a process for preparing light-transmitting, metallic-textured plastic parts. Summary of the Invention

[0004] The object of the present invention is to provide a process for preparing a light-transmitting metal-textured plastic part, so as to solve the problems mentioned in the above background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A process for preparing a light-transmitting metal-textured plastic part comprises the following steps: In the first step, allyl alcohol, 1-(3,5-dichlorophenyl)-1H-pyrrole, potassium carbonate, and N,N-dimethylformamide are mixed in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor, the system temperature is raised to 80-100° C., and the reaction is stirred at 80-100° C. for 4-8 hours. After the reaction is completed, the reaction solution is poured into deionized water and extracted with dichloromethane. The organic phase is then dried and rotary evaporated to obtain a modified monomer; Allyl alcohol and 1-(3,5-dichlorophenyl)-1H-pyrrole are used as raw materials and the modified monomer is obtained through Williamson ether synthesis reaction.

[0006] In the second step, cesium tungsten bronze, silane coupling agent KH-550 and ethanol solution are mixed in a three-necked flask equipped with a condenser, a thermometer and a magnetic stirring rotor, the system temperature is raised to 40-60°C, and the reaction is stirred at 40-60°C for 4-12 hours. After the reaction is completed, the solid is filtered out and washed with anhydrous ethanol and deionized water in sequence, and then dried to obtain amide cesium tungsten bronze; The silane coupling agent KH-550 was grafted onto the surface of cesium tungsten bronze to obtain amino cesium tungsten bronze.

[0007] Step 3: Mix the amination cesium tungsten bronze, maleic anhydride, and N,N-dimethylformamide in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor, raise the system temperature to 90-110°C, and react at 90-110°C for 12-16 hours. After the reaction is completed, filter out the solid, wash it with anhydrous ethanol and deionized water in sequence, and then dry it to obtain the modified cesium tungsten bronze. Using amination of cesium tungsten bronze and maleic anhydride as raw materials, modified cesium tungsten bronze is obtained through imidization reaction.

[0008] Step 4: Add the first batch of methyl methacrylate, butyl methacrylate, isobornyl methacrylate, and initiator into a nitrogen-protected reactor, stir and mix evenly, and react at a temperature of 75 to 85° C. for 30 to 40 minutes for prepolymerization. Then, raise the system temperature to 85 to 95° C. and dropwise add a solution obtained by mixing the second batch of methyl methacrylate, the modified monomer, and the molecular weight regulator into the reactor for 60 to 90 minutes. After the dropwise addition is completed, continue the reaction at a temperature of 85 to 95° C. for 60 to 90 minutes. Finally, raise the system temperature to 135 to 145° C. and react at a temperature of 135 to 145° C. for 90 to 120 minutes to complete the final polymerization to obtain a modified polymethacrylate resin. Methyl methacrylate, butyl methacrylate, isobornyl methacrylate and modified monomer are used as polymerization monomers, a molecular weight regulator is added, and a modified polymethacrylate resin is obtained by bulk polymerization under the action of an initiator.

[0009] Step 5: Mix the modified polymethacrylate resin, polycarbonate, modified cesium tungsten bronze, antioxidant, ultraviolet absorber and lubricant, melt extrude and hot press mold through a twin-screw extruder, and then coat the surface to obtain a translucent metal-textured plastic part.

[0010] Furthermore, the particle size specification of the cesium tungsten bronze is 1 to 100 nm.

[0011] Furthermore, the ethanol solution is an ethanol aqueous solution with a volume fraction of 40 to 70%.

[0012] Furthermore, the initiator is at least one of benzoyl peroxide, azobisisobutyronitrile, di-tert-butyl peroxide, and tert-butyl perbenzoate.

[0013] Furthermore, the molecular weight regulator is tert-dodecyl mercaptan.

[0014] Furthermore, the antioxidant is at least one of antioxidant 1010, antioxidant 1035, and antioxidant 168.

[0015] Furthermore, the ultraviolet absorber is at least one of UV-234, UV-P, and UV-400.

[0016] Furthermore, the lubricant is at least one of pentaerythritol stearate and polyethylene wax.

[0017] Furthermore, the temperature condition of melt extrusion in the fifth step is 230-250°C.

[0018] Furthermore, the hot pressing molding in the fifth step is performed under the conditions of a temperature of 160-170° C. and a pressure of 10-15 MPa for curing for 5-10 minutes.

[0019] Furthermore, the mass ratio of allyl alcohol, 1-(3,5-dichlorophenyl)-1H-pyrrole, potassium carbonate and N,N-dimethylformamide used in the first step is 4.6-6.2:7.1-9.9:11-14:80-100.

[0020] Furthermore, the mass ratio of cesium tungsten bronze, silane coupling agent KH-550 and ethanol solution used in the second step is 3-4:1.8-2.4:60-80.

[0021] Furthermore, the mass ratio of the amidated cesium tungsten bronze, maleic anhydride, and N,N-dimethylformamide used in the third step is 3-4:3-4:60-80.

[0022] Furthermore, the mass ratio of the first batch of methyl methacrylate, butyl methacrylate, isobornyl methacrylate, initiator, the second batch of methyl methacrylate, modified monomer, and tert-dodecyl mercaptan used in the fourth step is 53-60: 3-5: 4-6: 0.14-0.22: 25-30: 6-8: 0.06-0.1.

[0023] Furthermore, the mass ratio of the modified polymethacrylate resin, polycarbonate, modified cesium tungsten bronze, antioxidant, ultraviolet absorber and lubricant used in the fifth step is 70-80:20-30:2.5-3.5:0.25-0.75:0.3-0.5:0.2-0.4.

[0024] The present invention has at least one of the following beneficial effects: 1) The modified monomer of the present invention has both a rigid aromatic ring structure and multiple reactive double bonds. When added after the prepolymerization stage, it can effectively increase the crosslinking density of the modified polymethacrylate. At the same time, it can also utilize the high rotational energy barrier of the aromatic ring structure to limit the freedom of movement of the modified polymethacrylate molecular segments, effectively inhibiting the relative slip and conformational rearrangement between molecular chains, thereby improving the heat deformation temperature and dimensional stability of the material. In addition, the highly cross-linked network structure combined with the steric hindrance effect of the aromatic ring itself jointly constructs a dense physical barrier, which can effectively hinder the penetration and diffusion of external solvent molecules into the interior of the polymer matrix, thereby enhancing the solvent resistance of the material.

[0025] 2) The modified polymethacrylate resin of the present invention has a rigid aromatic ring structure, which can utilize the π-π stacking effect between the aromatic rings to effectively promote the mutual attraction and entanglement of the modified polymethacrylate and polycarbonate molecular chains at the interface. In addition, the modified polymethacrylate has a higher heat deformation temperature, which makes the processing temperature window of the modified polymethacrylate and polycarbonate closer. During the melt blending process, the melt viscosity of the two phases will be more matched, thereby enabling more uniform dispersion, significantly improving the compatibility of polymethacrylate and polycarbonate, and thus improving the mechanical properties and heat deformation temperature of the final composite material.

[0026] 3) Cesium tungsten bronze has a strong absorption effect on ultraviolet light and infrared light, and the introduction of cesium tungsten bronze has little effect on the light transmittance of the composite material. However, the nanoparticles themselves have poor dispersibility and may agglomerate if directly added. The present invention modifies the cesium tungsten bronze and introduces an organic group with a maleimide structure on the surface of the modified cesium tungsten bronze, thereby effectively reducing the light scattering effect caused by particle agglomeration, thereby retaining the light transmittance of the composite material to the maximum extent; in addition, the maleimide structure (as a dienophile) on the surface of the modified cesium tungsten bronze can also undergo a reversible Diels-Alder reaction with the pyrrole structure (as a dienophile) in the composite material, significantly improving the bonding ability of the modified cesium tungsten bronze with the matrix resin. In addition, when the material is slightly damaged, it can also achieve self-repair through a reversible Diels-Alder reaction, effectively improving the integrity of the material structure and wear resistance.

[0027] 4) The infrared band in sunlight carries the most heat and has a strong thermal effect. Cesium tungsten bronze can effectively absorb the energy in infrared light and convert it into heat energy, thereby increasing the temperature of the area where it is located, thereby effectively increasing the reaction rate of the Diels-Alder reaction and accelerating the self-repair speed of the material under sunlight. DETAILED DESCRIPTION

[0028] The following is a clear and complete description of the technical solutions of the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection requested by this application.

[0029] The sources of all raw materials in the present invention are not particularly limited and can be purchased from the market or prepared according to conventional methods known to those skilled in the art. Example 1

[0030] A process for preparing a light-transmitting metal-textured plastic part comprises the following steps: The first step is to mix 4.6 parts of allyl alcohol, 7.1 parts of 1-(3,5-dichlorophenyl)-1H-pyrrole, 11 parts of potassium carbonate, and 80 parts of N,N-dimethylformamide in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor, raise the system temperature to 80°C, and stir the reaction at 80°C for 8 hours. After the reaction is completed, pour the reaction solution into deionized water and extract with dichloromethane. Then, dry the organic phase and rotary evaporate it to obtain the modified monomer.

[0031] Step 2: 3 parts of cesium tungsten bronze with a particle size of 1-100 nm, 1.8 parts of silane coupling agent KH-550, and 60 parts of 70% ethanol aqueous solution were mixed in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor. The system temperature was raised to 40°C, and the mixture was stirred at 40°C for 12 hours. After the reaction was completed, the solid was filtered out and washed with anhydrous ethanol and deionized water in sequence, and then dried to obtain amide cesium tungsten bronze.

[0032] Step 3: Mix 3 parts of amide cesium tungsten bronze, 3 parts of maleic anhydride, and 60 parts of N,N-dimethylformamide in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor. Raise the system temperature to 90°C and react at 90°C for 16 hours. After the reaction is completed, filter out the solid, wash it with anhydrous ethanol and deionized water in sequence, and then dry it to obtain modified cesium tungsten bronze.

[0033] The fourth step is to add the first batch of 53 parts of methyl methacrylate, 3 parts of butyl methacrylate, 4 parts of isobornyl methacrylate, 0.04 parts of azobisisobutyronitrile, and 0.1 parts of tert-butyl perbenzoate into a nitrogen-protected reactor, stir and mix evenly, and react at a temperature of 75°C for 40 minutes for prepolymerization. Then, the system temperature is raised to 85°C and a solution obtained by mixing 30 parts of methyl methacrylate from the second batch, 8 parts of modified monomer, and 0.1 parts of tert-dodecyl mercaptan is added dropwise to the reactor for 90 minutes. After the addition is completed, the reaction is continued at a temperature of 85°C for 90 minutes. Finally, the system temperature is raised to 135°C, and the reaction is carried out at a temperature of 135°C for 120 minutes to complete the final polymerization to obtain a modified polymethacrylate resin.

[0034] Step 5: Mix 70 parts of modified polymethacrylate resin, 30 parts of polycarbonate, 2.5 parts of modified cesium tungsten bronze, 0.25 parts of antioxidant 1010, 0.3 parts of UV-234, and 0.2 parts of pentaerythritol stearate by mass, melt extrude the mixture at a temperature of 230°C through a twin-screw extruder, and cure it at a temperature of 160°C and a pressure of 10 MPa for 10 minutes. Then, vacuum coat the surface to obtain a translucent metallic plastic part. Example 2

[0035] A process for preparing a light-transmitting metal-textured plastic part comprises the following steps: The first step is to mix 6.2 parts of allyl alcohol, 9.9 parts of 1-(3,5-dichlorophenyl)-1H-pyrrole, 14 parts of potassium carbonate, and 100 parts of N,N-dimethylformamide in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor, raise the system temperature to 100 ° C, and stir the reaction at 100 ° C for 4 hours. After the reaction is completed, pour the reaction solution into deionized water and extract with dichloromethane. Then, dry the organic phase and evaporate it to obtain the modified monomer.

[0036] Step 2: 4 parts of cesium tungsten bronze with a particle size of 1-100 nm, 2.4 parts of silane coupling agent KH-550, and 80 parts of 40% ethanol aqueous solution were mixed in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor. The system temperature was raised to 60°C, and the mixture was stirred at 60°C for 4 hours. After the reaction was completed, the solid was filtered out and washed with anhydrous ethanol and deionized water in sequence, and then dried to obtain amide cesium tungsten bronze.

[0037] Step 3: Mix 4 parts of amino cesium tungsten bronze, 4 parts of maleic anhydride, and 80 parts of N,N-dimethylformamide in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor, raise the system temperature to 110°C, and react at 110°C for 12 hours. After the reaction is completed, filter out the solid, wash it with anhydrous ethanol and deionized water in sequence, and then dry it to obtain modified cesium tungsten bronze.

[0038] The fourth step is to add the first batch of 60 parts of methyl methacrylate, 5 parts of butyl methacrylate, 6 parts of isobornyl methacrylate, 0.1 parts of benzoyl peroxide, and 0.12 parts of di-tert-butyl peroxide into a nitrogen-protected reactor, stir and mix evenly, and react at a temperature of 85°C for 30 minutes for prepolymerization. Then, the system temperature is raised to 95°C and a solution obtained by mixing 25 parts of methyl methacrylate from the second batch, 6 parts of modified monomers, and 0.06 parts of tert-dodecyl mercaptan is added dropwise to the reactor for 60 minutes. After the addition is completed, the reaction is continued at a temperature of 95°C for 60 minutes. Finally, the system temperature is raised to 145°C, and the reaction is carried out at a temperature of 145°C for 90 minutes to complete the final polymerization to obtain a modified polymethacrylate resin.

[0039] Step 5: Mix 80 parts of modified polymethacrylate resin, 20 parts of polycarbonate, 3.5 parts of modified cesium tungsten bronze, 0.5 parts of antioxidant 1010, 0.25 parts of antioxidant 168, 0.5 parts of UV-P, and 0.4 parts of pentaerythritol stearate, by mass, and melt-extrude through a twin-screw extruder at a temperature of 250°C and cure at a temperature of 170°C and a pressure of 15 MPa for 5 minutes. Then, vacuum coat the surface to obtain a translucent metallic plastic part. Example 3

[0040] A process for preparing a light-transmitting metal-textured plastic part comprises the following steps: The first step is to mix 5.4 parts of allyl alcohol, 8.5 parts of 1-(3,5-dichlorophenyl)-1H-pyrrole, 12.5 parts of potassium carbonate, and 90 parts of N,N-dimethylformamide in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor, raise the system temperature to 90°C, and stir the reaction at 90°C for 6 hours. After the reaction is completed, pour the reaction solution into deionized water and extract with dichloromethane. Then, dry the organic phase and evaporate it to obtain the modified monomer.

[0041] Step 2: 3.5 parts of cesium tungsten bronze with a particle size of 1-100 nm, 2.1 parts of silane coupling agent KH-550, and 70 parts of 55% ethanol aqueous solution were mixed in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor. The system temperature was raised to 50°C, and the mixture was stirred at 50°C for 8 hours. After the reaction was completed, the solid was filtered out and washed with anhydrous ethanol and deionized water in sequence, and then dried to obtain amide cesium tungsten bronze.

[0042] Step 3: Mix 3.5 parts of amide cesium tungsten bronze, 3.5 parts of maleic anhydride, and 70 parts of N,N-dimethylformamide in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor. Raise the system temperature to 100°C and react at 100°C for 14 hours. After the reaction is completed, filter out the solid, wash it with anhydrous ethanol and deionized water in sequence, and then dry it to obtain modified cesium tungsten bronze.

[0043] The fourth step, by mass, the first batch of 56.5 parts of methyl methacrylate, 4 parts of butyl methacrylate, 5 parts of isobornyl methacrylate, 0.08 parts of benzoyl peroxide, and 0.1 parts of tert-butyl perbenzoate were added to a nitrogen-protected reactor, stirred and mixed evenly, and reacted at a temperature of 80°C for 35 minutes for prepolymerization. After that, the system temperature was raised to 90°C and a solution obtained by mixing 27.5 parts of methyl methacrylate from the second batch, 7 parts of modified monomer, and 0.08 parts of tert-dodecyl mercaptan was added dropwise to the reactor. The addition time was 75 minutes. After the addition was completed, the reaction was continued at a temperature of 90°C for 75 minutes. Finally, the system temperature was raised to 140°C, and the reaction was carried out at a temperature of 140°C for 105 minutes to complete the final polymerization to obtain a modified polymethacrylate resin.

[0044] Step 5: Mix 75 parts of modified polymethacrylate resin, 25 parts of polycarbonate, 3 parts of modified cesium tungsten bronze, 0.3 parts of antioxidant 1035, 0.2 parts of antioxidant 168, 0.4 parts of UV-400, and 0.3 parts of polyethylene wax by mass, and then melt-extrude them through a twin-screw extruder at a temperature of 240°C and cure them at a temperature of 165°C and a pressure of 12.5 MPa for 7.5 minutes. Then, vacuum coat the surface to obtain a translucent metallic plastic part.

[0045] Comparative Example 1 The difference between this comparative example and Example 3 is that no modified monomer is prepared, and the amide cesium tungsten bronze is not modified. An equal amount of methyl methacrylate is used to replace the modified monomer during bulk polymerization.

[0046] A process for preparing a light-transmitting metal-textured plastic part comprises the following steps: The first step is to mix 3.5 parts of cesium tungsten bronze with a particle size of 1 to 100 nm, 2.1 parts of silane coupling agent KH-550, and 70 parts of 55% ethanol aqueous solution by mass in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor. The system temperature is raised to 50°C and stirred at 50°C for 8 hours. After the reaction is completed, the solid is filtered out and washed with anhydrous ethanol and deionized water in sequence and then dried to obtain amide cesium tungsten bronze.

[0047] The second step is to add the first batch of 56.5 parts of methyl methacrylate, 4 parts of butyl methacrylate, 5 parts of isobornyl methacrylate, 0.08 parts of benzoyl peroxide and 0.1 parts of tert-butyl perbenzoate into a nitrogen-protected reactor, stir and mix evenly, and react at a temperature of 80°C for 35 minutes for prepolymerization. Then, the system temperature is raised to 90°C and a solution obtained by mixing the second batch of 34.5 parts of methyl methacrylate and 0.08 parts of tert-dodecyl mercaptan is added dropwise to the reactor for 75 minutes. After the addition is completed, the reaction is continued at a temperature of 90°C for 75 minutes. Finally, the system temperature is raised to 140°C, and the reaction is carried out at a temperature of 140°C for 105 minutes to complete the final polymerization to obtain a modified polymethacrylate resin.

[0048] Step 3: Mix 75 parts of modified polymethacrylate resin, 25 parts of polycarbonate, 3 parts of cesium tungsten bronze amide, 0.3 parts of antioxidant 1035, 0.2 parts of antioxidant 168, 0.4 parts of UV-400, and 0.3 parts of polyethylene wax by mass, and melt-extrude the mixture through a twin-screw extruder at a temperature of 240°C and cure it at a temperature of 165°C and a pressure of 12.5 MPa for 7.5 minutes. Then, vacuum coat the surface to obtain a translucent metallic plastic part.

[0049] Comparative Example 2 The difference between this comparative example and Example 3 is that the amide cesium tungsten bronze is not modified.

[0050] A process for preparing a light-transmitting metal-textured plastic part comprises the following steps: The first step is to mix 5.4 parts of allyl alcohol, 8.5 parts of 1-(3,5-dichlorophenyl)-1H-pyrrole, 12.5 parts of potassium carbonate, and 90 parts of N,N-dimethylformamide in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor, raise the system temperature to 90°C, and stir the reaction at 90°C for 6 hours. After the reaction is completed, pour the reaction solution into deionized water and extract with dichloromethane. Then, dry the organic phase and evaporate it to obtain the modified monomer.

[0051] Step 2: 3.5 parts of cesium tungsten bronze with a particle size of 1-100 nm, 2.1 parts of silane coupling agent KH-550, and 70 parts of 55% ethanol aqueous solution were mixed in a three-necked flask equipped with a condenser, a thermometer, and a magnetic stirring rotor. The system temperature was raised to 50°C, and the mixture was stirred at 50°C for 8 hours. After the reaction was completed, the solid was filtered out and washed with anhydrous ethanol and deionized water in sequence, and then dried to obtain amide cesium tungsten bronze.

[0052] The third step is to add the first batch of 56.5 parts of methyl methacrylate, 4 parts of butyl methacrylate, 5 parts of isobornyl methacrylate, 0.08 parts of benzoyl peroxide and 0.1 parts of tert-butyl perbenzoate into a nitrogen-protected reactor, stir and mix evenly, and react at a temperature of 80°C for 35 minutes for prepolymerization. Then, the system temperature is raised to 90°C and a solution obtained by mixing 27.5 parts of methyl methacrylate, 7 parts of modified monomer and 0.08 parts of tert-dodecyl mercaptan from the second batch is added dropwise to the reactor for 75 minutes. After the addition is completed, the reaction is continued at a temperature of 90°C for 75 minutes. Finally, the system temperature is raised to 140°C and the reaction is carried out at a temperature of 140°C for 105 minutes to complete the final polymerization to obtain a modified polymethacrylate resin.

[0053] Step 4: Mix 75 parts of modified polymethacrylate resin, 25 parts of polycarbonate, 3 parts of cesium tungsten bronze amide, 0.3 parts of antioxidant 1035, 0.2 parts of antioxidant 168, 0.4 parts of UV-400, and 0.3 parts of polyethylene wax by mass, and then melt-extrude the mixture through a twin-screw extruder at a temperature of 240°C and cure it at a temperature of 165°C and a pressure of 12.5 MPa for 7.5 minutes. Then, vacuum coat the surface to obtain a translucent metallic plastic part.

[0054] Experimental example The light-transmitting metallic plastic parts in Examples 1 to 3 and Comparative Examples 1 to 2 were subjected to tensile strength tests, impact strength tests, wear resistance tests, heat resistance tests, and self-repairing performance tests, respectively. The test results are shown in Table 1. Tensile strength: Refer to the national standard GB / T 1040.1-2018 "Determination of tensile properties of plastics" to test the tensile strength of each component specimen; Impact strength: Refer to the national standard GB / T 1043.1-2008 "Determination of impact properties of simply supported beams of plastics" to test the notched impact strength of each component specimen; Wear resistance: Refer to the national standard GB / T 5478-2008 "Test method for rolling wear of plastics" to test the mass loss of each component specimen after 1000 revolutions; Heat resistance: Refer to the national standard GB / T 1633-2000 "Thermoplastics - Determination of Vicat Softening Temperature" to test the Vicat softening point of each component specimen; Self-healing performance test: A micro-nano scratch tester was used to create 100nm scratches on the surface of each component specimen. The specimen was then exposed to sunlight for 5 hours at a test temperature of 37°C. After the test, the self-healing performance of each component specimen was detected.

[0055] Table 1

[0056] As can be seen from Table 1, the light-transmitting metallic plastic parts in Examples 1 to 3 of the present invention have greatly improved tensile strength, impact strength, wear resistance, and heat resistance, and have self-repairing properties.

[0057] The above embodiments are intended only to facilitate understanding of the methods and core concepts of the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to be construed in the widest manner consistent with the principles and novel features disclosed herein.

Claims

1. A process for preparing a light-transmitting metal-textured plastic part, characterized in that: The following steps are involved: Using allyl alcohol and 1-(3,5-dichlorophenyl)-1H-pyrrole as raw materials, a modified monomer is obtained through a Williamson ether synthesis reaction; a silane coupling agent KH-550 is grafted onto the surface of cesium tungsten bronze to obtain amide cesium tungsten bronze, and then amide cesium tungsten bronze and maleic anhydride are used as raw materials to obtain modified cesium tungsten bronze through an imidization reaction; methyl methacrylate, butyl methacrylate, isobornyl methacrylate, and a modified monomer are used as polymerization monomers, and a molecular weight regulator is added. Under the action of an initiator, a modified polymethacrylate resin is obtained through bulk polymerization; the modified polymethacrylate resin, polycarbonate, modified cesium tungsten bronze, an antioxidant, an ultraviolet absorber, and a lubricant are mixed, melt-extruded, and hot-pressed, and then vacuum-coated on the surface to obtain a translucent metallic plastic part.

2. The process for preparing a light-transmitting metal-textured plastic part according to claim 1, characterized in that: The particle size of the cesium tungsten bronze is 1-100 nm.

3. The process for preparing a light-transmitting metal-textured plastic part according to claim 1, characterized in that: The initiator is at least one of benzoyl peroxide, azobisisobutyronitrile, di-tert-butyl peroxide, and tert-butyl perbenzoate.

4. The process for preparing a light-transmitting metal-textured plastic part according to claim 1, characterized in that: The molecular weight regulator is tert-dodecyl mercaptan.

5. The process for preparing a light-transmitting metal-textured plastic part according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 1010, antioxidant 1035, and antioxidant 168, and the ultraviolet absorber is at least one of UV-234, UV-P, and UV-400.

6. The process for preparing a light-transmitting metal-textured plastic part according to claim 1, characterized in that: The lubricant is at least one of pentaerythritol stearate and polyethylene wax.

7. The process for preparing a light-transmitting metal-textured plastic part according to claim 1, characterized in that: The temperature condition of the melt extrusion is 230-250° C., and the condition of the hot pressing molding is curing for 5-10 minutes under the conditions of temperature 160-170° C. and pressure 10-15 MPa.

8. The process for preparing a light-transmitting metal-textured plastic part according to claim 1, characterized in that: The mass ratio of allyl alcohol to 1-(3,5-dichlorophenyl)-1H-pyrrole is 4.6-6.2:7.1-9.9, the mass ratio of cesium tungsten bronze to silane coupling agent kh-550 is 3-4:1.8-2.4, the mass ratio of amide cesium tungsten bronze to maleic anhydride is 3-4:3-4, and the mass ratio of modified polymethacrylate resin, polycarbonate, modified cesium tungsten bronze, antioxidant, ultraviolet absorber, and lubricant is 70-80:20-30:2.5-3.5:0.25-0.75:0.3-0.5:0.2-0.

4.

9. The process for preparing a light-transmitting metal-textured plastic part according to claim 1, characterized in that: The bulk polymerization method is: The first batch of methyl methacrylate, butyl methacrylate, isobornyl methacrylate and initiator are added to a nitrogen-protected container, stirred and mixed evenly, and then reacted at a temperature of 75-85° C. for 30-40 minutes for prepolymerization. Then, the system temperature is raised to 85-95° C. and a solution obtained by mixing the second batch of methyl methacrylate, modified monomer and molecular weight regulator is added dropwise to the container for 60-90 minutes. After the addition is completed, the reaction is continued at a temperature of 85-95° C. for 60-90 minutes. Finally, the system temperature is raised to 135-145° C. and reacted at a temperature of 135-145° C. for 90-120 minutes to complete final polymerization to obtain a modified polymethacrylate resin.

10. The process for preparing a light-transmitting metal-textured plastic part according to claim 9, characterized in that: The mass ratio of the first batch of methyl methacrylate, butyl methacrylate, isobornyl methacrylate, initiator, the second batch of methyl methacrylate, modified monomer and tert-dodecyl mercaptan is 53-60: 3-5: 4-6: 0.14-0.22: 25-30: 6-8: 0.06-0.1.

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