Chemical-resistant photodiffusion polycarbonate material for CL process and preparation method of chemical-resistant photodiffusion polycarbonate material

Abstract

The invention belongs to the technical field of lampshade materials of automobile atmosphere lamps, and discloses a chemical-resistant photodiffusion polycarbonate material for a CL process and a preparation method of the chemical-resistant photodiffusion polycarbonate material. Comprising the following raw materials in parts by weight: 75-95 parts of polycarbonate, 30-50 parts of bio-based polycarbonate, 1-5 parts of an acrylate and polycarbonate copolymer, 0.1-1 part of an ester exchange inhibitor, 0.1-0.5 part of an antioxidant, 0.1-0.5 part of a lubricant, 0.5-1.5 parts of a light diffusion agent, 1-3 parts of nano silicon dioxide and 0.5-2 parts of benzophenone. By adding the acrylate and polycarbonate copolymer, the photodiffusion polycarbonate material can effectively resist corrosion of chemical solvents, so that the anti-cracking performance of the material in a chemical environment is enhanced, meanwhile, bio-based polycarbonate has relatively good chemical stability in a molecular structure, and the photodiffusion performance of the material is improved. And the chemical resistance of the light diffusion polycarbonate material is further enhanced through the addition of the light diffusion polycarbonate material, so that the material is slightly influenced when being processed by a CL process, and the product quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automotive atmosphere lampshade materials, and in particular relates to a chemical-resistant light-diffusing polycarbonate material for CL process and a preparation method thereof. Background Art

[0002] Polycarbonate is a high molecular polymer containing carbonate groups in the molecular chain. It can be divided into various types such as aliphatic, aromatic, aliphatic-aromatic, etc. according to the structure of the ester group. Light-diffusing polycarbonate material is a special polycarbonate raw material with excellent optical properties.

[0003] In the automotive industry, light-diffusing polycarbonate has excellent optical properties. The ambient light lampshade made of light-diffusing polycarbonate material can ensure that the light source in the lampshade is evenly distributed, reduce light spots and glare, and provide the driver with a clear and comfortable lighting environment. In addition, the density of polycarbonate is relatively low, which reduces the overall weight of the lampshade, helps reduce the energy consumption of the car and improve fuel efficiency, and can also reduce the weight of the vehicle and improve driving flexibility and controllability.

[0004] However, when the CL process (Spray Coating-Laser) is used to process lampshade products, the light-diffusing polycarbonate material is easily affected by various chemicals, such as solvents, acids and alkalis. These chemicals can cause corrosion or cracking on the surface of the material, thereby affecting the appearance and performance of the product. There are many chemical-resistant polycarbonate materials on the market, but there are few light-diffusing polycarbonate materials that can be used in the CL process. This is because the molecular structure of chemical-resistant polycarbonate is usually relatively stable and it is difficult to effectively interact with the light diffuser. On the other hand, during the modification process, the chemical-resistant polycarbonate is prone to yellowing, which affects the appearance and light transmittance of the product. Therefore, a light-diffusing polycarbonate material that is chemical-resistant and can be used in the CL process is needed to solve this problem. Summary of the invention

[0005] The object of the present invention is to provide a chemical-resistant light-diffusing polycarbonate material for CL process and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical scheme: a chemical-resistant light-diffusion polycarbonate material for CL process and a preparation method thereof, wherein the chemical-resistant light-diffusion polycarbonate material comprises the following raw materials in parts by weight: 75-95 polycarbonate, 30-50 bio-based polycarbonate, 1-5 acrylate and polycarbonate copolymer, 0.1-1 ester exchange inhibitor, 0.1-0.5 antioxidant and 0.1-0.5 lubricant, 0.5-1.5 light diffuser, 1-3 nano-silica and 0.5-2 benzophenone.

[0007] Preferably, the preparation steps of the chemical-resistant light-diffusion polycarbonate material are:

[0008] A1, first weigh the required polycarbonate, bio-based polycarbonate, acrylate and polycarbonate copolymer, transesterification inhibitor, antioxidant, lubricant, light diffuser, nano-silica and benzophenone to ensure that the mass percentage of each component meets the formula requirements;

[0009] A2, putting polycarbonate and bio-based polycarbonate into a mixer, and starting the mixer to rotate at a low speed to mix them evenly;

[0010] A3, during the mixing process, the acrylate and polycarbonate copolymer, the transesterification inhibitor, the antioxidant and the lubricant, the light diffuser, the nano-silica and the benzophenone are sequentially added;

[0011] A4, sending the mixed materials into a twin-screw extruder for melt blending, and the extruder is selected with an aspect ratio of 32;

[0012] A5, the finished material is extruded and granulated through a twin-screw extruder to complete the preparation.

[0013] Preferably, the polycarbonate is conventional commercially available polycarbonate with a density of 1.192 g / cm3 and a melt index (300°C*1.2 kg) of 20 g / 10 min.

[0014] Preferably, the bio-based polycarbonate is DURABIO D7340R type, which enhances the environmental friendliness of the material, improves biocompatibility, and simultaneously increases the toughness and impact resistance of the material. The copolymer of acrylate and polycarbonate is responsible for optical properties, improves light diffusion effects, and enhances the toughness and chemical resistance of the material.

[0015] Preferably, the component of the transesterification inhibitor is sodium dihydrogen phosphate, which is responsible for inhibiting the degradation of polycarbonate during high-temperature processing, extending the service life of the material and maintaining its physical properties.

[0016] Preferably, the nano-silicon dioxide is Aerosil 200, and the benzophenone is UV-531.

[0017] Preferably, when a sample test piece of the chemical-resistant light-diffusing polycarbonate material is immersed in a xylene solution for 60 seconds, cracks on the surface of the test piece are slight, and the yellow wave index of the material does not change significantly, which is consistent with conventional light-diffusing polycarbonate.

[0018] Preferably, in A4, the setting values ​​of the extruder are: setting the melt temperature to 280°C, the screw speed to 600 rpm, and the extrusion temperature to 260°C.

[0019] The beneficial effects of the present invention are as follows:

[0020] 1. The present invention adds a copolymer of acrylate and polycarbonate so that the light-diffusing polycarbonate material also has the chemical stability and low hydrophilicity of the copolymer, and can effectively resist the erosion of chemical solvents, thereby enhancing the crack resistance of the material in a chemical environment. At the same time, bio-based polycarbonate has good chemical stability in its molecular structure and can enhance the chemical resistance of the main polymer. Its addition further enhances the chemical resistance of the light-diffusing polycarbonate material, so that the material is less affected when processed by the CL process, thereby improving the product quality.

[0021] 2. The present invention adds nano-silicon dioxide so that its high surface area and strong chemical stability can be effectively dispersed in the polycarbonate matrix, thereby increasing the strength and toughness of the material, improving the quality of the product, and making it less likely to break or damage during processing. Furthermore, by adding benzophenone, ultraviolet rays are absorbed to prevent direct damage to the polycarbonate chain by ultraviolet rays, reduce yellowing and physical property degradation, thereby increasing the service life of the product and improving consumer satisfaction.

[0022] 3. After the product is produced, the present invention ensures the quality of the materials through quality inspection. When defective products are found, the production steps are promptly stopped to review to prevent economic losses. The chemical resistance of the material samples is tested by xylene solution to ensure product quality control. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a diagram showing the steps for preparing the chemical-resistant light-diffusing polycarbonate material of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0025] like Figure 1As shown, an embodiment of the present invention provides a chemical-resistant light-diffusion polycarbonate material for CL process and a preparation method thereof, wherein the chemical-resistant light-diffusion polycarbonate material comprises the following raw materials in parts by weight: 75-95 polycarbonate, 30-50 bio-based polycarbonate, 1-5 acrylate and polycarbonate copolymer, 0.1-1 ester exchange inhibitor, 0.1-0.5 antioxidant and 0.1-0.5 lubricant, 0.5-1.5 light diffuser, 1-3 nano-silica and 0.5-2 benzophenone.

[0026] By adding acrylate and polycarbonate copolymers, the light-diffusing polycarbonate material also has the chemical stability and low hydrophilicity of the copolymer, and can effectively resist the erosion of chemical solvents, thereby enhancing the material's crack resistance in a chemical environment. At the same time, bio-based polycarbonate has good chemical stability in its molecular structure and can enhance the chemical resistance of the main polymer. Its addition further enhances the chemical resistance of the light-diffusing polycarbonate material, so that the material is less affected when processed through the CL process, thereby improving product quality.

[0027] The preparation steps of the chemical-resistant light-diffusion polycarbonate material are as follows:

[0028] A1, first weigh the required polycarbonate, bio-based polycarbonate, acrylate and polycarbonate copolymer, transesterification inhibitor, antioxidant, lubricant, light diffuser, nano-silica and benzophenone to ensure that the mass percentage of each component meets the formula requirements;

[0029] A2, putting polycarbonate and bio-based polycarbonate into a mixer, and starting the mixer to rotate at a low speed to mix them evenly;

[0030] A3, during the mixing process, the acrylate and polycarbonate copolymer, the transesterification inhibitor, the antioxidant and the lubricant, the light diffuser, the nano-silica and the benzophenone are sequentially added;

[0031] A4, sending the mixed materials into a twin-screw extruder for melt blending, and the extruder is selected with an aspect ratio of 32;

[0032] A5, the finished material is extruded and granulated through a twin-screw extruder to complete the preparation.

[0033] The polycarbonate is conventional commercially available polycarbonate with a density of 1.192 g / cm3 and a melt index (300°C*1.2 kg) of 20 g / 10 min, such as PC 02-20; PC CH-8225; PC CH210-0-L.

[0034] Polycarbonate, as the main component, is responsible for providing basic mechanical strength and transparency, and has excellent impact resistance and thermal stability.

[0035] Among them, the bio-based polycarbonate uses Mitsubishi Chemical DURABIO D7340R, which enhances the environmental friendliness of the material, improves biocompatibility, and at the same time improves the toughness and impact resistance of the material. The copolymer of acrylate and polycarbonate (MGC) is produced by Shanghai Langdu New Materials Co., Ltd. and is responsible for optical properties, improves light diffusion effects, and enhances the toughness and chemical resistance of the material.

[0036] The component of the ester exchange inhibitor is sodium dihydrogen phosphate (sodium dihydrogen phosphate from Shandong Guohua Chemical Co., Ltd.), which is responsible for inhibiting the degradation of polycarbonate during high-temperature processing, extending the service life of the material and maintaining its physical properties.

[0037] Antioxidant 1076 and antioxidant 168 are both commercially available products, and the antioxidant 1076 and antioxidant 168 from Tianjin Lianlong are used. Light diffuser MBX-5 is also a commercially available product, and the light diffuser MBX-5 from Sekisui, Japan is used.

[0038] Among them, antioxidants are responsible for preventing oxidation reactions of materials during processing, protecting polymer chains and avoiding performance degradation, while light diffusers are responsible for enhancing the light diffusion properties of materials, improving the uniformity of light, and improving visual effects, making them suitable for lighting applications.

[0039] Wherein, the nano silicon dioxide is selected from Aerosil 200 type, and the benzophenone is selected from UV-531 type.

[0040] By adding nano-silica, its high surface area and strong chemical stability can be effectively dispersed in the polycarbonate matrix, increasing the strength and toughness of the material, improving the quality of the product, and making it less likely to break or damage during processing. By adding benzophenone, ultraviolet rays are absorbed to prevent direct damage to the polycarbonate chain, reducing yellowing and degradation of physical properties, thereby increasing the service life of the product and improving consumer satisfaction.

[0041] Wherein, a sample test piece of the chemical-resistant light-diffusing polycarbonate material was immersed in a xylene solution for 60 seconds, and cracks on the surface of the test piece were slight, and the yellow wave index of the material did not change significantly, which was consistent with conventional light-diffusing polycarbonate.

[0042] After the product is produced, quality inspection is carried out to ensure the quality of the materials. When defective products are found, the production steps should be stopped in time to review to prevent economic losses. The chemical resistance of the material samples is tested by xylene solution to ensure product quality control.

[0043] Among them, in the A4, the setting values ​​of the extruder are: setting the melt temperature to 280°C, the screw speed to 600rpm, and the extrusion temperature to 260°C.

[0044] By setting the twin-screw extruder, the light-diffusing polycarbonate material can achieve the best optical performance after preparation, ensuring its light transmittance.

[0045] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A chemical-resistant light-diffusing polycarbonate material for CL process, characterized in that: The chemical-resistant light-diffusing polycarbonate material comprises the following raw materials in parts by weight: 75-95 polycarbonate, 30-50 bio-based polycarbonate, 1-5 acrylate and polycarbonate copolymer, 0.1-1 ester exchange inhibitor, 0.1-0.5 antioxidant and 0.1-0.5 lubricant, 0.5-1.5 light diffuser, 1-3 nano silicon dioxide and 0.5-2 benzophenone.

2. The method for preparing a chemical-resistant light-diffusion polycarbonate material for CL process according to claim 1, characterized in that: The preparation steps of the chemical-resistant light-diffusion polycarbonate material are as follows: A1, first weigh the required polycarbonate, bio-based polycarbonate, acrylate and polycarbonate copolymer, transesterification inhibitor, antioxidant, lubricant, light diffuser, nano-silica and benzophenone to ensure that the mass percentage of each component meets the formula requirements; A2, putting polycarbonate and bio-based polycarbonate into a mixer, and starting the mixer to rotate at a low speed to mix them evenly; A3, during the mixing process, the acrylate and polycarbonate copolymer, the transesterification inhibitor, the antioxidant and the lubricant, the light diffuser, the nano-silica and the benzophenone are sequentially added; A4, sending the mixed materials into a twin-screw extruder for melt blending, and the extruder is selected with an aspect ratio of 32; A5, the finished material is extruded and granulated through a twin-screw extruder to complete the preparation.

3. The chemical-resistant light-diffusing polycarbonate material for CL process according to claim 1, characterized in that: The polycarbonate is conventional commercially available polycarbonate with a density of 1.192 g / cm3 and a melt index (300°C*1.2 kg) of 20 g / 10 min.

4. The chemical-resistant light-diffusing polycarbonate material for CL process according to claim 1, characterized in that: The bio-based polycarbonate is DURABIO D7340R, which enhances the environmental friendliness of the material, improves biocompatibility, and at the same time increases the toughness and impact resistance of the material. The copolymer of acrylate and polycarbonate is responsible for optical properties, improves light diffusion effects, and enhances the toughness and chemical resistance of the material.

5. The chemical-resistant light-diffusing polycarbonate material for CL process according to claim 1, characterized in that: The component of the transesterification inhibitor is sodium dihydrogen phosphate, which is responsible for inhibiting the degradation of polycarbonate during high-temperature processing, extending the service life of the material and maintaining its physical properties.

6. The chemical-resistant light-diffusing polycarbonate material for CL process according to claim 1, characterized in that: The nano silicon dioxide is selected from Aerosil 200 type, and the benzophenone is selected from UV-531 type.

7. The chemical-resistant light-diffusing polycarbonate material for CL process according to claim 1, characterized in that: The sample test piece of the chemical-resistant light-diffusing polycarbonate material was immersed in a xylene solution for 60 seconds. The crack phenomenon on the surface of the test piece was slight, and the yellow wave index of the material did not change significantly, which was consistent with that of conventional light-diffusing polycarbonate.

8. The method for preparing a chemical-resistant light-diffusion polycarbonate material for CL process according to claim 2, characterized in that: In the A4, the setting values ​​of the extruder are: the melt temperature is set to 280°C, the screw speed is set to 600 rpm, and the extrusion temperature is set to 260°C.

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