Preparation method of automobile tail door trim

Abstract

The invention provides a preparation method of an automobile tail door trim, and belongs to the field of application of automobile materials.The preparation method of the automobile tail door trim specifically comprises the following steps that a raw material plate or a felt material is baked; a surface layer or a fabric is adopted to be hung on the raw material plate or the felt material baked in the step S1; and carrying out mold pressing-injection molding-punching treatment by adopting a one-step method to obtain the tail door trim. Compared with the prior art, the characteristic structure is formed on the back face in an injection molding mode, the weight can be obviously reduced by 30% or above, and the one-step manufacturing process is adopted, the step that a large amount of glue needs to be used in a traditional process is omitted, and the cost is reduced. The emission of odor and VOC (Volatile Organic Compounds) is obviously reduced, and the environmental protection performance of the product is improved; and the strength of the automobile tail door trim can be flexibly adjusted by adjusting the gram weight of the fiberboard, the formula design and the back injection molding characteristic design.

Description

Technical Field

[0001] The invention belongs to the field of automobile material application, and in particular relates to a method for preparing an automobile tailgate trim panel. Background Art

[0002] As the automotive industry pays more and more attention to energy conservation, emission reduction and environmental protection, lightweight and environmentally friendly production of automobile tailgate trims has become an important research direction. Traditional automobile tailgate trims are mainly made by injection molding technology, using plastic or composite materials. Although they have certain mechanical properties, they have obvious deficiencies in weight, environmental performance and sound absorption performance. Specifically, they are manifested in the following aspects:

[0003] 1. Poor environmental protection: Use of glue: In traditional processes, a large amount of glue is needed to fix accessories (such as reinforcement bases, mounting brackets, etc.) to the tailgate trim. These glues release harmful gases such as VOCs (volatile organic compounds) during production and use, which cause serious harm to human health and the environment. Especially when the space inside the car is small, the accumulation of VOCs will have an adverse effect on the health of drivers and passengers.

[0004] Material selection: The materials used in traditional molded parts often contain more chemical additives, which will also release harmful substances during the production and use process, further exacerbating environmental problems.

[0005] 2. Complex process: Multi-step process: The traditional process requires the fabric and fiberboard to be molded first, and then the accessories are fixed to the trim by gluing. This process involves multiple steps, including heating, molding, cooling, gluing, curing, etc., which is complicated and has low production efficiency.

[0006] Manual dependence: Multiple steps of operation require a lot of manual participation, which increases production costs and also increases the possibility of human errors, affecting the stability of product quality.

[0007] 3. Insufficient strength: Structural design: The structural design of traditional molded parts is often relatively simple, and cannot provide sufficient strength and toughness while ensuring lightness. Especially in the case of impact and collision when closing the door, traditional decorative panels may crack or fall off, affecting safety and lifespan.

[0008] Glue performance: The glue used may lose its adhesion in high temperature, low temperature and humid environment, causing the accessories to loosen or fall off, thereby generating abnormal noise or further affecting the strength and stability of the panel. Summary of the invention

[0009] To solve the above-mentioned existing technical problems, the present invention provides a preparation method for an automobile tailgate trim panel that is lightweight, environmentally friendly, has good sound absorption performance and adjustable strength, and solves the problems of large weight, poor environmental performance, poor sound absorption performance and difficult strength adjustment in the prior art.

[0010] The preparation method for the automobile tailgate trim panel provided by the present invention specifically includes the following steps: S1. Bake the raw material board or felt material. S2. Use the skin or fabric to hang the material with the raw material board or felt material after baking in step S1. S3. Obtain the tailgate trim panel after compression molding - injection molding - punching using the one-step method.

[0011] Compared with the prior art, the present invention has the following advantages: The automobile tailgate trim panel of the present invention uses a lightweight raw material board or felt material and injects characteristic structures on the back, which can significantly reduce the weight, and the weight reduction can reach more than 30%. This is of great significance for improving fuel efficiency, reducing emissions and increasing the cruising range of electric vehicles. The one-step manufacturing process Compression backing injection (CBI) is adopted, which omits the steps that require a large amount of glue in the traditional process, significantly reduces the emission of VOC (volatile organic compounds), and improves the environmental performance of the product; the strength of the automobile tailgate trim panel can also be flexibly adjusted by adjusting the gram weight of the fiber board, formula design and the design of the back injection characteristics. This adjustable strength design enables the trim panel to adapt to different usage requirements, provides sufficient strength and toughness, and ensures the use safety and life in various environments.

[0012] In some embodiments, in step S1, the temperature of the baking treatment is 160 - 270 °C, and the time of the baking treatment is 135 - 255 s.

[0013] Compared with the prior art, the advantages of the present invention adopting the above parameters are as follows: within this temperature range, the raw material board or felt material can reach the best softening state, which is beneficial to subsequent compression molding and injection molding operations. The appropriate temperature can ensure that the material is evenly heated during the baking process, avoid local overheating or overcooling, and ensure the uniform softening of the material. The moderate baking time can ensure that the material is fully softened during the baking process, and at the same time avoid excessive degradation or carbonization of the material caused by too long baking time, and maintain the odor and physical properties of the material.

[0014] In some embodiments, the raw material board or felt material is doped with fibers and biological filtration powder, and the fibers include first fibers and second fibers. The first fibers are adhesive fibers and / or PP fibers, and the second fibers are selected from one or more of PET fibers, PA fibers, glass fibers, hemp fibers, bamboo and wood fibers, and coconut coir fibers. The mass percentage content of the first fibers in the fibers is 10%-80%, and the balance is the second fibers.

[0015] Compared with the prior art, the advantages of the present invention adopting the above parameters are as follows: Different fibers have different structural and mechanical properties. Through reasonable selection and combination, the mechanical properties of the raw material board or felt material can be significantly enhanced. Among them, PP fibers: have good chemical resistance and wear resistance and are suitable for various environments; PET fibers: have high strength and good elasticity and can improve the tensile strength and toughness of the material; PA fibers: have excellent wear resistance and heat resistance and are suitable for high-temperature environments; glass fibers: have extremely high strength and rigidity and can significantly improve the mechanical properties of the material; hemp fibers: have good natural toughness and hygroscopicity and can improve the flexibility and comfort of the material; bamboo and wood fibers: have good hygroscopicity and air permeability and can improve the comfort and environmental friendliness of the material; coconut coir fibers are very tough, have good tensile strength, can absorb about twice their own weight of water, and maintain good air permeability; and adhesive fibers can enhance the overall strength and toughness of the material. By improving the bonding between fibers, the composite material or textile performs better when stressed. By optimizing the coherence and stability of the internal structure, adhesive fibers help to extend the service life of the product and reduce damage caused by wear or environmental factors.

[0016] In some embodiments, the raw material board or felt material is prepared by the following method: After sequentially sprinkling fibers and biological filtration powder on the raw material board or felt material, it is obtained by compounding with a compounding machine.

[0017] In some embodiments, the raw material composition of the biological filtration powder is: activated carbon, zeolite, diatomite, chitosan and titanium dioxide, and the mass ratio of the activated carbon, zeolite, diatomite, chitosan and photocatalyst is (88-120):1:1:1:1.

[0018] Compared with the prior art, the advantages of the present invention adopting the above parameters are as follows: Activated carbon has an extremely high specific surface area and a rich pore structure, and can effectively adsorb harmful gases and odors in the air, such as VOC, formaldehyde, etc., and occupies a dominant position in the biological filter powder (88 - 120 parts), ensuring its strong adsorption capacity; zeolite has good ion exchange capacity and adsorption performance, can adsorb moisture and harmful gases in the air, and acts synergistically with activated carbon to further improve the adsorption effect; diatomite has a porous structure, can adsorb fine particles and harmful substances in the air, and acts together with activated carbon and zeolite to enhance the overall adsorption performance; titanium dioxide is an efficient photocatalyst, and under light conditions, it can decompose harmful substances adsorbed on the surface, such as VOC, bacteria, etc. Adding 1 part of titanium dioxide in the biological filter powder can significantly improve the self-cleaning ability and antibacterial performance of the material; chitosan is a natural polysaccharide, has good biodegradability and biocompatibility, and can promote the environmental protection performance of the material. The addition of chitosan can improve the biodegradability of the biological filter powder and reduce the impact on the environment.

[0019] In some embodiments, the specific steps of step S3 are as follows: The raw material board or felt material hung in step S2 is compounded with the skin or fabric by compression molding to obtain the structure of the designed automobile tailgate trim panel, then the characteristic structure is injection molded on the back to obtain the finished skeleton, and finally the finished skeleton is subjected to blanking treatment to remove the excess corner materials and then assembled to obtain the finished product.

[0020] Compared with the prior art, compression molding can ensure the tight combination of the raw material board and the skin or fabric, improve the overall performance of the composite material. The pressure and temperature applied during the compression molding process can make the adhesive fully infiltrate to ensure the bonding strength. Injection molding treatment on the back can further enhance the structural strength of the trim panel, provide necessary support and fixing points, and ensure that no deformation or damage occurs during use. One-step compounding and automated production simplify the production process, improve production efficiency and consistency.

[0021] In some embodiments, the clamping force of the compression molding is 330 - 360T, and the clamping time is 80 - 120s.

[0022] Compared with the prior art, the advantages of the present invention adopting the above parameters are as follows: Within this clamping force range, the mold can be prevented from being opened by the pressure generated during injection molding. An appropriate clamping force can prevent the occurrence of glue overflow during mold injection molding and the generation of a large amount of flash.

[0023] In some embodiments, in step S3, the parameters of injection molding are as follows: the injection time is 5 - 15s, and the temperature is 200 - 250°C.

[0024] Compared with the prior art, the advantages of the present invention adopting the above parameters are as follows: A moderate injection time can ensure that the material is fully filled in the mold cavity, avoiding incomplete filling due to too short time, or overflowing, piercing the board / felt material, or leaving imprints on its surface due to too long time. An injection time of 5 - 15 seconds can balance the filling efficiency and the product appearance; meanwhile, within this temperature range, the material can reach the best fluidity, ensuring full filling of the mold in a short time. The appropriate temperature can promote the rapid curing of the material and improve the production efficiency.

[0025] In addition, the present invention uses a horizontal injection molding machine for injection molding, and the advantages are as follows: Good stability: The horizontal design helps to improve the stability during the operation of the machine, especially suitable for the production of large-sized products; Easy to integrate with automation: The horizontal injection molding machine is easier to combine with the automated production line to improve the production efficiency and product quality; Convenient for mold installation and maintenance: The horizontal design makes the loading and unloading of the mold simpler and facilitates daily maintenance.

[0026] In some embodiments, in the step S2, the material of the skin is selected from one of TPO, PU, PVC, ultra-fine fiber, and genuine leather; the material of the fabric is selected from one of suede-like fabric, knitted fabric, fleece blanket surface, tufted blanket surface, and non-woven fabric.

[0027] Compared with the prior art, the advantages of the present invention adopting the above materials are as follows: The selection of various materials can meet the needs and preferences of different customers, providing diversified interior styles. Different materials have different touches and appearances, which can enhance the comfort and high-class sense of the interior. All kinds of materials have good abrasion resistance, tear resistance, and weather resistance, ensuring the long-term service performance of the interior. Some materials (such as TPO, ultra-fine fiber) have the characteristics of environmental protection and recyclability, meeting the requirements of sustainable development in modern manufacturing.

[0028] Compared with the prior art, the tailgate trim of the present invention can also be applied to the ceiling, A / B / C trim, center console trim, door sill trim, or trunk trim. Detailed Embodiments

[0029] To make the above objects, features, and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below. It should be noted that the following embodiments are only used to illustrate the implementation methods and typical parameters of the present invention, and are not used to limit the parameter range described in the present invention. The reasonable changes derived therefrom are still within the protection scope of the claims of the present invention.

[0030] It should be noted that the endpoints and any values within the ranges disclosed in this document are not limited to the exact ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in this document.

[0031] Unless otherwise defined, all terms, symbols, and other scientific terms used in this document are intended to have the same meaning as commonly understood by those skilled in the art to which this invention pertains. In some cases, for the purpose of clarification or convenient reference, terms with conventional understood meanings are defined in this document, and such definitions in this document should not be construed as indicating a significant difference from the conventional understanding in the art. The technical methods described or cited in this document are generally well understood by those skilled in the art and are adopted by conventional methods. Unless otherwise stated, the use of commercially available kits, reagents, and instruments follows the protocols and parameters given by the manufacturers.

[0032] The technical effects of the present invention are described below in conjunction with specific embodiments.

[0033] Example 1 This example provides an automobile tailgate trim panel, which is prepared by the following method: S1. Bake the raw material board at a temperature of 180 °C for 225 s; the raw material board is doped with fibers and biological filtration powder, and the fibers are PP fibers and PET fibers; the raw material board is prepared by the following method: after sequentially sprinkling fibers and biological filtration powder on the raw material board, it is compounded by a compounding machine; the raw material composition of the biological filtration powder is: activated carbon, zeolite, diatomaceous earth, chitosan, and titanium dioxide, and the mass ratio of activated carbon, zeolite, diatomaceous earth, chitosan, and photocatalyst is 88:1:1:1:1; S2. Use molding to compound the raw material board after the baking treatment in step S1 with the skin to obtain the structure of the designed automobile tailgate trim panel, then inject molding the characteristic structure on the back to obtain the finished skeleton, and finally perform punching on the finished skeleton to remove the excess scraps and then assemble to obtain the finished product. The clamping force of the molding is 330 T, and the clamping time is 80 s. The injection molding parameters are as follows: the injection molding time is 7 s, and the temperature is 250 °C; the material of the skin is TPO.

[0034] Example 2 This example provides an automobile tailgate trim panel, which is prepared by the following method: S1. Bake the felt material at a temperature of 200 °C for 195 s. Fibers and biological filter powder are doped in the felt material, and the fibers are bonding fibers and PA fibers. The felt material is obtained by the following method: sprinkle the fibers and biological filter powder on the felt material in sequence, and then compound them by a compounding machine. The raw material composition of the biological filter powder is: activated carbon, zeolite, diatomite, chitosan and titanium dioxide, and the mass ratio of the activated carbon, zeolite, diatomite, chitosan and photocatalyst is 95:1:1:1:1; S2. Use molding to compound the raw material board or felt material after the baking treatment in step S1 with the skin to obtain the structure of the designed automobile tailgate trim panel, then inject the characteristic structure on the back to obtain the finished skeleton, and finally perform punching on the finished skeleton to remove the excess scraps and then assemble to obtain the finished product. The clamping force of the molding is 340 T, and the clamping time is 90 s. The injection parameters are as follows: the injection time is 8 s, and the temperature is 240 °C. The material of the skin is suede-like.

[0035] Example 3 This example provides an automobile tailgate trim panel, which is prepared by the following method: S1. Bake the raw material board at a temperature of 230 °C for 165 s. Fibers and biological filter powder are doped in the raw material board, and the fibers are bonding fibers and bamboo and wood fibers. The raw material board is obtained by the following method: sprinkle the fibers and biological filter powder on the raw material board in sequence, and then compound them by a compounding machine. The raw material composition of the biological filter powder is: activated carbon, zeolite, diatomite, chitosan and titanium dioxide, and the mass ratio of the activated carbon, zeolite, diatomite, chitosan and photocatalyst is 110:1:1:1:1; S2. Use molding to compound the raw material board or felt material after the baking treatment in step S1 with the skin to obtain the structure of the designed automobile tailgate trim panel, then inject the characteristic structure on the back to obtain the finished skeleton, and finally perform punching on the finished skeleton to remove the excess scraps and then assemble to obtain the finished product. The clamping force of the molding is 345 T, and the clamping time is 100 s. The injection parameter is as follows: the injection temperature is 230 °C. The material of the skin is PU.

[0036] Example 4 This example provides an automobile tailgate trim panel, which is prepared by the following method: S1. Bake the felt material at a temperature of 250 °C for 150 s. Fibers and biological filtration powder are doped in the felt material, and the fibers are PP fibers and glass fibers. The raw material board or felt material is obtained by the following method: after sequentially sprinkling fibers and biological filtration powder on the felt material, it is compounded by a compounding machine. The raw material composition of the biological filtration powder is: activated carbon, zeolite, diatomite, chitosan and titanium dioxide, and the mass ratio of the activated carbon, zeolite, diatomite, chitosan and photocatalyst is 115:1:1:1:1; S2. Use molding to compound the raw material board or felt material after baking in step S1 with the fabric to obtain the structure of the designed automobile tailgate trim panel, then injection mold the characteristic structure on the back to obtain the finished skeleton, and finally perform punching on the finished skeleton to remove the excess scraps and then assemble to obtain the finished product. The clamping force of the molding is 330 - 360 T, and the clamping time is 100 s. The injection molding parameters are as follows: injection time is 10 s, and the temperature is 220 °C. The material of the fabric is tufted blanket surface.

[0037] Example 5 This example provides an automobile tailgate trim panel, which is prepared by the following method: S1. Bake the raw material board at a temperature of 270 °C for 135 s. Fibers and biological filtration powder are doped in the raw material board, and the fibers are PP fibers and PA fibers. The raw material board is obtained by the following method: after sequentially sprinkling fibers and biological filtration powder on the raw material board, it is compounded by a compounding machine. The raw material composition of the biological filtration powder is: activated carbon, zeolite, diatomite, chitosan and titanium dioxide, and the mass ratio of the activated carbon, zeolite, diatomite, chitosan and photocatalyst is 120:1:1:1:1; S2. Use molding to compound the raw material board after baking in step S1 with the fabric to obtain the structure of the designed automobile tailgate trim panel, then injection mold the characteristic structure on the back to obtain the finished skeleton, and finally perform punching on the finished skeleton to remove the excess scraps and then assemble to obtain the finished product. The clamping force of the molding is 360 T, and the clamping time is 120 s. The injection molding parameters are as follows: injection time is 11 s, and the temperature is 210 °C. The material of the fabric is printed non-woven fabric.

[0038] Example 6 The difference between this example and Example 1 is only that this example does not contain fibers, and the others are the same as Example 1, so they will not be elaborated here.

[0039] Example 7 This embodiment provides an automobile tailgate trim panel, which is only different from that of Embodiment 1 in that this embodiment does not contain biological filter powder, and the rest is the same as that of Embodiment 1, so it will not be elaborated here.

[0040] The performance of the automobile tailgate trim panels prepared in Embodiments 1-7 was detected using the odor test standard VDA270, and the test results are shown in Table 1:

[0041]

[0042]

[0043]

[0044] It can be seen from the above results that the automobile tailgate trim panel of the present invention can significantly reduce the weight by up to more than 30% by using a lightweight raw material board or felt and injection molding characteristic structures on the back, which is of great significance for improving fuel efficiency, reducing emissions and increasing the cruising range of electric vehicles. By adopting the one-step manufacturing process Compression backing injection (CBI), the steps that require a large amount of glue in the traditional process are eliminated, significantly reducing the emissions of VOC (volatile organic compounds) and improving the environmental performance of the product; the strength of the automobile tailgate trim panel can also be flexibly adjusted by adjusting the gram weight of the fiberboard, formula design and the design of the injection molding characteristics on the back. This adjustable strength design enables the trim panel to adapt to different usage requirements, providing sufficient strength and toughness to ensure the usage safety and lifespan in various environments.

[0045] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the protection scope of the present invention.

Claims

1. A preparation method of an automobile tailgate trim panel, characterized in that, The preparation method specifically includes the following steps: S1. Bake the raw material board or felt material; S2. Use the skin or fabric to apply the material to the raw material board or felt material after baking in step S1; S3. Obtain the tailgate trim by one-step compression molding - injection molding - punching; 2. The preparation method according to claim 1, characterized in that, In step S1, the baking temperature is 160 - 270 °C, and the baking time is 135 - 255 s.

3. The preparation method according to claim 1, characterized in that, The raw material board or felt material is doped with fibers and biological filter powder. The fibers include first fibers and second fibers. The first fibers are bonding fibers and / or PP fibers. The second fibers are selected from one or more of PET fibers, PA fibers, glass fibers, hemp fibers, bamboo and wood fibers, and coconut coir fibers. The mass percentage content of the first fibers in the fibers is 10 - 80%, and the balance is the second fibers.

4. The preparation method according to claim 3, characterized in that, The raw material board or felt material is obtained by the following method: Sprinkle the fibers and biological filter powder on the raw material board or felt material in sequence, and then compound them by a compounding machine.

5. The preparation method according to claim 4, characterized in that, The raw material composition of the biological filter powder is: activated carbon, zeolite, diatomaceous earth, chitosan and titanium dioxide. The mass ratio of the activated carbon, zeolite, diatomaceous earth, chitosan and photocatalyst is (88 - 120):1:1:1:

1.

6. The preparation method according to claim 1, characterized in that, The specific steps of step S3 are as follows: Use compression molding to compound the raw material board or felt material with the skin or fabric in step S2 to obtain the structure of the designed automotive tailgate trim, then injection mold the structure on the back to obtain the finished skeleton, and finally punch the finished skeleton to remove the excess scraps and then assemble to obtain the finished product.

7. The preparation method according to claim 6, characterized in that, The clamping force of the compression molding is 330 - 360 T, and the clamping time is 80 - 120 s.

8. The preparation method according to claim 1, characterized in that, In step S3, the injection molding parameters are as follows: the injection molding time is 5 - 15 s, and the temperature is 200 - 250 °C.

9. The preparation method according to claim 1, characterized in that, In step S2, the material of the skin is selected from one of TPO, PU, PVC, ultra-fine fiber and genuine leather; the material of the fabric is selected from one of suede-like fabric, knitted fabric, fleece blanket surface, tufted blanket surface and non-woven fabric.

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