Lightweight high-strength refrigerator door body panel and preparation method thereof

Abstract

The invention provides a light high-strength refrigerator door body panel and a preparation method thereof.The method comprises the steps that glass fibers and a resin matrix are mixed and subjected to compression molding, and a glass fiber board base material is obtained; the first surface of the glass fiber board base material is coated with back paint, and a back paint layer is formed after curing; sequentially depositing a high-brightness ink layer and a twinkling metal layer on the second surface of the glass fiber board base material; coating soft-feeling layer matrix resin on the surface of the shiny metal layer, embedding a fiber reinforcement body, and curing to obtain a soft-feeling layer; and mechanically polishing the outer surface of the soft layer to form frosted lines, and performing surface decoration process treatment to obtain the refrigerator door body panel. According to the refrigerator door body panel, the glass fiber reinforced resin-based composite material is adopted as the base material, and the problems that a traditional refrigerator door body panel is large in weight and low in strength are solved. The glass fiber material has excellent mechanical property and light weight characteristic, is lighter than a traditional steel plate, keeps excellent impact resistance and rebound resilience, improves the safety of a product, and prolongs the service life of the product.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and more particularly to a lightweight and high-strength refrigerator door panel and a preparation method thereof. Background Art

[0002] With the improvement of people's living standards, refrigerators have become essential household appliances in modern families. Moreover, refrigerators have evolved from simple food storage devices to home highlights that combine practical functions and decorative effects. When consumers choose a refrigerator, they not only pay attention to basic parameters such as its refrigeration performance and capacity, but also put forward higher requirements for the appearance design and material texture of the refrigerator. As the most intuitive display part of the refrigerator's appearance, the choice of the material of the refrigerator door panel directly affects the overall aesthetics, durability, and user experience of the refrigerator.

[0003] The main materials for refrigerator door panels on the market are mainly steel plates and glass. Steel plate panels have always occupied an important position in the refrigerator manufacturing field due to their good strength and durability. It can effectively resist collisions and scratches during daily use, ensuring the long-term integrity of the refrigerator's appearance. Glass panels have a delicate appearance and a unique texture. The transparency and gloss of the glass can endow the refrigerator door with a simple and modern visual effect.

[0004] However, at present, although the steel plate panel has a certain strength, it is relatively heavy, which is inconvenient for processing, transportation, and installation. Although the glass panel has a delicate appearance, it has a certain self-explosion rate and poor impact resistance, and the price is relatively high. In addition, the surfaces of steel plate and glass panels are smooth, but they are prone to leaving fingerprints and water stains in a humid environment, affecting the aesthetics, and their smooth surfaces may cause slippage due to sweating of the hands during operation, bringing inconvenience to users. Summary of the Invention

[0005] To solve the above problems of the existing steel plate panel being relatively heavy, the glass panel having a self-explosion rate and poor impact resistance, and the surfaces of the steel plate and glass panels being smooth, resulting in slippage during operation and bringing inconvenience to users.

[0006] On the one hand, the present application provides a preparation method for a refrigerator door panel, including the following steps:

[0007] Mix and mold glass fiber with a resin matrix to obtain a glass fiber board substrate;

[0008] Coat a back paint on the first surface of the glass fiber board substrate, and form a back paint layer after curing;

[0009] Deposit a high-brightness ink layer and a shiny metal layer in sequence on the second surface of the glass fiber board substrate;

[0010] Coat the surface of the shiny metal layer with a flexible layer matrix resin, embed a fiber reinforcement, and cure to obtain a flexible layer;

[0011] Mechanically polish the outer surface of the flexible layer to form a frosted texture, and perform a surface decoration process to obtain a refrigerator door panel.

[0012] In a feasible implementation, in the step of mixing and molding the glass fiber and the resin matrix, the volume ratio of the glass fiber is 30%-60%, and the resin matrix is one of polypropylene, unsaturated polyester resin, or epoxy resin.

[0013] In a feasible implementation, the back paint layer is an acrylic resin or epoxy resin coating with a thickness of 10-25 μm.

[0014] In a feasible implementation, the high-brightness ink layer is an organic pigment or inorganic pigment coating with a thickness of 5-12 μm.

[0015] In a feasible implementation, the shiny metal layer is an aluminum foil or a copper foil with a thickness of 20-35 μm. In a feasible implementation, the material of the flexible layer is an epoxy resin or polyurethane resin matrix, doped with a polyurethane powder coating or a silicone powder coating, and the total thickness is 100-250 μm.

[0016] In a feasible implementation, the fiber reinforcement is one of carbon fiber, glass fiber, cellulose fiber, and hemp fiber, with a length of 15-30 mm and a diameter of 3-5 μm, and the content of the fiber reinforcement in the matrix resin is 5%-15%.

[0017] In a feasible implementation, the roughness of the frosted texture is Ra0.8-1.5 μm and is prepared by a mechanical polishing process.

[0018] In a feasible implementation, the surface decoration process includes one or more of spraying, transfer printing, screen printing, and laser engraving.

[0019] The second aspect of the present application provides a lightweight and high-strength refrigerator door panel, prepared by using the preparation method of any one of the above-mentioned refrigerator door panels, including: a glass fiber board substrate, a back paint layer, a decoration layer group, and a flexible layer;

[0020] The glass fiber board substrate is a glass fiber reinforced resin matrix composite material, and glass fibers penetrate through the glass fiber board substrate along the thickness direction;

[0021] The back paint layer is coated on the first surface of the glass fiber board substrate. The decorative layer group includes: a high-brightness ink layer, a shiny metal layer, and a soft-touch layer that are stacked in sequence. The high-brightness ink layer, the shiny metal layer, and the soft-touch layer are all disposed on the second surface of the glass fiber board substrate;

[0022] The soft-touch layer is doped with a fiber reinforcement, and the outer surface of the soft-touch layer is formed with a matte texture by polishing.

[0023] As can be seen from the above, the present application provides a lightweight and high-strength refrigerator door panel and a preparation method thereof. Glass fiber reinforced plastic or glass fiber reinforced resin is used as the core material of the refrigerator door, replacing traditional steel plates and glass. It is light in weight, convenient for processing, transportation and installation, overcomes the disadvantage of heavy weight of traditional steel plate panels, has high strength, excellent impact resistance and rebound performance, and avoids the problems of self-explosion rate and poor impact resistance of glass panels. At the same time, the glass fiber material has excellent corrosion resistance and flame retardancy, improves the safety and service life of the product, and has a lower cost than glass panels, which is conducive to the promotion and popularization of the product in the market. Description of the Drawings

[0024] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments that conform to the implementation of the present invention, and are used together with the specification to explain the principles of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the implementation of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 is a schematic flow chart of the preparation of a lightweight and high-strength refrigerator door panel shown in an embodiment of the present application;

[0026] Figure 2 is a schematic structural diagram of a lightweight and high-strength refrigerator door panel shown in an embodiment of the present application.

[0027] Explanation of the Reference Numerals in the Drawings:

[0028] 100 - glass fiber board substrate; 110 - back paint layer; 120 - decorative layer group; 130 - soft-touch layer; 121 - high-brightness ink layer; 122 - shiny metal layer. Detailed Embodiments

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the embodiments of the present invention will be more comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the implementation of the embodiments of the present invention.

[0030] The mainstream refrigerator door panel materials on the market are mainly steel plates and glass. Steel plate panels have good strength and durability, and can effectively resist collisions and scratches in daily use. Glass panels have exquisite appearance and unique texture. The transparency and glossiness of glass can give the refrigerator door a simple and modern visual effect. However, at present, although steel plate panels have certain strength, they are heavy and inconvenient to process, transport and install. Although glass panels have exquisite appearance, they have a certain self-explosion rate and impact resistance deviation, and the price is relatively high. In addition, the surface of steel plate and glass panels is smooth, but it is easy to leave fingerprints and water stains in a humid environment, which affects the appearance. Moreover, their smooth surface may cause slippage during operation due to sweaty hands and other reasons, which brings inconvenience to users.

[0031] In order to solve the above problems, the first aspect of the embodiment of the present application proposes a method for preparing a refrigerator door panel, referring to Figure 1 As shown, the steps include:

[0032] S100: Mixing the glass fiber and the resin matrix and performing compression molding to obtain a glass fiber board substrate. Specifically, according to the required size and shape, appropriate glass fiber materials and resin matrix are selected, mixed evenly, poured into a mold for compression molding, and the glass fiber board substrate is obtained.

[0033] Among them, the glass fiber board substrate, as the core layer of the door panel, can provide support and strength for the entire panel, and provide light weight and high strength characteristics, solving the problem of heavy weight and low strength of traditional refrigerator door panels. The glass fiber material also has excellent impact resistance and resilience, can withstand external impact, has good anti-corrosion and flame retardant properties, and improves the safety and service life of the panel.

[0034] S200: coating a back paint on the first surface of the glass fiber board substrate, and forming a back paint layer after curing.

[0035] The back paint layer is coated on the first surface of the glass fiber board substrate and is used to connect with the refrigerator door component, thereby improving the adhesion between the glass fiber board substrate and the refrigerator door component and solving the problem of easy falling off of the panel.

[0036] S300: Deposit a high-brightness ink layer and a shiny metal layer successively on the second surface of the fiberglass board substrate, which can increase the glossiness of the substrate layer.

[0037] S400: Coating the surface of the shiny metal layer with a matrix resin of the soft-touch layer, and embedding a fiber reinforcement and then curing to obtain the soft-touch layer. Specifically, coat the liquid resin on the shiny metal layer, and then brush a flexible touch powder coating on the side of the liquid resin in contact with the air to form the soft-touch layer. During the coating process, embed a preset proportion of fiber reinforcement, and then cure at the corresponding temperature to obtain the soft-touch layer.

[0038] S500: Mechanically polish the outer surface of the soft-touch layer to form a matte texture, and perform surface decoration process treatment to obtain the refrigerator door panel.

[0039] It can be understood that the surface of the fiberglass board substrate can be treated by surface decoration processes such as spraying, transfer printing, screen printing, and laser engraving according to requirements, so as to achieve diverse appearance and feel effects.

[0040] Carbon fiber is doped in the soft-touch layer as the fiber reinforcement to further improve the touch smoothness and strength, and solve the problems of easy wear and low strength of the soft-touch layer. The outer surface of the soft-touch layer is formed into a matte texture by grinding, which can prevent external environmental light from irradiating on the refrigerator door panel, and form reflected light through the metal in the shiny metal layer to avoid light pollution. At the same time, it can also further protect the soft-touch layer and avoid scratches, cracks, etc.

[0041] Furthermore, through the surface decoration process, diverse appearance and feel effects can be achieved to meet the personalized needs of consumers. The soft-touch layer provides a soft and skin-friendly touch, improving the user's comfort in use.

[0042] This application illustrates the specific operation of the preparation method of the refrigerator door panel through the following specific embodiment cases.

[0043] Example 1:

[0044] In the preparation process of the refrigerator door panel provided in Example 1 of this application, glass fiber reinforced polypropylene is selected as the substrate material, and the volume proportion of glass fiber is 40%, and the resin matrix is polypropylene.

[0045] Mix the glass fiber and the polypropylene resin matrix evenly, and then pour it into a mold for compression molding to obtain the fiberglass board substrate. The temperature of compression molding is 180 °C, the pressure is 10 MPa, and the molding time is 5 minutes.

[0046] Brush an acrylic resin back paint on the first surface of the fiberglass board substrate, and then cure it at room temperature for 2 hours to form a back paint layer with a thickness of 15 μm.

[0047] Deposit a high-brightness organic pigment ink layer on the second surface of the glass fiber board substrate, and then cure it at 80 °C for 30 minutes to form a high-brightness ink layer with a thickness of 8 μm.

[0048] Deposit an aluminum foil layer on the high-brightness ink layer, and then cure it at room temperature for 1 hour to form a shiny metal layer with a thickness of 25 μm.

[0049] Coat epoxy resin on the shiny metal layer, and then brush polyurethane powder coating on the side of the epoxy resin in contact with air to form a soft feeling layer. During the coating process of the epoxy resin and the polyurethane powder coating, carbon fibers with a length of 20 mm and a diameter of 4 μm are embedded as fiber reinforcements, and the content of the fiber reinforcements in the matrix resin is 10%. Then cure it at 120 °C for 1 hour to obtain a soft feeling layer with a thickness of 150 μm.

[0050] Mechanically polish the outer surface of the soft feeling layer to form a matte texture with a roughness of Ra 1.0 μm.

[0051] Use a spraying process to perform surface treatment on the glass fiber board substrate, and spray a transparent protective coating to improve the wear resistance and corrosion resistance of the panel.

[0052] Example 2:

[0053] In the preparation process of the door body panel for the refrigerator provided in the second embodiment of this application, glass fiber reinforced resin is selected as the base material. The volume ratio of the glass fiber is 50%, and the resin matrix is unsaturated polyester resin.

[0054] Mix the glass fiber and the unsaturated polyester resin matrix evenly, and then pour it into a mold for compression molding to obtain a glass fiber board substrate. The temperature for compression molding is 160 °C, the pressure is 15 MPa, and the molding time is 8 minutes.

[0055] Brush epoxy resin back paint on the first surface of the glass fiber board substrate, and then cure it at room temperature for 3 hours to form a back paint layer with a thickness of 20 μm.

[0056] Deposit a high-brightness inorganic pigment ink layer on the second surface of the glass fiber board substrate, and then cure it at 100 °C for 20 minutes to form a high-brightness ink layer with a thickness of 10 μm.

[0057] Deposit a copper foil layer on the high-brightness ink layer, and then cure it at room temperature for 2 hours to form a shiny metal layer with a thickness of 30 μm.

[0058] Apply polyurethane resin on top of the shiny metal layer, and then brush silicone powder coating on the side of the polyurethane resin that contacts the air to form a soft-feel layer. During the application of the polyurethane resin and the silicone powder coating, embed glass fibers with a length of 25 mm and a diameter of 3 μm as the fiber reinforcement, and the content of the fiber reinforcement in the matrix resin is 12%. Then cure at 100 °C for 2 hours to obtain a soft-feel layer with a thickness of 200 μm.

[0059] Mechanically polish the outer surface of the soft-feel layer to form a matte texture with a roughness of Ra 1.2 μm.

[0060] Use a transfer printing process to perform surface treatment on the glass fiber board substrate, and transfer a decorative layer with a pattern to improve the decoration of the panel.

[0061] Example Three

[0062] In the preparation process of the door panel for the refrigerator provided in Example Two of this application, choose glass fiber reinforced plastic as the substrate material. The volume ratio of glass fiber is 30%, and the resin matrix is epoxy resin.

[0063] Mix the glass fiber and the epoxy resin matrix evenly, and then pour them into a mold for compression molding to obtain a glass fiber board substrate. The temperature for compression molding is 150 °C, the pressure is 20 MPa, and the molding time is 10 minutes.

[0064] Brush acrylic resin back paint on the first surface of the glass fiber board substrate, and then cure at room temperature for 1.5 hours to form a back paint layer with a thickness of 10 μm.

[0065] Deposit a mixed ink layer of high-brightness organic pigment and inorganic pigment on the second surface of the glass fiber board substrate, and then cure at 90 °C for 25 minutes to form a high-brightness ink layer with a thickness of 5 μm.

[0066] Deposit an aluminum foil layer on top of the high-brightness ink layer, and then cure at room temperature for 1.5 hours to form a shiny metal layer with a thickness of 20 μm.

[0067] Apply epoxy resin on top of the shiny metal layer, and then brush polyurethane powder coating on the side of the epoxy resin that contacts the air to form a soft-feel layer. During the application of the epoxy resin and the polyurethane powder coating, embed cellulose fibers with a length of 15 mm and a diameter of 5 μm as the fiber reinforcement, and the content of the fiber reinforcement in the matrix resin is 5%. Then cure at 130 °C for 0.5 hours to obtain a soft-feel layer with a thickness of 100 μm.

[0068] Mechanically polish the outer surface of the soft-feel layer to form a matte texture with a roughness of Ra 0.8 μm.

[0069] The surface of the glass fiber board substrate is treated by screen printing process, and a pattern with brand logo is screen printed to improve the brand recognition of the panel.

[0070] Example 4

[0071] In the preparation process of the door panel for refrigerator provided by the fourth embodiment of the present application, glass fiber reinforced polypropylene is selected as the substrate material. The volume proportion of glass fiber is 60%, and the resin matrix is polypropylene.

[0072] The glass fiber and the polypropylene resin matrix are mixed evenly, and then poured into a mold for compression molding to obtain the glass fiber board substrate. The temperature of compression molding is 190 °C, the pressure is 8 MPa, and the molding time is 3 minutes.

[0073] Epoxy resin back paint is applied to the first surface of the glass fiber board substrate, and then cured at room temperature for 4 hours to form a back paint layer with a thickness of 25 μm.

[0074] A high-brightness inorganic pigment ink layer is deposited on the second surface of the glass fiber board substrate, and then cured at 70 °C for 40 minutes to form a high-brightness ink layer with a thickness of 12 μm.

[0075] A copper foil layer is deposited on the high-brightness ink layer, and then cured at room temperature for 3 hours to form a shiny metal layer with a thickness of 35 μm.

[0076] Polyurethane resin is coated on the shiny metal layer, and then silicone powder coating is applied to the side of the polyurethane resin in contact with air to form a soft feeling layer. During the coating process of the polyurethane resin and the silicone powder coating, hemp fibers with a length of 30 mm and a diameter of 3 μm are embedded as fiber reinforcements, and the content of the fiber reinforcements in the matrix resin is 15%. Then it is cured at 90 °C for 3 hours to obtain a soft feeling layer with a thickness of 250 μm.

[0077] The outer surface of the soft feeling layer is mechanically polished to form a frosted texture with a roughness of Ra 1.5 μm.

[0078] The surface of the glass fiber board substrate is treated by laser engraving process, and a three-dimensional pattern is laser engraved to improve the three-dimensional sense and texture of the panel.

[0079] Example 5

[0080] In the preparation process of the door panel for refrigerator provided by the fifth embodiment of the present application, glass fiber reinforced resin is selected as the substrate material. The volume proportion of glass fiber is 45%, and the resin matrix is unsaturated polyester resin.

[0081] Mix the glass fiber evenly with the unsaturated polyester resin matrix, and then pour it into a mold for compression molding to obtain a glass fiber board substrate. The temperature for compression molding is 170 °C, the pressure is 12 MPa, and the molding time is 6 minutes.

[0082] Paint an acrylic resin back paint on the first surface of the glass fiber board substrate, and then cure it at room temperature for 2.5 hours to form a back paint layer with a thickness of 18 μm.

[0083] Deposit a mixed ink layer of high-brightness organic pigment and inorganic pigment on the second surface of the glass fiber board substrate, and then cure it at 85 °C for 35 minutes to form a high-brightness ink layer with a thickness of 7 μm.

[0084] Deposit an aluminum foil layer on top of the high-brightness ink layer, and then cure it at room temperature for 2.5 hours to form a shiny metal layer with a thickness of 28 μm.

[0085] Coat epoxy resin on top of the shiny metal layer, and then paint a polyurethane powder coating on the side where the epoxy resin contacts the air to form a soft-touch layer. During the coating process of the epoxy resin and the polyurethane powder coating, embed glass fibers with a length of 22 mm and a diameter of 4 μm as fiber reinforcements, and the content of the fiber reinforcements in the matrix resin is 8%. Then cure it at 110 °C for 1.5 hours to obtain a soft-touch layer with a thickness of 180 μm.

[0086] Mechanically polish the outer surface of the soft-touch layer to form a matte texture with a roughness of Ra 1.1 μm.

[0087] Adopt a process combining spraying and transfer printing to perform surface treatment on the glass fiber board substrate. First, spray a base color coating, and then transfer a decorative layer with a pattern to improve the decoration and layering of the panel.

[0088] Example Six

[0089] In the preparation process of the door body panel for the refrigerator provided in Example Six of this application, glass fiber reinforced plastic is selected as the base material. The volume ratio of the glass fiber is 55%, and the resin matrix is epoxy resin.

[0090] Mix the glass fiber evenly with the epoxy resin matrix, and then pour it into a mold for compression molding to obtain a glass fiber board substrate. The temperature for compression molding is 140 °C, the pressure is 18 MPa, and the molding time is 12 minutes.

[0091] Paint an epoxy resin back paint on the first surface of the glass fiber board substrate, and then cure it at room temperature for 3.5 hours to form a back paint layer with a thickness of 22 μm.

[0092] Deposit a high-brightness organic pigment ink layer on the second surface of the fiberglass board substrate, and then cure it at 95 °C for 15 minutes to form a high-brightness ink layer with a thickness of 6 μm.

[0093] Deposit a copper foil layer on the high-brightness ink layer, and then cure it at room temperature for 3.5 hours to form a shiny metal layer with a thickness of 22 μm.

[0094] Coat the polyurethane resin on the shiny metal layer, and then brush silicone powder coating on the side of the polyurethane resin in contact with the air to form a soft-touch layer. During the coating of the polyurethane resin and the silicone powder coating, carbon fibers with a length of 28 mm and a diameter of 3 μm are embedded as fiber reinforcements, and the content of the fiber reinforcements in the matrix resin is 14%. Then cure it at 80 °C for 4 hours to obtain a soft-touch layer with a thickness of 220 μm.

[0095] Mechanically polish the outer surface of the soft-touch layer to form a matte texture with a roughness of Ra 1.4 μm.

[0096] Adopt a process combining screen printing and laser engraving to perform surface treatment on the fiberglass board substrate. First, screen print a pattern with a brand logo, and then laser engrave a three-dimensional pattern to improve the brand recognition and three-dimensional sense of the panel.

[0097] Another aspect of the embodiment of the present application provides a refrigerator door panel, referring to Figure 2 As shown, the refrigerator door panel mainly consists of a fiberglass board substrate 100, a back paint layer 110, a decoration layer group 120, and a soft-touch layer 130.

[0098] The fiberglass board substrate 100 serves as the core layer, providing strength and support. The back paint layer 110 is coated on the first surface of the fiberglass board substrate 100, that is, the side connected to the refrigerator door component. The decoration layer group 120 includes a high-brightness ink layer 121, a shiny metal layer 122, and a soft-touch layer 130, all of which are provided on the second surface of the fiberglass board substrate 100, that is, the side facing the user. The high-brightness ink layer 121 is directly deposited on the fiberglass board substrate 100, the shiny metal layer 122 is deposited on the high-brightness ink layer 121, and the soft-touch layer 130 is deposited on the shiny metal layer 122. The soft-touch layer 130 is doped with a second fiber reinforcement, and its outer surface is formed into a matte texture by polishing.

[0099] Among them, the fiberglass board substrate 100 serves as the core layer of the refrigerator door panel, providing strength and support to ensure the flatness and stability of the panel. The glass fiber reinforced resin-based composite material has excellent mechanical properties and lightweight characteristics, and can meet the dual requirements of the refrigerator door panel for strength and weight.

[0100] Furthermore, the back paint layer 110 can improve the adhesion between the glass fiber board substrate 100 and the refrigerator door component, ensuring a firm connection between the panel and the door body. The back paint layer material, such as acrylic resin or epoxy resin, has good adhesion properties and can form strong chemical bonds with the surface of the glass fiber board substrate and the refrigerator door component.

[0101] The high-brightness organic or inorganic pigments in the high-brightness ink layer 121 can reflect more light, making the surface of the panel present a high-brightness effect. The long fibers doped in the second fiber reinforcement, such as carbon fiber and glass fiber, can be evenly distributed in the soft feeling layer, enhancing the mechanical properties and surface flatness of the material, and improving the tactile smoothness and strength of the soft feeling layer. The frosted texture can diffuse light, reduce specular reflection, and thus reduce light pollution. At the same time, the frosted surface can increase the wear resistance and scratch resistance of the panel.

[0102] According to the content of the above embodiments, the present application solves the problems of heavy weight and low strength of the traditional refrigerator door panel by using a glass fiber reinforced resin matrix composite material as the substrate. The glass fiber material has excellent mechanical properties and lightweight characteristics, and can meet the dual requirements of the refrigerator door panel for strength and weight. By applying a back paint layer on the first surface of the glass fiber board substrate, the adhesion between the substrate and the refrigerator door component is improved, ensuring a firm connection between the panel and the door body. It is lighter than the traditional steel plate while maintaining excellent impact resistance and rebound performance, and further improves the safety and service life of the product, which is conducive to the promotion and popularization of the product.

[0103] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not disclosed herein. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

Claims

1. A preparation method of a refrigerator door body panel, characterized in that, It includes the following steps: Mix and compression mold glass fiber and a resin matrix to obtain a glass fiber board substrate; Coat a back paint on the first surface of the glass fiber board substrate, and form a back paint layer after curing; Deposit a high-brightness ink layer and a shiny metal layer in sequence on the second surface of the glass fiber board substrate; Coat a flexible layer matrix resin on the surface of the shiny metal layer, embed a fiber reinforcement and then cure to obtain a flexible layer; Mechanically polish the outer surface of the flexible layer to form a frosted texture, and perform a surface decoration process to obtain a refrigerator door panel.

2. The preparation method of a refrigerator door body panel according to claim 1, characterized in that, In the step of mixing and compression molding glass fiber and a resin matrix, the volume ratio of the glass fiber is 30%-60%, and the resin matrix is one of polypropylene, unsaturated polyester resin or epoxy resin.

3. The preparation method of a refrigerator door body panel according to claim 1, characterized in that, The back paint layer is an acrylic resin or epoxy resin coating with a thickness of 10-25 μm.

4. The preparation method of a refrigerator door body panel according to claim 2, wherein, The high-brightness ink layer is an organic pigment or inorganic pigment coating with a thickness of 5-12 μm.

5. The preparation method of a refrigerator door body panel according to claim 2, characterized in that, The shiny metal layer is an aluminum foil or copper foil with a thickness of 20-35 μm.

6. The preparation method of a refrigerator door body panel according to claim 2, wherein, The material of the flexible layer is an epoxy resin or polyurethane resin matrix, doped with a polyurethane powder coating or silicone powder coating inside, and the total thickness is 100-250 μm.

7. A method for preparing a refrigerator door panel according to claim 1, characterized in that The fiber reinforcement is one of carbon fiber, glass fiber, cellulose fiber and hemp fiber, with a length of 15-30 mm and a diameter of 3-5 μm, and the content of the fiber reinforcement in the matrix resin is 5%-15%.

8. The preparation method of a refrigerator door body panel according to claim 1, characterized in that The roughness of the frosted texture is Ra0.8-1.5 μm, and it is prepared by a mechanical polishing process.

9. The preparation method of a refrigerator door body panel according to claim 1, characterized in that The surface decoration process includes one or more of spraying, transfer printing, screen printing and laser engraving.

10. A lightweight and high-strength refrigerator door panel, characterized in that, Prepared by using the preparation method of a refrigerator door panel according to any one of claims 1-8, including: a glass fiber board substrate (100), a back paint layer (110), a decoration layer group (120) and a flexible layer (130); The glass fiber board substrate (100) is a glass fiber reinforced resin-based composite material, and glass fibers penetrate through the glass fiber board substrate (100) along the thickness direction; The back paint layer (110) is coated on the first surface of the glass fiber board substrate (100), and the decoration layer group (120) includes: a high-brightness ink layer (121), a shiny metal layer (122) and a flexible layer (130) stacked in sequence, and the high-brightness ink layer (121), the shiny metal layer (122) and the flexible layer (130) are all arranged on the second surface of the glass fiber board substrate (100); The flexible layer (130) is doped with a fiber reinforcement, and the outer surface of the flexible layer (130) forms a frosted texture through polishing.

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