Hot-pressed jute fiber composite board for automotive trim and preparation method of hot-pressed jute fiber composite board

Abstract

The invention discloses a hot-pressed jute fiber composite board for automotive trim and a preparation method thereof.The hot-pressed jute fiber composite board for automotive trim comprises a bottom layer, a base layer bonded to the top of the bottom layer, a middle layer arranged at the top of the base layer, a top layer arranged at the top of the middle layer and a flame-retardant layer bonded to the top of the top layer; the top of the base layer is coated with a flame-retardant layer, the top of the flame-retardant layer is coated with an anti-oxidation coating, the specific material of the base layer is a polypropylene plate, the specific material of the middle layer is a fibrilia composite plate, the specific material of the top layer is polyvinyl fluoride, and the specific material of the base layer is a high-density fiberboard. The flax fiber composite board is located in the middle, the flame-retardant layer and the coating are located at the top of the flax fiber composite board, the flax fiber composite board is protected, the strength and durability are both considered, the service life is greatly prolonged, and the bottom layer facilitates bonding installation of the flax fiber composite board.

Description

Technical Field

[0001] The invention relates to the technical field of hemp fiber composite boards, and in particular to a hot-pressed hemp fiber composite board for automobile interior decoration and a preparation method thereof. Background Art

[0002] As people's requirements for environmental protection increase, automotive interior materials are developing towards "green" environmentally friendly materials. Some materials used in the production of automotive interiors in the early stage, such as PU boards (polyurethane boards), fiberglass boards, etc., are gradually being replaced by natural hemp fiber composite materials due to their defects in pollution. The processing of natural hemp fiber composite materials usually involves mixing natural fibers and chemical fibers into felt boards and then heating and pressurizing them.

[0003] In the prior art, the amount of natural fiber used in automobile interior materials is small and the strength of the board is low. Therefore, the present invention provides a hot-pressed hemp fiber composite board for automobile interior and a preparation method thereof to solve the above problems. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a hot-pressed hemp fiber composite board for automobile interior and a preparation method thereof.

[0005] The present invention provides a hot-pressed hemp fiber composite board for automobile interior, comprising a bottom layer, a base layer bonded to the top of the bottom layer, an intermediate layer provided on the top of the base layer, a top layer provided on the top of the intermediate layer, a flame retardant layer bonded to the top of the top layer, and an anti-oxidation coating applied on the top of the flame retardant layer.

[0006] Preferably, the specific material of the base layer is a polypropylene board.

[0007] Furthermore, the base layer cooperates well with the glue, which facilitates the bonding and use of the hot-pressed hemp fiber composite board.

[0008] Preferably, the specific material of the middle layer is a hemp fiber composite board, the specific material of the top layer is polyvinyl fluoride, and the specific material of the base layer is a high-density fiberboard.

[0009] Furthermore, the top layer and the base layer can be well connected to the middle layer, and can also be well connected to other layers.

[0010] Preferably, the flame retardant layer is made of a mixture of a polycarbonate board and a flame retardant.

[0011] Furthermore, the flame retardant layer is used to prevent a larger fire from occurring when a surface fire occurs, and to prevent the middle layer from being damaged.

[0012] Preferably, the anti-oxidation coating is a UV absorber.

[0013] Furthermore, the anti-oxidation layer is to prevent the surface of the plate from being damaged by oxidation.

[0014] A method for preparing a hot-pressed hemp fiber composite board for automobile interior decoration comprises the following steps: S1: Preparation of hot pressed hemp fiber composite board; S2: Make a flame retardant layer; S3: sheet material combination; S4: Finally, an anti-oxidation coating is applied on top of the flame retardant layer.

[0015] Preferably, in the step S1, hemp fiber is prepared, the hemp fiber is composed of jute silk and hemp silk, the ratio is 1-8:2-5, and then epoxy resin is prepared, the ratio of hemp fiber to epoxy resin is 1-8:2-5, the hemp fiber and epoxy resin are poured into the inner side of the mold for mixing, and after the mixing is completed, a hot press is prepared to perform a hot pressing process on the flax fiber and epoxy resin inside the mold, the parameters are 160-200 degrees Celsius, and the pressure is 10-20 MPa, to obtain a hot pressed hemp fiber composite board. Hemp fiber is a natural material that is degradable and has good The ecological and environmental protection performance meets the needs of sustainable development. The strength and rigidity of hemp fiber are high, which makes the hot-pressed hemp fiber composite board have good mechanical strength, impact resistance and wear resistance. Compared with traditional wood and some composite materials, hemp fiber composite board is lighter and easier to transport and process. The hemp fiber and resin are combined through the hot pressing process, which makes the composite board more compact and stable during the molding process, and improves the weather resistance and aging resistance of the material. Since hemp fiber is widely available and has low cost, the production cost of hot-pressed hemp fiber composite board is relatively economical.

[0016] Preferably, in the step S2, the specific material of the flame retardant layer is a mixture of a polycarbonate board and a flame retardant. The polycarbonate and the flame retardant are prepared, placed in a blender, and stirred at a temperature of 80-120 degrees Celsius and a rotation speed of 100-150 revolutions per minute for 5-15 minutes, and then poured into a mold and cooled to form. Polycarbonate is a plastic with excellent impact resistance and high transparency. After flame retardant treatment, the polycarbonate board can prevent the spread of flames in the presence of high temperature or fire source.

[0017] Preferably, in the S3 step, the base layer is placed on top of the bottom layer, the middle layer is placed on top of the base layer, the top layer is placed on top of the middle layer, and the flame retardant layer is placed on top of the top layer. Glue is applied between the layers and compacted. After forming, the layers are cut and polished, trimmed as needed, burrs are removed, and cut into the required size and shape.

[0018] The beneficial effects of the present invention are: The present invention stacks the flax fiber composite board with other boards, with the flax fiber composite board in the middle, and the flame retardant layer and the coating on the top of the flax fiber composite board to protect the flax fiber composite board, thereby achieving both strength and durability and greatly improving the service life. The bottom layer also facilitates the bonding and installation of the flax fiber composite board. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural front and cross-sectional view of a hot-pressed hemp fiber composite board for automobile interior decoration proposed by the present invention; Figure 2 The present invention is a block diagram of a method for preparing a hot-pressed hemp fiber composite board for automobile interior decoration.

[0020] In the figure: 1. Bottom layer; 2. Base layer; 3. Middle layer; 4. Top layer; 5. Flame retardant layer; 6. Anti-oxidation coating. DETAILED DESCRIPTION

[0021] The present invention will be further explained below in conjunction with specific embodiments.

[0022] Reference Figure 1-2 , Embodiment 1 refer to Figure 1 In this embodiment, a hot-pressed hemp fiber composite board for automobile interior is proposed, including a bottom layer 1, a bottom layer 2 is bonded to the top of the bottom layer 1, an intermediate layer 3 is provided on the top of the bottom layer 2, a top layer 4 is provided on the top of the intermediate layer 3, a flame retardant layer 5 is bonded to the top of the top layer 4, and an anti-oxidation coating 6 is applied on the top of the flame retardant layer 5.

[0023] In this embodiment, the specific material of the base layer 2 is a polypropylene board, and the base layer 2 is well matched with glue, so that the hot-pressed hemp fiber composite board can be easily bonded and used.

[0024] In this embodiment, the specific material of the middle layer 3 is a hemp fiber composite board, the specific material of the top layer 4 is polyvinyl fluoride, and the specific material of the base layer 2 is a high-density fiberboard. The top layer 4 and the base layer 2 can be well connected to the middle layer 3 and can also be well connected to other layers.

[0025] In this embodiment, the specific material of the flame retardant layer 5 is a mixture of a polycarbonate board and a flame retardant. The flame retardant layer 5 is used to prevent a larger fire from being caused when a surface fire occurs, and to prevent the middle layer 3 from being damaged.

[0026] In this embodiment, the anti-oxidation coating 6 is an ultraviolet absorber, and the anti-oxidation layer is used to prevent the surface of the plate from being damaged by oxidation.

[0027] The present invention also proposes a method for preparing a hot-pressed hemp fiber composite board for automobile interior decoration, comprising the following steps: S1: Preparation of hot pressed hemp fiber composite board; S2: Making a flame retardant layer 5; S3: sheet material combination; S4: Finally, an anti-oxidation coating 6 is applied on the top of the flame retardant layer 5 .

[0028] Preferably, in step S1, hemp fiber is prepared, and the hemp fiber is composed of jute silk and hemp silk, and the ratio is 1-8:2-5. Then epoxy resin is prepared, and the ratio of hemp fiber to epoxy resin is 1-8:2-5. The hemp fiber and epoxy resin are poured into the inner side of the mold for mixing. After the mixing is completed, a hot press is prepared to perform a hot pressing process on the flax fiber and epoxy resin inside the mold, and the parameters are 160-200 degrees Celsius and the pressure is 10-20 MPa to obtain a hot pressed hemp fiber composite board. Hemp fiber is a natural material that is degradable and has good Ecological and environmental protection performance meets the needs of sustainable development. The strength and rigidity of hemp fiber are relatively high, which makes the hot-pressed hemp fiber composite board have good mechanical strength, impact resistance and wear resistance. Compared with traditional wood and some composite materials, hemp fiber composite board is lighter and easier to transport and process. The hemp fiber and resin are combined through the hot pressing process, which makes the composite board more compact and stable during the molding process, and improves the weather resistance and aging resistance of the material. Since hemp fiber is widely available and the cost is low, the production cost of hot-pressed hemp fiber composite board is relatively economical.

[0029] Preferably, in step S2, the specific material of the flame retardant layer 5 is a mixture of a polycarbonate board and a flame retardant. Polycarbonate and a flame retardant are prepared, placed in a blender, and stirred at a temperature of 80-120 degrees Celsius and a rotation speed of 100-150 revolutions per minute for 5-15 minutes, and then poured into a mold and cooled to form. Polycarbonate is a plastic with excellent impact resistance and high transparency. After flame retardant treatment, the polycarbonate board can prevent the spread of flames in the presence of high temperature or fire source.

[0030] Preferably, in step S3, the base layer 2 is placed on the top of the bottom layer 1, the middle layer 3 is placed on the top of the base layer 2, the top layer 4 is placed on the top of the middle layer 3, and the flame retardant layer 5 is placed on the top of the top layer 4. Glue is applied between the layers and compacted. After molding, the layers are cut and polished, trimmed as needed, burrs removed, and cut into the required size and shape.

[0031] Working principle: First, prepare hemp fiber, which is composed of jute silk and hemp silk, with a ratio of 1-8:2-5. Then prepare epoxy resin, with a ratio of hemp fiber to epoxy resin of 1-8:2-5. Pour hemp fiber and epoxy resin into the inner side of the mold for mixing. After mixing, prepare a hot press to perform a hot pressing process on the flax fiber and epoxy resin inside the mold. The parameters are 160-200 degrees Celsius and the pressure is 10-20 MPa to obtain a hot pressed hemp fiber composite board. The specific material of the flame retardant layer 5 is a mixture of polycarbonate board and flame retardant. Prepare polycarbonate Acid resin and flame retardant, place polycarbonate and flame retardant in a blender, stir at a temperature of 80-120 degrees Celsius and a speed of 100-150 revolutions per minute, mix for 5-15 minutes, pour into a mold and cool to form, place the base layer 2 on the top of the bottom layer 1, the middle layer 3 on the top of the base layer 2, the top layer 4 on the top of the middle layer 3, and the flame retardant layer 5 on the top of the top layer 4, apply glue between the layers and compact them, cut and polish after forming, trim as needed, remove burrs, and cut into the required size and shape.

[0032] Reference Figure 1-2 , Embodiment 2 This embodiment provides a method for preparing a hot-pressed hemp fiber composite board for automobile interior, comprising the following steps: S1: preparing a hot-pressed hemp fiber composite board, preparing hemp fiber, which is composed of jute silk and hemp silk in a ratio of 8:2, and then preparing epoxy resin, the ratio of hemp fiber to epoxy resin is 8:2, pouring the hemp fiber and epoxy resin into the inner side of the mold for mixing, preparing a hot press after the mixing, performing a hot pressing process on the flax fiber and epoxy resin inside the mold, the parameters are 160 degrees Celsius, and the pressure is 10 MPa, so as to obtain a hot-pressed hemp fiber composite board. As a natural material, hemp fiber is degradable and has good ecological and environmental protection performance, which meets the needs of sustainable development. Hemp fiber has high strength and rigidity, so that the hot-pressed hemp fiber composite board has good mechanical strength, impact resistance and wear resistance. Compared with traditional wood and some composite materials, the hemp fiber composite board is lighter and easier to transport and process. The hemp fiber and resin are combined by hot pressing process, so that the composite board is more compact and stable during the molding process, and the weather resistance and aging resistance of the material are improved. Since hemp fiber is widely available and has low cost, the production cost of hot-pressed hemp fiber composite board is relatively economical; S2: preparing a flame retardant layer 5. The specific material of the flame retardant layer 5 is a mixture of a polycarbonate board and a flame retardant. Prepare the polycarbonate and the flame retardant. Place the polycarbonate and the flame retardant in a blender and stir them at a temperature of 80 degrees Celsius and a speed of 100 revolutions per minute for 5 minutes. Pour the mixture into a mold and cool it to form. Polycarbonate is a plastic with excellent impact resistance and high transparency. After flame retardant treatment, the polycarbonate board can prevent the spread of flames in the presence of high temperature or fire source. S3: Assemble the boards, place the base layer 2 on top of the bottom layer 1, the middle layer 3 on top of the base layer 2, the top layer 4 on top of the middle layer 3, and the flame retardant layer 5 on top of the top layer 4, apply glue between the layers, and compact them, cut and grind them after forming, trim them as needed, remove the burrs, and cut them into the required size and shape; S4: Finally, an anti-oxidation coating 6 is applied on the top of the flame retardant layer 5 .

[0033] Reference Figure 1-2 , Embodiment 3 This embodiment provides a method for preparing a hot-pressed hemp fiber composite board for automobile interior, comprising the following steps: S1: preparing a hot-pressed hemp fiber composite board, preparing hemp fiber, which is composed of jute silk and hemp silk in a ratio of 8:2, and then preparing epoxy resin, the ratio of hemp fiber to epoxy resin is 8:2, pouring the hemp fiber and epoxy resin into the inner side of the mold for mixing, preparing a hot press after the mixing, performing a hot pressing process on the flax fiber and epoxy resin inside the mold, the parameters are 170 degrees Celsius, and the pressure is 13 MPa, so as to obtain a hot-pressed hemp fiber composite board. As a natural material, hemp fiber is degradable and has good ecological and environmental protection performance, which meets the needs of sustainable development. Hemp fiber has high strength and rigidity, so that the hot-pressed hemp fiber composite board has good mechanical strength, impact resistance and wear resistance. Compared with traditional wood and some composite materials, the hemp fiber composite board is lighter and easier to transport and process. The hemp fiber and resin are combined by hot pressing process, so that the composite board is more compact and stable during the molding process, and the weather resistance and aging resistance of the material are improved. Since hemp fiber is widely available and has low cost, the production cost of hot-pressed hemp fiber composite board is relatively economical; S2: preparing a flame retardant layer 5. The specific material of the flame retardant layer 5 is a mixture of a polycarbonate board and a flame retardant. Prepare the polycarbonate and the flame retardant. Place the polycarbonate and the flame retardant in a blender and stir them at a temperature of 100 degrees Celsius and a speed of 130 revolutions per minute for 12 minutes. Pour the mixture into a mold and cool it to form. Polycarbonate is a plastic with excellent impact resistance and high transparency. After flame retardant treatment, the polycarbonate board can prevent the spread of flames in the presence of high temperature or fire source. S3: Assemble the boards, place the base layer 2 on top of the bottom layer 1, the middle layer 3 on top of the base layer 2, the top layer 4 on top of the middle layer 3, and the flame retardant layer 5 on top of the top layer 4, apply glue between the layers, and compact them, cut and grind them after forming, trim them as needed, remove the burrs, and cut them into the required size and shape; S4: Finally, an anti-oxidation coating 6 is applied on the top of the flame retardant layer 5 .

[0034] Reference Figure 1-2 , Embodiment 4 This embodiment provides a method for preparing a hot-pressed hemp fiber composite board for automobile interior, comprising the following steps: S1: preparing a hot-pressed hemp fiber composite board, preparing hemp fiber, which is composed of jute silk and hemp silk in a ratio of 8:2, and then preparing epoxy resin, the ratio of hemp fiber to epoxy resin is 8:2, pouring the hemp fiber and epoxy resin into the inner side of the mold for mixing, preparing a hot press after the mixing, performing a hot pressing process on the flax fiber and epoxy resin inside the mold, the parameters are 175 degrees Celsius, and the pressure is 15 MPa, so as to obtain a hot-pressed hemp fiber composite board. As a natural material, hemp fiber is degradable and has good ecological and environmental protection performance, which meets the needs of sustainable development. Hemp fiber has high strength and rigidity, so that the hot-pressed hemp fiber composite board has good mechanical strength, impact resistance and wear resistance. Compared with traditional wood and some composite materials, the hemp fiber composite board is lighter and easier to transport and process. The hemp fiber and resin are combined by hot pressing process, so that the composite board is more compact and stable during the molding process, and the weather resistance and aging resistance of the material are improved. Since hemp fiber is widely available and has low cost, the production cost of hot-pressed hemp fiber composite board is relatively economical; S2: preparing a flame retardant layer 5. The specific material of the flame retardant layer 5 is a mixture of a polycarbonate board and a flame retardant. Prepare the polycarbonate and the flame retardant. Place the polycarbonate and the flame retardant in a blender and stir them at a temperature of 100 degrees Celsius and a speed of 130 revolutions per minute for 10 minutes. Pour the mixture into a mold and cool it to form. Polycarbonate is a plastic with excellent impact resistance and high transparency. After flame retardant treatment, the polycarbonate board can prevent the spread of flames in the presence of high temperature or fire source. S3: Assemble the boards, place the base layer 2 on top of the bottom layer 1, the middle layer 3 on top of the base layer 2, the top layer 4 on top of the middle layer 3, and the flame retardant layer 5 on top of the top layer 4, apply glue between the layers, and compact them, cut and grind them after forming, trim them as needed, remove the burrs, and cut them into the required size and shape; S4: Finally, an anti-oxidation coating 6 is applied on the top of the flame retardant layer 5 .

[0035] Reference Figure 1-2 Embodiment 5 This embodiment provides a method for preparing a hot-pressed hemp fiber composite board for automobile interior, comprising the following steps: S1: preparing a hot-pressed hemp fiber composite board, preparing hemp fiber, which is composed of jute silk and hemp silk in a ratio of 8:2, and then preparing epoxy resin, the ratio of hemp fiber to epoxy resin is 8:2, pouring the hemp fiber and epoxy resin into the inner side of the mold for mixing, preparing a hot press after the mixing, performing a hot pressing process on the flax fiber and epoxy resin inside the mold, the parameters are 180 degrees Celsius, and the pressure is 17 MPa, so as to obtain a hot-pressed hemp fiber composite board. As a natural material, hemp fiber is degradable and has good ecological and environmental protection performance, which meets the needs of sustainable development. Hemp fiber has high strength and rigidity, so that the hot-pressed hemp fiber composite board has good mechanical strength, impact resistance and wear resistance. Compared with traditional wood and some composite materials, the hemp fiber composite board is lighter and easier to transport and process. The hemp fiber and resin are combined by hot pressing process, so that the composite board is more compact and stable during the molding process, and the weather resistance and aging resistance of the material are improved. Since hemp fiber is widely available and has low cost, the production cost of hot-pressed hemp fiber composite board is relatively economical; S2: Making a flame retardant layer 5. The specific material of the flame retardant layer 5 is a mixture of a polycarbonate board and a flame retardant. Prepare the polycarbonate and the flame retardant. Place the polycarbonate and the flame retardant in a blender and stir them at a temperature of 110 degrees Celsius and a speed of 135 revolutions per minute for 13 minutes. Pour the mixture into a mold and cool it to form. Polycarbonate is a plastic with excellent impact resistance and high transparency. After flame retardant treatment, the polycarbonate board can prevent the spread of flames in the presence of high temperature or fire source. S3: Assemble the boards, place the base layer 2 on top of the bottom layer 1, the middle layer 3 on top of the base layer 2, the top layer 4 on top of the middle layer 3, and the flame retardant layer 5 on top of the top layer 4, apply glue between the layers, and compact them, cut and grind them after forming, trim them as needed, remove the burrs, and cut them into the required size and shape; S4: Finally, an anti-oxidation coating 6 is applied on the top of the flame retardant layer 5 .

[0036] Reference Figure 1-2 , Embodiment 6 This embodiment provides a method for preparing a hot-pressed hemp fiber composite board for automobile interior, comprising the following steps: S1: preparing a hot-pressed hemp fiber composite board, preparing hemp fiber, which is composed of jute silk and hemp silk in a ratio of 8:2, and then preparing epoxy resin, the ratio of hemp fiber to epoxy resin is 8:2, pouring the hemp fiber and epoxy resin into the inner side of the mold for mixing, preparing a hot press after the mixing, performing a hot pressing process on the flax fiber and epoxy resin inside the mold, the parameters are 200 degrees Celsius, and the pressure is 20 MPa, so as to obtain a hot-pressed hemp fiber composite board. As a natural material, hemp fiber is degradable and has good ecological and environmental protection performance, which meets the needs of sustainable development. Hemp fiber has high strength and rigidity, so that the hot-pressed hemp fiber composite board has good mechanical strength, impact resistance and wear resistance. Compared with traditional wood and some composite materials, the hemp fiber composite board is lighter and easier to transport and process. The hemp fiber and resin are combined by hot pressing process, so that the composite board is more compact and stable during the molding process, and the weather resistance and aging resistance of the material are improved. Since hemp fiber is widely available and has low cost, the production cost of hot-pressed hemp fiber composite board is relatively economical; S2: preparing a flame retardant layer 5. The specific material of the flame retardant layer 5 is a mixture of a polycarbonate board and a flame retardant. Prepare the polycarbonate and the flame retardant. Place the polycarbonate and the flame retardant in a blender and stir them at a temperature of 120 degrees Celsius and a speed of 150 revolutions per minute for 15 minutes. Pour the mixture into a mold and cool it to form. Polycarbonate is a plastic with excellent impact resistance and high transparency. After flame retardant treatment, the polycarbonate board can prevent the spread of flames in the presence of high temperature or fire source. S3: Assemble the boards, place the base layer 2 on top of the bottom layer 1, the middle layer 3 on top of the base layer 2, the top layer 4 on top of the middle layer 3, and the flame retardant layer 5 on top of the top layer 4, apply glue between the layers, and compact them, cut and grind them after forming, trim them as needed, remove the burrs, and cut them into the required size and shape; S4: Finally, an anti-oxidation coating 6 is applied on the top of the flame retardant layer 5 .

[0037] Comparing the conventional hot pressed hemp fiber composite board with the hot pressed hemp fiber composite board prepared in Examples 2 to 6, the hot pressed hemp fiber composite board prepared in Examples 2 to 6 is shown in the following table: Example two three Four five six Increased strength 25% 23% 22% 24% 24% Lifespan improvement 32% 30% 28% 29% 30% It can be seen from the above table that the method for preparing the hot-pressed hemp fiber composite board for automobile interior provided by the present invention has obvious improvements, and implementation 2 is the best implementation example.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hot-pressed hemp fiber composite board for automobile interior, comprising a bottom layer (1), characterized in that: The top of the bottom layer (1) is bonded with a base layer (2), the top of the base layer (2) is provided with an intermediate layer (3), the top of the intermediate layer (3) is provided with a top layer (4), the top of the top layer (4) is bonded with a flame retardant layer (5), and the top of the flame retardant layer (5) is coated with an anti-oxidation coating (6).

2. The hot-pressed hemp fiber composite board for automobile interior decoration according to claim 1, characterized in that: The specific material of the base layer (2) is a polypropylene board.

3. The hot-pressed hemp fiber composite board for automobile interior decoration according to claim 1, characterized in that: The specific material of the middle layer (3) is a hemp fiber composite board, the specific material of the top layer (4) is polyvinyl fluoride, and the specific material of the base layer (2) is a high-density fiberboard.

4. The hot-pressed hemp fiber composite board for automobile interior decoration according to claim 1, characterized in that: The specific material of the flame retardant layer (5) is a mixture of a polycarbonate board and a flame retardant.

5. The hot-pressed hemp fiber composite board for automobile interior decoration according to claim 1, characterized in that: The anti-oxidation coating (6) is an ultraviolet absorber.

6. A method for preparing a hot-pressed hemp fiber composite board for automobile interior, characterized in that: The following steps are involved: S1: Preparation of hot pressed hemp fiber composite board; S2: making a flame retardant layer (5); S3: sheet material combination; S4: Finally, an anti-oxidation coating (6) is applied on the top of the flame retardant layer (5).

7. The method for preparing a hot-pressed hemp fiber composite board for automobile interior according to claim 6, characterized in that: In the step S1, hemp fiber is prepared, and the hemp fiber is composed of jute silk and hemp silk, and the ratio is 1-8:2-5. Then epoxy resin is prepared, and the ratio of hemp fiber to epoxy resin is 1-8:2-5. The hemp fiber and epoxy resin are poured into the inner side of the mold for mixing. After the mixing is completed, a hot press is prepared to perform a hot pressing process on the flax fiber and epoxy resin inside the mold, and the parameters are 160-200 degrees Celsius and the pressure is 10-20 MPa to obtain a hot pressed hemp fiber composite board.

8. The method for preparing a hot-pressed hemp fiber composite board for automobile interior decoration according to claim 6, characterized in that: In the step S2, the specific material of the flame retardant layer (5) is a mixture of a polycarbonate board and a flame retardant. The polycarbonate and the flame retardant are prepared and placed in a blender for stirring at a temperature of 80-120 degrees Celsius and a rotation speed of 100-150 revolutions per minute for 5-15 minutes, and then poured into a mold for cooling and forming.

9. The method for preparing a hot-pressed hemp fiber composite board for automobile interior decoration according to claim 6, characterized in that: In the step S3, the base layer (2) is placed on top of the bottom layer (1), the middle layer (3) is placed on top of the base layer (2), the top layer (4) is placed on top of the middle layer (3), and the flame retardant layer (5) is placed on top of the top layer (4). Glue is applied between the layers and compacted. After forming, the layers are cut and polished, trimmed as needed, and burrs are removed to cut into the required size and shape.

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