A method for preparing high-performance plant fiber composites for automotive interiors

Abstract

The application belongs to a kind of preparation method of high-performance plant fiber composite material for automotive interior, comprising sequentially reinforcing treatment, quasi-isotropy treatment and resin composite treatment to plant material, finally obtaining a kind of high-performance plant fiber composite material for automotive interior.The composite material prepared by the method of the application has strength, hardness and toughness beyond traditional plant fiber composite structural parts, and can be comparable to traditional automotive interior organic / inorganic fiber composite materials such as carbon fiber and glass fiber.The method overcomes the problem of insufficient mechanical properties of current plant fiber composite materials and widens the application range of plant fiber composite materials in the field of automotive interior.

Description

Technical Field

[0001] This invention relates to a method for preparing high-performance plant fiber composite materials for automotive interiors. Background Technology

[0002] Currently, in the automotive interior materials industry, plant fibers are typically used as a reinforcing phase to improve the flexural strength and toughness of composite materials. For example, hemp fibers are often used in composites with PET / PP to prepare automotive headliners; bamboo fibers are mixed with resin and molded into door linings. However, compared to composites made from carbon fibers and glass fibers, natural fiber composites in automotive interior materials still suffer from insufficient flexural performance, poor toughness, and low hardness, significantly limiting their application range. To address these issues, measures such as increasing the fiber volume fraction often fail to achieve a balance between various mechanical properties.

[0003] On the other hand, plant fiber composite materials have become ideal alternatives to traditional automotive interior materials such as carbon fiber sheets, fiberglass sheets, and plastic sheets due to their sustainability, low cost, sound insulation, noise reduction, and damping properties. However, the matrix of plant fiber composite materials is still plastic, which inevitably leads to the volatilization of harmful gases such as formaldehyde. In the confined space of a car, these volatile substances can pose a potential health hazard. To avoid this harm, the use of formaldehyde-free composite materials also increases the manufacturing cost of automobiles.

[0004] Therefore, there is an urgent need to develop a method for preparing plant fiber composite materials that combines high strength, high hardness, high toughness, low cost, and ease of use. This represents an exploration of how plant fiber composite materials can fully replace carbon fiber, glass fiber, and other automotive interior materials, and is a breakthrough in all-plant fiber-based automotive interiors, with enormous market potential. Summary of the Invention

[0005] The purpose of this invention is to design a method for preparing a high-performance plant fiber composite material for automotive interiors. This material has high strength, high hardness, and high toughness, comparable to traditional organic / inorganic fiber composite materials such as carbon fiber and glass fiber used in automotive interiors, and also has the advantages of low cost and simple process.

[0006] Therefore, the present invention provides a method for preparing a high-performance plant fiber composite material for automotive interiors, comprising the following steps:

[0007] (1) Preparation of treatment solution: Weigh 0.1-10g of hydroxypropyl cellulose and 0.5-40g of cellulose nanocrystals respectively, mix them and add water to prepare 100mL of treatment solution;

[0008] (2) Weigh a certain amount of air-dried plant fiber material with a moisture content of less than 10% and place it in a potassium hydroxide aqueous solution with a mass fraction of 0.1% to 20%. Heat it in water at 90°C for 1 to 36 hours, then remove it and drain off the water to obtain de-cellulosed plant material.

[0009] (3) Place the de-hemicellulose plant material in the treatment solution and impregnate it under vacuum for 10 min at -0.095 MPa to obtain the treated plant fiber material.

[0010] (4) Take out the above-treated plant fiber material, control the moisture content to 30%, and hot press it at 60-170℃ and 1-25MPa for 0.1-24h to obtain reinforced plant fiber sheet.

[0011] (5) Stack the reinforcing plant fiber sheets, apply resin to the stacked surface, and perform quasi-isotropic or anisotropic cross-assembly according to the staggered joint method of adjacent layers.

[0012] (6) Place the preform in the mold and cure it at 4MPa and 80℃ for 1 to 6 hours to obtain a high-performance plant fiber composite material.

[0013] As a further description of the above technical solution: the plant fiber material is wood, bamboo, hemp, straw or grass, and the wood or bamboo veneer has a thickness of 0.1 to 5 mm.

[0014] Hemp, straw, or grass plants are first longitudinally cut into strips of fiber material with a diameter of 0.5 to 3 mm using a cutting machine, and then woven into woven sheets using a weaving method.

[0015] As a further description of the above technical solution: the treatment solution is a mixed aqueous solution of hydroxypropyl cellulose and cellulose nanocrystals, with mass fractions of 0.1% to 10% and 0.5% to 40%, respectively.

[0016] As a further description of the above technical solution: the homogeneous preforms are preforms made of the same type of material;

[0017] The timber and bamboo materials include single-layer and multi-layer assembly. A single-layer assembly consists of wood or bamboo veneers of the same thickness, joined side by side in width and joined end to end in length, with the joints at the ends in a flat joint. A multi-layer assembly consists of multiple layers of wood or bamboo veneers joined together with staggered joints, with the same thickness of the wood or bamboo veneers in the same layer. The upper and lower adjacent layers are arranged alternately with staggered joints in the same direction, and the longitudinal grains of the upper and lower adjacent layers are staggered at 20° to 90°. Multi-layers are odd numbers and must be at least 3 layers.

[0018] Hemp, straw, or grass plants include single-layer and multi-layer woven sheets. A single-layer woven sheet is formed by interlocking and extending the first layer, with the warp and weft interlacing to widen and lengthen it, forming a woven sheet. A multi-layer woven sheet is formed by stacking at least three layers of woven sheets on top of each other, with the same thickness of the woven sheets in the same layer.

[0019] As a further description of the above technical solution: the aforementioned cross-laminated blanks are blanks with alternating layers of the same type of material and adjacent layers of another type of material; the same type of material is one layer of wood or bamboo sheets, and the other type of material is one or more layers of woven sheets made of hemp, straw, or grass, and the blank assembly form is as follows:

[0020] (1) 3-layer assembly form: wood veneer, one or more layers of woven veneer, wood veneer; or bamboo veneer, one or more layers of woven veneer, bamboo veneer; or wood veneer, one or more layers of woven veneer, bamboo veneer; or bamboo veneer, one or more layers of woven veneer, wood veneer; wherein the longitudinal grains of two wood veneers, or two bamboo veneers, or two bamboo and wood veneers are interlaced at 20° to 90°.

[0021] One or more layers of woven sheets, wood sheets or bamboo sheets; one or more layers of woven sheets;

[0022] (2) The multi-layer odd array blank form is a blank formed by alternating stacking of one layer of wood sheet or one layer of bamboo sheet and one or more layers of woven sheet, wherein the longitudinal grain of two adjacent wood sheets, or two bamboo sheets, or two bamboo and wood sheets are set at 20° to 90°.

[0023] A blank may be assembled by alternating layers of woven sheets and wood sheets or bamboo sheets;

[0024] As a further description of the above technical solution: the resin is a composite resin, which may be epoxy resin, phenolic resin, urea-formaldehyde resin, polylactic acid, or PP.

[0025] As a further description of the above technical solution: the moisture content of the billet is 10-12%.

[0026] The present invention has the following beneficial effects:

[0027] 1. This invention sequentially reinforces, quasi-isotropically treats, and resin-composite treats plant fiber materials to obtain a high-performance plant fiber composite material for automotive interiors. This composite material exhibits mechanical properties surpassing traditional plant fiber composite structural components, achieving a balance of high strength, high hardness, and high toughness. The mechanical properties of the plant fiber composite material prepared using this invention are comparable to those of traditional organic / inorganic fiber composites such as carbon fiber and glass fiber used in automotive interiors. Comparative tests show that the high-performance plant fiber composite material for automotive interiors prepared by this invention has a flexural strength ranging from 111.18 to 239.22 MPa, a Shore hardness ranging from 76.5 to 80.5, and a toughness ranging from 5.5 to 9.6 MJ / cm². 3 The flexural strength of automotive interior carbon fiber composite materials of the same weight and thickness is 193.70 MPa, the Shore hardness is 80.0, and the toughness is 6.4 MJ / cm. 3 Products made of glass fiber composite materials for automotive interiors of the same weight and thickness have a flexural strength of 193.70 MPa, a Shore hardness of 80.0, and a toughness of 6.4 MJ / cm². 3 Products made from bamboo fiber composite materials for automotive interiors of the same weight and thickness have a flexural strength of 79.39 MPa, a Shore hardness of 78.0, and a toughness of 1.3 MJ / cm. 3 .

[0028] The above-mentioned data indicate that the high-strength plant fiber composite board for automotive interiors prepared using the method of this invention has higher bending strength, higher hardness, and higher toughness than traditional plant fiber composite boards, and has mechanical properties comparable to carbon fiber and glass fiber composite boards for automotive interiors. This provides a brand-new solution for creating automotive interior components that are lightweight, high-performance, and fully covered.

[0029] 2. The plant fiber composite material for automotive interiors prepared by this invention greatly reduces the additional chemical substances required for chemical fiber composites, realizes a high-toughness and high-strength material with plant fiber as the matrix, reduces the amount of chemical fiber used, and provides a method for promoting the application of plant waste.

[0030] 3. The preparation method of the present invention solves the problem that current plant fiber composite materials are insufficient to replace all automotive interior materials, and broadens the application of plant fiber composite materials in the field of automotive interiors. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the three-layer preform structure of the present invention;

[0032] Figure 2 This is a schematic diagram of another structure of the three-layer preform of the present invention;

[0033] Figure 3This is a schematic diagram of the 5-layer preform structure of the present invention;

[0034] Figure 4 This is a schematic diagram of the single-layer bamboo strip splicing structure of the present invention;

[0035] Figure 5 This is a schematic diagram of the stamping structure of the blank material according to the present invention. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. To facilitate understanding of the technical means, creative features, and achieved objectives and effects of the present invention, the present invention will be further elaborated below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of the present invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments without creative effort are all within the protection scope of the present invention. Unless otherwise specified, the construction methods in the following embodiments are conventional methods. Unless otherwise specified, the materials, devices, equipment, etc., used in the following embodiments can be obtained commercially.

[0037] Example 1: As Figures 1 to 5 As shown, a method for preparing a high-performance plant fiber composite material for automotive interiors includes the following steps:

[0038] (1) Weigh 0.5g of hydroxypropyl cellulose and 1g of cellulose nanocrystals respectively, mix them and add water to prepare 100mL of treatment solution.

[0039] (2) Weigh a certain amount of air-dried bamboo slices with a thickness of 2 mm, treat them with a 2% potassium hydroxide aqueous solution at 90℃ for 2 hours, drain the solution, place the bamboo slices in the treatment solution, and vacuum impregnate them for 10 minutes at -0.095 MPa.

[0040] (3) Take out the bamboo strips, control the moisture content to 30%, and then hot press them at 140℃ and 8MPa for 0.5h to obtain reinforced bamboo strips.

[0041] like Figure 4 As shown, (4) several pieces of reinforced bamboo strips are coated with epoxy resin on their joint surfaces to form a single layer of bamboo strip 2. The single layer of bamboo strip 2 has the same thickness, and the strips are joined side by side in the same layer and joined end to end in the same direction. The joint 21 of the joint 21 is flat, forming a single layer of bamboo strip 2. Three pieces of single layer bamboo strips are stacked and assembled. The bamboo strips in the same layer have the same thickness. The upper and lower adjacent layers are alternately arranged and the joints in the same direction are staggered. The longitudinal grains of the upper and lower adjacent layers are staggered at 90°, forming a three-layer bamboo strip assembly. The joint surfaces of each layer of bamboo strips are coated with epoxy resin, and the moisture content of the assembly material is 10%.

[0042] (5) The assembled preform 6 is placed in a mold and cured at 4MPa and 80℃ for 1h to obtain a high-performance plant fiber composite material.

[0043] like Figure 5 As shown, the mold includes an upper punch 4 and a lower die 5. The preform 6 is placed on the upper end of the lower die. The pressure is perpendicular to the preform and transmitted to the upper punch 4. The upper punch 4 moves down to press the preform into the lower die 5. It is cured at 4MPa and 80℃ for 1 hour to obtain a one-time formed high-performance plant fiber composite material, which is then trimmed to form the product.

[0044] The sample obtained in Example 1 was tested and found to have a flexural strength of 239.22 MPa, a Shore hardness of 78.5, and a toughness of 9.6 MJ / cm. 3 .

[0045] Example 2: A method for preparing a high-performance plant fiber composite material for automotive interiors, comprising the following steps:

[0046] 0.2g of hydroxypropyl cellulose and 0.5g of cellulose nanocrystals were weighed separately, mixed, and water was added to prepare a 100mL treatment solution. A certain amount of 2mm thick forged wood chips was weighed, and hydrothermally treated in a 2% potassium hydroxide aqueous solution at 90℃ for 1 hour. After draining the solution, the forged wood chips were placed in the treatment solution and vacuum-impregnated at -0.095MPa for 10 minutes. The forged wood chips were then removed, and the moisture content was controlled to 30%. They were then hot-pressed at 80℃ and 20MPa for 12 hours to obtain reinforced forged wood chips. Several reinforced forged wood chips were coated with epoxy resin on their joint surfaces to form a single layer of preform. Each preform consisted of a single layer of forged wood chips of the same thickness, joined side-by-side in width, and joined longitudinally end-to-end. The longitudinal joints were joined with a flat joint to form a single layer of forged wood chips. Three layers of forged wood veneer were stacked and assembled into a preform. The thickness of each layer of forged wood veneer was the same. Adjacent layers were alternately arranged with staggered seams in the same direction. The longitudinal grains of adjacent layers were interlaced at 70° intervals, forming a three-layer forged wood veneer preform. The mating surfaces of each layer were coated with epoxy resin. The moisture content of the preform was 10%. The assembled preform was placed in a mold and cured at 4 MPa and 80°C for 2 hours to obtain a high-performance plant fiber composite material.

[0047] The sample obtained in Example 2 was tested and found to have a flexural strength of 193.46 MPa, a Shore hardness of 80.5, and a toughness of 5.5 MJ / cm. 3 .

[0048] Example 3: Unlike Example 1, a certain amount of fiber material was weighed and longitudinally cut into strips with a diameter of 1-3 mm using a cutting machine. The air-dried wheat straw strips were woven into woven sheets and placed in a 2% potassium hydroxide aqueous solution. After hydrothermal treatment at 90°C for 1 hour, the solution was drained, and the woven sheets were placed in the treatment solution and vacuum impregnated at -0.095 MPa for 10 minutes. The woven sheets were then removed, and the moisture content was controlled at 30%. They were then hot-pressed at 80°C and 20 MPa for 12 hours to obtain reinforced woven sheets. Three layers of woven sheets were stacked to form a preform. The assembled straw was placed in a mold and cured at 4 MPa and 80°C for 1 hour to obtain a high-performance plant fiber composite material.

[0049] The sample obtained in Example 3 was tested and found to have a flexural strength of 119.27 MPa, a Shore hardness of 77.5, and a toughness of 6.8 MJ / cm. 3 .

[0050] Example 4: Unlike Example 1, a certain amount of air-dried Napier grass was weighed and woven into 3cm x 3cm mats. The mats were placed in a 2% potassium hydroxide aqueous solution, heated to 90°C, and hydrothermally treated for 1 hour. After draining the solution, the mats were placed in the treatment solution and vacuum-impregnated at -0.095MPa for 10 minutes. The mats were then removed, and the moisture content was controlled to 30%. They were then hot-pressed at 80°C and 20MPa for 12 hours to obtain reinforced mat 3. Three layers of mats were stacked and assembled, with each layer coated with phenolic resin. The assembled mats were placed in a mold and cured at 4MPa and 80°C for 1 hour to obtain a high-performance plant fiber composite material.

[0051] The sample obtained in Example 4 was tested and found to have a flexural strength of 111.18 MPa, a Shore hardness of 76.5, and a toughness of 7.6 MJ / cm. 3 .

[0052] Example 5: Figure 1 As shown, the reinforced forged wood chips obtained in Example 2 and the reinforced straw mat obtained in Example 4 were assembled into a three-layer preform, forming a three-layer preform consisting of one layer of wood chip 1, two layers of woven sheet 3, and one layer of wood chip. The longitudinal grains of the two wood chip layers are staggered at 90°. The mating surfaces of each layer are coated with epoxy resin, and the moisture content of the preform is 12%. The preform is placed in a mold and cured at 4 MPa and 80°C for 2 hours to obtain a high-performance plant fiber composite material.

[0053] The sample obtained in Example 5 was tested and found to have a flexural strength of 190.5 MPa, a Shore hardness of 79.5, and a toughness of 5.1 MJ / cm. 3 .

[0054] Example 6: As Figure 2 As shown, the reinforced bamboo strips 2 obtained in Example 1, the reinforced wrought wood strips obtained in Example 2, and the reinforced straw mat obtained in Example 4 were assembled into a three-layer structure, forming a three-layer structure consisting of one layer of wood strips 1, two layers of woven sheets 3, and one layer of bamboo strips 1. The longitudinal grains of the wood strips and bamboo strips are staggered at 90°. The mating surfaces of each layer are coated with epoxy resin, and the moisture content of the assembled material is 11%. The assembled material is placed in a mold and cured at 4 MPa and 80°C for 2 hours to obtain a high-performance plant fiber composite material.

[0055] The sample obtained in Example 6 was tested and found to have a flexural strength of 230.6 MPa, a Shore hardness of 74.1, and a toughness of 8.1 MJ / cm. 3 .

[0056] Example 7: Figure 2 As shown, the reinforced bamboo strips 2 obtained in Example 1, the reinforced wrought wood strips obtained in Example 2, and the reinforced straw mat obtained in Example 4 were assembled into a 5-layer structure, forming a 5-layer structure consisting of one layer of wood strips 1, two layers of woven sheets 3, one layer of bamboo strips 2, two layers of woven sheets 3, and one layer of wood strips 1. The longitudinal grains of adjacent wood strips and bamboo strips are staggered at 90°. The mating surfaces of each layer are coated with epoxy resin, and the moisture content of the assembled material is 10%. The assembled material is placed in a mold and cured at 4 MPa and 80°C for 2 hours to obtain a high-performance plant fiber composite material.

[0057] Comparative Example 1: The preparation of the comparative example of carbon fiber composite material for automotive interiors includes the following steps: Purchasing carbon fiber woven fabric is coated with epoxy resin on both sides and then assembled into a quasi-isotropic preform according to the method described in Example 1. The assembled carbon fiber fabric is placed in a mold and cured at 1 MPa and 80°C for 1 hour to obtain a comparative sample of carbon fiber composite material.

[0058] The sample obtained in Comparative Example 1 was tested and found to have a flexural strength of 83.78 MPa, a Shore hardness of 79.5, and a toughness of 4.9 MJ / cm². 3 .

[0059] Comparative Example 2: The preparation of the comparative example of glass fiber composite material for automotive interiors includes the following steps: Purchased glass fiber woven fabric is coated with epoxy resin on both sides and then assembled in a quasi-isotropic manner as described in Example 1. The assembled carbon fiber fabric is placed in a mold and cured at 1 MPa and 80°C for 1 hour to obtain a comparative sample of carbon fiber composite material.

[0060] The sample obtained in Comparative Example 2 was tested and found to have a flexural strength of 193.70 MPa, a Shore hardness of 80.0, and a toughness of 6.4 MJ / cm². 3 .

[0061] Comparative Example 3: The preparation of the comparative example of bamboo fiber composite material for automotive interiors includes the following steps: thoroughly mixing bamboo fiber with epoxy resin. Placing the bamboo fiber in a mold and curing it at 1 MPa and 80°C for 1 hour to obtain a comparative sample of ordinary bamboo fiber composite material.

[0062] The sample obtained in Comparative Example 3 was tested and found to have a flexural strength of 79.39 MPa, a Shore hardness of 78.0, and a toughness of 1.3 MJ / cm. 3 .

[0063] Test Comparison Table 1:

[0064]

[0065] The test data above demonstrate that the high-strength plant fiber composite board for automotive interiors prepared using the method of this invention has superior bending strength, hardness, and toughness compared to traditional plant fiber composite boards, and mechanical properties comparable to carbon fiber and glass fiber composite boards for automotive interiors. This provides a novel solution for creating automotive interior components that utilize fewer chemical fibers and plant fibers, turn waste into treasure, and combine lightweight, high performance, and full coverage.

[0066] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for the production of high-performance plant fiber composites for automotive interiors, characterized in that, It comprises the following steps: (1) Preparation of treatment solution: 0.1-10 g of hydroxypropyl cellulose and 0.5-40 g of cellulose nanocrystals are weighed respectively, mixed and added with water to prepare 100 mL of treatment solution; (2) A certain amount of air-dried plant fiber material with a moisture content of less than 10% is weighed and placed in a 0.1%-20% potassium hydroxide aqueous solution at 90°C for 1-36 h, then taken out and drained to obtain a hemicellulose-removed plant material; The plant fiber material is wood, bamboo, hemp, straw or grass plant, and the thickness of the wood and bamboo is 0.1-5 mm; The hemp, straw or grass plant is longitudinally cut into 0.5-3 mm diameter fiber material by a cutting machine, and then woven into a woven sheet; (3) The hemicellulose-removed plant material is placed in the treatment solution and vacuum impregnated at -0.095 MPa for 10 min to obtain a treated plant fiber material; (4) The treated plant fiber material is taken out and the moisture content is controlled at 30%, and then hot-pressed at 60-170°C and 1-25 MPa for 0.1-24 h to obtain a reinforced plant fiber sheet; (5) The reinforced plant fiber sheets are stacked, the stacking surface is coated with resin, and quasi-isotropic assembly, isotropic assembly and cross assembly are carried out in the manner of staggered joints between adjacent layers; The isotropic assembly is an assembly of the same type of material; The wood and bamboo include one-layer assembly and multi-layer assembly, the one-layer assembly is a wood sheet or bamboo sheet with the same thickness, and the same layer is connected in parallel and longitudinally connected end to end, and the longitudinal end-to-end joint is flat joint; the multi-layer assembly is a multi-layer wood sheet or bamboo sheet, and the upper and lower adjacent layers are alternately arranged and staggered in the same direction, and the upper and lower adjacent layers are longitudinally arranged at an angle of 20°-90°, and the number of layers is odd and at least 3; The hemp, straw or grass plant includes one-layer assembly and multi-layer assembly, the one-layer assembly is a first layer connected end to end, and the warp and weft are cross-woven to expand the width and length to form a woven sheet; the multi-layer assembly is at least 3 layers of woven sheets stacked together; The cross assembly is an assembly of the same type of material in the same layer and another type of material in the adjacent layer; the same type of material is a wood sheet or bamboo sheet, and the other type of material is a one-layer or multi-layer woven sheet of hemp, straw or grass plant; (6) The assembly material is placed in a mold and cured at 4 MPa and 80°C for 1-6 h to obtain a high-performance plant fiber composite material.

2. A process for the production of high performance plant fiber composites for automotive interiors according to claim 1, characterized in that: The treatment solution is a mixed aqueous solution of hydroxypropyl cellulose and cellulose nanocrystals with a mass fraction of 0.1%-10% and 0.5%-40%, respectively.

3. A process for the preparation of high performance plant fiber composites for automotive interiors as claimed in claim 1, wherein: The cross assembly is an assembly of the same type of material in the same layer and another type of material in the adjacent layer; the same type of material is a wood sheet or bamboo sheet, and the other type of material is a one-layer or multi-layer woven sheet of hemp, straw or grass plant, and the assembly form is (1) 3 layers of group blank form: wood sheet, one or more layers of woven sheet, wood sheet; or bamboo sheet, one or more layers of woven sheet, bamboo sheet; or wood sheet, one or more layers of woven sheet, bamboo sheet; or bamboo sheet, one or more layers of woven sheet, wood sheet; wherein two wood sheets, or two bamboo sheets, or two bamboo-wood sheets are set with longitudinal grain lines staggered at 20°-90°; or one or more layers of woven sheet, wood sheet or bamboo sheet, one or more layers of woven sheet; (2) Multi-layered odd group blank form is a group blank with one layer of wood sheet or one layer of bamboo sheet and one or more layers of woven sheet alternately stacked, wherein the upper and lower two adjacent wood sheets, or two bamboo sheets, or two bamboo-wood sheets are set with longitudinal grain lines staggered at 20°-90°; or one or more layers of woven sheet and one layer of wood sheet or one layer of bamboo sheet alternately stacked group blank.

4. A process for the preparation of high performance plant fiber composites for automotive interiors as claimed in claim 1, wherein: The resin is epoxy resin, phenolic resin, urea-formaldehyde resin, polylactic acid, PP.

5. A process for the preparation of high performance plant fiber composites for automotive interiors as claimed in claim 1, wherein: The moisture content of the group blank material is 10-12%.

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