A continuous plant ply fiber-reinforced aqueous resin prepreg and a method for preparing the same

Abstract

The application discloses a continuous plant sheet layer fiber reinforced water-based resin prepreg and a preparation method thereof, and belongs to the field of polymer composite material processing. The application comprises impregnation and pre-curing treatment, and the sheet layer fiber raw material is pretreated to obtain modified sheet layer fiber which is continuously extended along the natural tissue growth direction of the plant, and has an impregnation channel structure on the surface and / or inside; the modified sheet layer fiber is impregnated with a water-based resin system, and after glue control and drying, pre-curing is performed to obtain a prepreg which is in a semi-cured state, can be stored and layered, and can be further laminated and formed. The application forms an impregnation channel structure on the surface and / or inside of the continuous plant sheet layer fiber material, can improve the penetration ability of the water-based resin system into the inside of the sheet layer fiber, is beneficial to reducing the problems of surface resin enrichment and internal insufficient impregnation, and improves the resin distribution uniformity. The prepared prepreg can be used in the fields of building decoration, household products, packaging materials, rail transit and automobile interior decoration.

Description

Technical Field

[0001] This invention belongs to the field of polymer composite material processing technology, specifically relating to a continuous plant lamella fiber reinforced waterborne resin prepreg and its preparation method. Background Technology

[0002] Continuous plant-derived layered fiber materials are a class of bio-based materials derived from natural plant tissues, extending continuously along the natural growth direction of plant cells, vessels, vascular bundles, and / or fiber tissues, and possessing a layered structure. These materials are typically produced from plant raw materials such as wood, bamboo, and rattan through methods such as rotary cutting, planing, flattening, splitting, or directional dissociation. Due to the high orientation and continuity of their internal natural tissues along the growth direction, they can serve as reinforcements in laminated composite materials. Resins can be used for impregnation, bonding, and composite molding of plant-derived layered materials. Among them, water-based resins, using water as the dispersion medium, offer advantages such as system tunability, high process safety, and environmental friendliness, making them suitable for the composite processing of plant-derived materials.

[0003] In existing technologies, for natural fiber-reinforced prepregs or laminated composites, wood or other plant-derived materials are typically treated through methods such as decomponent removal, softening, loosening, densification, reconstructing, or paperization to transform them into wood fiber paper, fiber felt, or similar reconstituted sheet materials, which are then compounded with a resin system to prepare prepregs or laminated composites. In these technical routes, the morphology of the reinforcing phase differs from that of directional continuous plant-derived layered materials that maintain a continuous structure along their natural growth direction, and the processing steps are numerous and the process is relatively complex. For technical solutions that directly use continuous plant sheet fiber reinforcement materials with a resin system to prepare prepregs, these materials exhibit significant anisotropy. Their thickness-direction microstructure restricts resin penetration, easily leading to surface enrichment and insufficient internal wetting. Simultaneously, uneven resin distribution or migration during impregnation, resin control, and drying processes can cause material warping, weak interfacial bonding, and fluctuations in resin content, thereby affecting the quality stability of the prepreg and the subsequent lamination molding effect. Furthermore, in the absence of structural designs or pretreatment methods that promote resin penetration into the continuous plant lamellae fibers, there is often a contradiction between resin viscosity and impregnation effect. While low-viscosity resins are beneficial for penetration, the resin retention is low, making it difficult to consistently obtain high resin content; while high-viscosity resins are beneficial for increasing resin retention, their internal penetration capacity is insufficient, easily leading to inadequate wetting.

[0004] Therefore, existing technologies still struggle to simultaneously achieve adequate impregnation of plant-derived layered materials, control of resin content, and maintenance of the stability of prepregs during subsequent molding. Summary of the Invention

[0005] One technical problem solved by this invention is to provide a method for preparing a continuous plant lamella fiber reinforced waterborne resin prepreg. This method, through the combination of impregnation, resin control, drying, and pre-curing treatment, enables the obtained prepreg to achieve good internal impregnation effect, resin content control, storage stability, and adaptability to subsequent lay-up and lamination molding. Another technical problem to be solved by this invention is to provide a continuous plant lamella fiber reinforced waterborne resin prepreg, which can be further laminated to prepare composite materials. The performance of the obtained composite materials can be controlled as needed through multi-layer and variable-angle lay-up.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0007] A method for preparing a continuous plant sheet fiber reinforced waterborne resin prepreg includes impregnation and pre-curing treatment. The sheet fiber raw material is pretreated to obtain modified sheet fibers with continuous extension along the natural growth direction of the plant tissue and impregnation channel structure on the surface and / or inside. The modified sheet fibers are impregnated and compounded with a waterborne resin system, and then pre-cured after controlled adhesive application and drying to obtain a semi-cured prepreg that can be stored, laid up, and further laminated.

[0008] Furthermore, the thickness of the sheet fiber raw material is 0.1~5.00mm, and the sheet fiber raw material is selected from one or more of wood veneer, bamboo veneer, bamboo strips, and rattan.

[0009] Furthermore, the impregnation channel structure is one or more combinations of micropores, microcracks, grooves, embossing, and exposed conduit areas; the pretreatment is one or more of mechanical roughening, embossing, microwave treatment, plasma treatment, and corona treatment.

[0010] Furthermore, the waterborne resin system is one or more of the following: waterborne epoxy resin system, waterborne polyurethane resin system, and waterborne phenolic resin system.

[0011] Furthermore, the water-based resin impregnation liquid used for impregnation has a solid content of 10~60wt% and a viscosity controlled at 20~2000mPa·s; the final prepreg has an overall resin content of 5~40wt%.

[0012] Furthermore, the preparation method of the continuous plant-based fiber-reinforced waterborne resin prepreg includes the following steps:

[0013] 1) Modified sheet fibers are obtained by pretreatment of sheet fiber raw materials, which have continuous extension along the natural growth direction of plant tissue and impregnation channel structure on the surface and / or inside;

[0014] 2) Prepare the water-based resin impregnation solution;

[0015] 3) The modified sheet fibers with impregnation channel structure are combined with the impregnation liquid for impregnation, so that the resin impregnates the modified sheet fibers;

[0016] 4) Implement adhesive control treatment on the impregnated modified sheet fibers;

[0017] 5) After controlling the adhesive, the modified sheet fibers are dried and pre-cured at 40~100℃ for 30~90min to obtain continuous plant sheet fiber reinforced waterborne resin prepreg.

[0018] Further, in step 3), the composite wetting method is one or more of spraying, dipping, roller coating, scraping, and vacuum-assisted impregnation; in step 4), the adhesive control method is scraper adhesive control, roller pressure adhesive control, or a combination of scraper and roller pressure adhesive control.

[0019] Furthermore, the continuous plant sheet fiber reinforced waterborne resin prepreg prepared by the aforementioned method is a continuous plant sheet fiber reinforced waterborne resin prepreg.

[0020] Furthermore, the application of the continuous plant-based fiber-reinforced waterborne resin prepreg in the preparation of laminated composite materials.

[0021] Furthermore, the multi-layer prepreg is laid in an alternating manner at a preset angle, and then hot-pressed and fully cured to obtain the finished laminated composite material.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] (1) The present invention uses continuous plant sheet fibers as reinforcement. Without papering or reconstructing them, the structural characteristics of the natural tissue of plant fibers extending continuously along the growth direction are preserved, which is conducive to exerting their reinforcing effect.

[0024] (2) By forming an impregnation channel structure on the surface and / or inside of the continuous plant sheet fiber material, the present invention can improve the penetration ability of the water-based resin system into the sheet fiber, which is beneficial to alleviate the problems of surface resin enrichment and insufficient internal wetting, and improve the uniformity of resin distribution.

[0025] (3) The present invention, through the combination of impregnation, glue control, drying and pre-curing treatment, can make the obtained prepreg have the same effect as internal impregnation, glue content control, storage stability and subsequent lay-up and lamination molding adaptability.

[0026] (4) The prepreg obtained by the present invention can be further laminated to prepare composite materials. The performance of the obtained composite materials can be controlled by multi-layer and variable angle layup as needed, and is suitable for building decoration, home furnishing products, packaging materials, rail transit and automotive interiors. Attached Figure Description

[0027] Figure 1 Scanning electron microscope images of untreated poplar veneer (a) and plasma-treated poplar veneer (b) in this application;

[0028] Figure 2 This is a photograph of the poplar veneer prepreg prepared in Example 1 of this application;

[0029] Figure 3 This is a cross-sectional electron microscope image of poplar veneer and prepreg from Example 1 of this application;

[0030] Figure 4 Infrared spectra of the prepreg prepared in Example 1 of this application and the laminated composite material prepared in Application Example 1;

[0031] Figure 5 This is a physical image of the laminated composite material prepared in Application Example 1 of this application. Detailed Implementation

[0032] The present invention will be further illustrated below with reference to specific embodiments. These embodiments are implemented based on the technical solutions of the present invention, and it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0033] In the following examples, continuous plant sheet fibers refer to materials derived from natural plant tissues that extend continuously along the natural growth direction of plant cells, vessels, vascular bundles, and / or fibrous tissues and have a sheet structure.

[0034] Impregnation channel structures refer to structures formed on the surface and / or inside of continuous plant lamellae fibers that can promote the penetration of aqueous resin systems along the thickness direction and / or the planar direction.

[0035] Aqueous resin systems refer to resin systems that use water as a dispersion medium or continuous phase, can impregnate continuous plant sheet fibers, and are then dried and pre-cured to form a pre-impregnated state.

[0036] The semi-cured state refers to the state in which the water-based resin system, after drying and pre-curing, is ready for storage, lay-up, and further thermosetting and curing. In this state, the prepreg contains a resin system that has been impregnated into the reinforcing material and has a certain degree of flexibility and subsequent thermosetting capability.

[0037] The bisphenol A type waterborne epoxy resin emulsions in the following examples were prepared using the method described in Example 3 of Chinese Invention Patent Publication No. CN112979993A: A Two-Step Method for Preparing Waterborne Epoxy Resin Emulsions.

[0038] The waterborne polyurethane system in the following examples was prepared using the method described in the journal article (Wu G, Chen J, Yang Z, et al. Preparation and properties of autocatalytic biobased waterborne polyol from rosin based epoxy resin[J]. Journal of Polymers and the Environment, 2022, 30(8): 3340-3350.).

[0039] In the following application examples, the bending performance test shall be performed in accordance with GB / T 1449-2005: Test method for bending performance of fiber reinforced plastics, and the tensile performance test shall be performed in accordance with GB / T 1040.4-2006: Test method for tensile properties of plastics.

[0040] Example 1

[0041] A method for preparing a continuous plant-based fiber-reinforced waterborne resin prepreg includes the following steps:

[0042] (1) Poplar veneer with a thickness of 0.30 mm was selected as a continuous plant veneer fiber material and cut into 200 mm pieces along the parallel and perpendicular directions of the wood grain. 25cm sheets were dried at 80℃ for 4 hours.

[0043] (2) The surface of poplar veneer was activated and etched by a CIF plasma machine (Huayixing (Beijing) Technology Co., Ltd., model SPB5). The processing parameters were: power 200W, air atmosphere, and processing time 360s. This process was used to create a roughened structure on the surface of the poplar veneer to construct an impregnation channel structure that facilitates the penetration of water-based resin.

[0044] (3) The bisphenol A type waterborne epoxy resin emulsion and the amine curing agent (diethyltoluene diamine, purchased from BASF New Materials Co., Ltd.) were mixed at a mass ratio of 100:6 and stirred evenly to obtain the waterborne epoxy resin system impregnation liquid; the solid content of the impregnation liquid was 30wt% and the viscosity was 180mPa·s.

[0045] (4) Immerse the treated poplar veneer in water-based epoxy resin impregnation solution and impregnate for 10 minutes under vacuum conditions to allow the water-based epoxy resin to fully penetrate the poplar veneer.

[0046] (5) Roller press the impregnated poplar veneer to control the glue content. Process parameters: roller speed 2m / min, line pressure 100N / cm, roller press twice to remove excess resin and adjust the glue content.

[0047] (6) First, dry at 80℃ for 60 min, then pre-cur at 80℃ for 30 min to obtain poplar veneer water-based epoxy prepreg (e.g. Figure 2 (As shown).

[0048] Depend on Figure 1 A comparison of scanning electron microscope images of untreated poplar veneer and plasma-treated poplar veneer shows that the untreated poplar veneer (a) has a relatively smooth fiber surface with fewer pores and cracks; after plasma treatment (b), a large number of exposed vascular pores and microcracks appear inside the veneer, the fiber surface is roughened, and impregnation channels that can be made available for resin wetting are constructed, which is conducive to the subsequent penetration of water-based resin into the interior of the veneer and improves the resin-fiber interface bonding effect.

[0049] Calculations showed that the resin content of the obtained prepreg was 21 wt%. Cross-sectional observation revealed... Figure 3 The water-based epoxy resin forms a continuous penetration zone in the thickness direction of the poplar veneer. The resulting prepreg exhibits good flexibility and adaptability to subsequent lay-up.

[0050] Example 2

[0051] A method for preparing a continuous plant-based fiber-reinforced waterborne resin prepreg includes the following steps:

[0052] (1) Select bamboo skin with a thickness of 0.20 mm as continuous plant sheet fiber, and cut it into 200 mm pieces along the parallel and perpendicular natural growth direction. 25cm sheets were dried at 80℃ for 3 hours.

[0053] (2) First, roughen the surface of the bamboo skin with an embossing roller: texture depth 50μm, pitch 200μm, linear pressure 30N / cm, linear speed 1m / min to form regular grooves; then perform corona treatment: power 500W, discharge distance 1cm, air atmosphere, treatment time 60s to improve surface wettability and construct impregnation channels.

[0054] (3) The bisphenol A type waterborne epoxy resin emulsion and the amine curing agent (polyetheramine D230, purchased from BASF New Materials Co., Ltd.) were mixed at a mass ratio of 100:8 and stirred evenly to obtain the waterborne epoxy resin system impregnation liquid; the solid content of the impregnation liquid was 30wt% and the viscosity was 180mPa·s.

[0055] (4) The treated bamboo skin is brought into contact with the water-based epoxy resin impregnation liquid by immersion for 2 minutes, so that the resin can penetrate from the surface of the bamboo skin into the interior.

[0056] (5) Use a combination of scraper and roller to control the glue: scraper gap 0.12mm, scraper angle 45°; roller linear speed 2m / min, linear pressure 120N / cm, roller press once to remove excess resin and make it evenly distributed.

[0057] (6) First dry at 60℃ for 30 min, then pre-cur at 70℃ for 40 min to obtain bamboo skin waterborne epoxy prepreg.

[0058] The calculated resin content of the prepreg is 23 wt%. The resulting prepreg exhibits good flexibility and adaptability to subsequent lay-up.

[0059] Example 3

[0060] A method for preparing a continuous plant-based fiber-reinforced waterborne resin prepreg includes the following steps:

[0061] (1) Select 0.4mm thick ash veneer as continuous plant lamella fiber material, and cut it into 200mm pieces along the parallel and perpendicular directions of the wood grain. 25cm sheets were dried at 60℃ for 2.5 hours.

[0062] (2) The combined pretreatment of embossing and plasma is adopted. The parameters of the embossing roller are: 50 μm depth, 150 μm pitch, 30 N / cm linear pressure and 0.5 m / min linear speed. The plasma treatment is: 150 W power, nitrogen atmosphere and 480 s time to improve surface activity and construct impregnation channels.

[0063] (3) Water-based polyurethane was used as the impregnation liquid with a solid content of 35wt% and a viscosity of 450mPa·s.

[0064] (4) Immerse the treated ash wood veneer in water-based polyurethane impregnation solution for 4 minutes under normal pressure to allow the water-based polyurethane to penetrate into the veneer.

[0065] (5) Adopt roller pressing to control glue: roller linear speed 2m / min, linear pressure 180N / cm, roller pressing once, adjust the surface resin content and overall glue content.

[0066] (6) First dry at 55℃ for 10 min, then pre-cur at 65℃ for 50 min to obtain waterborne polyurethane prepreg for ash wood veneer.

[0067] Calculations show that the resin content of the obtained prepreg is 25 wt%. The obtained prepreg exhibits good flexibility and adaptability to subsequent lay-up.

[0068] Example 4

[0069] A method for preparing a continuous plant-based fiber-reinforced waterborne resin prepreg includes the following steps:

[0070] (1) Select bamboo strips with a thickness of 1 mm as continuous plant sheet fiber material, and cut them into 100 mm pieces along the parallel and perpendicular natural growth directions. A 10cm sheet was dried at 60℃ for 4 hours.

[0071] (2) Mechanical roughening and microwave combined pretreatment are adopted. First, the surface is polished with 240-grit sandpaper to form a micro-rough structure; then microwave treatment is performed: frequency 2450MHz, power 500W, time 120s to promote the formation of impregnation channels.

[0072] (3) Aqueous phenolic resin (purchased from Jinan Shengquan Group Co., Ltd.) was used as impregnation liquid with a solid content of 28wt% and a viscosity of 220mPa·s.

[0073] (4) Place the treated bamboo strips in a vacuum-assisted impregnation device and impregnate for 5 minutes at a gauge pressure of -0.1 MPa. The water-based phenolic resin will penetrate into the interior under the action of pressure difference.

[0074] (5) Roller pressing for glue control: roller speed 2m / min, line pressure 150N / cm, roller pressing 3 times to remove excess resin and adjust glue content.

[0075] (6) First dry at 50℃ for 40 min, then pre-cur at 55℃ for 80 min to obtain water-based phenolic prepreg for bamboo strips.

[0076] The calculated resin content of the prepreg is 16 wt%. The resulting prepreg exhibits good flexibility and adaptability to subsequent lay-up.

[0077] Example 5

[0078] A method for preparing a continuous plant-based fiber-reinforced waterborne resin prepreg includes the following steps:

[0079] (1) Select 2mm thick rattan sheets as oriented continuous plant-derived layered substrates, and cut them into 100mm pieces along the parallel and perpendicular natural growth directions. A 10cm sheet was dried at 55℃ for 3 hours.

[0080] (2) Pretreatment with a combination of corona and mechanical roughening: First, lightly polish the two surfaces with 240-grit sandpaper; then corona treatment: power 500W, discharge distance 20mm, air atmosphere, time 4min, to improve surface activity and construct impregnation channels.

[0081] (3) A water-based polyurethane system was used as the impregnation liquid, with a solid content of 32wt% and a viscosity of 380mPa·s.

[0082] (4) Immerse the treated rattan sheet in the water-based polyurethane impregnation solution and impregnate for 4 minutes under normal pressure to allow the water-based polyurethane to penetrate into the rattan sheet.

[0083] (5) Use a combination of scraper and roller to control the glue content: scraper gap 0.12mm, scraper angle 45°; roller linear speed 2m / min, linear pressure 150N / cm, roller press 3 times to remove excess resin and adjust glue content.

[0084] (6) First dry at 50℃ for 15 min, then pre-cur at 60℃ for 45 min to obtain waterborne polyurethane prepreg for rattan sheets.

[0085] The calculated resin content of the prepreg is 18 wt%. The resulting prepreg exhibits good flexibility and adaptability to subsequent layup.

[0086] The performance of the prepregs prepared in Examples 1-5 was compared, and the results are shown in Table 1. The prepregs were stored at -18°C and below, and their storage stability and paving adaptability were evaluated periodically. The resin content was determined by weighing. The tensile strength and tensile modulus were determined according to GB / T 1040.3-2006, and the resin distribution in the cross-section was observed by scanning electron microscopy.

[0087] Table 1 Performance parameters of the prepregs prepared in Examples 1-5

[0088]

[0089] As shown in Table 1, the impregnation channel helps to promote the migration of waterborne resin into the interior of the layered reinforcing material, improves the resin distribution, and gives the prepreg good storage, laying and subsequent lamination properties.

[0090] Application Example 1

[0091] The preparation of poplar veneer waterborne epoxy prepreg laminate composite material includes the following steps:

[0092] The continuous poplar fiber waterborne epoxy prepreg prepared in Example 1 was used as raw material and cut into 20cm pieces. A 20cm sheet is laid up in a manner that intersects the natural growth direction of adjacent layers at an angle of 90° to obtain a layup.

[0093] In this application example, the number of layup layers is 15. The resulting layup is placed in a flatbed hot press and hot-pressed at 160°C and 4MPa for 30 minutes to obtain the laminated composite material.

[0094] Depend on Figure 4 The infrared spectrum shows that after hot pressing, the composite material is located at 914 cm⁻¹. -1The disappearance of the characteristic absorption peak of the epoxy group at the point indicates that the epoxy group has undergone a significant ring-opening reaction and completed curing.

[0095] Depend on Figure 5 It can be seen that the obtained laminated composite material has a good molding state, the surface of the board is flat, the interlayer bonding is excellent, and no delamination or warping is observed.

[0096] Performance testing showed that the obtained laminated composite material had good flexural properties (220 MPa) and tensile properties (113 MPa), indicating that the prepreg obtained in Example 1 is suitable for preparing laminated composite materials.

[0097] Application Example 2

[0098] The preparation of bamboo veneer waterborne epoxy prepreg laminate composite material includes the following steps:

[0099] Using the bamboo veneer waterborne epoxy prepreg prepared in Example 2 as raw material, it was cut into 20 pieces. A 20cm sheet is laid up in a manner that intersects the natural growth direction of adjacent layers at an angle of 90° to obtain a layup.

[0100] In this application example, the number of layup layers is 10. The resulting layup is placed in a flatbed hot press and hot-pressed at 125°C and 4MPa for 25 minutes, then held under pressure and cooled to room temperature to obtain the laminated composite material.

[0101] Visual inspection revealed that the obtained laminated composite material was in good molding condition, with a smooth surface, excellent interlayer bonding, and no delamination or warping.

[0102] Performance tests showed that the flexural strength of the obtained laminated composite material was 182 MPa and the tensile strength was 101 MPa, indicating that the prepreg obtained in Example 2 is suitable for preparing laminated composite materials.

[0103] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be included within the protection scope of the present invention.

Claims

1. A method for preparing a continuous plant-based fiber-reinforced waterborne resin prepreg, comprising impregnation and pre-curing treatments, characterized in that: Modified sheet fibers are obtained by pretreatment of sheet fiber raw materials, which have continuous extension along the natural growth direction of plant tissue and impregnation channel structure on the surface and / or inside; the modified sheet fibers are impregnated and compounded with an aqueous resin system, and then pre-cured after control of adhesive application and drying to obtain a semi-cured prepreg that can be stored, laid up, and further laminated.

2. The method for preparing continuous plant-based fiber-reinforced waterborne resin prepreg according to claim 1, characterized in that: The thickness of the sheet fiber raw material is 0.1~5.00mm, and the sheet fiber raw material is selected from one or more of wood veneer, bamboo veneer, bamboo strips, and rattan.

3. The method for preparing continuous plant-based fiber-reinforced waterborne resin prepreg according to claim 1, characterized in that: The impregnation channel structure is one or more of the following: micropores, microcracks, grooves, embossing, and exposed conduit area; the pretreatment is one or more of the following: mechanical roughening, embossing, microwave treatment, plasma treatment, and corona treatment.

4. The method for preparing continuous plant-based fiber-reinforced waterborne resin prepreg according to claim 1, characterized in that: The waterborne resin system is one or more of the following: waterborne epoxy resin system, waterborne polyurethane resin system, and waterborne phenolic resin system.

5. The method for preparing continuous plant-based fiber-reinforced waterborne resin prepreg according to claim 1, characterized in that: The water-based resin used for impregnation has a solid content of 10-60 wt% and a viscosity controlled at 20-2000 mPa·s; the final prepreg has an overall resin content of 5-40 wt%.

6. The method for preparing continuous plant-based fiber-reinforced waterborne resin prepreg according to claim 1, characterized in that: Includes the following steps: 1) Modified sheet fibers are obtained by pretreatment of sheet fiber raw materials, which have continuous extension along the natural growth direction of plant tissue and impregnation channel structure on the surface and / or inside; 2) Prepare the water-based resin impregnation solution; 3) The modified sheet fibers with impregnation channel structure are combined with the impregnation liquid for impregnation, so that the resin impregnates the modified sheet fibers; 4) Implement adhesive control treatment on the impregnated modified sheet fibers; 5) After controlling the adhesive, the modified sheet fibers are dried and pre-cured at 40~100℃ for 30~90min to obtain continuous plant sheet fiber reinforced waterborne resin prepreg.

7. The method for preparing continuous plant-based fiber-reinforced waterborne resin prepreg according to claim 6, characterized in that: In step 3), the composite wetting method is one or more of spraying, dip coating, roller coating, scraping, and vacuum-assisted impregnation; in step 4), the adhesive control method is scraper adhesive control, roller pressure adhesive control, or a combination of scraper and roller pressure adhesive control.

8. The continuous plant lamella fiber reinforced waterborne resin prepreg prepared by the preparation method of any one of claims 1 to 7.

9. The application of the continuous plant lamella fiber reinforced waterborne resin prepreg according to claim 8 in the preparation of laminated composite materials.

10. The application according to claim 9, characterized in that: The finished laminated composite material is made by laying multiple layers of prepreg at a preset angle, then hot-pressing and fully curing it.

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