High performance fiber reinforced and novel structural thermoplastic honeycomb composite panel

Abstract

The application relates to a high-performance fiber-reinforced and novel-structure thermoplastic honeycomb composite plate and belongs to the technical field of high polymer composite materials. The composite plate comprises a synergistically modified thermoplastic resin, reinforcing fibers, 2,6-dihydroxy triptycene, deionized water, an antioxidant, a lubricant, a flame retardant and a nucleating agent; wherein the synergistically modified thermoplastic resin is prepared by synergistically modifying polypropylene, glycidyl methacrylate, maleic anhydride, 2-methyl imidazole and sulfosalicylic acid through an epoxy ring-opening grafting reaction and ionic bonding. By constructing an ionic crosslinking network structure and introducing a rigid organic small molecule, the effective restriction of molecular chain movement is realized, and the interface bonding performance between the reinforcing fibers and the matrix is enhanced, so that the mechanical properties, heat resistance and creep resistance of the composite plate are significantly improved. The preparation method is simple, is suitable for industrial production and has a good application prospect.

Description

Technical Field

[0001] This invention belongs to the field of polymer composite materials technology, specifically relating to a high-performance fiber-reinforced thermoplastic honeycomb composite panel with a novel structure. Background Technology

[0002] Thermoplastic honeycomb composite panels are a type of lightweight, high-strength material made by using thermoplastic resin as the matrix and reinforcing fibers as the skeleton, constructing a honeycomb core structure through extrusion, molding, or hot pressing, and then bonding it with a panel. Due to its advantages such as low density, high specific strength, high molding efficiency, and recyclability, this type of material has been widely used in rail transit interiors, lightweight automotive structural components, building partition panels, and aerospace sandwich structures. Among these, general-purpose thermoplastic resins, such as polypropylene, are widely used as the matrix for honeycomb composite panels due to their low cost and good processing performance.

[0003] However, existing technologies still have significant shortcomings: First, thermoplastic resins such as polypropylene are non-polar materials with weak intermolecular forces. Under high temperature or long-term load conditions, molecular chain slippage and orientation relaxation can easily occur, leading to collapse or creep deformation of the honeycomb structure during compression or bending, making it difficult to meet the requirements of high-strength structural applications. Second, glass fiber or carbon fiber surfaces are mostly polar structures, while the polypropylene matrix has low polarity. The interfacial compatibility between the two is poor, and the interfacial adhesion is insufficient. Under impact loads or fatigue cycles, interfacial delamination can easily occur, leading to a decline in mechanical properties. Third, existing modification methods mostly use inorganic fillers or single grafting modification. Although these methods improve material properties to some extent, they lack multi-scale and multi-mechanism synergistic regulation, making it difficult to simultaneously improve the strength, toughness, and heat resistance of the material.

[0004] Furthermore, traditional honeycomb composite panels lack functional components capable of constructing stable network structures at the molecular scale, leading to insufficient structural stability during thermal processing and service, especially under high temperature or complex stress environments, where rapid performance degradation is likely to occur. Therefore, developing a synergistic modification method that can introduce multiple interacting structures into thermoplastic resins through chemical reactions, construct stable molecular networks, and strengthen the fiber / matrix interface, thereby significantly improving the overall performance of thermoplastic honeycomb composite panels, has significant research significance and application value. Summary of the Invention

[0005] To overcome the problems of insufficient molecular chain stability of thermoplastic resins, poor interfacial bonding between reinforcing fibers and the matrix, and easy creep deformation of honeycomb structures in the aforementioned background technologies, the present invention aims to provide a high-performance fiber-reinforced thermoplastic honeycomb composite panel with a novel structure. This invention uses a synergistically modified thermoplastic resin as the matrix. An ionic crosslinking network structure is constructed by introducing glycidyl methacrylate, maleic anhydride, 2-methylimidazole, and sulfosalicylic acid into polypropylene. Simultaneously, it combines reinforcing fibers composed of glass and carbon fibers, 2,6-dihydroxytriptene, an antioxidant composed of antioxidant 1010 and antioxidant 168, a lubricant composed of stearic acid and polyethylene wax, a flame retardant composed of ammonium polyphosphate and pentaerythritol, and a nucleating agent composed of talc and sorbitol nucleating agents, forming a multi-component synergistic thermoplastic honeycomb composite material system. By constructing an ionic crosslinking network and synergistically enhancing interfacial bonding, this invention significantly improves the mechanical properties, heat resistance, and structural stability of the composite panel.

[0006] The objective of this invention can be achieved through the following technical solutions: A high-performance fiber-reinforced and novel structural thermoplastic honeycomb composite panel, the composite panel comprising the following raw materials in parts by weight: 80-120 parts of synergistically modified thermoplastic resin, 20-80 parts of reinforcing fiber, 1-8 parts of 2,6-dihydroxytriptene, 10-50 parts of deionized water, 1-5 parts of antioxidant, 1-5 parts of lubricant, 2-15 parts of flame retardant, and 0.5-5 parts of nucleating agent; wherein the synergistically modified thermoplastic resin is a modified resin with an ionic cross-linked network structure formed by synergistic modification of polypropylene with glycidyl methacrylate, maleic anhydride, 2-methylimidazole, and sulfosalicylic acid through epoxy ring-opening grafting reaction and ionic association.

[0007] Optionally, the synergistically modified thermoplastic resin comprises the following raw materials in parts by weight: 80-120 parts polypropylene, 5-20 parts glycidyl methacrylate, 2-10 parts maleic anhydride, 0.5-5 parts 2-methylimidazole, and 1-8 parts sulfosalicylic acid.

[0008] Optionally, the method for preparing the synergistically modified thermoplastic resin includes the following steps: (1) Polypropylene, glycidyl methacrylate and maleic anhydride are mixed to obtain grafted modified polypropylene; (2) 2-methylimidazole was added to the grafted modified polypropylene to react and obtain epoxy ring-opening modified polypropylene. (3) Sulfosalicylic acid was added to epoxy ring-opening modified polypropylene to react and obtain synergistic modified thermoplastic resin.

[0009] Optionally, the reaction conditions in step (1) are: under nitrogen protection, the reaction is carried out at a temperature of 170–190°C and a speed of 100–300 rpm for 30–60 min.

[0010] Optionally, the reaction conditions for step (2) are to react at a temperature of 180–200 °C for 20–50 min.

[0011] Optionally, the reaction conditions for step (3) are to react at a temperature of 160–180 °C for 30–60 min.

[0012] Optionally, the reinforcing fiber is a mixture of glass fiber and carbon fiber in a mass ratio of 1:1 to 3:1; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 to 2:1; the lubricant is a mixture of stearic acid and polyethylene wax in a mass ratio of 1:1 to 3:1; the flame retardant is a mixture of ammonium polyphosphate and pentaerythritol in a mass ratio of 2:1 to 4:1; and the nucleating agent is a mixture of talc and sorbitol-based nucleating agents in a mass ratio of 1:1 to 3:1.

[0013] Optionally, a method for preparing a high-performance fiber-reinforced and novel structural thermoplastic honeycomb composite panel includes the following steps: S1, the reinforcing fiber is mixed with deionized water and pretreated, followed by drying, to obtain pretreated reinforcing fiber; S2, the synergistically modified thermoplastic resin, 2,6-dihydroxytriptene, antioxidant, lubricant, flame retardant and nucleating agent are mixed and melt-blended to obtain a composite melt material; S3, the composite molten material is combined with the pretreated reinforcing fiber obtained in step S1 to form a honeycomb structure and then hot-pressed to obtain a thermoplastic honeycomb composite board.

[0014] Optionally, the reaction conditions for step S1 are: treatment at 40–60°C for 20–60 min, followed by drying at 60–100°C for 30–120 min.

[0015] Optionally, the reaction conditions for step S2 are melt blending at a temperature of 180–240°C for 20–60 min and a rotation speed of 100–300 rpm; the reaction conditions for step S3 are extrusion molding to construct a honeycomb structure at a temperature of 180–220°C and hot pressing to set at a temperature of 200–260°C for 10–40 min.

[0016] The beneficial effects of this invention are: This invention introduces glycidyl methacrylate and maleic anhydride into polypropylene to form a grafted structure, and achieves an epoxy ring-opening reaction under the action of 2-methylimidazole. Simultaneously, sulfosalicylic acid is used to construct an ion-associative crosslinking network, thereby forming a stable ion-crosslinked structure at the molecular scale. This significantly inhibits molecular chain slip and improves the material's heat resistance and creep resistance. Furthermore, the polar groups introduced by grafting effectively enhance the interfacial compatibility between polypropylene and glass and carbon fibers, strengthening the interfacial bonding strength and thus improving the interlaminar shear strength and impact resistance of the composite board. Further, the rigid polycyclic structure of 2,6-dihydroxytriptene can spatially confine polymer segments, improving the system's structural rigidity and dimensional stability. In addition, the flame-retardant system formed by ammonium polyphosphate and pentaerythritol promotes char formation when the material is heated, significantly improving the material's flame-retardant properties. Through the synergistic effect of multiple mechanisms, the resulting thermoplastic honeycomb composite board exhibits simultaneous improvements in strength, toughness, heat resistance, and structural stability, demonstrating excellent comprehensive performance. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a comparison of the infrared spectra of polypropylene and synergistically modified thermoplastic resin. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments. However, the present invention is not limited to the following embodiments. Equivalent adjustments made without departing from the spirit and essence of the present invention should also be considered to fall within the protection scope of the present invention.

[0020] Example 1: The purpose of this example is to verify the basic properties of the material under low component content and mild reaction conditions.

[0021] S1. 80 parts of polypropylene, 5 parts of glycidyl methacrylate, and 2 parts of maleic anhydride were mixed and reacted at 170°C and 100 rpm for 30 min under nitrogen protection to obtain grafted modified polypropylene; then 0.5 parts of 2-methylimidazole were added and reacted at 180°C for 20 min to obtain epoxy ring-opening modified polypropylene; then 1 part of sulfosalicylic acid was added and reacted at 160°C for 30 min to obtain synergistically modified thermoplastic resin. S2, 80 parts of the synergistic modified thermoplastic resin obtained in step S1, 1 part of 2,6-dihydroxytriptene, 1 part of antioxidant, 1 part of lubricant, 2 parts of flame retardant and 0.5 parts of nucleating agent are melt-blended at 100 rpm for 20 min at 180℃ to obtain composite melt material; S3, glass fiber and carbon fiber are mixed at a mass ratio of 1:1 to obtain 20 parts of reinforcing fiber, which are then treated with 10 parts of deionized water at 40°C for 20 min and dried at 60°C for 30 min to obtain pretreated reinforcing fiber; the pretreated reinforcing fiber is then compounded with the composite melt material obtained in step S2 and extruded to form a honeycomb structure at 180°C, and then hot-pressed at 200°C for 10 min to obtain a thermoplastic honeycomb composite board.

[0022] Example 2: The purpose of this example is to obtain a thermoplastic honeycomb composite panel with optimal overall performance.

[0023] S1. 100 parts of polypropylene, 12 parts of glycidyl methacrylate, and 6 parts of maleic anhydride were mixed and reacted at 180°C and 200 rpm for 45 min under nitrogen protection to obtain grafted modified polypropylene; then 2 parts of 2-methylimidazole were added and reacted at 190°C for 35 min to obtain epoxy ring-opening modified polypropylene; then 4 parts of sulfosalicylic acid were added and reacted at 170°C for 45 min to obtain synergistically modified thermoplastic resin. Figure 1 Medium-modified unmodified polypropylene has a thickness of 2950–2840 cm⁻¹ -1 Distinct stretching vibration peaks of -CH3 and -CH2 appear at 1455 cm⁻¹. -1 and 1375 cm -1 The presence of a characteristic bending vibration peak at 1720 cm⁻¹ indicates that it has a typical nonpolar hydrocarbon structure; after modification, the peak appears at 1720 cm⁻¹. -1 The presence of a distinct C=O absorption peak at 1100 cm⁻¹ indicates successful grafting of glycidyl methacrylate and maleic anhydride; -1 The characteristic peak of S=O appears nearby, and at 3200–3600 cm⁻¹ -1 The presence of a broad -OH absorption peak within the range indicates that sulfosalicylic acid participates in the reaction and forms hydrogen bonds or ion-associated structures; approximately 910 cm⁻¹ -1 The significant weakening of the characteristic peaks of epoxy indicates that the epoxy groups have undergone a ring-opening reaction; overall, this shows that a synergistic modified structure has been successfully constructed. S2, 100 parts of the synergistic modified thermoplastic resin obtained in step S1, 4 parts of 2,6-dihydroxytriptene, 3 parts of antioxidant, 3 parts of lubricant, 8 parts of flame retardant and 2 parts of nucleating agent are melt-blended at 210°C and 200 rpm for 40 min to obtain a composite melt material. S3, glass fiber and carbon fiber are mixed at a mass ratio of 2:1 to obtain 50 parts of reinforcing fiber, which are then treated with 30 parts of deionized water at 50°C for 40 min and dried at 80°C for 60 min to obtain pretreated reinforcing fiber; the pretreated reinforcing fiber is then compounded with the composite melt material obtained in step S2 and extruded to form a honeycomb structure at 200°C, and then hot-pressed at 230°C for 25 min to obtain a thermoplastic honeycomb composite board.

[0024] Example 3: The purpose of this example is to verify the ultimate performance of the material under conditions of high component content and enhanced reaction.

[0025] S1. 120 parts of polypropylene, 20 parts of glycidyl methacrylate, and 10 parts of maleic anhydride were mixed and reacted under nitrogen protection at 190°C and 300 rpm for 60 min to obtain grafted modified polypropylene; then 5 parts of 2-methylimidazole were added and reacted at 200°C for 50 min to obtain epoxy ring-opening modified polypropylene; then 8 parts of sulfosalicylic acid were added and reacted at 180°C for 60 min to obtain synergistically modified thermoplastic resin. S2, 120 parts of the synergistic modified thermoplastic resin, 8 parts of 2,6-dihydroxytriptene, 5 parts of antioxidant, 5 parts of lubricant, 15 parts of flame retardant and 5 parts of nucleating agent obtained in step S1 are melt-blended at 240°C and 300 rpm for 60 min to obtain a composite melt material. S3, glass fiber and carbon fiber are mixed at a mass ratio of 3:1 to obtain 80 parts of reinforcing fiber, which are then treated with 50 parts of deionized water at 60°C for 60 min and dried at 100°C for 120 min to obtain pretreated reinforcing fiber; the pretreated reinforcing fiber is then compounded with the composite melt material obtained in step S2 and extruded to form a honeycomb structure at 220°C, and then hot-pressed at 260°C for 40 min to obtain a thermoplastic honeycomb composite board.

[0026] Comparative Example 1: The purpose of this comparative example is to verify the effect of using only graft modification without forming an ionic cross-linked structure on the material properties.

[0027] S1, 100 parts of polypropylene, 12 parts of glycidyl methacrylate and 6 parts of maleic anhydride were mixed and reacted at 180℃ and 200 rpm for 45 min under nitrogen protection to obtain grafted modified polypropylene. S2, 100 parts of grafted modified polypropylene, 4 parts of 2,6-dihydroxytriptene, 3 parts of antioxidant, 3 parts of lubricant, 8 parts of flame retardant and 2 parts of nucleating agent obtained in step S1 are melt-blended at 210℃ and 200 rpm for 40 min to obtain composite melt material. S3, glass fiber and carbon fiber are mixed at a mass ratio of 2:1 to obtain 50 parts of reinforcing fiber, which are then treated with 30 parts of deionized water at 50°C for 40 min and dried at 80°C for 60 min to obtain pretreated reinforcing fiber; the pretreated reinforcing fiber is then compounded with the composite melt material obtained in step S2 and extruded to form a honeycomb structure at 200°C, and then hot-pressed at 230°C for 25 min to obtain a thermoplastic honeycomb composite board.

[0028] Comparative Example 2: The purpose of this comparative example is to verify the effect of only performing epoxy ring-opening modification without introducing ion-associated structures on the material properties.

[0029] S1, 100 parts of polypropylene, 12 parts of glycidyl methacrylate and 6 parts of maleic anhydride were mixed and reacted at 180℃ and 200 rpm for 45 min under nitrogen protection to obtain grafted modified polypropylene; then 2 parts of 2-methylimidazole were added and reacted at 190℃ for 35 min to obtain epoxy ring-opening modified polypropylene. S2, 100 parts of epoxy ring-opening modified polypropylene, 4 parts of 2,6-dihydroxytriptene, 3 parts of antioxidant, 3 parts of lubricant, 8 parts of flame retardant and 2 parts of nucleating agent obtained in step S1 are melt-blended at 210℃ and 200 rpm for 40 min to obtain composite melt material. S3, glass fiber and carbon fiber are mixed at a mass ratio of 2:1 to obtain 50 parts of reinforcing fiber, which are then treated with 30 parts of deionized water at 50°C for 40 min and dried at 80°C for 60 min to obtain pretreated reinforcing fiber; the pretreated reinforcing fiber is then compounded with the composite melt material obtained in step S2 and extruded to form a honeycomb structure at 200°C, and then hot-pressed at 230°C for 25 min to obtain a thermoplastic honeycomb composite board.

[0030] Comparative Example 3: The purpose of this comparative example is to verify the effect of not adding 2,6-dihydroxytriptene on the material properties.

[0031] S1. 100 parts of polypropylene, 12 parts of glycidyl methacrylate, and 6 parts of maleic anhydride were mixed and reacted at 180°C and 200 rpm for 45 min under nitrogen protection to obtain grafted modified polypropylene; then 2 parts of 2-methylimidazole were added and reacted at 190°C for 35 min to obtain epoxy ring-opening modified polypropylene; then 4 parts of sulfosalicylic acid were added and reacted at 170°C for 45 min to obtain synergistically modified thermoplastic resin. S2, 100 parts of the synergistic modified thermoplastic resin, 3 parts of antioxidant, 3 parts of lubricant, 8 parts of flame retardant and 2 parts of nucleating agent obtained in step S1 are melt-blended at 210°C and 200 rpm for 40 min to obtain a composite melt material. S3, glass fiber and carbon fiber are mixed at a mass ratio of 2:1 to obtain 50 parts of reinforcing fiber, which are then treated with 30 parts of deionized water at 50°C for 40 min and dried at 80°C for 60 min to obtain pretreated reinforcing fiber; the pretreated reinforcing fiber is then compounded with the composite melt material obtained in step S2 and extruded to form a honeycomb structure at 200°C, and then hot-pressed at 230°C for 25 min to obtain a thermoplastic honeycomb composite board.

[0032] Performance testing: 1. Interlaminar shear strength test The thermoplastic honeycomb composite panels prepared in the examples and comparative examples were cut into specimens with a length of 80 mm, a width of 10 mm, and a thickness of 5 mm. The interlaminar shear strength was tested using a universal testing machine. The specimens were placed in a short beam shear fixture and loaded at a loading rate of 1 mm / min at 23°C until interlaminar failure occurred. The maximum load was recorded and the interlaminar shear strength was calculated according to the formula to evaluate the interfacial bonding ability between the reinforcing fibers and the synergistically modified thermoplastic resin.

[0033] 2. Impact strength test The composite plates obtained in the examples and comparative examples were processed into standard notched specimens with a length of 80 mm, a width of 10 mm, and a thickness of 4 mm. The notch depth was 2 mm. The specimens were tested using a cantilever beam impact testing machine at 23°C. The impact energy absorbed when the specimen fractured was recorded, and the impact strength was calculated to characterize the material's resistance to damage and toughness under instantaneous impact load.

[0034] 3. Heat distortion temperature test The composite plates prepared in the examples and comparative examples were processed into samples with a length of 120 mm, a width of 10 mm, and a thickness of 4 mm. The samples were tested in a heat distortion temperature tester under a load of 0.45 MPa and a heating rate of 2 °C / min. The temperature at which a deformation of 0.34 mm occurs in the middle of the sample is the heat distortion temperature, which is used to evaluate the dimensional stability and heat resistance of the material under thermal conditions.

[0035] 4. Creep performance test The composite plates obtained in the examples and comparative examples were processed into specimens with a length of 100 mm, a width of 10 mm, and a thickness of 4 mm. A constant stress of 10 MPa was applied in a constant temperature environment of 50°C and the test was conducted continuously for 10 h. The deformation of the specimens over time was recorded, and creep curves were plotted. By comparing the creep rate and final deformation of different specimens, the structural stability and creep resistance of the material under long-term load were evaluated.

[0036] Table 1 Performance test results of composite panels

[0037] As shown in Table 1, the interlaminar shear strength, impact strength, and heat distortion temperature of Examples 1-3 were significantly higher than those of Comparative Examples 1-3, while the creep deformation variable was significantly reduced, indicating that the ion-crosslinked network structure constructed through synergistic modification can effectively improve the overall performance of the composite plate. Among them, Example 2 achieved the highest level in all performance indicators, demonstrating the best comprehensive performance.

[0038] Specifically, in terms of interlaminar shear strength, Example 2 reached 36.8 MPa, which is significantly higher than the 22.1 MPa of Comparative Example 1 and the approximately 25 MPa of Comparative Examples 2 and 3. This indicates that by grafting glycidyl methacrylate and maleic anhydride to introduce polar groups and combining them with sulfosalicylic acid to form an ion-associated structure, the interfacial bonding ability between the polypropylene matrix and glass fiber and carbon fiber can be significantly enhanced, thereby effectively improving the interlaminar shear resistance.

[0039] In terms of impact performance, the impact strength of Example 2 reached 58.7 kJ·m. -2 The results were significantly better than those of the other pairs, indicating that the ionic cross-linking network can effectively disperse stress and prevent crack propagation under impact load. At the same time, the rigid polycyclic structure of 2,6-dihydroxytriptene plays a spatial confinement role on the molecular chain, enabling the material to maintain high rigidity while also having good toughness.

[0040] In terms of thermal properties, the heat distortion temperature of Example 2 was 148°C, which was significantly higher than that of the comparative sample, indicating that the ionic cross-linking network has a significant restrictive effect on the movement of molecular chains and improves the structural stability of the material under high temperature conditions. At the same time, in the creep test, the deformation of Example 2 was only 1.12%, which was far lower than the level of more than 2% of the comparative sample, further proving that the synergistic modified structure can effectively inhibit the long-term slippage of molecular chains and improve the creep resistance of the material.

[0041] Comparative analysis shows that while grafting or epoxy ring-opening modification improves material properties to some extent, the lack of synergistic effect of ion-associated structures makes it difficult to form a stable network structure, thus limiting the overall performance improvement. However, without the addition of 2,6-dihydroxytriptene, the impact performance and thermal stability of the material decrease, indicating that this small organic molecule plays an important role in enhancing rigidity and restricting chain segment movement.

[0042] In summary, the synergistic modified thermoplastic resin system constructed through grafting reaction, epoxy ring-opening reaction and ion association, combined with the synergistic effect of reinforcing fibers and functional organic small molecules, can significantly improve the mechanical properties, heat resistance and long-term stability of thermoplastic honeycomb composite panels, making Example 2 exhibit the best overall performance.

Claims

1. A high-performance fiber-reinforced and novel structural thermoplastic honeycomb composite panel, characterized in that, The composite board comprises the following raw materials in parts by weight: 80-120 parts of synergistically modified thermoplastic resin, 20-80 parts of reinforcing fiber, 1-8 parts of 2,6-dihydroxytriptene, 10-50 parts of deionized water, 1-5 parts of antioxidant, 1-5 parts of lubricant, 2-15 parts of flame retardant, and 0.5-5 parts of nucleating agent; the synergistically modified thermoplastic resin is a modified resin with an ionic cross-linked network structure formed by synergistic modification of polypropylene with glycidyl methacrylate, maleic anhydride, 2-methylimidazole, and sulfosalicylic acid through epoxy ring-opening grafting reaction and ionic association.

2. The high-performance fiber-reinforced and novel thermoplastic honeycomb composite panel according to claim 1, characterized in that, The synergistically modified thermoplastic resin comprises the following raw materials in parts by weight: 80-120 parts polypropylene, 5-20 parts glycidyl methacrylate, 2-10 parts maleic anhydride, 0.5-5 parts 2-methylimidazole, and 1-8 parts sulfosalicylic acid.

3. A high-performance fiber-reinforced and novel thermoplastic honeycomb composite panel according to claim 1 or 2, characterized in that, The preparation method of the synergistically modified thermoplastic resin includes the following steps: (1) Polypropylene, glycidyl methacrylate and maleic anhydride are mixed to obtain grafted modified polypropylene; (2) 2-methylimidazole was added to the grafted modified polypropylene to react and obtain epoxy ring-opening modified polypropylene. (3) Sulfosalicylic acid was added to epoxy ring-opening modified polypropylene to react and obtain synergistic modified thermoplastic resin.

4. The high-performance fiber-reinforced and novel thermoplastic honeycomb composite panel according to claim 3, characterized in that, The reaction conditions for step (1) are: under nitrogen protection, at a temperature of 170–190°C and a rotation speed of 100–300 rpm for 30–60 min.

5. The high-performance fiber-reinforced and novel thermoplastic honeycomb composite panel according to claim 3, characterized in that, The reaction conditions for step (2) are to react at a temperature of 180-200℃ for 20-50 min.

6. The high-performance fiber-reinforced and novel thermoplastic honeycomb composite panel according to claim 3, characterized in that, The reaction conditions for step (3) are to react at a temperature of 160-180°C for 30-60 minutes.

7. The high-performance fiber-reinforced and novel thermoplastic honeycomb composite panel according to claim 1, characterized in that, The reinforcing fiber is a mixture of glass fiber and carbon fiber in a mass ratio of 1:1 to 3:1; the antioxidant is a mixture of antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1 to 2:1; the lubricant is a mixture of stearic acid and polyethylene wax in a mass ratio of 1:1 to 3:1; the flame retardant is a mixture of ammonium polyphosphate and pentaerythritol in a mass ratio of 2:1 to 4:1; and the nucleating agent is a mixture of talc and sorbitol-based nucleating agents in a mass ratio of 1:1 to 3:

1.

8. A method for preparing a high-performance fiber-reinforced and novel structural thermoplastic honeycomb composite panel, characterized in that, The preparation method includes the following steps: S1, the reinforcing fiber is mixed with deionized water and pretreated, followed by drying, to obtain pretreated reinforcing fiber; S2, the synergistically modified thermoplastic resin, 2,6-dihydroxytriptene, antioxidant, lubricant, flame retardant and nucleating agent are mixed and melt-blended to obtain a composite melt material; S3, the composite molten material is combined with the pretreated reinforcing fiber obtained in step S1 to form a honeycomb structure and then hot-pressed to obtain a thermoplastic honeycomb composite board.

9. The method for preparing a high-performance fiber-reinforced and novel thermoplastic honeycomb composite panel according to claim 8, characterized in that, The reaction conditions for step S1 are: treatment at 40–60°C for 20–60 min, followed by drying at 60–100°C for 30–120 min.

10. The method for preparing a high-performance fiber-reinforced and novel structural thermoplastic honeycomb composite panel according to claim 8, characterized in that, The reaction conditions for step S2 are melt blending at a temperature of 180–240°C for 20–60 min and a rotation speed of 100–300 rpm; the reaction conditions for step S3 are extrusion molding to construct a honeycomb structure at a temperature of 180–220°C and hot pressing to set at a temperature of 200–260°C for 10–40 min.

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