High-temperature-resistant bio-based composite material with core-shell structure and preparation method thereof
By constructing a nano-alumina ceramic shell on the surface of plant fibers, the interfacial compatibility and thermal stability issues of polypropylene-plant fiber composites were resolved, thereby improving the mechanical properties and thermal stability of the composites.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-04-03
AI Technical Summary
Traditional polypropylene-plant fiber composites suffer from poor interfacial compatibility and low thermal stability of plant fibers, resulting in insufficient mechanical properties and easy decomposition and discoloration under high-temperature processing.
A nanoscale alumina ceramic shell was constructed on the surface of plant fibers using the sol-gel method to modify the plant fibers, thereby improving their bonding with the polymer matrix and enhancing the interface through the core-shell structure.
It significantly improves the tensile strength and thermal stability of composite materials, avoids thermal decomposition and discoloration, and realizes high-performance bio-based composite materials.
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Figure CN121779829A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of polymer technology, specifically to a core-shell structured high-temperature resistant bio-based composite material and its preparation method. Background Technology
[0002] Traditionally, agricultural byproducts such as straw and bran, considered a burden, not only pollute the environment when burned in the open or dumped indiscriminately, but also directly emit greenhouse gases. They are now being redefined as valuable biomass resources. Through energy conversion, fertilizer production, and even materials utilization, direct emissions can be eliminated at the source, and a closed-loop circular economy chain can be built by replacing fossil fuels and energy-intensive materials. The composite granulation technology of polypropylene and plant fibers is a vivid micro-level application of this macro-strategy in the materials field.
[0003] However, the industrialization of this system faces two major technological bottlenecks: First, the interfacial compatibility between polar plant fibers and non-polar polypropylene matrix is poor, resulting in insufficient mechanical properties of the composite material; second, the plant fibers themselves have low thermal stability and are prone to thermal decomposition, discoloration and odor at polyolefin processing temperatures, which seriously restricts their application in high-quality products. Summary of the Invention
[0004] The purpose of this invention is to provide a core-shell structured high-temperature resistant bio-based composite material and its preparation method, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] A core-shell structured high-temperature resistant bio-based composite material, comprising the following components by weight: 50-60 parts polypropylene, 30-40 parts modified plant fiber, 10-20 parts inorganic filler, 0.1-0.3 parts silane coupling agent, 0.2-0.5 parts antioxidant, and 0.1-0.5 parts lubricant;
[0007] The method for preparing the modified plant fiber includes:
[0008] S1. Crush the dried plant fiber, stir it thoroughly in water for 1-2 hours, filter to obtain precipitate, then wash it with deionized water using ultrasound, filter to obtain precipitate and then dry it.
[0009] S2, add the dried plant fiber from S1 to a sodium hydroxide solution with a mass fraction of 4-5%, soak at 40-50℃ for 2-3 hours, then filter and dry;
[0010] S3 involves dissolving an aluminum source in water at 80-100℃, adding hydrochloric acid as a catalyst, and continuously stirring to hydrolyze and form a sol.
[0011] S4. The dried plant fibers from S2 are completely immersed in the sol prepared in S3. The mixture is stirred for 1-2 hours to allow the sol to penetrate into the micropores of the plant fibers, thus obtaining a mixed solution.
[0012] S5 adjusts the pH of the mixture in S4 to promote gelation of the surface and interior of the sol-gel plant fiber, forming a nano-three-dimensional structure. After drying, the modified plant fiber powder is obtained.
[0013] Preferably, the polypropylene is at least one of syndiotactic polypropylene and atactic polypropylene.
[0014] Preferably, in S1, the plant fiber includes one or a mixture of several of the following: straw, wheat bran, rice husk, wood flour, and bamboo flour.
[0015] Preferably, in step S1, the mesh size of the pulverized plant fiber is 50-400 mesh.
[0016] Preferably, in S3, the aluminum source is at least one of aluminum isopropoxide, aluminum chloride, and aluminum nitrate.
[0017] Preferably, in step S3, the concentration of added hydrochloric acid is 0.05-0.15 mol / L, and the amount of added hydrochloric acid is used to adjust the pH of the sol to 2-3.
[0018] Preferably, the mass ratio of aluminum source, water in S3 and plant fiber added in S4 is plant fiber: aluminum source (as a compound): water = 1:1:0.5.
[0019] Preferably, in step S5, the pH of the mixture is adjusted to 3-5 using a 0.15-0.25 mol / L sodium hydroxide solution.
[0020] Preferably, in step S5, after adjusting the pH of the mixture, the mixture begins to gel. After gelation, it is aged with anhydrous ethanol for 6-12 hours, then hydrophobically treated with a silane coupling agent (preferably the raw material in this scheme, 100-120 g / L, with ethanol as the solvent) for 6-12 hours, followed by supercritical carbon dioxide drying or atmospheric pressure drying. The ethanol aging and silane coupling agent hydrophobic treatment are standard procedures in the "sol-gel method" and are performed according to standard laboratory protocols.
[0021] Preferably, the inorganic filler includes at least one of magnesium oxide, talc, and mica; the silane coupling agent is at least one of butadienetriethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane; the antioxidant is at least one of hindered phenols, thioesters, and phosphites; and the lubricant is at least one of polyethylene wax, stearate, and ethylene bis-stearamide.
[0022] This invention also provides a method for preparing a core-shell structured high-temperature resistant bio-based composite material, specifically including the following steps:
[0023] Step 1: Add polypropylene, modified plant fiber, inorganic filler, silane coupling agent, antioxidant and lubricant together to a mixer under nitrogen protection and mix at high speed to obtain a mixture.
[0024] Step 2: Before pelletizing, ensure that the screw and barrel of the extruder meet the Class A cleaning requirements. Then, under nitrogen protection, feed the mixture into a parallel twin-screw extruder for melting. After extrusion and granulation, a core-shell structure high-temperature resistant bio-based composite material is obtained.
[0025] Preferably, in step one, the high-speed mixing time is 5-15 minutes.
[0026] Preferably, in step two, the barrel temperature of the parallel twin-screw extruder is 170-190℃, the screw speed is 200-500 r / min, and the vacuum degree is -0.07~0.08MPa.
[0027] The beneficial effects of the above-described technical solution of the present invention are as follows:
[0028] (1) This invention modifies the surface of plant fibers using a sol-gel method, and constructs a nano-scale alumina ceramic shell on the surface of the plant fibers in situ, transforming them from a hydrophilic biomass filler that is easily decomposed by heat into a high-performance composite filler that can be well combined with the polymer matrix. The decomposition temperature of the modified plant fibers is increased by 30-50℃, effectively isolating the direct effect of heat and oxygen on heat-sensitive components such as cellulose and hemicellulose during high-temperature processing, significantly delaying their thermal decomposition initiation temperature, so that the modified plant fibers can maintain structural integrity at the conventional processing temperature of polypropylene, avoiding discoloration, charring and odor.
[0029] (2) The core-shell structure constructed in this invention endows the fiber with hydrophobicity, reduces the interfacial tension between it and the non-polar polypropylene matrix, and further bridges the polypropylene molecular chain, realizing the interfacial reinforcement from "physical mixing" to "chemical anchoring". This synergistic effect significantly improves the tensile strength and flexural modulus of the composite material, overcoming the problem of mechanical property deterioration caused by interfacial debonding in traditional plant fiber / polypropylene composite materials.
[0030] (3) The core-shell structure high temperature resistant bio-based composite material prepared by the present invention is made of general polypropylene substrate, plant fiber, inorganic filler, silane coupling agent, lubricant and antioxidant. Its raw materials are widely available and can be directly used in industrial production. It does not contain halogen flame retardants or toxic additives. The composite material prepared has the characteristics of low cost, high temperature resistance and meeting food contact requirements. Attached Figure Description
[0031] The above and other objects, features, and advantages of exemplary embodiments of the present invention will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of the invention are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:
[0032] Figure 1 This is a comparison diagram of the composite materials prepared in Example 2 and Comparative Example 1 of the present invention. Detailed Implementation
[0033] The following embodiments are provided to better understand the present invention and are not limited to the preferred embodiments described. They do not constitute a limitation on the content and scope of protection of the present invention. Any product that is the same as or similar to the present invention, derived by any person under the guidance of the present invention or by combining the features of the present invention with other prior art, falls within the protection scope of the present invention.
[0034] In the existing technology, the composite granulation of polypropylene and plant fiber is a way to realize the resource utilization of agricultural waste gas. However, the industrialization of this system faces two problems. First, the interfacial compatibility between polar plant fiber and non-polar polypropylene matrix is poor, resulting in insufficient mechanical properties of composite materials. Second, plant fiber itself has low thermal stability and is prone to thermal decomposition, discoloration and odor at polyolefin processing temperature.
[0035] Aerogels are nanoscale porous solid materials formed by replacing the liquid phase in a gel with gas through a sol-gel method and a specific drying process. These products exhibit low density and low thermal conductivity, effectively suppressing heat conduction. Their average pore size is approximately 50 nm, lower than the mean free path of air molecules, effectively inhibiting heat transfer via air convection. Furthermore, the virtually infinite number of pore walls in aerogels act as reflective and refractive surfaces for radiation; combined with special reflective materials, this minimizes thermal radiation. In summary, aerogel materials effectively suppress the combined effects of heat conduction, convection, and radiation, virtually blocking all pathways of heat transfer.
[0036] To address the aforementioned issues, this invention involves surface gelation treatment of plant fibers, coating their surface with a continuous, dense, or porous inorganic alumina ceramic film. This transforms the plant fibers from a thermally decomposable hydrophilic biomass filler into a high-performance composite filler that can effectively bond with the polymer matrix. This significantly improves the heat resistance of wheat bran and allows for full bonding between polypropylene resin and plant fibers, resulting in a product that is low-cost, high-performance, and environmentally friendly.
[0037] The reagents used in this embodiment and their suppliers are as follows: polypropylene is random copolymer polypropylene (Zhenhai Refining & Chemical PP T30S), talc powder (Liaoning Xinda SDP-8072), plant fiber mesh size is 200 mesh, and the water used is deionized water. The above reagents are only used to illustrate the source and composition of the reagents used in the experiments of this invention, for the purpose of full disclosure, and do not imply that the invention cannot be achieved by using other similar reagents or reagents provided by other suppliers. For experimental steps or conditions not specified in the embodiments (such as ethanol aging and hydrophobic silane coupling agents), the conventional experimental steps or conditions described in the literature in this field can be followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional reagent products.
[0038] Example 1
[0039] A core-shell structured high-temperature resistant bio-based composite material comprises, by weight, the following components: 60 parts random copolymer polypropylene, 30 parts modified wheat bran, 10 parts talc, 0.15 parts vinyltrimethoxysilane, 0.2 parts hindered phenolic antioxidant, and 0.2 parts ethylene bis-stearamide.
[0040] The specific preparation method includes the following steps:
[0041] S1. Weigh the required amount of dry wheat bran according to the proportion, crush the wheat bran, stir it thoroughly in water for 1 hour, filter to obtain precipitate, then wash it with deionized water using ultrasound, and take the washed precipitate for drying.
[0042] S2, add the dried wheat bran from S1 to a 4% sodium hydroxide solution, soak at 40°C for 3 hours, filter, and then dry the filtrate;
[0043] S3, aluminum isopropoxide is dissolved in water at 80℃, 0.1mol / L hydrochloric acid is added (to adjust the pH of the solution to 2) as a catalyst, and the mixture is continuously stirred to hydrolyze it into a sol;
[0044] S4. The wheat bran treated in S2 is completely immersed in the sol prepared in S3. By stirring for 1.5 hours, the sol is allowed to penetrate into the micropores of the wheat bran to obtain a mixture.
[0045] The mass ratio of aluminum source and water added in S3 to plant fiber added in S4 is plant fiber: aluminum source: water = 1:1:0.5.
[0046] S5, add 0.15mol / L sodium hydroxide solution to adjust the pH of the mixture in S4 to 3, promote the gelation of the sol on the surface and inside of the wheat bran to form a nano three-dimensional structure. After gelation, age with anhydrous ethanol for 6h, then hydrophobically treat with 100g / L silane coupling agent for 12h, and then supercritically dry with carbon dioxide to obtain modified wheat bran powder.
[0047] S6, take 60 parts of random copolymer polypropylene, 10 parts of talc, 0.2 parts of hindered phenolic antioxidant, 0.2 parts of ethylene bis-stearamide, 0.15 parts of vinyltrimethoxysilane and 30 parts of the modified wheat bran powder prepared in S5, add them together to a mixer under nitrogen protection and mix at high speed for 10 minutes to obtain a mixture.
[0048] Before granulation, ensure that the screw and barrel of the extruder meet the Class A cleaning requirements. Under nitrogen protection, the mixture prepared in S6 is fed into a parallel twin-screw extruder for melting, extrusion, and granulation. The barrel temperature of the extruder is 190℃, the screw speed is 400r / min, and the vacuum degree is -0.07MPa.
[0049] Example 2
[0050] A core-shell structured high-temperature resistant bio-based composite material comprises, by weight, the following components: 55 parts random copolymer polypropylene, 35 parts modified wheat bran, 10 parts talc, 0.15 parts vinyltrimethoxysilane, 0.2 parts hindered phenolic antioxidant, and 0.2 parts ethylene bis-stearamide.
[0051] The specific preparation method includes the following steps:
[0052] S1. Weigh the required amount of dry wheat bran according to the proportion, crush the wheat bran, stir it thoroughly in water for 2 hours, filter to obtain precipitate, then wash it with deionized water using ultrasound, and take the washed precipitate for drying.
[0053] S2, add the dried wheat bran from S1 to a 5% sodium hydroxide solution, soak at 50°C for 3 hours, filter, and then dry the filtrate;
[0054] S3, dissolve aluminum nitrate in water at 100℃, add 0.15mol / L hydrochloric acid (to adjust the pH of the solution to 2.5) as a catalyst, and stir continuously to hydrolyze it into a sol;
[0055] S4. The wheat bran treated in S2 is completely immersed in the sol prepared in S3. After stirring for 2 hours, the sol is allowed to penetrate into the micropores of the wheat bran to obtain a mixture.
[0056] The mass ratio of aluminum source and water added in S3 to plant fiber added in S4 is plant fiber: aluminum source: water = 1:1:0.5.
[0057] S5, add 0.2 mol / L sodium hydroxide solution to adjust the pH of the mixture in S4 to 4, promote the gelation of the sol on the surface and inside of the wheat bran to form a nano three-dimensional structure. After gelation, age with anhydrous ethanol for 8 hours, then hydrophobically treat with 100 g / L silane coupling agent for 10 hours, and then supercritically dry with carbon dioxide to obtain modified wheat bran powder.
[0058] S6, take 55 parts of random copolymer polypropylene, 10 parts of talc, 0.2 parts of hindered phenolic antioxidant, 0.2 parts of ethylene bis-stearamide, 0.15 parts of vinyltrimethoxysilane and 35 parts of the modified wheat bran powder prepared in S5, add them together to a mixer under nitrogen protection and mix at high speed for 10 minutes to obtain a mixture.
[0059] Before granulation, ensure that the screw and barrel of the extruder meet the Class A cleaning requirements. Under nitrogen protection, feed the mixture prepared in S6 into a parallel twin-screw extruder for melting, and then granulate it. The barrel temperature of the extruder is 180℃, the screw speed is 500r / min, and the vacuum degree is -0.02MPa.
[0060] Example 3
[0061] A core-shell structured high-temperature resistant bio-based composite material comprises, by weight, the following components: 50 parts random copolymer polypropylene, 40 parts modified straw, 10 parts talc, 0.15 parts vinyltrimethoxysilane, 0.2 parts hindered phenolic antioxidant, and 0.2 parts ethylene bis-stearamide.
[0062] The specific preparation method includes the following steps:
[0063] S1. Weigh the required amount of dry straw according to the proportion, crush the straw, stir it thoroughly in water for 2 hours, filter to obtain precipitate, then wash it with deionized water using ultrasound, and take the washed precipitate for drying.
[0064] S2, add the dried straw from S1 to a 4% sodium hydroxide solution, soak at 50°C for 2 hours, filter, and then dry the filtrate;
[0065] S3, dissolve aluminum chloride in water at 90℃, add 0.05mol / L hydrochloric acid (to adjust the pH of the solution to 3) as a catalyst, and stir continuously to hydrolyze it into a sol;
[0066] S4. The straw treated in S2 is completely immersed in the sol prepared in S3. After stirring for 2 hours, the sol is allowed to penetrate into the micropores of the straw to obtain a mixed solution.
[0067] The mass ratio of aluminum source and water added in S3 to plant fiber added in S4 is plant fiber: aluminum source: water = 1:1:0.5.
[0068] S5, add 0.25mol / L sodium hydroxide solution to adjust the pH of the mixture in S4 to 5, promote the gelation of the sol on the surface and inside of the straw to form a nano three-dimensional structure. After gelation, age with anhydrous ethanol for 12h, then hydrophobically treat with 100g / L silane coupling agent for 8h, and then supercritical carbon dioxide drying to obtain modified straw powder.
[0069] S6, take 50 parts of random copolymer polypropylene, 10 parts of talc, 0.2 parts of hindered phenolic antioxidant, 0.2 parts of ethylene bis-stearamide, 0.15 parts of vinyltrimethoxysilane and 40 parts of the modified straw powder prepared in S5, add them together to a mixer under nitrogen protection and mix at high speed for 10 minutes to obtain a mixture.
[0070] Before granulation, ensure that the screw and barrel of the extruder meet the Class A cleaning requirements. Under nitrogen protection, the mixture prepared in S6 is fed into a parallel twin-screw extruder for melting, extrusion, and granulation. The barrel temperature of the extruder is 170℃, the screw speed is 600r / min, and the vacuum degree is 0.08MPa.
[0071] Comparative Example 1
[0072] A core-shell structured high-temperature resistant bio-based composite material, which differs from Example 2 in that it uses unmodified plant fibers, and the specific preparation method includes the following steps:
[0073] S1. Weigh the required amount of dry wheat bran according to the proportion, crush the wheat bran, stir it thoroughly in water for 2 hours, filter to obtain precipitate, then wash it with deionized water using ultrasound, and take the washed precipitate for drying.
[0074] S2, add the dried wheat bran from S1 to a 5% sodium hydroxide solution, soak at 50°C for 3 hours, filter, and then dry the filtrate;
[0075] S3: Take 55 parts of random copolymer polypropylene, 10 parts of talc, 0.2 parts of hindered phenolic antioxidant, 0.2 parts of ethylene bis-stearamide, 0.15 parts of vinyltrimethoxysilane and 35 parts of dried wheat bran powder from S2, and mix them together in a mixer under nitrogen protection at high speed for 10 minutes to obtain a mixture.
[0076] S4. Before pelletizing, ensure that the screw and barrel of the extruder meet the A-level cleaning requirements. Under nitrogen protection, feed the mixture prepared in S3 into a parallel twin-screw extruder for melting, and then extrude and granulate it. The barrel temperature of the extruder is 180℃, the screw speed is 500r / min, and the vacuum degree is -0.02MPa.
[0077] The main physical properties of the bio-based composite materials prepared in Examples 1-3 and Comparative Example 1 were tested according to relevant testing standards, including tensile strength, elongation at break, flexural strength, flexural modulus, notched impact strength of cantilever beam, heat distortion temperature, and material cost. The testing standards and results are shown in Table 1 below.
[0078]
[0079] The test conditions and test strip dimensions are as follows:
[0080] The specimen size used for tensile strength testing is 172*10*4mm, and the tensile rate is 50mm / min; the specimen size used for bending strength testing is 80*10*4mm, and the bending rate is 2mm / min; the specimen size used for bending modulus testing is 80*10*4mm, and the bending rate is 2mm / min; the specimen size used for cantilever beam notched impact strength testing is 80*8*4mm; and the specimen size used for heat distortion temperature testing is 80*8*4mm.
[0081] As can be seen from the table, the tensile strength, flexural strength, impact strength, and heat distortion temperature of the bio-based composite materials prepared in Examples 1-3 are significantly higher than those in Comparative Example 1. This indicates that the present invention, through modification of plant fibers, significantly optimizes the interfacial compatibility between plant fibers and the polypropylene matrix, greatly improving the mechanical properties of the bio-based composite material. The plant fiber / polypropylene bio-based composite material prepared by the present invention uses polypropylene as the base material, mixed with talc, plant fibers, coupling agents, lubricants, and antioxidants. Under nitrogen protection, it is granulated by reactive extrusion. The resulting composite material particles have no obvious odor or blackening abnormalities, making them particularly suitable for applications in tableware manufacturing.
[0082] If functional additives such as ultraviolet light absorbers, light stabilizers, antistatic agents, and colorants are added to the preparation components of this invention to give the composite material corresponding properties, these additives are also protected by this invention.
[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.
Claims
1. A core-shell structured high-temperature resistant bio-based composite material, characterized in that, By weight, it comprises the following components: 50-60 parts polypropylene, 30-40 parts modified plant fiber, 10-20 parts inorganic filler, 0.1-0.3 parts silane coupling agent, 0.2-0.5 parts antioxidant, and 0.1-0.5 parts lubricant; The method for preparing the modified plant fiber includes: S1, the dried plant fibers are crushed, washed and dried; S2, add the dried plant fiber from S1 to a sodium hydroxide solution, soak and wash with alkali, then filter and dry; S3, dissolve the aluminum source in water, add hydrochloric acid as a catalyst, and stir continuously to form a sol; S4. The dried plant fibers from S2 are completely immersed in the sol prepared in S3 and stirred continuously to allow the sol to penetrate into the micropores of the plant fibers, thus obtaining a mixture. S5: Adjust the pH of the mixture in S4 to gel the surface and interior of the sol-gel plant fiber. After gelation, age, hydrophobize, and dry to obtain modified plant fiber powder.
2. The core-shell structured high-temperature resistant bio-based composite material according to claim 1, characterized in that, The polypropylene is at least one of syndiotactic polypropylene and atactic polypropylene; in S1, the plant fiber includes one or a mixture of straw, wheat bran, rice husk, wood flour and bamboo flour, and the mesh size of the pulverized plant fiber is 50-400 mesh.
3. The core-shell structured high-temperature resistant bio-based composite material according to claim 1, characterized in that, In S2, the sodium hydroxide solution has a mass fraction of 4-5%, and the solution is soaked at 40-50℃ for 2-3 hours.
4. The core-shell structured high-temperature resistant bio-based composite material according to claim 1, characterized in that, In S3, the aluminum source is at least one of aluminum isopropoxide, aluminum chloride, and aluminum nitrate.
5. The core-shell structured high-temperature resistant bio-based composite material according to claim 1, characterized in that, In S3, the aluminum source is dissolved in water at 80-100℃, the concentration of the added hydrochloric acid is 0.05-0.15mol / L, and the amount of added hydrochloric acid is used to adjust the pH to 2-3.
6. The core-shell structured high-temperature resistant bio-based composite material according to claim 1, characterized in that, The mass ratio of aluminum source, water in S3 and plant fiber added in S4 is plant fiber: aluminum source: water = 1:1:0.
5.
7. The core-shell structured high-temperature resistant bio-based composite material according to claim 3, characterized in that, In S5, the pH of the mixture is adjusted to 3-5 using a 0.15-0.25 mol / L sodium hydroxide solution.
8. The core-shell structured high-temperature resistant bio-based composite material according to claim 1, characterized in that, The inorganic filler includes at least one of magnesium oxide, talc, and mica; the silane coupling agent is at least one of butadienetriethoxysilane, vinyltrimethoxysilane, and vinyltriethoxysilane; the antioxidant is at least one of hindered phenols, thioesters, and phosphites; and the lubricant is at least one of polyethylene wax, stearate, and ethylene bis-stearamide.
9. The method for preparing the core-shell structured high-temperature resistant bio-based composite material according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: Add polypropylene, modified plant fiber, inorganic filler, silane coupling agent, antioxidant and lubricant together to a mixer under nitrogen protection and mix at high speed to obtain a mixture. Step 2: Under nitrogen protection, the mixture is fed into a parallel twin-screw extruder for melting, and then extruded and granulated to obtain a core-shell structured high-temperature resistant bio-based composite material.
10. The core-shell structured high-temperature resistant bio-based composite material according to claim 1, characterized in that, In step one, the high-speed mixing time is 5-15 min; in step two, the barrel temperature of the parallel twin-screw extruder is 170-190℃, the screw speed is 200-500 r / min, and the vacuum degree is -0.07~0.08MPa.