689 results about "Polypropylene composites" patented technology

The invention discloses a polypropylene composite material based on rare earth element modification and a preparation method and application thereof, and belongs to the technical field of medical instruments, and the polypropylene composite material comprises the following raw materials in parts by weight: 100 parts of medical grade PP, 3-8 parts of a rare earth organic complex, 5-10 parts of nano-hydroxyapatite, 2-5 parts of a maleic anhydride grafted PP compatilizer and 0.3-0.5 part of an antioxidant, the invention also provides specific preparation steps and application thereof. According to the invention, oxide + salt bimorphological rare earth and an organic ligand are complexed to form a rare earth organic complex, so that the problem of poor dispersity of inorganic rare earth is solved, and meanwhile, the material is endowed with antibacterial and antistatic functions; through a melt blending-in-situ fiber forming process, the rare earth complex forms gradient distribution in a polypropylene matrix, the surface layer is enriched with antibacterial components, and the inner layer is enhanced in mechanical property, so that a low-cost solution with high strength, antibacterial property and biocompatibility is provided for high-end medical instruments, and the market blank is filled.

The invention relates to the technical field of polypropylene, and discloses a high-strength polypropylene composite material as well as a preparation method and application thereof in an automobile bumper. The high-strength polypropylene composite material comprises the following components in parts by weight: 70-90 parts of polypropylene resin, 10-30 parts of polycarbonate resin, 25-40 parts of glass fibers, 3-10 parts of an allyl carbonate grafted polypropylene compatilizer and the like. The compatilizer contains carbonate groups similar to polycarbonate, so that the compatibility between polypropylene resin and polycarbonate resin is improved, and the compatilizer has higher mechanical properties. Moreover, the compatilizer contains carboxyl and can form interaction with the surface of the glass fiber, so that the compatibility between the glass fiber and the polypropylene resin is improved, the glass fiber has a better reinforcing effect, the tensile strength, the impact strength and the bending strength of the composite material are remarkably improved, and the compatilizer has good practical application in the aspects of automobile bumpers and the like.

The invention discloses a talcum powder filled regenerated polypropylene composite material and a preparation method thereof, and relates to the technical field of regenerated polypropylene. The talcum powder filled regenerated polypropylene composite material comprises the following raw materials in parts by mass: 100 parts of regenerated polypropylene, 15-18 parts of a nucleating agent, 8-10 parts of a cross-linking agent, 0.1-0.3 part of an initiator, 0.5-1 part of an antioxidant, 0.5-0.7 part of a light stabilizer and 1-2 parts of a lubricant. The regenerated polypropylene comprises a regenerated polypropylene master batch and a modified polypropylene master batch in a mass ratio of 1: (1-2); the nucleating agent comprises modified talcum powder and an organic carboxylate nucleating agent in a mass ratio of 50: (1-2). According to the regenerated polypropylene composite material provided by the invention, the mechanical property of regenerated polypropylene is remarkably improved, and the generation of volatile irritant gas after processing is reduced.

The invention discloses a carbon fiber / polypropylene composite material as well as a preparation method and application thereof, and belongs to the technical field of composite materials. The invention aims to regulate and control the interface structure and the adhesive property of the carbon fiber / polypropylene composite material. The preparation method comprises the following steps: firstly preparing a polyethyleneimine solution to soak carbon fibers, then preparing a suspension of a modified material to treat the carbon fibers, and carrying out temperature-controlled crystallization to prepare the carbon fiber / polypropylene composite material. The polyethyleneimine solution treatment is the key for the modified material to be adhered to the surface of the carbon fiber, the interface structure of the carbon fiber / polypropylene composite material can be effectively regulated and controlled by selecting the appropriate suspension concentration of the modified material, the interface bonding strength and the mechanical property of the composite material are improved, and the industrial application requirements are better met.

The invention discloses an interface covalently bonded core-shell structure boron nitride polypropylene composite dielectric material and a method. The interface covalently bonded core-shell structure boron nitride polypropylene composite dielectric material comprises a maleic anhydride grafted polypropylene matrix and a core-shell structure filler dispersed in the maleic anhydride grafted polypropylene matrix, the core-shell structure filler comprises hydroxylated boron nitride nanoparticles covalently grafted on a polymer shell layer on the surface of the core-shell structure filler; the polymer shell layer is polyglycidyl methacrylate; the epoxy group of the polymer shell layer reacts with the anhydride group of the maleic anhydride grafted polypropylene matrix to form a covalent bond. The invention has the characteristics of strong interface bonding force, uniform filler dispersion, and excellent comprehensive electrical properties and processability.

The invention relates to the technical field of polypropylene, and discloses a high-barrier polypropylene composite material and a preparation method thereof, the high-barrier polypropylene composite material comprises 55-80 parts by weight of polypropylene, 20-45 parts by weight of cardanol modified polystyrene, and 1.2-2 parts by weight of maleic anhydride grafted polypropylene; according to the invention, an alkyl long chain of cardanol is introduced into a side chain of polystyrene, and the alkyl long chain and polypropylene are subjected to a physical chain winding effect, so that a tight physical crosslinking is formed, the crosslinking density of a polypropylene molecular chain is improved, the water vapor permeability is reduced, and the barrier property is improved. The cardanol modified polystyrene contains hydroxyl groups and reacts with the compatilizer maleic anhydride grafted polypropylene, so that the compatibility between the polystyrene and the polypropylene is improved, the polystyrene and the polypropylene form an alloy system, higher mechanical properties are shown, and the tensile strength and the bending strength are improved.

The invention belongs to the technical field of composite materials, and particularly discloses a polypropylene composite material, a preparation method thereof and automobile interior and exterior ornaments.The polypropylene composite material is prepared from, by weight, 40-60 parts of first polypropylene resin, 15-25 parts of second polypropylene resin, 6-25 parts of flexibilizer, 18-23 parts of talcum powder, 0.1-1.5 parts of weather-proof agent and 1.5-3 parts of antioxidant; wherein the melt index of the first polypropylene resin is smaller than that of the second polypropylene resin; the mesh number of the talcum powder is 2250 to 5000. The polypropylene composite material has relatively high low-temperature impact resistance and relatively high rigidity, and can improve the safety performance of an automobile when being applied to interior and exterior ornaments of the automobile.

The invention discloses a nanofiber-containing polymer composite material and a preparation method thereof, and the nanofiber-containing polymer composite material is prepared from the following raw materials in parts by weight: 90-100 parts of polypropylene, 10-15 parts of nylon 6, 13-16 parts of a modified flame retardant, 4-7 parts of modified carbon nanotubes, 3-5 parts of a compatilizer, 0.5-0.8 part of an antioxidant and 0.3-0.5 part of a lubricant. According to the composite material, polypropylene and nylon 6 are blended, and a modified flame retardant prepared by a formulated method, a modified carbon nanotube, a synergistic compatilizer and other assistants are added, so that the defects that an existing polypropylene material is easy to degrade and inflammable, a traditional flame retardant and an antioxidant are easy to migrate and lose efficacy and the like are effectively overcome; according to the polypropylene composite material, the mechanical property of the material is maintained and improved while efficient flame retardance and excellent weather resistance and aging resistance (especially ultraviolet aging resistance) are achieved, the problem that in the prior art, performance in multiple aspects is difficult to consider is solved, and the application range of the polypropylene composite material is widened.

The invention discloses a bio-based polypropylene composite material, a preparation method of a vehicle door interior decorative plate structure, the vehicle door interior decorative plate structure and a vehicle, and relates to the technical field of vehicles, and the bio-based polypropylene composite material comprises, by mass, 38-42 parts of bio-based polypropylene; 35 to 40 parts by mass of homo-polypropylene; 7-10 parts by mass of a toughening agent; 2-3 parts by mass of a reinforcing agent; 10-20 parts by mass of a filler; 3-5 parts by mass of a compatilizer; and 0.3 to 0.5 part by mass of a lubricant. According to the technical scheme provided by the invention, the density of the decorative plate body can be reduced under the condition that the strength and the rigidity are ensured, namely, the weight of the decorative plate body is reduced, so that the carbon emission of the decorative plate body can be reduced while the light weight of the decorative plate body is realized.

The invention relates to the technical field of high polymer materials, and discloses a low-VOC (volatile organic compound) polypropylene composite material and a preparation process thereof, the low-VOC polypropylene composite material comprises the following raw materials: polypropylene, maleic anhydride grafted polypropylene, fluorenyl silicone oil, benzophenone coated talcum powder, activated carbon, an antioxidant, a plasticizer and a lubricant; the interface bonding force between a siloxane long-chain flexible structure and a polypropylene matrix material is improved by preparing fluorenyl silicone oil, the thermal stability of the composite material is effectively improved by combining fluorene rings, thermal decomposition products are reduced, VOC components are physically adsorbed and captured through a multilevel porous structure of activated carbon, VOC volatilization can be effectively reduced, and the environmental protection capacity of the composite material can be enhanced. Meanwhile, benzophenone-coated talcum powder is added into the polypropylene composite material matrix, so that the wear resistance and ultraviolet resistance of the polypropylene composite material matrix are enhanced, and the service life of the polypropylene composite material is effectively prolonged.

The invention relates to a biaxially oriented polypropylene composite film for a capacitor and a preparation method of the biaxially oriented polypropylene composite film. The biaxially oriented polypropylene composite film is of an ABA three-layer structure; wherein the layer A is prepared from the following raw materials: PP, a nucleating agent and a composite filler of MAH-g-PP and nanoparticles; the layer B is prepared from the following raw materials: PET master batch, modified silicon dioxide and a brush polymer. According to the preparation method, the three-layer structure composite film is prepared, the layers are firmly combined through covalent bonds, hydrogen-bond interaction and the like, and the interlayer peel strength is remarkably improved; a nano particle filler with a high dielectric constant is introduced into the A-layer structure, so that the dielectric strength of the film is improved, and meanwhile, the film has relatively high anti-breakdown strength; and the layer B effectively improves the mechanical stability of the film material, and has higher mechanical property and material rigidity compared with the traditional PP film.

The invention relates to the technical field of polypropylene composite materials, and discloses a high-strength antibacterial polypropylene composite material and a preparation method thereof, the polypropylene composite material comprises 60-90 parts by weight of polypropylene, 10-40 parts by weight of nylon 6, 2-8 parts by weight of maleic anhydride grafted polypropylene, 0.5-2 parts by weight of an arginine antibacterial agent and the like. The arginine antibacterial agent has good compatibility with polypropylene and nylon 6, is uniformly dispersed in the composite material, has little influence on the mechanical properties of the material, and can maintain very high tensile strength and impact strength. A side chain of the arginine antibacterial agent contains a large number of guanidyl antibacterial groups, and the arginine antibacterial agent is good in heat resistance, not prone to thermal decomposition, uniformly dispersed in a composite material matrix and capable of effectively killing staphylococcus aureus and escherichia coli, so that the composite material has very high antibacterial performance.

The invention discloses a polypropylene composite material as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The invention provides a polypropylene composite material. The polypropylene composite material comprises the following components in parts by weight: 40-80 parts of copolymerized PP (polypropylene), 5-25 parts of POE (polyolefin elastomer), 5-25 parts of polyisobutene and 10-30 parts of filler, the number-average molecular weight of the polyisobutene is greater than 600. The POE elastomer, the polyisobutene and the filler are introduced into the copolymerized PP, so that the polypropylene composite material with low sink mark characteristic and good mechanical property can be obtained.

The invention discloses a preparation technology for preparing a high-strength PP composite material based on waste plastic regeneration, and belongs to the technical field of regenerated PP composite materials. Cleaning and crushing the separated polypropylene plastic, adding the crushed polypropylene plastic, the maleic anhydride grafted polypropylene, the composite flame-retardant powder, the reinforcing agent, the modified organic silicon resin and the antioxidant 1010 into an internal mixer, carrying out melt blending, and discharging to obtain the high-strength polypropylene composite material. The polypropylene fragments, the composite flame-retardant powder, the reinforcing agent and the modified organic silicon resin are subjected to melt blending, so that the flame retardance, the oxidation resistance, the tensile strength and the cantilever beam notch impact strength of the regenerated polypropylene are further improved.

The invention discloses a recycled modified polypropylene composite material preparation system and a resource recovery method, and relates to the technical field of high polymer material science and engineering. The raw material pretreatment module adopts near infrared spectrum classification, multi-stage cleaning, drying and crushing, and the moisture content is controlled to be less than 0.5%; the melt blending module melts the materials at 180-220 DEG C, modifiers and additives are added, and vacuum degassing is performed to remove impurities; adding a reinforcing agent into the modification reinforcing module, and performing ultrasonic dispersion and dynamic vulcanization; the molding processing module is used for manufacturing a product through extrusion, injection molding or calendaring; the quality detection module is used for detecting mechanical and thermal properties; the waste recovery module is used for crushing and melting granulation to realize a closed loop; the intelligent control module uses a PLC to coordinate each module. Integrated treatment of waste polypropylene is achieved, the purity of raw materials and the performance of a composite material are improved, the resource utilization rate is increased through closed-loop recycling, manual intervention is reduced through intelligent control, product stability is guaranteed, economic and environment-friendly benefits are achieved, and high-valued circulation of waste plastic is promoted.

The invention relates to the field of modified polypropylene composite materials, and provides a polypropylene composite material based on graphene modification and a preparation method of the polypropylene composite material in order to solve the problem that the air permeability is poor while the antibacterial filtering performance of the polypropylene composite material is improved. Performing ultrasonic dispersion, filtering and drying to obtain a modified fiber body; adding graphene into the polypropylene melt, and blending to obtain a modified matrix; and dispersing the modified fiber body into the modified matrix, and preparing the polypropylene composite material through a forming process. The graphene is positioned in the airflow channel, so that the gas blocked by the graphene is easily guided to the airflow channel, the blockage of the airflow in the flowing process is reduced, and the air permeability is improved. Due to the fact that the flowing path of most airflow is guided to the airflow channel, and the airflow channel is just the gathering place of the graphene, the sterilization effect of the material in the airflow flowing process can also be improved.

The invention discloses a polypropylene composite material as well as a preparation method and application thereof. The polypropylene composite material comprises the following components in parts by weight: 50-80 parts of polypropylene resin; 4-10 parts of high density polyethylene; 5-15 parts of a polyolefin elastomer; 10 to 20 parts of talcum powder; 1 to 4 parts of polypropylene grafted polysiloxane; and 0.05 to 0.3 part of a beta crystal form nucleating agent. According to the polypropylene composite material disclosed by the invention, polypropylene is grafted with high-molecular-weight polysiloxane, and a specific nucleating agent is added, so that the crystal form of polypropylene is optimized, a more uniform microstructure is formed, a large spherocrystal boundary is reduced, a more uniform dispersion environment is provided for silicone molecules, local enrichment is avoided, and the mechanical property of the polypropylene composite material is improved. Therefore, the injection molding floating problem is effectively improved, and meanwhile, the high scratch resistance of the material is guaranteed. The high-performance polypropylene composite material which has excellent scratch resistance and good appearance at the same time is realized.

The invention discloses an impact-resistant cross-linked polyolefin composite cable material and a preparation method thereof, belongs to the technical field of cable material processing, and aims to solve the technical problem that the impact resistance and flame retardance of a cable material in the prior art need to be further improved. The flame-retardant polypropylene composite material specifically comprises the following components in parts by weight: 60-80 parts of modified polypropylene, 20-25 parts of a modified flame retardant, 5-8 parts of modified magnesium hydroxide, 10-15 parts of an ethylene-octylene copolymer, 1-2 parts of a chain extender, 0.5-1 part of an initiator and 8-12 parts of an auxiliary additive. The cross-linked polypropylene, the modified flame retardant, the modified magnesium hydroxide, the ethylene-octylene copolymer and the auxiliary additive are added into a double-screw extruder for melt extrusion and granulation to obtain the composite cable material, so that the impact resistance and flame retardance of the cable material are improved, and the toughness of the cable material is also improved.

The invention discloses a high-strength antibacterial polypropylene composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 100 parts of polypropylene, 15-25 parts of glass fiber, 1-8 parts of a compatilizer, 3-6 parts of unsaturated polyester, 1-5 parts of a stabilizer, 0.1-0.5 part of an initiator, 0.1-0.3 part of a metal ion antibacterial agent and 0.2-1.5 parts of an antioxidant, the stabilizer is selected from at least one of methyl methacrylate, acrylonitrile and divinyl benzene; the melting processing temperature of the polypropylene material is 160-175 DEG C. According to the invention, a micro-crosslinking structure is formed in the glass fiber reinforced polypropylene, so that the anisotropic shrinkage difference of the glass fiber reinforced polypropylene is effectively reduced, and the appearance quality defects caused by anisotropic characteristics of anisotropic shrinkage of the current glass fiber reinforced polypropylene material are reduced.

The invention relates to a biaxially oriented casting polypropylene composite film and a preparation method thereof, and belongs to the technical field of packaging materials. The homo-polypropylene, the co-polypropylene, the slipping agent, the nucleating agent, the antioxidant and the modified nano silicon dioxide are used as raw materials to prepare the biaxially oriented casting polypropylene composite film which can be used in the field of food packaging and has high transparency and good antistatic performance and ultraviolet resistance. The nano silicon dioxide is modified, and the ultraviolet light absorber is grafted on the surface of the nano silicon dioxide, so that the problem that the nano silicon dioxide is easy to agglomerate is solved, and the problem that the ultraviolet light absorber is easy to migrate is also solved; through quaternary ammonium salt structure conjugation, the ultraviolet light absorber has better ultraviolet light absorption performance and antistatic performance.

The invention discloses a polypropylene composite material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The polypropylene composite material is prepared from the following components in parts by weight: 44 to 60 parts of polypropylene resin, 5 to 15 parts of ethylene-vinyl alcohol copolymer, 10 to 25 parts of modified talcum powder and 15 to 25 parts of toughening agent. The polypropylene resin, the ethylene-vinyl alcohol copolymer, the modified talcum powder, the flexibilizer and the antioxidant are compounded, the compatibility of all the components is good, the compounded material has good bonding performance with other plastic materials (such as PMMA), meanwhile, the tensile strength and impact strength of the polypropylene composite material can be effectively improved, and the service life of the polypropylene composite material is prolonged. The requirements of automobile decorative parts on the adhesive property, the rigidity and the toughness can be met.

A composite material includes a plurality of polypropylene sheet layer unit groups that are sequentially stacked; each polypropylene sheet layer unit group comprises at least one of the same or different polypropylene sheet layer units, the structure of each polypropylene sheet layer unit is BiAiB′i; the structure of the polypropylene composite material is . . . i-th group, . . . second group, first group, second group, . . . i-th group, . . . ; the melting point of polypropylene composition Ai is greater than the melting point of polypropylene compositions Bi and B′i; and the average value of the melting points of all outer layers in the i-th group is greater than the average value of the melting points of all outer layers in an (i-1)th group. The polypropylene composite material has a very good tensile property and very good impact resistance, and also has good interlayer stripping strength at a relatively low hot-pressing temperature.

The invention relates to a high-fluidity injection molding polypropylene composite additive, which belongs to the technical field of high polymer material modification, and through the synergistic effect of a plurality of additives, on the premise of keeping the basic mechanical properties and thermal properties of polypropylene, the melt flow rate is obviously improved, and the processability is improved. Meanwhile, the problems of unbalanced performance, complex adding system and the like in the prior art are solved, and the effect is remarkable.

The invention discloses a high-rigidity and high-toughness polypropylene composite material and a preparation method thereof, the high-rigidity and high-toughness polypropylene composite material comprises 55-70 g of homo-polypropylene, 10-20 g of anti-impact co-polypropylene, 18-25 g of surface modified talcum powder, 3-6 g of chopped glass fiber, 8-12 g of ethylene-octylene copolymer, 3-5 g of maleic anhydride grafted polypropylene, 0.5-1.0 g of polyethylene wax, and 0.3-0.5 g of an antioxidant 1010 and 168 (1: 1) mixture. The invention realizes the following effects: 1, a robust rigid-tough balance design: a reinforcing system with high-content talcum powder as a main body and low-content glass fiber as an auxiliary is adopted to cooperate with a POE (ethylene-octylene copolymer) flexibilizer, so that good low-temperature impact toughness is maintained while the bending modulus stably reaches 2500MPa or above; 2, interface compatibility optimization: the interface combination of the inorganic filler and the matrix is improved through PP-g-MAH, and the dispersity and the mechanical property stability are improved; and 3, process control: through optimized temperature and vacuum degree control, degradation is prevented, good performance reproducibility is ensured, and industrial production is easy.

The invention relates to the technical field of high polymer material modification, in particular to a top whitening resistant polypropylene composite material as well as a preparation method and application thereof. The top whitening resistant polypropylene composite material is prepared from the following components in parts by weight: 60 to 80 parts of polypropylene resin, 20 to 30 parts of talcum powder, 5 to 15 parts of hydrogenated styrene-butadiene-styrene block copolymer, 0.1 to 0.5 part of beta crystal form nucleating agent, 3 to 8 parts of maleic anhydride grafted polypropylene, 0.3 to 1 part of composite antioxidant and 0.5 to 2 parts of zinc stearate. Through the synergistic effect of the hydrogenated styrene-butadiene-styrene block copolymer toughening system and the beta crystal form nucleating agent in a specific formula, high rigidity (the filling amount of talcum powder reaches 20-30 parts) is kept, and meanwhile, the top whitening resistance of the composite material is remarkably improved; the method is suitable for parts such as automobile dashboards and door plates which have strict requirements on surface quality.

The embodiment of the invention discloses a preparation method of flame-retardant fiber, which comprises the following steps: mixing a matrix material, a flame retardant, a compatilizer and a coupling agent to form a premix, the matrix material being polypropylene fragments or particles; putting the premix into a double-screw extruder to generate flame-retardant polypropylene composite material particles; the flame-retardant polypropylene composite material particles are subjected to chemical crosslinking, melting, spinning, cooling, stretching and winding to generate flame-retardant fibers.

The invention discloses a method for improving tiger wrinkle defects of a polypropylene composite material injection molding product. The method comprises the following steps: firstly, melting and plasticizing a blended polypropylene composite material, and then applying a rotation and reciprocating oscillation composite shearing external field on a plasticized blend melt to carry out disentanglement treatment on the plasticized blend melt, the low-entanglement-degree polypropylene composite material is subjected to injection molding to obtain a workpiece with obviously improved tiger skin patterns on the surface. According to the method disclosed by the invention, a shearing external field compounded by rotation and reciprocating oscillation is applied to a blend melt to destroy an entanglement network of a molecular chain, so that not only is the molecular chain effectively disentangled, but also a low-entanglement state is retained in granules, the viscosity of the melt is greatly reduced during subsequent injection molding, and the flowability is remarkably enhanced; and the occurrence of unstable flow in the mold filling process is delayed, so that the tiger skin defect on the surface of a polypropylene composite material injection molding product can be greatly improved on the premise that the good mechanical property of the product can be maintained.

The invention relates to an environment-friendly polypropylene composite material applied to a direct-current cable and a preparation method of the environment-friendly polypropylene composite material. The material comprises atactic polypropylene, a styrene-ethylene-butylene-styrene block copolymer (SEBS), a grafted nano inorganic oxide and an antioxidant. The preparation method comprises the following steps: grafting an elastomer styrene-butadiene-styrene copolymer (SBS) to a nano inorganic oxide through a ball-milling mechanochemical method, and blending the nano inorganic oxide with a polypropylene random copolymer and SEBS to prepare the PP composite material applied to the direct-current cable material. The PP composite material is characterized in that the PP composite material with better low-temperature toughness, higher direct-current breakdown strength and higher flashover voltage is prepared by using an environment-friendly and efficient modification method, and the requirements of direct-current cable application scenes are better met.

The present invention relates to the field of polypropylene technology, and discloses a high-strength polypropylene composite material and preparation method and application in automobile bumper, 70-90 parts by weight of polypropylene resin, 10-30 parts by weight of polycarbonate resin, 25-40 parts by weight of glass fiber, 3-10 parts by weight of allyl carbonate grafted polypropylene compatibilizer etc. The compatibilizer contains a carbonate group similar to polycarbonate, improves the compatibility between polypropylene resin and polycarbonate resin, and has higher mechanical properties. And the compatibilizer contains a carboxyl group, can form an interaction with the glass fiber surface, improves the compatibility between glass fiber and polypropylene resin, makes glass fiber have better reinforcement, significantly improves the tensile strength, impact strength and flexural strength of composite material, and has good practical application in aspects such as automobile bumper.

The invention discloses a bio-based degradable continuous fiber reinforced polypropylene composite material and a preparation method thereof, and belongs to the technical field of high polymer material modification. The bio-based degradable continuous fiber reinforced polypropylene composite material is prepared from the following raw materials in parts by mass: 50 to 70 parts of polypropylene resin, 20 to 40 parts of bio-based degradable fiber, 5 to 10 parts of compatilizer, 1 to 3 parts of coupling agent and 0.5 to 2 parts of auxiliary agent. The bio-based degradable fiber is subjected to pretreatment and surface modification, and the compatilizer is added, so that the compatibility and interface bonding force of the bio-based degradable fiber and a polypropylene matrix are improved, the composite material has excellent mechanical properties and environmental protection performance, and the preparation method is simple and suitable for industrial production.