320 results about "Melt mixing" patented technology

The invention relates to the technical field of control systems, in particular to a melt mixing parameter real-time feedback control system for color master batch production. The method comprises the following steps: acquiring a corresponding process parameter reference through a parameter reference setting module; carrying out risk assessment through a grading module to obtain risk grades and carrying out grading processing; constructing a global optimization model through a control sequence module; a target evolutionary algorithm is started in combination with the technological parameter benchmark, and the technological parameter adjustment amount is calculated and a regulation and control sequence is generated by analyzing the dynamic coupling correlation among the technological parameters and the comprehensive influence on the whole; and finally, the process parameters are adjusted through a closed-loop control module, and real-time closed-loop feedback control is formed. The defects exist in real-time feedback and accurate control links of parameters in a color master batch melting and mixing process. Therefore, the invention provides a melt mixing parameter real-time feedback control system for color master batch production.

The invention relates to the technical field of injection molding waste plastic recovery, in particular to injection molding equipment and a process for producing plastic automobile ornaments. The equipment comprises an injection machine and an online recycling mechanism, the injection machine is provided with a double-channel solution cavity composed of a new material main runner and a waste material returning cavity, and the tail ends of the two channels converge in a 30-degree Y shape; the on-line recovery mechanism comprises a waste conveyor belt, a crushing mechanism and a transmission device, a magnetic separation impurity removal device is arranged in the crushing mechanism, and a discharge end is connected with the batching mechanism. Through double channels and a Y-shaped confluence structure, production waste is subjected to online recovery and crushing and then is fused, mixed and reused with new materials, the waste utilization rate is increased, and the cost is reduced. The magnetic separation and impurity removal device efficiently removes metal impurities through the movement of inclined avoiding, rotary impurity scraping and inclined discharging of a scraping plate; the batching mechanism removes dust to prevent impurities from affecting melt performance. The crushing device adapts to different waste materials, airflow assists discharging to improve the efficiency, and the green production concept is met.

The invention discloses a multilayer co-extrusion heat-shrinkable film and a preparation method thereof, the film comprises an outer wear-resistant layer, a middle support layer and an inner functional layer, the thickness ratio of each layer is 1: 3: 1-1: 5: 1, the total thickness is 50-150 [mu] m, and the raw materials are prepared according to respective formulas. The preparation method comprises the steps of raw material preparation, melt mixing, die head extrusion, two-way stretching, water-cooling shaping, electronic crosslinking, aging treatment, heating softening and cold and hot shaping. The carbon nanotubes (CNT) and the h-BN nanosheets synergistically hinder crack propagation in the middle layer, so that the crack propagation resistance of the film is remarkably improved, the tensile strength, the thermal shrinkage rate and other properties are also optimized, compared with a traditional film, the comprehensive properties of wear resistance, high strength and high thermal shrinkage rate are achieved through interface collaborative design, meanwhile, the production cost is reduced by 20-30%, and the application prospect is wide. The method is suitable for food packaging, electronic device protection and other fields.

The present application relates to the technical field of bio-based polymer material, and more particularly to a full bio-based PBAT-PLA copolymer, a preparation method and an application thereof, which is prepared by melt mixing bio-based polybutylene adipate terephthalate, bio-based polylactic acid and bio-based multi-epoxy chain extender through a twin-screw extruder, so that the tensile strength of the full bio-based PBAT-PLA copolymer is 31.5-44.3 MPa, and the elongation at break is 85-498%. The bio-based multi-epoxy chain extender prepared by specific selection can simultaneously improve the tensile strength and elongation at break of the full bio-based PBAT-PLA copolymer, and solve the technical problems of poor compatibility of traditional bio-based polylactic acid and non-bio-based polybutylene adipate terephthalate, and the technical problem that the addition of existing chain extenders cannot simultaneously improve the tensile strength and elongation at break of the copolymer.

The invention provides a high-wear-resistance and low-dilution gas shielded welding wire and a preparation method thereof, and belongs to the technical field of welding wire manufacturing. The welding wire consists of the following raw materials in parts by weight: 45-52 parts of iron; 18-22 parts by weight of an electrolytic nickel plate; 6-8 parts by weight of high-purity molybdenum powder; 4-6 parts by weight of nano tungsten powder; 3-4.5 parts by weight of a vanadium nitride alloy; 1.2 to 1.8 parts by weight of a niobium-iron alloy; 0.8-1.5 parts by weight of aluminum magnesium alloy powder; 0.3 to 0.6 part by weight of lanthanum cerium mixed rare earth; 0.15 to 0.25 part by weight of ferroboron alloy; 0.5 to 0.8 part by weight of metal silicon powder; 0.2 to 0.4 part by weight of a magnesium-calcium alloy; and 0.1-0.3 part by weight of titanium hydride powder. The hard framework is formed through gradient distribution of carbides such as molybdenum, tungsten and vanadium, the wear-resisting life is remarkably prolonged, melting mixing of base metal is reduced through the nickel-based alloy, the consistency of deposited metal components is ensured, free hydrogen is fixed through hydrogen trap phases such as titanium and niobium, and a moisture absorption path is blocked in combination with a surface passivation film.

The invention discloses a high-toughness PPR pipe machining device which comprises an extrusion system, a pulsation mixing system, a melt online monitoring device, a sizing cooling system, a traction device and a winding device. The extrusion system is used for melting and conveying raw materials, and the pulsation mixing system is used for deeply mixing a melt by utilizing a periodic disturbance structure, so that a toughening agent and a copolymerization component are more uniformly dispersed in the melt. The melt on-line monitoring device can detect the temperature, pressure and dispersity of the melt in real time, so that the extrusion process is monitorable. The sizing cooling system adopts a subsection cooling mode of rapid cooling, constant-temperature slow release and low-temperature shaping, and stable shape control is achieved through vacuum sizing. The traction device and the winding device are used for keeping the production rhythm stable and achieving continuous winding of the formed pipe. According to the invention, the melt mixing quality can be improved, the cooling internal stress is reduced, and the toughness and dimensional stability of the PPR pipe are improved.

The invention relates to a corrosion-resistant polypropylene modified plastic and a preparation method thereof, and belongs to the technical field of polypropylene plastic modification. The modified plastic is prepared from isotactic polypropylene, exfoliated montmorillonite, polyvinylidene fluoride powder, anhydride grafted polypropylene, a beta-crystal nucleating agent, diethyl aluminum chloride, peroxide, hindered phenol, phosphite ester and N, N-distearoyl hydroxylamine. The preparation method comprises the steps of low-shear melting and blending, high-shear supercritical COviscosity reduction, vacuum exhaust, bidirectional orientation, infrared local crosslinking, co-extrusion cooling and the like. The obtained material is excellent in tensile strength, elongation at break, low-temperature impact strength, strong acid corrosion resistance and the like.

The invention relates to the technical field of high polymer materials, and discloses a preparation method of a modified master batch degradable material and application of the modified master batch degradable material in a packaging lunch box, and the modified master batch degradable material comprises the following components by mass: 75.0-93.8 parts of poly (butylene succinate); 5.0 to 20.0 parts of aliphatic series-aromatic copolyester; 1.0 to 4.0 parts of 1, 1 '-methylenebis-4, 1-phenylene-bismaleimide, and 1.0 to 4.0 parts of 1, 1'-methylenebis-4, 1-phenylene-bismaleimide; 0.5 to 2.0 parts of talcum powder; the method comprises the following steps: mixing dried poly (butylene succinate), aliphatic-aromatic copolyester, bismaleimide and talcum powder, performing reactive extrusion and melt mixing through a twin-screw extruder, and then cooling, pelletizing and drying the extrudate. Through specific components and a reactive extrusion process, a dynamic cross-linked network is formed by utilizing a Diels-Alder reaction, and the modified master batch degradable material of which the comprehensive mechanical property and the heat resistance are remarkably improved is prepared.

The invention discloses a preparation method of a mute tube core layer and a mute tube. The preparation method comprises the following steps: step 01, adding 15-55 parts by weight of polypropylene resin, 0.5-10 parts by weight of a coupling agent, 0.5-5 parts by weight of a lubricant, 0.05-1 part by weight of an antioxidant and 0.1-3 parts by weight of other additives into a twin-screw extruder from a main feeding port of the twin-screw extruder, and melting and mixing to form an intermediate melt; 02, 45-85 parts by weight of barium sulfate is added into a double-screw extruder through at least two side feeding ports of the double-screw extruder, the barium sulfate and the intermediate melt are subjected to melt blending, and a blended melt is formed; and step 03, extruding the blended melt by a twin-screw extruder, and sequentially passing through a melt pump and a pipeline core mold to form the pipe core of the mute pipe. According to the preparation method, the filling proportion of barium sulfate is increased to 70% or above, the material density is larger than 2.4 g / cm < 3 >, and the noise test of a drainage pipe system of the mute pipe prepared through the preparation method is smaller than 20 dB.

The invention belongs to the technical field of glass materials, and particularly relates to black high-hardness heat-resistant microcrystalline glass ware and a preparation method thereof. Silicon dioxide, sodium oxide, aluminum oxide, potassium oxide, boric oxide, magnesium oxide, calcium oxide, zinc oxide, sodium fluosilicate, iron oxide, manganese oxide, fluorite, lithium oxide, metal manganese coated with silicon dioxide and schorlite are used as raw materials, and the black high-hardness heat-resistant microcrystalline glass ware is prepared through the processes of high-temperature melting and mixing, compression molding, annealing and tempering. The black high-hardness heat-resistant microcrystalline glass ware is excellent in performance, high in hardness and good in heat resistance, and has potential market value.

The invention relates to the technical field of spinning preparation, and discloses cool color master batch gradient blended spinning and a preparation method thereof.The preparation method comprises the steps that the proportion of cool master batches and color master batches is obtained, and the cool master batches and the color master batches are prepared; the preparation method comprises the following steps: performing nano coating treatment on a cool master batch and a color master batch to obtain an optimal synergistic ratio of the cool master batch and the color master batch, dynamically adjusting a blending ratio and a process path, performing programming regulation and control on a cool degree and color shade to execute a partitioned melting and mixing strategy, and performing staged functional component mixing; a gradient color distribution strategy is executed, material distribution in the fibers is adjusted, annular airflow is adopted for cooling, the cooling speed and the cooling flow direction are controlled, and the melt is rapidly shaped; comparing the actual parameters of the generated fiber structure with the target performance demand parameters, and judging whether the color distribution uniformity, the cool feeling performance index and the structural integrity meet preset standards or not; according to the scheme, the diversified requirements of the market for cool feeling and color can be better met.

A process for preparing a fiber reinforced thermoplastic is disclosed. The process includes melting a first thermoplastic and a second thermoplastic in a melting zone of a twin-screw processor, feeding at least one continuous fiber downstream of the melting zone into a melted mixture of the first thermoplastic and the second thermoplastic, incorporating the at least one continuous fiber into the melted mixture in a mixing zone, the mixing zone including at least one wave element having a continuous outer surface in the form of a helical wave, and obtaining the fiber reinforced thermoplastic from the twin screw processor. Further, a fiber reinforced thermoplastic composition prepared by an extrusion process the composition having a density between 1.3 g / cc to 1.7 g / cc and a flexural modulus of at least 4000 MPa is disclosed.

The present invention relates to a low-color-difference masterbatch and corresponding polyolefin products. The masterbatch is primarily suitable for coloring polyethylene and polypropylene films or injection-molded parts. The present invention uses an epoxidized polyalphaolefin (PAO) with a defined chemical structure as a dispersant. The epoxidized PAO has highly polar epoxy groups and non-polar long carbon chains, providing both dispersing and lubricating properties. This improves the compatibility of the carrier resin and the polar colorant, allowing for more complete melt mixing of the two. This results in lower color difference, more uniform coloring, more stable coloring performance, and bright, streaky-free color when used to color polyolefin products. Furthermore, it prevents yellowing of the polyolefin products at high temperatures.

This invention discloses a flame-retardant masterbatch and its preparation process, belonging to the field of polymer materials technology. The flame-retardant masterbatch comprises the following raw materials in parts by weight: carrier resin: 65-90 parts, modified magnesium hydroxide: 25-45 parts, colorant: 15-45 parts, dispersant: 1-5 parts, and antioxidant: 0.05-1 part. The preparation steps are as follows: S1, Weigh the carrier resin, modified magnesium hydroxide, colorant, dispersant, and antioxidant according to their weight proportions and add them to a high-speed mixer for uniform mixing to obtain a mixture; S2, Transfer the mixture to a twin-screw extruder, and after melt mixing, extrusion granulation, and drying, obtain the flame-retardant masterbatch. The prepared flame-retardant masterbatch has excellent flame-retardant and mechanical properties, and is stable and durable. Furthermore, the raw materials for preparing the flame-retardant masterbatch are readily available, the processing is simple, and it can be widely promoted.

A process for preparing a fiber reinforced thermoplastic is disclosed. The process includes melting a first thermoplastic and a second thermoplastic in a melting zone of a twin-screw processor, feeding at least one continuous fiber downstream of the melting zone into a melted mixture of the first thermoplastic and the second thermoplastic, incorporating the at least one continuous fiber into the melted mixture in a mixing zone, the mixing zone including at least one wave element having a continuous outer surface in the form of a helical wave, and obtaining the fiber reinforced thermoplastic from the twin screw processor. Further, a fiber reinforced thermoplastic composition prepared by an extrusion process the composition having a density between 1.3 g / cc to 1.7 g / cc and a flexural modulus of at least 4000 MPa is disclosed.

The invention relates to the technical field of plastic recycling, and discloses circulating nested plastic corner recycling injection molding equipment which comprises a machine base, a main machine barrel with a machine head at the left end is mounted at the upper end of the machine base through a mounting base, an exhaust screw is rotatably mounted on the inner wall of the main machine barrel, and a synchronous heating part is arranged on the outer wall of the exhaust screw. The circulating nested type plastic leftover material recycling injection molding equipment can effectively solve the problems that in the prior art, large-particle-size fragments which are not fully molten are prone to blocking a filter screen, a production line is forced to be frequently shut down to remove obstacles, the continuous production capacity is seriously restricted, particle size distribution dispersion of recycled leftover materials is high, and the production efficiency is high in the melting and mixing stage before injection molding. Due to heat conduction difference among particles, local plasticizing is insufficient or excessive degradation is caused, so that a final plastic product has apparent defects such as flow marks and mechanical property defects; and the recovered leftover material melt has high viscosity and is difficult to diffuse quickly after being directly put into a new plastic melt, so that the local concentration of the fused plastic melt is too high or too low.

The present invention relates to the technical field of foaming materials. Disclosed are a TPU supercritical foaming material and method for fabricating midsoles in footwear. According to the key points of the technical solution, the foaming material comprises the following raw materials in parts by weight: (1) 40-80 parts of polyol; (2) 20-50 parts of isocyanate; (3) 4-12 parts of a chain extender; (4) 0.1-30 parts of a modifier; and (5) a supercritical gas. The method for fabricating footwear midsoles from said raw materials comprises the following steps: S1, mixing, in the described parts by weight, the polyol, the isocyanate, and the chain extender, and compounding the resulting mixture in a twin-screw extruder to obtain a polymer melt; S2, preparing a supercritical gas by means of a gas inlet system, and then injecting the supercritical gas and the polymer melt into a single-screw extruder to prepare a molten mixture containing the supercritical gas; and S3, injecting the molten mixture into a mold, leaving it to stand, and then opening the mold to obtain the product.

The invention relates to the technical field of polyester material production, and discloses a polymerization method and system for producing chinlon 6 slices, and the provided chinlon 6 slices have the advantages of higher relative viscosity, narrower molecular weight distribution, lower water content, and higher yield. According to the system used by the invention, a ZnO / Al2O3 composite variable active catalyst adding window is directly arranged at the bottom of the melting and mixing unit 1, so that the ZnO / Al2O3 composite variable active catalyst can be ensured to be more uniformly dispersed in the whole reaction system, the reaction conditions are optimized, the variable active catalyst is adopted, the pH is dynamically regulated and controlled, and the reaction efficiency is improved. The exposure degree of active sites of the catalyst can be accurately adjusted according to the requirements of different stages of a polymerization reaction, generation of cyclic dimers in the caprolactam hydrolysis ring-opening process is effectively inhibited in the pre-polymerization stage, the content of cyclic by-products is remarkably reduced to 3.5% or below, the monomer utilization rate is increased, increase of the molecular weight is promoted in the post-polymerization stage, and the yield of the catalyst is increased. And product quality.

This application relates to the field of cable materials, specifically disclosing a low-smoke, low-halogen polyvinyl chloride (PVC) cable material and its preparation method. The material includes the following raw materials: polyvinyl chloride resin, EVM500 rubber, heat stabilizer, antioxidant, plasticizer, lubricant, filler, flame retardant, flame retardant synergist, and acrylate processing aids. The flame retardant includes a mixture of aluminum hydroxide and magnesium hydroxide, and the flame retardant synergist includes a zinc borate and ammonium octamolate-sepiolite composite. The preparation method includes the following steps: mixing the raw materials according to a specified ratio, then melting and mixing them, followed by granulation and extrusion molding to obtain the low-smoke, low-halogen PVC cable material. This application alleviates the problem of traditional PVC cable materials producing large amounts of black smoke and toxic gases during combustion, reduces smoke density, and improves the material's environmental performance and flame retardant properties.

A method for determining manufacturing conditions of a polyarylene sulfide resin composition uses a dataset to execute a machine learning algorithm, thereby determining, in a case where a characteristic value of a characteristic improvement target item of the polyarylene sulfide resin composition is used as a target variable, an item in which a degree of importance of a change in the characteristic value for the characteristic improvement target item among a plurality of items contained in manufacturing condition data and physical property measurement data is high, the dataset including the manufacturing condition data and the physical property measurement data, the manufacturing condition data including at least a compounding component of the polyarylene sulfide resin composition, a mixing condition, and a temperature of a compound during melt mixing as manufacturing condition items, the physical property measurement data including at least an impact resistance of the polyarylene sulfide resin composition manufactured according to the manufacturing condition shown by the manufacturing condition data as a characteristic value item.

The utility model discloses a kind of melting mixing devices for plastic product processing, including mixing shaft, multiple blades are equipped with outside mixing shaft, moving device is arranged outside mixing shaft, protective device is connected with the top of mixing shaft, protective device includes control sleeve, displacement spring, clamping groove, connecting rod, displacement sleeve, connecting sleeve, displacement slot, clamping block, displacement block and card frame, displacement spring is connected with clamping block and displacement block, clamping groove is opened in the outside of connecting rod, displacement sleeve outer wall is connected with the inner wall of control sleeve by thread, displacement slot is opened in connecting sleeve, clamping block is arranged in one side of card frame, locking mechanism is installed in the outside of connecting sleeve, and locking mechanism includes rotary hole, rotating plate, sliding sleeve, movable spring, fixed block, movable block and support rod, rotary hole is opened on rotating plate, support rod is connected in one side of sliding sleeve, the utility model solves the technical defects of existing equipment in cleaning maintenance difficulty, power transmission system lacks effective protection and adjustable overload protection mechanism poor stability etc.

The application discloses a disinfection and sterilization functional resin master batch, a preparation method and application. The disinfection and sterilization functional resin master batch comprises a disinfection and sterilization functional material, is prepared by adopting resin slices and the disinfection and sterilization functional material to melt and mix and form, the resin slice material is selected from at least one of PET polyester, PP propylene, PS polystyrene and PA6 nylon, and the disinfection and sterilization functional material is a porous inorganic titanium zirconium phosphate functional material. The porous inorganic titanium zirconium phosphate functional material in the disinfection and sterilization functional resin master batch prepared by the method is uniformly distributed, and the porous inorganic titanium zirconium phosphate functional material on the surface of resin fibers or non-woven fabric fibers prepared by adopting the functional resin master batch is uniformly distributed. The disinfection and sterilization functional resin master batch can be used for producing disinfection and sterilization resin fibers, non-woven fabrics, air conditioner water tanks, air conditioner evaporation tanks, air conditioner shells, injection molding keys, remote controller shells and the like.

This invention relates to the field of composite fiber preparation technology, and discloses an antibacterial composite fiber and its preparation method, comprising: melting and mixing an antibacterial functional component containing matrix affinity segments and surface migration segments with a matrix polymer component; maintaining their miscibility using high shear transport; triggering phase separation of the antibacterial functional component and its migration to the surface of the fiber nascent body during extrusion to release shear force; and subsequently applying a rapid curing treatment to lock the antibacterial functional component in the surface layer. This invention utilizes the physicochemical properties between components and the control of process timing to achieve active self-assembly of functional components in fiber forming. This method can prepare composite fibers on conventional spinning equipment, achieving targeted enrichment and firm anchoring of functional components to the surface while maintaining the core mechanical properties of the matrix.

The utility model discloses a melt mixing and distributing device of a plastic pipe extrusion die, and belongs to the technical field of plastic pipe extrusion. Comprising a spiral body used for conveying a molten material extruded by an extruder to a mold cavity of a mold; the spiral body is provided with a flow dividing section, a spiral section, a mixing section and a distribution section which are sequentially communicated from the feeding end face to the discharging end face, the spiral body is provided with a melt autorotation mixing area which is arranged in a concave mode in the mixing section, and melt materials output by the spiral section continuously rotate under the inertia effect and flow forwards to enter the melt autorotation mixing area. Melt materials flowing out front and back are stacked in the melt autorotation mixing area and rotate and extrude each other to be mixed, the mixed melt enters a mold cavity through the distribution section, the melt material mixing effect is guaranteed, meanwhile, the axial length of the spiral section is shortened, and the production efficiency is improved. The short spiral section means that the shearing and friction time of the melt material in the spiral section is shortened, and heat accumulation caused by long-time flowing in the spiral section is reduced.

The present invention relates to an in-situ melt mixing printing device and method for composite materials. The device includes a first feed section and a second feed section that are interconnected. The bottoms of the first feed section and the second feed section are both connected to a mixing and melting chamber, which is connected to a nozzle. The first feed section heats and melts plastic granules according to a set corresponding control instruction and then transports them to the mixing and melting chamber; the second feed section heats and melts chopped fiber pellets according to a set corresponding control instruction and then transports them to the mixing and melting chamber; the mixing and melting chamber is used to evenly mix the plastic granules and chopped fiber pellets and transport the mixed materials to the nozzle under the action of the chamber pressure. Compared with the existing technology, the present invention can achieve the filling of different performance materials in a specific area, and the carbon content in different positions can change in real time according to the stress information of the part, under the premise that the part meets the functional requirements, to obtain a part with a functional gradient material.

The present invention provides a method for preparing a phase change thermosetting resin for a heat dissipation composite, and a phase change thermosetting resin for a heat dissipation composite, which is prepared using same, the method comprising the steps of: mixing and melting an epoxy resin and a phase change compound so as to prepare a melted mixture; and adding a curing agent to the melted mixture and reacting same so as to induce an esterification bond between the thermosetting epoxy resin and the phase change compound. The phase change thermosetting resin is used as a matrix of various heat dissipation composites, and thus can improve excellent mechanical properties and heat dissipation properties of the composites.

The present invention relates to a polyolefin composition comprising a high melt strength polypropylene and a polyethylene wherein the high melt strength polypropylene is obtained or obtainable by a process comprising melt mixing a base polypropylene, a peroxide and a linear alpha-olefin composition comprising a linear C20 + alpha-olefin.

The present invention addresses the problem of providing a novel method for producing a recycled polystyrene-based resin composition, with which it is possible to provide a recycled polystyrene-based resin composition wherein physical properties deteriorated by processing are sufficiently recovered. This method for producing a recycled polystyrene-based resin composition comprises a mixing step for melt-mixing polystyrene-based resin waste and a high molecular weight polystyrene-based resin so as to obtain a resin composition, wherein the weight average molecular weight of the high molecular weight polystyrene-based resin is 500,000 to 5,000,000 inclusive.

The present invention discloses a method for preparing nano-metal oxides by thickening. The method comprises the following steps: heating and stirring a saccharide and an organic amine, adding a certain amount of a metal oxide precursor, and continuing to heat and stir to obtain a molten mixture; heating and carbonizing the molten mixture to obtain a dark brown fluffy solid; adding the dark brown fluffy solid to a barrier solution and stirring, wherein the barrier is a saccharide barrier or an inorganic salt barrier; evaporating the water in the solution to obtain a black solid; and calcining and washing the black solid to obtain the nano-metal oxide. The present invention places the barrier addition after carbonization, which allows for secondary dispersion of metal salts that are not fully dispersed during the stirring process, thereby improving the dispersion of the metal salts. The metal oxide has a lower dispersion in the carbon template, resulting in a larger size. The barrier is added later to fix the large-sized particles and prevent sintering and agglomeration due to insufficient stability during the calcination process caused by the reduction of the carbon template.

The invention belongs to the field of material packaging, and discloses a bamboo fiber biodegradable film material and a preparation method thereof.The preparation method comprises the following steps that bamboo leaves are dried and smashed and then added into an ethanol-toluene azeotropic mixture, heating extraction and filtering are performed to obtain filter residues, then the filter residues are added into a complexing agent-hydrogen peroxide-containing aqueous solution with the pH being 3.5-4, and stirring is performed to obtain a mixed solution; continuously heating and stirring, filtering, washing to be neutral, and drying to obtain a fiber raw material; the preparation method comprises the following steps: adding a fiber raw material and an acid catalyst into an excessive anhydride solution, heating and stirring, adding deionized water to adjust the conductivity of the solution to reach a preset value, filtering, washing and drying to obtain composite modified powder; adding the composite modified powder and a plasticizer into a reaction kettle, melting, mixing and blow-molding to obtain the bamboo fiber biodegradable film material. According to the preparation method, chlorophyll and ash in the process of extracting bamboo fibers from bamboo leaves are removed, and the toughness and barrier property of the bamboo fiber biodegradable film material are improved.