56 results about "Spherulite" patented technology

The invention provides a molecular perovskite energetic material spherocrystal and a preparation method thereof, and belongs to the technical field of energetic material preparation. On one hand, the particle size of a molecular perovskite energetic material is reduced through refinement, so that the sensitivity of the molecular perovskite energetic material is reduced, and the performance of the molecular perovskite energetic material is improved; on the other hand, the spheroidized growth of the crystal is controlled through the polymer, the friction sensitivity of the molecular perovskite energetic material is further reduced, the problem of high mechanical sensitivity of the molecular perovskite energetic material is effectively solved, and effective support is provided for expanding the practical application field of the molecular perovskite energetic material.

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 relates to the technical field of interface optimization of composite materials, and discloses an interface optimization method of a hollow micron silicon oxide sphere-aluminum nitride whisker composite material, which is applied to a material compounding system comprising a dispersity sensor and an interface regulation and control system in a hot pressing mold. The method comprises the following steps: acquiring spherocrystal dispersion data and interface stress data through a sensor to generate a data set, constructing a dispersion matrix by a regulation and control system, determining material interface combination characteristics, namely processing the matrix, performing thermal field distribution modeling, calculating thermal field distribution gradient and combination prediction information, constructing a coupling regulation and control model, outputting topological distribution characteristics and updating the data set. And finally dynamically regulating and controlling the composite parameters according to the combined characteristics. The method realizes real-time monitoring and accurate regulation and control of the composite material interface, improves the interface bonding quality and the material performance, and is suitable for interface optimization in the composite material preparation process.

The invention relates to the technical field of high polymer materials, and discloses a reactive phosphorus-nitrogen-containing graphene oxide flame retardant and a preparation method and application thereof. According to the invention, the phosphorus-nitrogen flame retardant and the graphene oxide are subjected to composite modification, and a phosphorus-nitrogen compound is grafted to the surface of the graphene oxide through chemical reaction, so that not only can the dispersity and compatibility of the graphene oxide in a polypropylene matrix be improved, but also the synergistic flame-retardant effect of the phosphorus-nitrogen flame retardant and the graphene oxide can be fully exerted; and the graphene oxide can reduce the size of the polypropylene spherocrystal. In addition, the reactive flame retardant can also improve other properties such as mechanical properties, thermal stability and the like of the material to a certain extent, and has a wide application prospect.

The application provides a high-drug-loading porous breviscapine crystal and a preparation method thereof. The crystal is prepared by a solvent diffusion method, does not contain auxiliary materials, and has high drug purity. The crystal is a highly porous, spherical, round, particle-size-controllable, large-particle-size crystal particle, and is easy to implement in an industrial scale. The process is green, and the crystal is crystallized in an aqueous solution. The solvents used can be recycled and reused. The porous breviscapine crystal prepared by the application has rapid in-vitro dissolution, improved flowability and compressibility, and is beneficial to further preparation molding.

The invention relates to a composite current collector and a lithium battery, the composite current collector comprises an organic polymer layer and a conductive layer which are laminated, the organic polymer layer comprises spherulites, in a slicing state, the maximum width of the spherulites is 2-20 [mu] m, the spherulites with the maximum width of 3-7 [mu] m are first spherulites, the spherulites with the maximum width of 3-7 [mu] m are second spherulites, and the spherulites with the maximum width of 3-7 [mu] m are third spherulites. The number of the first spherulites accounts for more than or equal to 40% of the number of all the spherulites. The mechanical strength and heat resistance of the composite current collector can be effectively improved by accurately controlling the sizes of the spherulites and the number proportion of the first spherulites. Appropriate spherocrystal size distribution can avoid local thermal stress concentration and reduce the risk of thermal deformation of the organic polymer layer when the battery emits heat, so that the safety performance of the battery is enhanced, meanwhile, stable combination of the conductive layer and the organic polymer layer is ensured, smooth current conduction is ensured, and the working reliability is ensured.

The invention relates to the technical field of biochemical engineering, in particular to calcium gluconate with a spherocrystal structure as well as a preparation method and application of the calcium gluconate. The calcium gluconate product with the spherocrystal structure can be prepared by adding 1.1 wt%-5 wt% of calcium carbonate ethanol water suspension into 5 wt%-20 wt% of gluconic acid ethanol water solution. Due to the unique spherocrystal structure, the calcium gluconate product has the remarkable advantages that the crystal form is regular, and the core performance of high dissolution rate, high bioavailability and good stability is achieved. The successful construction of the advantageous spherocrystal structure is characterized in that the reaction temperature, the reaction raw material input proportion, the concentration, the solvent system (ethanol-water) and the rotating speed are cooperatively regulated and controlled, and the regulation and control mechanism provides reliable technical support for stable formation of the spherocrystal structure. In addition, the preparation process disclosed by the invention is simple to operate, and has the advantages of environmental protection and no generation of pollutants.

The invention discloses a composite organic improving agent and a preparation method and application thereof. The composite organic improving agent is composed of one or more of monooxadiamide derivatives and one or more of bis-oxadiamide derivatives. The composite organic improver can be used for self-assembly heterogeneous nucleation to induce an ethylene polymer molecular chain to form a variant spherocrystal. The preparation method 1 comprises the steps of reacting oxalic acid diester with diamine, adding a solvent for dissolving, adding monoamine for reflux reaction to obtain a product, and the preparation method 2 comprises the steps of reacting oxalic acid diester with monoamine, adding a solvent for dissolving, adding diamine for reflux reaction to obtain a product. The composite organic improver is used as a polymer additive and has excellent effects of reducing turbidity, accelerating crystallization, improving mechanical properties and the like; and the preparation method is short in process, low in cost, few in raw materials and high in yield.

This invention discloses a method for the resource utilization of phosphate ore sintering flue gas that can efficiently recover fluorine and sulfur resources, reduce treatment costs, and create resource benefits. The method includes the following steps: sequentially subjecting the sintering flue gas to dust removal, denitrification, and heat exchange to obtain a first gas and dust; reacting the first gas with water to generate a first solid-liquid mixture containing fluorosilicic acid and silica gel, and a second gas; performing solid-liquid separation on the first solid-liquid mixture to obtain a first solid phase mainly composed of silica gel and a first liquid phase mainly composed of fluorosilicic acid; reacting the first liquid phase with sodium sulfate to generate a second solid-liquid mixture containing sulfuric acid and sodium fluorosilicate; and performing solid-liquid separation on the second solid-liquid mixture to obtain a second solid phase mainly composed of sodium fluorosilicate and a second liquid phase mainly composed of sulfuric acid.

The application discloses a kind of ground well valve barrel cylindrical valve body chip rotary extrusion friction semi-solid additive manufacturing device and process, device includes U-shaped frame, crossbeam, first nut motor composite mechanism, second nut motor composite mechanism, T-shaped disc type double rotor motor type male die, first nut motor composite mechanism, second nut motor composite mechanism etc.;When working, first put chip into mould cavity, by the "friction heat effect" generated by T-shaped disc type double rotor motor type male die "rotary extrusion friction" and valve body lower die "reverse rotation friction", the forming of first layer semi-solid spherulitic material valve body barrel wall is realized, then repeatedly additive iteration is realized to form valve body barrel wall, after turning T-shaped disc type double rotor motor type male die, ground well valve barrel cylindrical valve body parts are formed by "vibration, rotary extrusion friction" mode.This device is compact in structure, process is simple, and part material grain is small and uniform, and the organization is dense, high in strength, with good internal organization performance.

The utility model discloses a vortex oscillation type reactor for preparing mesenchymal stem cell spheres, which comprises a base, a motor and an oscillation support are mounted on the base, a cam is connected onto an output shaft of the motor, the motor drives the cam and the oscillation support to rotate synchronously, and a container bottle fixing support is mounted on the oscillation support through a spring. The container bottle fixing support is used for installing a replaceable container bottle, the motor is provided with a controller, and the controller is used for controlling the rotating speed, the forward and reverse rotation direction and timing start and stop of the motor. According to the utility model, the cells are inhibited from adhering to the wall in a special vortex oscillation mode, the cells are promoted to naturally gather to form spheres, the direct shear damage of mechanical stirring to the cells is reduced, and the cell activity and the sphere forming efficiency are improved; the rotating speed and the direction of the motor can be controlled, the vortex intensity and the oscillation frequency are accurately regulated and controlled, the structure is simple and compact, operation is convenient and fast, and the device is suitable for small laboratories.

This invention discloses an underwater cooling process that enhances the coupling properties of thermoplastic composites, belonging to the field of composite material processing technology. For thermoplastic composite parts that have just been removed from the mold and are in a high-temperature state, a specific cooling solution is used for jet cooling through an optimized nozzle system. The core of this process lies in the synergistic effect of forced convection, phase change cooling, and dynamic heat conduction. This rapidly reduces the overall temperature of the part (suppressing the formation of large-sized spherulites) while mitigating the temperature gradient in the interfacial region, promoting the full diffusion and entanglement of polymer chains to the surface of the reinforcing fibers within the viscous flow window, thereby optimizing interfacial bonding. By balancing crystallinity and residual stress, this process can increase the interfacial shear strength (IFSS) of the composite material by 15-20%.

The invention discloses a temozolomide spherocrystal based on nano confinement crystallization regulation and a method and application thereof. The preparation method of the temozolomide spherocrystal based on nano confinement crystallization regulation and control comprises the following steps: dissolving glycyrrhizic acid and temozolomide in pure water under an ultrasonic condition, adjusting the pH value to 3-4, heating until the solution is clear, and cooling to 0-5 DEG C under a stirring condition to obtain the temozolomide spherocrystal based on nano confinement crystallization regulation and control. Compared with the temozolomide raw material I crystal form, the temozolomide spherocrystal disclosed by the invention shows excellent nasal administration characteristics, including uniform particle size, high sphericity and excellent fluidity. Cell experiments show high cytotoxicity (IC50 = 51.9 [mu] g mL <-1 >) to glioblastoma, and in vivo experiments prove efficient brain targeting ability of the polypeptide. The preparation method has the characteristics of mild preparation conditions, easiness in process control, good reproducibility, high brain targeting property and the like, and is suitable for treating cancers delivered into the brain through the nose.

The invention discloses high-transparency low-isotacticity thermoforming polypropylene resin and a preparation process thereof, and relates to the technical field of polypropylene resin.The preparation process comprises the following process steps that polypropylene, a transparent nucleating agent, an antistatic agent, an antioxidant, a lubricating agent and an ultraviolet light absorber are subjected to melt blending, extrusion into sheets and thermoforming, and the thermoforming polypropylene resin is obtained; the thermoforming polypropylene resin also comprises modified polypropylene resin; the modified polypropylene resin is obtained by mixing and co-extruding polypropylene, a graft and peroxide. According to the invention, graft modified polypropylene is utilized, and a polar long-branched chain segment is introduced to a non-polar polypropylene molecular chain through a chemical method, so that steric hindrance is generated, local regular arrangement of methyl is destroyed, local conformation of polypropylene is disordered, movement of the polypropylene molecular chain is limited, crystalline regions are reduced, spherocrystal is refined, and light scattering and Mie scattering are reduced; and the transparency of the prepared polypropylene resin is improved.

The present application relates to a kind of composite current collector and lithium battery, the composite current collector includes the organic polymer layer and conductive layer of laminated arrangement, the organic polymer layer includes spherulite, in slice state, the maximum width of the spherulite is 2~20 μm, and the spherulite of maximum width 3~7 μm is first spherulite, the number of the first spherulite accounts for the number of all the spherulite ratio ≥40%.By accurately controlling spherulite size and the number of first spherulite ratio, the mechanical strength and heat resistance of composite current collector can be effectively improved.Suitable spherulite size distribution can avoid local thermal stress concentration, reduce the risk of organic polymer layer thermal deformation when battery heating, thereby enhancing the safety performance of battery, while ensuring that the conductive layer and organic polymer layer are combined firmly, guaranteeing smooth current conduction and ensuring reliable operation.

Membrane material for loudspeaker drivers and material for dust caps of loudspeaker drivers, characterized in that it consists of pure or at least very pure β-polypropylene. The material preferably consists of isotactic polypropylene homopolymer. The crystallinity of the material is preferably between 40% and 65%. The crystals (β-polypropylene crystals) preferably have a size of 10 µm to 20 µm. For a crystal size of 15 µm, the side length is approximately 7.5 µm and the two large faces each have a size of approximately 146 µm. 2 The crystal's height is approximately 2.6 µm and its volume is approximately 380 µm³. 3 . The spherulites (clusters of crystals) of the material preferably have a size of 300 µm to 1200 µm.

This invention discloses a heat-resistant polypropylene cable insulation material, its preparation method, and its application, belonging to the technical field of cable insulation materials. The insulation material is made by melt blending long-chain branched polypropylene (LCBPP) with an elastomer, wherein the mass ratio of LCBPP to elastomer is 70~90:10~30. Long-chain branching modification enhances the chain entanglement between molecular chains, inhibiting phase separation between polypropylene and elastomer during heat aging. Simultaneously, the dense spherulitic structure of LCBPP hinders oxygen intrusion, reducing the oxidation rate. After heat aging at 135℃ for 1440 hours, the carbonyl index increases by only 134.2%, the average POE size increases by 29.0%, the breakdown field strength decreases by ≤11.3%, the tensile strength decreases by ≤29.1%, and the elongation at break remains above 550%, meeting cable application standards. This solves the technical problem of poor heat aging performance of traditional polypropylene blend insulation materials and can be widely used in cable insulation under high-temperature environments.

The invention belongs to the technical field of crystal compounds, and particularly relates to a polylactic acid spherocrystal and a preparation method thereof. The invention provides a spherocrystal of polylactic acid, the spherocrystal is a novel crystal form of polylactic acid, in an X-ray powder diffraction pattern under Cu-K alpha radiation, characteristic peaks exist at diffraction angles 2theta of 17.9 + / -0.2 degrees, 20.2 + / -0.2 degrees, 23.5 + / -0.2 degrees and 32.7 + / -0.2 degrees, the crystal form does not contain crystal water or other crystal solvents, the particle size distribution is concentrated, the fluidity is good, and the spherocrystal is more suitable for industrial processing. The invention also provides a preparation process of the spherocrystal, which comprises the following steps: fully dissolving polylactic acid by using chloromethane, dropwise adding into an alcohol solvent, separating out polylactic acid in an alcohol system, and drying to obtain the spherocrystal. The preparation method is simple to operate, efficient and economical in cost, and has important significance on application of polylactic acid.

The invention relates to the technical field of cross-linked polyethylene overhead insulated power cables, and discloses a water-tree-resistant modified insulation process for a cross-linked polyethylene overhead insulated cable, which comprises the following steps: mixing a cross-linked polyethylene matrix and a polar modifier to generate a modified melt, introducing the modified melt into an extrusion flow channel provided with a convergence section, and carrying out extrusion molding to obtain the cross-linked polyethylene overhead insulated power cable. The extrusion resistance generated by the change rate of the convergence angle of the convergence section is utilized to induce the polar modifier to generate a layered grain orientation structure in the matrix, the layered grain orientation structure is frozen through gradient cooling, the cross-linking reaction heat is utilized to drive the polar modifier and the matrix to generate molecular chain segment interpenetration, and an interface cross-linked network is formed on a spherocrystal interface. According to the method, localized distribution of the polar modifier is realized by utilizing geometric constraint of an extrusion flow field, a continuous physical barrier is constructed in a matrix spherocrystal gap, a migration path of water molecules is blocked, a micro space for inducing water tree initiation is eliminated, and the aging resistance and charge purity of a cable insulation system are synergistically enhanced.

The invention provides a polyvinylidene fluoride membrane as well as a preparation method and application thereof, and relates to the technical field of materials. The preparation method of the polyvinylidene fluoride membrane provided by the invention comprises the following steps: coating a membrane casting solution on a base material to form a liquid membrane, staying a carrier in an environment of 30-80 DEG C for 1-5 seconds, immersing the carrier into a coagulating bath, curing to form a membrane, and washing with water to obtain the polyvinylidene fluoride membrane. The preparation method is environment-friendly, simple in process and low in cost, and the prepared polyvinylidene fluoride membrane has a dendritic-spherocrystal alternate porous structure and controllable membrane aperture, and can be used for biological application technologies such as western blot, sterilization and filtration.

The application discloses a kind of high transparency low isotacticity thermoforming polypropylene resin and its preparation process, it is related to polypropylene resin technical field, including the following process steps: polypropylene, transparent nucleating agent, antistatic agent, antioxidant, lubricant and ultraviolet absorber melt blend, extrusion into sheet, thermoforming, obtain thermoforming polypropylene resin;The thermoforming polypropylene resin also includes modified polypropylene resin;The modified polypropylene resin is obtained by mixing, co-extrusion of polypropylene, graft and peroxide.The application utilizes graft to modify polypropylene, introduces polar long branched chain segment on nonpolar polypropylene molecular chain by chemical method, produces steric hindrance, destroys the local regular arrangement of methyl, polypropylene local conformation disorder, polypropylene molecular chain movement is limited, crystallization area reduces, spherulite is refined, light scattering, Mie scattering reduces, and the transparency of the prepared polypropylene resin rises.

The present invention provides a novel method for preparing a composite graphite bipolar plate, comprising the following steps: (1) adding a thermosetting phenolic resin to a good solvent at a certain temperature and stirring to dissolve it; (2) adding a poor solvent and a bridging agent, stirring to diffuse the resin droplets into the poor solvent and crystallize them, filtering and drying to obtain resin spherulites; (3) calcining the resin spherulites for a period of time to solidify 90% of the resin and coat the resin surface with the remaining amorphous carbon; (4) blending the resin obtained in step (3) with graphite and then molding it, and then calcining the bipolar plate at 1000°C to convert the amorphous carbon into glassy carbon; (5) impregnating and curing the calcined bipolar plate to obtain the novel composite graphite bipolar plate. This method avoids the problems of slow resin curing rate and long curing time by adopting the resin spherulite molding method, facilitates blending with graphite, avoids the problem of uneven distribution, and improves the bending strength of the molded plate.

The application discloses a semi-solid closed precision extrusion-forging composite forming process of screw complex parts, and relates to the forming technical field of screw complex parts. The application first carries out cold radial forging plastic deformation on 304 stainless steel bars with a length of 600 mm and a diameter of 100 mm at room temperature, then carries out semi-solid isothermal treatment on the obtained stepped shaft radial forged bar to prepare a "stepped long shaft" semi-solid spherulitic material, and finally places the prepared "stepped long shaft" semi-solid spherulitic material in a lower die cavity, controls the mutual closing extrusion of the upper and lower dies, and then jointly forges left and right push rods, so that the semi-solid closed extrusion-forging composite forming of the screw complex parts can be realized. The application can prepare the screw complex parts with semi-solid spherulitic structure and forged deformation structure, and has the characteristics of simple process, small forming force, high material utilization rate, high product compactness and good mechanical properties.

This application discloses a short-process semi-solid closed-loop extrusion forging composite forming process for a scroll disk for a hydrogen circulation pump, relating to the field of scroll disk forming technology for hydrogen circulation pumps. First, the aluminum alloy cylindrical material required for forming the scroll disk is determined; then, the aluminum alloy cylindrical material undergoes cold heading rough deformation, and the cold-headed aluminum alloy billet is heated and held at a certain temperature to obtain a semi-solid fine spherulite material; next, the semi-solid fine spherulite material is quickly placed into the cavity formed by the outer and lower molds, and the upper mold is controlled to press down to extrude and deform the semi-solid fine spherulite material and hold the pressure, thereby forming a semi-solid scroll disk; finally, the upper mold is raised and controlled to forge the semi-solid scroll disk, ultimately obtaining a scroll disk part for a hydrogen circulation pump that simultaneously possesses a semi-solid spherulite structure and a forged deformed structure. This application features a simple process, low forming force, high material utilization, high product density, and good mechanical properties.

This invention provides a polyvinylidene fluoride (PVDF) membrane, its preparation method, and its applications, relating to the field of materials technology. The preparation method of the PVDF membrane provided by this invention includes: coating a casting solution onto a substrate to form a liquid film; then, holding the carrier in an environment of 30-80°C for 1-5 seconds; subsequently, immersing the carrier in a coagulation bath to solidify it into a film; and finally, washing with water to obtain the PVDF membrane. This preparation method is environmentally friendly, simple, and low-cost. The obtained PVDF membrane has a dendritic-spherulitic alternating porous structure with controllable pore size, and can be used in biotechnology applications such as protein imprinting and sterilization filtration.

The invention belongs to the field of biological medicine, and relates to a peptide-containing atomization conditioning composition, in particular to a composition comprising a cystic body wrapped by a biological membrane generated in mesenchymal stem cell culture. The invention provides an atomization conditioning composition. The atomization conditioning composition contains a bag-shaped body wrapped by a biological membrane, the cystic body wrapped by the biological membrane is generated in mesenchymal stem cell culture. The invention also provides a preparation method of the atomization conditioning composition. The nebulization conditioning composition acts on the lower respiratory tract of a conditioned person after being nebulized and inhaled, conditions breath, dredges obstruction, collapses stasis and energizes immunity, can effectively relieve lung cancer and tachypnea, fatigue and weakness, mobility inconvenience and great body function decline after lung cancer operation, is simple in use method, does not occupy space, and is suitable for popularization and application. Safety and reliability are achieved, and good experience of returning to normal life is brought to a user.

The invention discloses spherulitic cloxacillin sodium and a preparation method thereof, and belongs to the field of medicine synthesis. The spherocrystal is a spherical polycrystalline aggregate which is formed by radially growing towards each radial direction by taking a crystal nucleus as a center. The preparation method comprises the following steps: taking 6-APA, o-chloroacyl chloride and sodium isooctanoate as initial raw materials; the method comprises the following steps: adding water, NaOH and other solutions into 6-APA to form a 6-APA dissolving unit, then adding an o-chloroacyl chloride acetone solution to form an acylation unit solution, then adding dichloromethane, carrying out phase splitting, and then adding acetone into a lower layer phase to form an extraction unit solution; meanwhile, an acetone aqueous solution of sodium isooctanoate is used as a crystallization base solution. In the crystallization process, a part of the extraction unit solution is rapidly pre-added into a crystallization base solution, a seed crystal is added for pre-crystal growing, then the remaining extraction unit solution is added to complete a crystallization reaction and crystal growing, and the water mass is controlled to be 3%-8% in the crystallization process; and carrying out elution, filtration, washing and drying to obtain cloxacillin sodium spherulites. The method disclosed by the invention has the characteristics of easiness in suction filtration, low impurity content and high yield, and can obviously shorten the production period, improve the yield and improve the product quality.

The application relates to the technical field of high polymer materials, and discloses a spray-free high-gloss PP material and a preparation method thereof, which is prepared from the following raw materials in parts by weight: 100 parts of polypropylene resin, 8-18 parts of an acrylate core-shell structure copolymer, 0.1-0.3 parts of a beta crystal nucleating agent, 0.5-2 parts of nano-silicon dioxide, 0.1-0.5 parts of an antioxidant and 0.1-0.5 parts of a lubricant. The acrylate core-shell structure copolymer is used as a gloss modifier, the core layer of the acrylate core-shell structure copolymer provides elastic toughening for polybutadiene rubber, the shell layer of the acrylate core-shell structure copolymer provides high refractive index and good compatibility for polymethyl methacrylate, the beta crystal nucleating agent is used to induce the PP matrix to form fine beta spherocrystals, the material 60-degree gloss reaches more than 92% of the mirror surface high-gloss effect, and the problem of insufficient gloss of the spray-free PP material in the prior art is solved.

The present invention discloses a method for predicting the morphology of spherulites after crystallization based on DSC test results, comprising selecting representative cubic volume units, uniformly dividing the cubic unit grid into pixel point types, establishing a three-dimensional isothermal crystallization process crystal growth model of a semi-crystalline resin using a cellular automaton method, and inputting multiple sets of different parameters G and I based on the model to obtain the corresponding spherulite semi-crystallization time t. 0.5 The parameter ln(k) and the characteristic parameter t in the Avrami model of crystallization kinetics c The functional relationship between them is used to construct the average radius of the spherulites based on the multiple sets of different parameters G and I input above. <r>The functional relationship between the characteristic parameter Lc and the spherulite morphology after crystallization of semi-crystalline resin can be obtained by performing a simple DSC test on the material. 0.5 and the value of ln(k), the spherulite morphology after crystallization can be directly predicted through the obtained functional relationship, thus reducing the experimental time.< / r>

This invention discloses a high-transparency FDM 3D printing-specific PLA toughening filament, comprising, by weight: 96.7% PLA 101; 3% ATBC; and 0.3% compound antioxidant; wherein the compound antioxidant is prepared by compounding antioxidant 1010 and antioxidant 168 in a 1:1 ratio. A method for preparing the high-transparency FDM 3D printing-specific PLA toughening filament includes the following steps: the raw materials are vacuum dried and then mixed uniformly at 60℃ for 4 hours, directly fed into a single-screw extruder, with five temperature control stages of 180℃ / 190℃ / 200℃ / 205℃ / 215℃, a take-up speed of 100m / min, cooling water temperature of 60℃ in the first stage and 50℃ in the second stage, online diameter adjustment, and winding to obtain a 1.75mm±0.05mm filament. The invention achieves the following results: the oxidative degradation rate of PLA molecular chains is reduced by more than 65%, the average spherulite size is ≤5μm, and the crystallinity is controlled at 18%; the light transmittance of the consumable is ≥92%, the haze is ≤1.5%, the yellowing index ΔE after 72h accelerated aging is ≤1.0, the elongation at break is ≥12% (while also considering toughness), the printed parts have a smooth, hazy surface, the interlayer shear strength is ≥3.2MPa, and the dimensional accuracy is stable, meeting the requirements of high transparency scenarios such as medical models and transparent shells.