210 results about "Shear thinning" patented technology

The invention discloses a near-infrared responsive injectable MXene / fibroin / carboxymethyl chitosan / oxidized hyaluronic acid nano composite hydrogel SCO (at) M, and relates to the technical field of biomedical materials. The method disclosed by the invention comprises the following steps: 1) preparing an MXene single-layer nanosheet by adopting LiF-HCl in-situ HF etching; (2) modifying the fibroin through glycidyl methacrylate to obtain SF-MA; 3) oxidizing hyaluronic acid with sodium periodate to obtain oxidized hyaluronic acid OHA; (4) uniformly dispersing MXene in the SF-MA solution, and sequentially adding carboxymethyl chitosan CMCS and OHA, so as to prepare the injectable nano composite soft hydrogel with the shear thinning characteristic; and 5) through ultraviolet irradiation crosslinking, rapid in-situ curing of the hydrogel is realized, and the mechanical strength of the hydrogel is improved. The hydrogel provided by the invention has excellent injectability and mechanical property, has good photo-thermal antibacterial property, oxidation resistance and cell compatibility, can be used as a carrier of cells, medicines and bioactive substances in the field of biological medicines, and has a wide application prospect.

The invention provides an anti-sticking slag coating based on regenerated alumina powder, and relates to the technical field of coatings, the anti-sticking slag coating comprises regenerated alumina powder, an adhesive, a dispersing agent, a thickening agent, a rheological agent and other assistants.The regenerated alumina powder is adopted as a main component, aluminum oxide is used for promoting hydrolysis-condensation reaction of an adhesive precursor, and the anti-sticking slag coating is prepared. An inorganic gel network is formed, normal-temperature curing is achieved, the adhesion situation is remarkably reduced after molten steel and molten aluminum pouring faces are sprayed, and the product performance is excellent; a dispersing agent, a thickening agent and a rheological agent are used for synergistically finishing rheological property regulation and control of the anti-sticking slag coating, a'shear thinning 'flow pattern is constructed, the viscosity is suddenly reduced during spraying so as to realize atomization, the viscosity is increased after spraying, and the anti-sticking slag coating is particularly suitable for uniform film forming of furnace bodies in complex shapes; in the formula, the regenerated aluminum oxide and the selected auxiliaries such as the adhesive, the thickening agent and the rheological agent do not contain volatile organic compounds such as benzene and formaldehyde, the product is free of pungent smell in the spraying process, and the environment-friendly performance of the product is particularly good.

The invention discloses a compression molding method for regenerating a modified tray from waste polyethylene plastics, and relates to the technical field of waste plastic resource utilization. Comprising the steps that S1, a granular waste polyethylene material subjected to multi-stage crushing, cleaning, flotation separation and hot air drying treatment is obtained, and the average particle size of the granular material ranges from 3 mm to 8 mm; and S2, mixing the waste polyethylene material with 0.1%-5% by mass of a melt strength modifier, 0.05%-3% by mass of a rheological additive and 0.01%-1% by mass of an antioxidant according to a ratio, wherein the mixing process is completed in a high-speed mixer. Granular waste polyethylene subjected to multi-stage crushing, cleaning and the like is mixed with a melt strength modifier, a rheological additive and an antioxidant, and a molecular chain degraded by the waste polyethylene is repaired by using a branching agent containing multiple reactive functional groups and a chain extender so as to improve the melt strength; the flowability is precisely controlled by means of a rheological aid having shear thinning properties.

The present application belongs to the technical field of geotechnical engineering and indoor test, and provides a visual test device and method for interaction between high-pressure rotary jet flow and soft soil, which comprises a detachable model box, a jet medium simulation system, a high-pressure rotary jet flow generation system, an overburden pressure simulation system, a data acquisition system and a tracing system.The test device has the advantages of high visual degree, detachability, easy assembly and easy production.The jet medium simulation system has significant shear thinning characteristics, and has a high degree of reduction of the non-Newtonian fluid properties of cement slurry, which not only overcomes the problem of easy blockage of the pipeline, but also avoids distortion defects.The trajectory of the fluorescent powder particles in the jet medium simulation system can be captured by a high-speed camera under the irradiation of the pulsating laser beam generated by the pulsating laser, so as to accurately reproduce the flow field information of the high-pressure rotary jet flow in the soft soil.

The present application relates to the technical field of hydrogel, in particular to an injectable temperature-responsive enhanced composite double-network magnetic particle gel, a preparation method and application thereof, the hydrogel is composed of a particle gel network formed by gelatin nanoparticles and Fe3O4 nanoparticles through electrostatic interaction and a poly-N-isopropyl acrylamide (PNIPAM) based temperature-sensitive polymer gel network. At room temperature, the hydrogel has excellent shear thinning and self-healing properties, and can be easily injected through a needle and a microcatheter. When the temperature rises to human body temperature (37 DEG C), the temperature-sensitive polymer phase transition crosslinking enhances the mechanical properties of the gel network. The hydrogel is injectable in vitro, temperature-responsive in vivo, meets the requirements of vascular interventional embolization materials, and can be magnetically heated under an alternating magnetic field, and is used for liver cancer embolization combined with magnetic heating treatment. The preparation method is simple, has high biocompatibility, and has great clinical application potential.

We have developed novel shear-thinning biomaterials using silica nanoparticles, gelatin-based polymers and small molecules such as doxorubicin. Shear-thinning biomaterial technology offers enables polymers and drugs loaded inside such polymers to be easily delivered directly through catheters into target area for use, for example, in cancer therapy and immunotherapy. When a force above a certain threshold is applied to inject such materials, they “thin” and behaves as a semi-solid, allowing the material to readily flow through a catheter. When the force is removed, the material instantly becomes a soft solid with significant cohesive properties that prevent it from dislodging or breaking up.

This invention discloses a display device and a control method for the display device, relating to the field of display technology. The display device includes a scroll and a screen body connected to the scroll at one end. The display device also includes a first driving layer and a second driving layer, which are attached to each other and disposed on the back of the screen body. The first driving layer is an elastic memory layer and is naturally curled. The second driving layer includes a first flexible liquid reservoir, a second flexible liquid reservoir, and a power pump. The first flexible liquid reservoir is located on the side of the second driving layer closest to the scroll. The second flexible liquid reservoir is located on the side of the second driving layer away from the scroll and communicates with the first flexible liquid reservoir. A shear-thinning fluid is disposed within the first and / or second flexible liquid reservoirs. A power pump is disposed within both the first and second flexible liquid reservoirs, and the power pump drives the shear-thinning fluid to flow between the first and second flexible liquid reservoirs. This invention can reduce the risk of creases appearing on the display screen.

The present invention relates to an injectable high-strength hydrogel for bone tissue repair and a preparation method thereof. A poly(hydroxyethyl acrylate-methyl acrylate) random copolymer is prepared by solution polymerization. The copolymer is fully swollen in water to obtain a physically cross-linked hydrogel. The hydrogel is injectable and gelled in vivo under shear thinning. The gel exudation is enhanced under physiological conditions. Bioactive glass that can form hydrogen bonds with the copolymer is mixed to prepare the injectable high-strength hydrogel. The hydrogel can not only provide good support for the bone defect site, but also promote the proliferation and differentiation of cells therein. The hydrogel of the present invention is simple to prepare, easy to operate, quick to respond, good in biocompatibility, has good self-repair ability, is injectable, and has little minimally invasive damage. It has good application prospects in the field of irregular bone defect repair.

The patent provides a MXene / CC / PEDOT:PSS high-conductivity ink and a preparation method thereof, and further prepares a high-performance flexible micro-supercapacitor through a 3D printing technology.The application takes the conductive polymer PEDOT:PSS as a spacer between MXene nanosheets, effectively prevents the stacking of MXene nanosheets, and provides more conductive paths.The mutual interaction between CC and MXene through hydrogen bonds and ionic bonds promotes the interface bonding force between them, resulting in high yield stress and unique shear thinning behavior.The "soft inside and hard outside" structure of CC improves the mechanical properties of the electrode and provides a certain capacity.The micro-supercapacitor prepared by the 3D printing technology has excellent electrochemical performance due to the synergistic effect of the electrode material and the unique structure, and has great application potential in the field of flexible energy storage.

This invention relates to the field of metal surface treatment technology, and discloses a magnesium-silver alloy cleaning agent and its preparation and cleaning methods, comprising: a shear coupling step, in which dodecylamine and organophosphonic acid are mixed in an alcohol ether solvent at 60-65℃ and 2500-3000rpm under high shear to construct a high-energy acid-amine assemblage; a hysteresis locking step, in which the shear rate is maintained constant and the temperature is lowered to 35-40℃ at a rate of 1.5-2.0℃ / min to inhibit crystallization and lock it into a metastable precursor; and a dispersion stabilization step, in which a nonionic surfactant is added and dispersed to a semi-transparent state. This invention utilizes the rheological antagonistic mechanism of shear thinning and cooling viscosity increase to construct a metastable system with synchronous transport characteristics, eliminates the kinetic lag caused by preferential solvent wetting, realizes zero-time-difference synchronous adsorption of corrosion inhibitor and solvent on the magnesium-silver interface, and improves the storage stability of the cleaning agent.

To provide a water-based ink composition for a ballpoint pen, which is excellent in dry-up resistance and can form clear handwriting, and to provide a ballpoint pen containing the ink composition.SOLUTION: An aqueous ink composition for a ballpoint pen, comprising: a colorant; an alkyl polyglucoside having a C8 to C14 aliphatic-hydrocarbon group; a shear-thinning agent; and water. The colorant contains a reversible thermochromic microcapsule pigment containing a reversible thermochromic composition comprising at least (a) an electron-donating color-developing organic compound, (b) an electron-accepting compound, and (c) a reaction medium for determining the temperature at which the color development reaction of the components (a) and (b) occurs.SELECTED DRAWING: None

A precision coating composition that includes organic solvents and film-forming constituents, where the coating composition has a shear thinning rheological profile; and where under a shear rate of 0.1 s−1, the coating composition has a viscosity of from 1,000 cps to 30,000 cps measured using an Anton Paar MCR 301 or Anton Paar MCR 302 rheometer with a Double Gap Cylinder equipped with a DG26.7 measuring system at 25° C. The precision coating composition can be applied to a substrate using a precision applicator to form a coating layer over at least a portion of a substrate; and exposing the coating layer to a sufficient amount of energy for a sufficient amount of time for the coating layer to coalesce to form a uniform coating on the substrate, where the amount of energy does not cause an appreciable cure of the precision coating composition.

A method (200) of distributing food particles (112) in a liquid food product (110) held in a vessel (100). The vessel comprising an agitator arrangement (150) for circulating the particles and the liquid in the vessel, to thereby generate a circulating flow (F) in the vessel. The method comprising: receiving (S202) the liquid food and the particles in the vessel, and actuating (S204) the agitator arrangement to generate the circulating flow, thereby distributing the particles homogeneously in the liquid. The liquid food product is a non-Newtonian shear thinning liquid food product having a flow consistency index K in a range of 7-14 Pasn and a flow behavior index n in a range of 0.25-0.50. The food particles have an average particle size in a range of 5 to 20 mm. At least 90% of the food particles have a size in the range of 5 to 20 mm.

The invention relates to a silica hydrogel composite, which is shear thinning. The silica hydrogel composite comprises a) up to 85 weight-% of silica particles having a maximum diameter of ≤1000 µm, and b) a silica sol having a silica content of ≤5 weight-%. According to the invention the silica particles comprise an encapsulated agent selected from a GLP-1 receptor agonist, a dual GIP / GLP-1 receptor agonist, or a triple GIP / GLP-1 / GCG receptor agonist.

The invention discloses a nasal cavity biological protection preparation, a preparation method and application thereof and a nasal cavity intelligent protection system. The formulation comprises a mucin inspired polymer having a specific "brush-like bottleneck" molecular configuration, and an interpenetrating network formed from oppositely charged polysaccharides, which construct a three-dimensional hydrated gel by dynamic non-covalent cross-linking. The gel has the characteristics of shear thinning, strong mucous membrane adhesion and efficient particle interception. Temperature-sensitive, pH-sensitive or oxidation-reduction-sensitive intelligent microspheres can also be integrated in the preparation, so that responsiveness protection to the external environment is realized. The invention further provides an intelligent protection scheme comprising the preparation, a quantitative spraying device and a simple monitoring system. The preparation is safe and free of medicine, is suitable for preventing nasal cavity discomfort caused by air pollution, allergens, viruses and environment dryness, and is especially suitable for daily health protection under high-risk environment or extreme weather conditions.

The invention relates to the technical field of high-performance thermoplastic composite material manufacturing, in particular to production equipment for polyether-ether-ketone processing. The device comprises a precise fiber broadening conveying unit, a preheating unit, a dynamic rheological dipping coupling unit and a crystallization shaping unit; the system applies vibration or ultrasonic waves through a high-frequency vibration energy generating device, and the thixotropic effect is induced on the resin and fiber interface; the method is characterized in that the viscosity of the resin is instantaneously reduced by utilizing the shear thinning characteristic, so that the resin permeates into fiber gaps under low macroscopic pressure; according to the invention, the contradiction between high-pressure fiber damage and low-pressure infiltrating difficulty is solved, and low-pressure, lossless and deep impregnation of compact carbon fibers by high-viscosity resin is realized.

This invention belongs to the field of cemented carbide additive manufacturing technology and discloses a method for preparing a high-solids WC-Co water-based slurry for direct-write forming. The invention uses cobalt-coated tungsten carbide powder as the solid phase, which is dispersed in an aqueous solution of ammonium citrate and polyethylene glycol composite additives to obtain a WC-Co water-based slurry with a solid content of 90wt%~93wt%. The slurry of this invention exhibits good shear-thinning properties and extrusion shape retention, with a total dispersant dosage of only 1~1.2wt%. After direct-write 3D printing and debinding sintering, a density ≥99% and a Vickers hardness >1900HV can be obtained. 30 The complex structure of WC-Co cemented carbide components is suitable for the low-cost preparation of high-performance cemented carbide in industrial applications.

The invention belongs to the technical field of hard alloy additive manufacturing, and discloses a preparation method of high-solid-phase WC-Co water-based slurry for direct writing forming. According to the preparation method, cobalt-coated tungsten carbide powder is used as a solid-phase main body and is dispersed in an ammonium citrate and polyethylene glycol composite additive aqueous solution, and WC-Co water-based slurry with the solid-phase content being 90-93 wt% is prepared. The slurry has the good shear thinning characteristic and extrusion shape preserving capacity, the total dosage of the dispersing agent is only 1-1.2 wt%, after direct-writing 3D printing and degreasing sintering, a WC-Co hard alloy component of a complex structure with the density larger than or equal to 99% and the Vickers hardness larger than 1900 HV30 can be obtained, and the slurry is suitable for low-cost preparation of high-performance hard alloy in the industrial field.

The invention relates to a method for optimizing gelatinization and rheological properties of wheat starch based on addition of modified pectin, and belongs to the technical field of food processing and starch modification. In order to solve the technical problems that existing wheat starch is low in gelatinization temperature and poor in thermal stability, and rheological properties are difficult to accurately regulate and control, the modified pectin with low esterification degree, high molecular weight and high amidation degree is prepared through a specific process, and natural pectin is subjected to low-temperature deesterification and segmented amidation treatment, so that the modified pectin is obtained. Controlling the esterification degree to be lower than 10%, the molecular weight to be greater than 100 kDa and the amidation degree to be higher than 50%, and then forming a three-dimensional composite network structure with wheat starch according to the mass ratio of (1: 4)-(1: 9) through high-speed shearing and ultrasonic synergistic treatment. According to the method, the starch gelatinization temperature is remarkably increased, the thermal stability and shear thinning recovery capacity of a system are improved, the method is suitable for improving the quality of cooked wheaten food products such as noodles and baked products, and the texture characteristics and processing adaptability of the products can be effectively improved.

The application provides a roll gap control method of a double-roller thin strip process and a double-roller thin strip casting device. In the preparation process, relative movement between two rollers is controlled, or relative movement between the two rollers and control of the roll system in the form of overall movement are controlled to move on the double-roller thin strip casting machine, so that the roll gap only produces floating which can play a role in stabilizing the process and / or improving the quality of the blank. Compared with the traditional roll gap two-way floating method, the technical solution of the application does not cause two-way fluctuation of the roll body clamping force, and does not produce fluctuation of the thickness of the blank. The shear thinning behavior of the semi-solid material can be inhibited, so that the peak pressure of the molten pool is weakened, which is beneficial to real-time control, can prevent various process stability problems such as liquid leakage of the side sealing plate, damage of the side sealing plate, strip jamming and strip breaking, and can also prevent various blank quality problems such as cracks and wrinkles.

The present application relates to the technical field of phase change materials, and particularly relates to a cold storage agent for ice bags and a preparation method thereof. The cold storage agent comprises deionized water, propylene glycol and modified sodium carboxymethyl cellulose. The core is that the sodium carboxymethyl cellulose is chemically modified: first, an aldehyde group is introduced by oxidation, then 6-amino-6-deoxy-beta-cyclodextrin pre-coated with 1-adamantane amine and dodecylamine are grafted onto the polymer chain to construct a hierarchical network with stable host-guest nodes and dynamic hydrophobic association. The structure significantly improves the freeze-thaw stability of the cold storage agent, the viscosity retention rate can reach more than 85% after 20 cycles, the water separation rate is less than 3.2%, and the cold storage agent has good shear thinning characteristics and excellent cold storage uniformity, effectively overcoming the problems of easy water separation, viscosity attenuation and uneven cold storage of conventional products.

The present application relates to the technical field of metal pressure processing, and discloses an extrusion method for recycled aluminum alloy profiles for anodic oxidation and electrophoretic spraying, which comprises the following steps: adding strontium and boron into recycled aluminum melt, controlling the mass ratio with iron, forming an interface enrichment layer with shear sensitivity on the surface of the iron-containing impurity phase by using strontium; establishing an ingot axial temperature gradient, and controlling the average equivalent strain rate in the extrusion process to be maintained in the critical rheological interval, and physically activating the interface enrichment layer to produce shear thinning; and implementing online gradient freezing quenching after the profile leaves the die. Through the synergy of the critical strain rate and the interface modification, the present application builds an in-situ lubricating layer between the hard impurity phase and the aluminum matrix, eliminates the microscopic tearing caused by the rheological mismatch, and solves the color difference problem of the recycled aluminum surface treatment.

The invention discloses a preparation method of a fine structure surface RB-SiC friction pair based on throttling expansion self-suction type multiphase jet flow, and aims to solve the technical problems of poor uniformity and easy generation of microcracks in fine machining of an RB-SiC material. According to the method, negative pressure is formed through the throttling expansion effect generated when micron diamond gas jet flows through a Laval nozzle, nano diamond slurry with the shear thinning characteristic is automatically sucked in, and cell type diamond cluster abrasive multiphase jet is formed through online mixing; when the surface of a workpiece is impacted, grinding material clusters are depolymerized, uniform fragile region erosion of the material is achieved through the micron diamond, flexible finishing is conducted by means of ploughing and micro-cutting effects of the nano diamond, and therefore generation of micro cracks is synergistically inhibited. And in combination with a mask plate technology, the preparation of the high-quality fine structure surface is finally realized. Through the synergistic effect of multi-phase jet flow online mixing and cell type grinding materials, the quality of the machined surface is remarkably improved, and the method is suitable for preparing the high-performance RB-SiC friction pair.

This invention relates to the field of agricultural breeding technology and discloses an integrated device for precise sampling and labeling of single wheat breeding materials. The device includes a feeding drive mechanism, a photoacoustic coaxial cutting and in-situ labeling module, a carrier-type collection system, a microfluidic system, and a central control system. The device utilizes high-frequency mechanical vibration to cut plant tissue, combined with cavitation effects to prevent sample contamination from the cutting edge. The cut sample falls into the carrier for sealed encapsulation and digital identification. The module pumps liquid photosensitive resin to the plant wound, and through ultrasonic-induced shear thinning and acoustic flow effects, promotes deep resin penetration. A coaxial ultraviolet beam is then output for in-situ curing, forming a peel-resistant, mechanically interlocked label patch. The main control system extracts the sample identifier, timestamp, and spectral characteristics of quantum dots within the resin, generating an encrypted hash value for persistent storage. This invention achieves high-purity, precise sampling, robust in-situ labeling, and tamper-proof multidimensional data traceability.

The invention discloses a magnetic field-assisted fixed-point polishing device and method for an additive manufacturing fine runner, and the magnetic field-assisted fixed-point polishing device and method are characterized in that a magnetic abrasive flowing through the interior of a workpiece is regulated and controlled through a magnetic field generation device capable of moving and rotating in multiple directions: under the condition of no magnetic field, polishing liquid is driven by high pressure to form a high-shear flow field; uniform cutting of the whole runner is realized through a shear thinning effect; when a specific area needs to be emphatically treated, the permanent magnet is accurately moved and positioned to a target area, magnetic particles can rapidly form a chain structure, liquid is locally solidified, and therefore the shearing force of the liquid is increased, and specific positions such as adhering slag and an under-throwing area of a bent pipe are efficiently and accurately removed; high efficiency and high precision are both considered, flow blockage and thermal runaway risks caused by runner defects can be effectively eliminated, and the reliability and safety of key components in the fields of aerospace, high-energy equipment and the like are remarkably improved.

The invention provides a 3D printing method and a combination of a supporting bath and a 3D printing material.The 3D printing method comprises the following steps that a preset mass of component B of bi-component addition type RTV silica gel is weighed and placed in a mixing container, a preset mass of hydrophobic treatment fumed silica is weighed and added into the mixing container, and the component B and the hydrophobic treatment fumed silica are mixed; fully and uniformly mixing the component B and fumed silica by using a homogenizer; pouring out the uniformly mixed mixture, putting the mixture into a vacuum defoaming machine, and vacuumizing until bubbles are removed, so as to obtain a supporting bath material; the bath supporting material provided by the invention is formed by compounding the component B of the bi-component addition type RTV silica gel and the hydrophobic fumed silica, has high yield stress and good shear thinning characteristics, can effectively support low-viscosity printing ink, and improves the stability and precision of the printing process; meanwhile, the support bath has good flowability, self-repairability and structure recovery capability, and the problems of insufficient support force, printing deformation and the like in the prior art are effectively solved.

The invention discloses TOPCon front silver paste suitable for narrow linewidth. The TOPCon front silver paste is prepared from the following raw materials in percentage by weight: 85-90% of a silver powder composition, 1-3% of a glass powder composition, 5-10% of an organic carrier I, 1-5% of an organic solvent and the balance of additives. The shear thinning characteristic of the front silver paste is improved, the thixotropic index is improved, the silver paste can easily pass through a net, and the height-width ratio is kept after printing. The precision and the uniformity in the silver paste printing process are optimized, and the problems of grid breaking and edge blurring are avoided. And silver powder particles can form compact and narrower silver grid lines, so that the use amount of silver paste is reduced, and the manufacturing cost is reduced. And the EL imaging effect and the cell conversion efficiency are better.

The invention discloses a preparation method of a non-Newtonian fluid-based temperature-shear dual response type ophthalmic sustained-release drug carrier, and belongs to the technical field of ophthalmic medicines. The preparation is composed of a dispersed phase (a temperature response type targeting nano-drug carrier) and a continuous phase (a non-Newtonian fluid matrix), wherein the mass fraction of the dispersed phase in the continuous phase is 0.5-2%. The temperature response type targeted nano-drug carrier is of a core-shell two-layer structure, the core is composed of a PLGA-PEG copolymer and an active drug, the shell is formed by grafting poly N-isopropylacrylamide (PNIPAM) and hyaluronic acid, and the lowest critical solution temperature (LCST) of the PNIPAM is 35-37 DEG C; the non-Newtonian fluid matrix is a pseudoplastic fluid, is composed of Carbomer 940 and triethanolamine, and has a shear thinning characteristic. The preparation method comprises the following three steps: preparation of the temperature response type targeting nano-drug carrier, preparation of the non-Newtonian fluid matrix and low-speed dispersion and compounding of the two. According to the invention, shear-response convenient administration, temperature-response precise drug release and long-acting retention synergism are realized, the bioavailability of the drug and the compliance of a patient are remarkably improved, the stability is excellent, the preparation process is simple and controllable, and the preparation method is suitable for long-acting targeted therapy of chronic eye diseases such as allergic conjunctivitis, chronic xerophthalmia, glaucoma and the like.

The invention provides an egg white-sourced protein-based biological hydrogel as well as a preparation method and application thereof. The method comprises the following steps: separating and purifying ovomucoid in egg white by adopting an ethanol fractional precipitation method, and accurately controlling the final concentration of ethanol in a system in two ethanol precipitation processes, so that the final concentration a of ethanol in the system in the primary ethanol precipitation process and the final concentration b of ethanol in the system in the secondary ethanol precipitation process meet the condition that a is greater than or equal to 40 vol% and less than or equal to 62%; other miscellaneous proteins, salts and other small molecular impurities in the egg white can be removed, and the ovomucoid is efficiently separated and purified from the egg white; the modified ovomucoid obtained by covalently modifying the ovomucoid separated and purified by the method by using a modifier has the rheological characteristics of rapid crosslinking, shear thinning and the like, and can form the protein-based biological hydrogel under the action of a photoinitiator. The rapid prototyping and mechanical properties of the hydrogel are met, and the hydrogel has a wide application prospect in preparation of 3D biological printing materials, 4D biological printing materials, artificial organs, artificial tissues and dressings.

The application discloses a mass flow calibration method and system, comprising: connecting a Coriolis mass flow meter to a calibration bench pipeline, and installing an intelligent sensor containing an ultrasonic Doppler array on the upstream side in the axial direction; starting a liquid supply pump to pump calibration fluid, controlling the ultrasonic Doppler array to perform cross-section scanning on the fluid to obtain dynamic flow profile time series data; inputting the dynamic flow profile time series data into a pre-trained fluid relaxation state prediction machine learning model, outputting a steady state arrival time point from the fluid relaxation state prediction machine learning model; triggering a calibration sampling instruction at the steady state arrival time point, obtaining a sampling mass flow value and comparing it with a reference standard flow value to complete calibration. The application solves the problem of systematic error in calibration sampling caused by non-steady state changes in flow pattern during the shear thinning recovery period of high viscosity fluid.