330 results about "Cellulose nanocrystals" patented technology

The invention is applicable to the technical field of daily cleaning chemicals, and provides a double-shell probiotic microcapsule which comprises probiotics, a fat-soluble plant extract, cellulose nanocrystals, a polyacrylic acid-chitosan compound, a surfactant, diisocyanate, polyethylene glycol and ethyl acetate. A wall material of the microcapsule is formed by compounding a polyacrylic acid-chitosan compound and a fat-soluble plant extract, the particle size D50 is smaller than or equal to 5 microns, the microcapsule is stable in an environment with the pH being 8-10, and the microcapsule is broken to release probiotics when the pH is smaller than or equal to 6. The outer layer is polyacrylic acid / chitosan compound / polyurethane crosslinking (pH response), the inner layer is coconut oil and soybean oil (fat-soluble core), meanwhile, the material preparation process is simple, the controllable degree is high, and the material is suitable for batch preparation.

The invention relates to the technical field of lithium ion batteries, in particular to a diaphragm material for a lithium battery and a preparation method of the diaphragm material. Comprising a base film and a modified nano TiO2 coating, the modified nano TiO2 coating is arranged on at least one side surface of the base film, and the modified nano TiO2 coating comprises the following raw materials in parts by weight: 55-80 parts of a modified nano TiO2 composite material, 8-24 parts of a binder and 2.5-7.5 parts of a dispersant; the modified nano TiO2 composite material is prepared by taking cellulose nanocrystals, lanthanum zirconate and rare earth praseodymium as modifiers and nano TiO2 as a raw material, the mass ratio of the cellulose nanocrystal to the lanthanum zirconate to the rare earth praseodymium is (1-5): (2-3): 1. By adding the modified nano TiO2 composite material and introducing nano particles into the diaphragm, a three-dimensional network structure is formed, the liquid absorption property and the ionic conductivity of the diaphragm are improved, and meanwhile, the diaphragm is high in air permeability and relatively good in mechanical property and ionic conductivity.

The invention relates to a high-strength and high-toughness polylactic acid composite material and a preparation method thereof, and belongs to the technical field of biodegradable high polymer materials. The formula of the polylactic acid composite material comprises the following components in parts by weight: 70-80 parts of polylactic acid, 5-10 parts of modified cellulose nanocrystals, 3-5 parts of modified montmorillonite, 1-2 parts of a plasticizer and 0.5-1.5 parts of an antioxidant. A preparation method of the modified cellulose nanocrystals comprises the following steps: adding cellulose nanocrystals into deionized water, and carrying out ultrasonic treatment to obtain a dispersion liquid A; and sequentially adding 0.5-1 M tannic acid solution at the temperature of 60 DEG C into the dispersion liquid A, cooling to room temperature, dropwise adding 3 M octadecylamine-ethanol solution, washing with ethanol and deionized water, and carrying out step-by-step freeze-drying treatment to obtain the modified cellulose nanocrystal, the polylactic acid composite material prepared by the preparation method has high strength, high toughness and good high temperature resistance.

The invention provides a microbial agent compound fertilizer for sandy land and a preparation method thereof, and relates to the technical field of compound fertilizers. The invention relates to a microbial inoculum compound fertilizer for sandy land. The soil conditioner is prepared from the following raw materials in parts by mass: 40 to 60 parts of compost, 0.3 to 0.8 part of nitrogen-fixing bacteria, 0.3 to 0.8 part of phosphate solubilizing bacteria, 0.3 to 0.8 part of potassium bacteria, 8 to 12 parts of charcoal, 8 to 12 parts of zeolite, 9 to 13 parts of perlite, 4 to 6 parts of vermiculite, 1 to 3 parts of seaweed extract, 2 to 4 parts of humic acid, 1 to 7 parts of waste cellulose nanocrystals, 30 to 40 parts of insect debris, 0.3 to 3 parts of nano carbon dots, 3 to 9 parts of lime and 8 to 15 parts of wood fiber. The compound fertilizer disclosed by the invention not only is rich in various necessary nutrient elements, but also has a good slow release effect and a good soil improvement function, can effectively improve soil fertility and promote plant growth through the action of various biological strains, and also has the characteristics of environmental protection and no pollution by utilizing the waste cellulose nanocrystals and the insect remains.

The present invention relates to the field of plastic films, and in particular to an agricultural plastic film and a preparation method thereof. The agricultural plastic film is composed of the following components in parts by mass: 95-105 parts of film particles, 2-4 parts of modified nano-titanium dioxide emulsion, 6-10 parts of lignin nanoparticles, 2-4 parts of tannic acid, 6-10 parts of glycerol, 4-6 parts of maleic anhydride-grafted polycaprolactone as a co-solvent, and 4-6 parts of cellulose nanocrystals. Compared with the prior art, the present invention achieves comprehensive improvement in material degradability, anti-aging performance and processing efficiency, while taking into account production cost optimization and process adaptability. The agricultural plastic film can be widely used in agricultural scenarios such as greenhouse covering and soil moisture retention, has significant advantages in reducing environmental pollution and improving the comprehensive performance of agricultural films, and has broad application prospects.

The invention provides a stabilizer for Pickering emulsion and application of the stabilizer, and relates to the technical field of Pickering emulsion preparation. The stabilizing agent for the Pickering emulsion is obtained by compounding 6 '-O-caffeoyl arbutin and cellulose nanocrystals. In specific application, the 6'-O-caffeoyl arbutin and the cellulose nanocrystals are prepared into a water phase, and then the water phase is mixed with an oil phase to prepare the Pickering emulsion. According to the preparation method, the defects in the prior art are overcome, the stability of the Pickering emulsion is effectively improved, meanwhile, the oxidation resistance effect of the Pickering emulsion is further enhanced, and the application value of the Pickering emulsion is improved.

The invention belongs to the technical field of self-repairing materials, and particularly relates to a double-microcapsule self-repairing waterborne polyurethane material and a preparation method thereof. Comprising the following steps: ultrasonically dispersing cellulose nanocrystals in deionized water to form a water phase, adding drying oil and lauryl sodium sulfate, and stirring to obtain the drying oil microcapsule taking Pickering emulsion as a template. Preparing a polyvinylpyrrolidone aqueous solution, a non-polar solvent solution of thiophene monomers and an ammonium persulfate aqueous solution; and mixing and ultrasonically dispersing the two, mixing with an ammonium persulfate aqueous solution, stirring and polymerizing to obtain a polythiophene microcapsule suspension after the reaction is completed, centrifuging until the supernatant is colorless, and washing and drying the solid to obtain the polythiophene microcapsule. And finally, adding the two microcapsules into waterborne polyurethane, uniformly mixing, and drying at room temperature to form the double-microcapsule self-repairing waterborne polyurethane material. According to the invention, the self-repairing and mechanical property improvement of the double-microcapsule self-repairing waterborne polyurethane material under room-temperature natural light are realized.

A method of adsorbing a dye from an aqueous solution including contacting a composition with the aqueous solution. At least a portion of the dye adsorbs to the composition. The composition includes biochar, cellulose nanocrystals, and a layered double hydroxide (LDH). The LDH includes Cu and Fe. Particles of the LDH and the biochar at least partially cover an outer surface of the cellulose nanocrystals.

The invention discloses a hydrogel-based helicobacter pylori killing medicine and a preparation method thereof in the technical field of biomedical materials, and the hydrogel medicine adopts a shell-core layered structure and comprises an outer layer and an inner layer; the outer layer is a high-density cross-linked polyethylene glycol diacrylate network, and cellulose nanocrystals modified by silane are dispersed in the polyethylene glycol diacrylate network; pH-sensitive Schiff base bonds and / or boric acid ester bonds are embedded in the inner layer, and an antibacterial agent is loaded on the inner layer. Structural expansion and breaking of the hydrogel are controlled through a multi-layer structure, multiple loaded antibacterial agents are released according to pH response, the influence of drug resistance is avoided through sterilization of multiple mechanisms, the preparation process and device of the hydrogel drug are integrated, the production cost is reduced, and the clinical conversion efficiency is guaranteed.

The invention relates to the technical field of conductive materials, and discloses a flexible conductive composite material and a preparation method and application thereof. The flexible conductive composite material comprises the following preparation raw materials: a thermoplastic elastomer, a conductive filler, cellulose nanocrystals, an inorganic salt, an organic solvent and water. According to the flexible conductive composite material provided by the invention, the Pickering emulsion is co-stabilized by the cellulose nanocrystal auxiliary conductive filler, the cellulose nanocrystal raw material is easy to obtain, biodegradable, environment-friendly and pollution-free, the Pickering emulsion is good in stability, the conductive filler is directionally enriched on an emulsion interface to form a continuous path, the bottleneck of filler dispersion is broken through, a conductive network structure is complete, and the stability of the Pickering emulsion is improved. The strain sensing response is sensitive, reversible circulation is achieved, the conductive interval is wide, the conductive seepage threshold value is about 1 wt%-2 wt%, when the addition amount of the conductive filler is 10 wt%, the conductivity is about 25 S / cm, and the conductivity is improved in a breakthrough mode.

The invention provides a polycarbonate box dam material, a preparation method and application, and the polycarbonate box dam material is prepared from the following raw materials in parts by weight: 65 to 72 parts of polycarbonate, 4 to 5 parts of methyl methacrylate-butadiene-styrene terpolymer, 18 to 22 parts of titanium dioxide, 2 to 4 parts of cellulose nanocrystal, 0.1 to 0.3 part of antioxidant and 0.1 to 0.3 part of anti-ultraviolet agent. The flame-retardant plastic is prepared from the following components in parts by weight: 0.8-1.2 parts of a silane coupling agent, 0.3-0.5 part of a plasticizer, 0.6-0.8 part of a lubricant, 0.09-0.11 part of an anti-dripping agent and 0.25-0.35 part of a flame retardant. The polycarbonate box dam material is good in adhesion performance, adhesion of the box dam material can be completed within a short time, the next production process can be rapidly started, the production efficiency is improved, and the problem that the box dam material is low in production efficiency is solved.

The invention provides core-shell structure reinforced white carbon black / graphene oxide hybridized glass-lined porcelain glaze and a preparation method thereof. The porcelain glaze is composed of a basic glaze material and a core-shell structure hybrid reinforcement phase dispersed in the basic glaze material, the reinforcement phase takes white carbon black as a core and zirconium oxide as a shell, and a three-dimensional hybrid network formed by KH-560 grafted cellulose nanocrystals or carbon nanotubes and graphene oxide is constructed between the core and the shell. The preparation method mainly comprises the following steps: carrying out pre-dispersion and in-situ hybridization on the white carbon black, the graphene oxide and the one-dimensional nanofibers through a silane coupling agent; constructing a three-dimensional network under a catalytic condition by using a sol-gel method; a stable core-shell structure is formed through a deposition reaction of zirconium sol; finally, the obtained composite slurry is compounded with basic glaze with specific components, rapid densification is achieved through microwave sintering, and the product is particularly suitable for chemical reaction kettle glass lining with strict requirements for corrosion resistance and impact resistance.

The invention belongs to the technical field of fruit freeze-drying processing, and particularly relates to a comprehensive fruit freeze-drying processing method capable of reducing nutrient loss of fruits, which comprises the following steps: S1, immersing sliced fruit slices into a composite color fixative, and simultaneously applying ultrasonic and pulsed electric field treatment on the composite color fixative system containing the fruit slices under the conditions that the ultrasonic power is 200-300W, the pulsed electric field intensity is 15-25kV / cm, and the ultrasonic power is 200-300W and the pulsed electric field intensity is 15-25kV / cm; the co-processing time is 2-4 minutes, so as to obtain the color-protected and strengthened fruit slices; s2, sequentially carrying out three-stage magnetic field freezing treatment on the color-protected and strengthened fruit slices to obtain frozen fruit slices; s3, dynamically adjusting parameters of the frozen fruit slices by adopting an AI algorithm, and performing vacuum freeze-drying in stages to obtain primary freeze-dried fruit slices; s4, placing the primary freeze-dried fruit slices in a vacuum environment to obtain deeply dried fruit slices; and S5, soaking the deeply dried fruit slices in an aqueous solution containing 0.5-1% of amyloid-like protein, 0.2-0.4% of sodium alginate and 0.1-0.3% of cellulose nanocrystals for 1-2 minutes to form a composite protective film with the thickness of 1-3 microns, so as to obtain the coated fruit slices.

The invention relates to the technical field of metal surface modification, in particular to a magnesium alloy anticorrosive coating and a preparation method and application thereof. The method comprises the following steps: firstly, performing micro-arc oxidation treatment on magnesium alloy to form a substrate layer; then, the micro-arc oxidation coating is subjected to hole sealing treatment through dendritic mesoporous silica loaded with a corrosion inhibitor, and the self-repairing function is given to the micro-arc oxidation coating; then, a layered self-similar coating composed of dendritic mesoporous silica loaded with a corrosion inhibitor and a resin matrix is constructed on the surface of the hole sealing layer, and interface bonding and compactness are enhanced; finally, dendritic mesoporous silica, cellulose nanocrystals, 1H, 1H, 2H, 2H-perfluorodecyl triethoxy silane, organic resin and tetraethoxy silane are introduced, and the super-hydrophobic coating with a micro-nano composite firm structure is formed on the surface layer. The obtained magnesium alloy anti-corrosion coating integrates the characteristics of long-acting corrosion resistance, super-hydrophobicity, self-repairing, high mechanical stability and the like, and the technical problems that a traditional magnesium alloy anti-corrosion coating is prone to physical or chemical damage and insufficient in durability are effectively solved.

The invention discloses a humidity response discoloration radiation refrigeration material which comprises a scattering layer and an iridescent photon film arranged on the surface of the scattering layer, the iridescent photon film is a cellulose nanocrystal / polyethylene glycol composite film, and the scattering layer is a polylactic acid-silicon dioxide-aluminum oxide composite nanofiber film. Through the composite design of the top cellulose nanocrystal / polyethylene glycol iridescent photon film and the bottom PLA / SiO2 / Al2O3 scattering layer, coupling of color mirror reflection of the color radiation refrigeration function layer constructed by CNC / PEG composite and broadband diffusion response of the electrostatic spinning film reflecting layer is achieved, and the negative effects of moisture absorption and color development on the reflectivity are reduced; color intelligent response and efficient radiation refrigeration are successfully combined; the preparation method is simple in process, the adopted raw materials are all degradable and renewable materials, the cost is low, and industrial popularization and application are easy.

The invention provides a colored radiation refrigeration coating as well as a preparation method and application thereof, and belongs to the technical field of building materials. The preparation method comprises the following steps: carrying out self-assembly on a sulfonated cellulose nanocrystal aqueous solution to obtain a colored film; sequentially carrying out heat treatment and crushing on the colored film to obtain structural color particles; mixing the structural color particles with resin to obtain a mixture; and coating a reflecting layer with the mixture to obtain the colored radiation refrigeration coating. According to the colored radiation refrigeration coating and the preparation method thereof, the sulfonated cellulose nanocrystals form an expandable colored coating in a manner of crushing and mixing with resin, so that the problem of brittleness of the cellulose nanocrystals in use is solved, and the obtained colored radiation refrigeration coating can reduce the refrigeration energy consumption in a building use process in summer. The reflectivity of the prepared colored radiation refrigeration coating is 90-93%, the emissivity of the prepared colored radiation refrigeration coating is 87-92%, and a radiation refrigeration effect can be achieved.

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a carbon-coated aluminum foil coating and a preparation method thereof. The invention aims to solve the problem of contradiction between high conductivity and strong adhesive force of the current carbon-coated aluminum foil coating. According to the invention, a multi-stage dimensional composite conductive network is taken as a design core, and the conductive performance of the coating is improved through a ternary composite system formed by conductive carbon black, one-dimensional carboxylated multi-walled carbon nanotubes and two-dimensional sulfonated graphene oxide; the binder adopts a bio-based water-based system and is formed by compounding carboxylated cellulose nanocrystals and quaternized chitosan, and a compact and tough bonding network layer is formed through electrostatic interaction and hydrogen bond combination; the conductive adhesive is excellent in conductivity and strong in adhesive force, the preparation process is environment-friendly and efficient, and the contradictory problem that the conductivity and the adhesive force are difficult to consider at the same time in the prior art is solved.

The invention relates to a biodegradable polyurethane material as well as a preparation method and application thereof. The biodegradable polyurethane material comprises biodegradable polyurethane and a cellulose nanocrystal graft, wherein the cellulose nanocrystal graft is obtained by carrying out grafting treatment on cellulose nanocrystal after hydrophobic modification, and the addition amount of the cellulose nanocrystal graft is 0.1-10 wt% of that of the biodegradable polyurethane. Hydrophobic modification and grafting treatment are carried out on the cellulose nanocrystals, so that adsorption of water vapor on the surface layer of polyurethane is reduced, permeation of the water vapor is hindered, and the situation that the mechanical performance is reduced or fails due to degradation after the polyurethane meets water is avoided.

The application belongs to the technical field of self-repairing materials, and particularly relates to a kind of double-microcapsule self-repairing water-based polyurethane material and its preparation method. It comprises: ultrasonic dispersion of cellulose nanocrystals in deionized water to form an aqueous phase, adding dry oil and sodium dodecyl sulfate, and stirring to obtain a dry oil microcapsule with a Pickering emulsion as a template. Then, polyvinylpyrrolidone aqueous solution, non-polar solvent solution of thiophene monomer and ammonium persulfate aqueous solution are prepared. The first two are mixed and ultrasonically dispersed, then mixed with the ammonium persulfate aqueous solution and stirred to polymerize. After the reaction is completed, polythiophene microcapsule suspension is obtained. After centrifugation, the supernatant is colorless. The solid is washed and dried to obtain polythiophene microcapsules. Finally, the two kinds of microcapsules are added to the water-based polyurethane, mixed uniformly, dried at room temperature to form a double-microcapsule self-repairing water-based polyurethane material. The application realizes the self-repairing and mechanical property improvement of the double-microcapsule self-repairing water-based polyurethane material under room temperature natural light.

The invention relates to the technical field of adsorption materials, in particular to a high-performance seaweed carbon fiber material based on microsphere phase change and a preparation method of the high-performance seaweed carbon fiber material. The method comprises the following steps: carrying out component separation on a seaweed raw material to construct a core-shell structure microsphere phase change unit which takes calcium alginate microspheres as a shell and seaweed active polysaccharide as a phase change medium, introducing sulfonic cellulose nanocrystals and polyacrylonitrile to be blended to prepare a composite spinning solution, dispersing the microsphere phase change unit into the composite spinning solution, and preparing the composite spinning solution. After electrostatic spinning, catalytic carbonization and water vapor activation, the seaweed carbon fiber material is finally prepared, a sulfonic acid group effectively catalyzes a polyacrylonitrile cyclization reaction in the carbonization process, the compactness of a carbon skeleton is remarkably enhanced, and the sulfonic acid group and a microsphere phase change unit generate a multi-stage synergistic enhancement effect, so that the material has ultrahigh strength and high adsorbability at the same time; the technical problem that the mechanical property and the adsorption property of the biomass carbon fiber are difficult to consider at the same time is solved.

The invention discloses a PC (polycarbonate) composition and a preparation method and application thereof, and belongs to the technical field of high polymer materials, the composition is compounded by introducing cellulose nanocrystals and sulfone polymers into PC resin, so that the chemical resistance of a product can be effectively improved, the product can still maintain stability after being in contact with various organic components, and the stability of the product is improved. Meanwhile, the high and low temperature resistance is remarkably improved, the toughness retention rate of the product at low temperature is high, the thermal deformation temperature is high, and the comprehensive performance is excellent.

The application discloses a polyester synthesis method and application thereof. The polyester synthesis method comprises the following steps: preparing a sol containing cellulose nanocrystals, and an alcohol solution containing an aluminum alkoxide; adding the alcohol solution into the sol to react; separating a solid phase to obtain a composite catalyst; and synthesizing polyester under the co-catalysis of the composite catalyst and diisopropyl bis(acetylacetonyl) titanate. The polyester synthesized by the method has low carboxyl content, high light transmittance, high mechanical property and hydrolysis resistance, and can be used for preparing a polyester film. The application also provides application of the polyester prepared by the method.

The invention belongs to the technical field of lithium ion battery preparation, and particularly relates to a multifunctional composite adhesive for a lithium-rich manganese-based positive electrode and a preparation method and application thereof. The multifunctional composite adhesive is obtained by dissolving cellulose nanocrystals (CNC) and sodium carboxymethyl cellulose (CMC) in deionized water and then stirring and cross-linking. According to the lithium-rich manganese-based positive electrode material, the bonding and mechanical properties can be effectively improved, the conductivity of a lithium-rich manganese-based positive electrode can be enhanced, reaction kinetics can be accelerated, a transmission path can be optimized, the charge-discharge cycle stability, rate capability and the like of the battery can be greatly improved, and the battery with stable capacity and long cycle life can be obtained; and within the voltage of 2-4.8 V, the capacity retention ratio is 103.36% after 50 cycles under the current of 0.1 C, the capacity retention ratio is 90.47% after 400 cycles under the current of 1C, and the specific discharge capacity can reach 161.98 mAh / g under the current of 5C. In addition, the composite binder disclosed by the invention is simple in composition, simple in preparation process, easy in raw material acquisition, low in cost, non-toxic and safe, greatly reduces the production difficulty, and is suitable for large-scale industrial production.

The invention provides a left-handed torsion type II cellulose nanocrystal and right-handed chiral photon self-supporting transparent film as well as a preparation method and application thereof, and belongs to the technical field of nano materials. The method comprises the following steps: mixing type II cellulose with sulfuric acid, and carrying out hydrolysis reaction to obtain type II cellulose nanocrystals; the concentration of the sulfuric acid is greater than or equal to 60wt%; the type II cellulose nanocrystals are subjected to desulfurization treatment, the levorotation torsion type II cellulose nanocrystals are obtained, and the sulfur content in the levorotation torsion type II cellulose nanocrystals ranges from 0.450 wt% to 0.900 wt%. The torsional chiral amplification of the type II cellulose nanocrystal is realized through desulfurization treatment, and the obtained left-handed torsional type II cellulose nanocrystal has a rodlike left-handed torsional morphology, and has relatively strong capability of forming chiral nematic liquid crystal through evaporation-induced self-assembly; the right-handed chiral photon self-supporting transparent film can be formed by evaporation-induced self-assembly of the left-handed torsion type II cellulose nanocrystal.

The application discloses an anti-inflammatory easily-replaced adhesive hydrogel adhesive plaster and a preparation method thereof, relates to the field of biomedical materials, and is a green-prepared hydrogel adhesive plaster based on lipoic acid / hyaluronic acid-g-lipoic acid / cellulose nanocrystals, which has excellent adhesion, tensile property and reusability, and has the abilities of anti-inflammation and promoting wound repair, and can be easily removed through water washing, has the function of being removed on demand, and can be applied to the treatment and healing of first-aid trauma wounds.

The invention discloses a composite foaming agent, rigid polyurethane foam, a preparation method and application, and belongs to the technical field of rigid polyurethane materials. According to the technical scheme, the foaming agent comprises a first physical foaming agent, a second physical foaming agent, a chemical foaming agent and silanized cellulose nanocrystals, the first physical foaming agent is cyclopentane, the second physical foaming agent is a low-boiling-point foaming agent, and the chemical foaming agent comprises an organic amine salt compound. The foaming agent is applied to thermal insulation materials, and the problem that an existing foaming agent system cannot give consideration to heat conduction and foam strength well is solved.

This invention relates to a high-strength, high-toughness polylactic acid (PLA) composite material and its preparation method, belonging to the field of biodegradable polymer materials technology. The PLA composite material formulation is as follows: by weight, 70-80 parts PLA, 5-10 parts modified cellulose nanocrystals, 3-5 parts modified montmorillonite, 1-2 parts plasticizer, and 0.5-1.5 parts antioxidant. The preparation method of the modified cellulose nanocrystals is as follows: cellulose nanocrystals are added to deionized water and ultrasonically treated to obtain dispersion A; a 0.5-1 M tannic acid solution at 60°C is added sequentially to dispersion A; after cooling to room temperature, a 3 M octadecylamine-ethanol solution is added dropwise; the mixture is washed with ethanol and deionized water, and then subjected to stepwise freeze-drying to obtain the modified cellulose nanocrystals. The PLA composite material prepared by the method of this invention exhibits high strength, high toughness, and good high-temperature resistance.

The invention provides a conversion method of rare ginsenoside Rg5. According to the method, through a vacuum permeation technology, gas in cell gaps of ginseng roots is removed in a vacuum environment, a permeation barrier of cell walls is weakened, a micro-channel is formed, and then a mixed solution of methanol and n-butyl alcohol is injected for primary extraction; after the normal pressure is recovered, the mixed solution can be driven by differential pressure to quickly fill a micro-channel and be better dissolved with the ginseng roots, a more efficient extraction environment is created, extraction is carried out under the low-temperature condition of 30-50 DEG C, thermal degradation of PPD can be effectively avoided, meanwhile, dissolution of impurities such as polysaccharide and protein is reduced, and the adverse effect of the impurities on subsequent conversion is reduced; finally, cellulose nanocrystals and a hydrochloric acid solution are added, on the basis that extraction is further promoted, protopanoxadiol saponin can be efficiently and directionally converted into rare ginsenoside Rg5, meanwhile, generation of an isomeride Rk1 of the rare ginsenoside Rg5 is reduced, and then the yield and purity of the Rg5 are remarkably improved.

This invention discloses a porous carbon-based dual-drug-loaded nanomaterial for sustained release. The material uses a thermosensitive polymer as a matrix and cellulose nanocrystals modified with cationic surfactants as a reinforcing phase, loading both hydrophilic and hydrophobic drugs. This material can be used to prepare therapeutic drugs for gynecological diseases and infertility, as well as drug delivery devices. Furthermore, this invention provides a uterine scaffold prepared using this material, which can be fabricated using 3D printing technology. Utilizing the PNIPAm hydrogel network and its temperature-responsive properties, hydrophilic drugs can be loaded at low temperatures. The high mechanical strength of CNC machining allows for the loading of hydrophobic drugs while improving the mechanical properties of the hydrogel matrix, thus solving the problems of easy detachment and bleeding in existing technologies.

The invention provides a deleading agent FT236 and a preparation method and application thereof, the deleading agent FT236 is prepared by taking cellulose nanocrystals CNC as a matrix, diethylenetriamine pentaacetic acid DTPA as a collecting agent, gamma-mercaptopropyltrimethoxysilane MPTMS as a cross-linking agent and chitosan quaternary ammonium salt HTCC as a flocculating agent through the steps of main reaction and post-treatment. The nano structure of the CNC substrate can uniformly load DTPA and MPTMS to provide a stable framework; a collecting agent DTPA is extremely high in chelating capacity for lead ions and is not combined with silver ions, and loss of precious metal is avoided; mPTMS can strengthen the structural stability of the medicament; the HTCC has flocculation activity and can promote agglomeration of the nanoparticles.