325 results about "Natural polymers" patented technology

The invention provides an intelligent antibacterial konjac glucomannan composite film and a preparation method thereof. The intelligent antibacterial konjac glucomannan composite film is prepared by carrying out graft copolymerization on oxidized konjac glucomannan OKGM and amino-functionalized poly (N-isopropylacrylamide) PNIPAM-NH2 and then crosslinking with an antibacterial agent, the tail end of a molecular chain of the amino-functionalized poly (N-isopropylacrylamide) is provided with an amino group. The intelligent antibacterial konjac glucomannan composite film disclosed by the invention has temperature responsiveness, can control the release of an antibacterial agent according to environmental changes, ensures that the antibacterial agent is accurately released as required, and effectively prolongs the food preservation time and the food shelf life. The film is good in biocompatibility, has no obvious toxic reaction on human tissues and cells, and provides possibility for application in the field of biomedicine. Besides, the film has degradability, and the OKGM and the chitosan are natural high polymer materials and can be decomposed into harmless substances by microorganisms in the natural environment, so that the film meets the requirements of environmental protection and is beneficial to reducing environmental pollution.

The invention relates to the technical field of polymer composite materials, and discloses a refining treatment method of a bamboo fiber ultra-nano micro powder and natural polymer blended material, which comprises the following steps: (a) premixing bamboo fiber ultra-nano micro powder and a deep eutectic solvent to obtain a premix and realize in-situ activation; (b) adding the premix and a natural polymer matrix from a main feed port of a double-screw extruder; and (c) in the melt blending process, adding a dynamic interface locking agent through a side feeding port arranged at the downstream of the main feeding port, and then extruding and granulating. A staged dynamic compatibilization process is adopted, a hydrogen bond network of bamboo fibers is destroyed by using a deep eutectic solvent to promote shearing dispersion of the bamboo fibers in the front section, and stable interface bonding is constructed in the rear section through a dynamic interface locking agent after dispersion is completed. The method synergistically solves the conflict between dispersion and interfacial compatibilization, so that the composite material has good comprehensive performance.

The invention relates to a cellulose-chitosan-based lithium ion battery diaphragm and a preparation method and application thereof.The preparation method of the diaphragm comprises the steps that gamma-polyglutamic acid and polyamide epichlorohydrin are adopted for modifying chitosan, the hydrophilicity and the liquid absorption capacity of the chitosan are improved, polyvinylpyrrolidone is adopted for coating the chitosan, and the hydrophilicity and the liquid absorption capacity of the chitosan are improved; pVP is replaced in ethanol soaking to form micropores, so that the porosity of the modified chitosan is improved. Amino groups and hydroxyl groups of the modified chitosan are combined with catechol of the polydopamine and hydroxyl groups of the hydroxy propyl cellulose through hydrogen bonds and covalent bonds to form a chitosan-cellulose-PDA interpenetrating network, and the diaphragm material suitable for the lithium ion battery is finally prepared by combining hot-pressing shaping. The preparation method has the advantages that the balance between the mechanical property and the ion conduction property of the diaphragm is realized through multi-component compounding by utilizing the biocompatibility and renewability of natural macromolecules (cellulose and chitosan).

Disclosed in the present invention are a gel having a regulatable free water content and morphology, a preparation method therefor, and the use thereof. The method comprises: S1, preparing a solution A from a natural polymer material; S2, mixing a small molecule material containing a positively charged polar group with the solution A to obtain a composite solution B; S3, mixing the composite solution B with a regulator to obtain a composite solution C, stirring same, then adding a condensing agent to the reaction system, and carrying out a curing crosslinking reaction; and S4, removing the regulator and the condensing agent to obtain the gel. By adjusting the concentrations of the natural polymer material and the regulator, gels having different morphologies can be prepared; the gel undergoes a physical process to remove hydrogen bond interaction between the gel and free water, so that the content of free water attached to the surface of the gel can be regulated, thereby regulating the physical and chemical properties of the gel. The gel of the present invention has regulatable morphology and controllable elastic modulus, and has many advantages such as good lubrication effect, good biocompatibility and biodegradability, capability of being biologically active, and capabilities of stimulating cell growth and accelerating wound repair.

The invention provides a method for preparing vaterite type nanoscale calcium carbonate with ardealite as a raw material and application of the method, and relates to the technical field of inorganic nano-material preparation.The method comprises the following steps that firstly, efficient dissociation of calcium ions in the ardealite is achieved through a phase transfer method, then digestion treatment is conducted on a leaching solution, and the leaching solution is obtained; a crystal morphology regulating agent is further introduced to construct a mineralized microenvironment, and then through a carbon dioxide carbonization reaction, vaterite type nano-scale calcium carbonate with a specific average particle size (200-400 nm) is prepared. According to the preparation method, natural high polymer materials such as collagen are introduced in the preparation process to serve as green crystal form guiding agents, so that the coordination effect of the natural high polymer materials and calcium ions can be utilized, the crystal morphology can be effectively regulated and controlled, and the biocompatibility of the nano material is improved; and the application possibility of calcium carbonate in the biomedical fields of drug carriers, bone repair materials and the like is expanded.

The invention relates to the technical field of water treatment, and discloses a silicon powder conditioner and a preparation method thereof, the silicon powder conditioner comprises 20-40% of an inorganic coagulant, 5-15% of an organic polymer coagulant, 3-10% of a natural polymer coagulant aid, 10-25% of a demulsifier, 2-8% of a synthetic coagulant aid, and the balance of water. The demulsifying agent is compounded with various coagulants and coagulant aids, the demulsifying agent preferentially destroys an oil-water interfacial film, releases wrapped silicon powder and eliminates the'colloid protection 'effect of oil stains on the surface of the silicon powder, and the inorganic and organic coagulants rapidly perform electrical neutralization and adsorption bridging on exposed silicon powder particles to form floc which is good in settling performance and easy to filter. Meanwhile, the inorganic coagulant provides positive charges and efficiently neutralizes the microfine silicon powder with negative charges; cPAM with high molecular weight and PDADMAC with strong cations form long-chain bridging and patching effects, so that fine particles with the particle size of 1-5 microns are specially captured, and meanwhile, larger-particle silicon powder is improved to form floc which is easy to filter; the natural polymer further increases the volume and density of the floc, and prevents the floc from being broken under shearing.

The invention discloses a protective coating treating agent, a protective coating treating fluid, modified forage and a preparation method and application thereof, and belongs to the technical field of ecological engineering. The protective coating treating agent comprises a first component, a second component and a third component in a mass ratio of 10: (0.5-2.5): (1-3), the first component is a natural polymer film-forming material; the second component is a plant-derived functional anti-degradation agent; and the third component is a natural mineral particle reinforcing agent. The protective coating treating agent containing the components is prepared into a protective coating treating fluid, and then the protective coating treating fluid is coated on the surface of forage to form a protective coating, so that the aging resistance of the straw checks in environments of high temperature, strong ultraviolet rays, sand erosion and microbial erosion can be remarkably improved, the service life of the straw checks is prolonged, and the service life of the straw checks is prolonged. And the operation and maintenance cost of ecological restoration engineering is reduced. The straw checkerboard with the protective coating can be widely applied to ecological engineering construction such as treatment of railways, highways and sand source areas in arid and windy sand areas.

The invention discloses injectable oxygen-carrying and medicine-carrying microbubble composite hydrogel with immunoregulation performance and a preparation method of the injectable oxygen-carrying and medicine-carrying microbubble composite hydrogel, and belongs to the field of tissue damage treatment. The preparation method comprises the following steps: carrying out a reaction on hyaluronic acid HA and dipalmitoyl phosphatidyl ethanolamine DPPE to construct a microbubble monomer DPPE-HA; the preparation method comprises the following steps: fully dissolving DPPC (dipalmitoyl phosphatidylcholine), DPPE-HA (dipalmitoyl phosphatidylcholine) and a therapeutic drug into a solvent, introducing oxygen and carrying out mechanical oscillation to obtain oxygen-carrying and drug-carrying microbubbles; the oxygen-carrying and drug-carrying microbubbles are uniformly doped into a vinyl modified natural polymer solution, and the oxygen-carrying and drug-carrying microbubble composite hydrogel is formed through photo-crosslinking. The obtained injectable microbubble hydrogel can be used for treatment of different tissue injuries, including wound repair and burn treatment, osteochondral injury repair, cardiovascular disease treatment and nerve injury repair, in addition, the injectable microbubble hydrogel can also be applied to the fields of cosmetic plastic surgery, skin regeneration and the like, and has a wide clinical application prospect.

The invention belongs to the technical field of vaccine adjuvants, and particularly relates to a water-in-oil-in-water adjuvant, a veterinary vaccine and a preparation method thereof.The water-in-oil-in-water adjuvant is prepared from, by weight, 0.5%-7.5% of a hydrophilic composite surfactant, 0.6%-9.8% of an oleophylic composite surfactant, 70%-85% of mineral oil and the balance water; and the mineral oil also comprises the following components in concentration: a reinforcing agent of 0.45-0.9 g / ml and a stabilizing agent of 2-6.9 g / L, wherein the water-in-oil-in-water adjuvant forms a gelatinous structure under the regulation of the stabilizer and is a non-Newtonian fluid of which the viscosity is not higher than 25cp; the adjuvant shows the non-flowing fluid characteristic through the stabilizer, the rheological property of the produced vaccine is enhanced, the stability of the vaccine is improved, on the premise that the hydrophilic surfactant and the oleophylic surfactant are balanced, the natural polymer enhancer is added, and on the premise that the adjuvant viscosity is reduced and granuloma side reaction is not prone to being generated, the stability of the vaccine is improved. Short-term immunity and long-term immunity can be induced at the same time, and the application of the water-in-oil-in-water adjuvant in the field of veterinary vaccines is expanded.

The invention discloses a method for in-situ rapid growth of a dual-network hydrogel coating on the surface of a base material by a one-step method, which comprises the following steps: putting the base material with an adhesion initiation layer on the surface into a hydrogel precursor solution, and carrying out in-situ polymerization for 0.1-10 minutes under light irradiation, wherein the adhesion initiation layer comprises an adhesive compound based on a catechol group and a first photoinitiator, and the hydrogel precursor solution comprises a natural polymer containing tyrosine, an acrylic monomer, a cross-linking agent and a second photoinitiator, and wherein the first photoinitiator and the second photoinitiator are different from each other and are independently selected from a divalent ruthenium compound and a persulfate. Compared with the prior art, the natural / synthetic polymer double-network gel coating with biological activity and mechanical property can grow on the surfaces of different substrates more quickly and efficiently through a one-step method; and the base material, the surface of which is modified by the in-situ grown double-network hydrogel coating, obtained by the method can be applied to in-vivo medical apparatuses and instruments.

The invention discloses a soil-improving growth-promoting modified lignin soil conditioner and a preparation method thereof, and belongs to the technical field of high polymer materials and soil improvement. The modified lignin soil conditioner comprises an agent A, an agent B and an agent C, the agent A is a cationic modified lignin polymer and is prepared by graft copolymerization of lignosulfonate and a cationic monomer in a free radical initiation mode; the agent B is lignin controlled-release particles and is prepared by wrapping an amino acid amphoteric regulator in the cationic modified lignin polymer and another negative charge natural polymer through electrostatic intercalation self-assembly; the agent C is at least one of citric acid, lactic acid, itaconic acid, fulvic acid, wood vinegar, maleic acid, maleic anhydride and polyacrylic acid. The soil conditioner disclosed by the invention has the advantages of low cost, environment friendliness and efficient repairing performance, and an innovative solution is provided for agricultural soil improvement.

The invention belongs to the technical field of biomedical materials, and discloses a conductive composite scaffold of a bionic nerve orientation structure and a preparation method of the conductive composite scaffold of the bionic nerve orientation structure, and the conductive composite scaffold of the bionic orientation structure is formed by compounding a structural layer and a functional layer, the structural layer is an oriented nanofiber membrane (made of a natural high-molecular polymer containing amino and a synthetic high-molecular polymer), the functional layer is ionic conductive hydrogel (made of a natural high-molecular polymer containing amino and a natural high-molecular polymer containing carboxyl), and the structural layer and the functional layer are compounded through the action of an amido bond; the amido bond is formed by reacting amino of the oriented nanofiber membrane with carboxyl of the ionic conductive hydrogel under an acidic condition; the preparation method comprises the following steps: compounding the structural layer and the functional layer by using glacial acetic acid by adopting a chemical cross-linking method to prepare the conductive composite nerve scaffold with the bionic orientation structure. According to the invention, electric signal transmission between cells can be realized, and the efficiency of damaged nervous tissue repair is improved.

The invention discloses amphiphilic phosphorus-loaded biomass gel and a preparation method and application thereof, and the preparation method comprises the following steps: dissolving a hydrophilic natural polymer material in a solvent to form a uniformly dispersed biomass gel emulsion; activating the biomass gel emulsion by an activating agent A and an activating agent B to obtain pre-activated biomass gel emulsion; dissolving a long-chain alkyl material in water to form a uniformly dispersed emulsion, and uniformly mixing the uniformly dispersed emulsion with the pre-activated biomass gel to obtain a modified biomass gel emulsion; adding a phosphorus-containing solvent and a pore-foaming agent, and mixing to form a porous gel emulsion; after the porous gel emulsion and the biomass gel emulsion are fully mixed, a cross-linking agent is added for a cross-linking reaction. The gel obtained by the invention has an amphiphilic structure of a hydrophobic microcell and a phosphorus-containing hydrophilic group, can play a synergistic effect of electrostatic attraction and hydrophobic repulsion, and realizes selective separation and recovery of rare earth elements in water; the preparation method is simple, raw materials are green, and the method is suitable for large-scale production and has good application prospects.

The invention relates to an in-situ copolymerized and hybridized flocculant and a preparation method and an application method thereof, the in-situ copolymerized and hybridized flocculant comprises an inorganic metal, an organic monomer and a composite natural polymer material package, and the flocculant is formed by segmented in-situ polymerization of the inorganic metal, the organic monomer and the composite natural polymer material package, the inorganic metal is treated metal solid waste leachate; according to the preparation method, a segmented in-situ path of first induced polymerization and then skeleton hybridization is adopted; the application method adopts a one-step conditioning mode. Solid waste leachate is used as a reaction medium, an NVCL monomer is dissolved and polymerized to form an active long chain, then a natural polymer material bag is introduced to realize deep hybridization of space connection and chemical crosslinking, and the floc strength and filter pressing dehydration property in sludge flocculation treatment are improved through a synergistic mechanism. Rapid flocculation and deep dehydration under different mud properties are realized, and the green and environment-friendly properties are improved.

The present invention provides a natural polymer-based food packaging material, a preparation method, and an application thereof, belonging to the technical field of food packaging materials. The present invention uses a chitosan derivative, chitosan quaternary ammonium salt, as a basis and uses the anions of docusate sodium to perform ion exchange on the chitosan quaternary ammonium salt. On the one hand, the chitosan quaternary ammonium salt takes advantage of its antibacterial and film-forming properties to impart good processing properties to the food packaging material and effectively solve the problem of bacterial growth in food packaging materials. On the other hand, the present invention uses the anions of docusate sodium to modify the chitosan quaternary ammonium salt, partially or completely replacing the chloride ions of the chitosan quaternary ammonium salt with the anions of docusate sodium. This can impart good hydrophobicity to the food packaging material, causing water vapor to accumulate on the surface of the material without penetrating, thereby imparting good water vapor barrier properties.

The application provides a formula system and a preparation method for improving the solubility and stability of ceramide NP, and belongs to the cosmetic field.The formula system comprises: an active ingredient, an emulsifier, a thickening agent and a solvent; the active ingredient is ceramide NP; the emulsifier comprises at least one of an anionic emulsifier, a natural polymer emulsifier, a non-ionic emulsifier and a phospholipid emulsifier; and the solvent comprises water, a polyhydric alcohol and an oil-soluble solvent.The formula system has an unexpected technical effect of greatly improving the stability of an oil-in-water cosmetic containing more ceramide NP by selecting suitable emulsifiers, thickening agents and solvents.

The invention relates to the technical field of daily chemicals, in particular to a color-protecting laundry detergent containing plant extracts and a preparation method of the color-protecting laundry detergent. The color-protecting laundry detergent is prepared from the following components in percentage by mass: 12.5 to 18.3 percent of natural anionic surfactant, 6.4 to 9.7 percent of nonionic surfactant, 3.2 to 5.8 percent of plant polyphenol extract, 3.0 to 5.2 percent of fiber affinity natural polymer, 2.1 to 4.0 percent of bio-based chelating aid, 1.8 to 3.5 percent of natural glycoside synergist, 0.9 to 2.3 percent of pH buffering agent, 0.6 to 1.4 percent of antioxidant plant essential oil and the balance of deionized water. The compound protease comprises alkaline protease, neutral protease and papain; the invention aims to solve the technical problems that the existing laundry detergent is poor in color protection effect, insufficient in environmental protection performance and large in damage to fabrics, and provides a laundry detergent product which takes natural plant extracts as core components and has an efficient color protection function.

The invention provides ethylenediamine tetramethylenephosphonic acid modified starch and a preparation method and application thereof.The preparation method includes the steps that a starch dispersion solution and an acid-catalyzed ethylenediamine tetramethylenephosphonic acid solution are mixed, ammonium persulfate is added, and a constant-temperature stirring reaction is conducted under nitrogen protection; after the reaction liquid is cooled, ethanol is added to precipitate a grafted product, and the ethylenediamine tetramethylenephosphonic acid modified starch is obtained. According to the ethylenediamine tetramethylenephosphonic acid modified starch, ethylenediamine tetramethylenephosphonic acid and natural polymer starch are grafted to form a polymer-based heavy metal trapping agent, synchronous and efficient removal of multiple metals in strongly acidic wastewater can be realized, and the pH value of the wastewater does not need to be pre-adjusted.

This invention discloses a cross-linked copolymer coating for negative electrodes, its preparation method, and its application, relating to the field of solid-state battery negative electrode protection technology. The coating is formed by in-situ copolymerization of a precursor composition consisting of carbonate monomers with unsaturated double bonds, hydroxyl-rich natural polymer derivatives, lithium salts, and an initiator. The rigid cellulose skeleton in the copolymer regulates the degree of polymerization of the carbonate monomers through a hydrogen bond network, forming a protective layer with a rigid-flexible block structure, resulting in a uniform and dense SEI film. The hydrogen bond anchoring effect of high-density hydroxyl and carbonyl groups inhibits polycarbonate segment degradation and improves interfacial chemical stability. The three-dimensional hydrogen bond network endows the coating with excellent mechanical strength and flexibility, synergistically buffering volume changes and inhibiting lithium dendrite growth. This preparation process is simple and controllable, effectively reducing the probability of battery short circuits and improving safety performance and cycle stability.

The invention discloses biomimetic mineralized porous aerogel as well as a preparation method and application thereof, and belongs to the technical field of natural polymer-based composite materials. The preparation method comprises the following steps: dissolving sodium alginate powder in a weakly alkaline aqueous solution containing phosphate to obtain a uniformly dispersed precursor solution; freezing treatment is performed to form frozen gel with an ice crystal template structure; immersing the frozen gel into a solution containing calcium ions, and synchronously realizing crosslinking of a sodium alginate network and in-situ mineralization of hydroxyapatite at low temperature to obtain mineralized composite gel; finally, the mineralized composite gel is subjected to solvent replacement and normal-pressure drying treatment, and the biomimetic mineralized aerogel is prepared. According to the method, ionic crosslinking and in-situ mineralization are synergistically realized through a one-step method, the process is simple and efficient, expensive equipment is not needed, and the cost is low. The prepared aerogel has a rich pore structure, a high specific surface area and good biological activity, and has a wide application prospect in the fields of environmental adsorption materials, biological scaffold materials and the like.

The present application relates to the technical field of bamboo fiber composite material, in particular to a purification preparation method of bamboo fiber reinforced natural polymer composite material. The bamboo raw material is crushed and treated by steam explosion to obtain primary bamboo fiber; the primary bamboo fiber is sequentially subjected to organic solvent dewaxing treatment and oxidation system selective delignification treatment to obtain purified bamboo fiber; the purified bamboo fiber is treated in a tannin acid solution to form a polyphenol interface layer on the surface thereof; and a solution containing polyvalent metal ions is added to the treated bamboo fiber to form a coordination cross-linking interface layer on the surface of the bamboo fiber. The present application constructs a stable interface layer between the fiber and the natural polymer matrix. The interface layer can effectively transfer stress, significantly improve the tensile strength, bending strength and shear strength of the composite material, and solve the problem of weak interface and easy delamination of traditional natural composite materials.

The invention relates to nervonic acid-loaded near-infrared light response type injectable hydrogel as well as a preparation method and application thereof, and belongs to the technical field of biological engineering. According to the invention, P (NIPAM-co-NHMAM) and a modified natural polymer material are combined to prepare a temperature-responsive hydrogel capable of realizing reversible volume shrinkage / expansion at a specific temperature, near-infrared light physiotherapy and irradiation are combined to damage local skin, and the hydrogel is stimulated to realize reversible volume deformation by controlling tissue temperature, so that the temperature-responsive hydrogel can be used for preparing the hydrogel with the reversible volume shrinkage / expansion at the specific temperature. Therefore, accurate and wireless space-time regulation and control of nervonic acid release behaviors are realized. Therefore, the nervonic acid loaded near-infrared light response type injectable hydrogel disclosed by the invention can realize efficient carrying and light response controllable release of nervonic acid, promotes functional recovery after spinal cord injury, and has a relatively good application prospect and research significance.

The invention provides a sealing material for wet tissues as well as a preparation method and application of the sealing material. The sealing material comprises a hydrophobic oil phase and temperature-sensitive microspheres, the temperature-sensitive microspheres are dispersed in the hydrophobic oil phase to form a heterogeneous system; the temperature-sensitive microsphere is of a core-shell structure, and the core-shell structure comprises an inner core and an outer shell wrapping the inner core; the inner core comprises a temperature-sensitive cross-linked network and polysaccharide capable of being subjected to ionic cross-linking, and the shell is a porous shell body network and is formed by carrying out copolymerization reaction on a natural polymer derivative capable of being subjected to photo-crosslinking and a comonomer containing an active chemical group. The temperature-sensitive microspheres with core-shell structures are designed to cooperate with the hydrophobic oil phase, rapid hemostasis of dynamic and bleeding wet tissues is realized through a dual drainage mechanism of instantaneous drainage of the hydrophobic oil phase and active pumping of the temperature-sensitive inner core, and then stable chemical bonding is formed through cross-linking of the shell and tissue protein, so that the rapid hemostasis of the dynamic and bleeding wet tissues is realized. And the wet tissue is sealed.

The present application relates to a kind of photo-crosslinkable polymer with anti-UV effect, its preparation method and application, with the anti-UV effect of small molecule compound is connected to the hydrophilic natural polymer skeleton by chemical bond connection mode, while introducing photo-crosslinkable (methyl) acryl, prepare the photo-crosslinkable polymer with anti-UV effect, its solution is irradiated after specific wavelength light, under the action of photoinitiator, (methyl) acryl is initiated crosslinking polymerization, form the water gel that does not flow, form physical barrier in contact site, block external ultraviolet radiation or pollution.Anti-UV small molecule is connected by chemical bond in crosslinking network, play out sunscreen effect, while, the mechanical strength of gel network can resist water impact and the penetration of sweat, so that the sunscreen water gel of the present application is in extension sunscreen molecule's retention time, also reduce the security risk of small molecule sunscreen agent penetration into skin.

The present disclose relates to a high-reactivity hydrogel particle and preparation method therefor and use thereof. The preparation method comprises the following steps: (1) performing polymerization reaction of double-bond modified polyethylene glycol, a modified natural polymer and an optional active functional monomer to obtain a gel; (2) smashing the gel to obtain a gel particle; and (3) performing enzymolysis reaction of the gel particle and an enzyme to obtain the hydrogel particle with reactivity. The double-bond modified polyethylene glycol has a double bond and a polyethylene glycol chain segment, the modified natural polymer has sulfydryl or a double bond, the active functional monomer is selected from a sulfydryl functionalized biological adhesive peptide or sulfydryl functionalized cholesterol, and the enzyme is an enzyme corresponding to the natural polymer. The obtained hydrogel particle has high reactivity and can be used for subsequent secondary crosslinking. The hydrogel particle also has good biocompatibility.

The invention discloses a high-strength self-lubricating three-layer nested medicine-carrying hollow cervical cerclage band with an auxiliary miscarriage prevention function and a preparation method of the cerclage band, and belongs to the technical field of medical instruments. Degradable polyester monofilaments are woven into a hollow round rope, and the hollow round rope and a medical curved needle are integrated; then carrying out polydopamine-polyethylene glycol double-layer modification on a copper-based metal organic framework (Cu-MOF), and loading active molecules; then mixing the drug-loaded Cu-MOF with collagen natural polymer sol, and uniformly filling the gel into the inner cavity of the round rope and forming a three-dimensional bracket through synchronous drawing type micro-perfusion and light-enzyme synergistic cross-linking; then constructing a transient hydrated lubricating layer on the surface; and finally carrying out ethylene oxide final sterilization to obtain a finished product. The cervical cerclage band device provided by the invention simultaneously provides degradable mechanical support, collagen scaffold induction and long-acting slow release regulation, has a low-friction implantation characteristic, and can be well used for preventing or treating middle and late abortion and premature delivery caused by cervical insufficiency.

This invention discloses a fabrication process and control method for a free-curvature bionic artificial muscle fan blade, belonging to the field of bionic artificial muscle fan blade technology. It involves mixing sodium alginate, a natural polymer, with an ionic liquid to prepare a biomass gel electro-actuated membrane with high output force density and high strength at room temperature. A biomass gel conductive ink, made by blending gallium indium tin alloy with sodium alginate powder, is used as the electrode film. The resulting artificial muscle fan blade exhibits high energy conversion efficiency, low starting voltage, fast response speed, and higher structural strength at room temperature. Finally, the fan-shaped electrode is divided into several regions, which can be independently powered to control the curvature effect. This invention provides a simple fabrication process and control method for a free-curvature bionic artificial muscle fan blade, with stable structure, rapid deformation, and strong controllability, offering new ideas for the research and application of artificial muscle devices.

The invention relates to the technical field of hemostatic materials, in particular to composite hemostatic gel as well as a preparation method and application thereof. The composite hemostatic gel is prepared from the following components in percentage by mass: 0.5 to 3 percent of carboxymethyl chitosan, 0.5 to 5 percent of trehalose, 1 to 10 percent of glycerol, 0.1 to 2 percent of carbomer, 0.1 to 2 percent of recombinant blood coagulation factor III, 0.005 to 0.05 percent of benzalkonium chloride and the balance of Tris-HCl buffer solution. Based on the synergistic effect of a natural high polymer material carboxymethyl chitosan and a bioactive component recombinant blood coagulation factor III, the gel constructs a'physical adsorption-blood coagulation activation 'dual hemostasis pathway, realizes a rapid and multi-mechanism hemostasis function, has antibacterial and repair promoting characteristics, can be widely applied to various bleeding scenes such as cutting wounds and surgical wounds, and has wide application prospects. The wound healing is effectively promoted.

A novel binding agent may be produced using a powder made by grinding a substance known as a spent mushroom substrate. Such a substance is a waste product of agricultural processes, and yet it contains a high quantity of mycelium, which in turn includes chitin, a natural polymer, that may be used as a key ingredient of the binding agent. Ganoderma lucidum fungi may be a preferred SMS because of its rich chitin content. The novel article, such as a mixed-density particle board, made from bio-composite materials, may be produced by a hot-pressing process using a mixture of the binding agent and a plurality of particles of at least a first natural substance, such as Coco coir to form the article.

The invention discloses a bionic cross-linked film-forming repair dressing containing mussel mucoprotein and a preparation method of the bionic cross-linked film-forming repair dressing, and relates to the technical field of medical instruments. The bionic crosslinking film-forming repair dressing containing the mussel mucoprotein is prepared from the following components in parts by weight: 30 to 40 parts of bionic crosslinking agent, 25 to 35 parts of humectant, 10 to 20 parts of natural high polymer material, 1 to 10 parts of mussel mucoprotein, 1000 parts of purified water and 5 to 15 parts of pH regulator. PEG-DOPA is formed through cross-linking, the DOPA content and stability are remarkably improved, the adhesion-repair-anti-inflammatory effect of mussels mainly depends on the dopa content, the effect of the dressing is remarkably enhanced through improvement of the DOPA content and stability, the dressing is more convenient to use through the flexibility change of a film, the dressing is more suitable for dynamic and wet wounds, and the application range of the dressing is widened. The medicine has a remarkable effect on chronic ulcer and burn.