6412 results about "Methacrylic acid" patented technology

The invention relates to a high / low-temperature-resistant wear-resistant tear-resistant fluorosilicone rubber compound and a preparation method thereof, and belongs to the technical field of special rubber materials, the high / low-temperature-resistant wear-resistant tear-resistant fluorosilicone rubber compound comprises the following components: raw fluorosilicone rubber, a reactive liquid rubber compatibilizer, a reinforcing filler, a tear-resistant aid, a high-temperature-resistant aid, a vulcanizing agent, an accelerant, an anti-aging agent and an anti-attrition filler, the provided reaction type liquid rubber compatibilizer contains vinyl carboxyl liquid fluorosilicone rubber, the tear-resistant auxiliary agent contains zinc polymethacrylate, the high-temperature auxiliary agent contains vinyl fluorosilane modified carbon nanotubes, and the anti-friction filler contains molybdenum disulfide and layered nano zirconium phosphate which are treated by oxygen plasma. The high and low temperature resistance stability, oil resistance, wear resistance and tear strength of the fluorosilicone rubber are synergistically improved by regulating and controlling the multi-cross-linked network structure of the fluorosilicone rubber, strengthening the interface action of the rubber and the filler and optimizing the composite vulcanization system, meanwhile, structuralization of a rubber compound is prevented by optimizing the preparation process, and the requirement for adaptability to severe working conditions is met.

The invention relates to the technical field of textiles, and discloses a cool and washable bio-based nylon 56 fabric and a preparation method thereof. The preparation method of the cool and washable bio-based nylon 56 fabric comprises the following steps: loading modified nano aluminum oxide on modified aluminum nitride microchips to obtain a composite cool material; nylon 56, an ethylene-methyl acrylate-glycidyl methacrylate terpolymer, polypentamethylene guanidine hydrochloride and a composite cool feeling material are subjected to blending extrusion and melt spinning, and then the bio-based nylon 56 fabric is woven. Mixing the composite modified boron nitride and ethanol to obtain finishing liquid; spraying the finishing liquid on one side of the bio-based nylon 56 fabric, and drying to obtain the cool washable bio-based nylon 56 fabric. The cool and washable bio-based nylon 56 fabric disclosed by the invention has excellent cool feeling, antibacterial property, washable property, moisture absorption property and unidirectional perspiration property.

The embodiment of the invention discloses a preparation method of exosome-loaded hydrogel, the exosome-loaded hydrogel and application of the exosome-loaded hydrogel. A specific embodiment of the method comprises the following steps: carrying out oxidation treatment on hyaluronic acid; carrying out mixed reaction on oxidized hyaluronic acid and methacrylic anhydride under a preset environmental condition to obtain a first mixed solution; performing dialysis and freeze-drying treatment on the first mixed solution to obtain target oxidized hyaluronic acid; adding the target oxidized hyaluronic acid into the exosome solution to obtain an exosome-loaded oxidized hyaluronic acid solution; the exosome-loaded oxidized hyaluronic acid solution and polylysine are subjected to a mixed reaction, the exosome-loaded hydrogel is obtained, and the mass ratio of target oxidized hyaluronic acid to polylysine in the exosome-loaded hydrogel ranges from 1 to 2. According to the embodiment, the mechanical property and controllable degradability of the exosome-loaded hydrogel can be improved, so that the applicability of the exosome-loaded hydrogel and the retention capacity and activity of the exosome are improved.

The invention discloses a hydrophilic polyacrylate / epoxy silica sol composite coating and a preparation method thereof. The composite coating is prepared from a polyacrylate epoxy silica sol solution containing carboxyl and a polyethylene glycol side chain through blending, coating, drying and heating crosslinking. The polyacrylate is synthesized by taking methyl methacrylate, methacrylic acid, hydroxyethyl methylacrylate and allyl polyethylene glycol as comonomers through a solution free radical copolymerization method, and the epoxy silica sol solution is prepared by taking tetraethoxysilane and gamma-glycidoxypropyltrimethoxysilane as raw materials through a solution polymerization method. The composite material is prepared through a sol-gel and core-shell preparation process. The preparation method comprises the following steps: carrying out solution blending on polyacrylate and epoxy silica sol, and carrying out coating, drying and other processes to generate the cross-linked polyacrylate / epoxy silica sol composite coating through a cross-linking reaction between carboxyl and epoxy. The prepared composite coating has the characteristics of long durability, wear resistance, hydrophilicity, antifogging, protein adsorption resistance and the like.

The invention provides a degradable environment-friendly packaging material and a preparation process thereof, and belongs to the technical field of packaging materials. The preparation method comprises the following steps: preparing the modified nano montmorillonite; preparing a composite antibacterial additive; preparing a barrier additive; and preparing the degradable environment-friendly packaging material. The preparation method comprises the following steps: by taking methacrylic acid (2-dimethylaminoethyl) ester and acrylic acid as raw materials, modifying nano-montmorillonite under the initiation of benzoyl peroxide, performing quaternary ammonium salinization, and performing in-situ synthesis of nano-zinc oxide on the surface of the quaternary ammonium salinized montmorillonite through a hydrothermal reaction to prepare the composite antibacterial additive. When the composite antibacterial additive is added into polylactic acid to prepare a packaging material, the growth of various microorganisms such as bacteria and fungi can be effectively inhibited, the packaging material is endowed with strong antibacterial protection capability, and the composite antibacterial additive has a more lasting antibacterial effect so as to prolong the antibacterial validity period of the packaging material.

The invention provides an anti-corrosion Teflon coating as well as a preparation method and application thereof, and belongs to the technical field of coatings. The preparation method comprises the following steps: irradiating polytetrafluoroethylene micro-powder, performing graft modification on the irradiated polytetrafluoroethylene micro-powder and glycidyl methacrylate, reacting with phosphorus oxychloride and polydopamine modified graphene, adding into a Teflon primer, and uniformly stirring and mixing to obtain the anti-corrosion Teflon coating. The anti-corrosion Teflon coating prepared by the invention has good high-temperature resistance, corrosion resistance, rust resistance, mechanical properties, wear resistance, scratch resistance, medium resistance and the like, can effectively resist high-wear-resistance environments such as sliding friction, impact friction and cavitation friction and high-corrosion environments such as acid media and alkaline media, and has a wide application prospect.

The present invention belongs to the technical field of biomedical materials. Disclosed are a methacrylate, a succinate-diesterified starch, a preparation method therefor and the use thereof in an in-situ filler for corneal defects. The methacrylate, succinate-diesterified starch is prepared by means of performing graft carboxylation on starch and then grafting a double bond. The in-situ filler for corneal defects consists of the methacrylate succinate-diesterified starch (StacMA), gelatin methacryloyl (GelMA), a photoinitiator and a solvent. The corneal filler has a good biocompatibility, an excellent photoresponsive adhesion property and excellent mechanical properties, and can be used for promoting the regeneration of the natural structure of a damaged cornea and the reconstruction of visual function.

The invention relates to the technical field of degradable plastics, and provides biodegradable plastic particles as well as a preparation method and application thereof. The biodegradable plastic particles comprise the following components in parts by weight: 50-80 parts of PLA, 20-50 parts of PBAT, 5-20 parts of a filler, 1-8 parts of a flexibilizer, 1-5 parts of a lubricant and 5-10 parts of a modifier. The modifier comprises a polylactic acid-polyethylene glycol block copolymer and a polycaprolactone-polyglycidyl methacrylate block copolymer in a mass ratio of (1: 19)-(19: 1). According to the technical scheme, the problems of poor flexibility and strength of plastic particles in related technologies are solved.

A biodegradable polymer composite, a method of making the same and use for same are provided. The biodegradable polymer composite has about 30 to 99.5% by weight of a polymer selected from a group consisting of polybutylene adipate terephthalate (PBAT), polybutylene succinate (PBS), polyhydroxyalkanoates (PHA), and polycaprolactone (PCL) grafted with a compatibilizer selected from a group consisting of maleic anhydride, glycidyl methacrylate, pyromellitic anhydride, acrylic acid, polyacrylic acid, methylene diphenyl diisocyanate, poly(glycidyl methacrylate, copolymer(s) of glycidyl methacrylate; and about 0.5 to 50 % by weight a nano-filler or a micro-filler. The biodegradable polymer composite does not contain polylactic acid. Surfaces of the nano-filler or the micro-filler may be modified using a grafting agent so that the biodegradable polymer composite has enhanced mechanical properties, increased heat resistance, compostablity and / or improved processability. The biodegradable polymer composite may be used to make flexible articles, such as a freezer wrap and a farming sheet.

The invention discloses a waterborne epoxy resin coating, a preparation method and application in bridge protection, and belongs to the technical field of coatings. The water-borne epoxy resin coating comprises the following raw material components in parts by weight: 15-25 parts of epoxy composite resin emulsion, 100 parts of emulsified asphalt, 3-5 parts of a curing agent and 6-10 parts of water, wherein the epoxy composite resin emulsion is obtained by carrying out a composite reaction on 30-60 parts by mass of epoxy resin, 2-3 parts by mass of an emulsifier, 6-9 parts by mass of an acrylate composition and 1.4-1.6 parts by mass of a co-stabilizer; the acrylate composition is prepared by prepolymerizing 15 to 16 parts by mass of butyl methacrylate, 10 to 12 parts by mass of 2-isopropenyl aniline, 5 to 7 parts by mass of allyl glycidyl ether and 1 to 1.2 parts by mass of allyl polyhedral oligomeric silsesquioxane and then combining the prepolymerized materials with 1 to 3 parts by mass of acrylic acid.

The invention relates to the technical field of polyurethane films, in particular to a long-acting, stable, flexible, impact-resistant and resistance-reducing protective film and a preparation process thereof. According to the invention, the raw materials such as polyethylene glycol, a modified fluorosilicone monomer, isophorone diisocyanate, hydroxyethyl acrylate, an acrylic antifouling monomer, dodecafluoroheptyl methacrylate and the like are added to prepare the anti-drag coating. Mixing a polyurethane thermoplastic elastomer, aminopropyl polydimethylsiloxane, an antioxidant and an ultraviolet light absorber, and carrying out melt extrusion and blow molding to form a film, so as to obtain a flexible impact-resistant base film; and uniformly coating the surface of the flexible anti-impact base film with the anti-drag coating, and carrying out ultraviolet curing to obtain a finished product. The finished product prepared by the invention has good impact resistance, and can effectively reduce frictional resistance, so that the finished product has wide application prospects in the technical field of polyurethane films.

The invention relates to the technical field of biodegradable materials, and discloses a full-biodegradable bamboo fiber film material and a preparation method thereof, the full-biodegradable bamboo fiber film material comprises the following raw materials by weight: 30-50 parts of modified bamboo fiber, 20-40 parts of a biodegradable polymer, 3-8 parts of a plasticizer, and 1-5 parts of a cross-linking agent. Acrylic acid grafted hydroxyethyl methylacrylate is grafted to epoxy resin containing azobenzene side chains to form a grafting product of a latticed structure, and the grafting product and hydroxyl groups on bamboo fibers form ether bonds to modify the bamboo fibers. The latticed structure can effectively improve the mechanical property of the film, and azobenzene is grafted to the side chain of bisphenol A epoxy resin, so that the epoxy resin has better degradability.

Provided is a dispersant for hydraulic compositions that has high dispersibility and can reduce the viscosity of the hydraulic composition. [Solution] A dispersant for hydraulic compositions comprising: a polymer (P) having a structural unit (1) formed from a compound represented by general formula (1), and a structural unit (2) formed from a compound containing at least one selected from acrylic acid, methacrylic acid, fumaric acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, and salts thereof; and an ether compound (A) which is a compound in which 1 to 500 moles of an alkylene oxide having 2 to 4 carbon atoms are added to 1 mole of a mono- to tetrahydric aliphatic alcohol having 2 to 24 carbon atoms, wherein the mass average molecular weight of the polymer (P) is 5,000 to 5,000,000, and the mass ratio (A / P) of the ether compound (A) to the polymer (P) is greater than 0 and less than or equal to 0.25.

Disclosed in the present invention are a fluorosilicone-modified low-surface-energy antifouling coating and a preparation method therefor. The coating comprises the following components in parts by weight: 11-15 parts of butyl acrylate, 3-4 parts of dodecafluoroheptyl methacrylate, 3-4 parts of vinyl-terminated polydimethylsiloxane, 3-4 parts of 2-hydroxy-4-acryloyloxybenzophenone, 30-38 parts of methyl isobutyl ketone, 0.15-0.25 parts of azobisisobutyronitrile, 0.1-0.2 parts of sodium hydroxide, 2-3 parts of modified titanium dioxide nanoparticles, and 0.5-1.5 parts of 3-aminopropyltriethoxysilane. In the present invention, vinylpentamethyldisiloxane reacts with decamethylcyclopentasiloxane to prepare vinyl-terminated polydimethylsiloxane; a titanium dioxide precursor is mixed with polydopamine nanoparticles for modification to prepare modified titanium dioxide nanoparticles; and then the components above are mixed to prepare the fluorosilicone-modified low-surface-energy antifouling coating. The coating has low surface energy and good adhesion and ultraviolet resistance.

The invention discloses a construction method and application of an electrochemical luminescence (ECL) antifouling sensor based on zwitter-ion hydrogel, and belongs to the technical fields of photoelectric sensing analysis, interface antifouling and environmental science. According to the invention, the hydrogel based on sulfobetaine methacrylate zwitterions and bovine serum albumin is used as the antifouling coating, so that the adsorption of biological proteins and bacteria is effectively hindered, and the service life of the sensor is prolonged. Meanwhile, the interior label Au (at) luminol is packaged in the antifouling hydrogel, so that the integration of interface antifouling and ratio detection is realized, the detection accuracy is improved, and the construction process of the ECL sensor is simplified. The constructed ECL anti-pollution sensor has high sensitivity to chloramphenicol detection, the detection limit is 0.39 pM, and the ECL anti-pollution sensor is suitable for trace detection of antibiotics in seawater.

The invention discloses injectable hydrogel with redox activity and electroactivity as well as a preparation method and application of the injectable hydrogel, and belongs to the technical field of medical materials. The preparation method comprises the following steps: reacting methacrylic anhydride and polysaccharide molecules in a solvent to prepare a double-bond functional polymer; the preparation method comprises the following steps: firstly, pre-polymerizing dopamine in a solvent, and then adding MOF (Metal Organic Framework) to carry out polymerization reaction, so as to prepare dopamine modified MOF; reacting the dopamine modified MOF, EDOT and ferric salt in a solvent, and collecting the precipitate to prepare a nano filler; the preparation method comprises the following steps: jointly dispersing the double-bond functional polymer, active polypeptide, a photoinitiator and nano filler into a solvent, and carrying out photocuring cross-linking. The preparation condition is mild, gel forming is rapid, the method is simple, the prepared hydrogel has injectable performance and conductive performance, catalytic activity of natural enzyme can be simulated, active oxygen removal can be achieved in the early stage of myocardial ischemia, electrical conduction of infarction parts can be enhanced, and effective recovery of cardiac functions can be achieved.

The invention discloses an in-situ injectable bone repair adhesive material with a double-sequence osteogenesis promoting function as well as a preparation method and application of the in-situ injectable bone repair adhesive material. The preparation method comprises the following steps: 1) sequentially carrying out dual chemical grafting modification on hyaluronic acid by using methacrylic anhydride and dopamine hydrochloride to obtain a DA-HAMA biomacromolecule with UV curing and adhesion functions; (2) preparing a Ca < 2 + > physical cross-linked sodium alginate microsphere material loaded with an osteogenesis promoting drug by using a micro-fluidic system; and (3) preparing a DA-HAMA solution under dark and heating conditions, adding the vascular promoting factors and the drug-loaded microspheres when the DA-HAMA solution is cooled to room temperature, uniformly mixing, and carrying out centrifugal defoaming and irradiation sterilization to obtain the in-situ injectable bone repair adhesive material. The bone repair adhesive material has the functions of being degradable, injectable, capable of being adhered in a wet state, promoting blood vessels and promoting bone formation, and a brand new strategy is provided for bone defect repair.

The invention discloses a dual-curing 3D printing resin, the dual-curing 3D printing resin comprises an acrylate oligomer containing a dynamic covalent bond and a blocked isocyanate cross-linking agent, and the acrylate oligomer containing the dynamic covalent bond is obtained by reacting an isocyanate-terminated oligomer with acetoacetic acid ethylene glycol methacrylate. The internal molecular structure and the crosslinking density of the dual-curing 3D printing resin can be changed through heat treatment after light curing, and the dual-curing 3D printing resin has excellent stability and can be stored and used in a single-component mode.

The invention discloses a hydrogel wound dressing for promoting healing of infectious wounds. The hydrogel wound dressing is prepared from the following raw materials: oxidized methacrylic acid hyaluronic acid, waterborne polyurethane, polylysine, cannabidiol, neomycin sulfate and 2-roots alcohol. The invention also provides a preparation method of the hydrogel wound dressing and application of the hydrogel wound dressing in preparation of products for repairing infectious wounds. The wound dressing provided by the invention has a microporous structure, good biocompatibility and biodegradability, and can be used for stopping bleeding, reducing wound infection and promoting cell proliferation and wound healing.

The invention relates to the field of coatings, and discloses an outer wall light radiation heat preservation and heat insulation decorative sheet and a preparation method thereof.A radiation refrigeration layer on the surface of the outer wall light radiation heat preservation and heat insulation decorative sheet comprises modified acrylate resin, silicon dioxide, ground calcium carbonate, talcum powder, modified hollow glass beads and auxiliaries; the modified acrylate resin is prepared by copolymerizing perfluorooctyl ethyl acrylate, methyl methacrylate, modified isocyano ethyl methacrylate and vinyltriethoxysilane, and the modified isocyano ethyl methacrylate is prepared by using salicylaldehyde and benzothiazole-2-formaldehyde as well as 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate as an initiator and using 2, 3, 4-trimethyl-1, 3-pentanediol monoisobutyrate as an initiator. The preparation method comprises the following steps: reacting amino groups at two ends of 1, 5-naphthylenediamine with DOPO, carrying out nucleophilic addition reaction with DOPO, and grafting with isocyano ethyl methacrylate. The modified hollow glass beads are prepared by using tetrabutyl titanate as a titanium source through a sol-gel method, and the prepared radiation refrigeration layer has the super-amphiphobic self-cleaning effect, the radiation refrigeration effect is good, and meanwhile the flame retardant property and the antibacterial effect are excellent.

The invention discloses a polytetrafluoroethylene film with high tensile strength and a preparation process thereof, and relates to the technical field of polytetrafluoroethylene films. The preparation method comprises the following steps: step 1, preparing a composite raw material: S1-1, sequentially putting a tetrafluoroethylene copolymer into acetone and methanol to be soaked, washed and dried; dispersing in a glycidyl methacrylate-methanol solution, and carrying out irradiation grafting in a nitrogen atmosphere; filtering, washing and drying to obtain an epoxy tetrafluoroethylene copolymer; s1-2, sequentially putting an epoxy tetrafluoroethylene copolymer and a composite filler into tetrahydrofuran, stirring for 24-48 hours at the temperature of 70-75 DEG C in a nitrogen atmosphere, filtering, washing and drying to obtain a composite raw material; 2, mixing polytetrafluoroethylene, the composite raw material and carboxylated polyphenylene sulfide to obtain a mixture; performing cold press molding and temperature-controlled sintering to obtain a basic film; 3, the basic film is subjected to turning forming and continuous rolling, and the polytetrafluoroethylene film is obtained.

The invention discloses a polyethylene cable with flexibility and fire resistance and a preparation method of the polyethylene cable, and relates to the technical field of polyethylene cables, the polyethylene cable comprises a cable core and a polyethylene protective sleeve, the polyethylene protective sleeve comprises the following components, the plastic is prepared from the following components in parts by mass: 50 to 70 parts of low-density polyethylene, 20 to 30 parts of modified polyolefin elastomer, 10 to 25 parts of lignin modified copolymer, 0.5 to 1 part of antioxidant, 0.6 to 1.2 parts of zinc oxide and 1 to 2 parts of talcum powder. The modified polyolefin elastomer is prepared from POE-g-MAH (Polyolefin Elastomer-g-MAH) and a DOPO Schiff base derivative; the lignin modified copolymer is prepared from lauryl methacrylate, isobornyl methacrylate and a lignin macroinitiator.

The invention discloses a waterborne acrylic acid-polyurethane composite emulsion, a waterborne acrylic acid-polyurethane composite paint, and a preparation method and application of the waterborne acrylic acid-polyurethane composite emulsion. According to the preparation method of the water-based acrylic acid-polyurethane composite emulsion, a core-shell structure polyacrylic acid-polyurethane emulsion is synthesized in situ by utilizing a core-layer monomer pre-emulsion and a shell-layer monomer pre-emulsion through a semi-continuous seed emulsion polymerization method. The shell layer of the core-shell structure has hydrophilic functional groups including carboxyl, sulfo group and hydroxyl, so that the emulsion has a self-thickening effect, and rheological properties and good constructability required by the coating can be provided. A nonionic hydrophilic group composite sodium sulfonate type post chain extender is selected as waterborne polyurethane, the emulsifying capacity is high, the emulsion stability is good, strong-acid monomers such as acrylic acid and methacrylic acid can be selected, high-thixotropy resin can be obtained through adjustment, meanwhile, the PA content can be effectively increased, the water resistance and weather resistance of a paint film can be improved, and the water resistance and weather resistance of the paint film can be improved. Therefore, the requirements of the automobile paint on moisture resistance, especially high-pressure flushing resistance, are met.

The invention discloses a temperature / CO2 dual-response zwitterionic hydrogel profile control agent, which is prepared by taking a monomer A, a monomer B and a monomer C as raw materials, adding a cross-linking agent and an initiator, and carrying out polymerization reaction in a water medium. The monomer A is selected from any one of acrylamide, acrylic acid and 1-vinyl-2-pyrrolidone; the monomer B is selected from any one of [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, 2-methacryloyloxyethyl phosphorylcholine and 3-((2-(methacryloyloxy) ethyl) dimethylamino) propionic acid inner salt; and the monomer C is selected from any one of 2-(dimethylamino) ethyl methacrylate, dimethylamino propyl methacrylamide and polyethyleneimine. The profile control agent has double swelling mechanisms, has outstanding temperature and salt resistance, resists 220000 mg / L of mineralization water, is suitable for high-salt reservoirs, and is good in long-term aging property.

The invention discloses a self-healing injectable photo-crosslinking dual-network hydrogel and a preparation method thereof.The preparation method comprises the steps that silk fibroin is subjected to methacrylation modification through a glycidyl methacrylate solution, then dextran of the silk fibroin is subjected to an oxidation reaction through a sodium periodate solution, oxidized dextran is generated, and the self-healing injectable photo-crosslinking dual-network hydrogel is obtained; the amino group in the modified silk fibroin and the aldehyde group of the oxidized dextran are subjected to a Schiff base cross-linking reaction to form the double-network hydrogel. The hydrogel with the double-network structure prepared by the invention is more compact in structure, so that the hydrogel has a series of excellent performances such as injectability, relatively good adhesion, good mechanical property, self-healing property and slow release property after drug loading while having safety.

The invention relates to the field of biomedical materials, in particular to a composite hydrogel microsphere with excellent cell adhesion performance and a preparation method and application thereof, and the preparation method comprises the following steps: (1) modifying silk fibroin with glutathione to obtain sulfydryl modified silk fibroin SF-GSH; (2) adopting methacrylic anhydride as a double-bond introduction reagent, introducing a methacrylate group on hyaluronic acid and forming a carbon-carbon double bond to obtain double-bond modified hyaluronic acid HA-MA; (3) mixing the sulfydryl modified silk fibroin SF-GSH with double bond modified hyaluronic acid HA-MA, and adding lactobionic acid to prepare a composite hydrogel microsphere precursor solution; and (4) preparing the composite hydrogel microsphere precursor solution into the composite hydrogel microsphere containing lactobionic acid. Compared with single hyaluronic acid hydrogel, the composite hydrogel microspheres prepared by the preparation method provided by the invention have good biocompatibility.

The invention discloses hyaluronic acid / alginic acid dual-network hydrogel as well as a preparation method and application thereof. The hyaluronic acid / alginic acid double-network hydrogel comprises a first network and a second network which are not crosslinked with each other, and the first network and the second network are distributed in the hydrogel in an interpenetrating manner; the first network comprises an ionic cross-linked network of alginic acid with cell adhesion sites and calcium ions, and the second network comprises a chemical cross-linked network formed by covalent cross-linking of methacrylic anhydride modified hyaluronic acid. The hyaluronic acid / alginic acid double-network hydrogel disclosed by the invention is short in curing time, supports three-dimensional spreading of cells and formation of capillary lumens, has good mechanical stability, and has good application prospects in the aspects of three-dimensional culture of the cells, tissue engineering construction and the like.

The invention discloses a high-strength silk fibroin / hydroxyapatite bone repair material and a preparation method thereof, and belongs to the field of biomedical materials. Methacrylic acid esterified silk fibroin and methacrylic acid esterified nano-hydroxyapatite are used as organic matter and inorganic filler, and the interface bonding capacity and dispersion stability between the organic component silk fibroin and the inorganic component hydroxyapatite are improved through photo-crosslinking; and performing high-temperature hot-pressing molding to obtain the silk fibroin / hydroxyapatite bone repair material. The bone repair material has relatively strong mechanical properties, osteogenesis induction capability, good biocompatibility and degradability, and has a wide application prospect in the field of bone defect repair.

The invention discloses a super-hydrophobic anti-icing coating for a power transmission line and a preparation method, and belongs to the technical field of preparation of anti-icing coatings. The super-hydrophobic anti-icing coating for the power transmission line is composed of a coating wrapping the surface of the power transmission line, and the coating is composed of the following components in parts by weight: 34-45 parts of composite resin, 8-14 parts of a composite ice melting agent, 10-18 parts of deionized water, 1-3 parts of hexadecyl trimethoxy silane and 50-58 parts of tetrahydrofuran, the composite resin is prepared from carboxyl multi-walled carbon nanotubes, isopropanol, tetraethoxysilane, a silane coupling agent KH-550, perfluorodecyl trimethoxysilane, butyl acrylate, methyl methacrylate and dodecafluoroheptyl methacrylate, and the composite ice melting agent is prepared from pyridine-2, 6-dicarboxylic acid, thionyl chloride and nicotinic acid hydrazide. The coating prepared by the method has excellent hydrophobicity, wear resistance and anti-icing effect.

The invention discloses a leak-free core-shell hydrogel microsphere delivery system for non-contact flora transplantation as well as a construction method and application of the leak-free core-shell hydrogel microsphere delivery system. According to the invention, bacteria are encapsulated in a core of a core-shell microsphere through a two-step photo-initiation emulsion polymerization method of methacrylic acid gelatin, and a non-contact microbiota transplantation system (NMTS) is constructed. The NMTS can be used for biological encapsulation of various strains, shows encapsulation efficiency close to 100%, and has little influence on bacterial activity at the same time. NMTS demonstrates: a shielding effect that protects sealed bacteria from low pH values in the gastrointestinal tract and bile acid disruption; sufficient mechanical strength ensures that bacterial leakage is prevented and the infection risk is eliminated in the whole gastrointestinal tract delivery process; and internal and external substance exchange is realized, and the intestinal microorganism structure is remodeled. The invention provides a unique bacterial cell microencapsulation method which is a non-contact, safe and effective micropopulation transplantation method.