23results about How to "Stable cross-linked structure" patented technology

The invention provides a sodium-ion battery negative electrode material, a preparation method thereof and a sodium-ion battery, and relates to the technical field of battery negative electrode materials. According to the method, oxidized asphalt is used as a soft carbon material, and hydroxyl-rich biomass (chitin, chitosan and lignin) is used as a hard carbon precursor; and mixing the two materials, and performing crosslinking and carbonization treatment to obtain the sodium-ion battery negative electrode material. According to the technical scheme, by adjusting the proportion of soft carbon and hard carbon and optimizing crosslinking conditions, the crosslinking degree between the soft carbon and the hard carbon is improved, formation of a more stable crosslinking structure is promoted, the specific capacity and the rate capability of the negative electrode material can be effectively improved due to the appearance of the crosslinking structure, the rapid charging and discharging capacity of the negative electrode material under high rate is enhanced, and the service life of the negative electrode material is prolonged. The battery can meet the requirement of quick charging, the applicability of the battery in high-power application is expanded, and the battery has wide application prospects in the fields of electric automobiles, energy storage systems and the like.

The invention discloses a fireproof flame-retardant fiber and a preparation method thereof, and relates to the field of fibers. The preparation method comprises the following steps: reacting beta-cyclodextrin with allyl succinic anhydride to prepare terminated beta-cyclodextrin during preparation of the fireproof and flame-retardant fiber; the preparation method comprises the following steps: reacting polyether amine with beta-cyclodextrin to prepare polypseudorotaxane; the polypseudorotaxane and the end-capped beta-cyclodextrin are subjected to a reaction, and polyrotaxane is prepared; the preparation method comprises the following steps: carrying out a reaction on polyrotaxane and allyl dichlorophosphine to prepare modified polyrotaxane; carrying out hydrolytic condensation on dimethoxymethylsilane to prepare an organic silicon monomer; reacting the polyester prepolymer with an organic silicon monomer to prepare modified polyester; and carrying out melt spinning on the modified polyester and the modified polyrotaxane. The fireproof flame-retardant fiber prepared by the invention has good flame retardant property, hydrophilic moisture absorption property and mechanical property.

The invention discloses a beta-naphthol-based trifunctional resin / carbon fiber / diethylenetriamine composite material and a preparation method and application thereof, and belongs to the technical field of polymer resin.The preparation method includes the steps that beta-naphthol-based trifunctional resin and diethylenetriamine are evenly mixed and coated on a plurality of carbon fibers, and after high-temperature curing, pressing and cooling, the beta-naphthol-based trifunctional resin / carbon fiber / diethylenetriamine composite material is obtained; the beta-naphthol-based trifunctional resin / carbon fiber / diethylenetriamine composite material is obtained; the beta-naphthol-based three-functional-group resin is prepared by carrying out polymerization reaction on beta-naphthol, formaldehyde and epoxy chloropropane under the condition of an alkaline medium. Through cross-linking reaction between the beta-naphthol-based trifunctional resin and the curing agent diethylenetriamine with amino, the molecular chain of the epoxy resin is tighter, the intermolecular force is enhanced, a stable cross-linked structure is formed, the curing efficiency of the epoxy resin is improved, and the cured product has higher hardness and glass transition temperature. The doping of the carbon fibers enables the mechanical properties of the epoxy resin to be significantly improved.

The invention discloses an inorganic fiber composite board adhesive with high durability and environmental protection performance and a method, according to the adhesive, rock wool fiber powder and surface modified nanoparticles are combined to form an inorganic filler, a synergistic effect is achieved on a microstructure, and the hardness and wear resistance of the adhesive and the stability of a composite board are effectively improved. By adding the quaternary ammonium salt catalyst, the curing temperature is remarkably reduced, the production efficiency is improved, and complex environments are adapted. And the phosphorus-nitrogen composite flame retardant is adopted, so that the fireproof performance of the composite board is enhanced, a compact carbonized layer is formed in case of fire, and flame diffusion is prevented. And the internal structure of the plate is uniform and stable through the section-by-section heating and pressurizing process, and high-precision application is achieved.

The invention provides an extraction method of spirulina polysaccharide, and belongs to the technical field of plant polysaccharide extraction. The extraction method comprises the steps of wall breaking treatment, enzymolysis, separation and purification. The enzymolysis step comprises the following steps: adding a hydrochloric acid solution into the spirulina polysaccharide extracting solution, adjusting the pH value, and then adding a functional enzyme for enzymolysis to prepare an enzymolysis solution; the preparation method of the functional enzyme comprises the steps of biochar pretreatment, crosslinking and loading. The cross-linking step comprises the following steps: putting pretreated chitin and pretreated charcoal into deionized water, uniformly stirring, adding a glutaraldehyde solution, stirring at room temperature for 3.8-4.2 hours, standing, centrifugally washing, and freeze-drying to obtain a cross-linked carrier; by adopting the method disclosed by the invention, the spirulina polysaccharide yield is high, the total sugar content is high, and the reusability of the functional enzyme is good.

The invention provides a preparation method of carbon fiber reinforced zirconium carbide ceramic, and belongs to the technical field of ceramic. The preparation method comprises the steps of zirconium carbide pretreatment, vinylated carbon fiber preparation, zirconium carbide-carbon fiber preparation, zirconium carbide-carbon fiber modification, material mixing and sintering. The zirconium carbide-carbon fiber modification step comprises the following steps: putting zirconium carbide-carbon fibers into N, N-dimethylformamide, uniformly stirring, adding aminated carbon fibers and sodium ethoxide, carrying out a stirring reaction at 32-36 DEG C for 10-14 h, after stirring is finished, carrying out filtering and washing, carrying out freeze drying, and after drying is finished, naturally recovering to room temperature to obtain the zirconium carbide-carbon fiber composite material. The modified zirconium carbide-carbon fiber is prepared; the ceramic product prepared by the method disclosed by the invention is high in yield, good in mechanical property and excellent in corrosion resistance.

The invention provides a leather ion piezoelectric device and a preparation method and application thereof, and belongs to the technical field of new energy conversion, the leather ion piezoelectric device comprises a device body, and two sides of the bottom of the device body are respectively provided with a stress electrode and a reference electrode; the preparation method of the leather ion piezoelectric device comprises the steps that raw hide obtained after pickling is subjected to tanning, retanning and electrolyte treatment, ion leather is obtained, the ion leather is cut, a device body is manufactured, a stress electrode and a reference electrode are attached to the two sides of the bottom of the device body respectively, and the leather ion piezoelectric device is obtained. The leather ion piezoelectric device provided by the invention has excellent mechanical property, damp-heat-resistant stability, durability and corrosion resistance, and is convenient to transport, store and reuse; the ion piezoelectric device prepared through the preparation method is good in mechanical performance and durable temperature performance, suitable for mechanical energy collection and power generation in a more complex special environment and an actual scene bearing large pressure, and wide in application range.

This invention discloses a method for preparing a copolymer ultrafiltration membrane with a bonded structure. This method combines in-situ suspension polymerization, click reaction, sol-gel method, and solvent-inducible phase separation to prepare the copolymer ultrafiltration membrane. Excellent hydrophilicity and component stability of the ultrafiltration membrane are achieved through stable covalent bonding between tannic acid and the copolymer. This invention also combines in-situ click reaction and sol-gel reaction to stably introduce high-performance resveratrol into the polymer membrane. Stable bonding of the components is achieved through co-hydrolysis and condensation of the copolymer and the siloxane on the modified resveratrol during the film formation process. The polymerization process of this invention is simple and the structure is tunable. The prepared copolymer ultrafiltration membrane not only has excellent hydrophilicity and antifouling ability but also a stable structure.

The invention provides a photolithography coated high-nickel ternary positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials, and the preparation method comprises the following steps: carrying out wet spraying coating on LiNixCoyMn1-x-y-wZrwO2 matrix powder by using a conductive photoresist as a modifier to obtain a coated product, and under the protection condition of an oxygen atmosphere, carrying out wet spraying coating on LiNixCoyMn1-x-y-wZrwO2 matrix powder to obtain the high-nickel ternary positive electrode material. And sequentially carrying out exposure reaction, washing and developing treatment, drying, sieving and iron removal on the coated product by utilizing illumination or thermal radiation to obtain the conductive polymer coated high-nickel ternary positive electrode material. According to the invention, the advantages of good conductivity and stable structure of the conductive polymer are fully utilized, so that the problem of migration resistance of Li < + > on a material interface is reduced in the high-current charging and discharging process of the battery, and dissolution of metal particles on the surface of the material and surface side reaction are inhibited; the obtained high-nickel ternary positive electrode material crystal coated with the conductive polymer is high in first discharge efficiency, good in rate capability and cycle performance, and simple in process operation.

The invention discloses a corrosion-resistant rubber and a preparation method thereof, which relates to the field of rubber, and comprises the following raw materials by weight: 20-60 parts of fluorosilicone rubber; 30-60 parts of modified nitrile rubber; 10-40 parts of EPDM rubber; 10-20 parts of filler; 2-8 parts of accelerator; 5-10 parts of silane coupling agent; 1-5 parts of sulfur; the modified nitrile rubber comprises the following raw materials modified and prepared: nitrile rubber, perfluoropolyether methyl ester, butadiene-styrene copolymer, n-butyl lithium, cyclopentane and zinc stearate. The present application has the effect of improving the corrosion resistance of rubber.

The present invention discloses an intelligent all-round photosensitive 3D printing secondary curing device, comprising a stand and a processing cylinder, the stand is slidably connected to a lifting frame, a loading tray is fixed under the lifting frame, and a plurality of suction nozzles are distributed circumferentially under the loading tray; the processing cylinder is concentric with the loading tray, a plurality of supporting springs are provided at the bottom of the processing cylinder, and a vibration motor is also provided at the bottom of the processing cylinder; compared with the prior art, the present invention improves curing efficiency and quality, optimizes surface finish and aesthetics, enhances workpiece performance and stability, reduces processing dead angles and improves uniformity, improves the degree of automation and ease of operation, and improves environmental protection and energy saving, and shows remarkable effects.

The application discloses a silane modified MXene, a preparation method and application thereof, relates to the technical field of functional material preparation, and adopts a HF etching method to prepare the silane modified MXene by etching MAX powder with in-situ generated hydrofluoric acid through mixing of lithium fluoride and hydrochloric acid. The silane modified MXene builds a'molecular' bridge between two-dimensional materials and organic matters by using the functional groups in silane, and can be stably dispersed in organic phase variable materials. The application provides a preparation method of phase change microcapsules without supercooling and with high enthalpy, mixes organic phase variable core materials containing the silane modified MXene and emulsifier powder, and then adds deionized water to form an emulsion, and adopts a stirring shearing method to form a stable water-in-oil (W / O) microemulsion structure; subsequently, a shell material prepolymer solution is added to perform a polymerization reaction, and phase change microcapsules without supercooling and with high enthalpy are obtained.

The invention discloses a bisphenol A-based hexa-functional-group resin / glass fiber / diethylenetriamine composite material and a preparation method and application thereof, and belongs to the technical field of epoxy resin composites.The preparation method includes the steps that bisphenol A and formaldehyde are heated and stirred to be uniform, then epoxy chloropropane and a NaOH aqueous solution are added, the mixture is heated and stirred to be uniform, then methyl ethyl ketone is added, desalting is conducted, and the bisphenol A-based hexa-functional-group resin / glass fiber / diethylenetriamine composite material is obtained; the preparation method comprises the following steps: mixing bisphenol A-based hexa-functional-group resin and diethylenetriamine, distilling the resin to obtain bisphenol A-based hexa-functional-group resin, uniformly mixing the bisphenol A-based hexa-functional-group resin and diethylenetriamine, coating a plurality of glass fibers with the mixture, and performing high-temperature curing, pressing and cooling to obtain the bisphenol A-based hexa-functional-group resin / glass fiber / diethylenetriamine composite material. The bisphenol A-based hexa-functional-group resin is crosslinked with diethylenetriamine, so that the molecular chain of the epoxy resin is tighter, a stable crosslinked structure is formed, the curing efficiency is improved, and the product has higher hardness and glass transition temperature. The glass fiber is doped, so that the mechanical property of the epoxy resin is remarkably improved.

The invention discloses a GF / TiB2 / TiO2-based super-hydrophobic composite coating and a preparation method thereof.The preparation method comprises the steps that a polydimethylsiloxane modifier, a polyurethane binder, glass fiber powder, TiB2 powder and TiO2 powder are added into an ethyl acetate solvent, and uniform suspension liquid is obtained after sufficient stirring; adding a curing agent of a polydimethylsiloxane modifier into the suspension, fully stirring, and uniformly mixing to obtain the super-hydrophobic composite coating. And uniformly spraying the super-hydrophobic composite coating on a substrate material with a clean surface, and curing to obtain the GF / TiB2 / TiO2-based super-hydrophobic composite coating. The adhesive can adapt to different types of base materials, has good flexibility and can deform along with tiny deformation of the base materials.

The invention discloses a soil solidification complexing agent based on a synergistic effect of biological enzyme and microorganisms as well as a preparation method and application of the soil solidification complexing agent, and belongs to the technical field of microorganism soil solidification. The preparation method comprises the following steps: dissolving levodopa in purified water, adding a carboxylic acid activating agent, and mixing and activating for 20-30 minutes to obtain an activating solution; mixing the activating solution with biological enzyme, reacting for 5-7 hours in an environment with the temperature of 20 + / -2 DEG C, and dialyzing to obtain dialysate; mixing and stirring the dialysate and a microbial bacterial solution to obtain a mixed solution, adjusting the pH value of the mixed solution to 8.0 by using a weak base solution, and cross-linking for 14-18 hours in an environment at the temperature of 20-25 DEG C to obtain a weak cross-linked solution; adjusting the pH value of the cross-linking solution to be neutral by using a weak acid solution, adding a calcium salt solution, mixing, stirring and standing for 12-15 hours to obtain the soil composite curing agent. According to the invention, a cross-linked network structure is constructed by using levodopa, so that the protection on biological enzymes and microorganisms is realized, and the soil solidification capability of the levodopa is improved.

The invention discloses a preparation method of aluminum silicate nanofiber / acrylamide-sodium acrylate copolymer composite aerogel, which comprises the following steps: modifying aluminum silicate nanofiber through an amino silane coupling agent to obtain aminated aluminum silicate nanofiber; carrying out a substitution reaction of amino and chloroalkene on the aminated aluminum silicate nanofiber to introduce double bonds on the surface of the aminated aluminum silicate nanofiber; the preparation method comprises the following steps: by taking aminated aluminum silicate nanofiber with introduced double bonds as a cross-linking agent and acrylamide and acrylic acid as monomers, carrying out cross-linking copolymerization reaction by a solution polymerization method, and freeze-drying reaction liquid to obtain the aluminum silicate nanofiber / acrylamide-sodium acrylate copolymer composite aerogel. The heavy metal ion adsorption capacity of the adsorbent is improved, and the adsorbent is easy to recycle and has excellent durability.

The invention provides a high-temperature-resistant polymer composite material plugging agent as well as a preparation method and application thereof, and relates to the technical field of oil extraction. The high-temperature-resistant polymer composite material blocking agent comprises a reactive high polymer, a polymeric monomer, polyethyleneimine, a cross-linking agent, an initiator, isocyanate modified wollastonite and water, the polymeric monomers comprise acrylamide, N-vinyl caprolactam and isoeugenol methyl ether. The plugging agent is good in plugging effect and excellent in high temperature resistance.

The invention belongs to the technical field of textile printing and dyeing, and particularly relates to a silk treatment method using lucid ganoderma and application. The silk treatment method using the lucid ganoderma comprises the following steps: degumming, preparing a lucid ganoderma extracting solution and treating the silk. According to the treatment method provided by the invention, active substances of lucid ganoderma and sericin are cross-linked and fixed on the surfaces of the degummed silk fibers under the action of ethylene glycol, and a formed cross-linked structure is stable, so that the activity of components can be protected, and the effect of covering odor can also be achieved. As the extraction and decoloration processes of the active substances of the lucid ganoderma and the degumming process of the silk fibers can be synchronously carried out in the same processing device, the working efficiency is greatly improved, and the device has the advantages of simplicity and convenience in operation and high practicability.

The present invention provides a high temperature resistant polymer composite plugging agent and a preparation method and application thereof, and relates to the field of oil production technology. The high temperature resistant polymer composite plugging agent comprises: a reactive polymer, a polymer monomer, polyethyleneimine, a cross-linking agent, an initiator, isocyanate-modified wollastonite and water; the polymer monomer comprises acrylamide, N-vinyl caprolactam and isoeugenol methyl ether. The plugging agent has good plugging effect and excellent high temperature resistance.

This invention discloses a method for preparing a copolymer ultrafiltration membrane. This method combines in-situ suspension polymerization, polyaddition reaction, sol-gel method, and non-solvent-induced phase separation to prepare a copolymer ultrafiltration membrane. Excellent hydrophilicity and component stability of the ultrafiltration membrane are achieved through stable covalent bonding between tannic acid and the copolymer. Furthermore, the in-situ polyaddition reaction and sol-gel reaction are combined to stably introduce high-performance tannic acid into the polymer membrane. Stable bonding of each component is achieved through co-hydrolysis and condensation polymerization of the copolymer and the siloxane on the modified tannic acid during the film formation process. The polymerization process of this invention is simple and the structure is tunable. The prepared material not only has excellent hydrophilicity and antifouling ability but also a stable structure, making it a cross-linked copolymer ultrafiltration membrane with antifouling and antibacterial adhesion properties.

The invention discloses a degradable mulching film prepared by compounding starch wastewater with bamboo fibers and a preparation method of the degradable mulching film, and belongs to the technical field of agricultural mulching films. The mulching film is prepared from the following components in parts by weight: 75 to 90 parts of starch wastewater, 20 to 30 parts of bamboo fiber, 10 to 18 parts of polyvinyl alcohol, 18 to 30 parts of glycerol, 8 to 15 parts of cross-linking agent and 5 to 10 parts of filler. The defect that starch is difficult to form a film is effectively overcome, and powerful support is provided for application of biomass starch and bamboo fibers in the field of degradable plastics. In addition, starch wastewater is used as a raw material, so that the production cost can be reduced to a certain extent; the starch wastewater is used as process water of the bamboo fiber reinforced starch-based composite membrane, and the process can also counteract the treatment cost of the starch wastewater.

The invention relates to the field of earphone processing, and discloses a preparation process of an abnormal sound prevention ear hook of an ear clip type earphone and a product. A preparation process of an abnormal sound prevention ear hook of an ear clip type earphone comprises the following steps: S1, carrying out first injection molding encapsulation and shaping on an assembled earphone wire by using a first silica gel agent to prepare a shaped earphone wire; s2, carrying out injection molding and rubber coating on the shaped earphone wire rod by using a second silica gel agent, and vulcanizing to obtain an ear hook primary product; and S3, the primary ear hook product is subjected to polishing treatment and oil spraying treatment and then vulcanized, and the abnormal sound prevention ear hook is prepared. The abnormal sound prevention ear hook prepared by the preparation process has good flexibility and wear resistance, is applied to an ear clip type earphone, does not generate abnormal sound and unstable tone quality after being bent for multiple times, and has relatively good use stability.

The application discloses a kind of foam ceramic-based biofilm carrier and preparation method thereof, and the application is more excellent in dispersibility and compatibility by adding modified lithium bentonite and modified activated carbon, to promote the foam ceramic-based biofilm carrier with better quality, which can significantly increase the biological affinity of the system, help to improve the biofilm efficiency and quality, and after high-energy radiation, more active sites are generated on the surface, enhancing the interaction with silane coupling agent, thereby improving the degree of surface functionalization, with higher application stability;By adding a specific binder, it helps to form a more stable cross-linked structure, and synergistically acts with the reinforcing filler, making the application mechanical properties of the foam ceramic-based biofilm carrier more excellent, and overall, a foam ceramic-based biofilm carrier with better mechanical strength and biological affinity is obtained, which is applied to the treatment of sewage by biofilm method, with excellent biofilm rate, biofilm stability and adhesion, thereby making the sewage treatment effect more significant.