54 results about "Oxidised cellulose" patented technology

The application discloses a degradable cotton soft towel and a preparation method thereof, relates to the technical field of fiber composite materials, and belongs to the patent classification D01F8 / 02. The preparation method comprises the following steps: performing alkali treatment and enzymolysis on Egyptian long-staple cotton fibers to obtain pretreated cotton fibers, and preheating, stretching and setting poly-caprolactone fibers to obtain pretreated poly-caprolactone fibers; mixing and opening the two kinds of fibers, and then air-laying to form a fiber web; constructing a super water-absorbing network by impregnating a main network solution carboxymethyl chitin and oxidized cellulose nanofilament and an auxiliary network dispersion liquid calcium alginate gel microspheres and a hyaluronic acid crosslinking body; forming micron protrusions through hexagonal nickel template hot pressing, and obtaining a base by electrostatic spraying modification of nano silicon dioxide; and obtaining the cotton soft towel through vacuum drying, slitting and sterilization after spraying of an essence liquid. The cotton soft towel has excellent water absorption performance through the synergistic effect of multistage pores, a super water-absorbing network and micro-nano surface modification, and the poly-caprolactone fibers and the cotton fibers used in the cotton soft towel are mixed, and both have good biodegradability.

The invention belongs to the technical field of flame retardants, and particularly relates to a melamine hydrobromide flame retardant and a preparation method thereof. The flame retardant disclosed by the invention has a core-shell structure, the core is hydroxylated melamine hydrobromide subjected to surface modification by a silane coupling agent, and the shell is melamine resin synergistically enhanced by ammonium polyphosphate and oxidized cellulose nanofibrils; through silanization treatment, core-shell interface combination is enhanced, and space-time synergy of gas phase and condensed phase flame retardance is achieved through a composite shell; the obtained flame retardant is high in thermal stability in a polymer matrix, the limit oxygen index of a composite material can be remarkably increased after the flame retardant is added, and the flame retardant has a wide application prospect in the field of flame retardance of high polymer materials through a UL-94 V-0 grade test.

The invention relates to the technical field of flexible energy storage materials, in particular to a bamboo-based composite polypyrrole flexible membrane electrode material and a preparation method thereof.The preparation method comprises the steps that TEMPO oxidized cellulose nanofibers or UMCNF mechanically ground cellulose nanofibers are stirred and mixed with deionized water, and suspension liquid with the mass fraction of 0.2%-1% is prepared; carrying out vacuum filtration on the suspension by adopting a 0.22-0.45 mu m filter membrane to form a uniform wet membrane, freeze-drying the wet membrane to constant weight, and then carrying out die casting at room temperature by adopting a hot press to obtain a bamboo nanofiber flexible membrane; the method comprises the following steps: dissolving ferric trichloride hexahydrate in deionized water at room temperature to obtain an oxidant solution; mixing pyrrole, the bamboo nanofiber flexible membrane and an oxidizing agent solution according to a ratio, stirring, standing, freezing and carrying out in-situ polymerization to obtain a polymerization reaction solution; carrying out suction filtration on the polymerization reaction solution by adopting a 0.22-0.45 mu m filter membrane to obtain a membrane material, freeze-drying the membrane material to constant weight, and carrying out die casting by adopting a hot press to obtain the electrode material, and the material obtained by the method is good in electrical property and good in mechanical strength.

The invention belongs to the technical field of adsorption, and particularly relates to an amino acid modified coal gangue-oxidized cellulose based hydrogel adsorption material as well as a preparation method and application thereof. The preparation method comprises the following steps: grinding coal gangue, treating the ground coal gangue with an organic acid, oxidizing the treated coal gangue with an oxidant, and adding an amino acid modifier to fully react with a catalyst to prepare sulfydryl modified coal gangue; swelling the cellulose, and adjusting the pH value of the solution to be neutral; adding an oxidizing agent, stirring in a dark constant-temperature water bath, centrifugally washing, and drying to obtain hydroformylated cellulose; the preparation method comprises the following steps: mixing aldehyde cellulose, N, N-dimethylacrylamide, methacrylic acid sulfobetaine and sulfydryl modified coal gangue, polymerizing at 70-75 DEG C under the action of a cross-linking agent and an initiator, and freeze-drying to obtain the cellulose-coal gangue composite hydrogel adsorption material. The problems that an existing cellulose-based hydrogel adsorption material is single in function, poor in stability and weak in mechanical performance are solved.

A carbon nanotube dispersion may have excellent dispersibility. Such a carbon nanotube dispersion may include at least carbon nanotubes, oxidized cellulose nanofibers, and water, wherein, of the oxidized cellulose nanofibers, 85% or more of the oxidized cellulose nanofibers have a fiber length of 50 nm to 250 nm.

The invention belongs to the field of fine chemical engineering and special chemicals, and particularly relates to a preparation method of modified cellulose microgel. The preparation method comprises the following steps: (1) mixing bacterial cellulose, TEMPO, sodium dihydrogen phosphate, sodium hypochlorite, sodium chlorite and water to obtain a mixture; (2) sealing the mixture at the room temperature of 25 DEG C, stirring and reacting for 4 hours, and then stirring and reacting for 48 hours at the temperature of 65 DEG C; (3) cooling the product obtained in the step (2) to room temperature to obtain TEMPO oxidized cellulose, and performing high-speed shearing on the TEMPO oxidized cellulose to obtain cellulose microgel; and (4) carrying out hydrophobic modification on the cellulose microgel to obtain the modified cellulose microgel. According to the preparation method, the bacterial cellulose is used as a raw material, and after the bacterial cellulose is subjected to hydrophobic modification, the surface hydrophobicity is improved while good suspension property and pore structure are maintained, so that the storage of the bacterial cellulose microgel in water and the capability of adsorbing volatile material fragrance are realized.

The invention provides a preparation method of a thermosensitive phase change material. The method comprises the following steps: preparing oxidized cellulose powder, oxidized nanocellulose redispersion liquid, oxidized nanocellulose redispersion dissolving liquid, spherical oxidized-regenerated nanocellulose and the thermosensitive phase change material. The invention further provides application, the spherical oxidized-regenerated nanocellulose is applied to packaging of a phase-change material, and the thermosensitive phase-change material can be applied to temperature change indication and adjustment. The problem that the oxidized cellulose dispersion liquid is difficult to store for a long time in the transportation and storage process is solved. According to the method disclosed by the invention, the fibrous oxidized nano-cellulose is dried and re-dispersed, so that the spherical oxidized-regenerated nano-cellulose which is uniform in particle size distribution, relatively small in size and good in dispersity can be prepared without loss. In addition, the thermosensitive phase change material with the spherical oxidized-regenerated nanocellulose as the shell layer is prepared on the basis, and the application of the nanocellulose is expanded.

This invention relates to the field of sensing materials technology, specifically disclosing a cellulose-based conductive hydrogel material for ascorbic acid detection, its preparation method, and its applications. This hydrogel uses TEMPO oxidized cellulose nanofibers (TOCNF) as a biocompatible matrix. By introducing Cu-BTC / CNT composite nanoparticles, a three-dimensional conductive network with both high electrochemical activity and structural stability is constructed. While retaining the biocompatibility and flexibility of cellulose, it exhibits particularly high sensitivity and selectivity in detecting small biomolecules such as ascorbic acid, with short response time and good stability. This method achieves synergistic optimization of the composite material's structural uniformity and functionality without relying on complex molding processes. Experimental results show that the conductive hydrogel prepared by this invention possesses good mechanical properties and biocompatibility, exhibiting high sensitivity and stability in biosensing fields such as ascorbic acid detection, providing a novel high-performance material basis for flexible biosensors.

The method comprises the following steps: step 1, etching an Al layer in a Ti2AlC3 MAX phase by using a LiF / HCl system, so as to obtain an Mxene colloidal solution; 2, the TEMPO-oxidized cellulose nanofibril CNF dispersion liquid, the Mxene colloidal solution, calcium lignosulphonate and ferric acetate are sequentially mixed, stirred and subjected to ultrasonic treatment till a uniform mixed suspension is formed, then freeze drying is conducted, and MXene-based lignocellulose aerogel loaded with metal ions is obtained; 3, the MXene-based lignocellulose aerogel loaded with the metal ions is subjected to high-temperature carbonization treatment in inert gas, and the MXene-based lignocellulose derived carbon aerogel wave-absorbing material loaded with the metal nanoparticles is obtained. Multiple scattering of electromagnetic waves is effectively promoted, a rich heterogeneous interface is formed, and the synergistic effect of a dielectric-magnetic loss mechanism is further achieved through introduction of the magnetic metal. Therefore, the problems of poor impedance matching, single component and the like in the preparation process of the wave-absorbing material are solved.

The present invention provides a hemostatic composite sponge comprising oxidized cellulose and an essentially gelatin-free bioadhesive material stably associated with said sponge and present in an organized pattern on said sponge.

To provide oxidized cellulose excellent in defibration.SOLUTION: The oxidized cellulose is oxidized cellulose which is an oxide of a cellulose-based raw material by a hypochlorous acid or a salt thereof, and substantially contains no N-oxyl compound, wherein the degree of polymerization is 600 or less.SELECTED DRAWING: None

The present invention relates to a haemostasis device for surgical procedures, characterised in that it comprises a spherical structure having three main structures: the first structure is an instrument (1) for pulling or recovering the device, and that is actuated once the device has been used in the surgical procedure; the second structure (2) is a releasable layer of oxidised cellulose that is in turn attached to the pull structure (1); and the third structure is a sterile cotton core (3), with controlled expansion, which is also attached to the pull structure (1). The pull structure (1) is able to remove the third structure (3) from a surgical cavity without removing the second structure (2).

The present application relates to the technical field of multilayer composite fabric, in particular to a waterproof and antibacterial polyester multilayer composite fabric and a preparation process thereof.The waterproof and antibacterial polyester multilayer composite fabric comprises a core layer fabric and a waterproof and antibacterial fiber layer on the front and back surfaces of the core layer fabric.In the present application, alkaloids in bamboo culms are separated, combined with polyamide amine PAMAM-G3-NH2 through a reaction to obtain a PAMAM-alkaloid compound, and then combined with vanillin amine hydrochloride and bamboo cellulose nanocrystal through a Schiff base reaction, which significantly improves the bonding strength of natural alkaloids and the fiber base, and the prepared composite antibacterial agent is spun together with a polyurethane polymer solution, so that the composite antibacterial agent can be uniformly dispersed and stably embedded in the waterproof and antibacterial fiber layer, thereby effectively avoiding the shedding of the antibacterial components in the daily rubbing, folding and repeated washing processes, and ensuring the stability of the long-acting antibacterial performance.

The invention discloses a TEMPO-based oxidation modified hard carbon paper negative electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out TEMPO oxidation pretreatment on cellulose paper pulp, and molding the obtained oxidized cellulose into raw paper through a wet papermaking process; and performing high-temperature carbonization treatment on the raw paper in a protective atmosphere to obtain the hard carbon paper negative electrode material. The obtained hard carbon paper negative electrode forms rich nanoscale sodium storage active sites after being carbonized, the platform capacity proportion is successfully increased to about 80%, the sodium storage characteristic close to the whole platform is achieved, and the energy density of the sodium ion battery is remarkably improved. In addition, the platform capacity of 250.1 mAh / g can still be achieved under the ultrahigh loading capacity (13.3 mg / cm < 2 >). Meanwhile, the integrated electrode structure does not need an additional current collector, an adhesive and a conductive agent, and shows excellent electrochemical performance and industrial application potential.

The invention provides soluble polysaccharide monooxygenase as well as a coding gene and application thereof, the amino acid sequence of the soluble polysaccharide monooxygenase is as shown in a sequence table SEQ ID NO.1, heterologous expression is realized in pichia pastoris, the soluble polysaccharide monooxygenase after heterologous expression can oxidize a cellulose substrate, and the soluble polysaccharide monooxygenase can be used for producing a cellulose substrate. And the hydrolysis efficiency of the cellulase on a cellulose substrate is improved. According to the present invention, the polysaccharide cleavage monooxygenase derived from the Autobasidium pullulans and the cellulase are mixed for use, and co-act to catalyze and degrade the cellulose substrate to produce the glucose, such that the degradation requirement of the cellulose substrate is easily achieved, the degradation activity of the cellulose substrate is improved, and the foundation is established for the efficient degradation of the cellulose substrate.

The invention provides a saline-alkali soil conditioner and a preparation method thereof. The preparation method comprises the following steps: S1, preparing polystyrene microspheres coated with polyethyleneimine; s2, preparing attapulgite of which the surface is grafted with TEMPO oxidized cellulose, and then carbonizing the attapulgite to obtain a carbon-coated attapulgite composite material; s3, preparing composite aerogel; s4, bacillus pasteurii and azotobacter chroococcum are loaded on the composite aerogel, and the saline-alkali soil conditioner is obtained. The double strains are loaded on the composite aerogel, controlled release and slow release of the strains are achieved, in addition, the two microbial agents serve as dominant flora, breeding of harmful pathogens in soil can be inhibited, soil micro-ecological balance can be adjusted, and a healthy rhizosphere environment is created for follow-up crop planting.

The application discloses a papermaking retention and drainage aid containing cellulose nanofibrils and hydrophobic cellulose fibers, which comprises the following components: i, cellulose polymethyl acrylate glycidyl ester grafted fibers (CPGMAs); ii, a combination of cationic polyacrylamide (CPAM), 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) oxidized cellulose nanofibrils (TOCNs) and anionic polyacrylamide (APAM). The application provides a new quaternary composite system: forming a CPGMas@CPAM / TOCNs / APAM system, which comprehensively improves the drainage rate, filler retention rate and paper strength.

The application provides a water-based thermal expansion microsphere sound insulation coating and a preparation method thereof, and comprises the following components: hydroxyethyl cellulose, thermal expansion microspheres, sepiolite fibers, natural cellulose fibers, modified perlite, a flame retardant, snow white, an elastic polymer emulsion, an additive, and a solvent; wherein the modified perlite is epoxy silane coupling agent, polyethylene imine and oxidized cellulose modified perlite. The modified perlite is used as a coating component, effectively increases the interface bonding effect between various components in the emulsion, prevents the particle components in the coating from falling off, simultaneously plays the light weight and sound absorption functions, the sound insulation effect is significantly enhanced, a sound absorption network can be formed, and the comprehensive performance of the product, such as sound insulation, waterproof alkali resistance, adhesion and combustion, is improved.

The invention belongs to the technical field of nano materials, and particularly relates to an antioxidant material and application thereof. The antioxidant material takes carboxylated cellulose or a nano-cellulose composite material obtained by coating the carboxylated cellulose with cerium as an active ingredient; the carboxylated cellulose is obtained by oxidizing cellulose through a TEMPO method, and CeNPs are uniformly coated on the fiber surface of TO-CNF through an in-situ synthesis method, so that agglomeration of CeNPs in a physiological environment can be effectively prevented, the physiological stability and biocompatibility of CeNPs are remarkably improved, and the long-lasting and stable exertion of the antioxidant effect of CeNPs is ensured.

A carbon nanotube dispersion may have excellent dispersibility. Such a carbon nanotube dispersion may include at least carbon nanotubes, oxidized cellulose nanofibers, and water, wherein, of the oxidized cellulose nanofibers, 85% or more of the oxidized cellulose nanofibers have a fiber length in a range of from 50 to 250 nm.

The invention discloses a preparation method of anthocyanin-loaded oxidized nanocellulose / chitosan elastic composite aerogel, which comprises the following steps: mixing and stirring oxidized nanocellulose dispersion liquid and chitosan solution, adjusting the pH value, adding epichlorohydrin for primary crosslinking, dialyzing to remove redundant unreacted epichlorohydrin, and freeze-drying to obtain the anthocyanin-loaded oxidized nanocellulose / chitosan elastic composite aerogel. The preparation method comprises the following steps: taking oxidized nanocellulose as a raw material, adding chitosan into the oxidized nanocellulose solution, soaking with a silane coupling agent KH570 solution, carrying out secondary crosslinking, drying, putting into an anthocyanin solution, soaking, carrying out anthocyanin loading, and freeze-drying to obtain the anthocyanin-loaded oxidized nanocellulose / chitosan elastic composite aerogel. The composite aerogel prepared by the invention has good mechanical stability and rebound resilience, can be repeatedly extruded, has good water absorption, and has antibacterial property after loading anthocyanin.

The invention relates to a method for improving the emulsibility of soybean protein isolate by synergism of alkaline pH shift and oxidized cellulose nanocrystals, and belongs to the technical field of protein modification. The method comprises the following steps: (1) preparing a soybean protein isolate (SPI) solution; (2) preparing an alkaline pH shift soybean protein isolate (MSPI) solution; (3) preparation of oxidized cellulose nanocrystals (DCNC); and (4) preparing the SPI / MSPI-DCNC compound. The SPI is modified through the synergistic effect of alkaline pH shift and oxidized cellulose nanocrystals, the emulsibility of the SPI is greatly improved, and the method has very important significance for expanding the application field of the SPI.

The invention discloses anisotropic aerogel based on silver nanowires and a preparation method and application thereof.The preparation method comprises the following steps that silver nanowire dispersion liquid, MXene aqueous dispersion liquid and TEMPO oxidized cellulose nanofiber aqueous dispersion liquid are mixed according to the solid content ratio of (0.025-0.25): (0.025-0.25): (0.5-0.95), and mixed liquid is obtained; violently stirring the mixed solution for a set time to obtain a mixed gel precursor; pouring the mixed gel precursor into a mold, and performing one-way freezing in a low-temperature refrigerator or a liquid nitrogen bath until the mixed gel precursor is completely solidified; the solidified gel is dried, moisture is removed, and aerogel is obtained; and carrying out hydrophobic treatment on the aerogel to obtain the aerogel. High mechanical strength, excellent environmental stability and broadband electromagnetic shielding performance are realized through a controllable preparation process.

The invention discloses a flame-retardant noctilucent glass fiber reinforced plastic grating plate which is prepared from the following components in parts by mass: 80 to 100 parts of base resin, 60 to 70 parts of glass fiber, 10 to 20 parts of noctilucent powder, 5 to 15 parts of carbon nanotube grafted aramid fiber, 3 to 8 parts of oxidized cellulose nanofiber, 20 to 30 parts of aromatic amine curing agent, 10 to 20 parts of flame retardant and 5 to 10 parts of dodecaphenyl polyhedral oligomeric silsesquioxane. The base resin comprises bisphenol A epoxy resin and novolac epoxy resin, and the noctilucent glass fiber reinforced plastic grating plate prepared from the components has excellent flame retardance, bending resistance and heat resistance.

This invention relates to a method for the efficient cationization of cellulose fibers, belonging to the field of textile printing and dyeing. The method includes the following steps: S1, oxidizing cellulose fibers using a TEMPO / NaClO / NaBr oxidation solution to obtain oxidized cellulose fibers; S2, cationizing the oxidized cellulose fibers obtained in step S1 using an alkaline cationization solution containing an epoxy quaternary ammonium salt to obtain oxidized-cationized cellulose fibers. Compared to traditional methods relying on hydroxyl reactions, this invention, by pre-introducing highly active carboxyl sites, allows for reaction with cation reagents containing epoxy groups under milder conditions, reducing raw material loss due to epoxy group hydrolysis and achieving efficient and low-consumption cationization modification. This method can effectively improve dye utilization, reduce dye usage, and achieve more efficient salt-free dyeing.

The invention belongs to the field of civil engineering materials, and particularly relates to a road composite biomass fiber with high weather resistance and a preparation method of the road composite biomass fiber. Two functional compounds including an epoxidized lignin-polyurethane prepolymer and a nanocellulose-silicon dioxide core-shell hybrid material are introduced, caprolactam, polyethylene glycol and a citric acid cross-linking agent are matched, and the composite material is prepared through a specific process. The preparation method comprises the following steps: mixing the components in an alkaline solution to form a suspension, adjusting the pH value, and carrying out pre-crosslinking to obtain a colloidal mixture; a nascent fiber is formed through wet spinning, and room-temperature pre-stretching, two-stage hot stretching and high-temperature heat treatment are sequentially carried out. The composite biomass fiber prepared by the method shows excellent mechanical strength, ultraviolet aging resistance, humidity and heat resistance and thermal stability, and is suitable for enhancement and modification of various asphalt pavements.

The invention relates to the technical field of heating cigarettes, in particular to cigarette core particles, a preparation method thereof and a heating cigarette. The preparation method of the cigarette core particles comprises the following steps: adding water into the components of the raw materials, and mixing to form a cigarette puff; the raw materials comprise smoke powder, a smoke agent and TEMPO oxidized cellulose nanofibers; the TEMPO oxidized cellulose nanofiber is prepared by taking cellulose nanofibrils as a raw material through a TEMPO oxidation method; and granulating the puff to obtain cigarette core particles. The cigarette core particle is excellent in mechanical property, and the problems of raw material loss and production interruption caused by loose structure and insufficient compactness of the existing cigarette core particle are solved. The mixing and granulating process adopted in the preparation method is good in compatibility with an existing cigarette core particle production line, complex transformation is not needed, and the production cost can be reduced.

The invention relates to a preparation method of nanocellulose, which comprises the following steps: grinding and screening microcrystalline cellulose, collecting and screening the microcrystalline cellulose, then adding the microcrystalline cellulose into an acetic acid-sodium acetate buffer solution for sterilization, after sterilization is completed, adding endo-cellulase for enzymolysis, and after enzymolysis is completed, inactivating the endo-cellulase to obtain the nanocellulose. After inactivation, centrifugally washing to obtain enzymolysis cellulose; 2, 2, 6, 6-tetramethylpiperidine-1-oxygen free radical oxidation modification is carried out on the cellulose subjected to enzymolysis, and oxidized cellulose is obtained; carrying out high-speed shearing emulsification on the oxidized cellulose to obtain emulsified cellulose; adding the emulsified cellulose into an aqueous solution of a deep-eutectic solvent DES formed by choline chloride and urea to swell the emulsified cellulose, performing high-pressure homogenization, and performing freeze drying after the high-pressure homogenization is completed to obtain the nano cellulose. According to the method, the size uniformity and dispersity of the nanoscale cellulose can be remarkably improved, and the size of the cellulose can be remarkably reduced.

A pesticidal composition includes a pesticidal active ingredient, nitro-oxidized cellulose fibers, and water. The nitro-oxidized cellulose fibers have a carboxylate content between about 0.8 mmol / g and about 3.0 mmol / g, and the pesticidal composition can be deployed through an agricultural spray nozzle under typical operating conditions.