73 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 present invention relates to compressed hemostatic tablets or forms comprising a fibrous nonwoven oxidized cellulose (OC or ORC) multilayer material compressed into a shape-stable tablet, further comprising a calcium salt, and capable of rapidly expanding upon contact with blood or plasma. The compressed forms may further comprise multi-arm PEG-SG and are dimensionally stable, preferably in terms of length and width, for at least 48 hours after compression. In some embodiments, upon contact with blood, the compressed forms expand to 1.5 to 5 times their tablet length in 5 seconds, to 2 to 6 times their tablet length in 20 seconds, and to 3 to 6 times their tablet length in 5 minutes. The compressed forms are effective for hemostasis in heparinized blood.

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.

The invention discloses a sulfur-loaded nitrogen coordination metal cobalt / graded porous carbon composite electrode material and a preparation method and application thereof, and belongs to the technical field of preparation methods of lithium-sulfur battery electrode materials, the method comprises the following steps: respectively dissolving cobalt nitrate hexahydrate, zinc nitrate hexahydrate and adenine in N, N-dimethylformamide, then uniformly mixing and stirring, and drying to obtain the sulfur-loaded nitrogen coordination metal cobalt / graded porous carbon composite electrode material. Carrying out hydrothermal reaction, centrifugal separation, washing and freeze drying to obtain a cobalt / zinc-adenine complex; the preparation method comprises the following steps: dissolving cobalt oxide in deionized water, sequentially dispersing the cobalt oxide and oxidized cellulose nanofibers in deionized water, fully stirring to form hydrogel, carrying out freeze drying treatment and calcination treatment, mixing with elemental sulfur, and carrying out heat treatment to obtain the sulfur-loaded nitrogen coordinated metal cobalt / graded porous carbon composite electrode material. Nitrogen coordination cobalt cooperates with graded porous carbon to inhibit shuttling of polysulfide, catalytic conversion is enhanced, and the cycle life of the lithium-sulfur battery is prolonged.

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 invention discloses a dual-network synergistically reinforced composite aerogel material and a preparation method thereof, and belongs to the technical field of composite materials. The preparation method comprises the following steps: firstly, carrying out polyethyleneimine modification on TEMPO oxidized cellulose, then carrying out cross-linking interpenetration on the modified TEMPO oxidized cellulose and chitosan to form a TOCNF / CS double-network aerogel substrate, then growing UiO-66-NH2 nanoparticles on the TOCNF / CS double-network aerogel substrate in situ, and finally, fully cleaning and freeze-drying to obtain the double-network synergistic enhanced TOCNF / CS UiO-66-NH2 composite aerogel. According to the system, the intermolecular acting force is utilized to enhance the network stability, the mechanical resilience and the structural durability in a wet environment are improved, the defects of a traditional adsorption material in the aspects of mechanical property and cycling stability are greatly relieved, and a solution with efficient adsorption and engineering adaptability is provided for complex wastewater, waste oil and waste gas treatment.

The invention discloses a retention and drainage aid containing cellulose nanofibrils and hydrophobic cellulose fibers for papermaking. The retention and drainage aid for papermaking comprises the following components: i, cellulose polyglycidyl methacrylate grafted fibers (CPGMAs); ii, a combination of a cationic polyacrylamide (CPAM), a 2, 2, 6, 6-tetramethylpiperidine-1-oxygen radical (TEMPO) oxidized cellulose nanofibrils (TOCNs), and an anionic polyacrylamide (APAM). The invention provides a novel quaternary compound system: a CPGMAs (at) CPAM / TOCNs / APAM system is formed, and the water filtering rate, the filler retention rate and the paper strength are comprehensively improved.

To provide a method for producing a composite material and a composite material in which water absorption property can be reduced without hydrophobing nano-cellulose.SOLUTION: A method for producing a composite material according to the present invention includes: a step of mixing rubber latex containing a rubber component, oxidized cellulose and / or nano-cellulose, and unsaturated carboxylic acid salt containing at least any one of aluminum ion, zinc ion and iron ion to obtain a first mixture; a step (S40) of performing ion exchange of the first mixture to obtain a second mixture; a step (S50) of heating the second mixture and reducing moisture content to obtain a third mixture; and a step (S60) of kneading the third mixture to obtain a composite material. The oxidized cellulose and nano-cellulose are derived from an oxide of cellulose-based raw material by hypochlorous acid or a salt thereof, and are not derived from an oxide of cellulose-based raw material by N-oxyl compound.SELECTED DRAWING: Figure 1

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 invention discloses a preparation method of bagasse cellulose grease gel. The preparation method comprises the following steps: S1, extracting bagasse cellulose by using sodium chloride; s2, adding a sodium hypochlorite solution, TEMPO and sodium bromide to prepare TEMPO oxidized cellulose; s3, adding vegetable oil to prepare a TEMPO oxidized cellulose emulsion; and S4, performing freeze-drying on the emulsion obtained in S3, and performing mechanical shearing to obtain the grease gel. According to the bagasse cellulose grease gel prepared by the method, bagasse-derived holographic cellulose is adopted as a raw material, and the grease gel is prepared by adopting an emulsion template method after TEMPO oxidation. The bagasse cellulose grease gel provided by the invention provides a new choice of grease gels while promoting efficient utilization of waste resources.

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 discloses adsorption type paper as well as a preparation method and application thereof. The adsorption type paper comprises oxidized cellulose, nano cellulose, zeolite powder, calcium salt, polyethylene glycol and chitosan, and the preparation method comprises the following steps: 1) preparing the zeolite powder, the calcium salt and the polyethylene glycol into slurry A, and preparing the oxidized cellulose and the nano cellulose into slurry B; 2) uniformly mixing the slurry A and the slurry B to obtain slurry C; and 3) dissolving chitosan in an acetic acid solution, adding the solution into the slurry C, uniformly mixing, and carrying out papermaking and molding. The adsorption type paper has the advantages of being high in adsorption efficiency, excellent in mechanical performance, uniform in pore structure, good in air permeability and the like, can effectively adsorb peculiar smell molecules emitted by durian when serving as a packaging material, can effectively avoid ripening deterioration of the durian in the transportation process, and is suitable for air transportation of the durian.

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 relates to the technical field of biomedical materials, and discloses a hydrogel composite porous zinc scaffold as well as a preparation method and application thereof. The preparation method comprises the following steps: providing a porous zinc scaffold and a hydrogel prepolymerization solution containing TEMPO oxidized cellulose nanofibers and polyvinyl alcohol; infiltrating a porous zinc scaffold into the hydrogel prepolymerization liquid to obtain a porous zinc scaffold infiltrated with the hydrogel prepolymerization liquid; and repeatedly freezing and thawing the porous zinc scaffold infiltrated with the hydrogel prepolymerization liquid for 2-5 times, and drying to obtain the hydrogel composite porous zinc scaffold. Carboxyl in the TEMPO oxidized cellulose nanofiber can be effectively combined with metal cations, and the hydrogel composite porous zinc scaffold with extracellular matrix, controllable degradation and bone induction activity can be prepared after the TEMPO oxidized cellulose nanofiber is compounded with the porous zinc scaffold. The hydrogel composite porous zinc scaffold can slowly release zinc ions, slow down inflammatory response and promote osteogenic differentiation, and is suitable for bone defect repair of thighbones, jaw bones and the like.

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.