99 results about "Oxidised cellulose" patented technology

The invention relates to the technical field of rubber production, and discloses a micro-nano cellulose reinforcing filler, a preparation method thereof and a cellulose-rubber composite material. The preparation method of the micro-nano cellulose reinforcing filler comprises the following steps: carrying out oxidation treatment on cellulose to obtain modified cellulose with carboxyl functional groups; and carrying out transesterification on the modified cellulose and an unsaturated ester compound to obtain the micro-nano cellulose reinforcing filler. The method does not need traditional homogenization treatment, and is low in energy consumption and high in yield; the hydrogen bond acting force between cellulose molecules is reduced, the aggregation of the nano cellulose caused by hydrogen bonds can be effectively prevented, and the preparation process is simplified. The cellulose reinforcing filler prepared by the invention is a nanoscale cellulose sheet, and has high dispersity and good compatibility in polar rubber; high fraction filling can be realized, the thickness of an interface layer is improved, and external stress is effectively dissipated; the prepared cellulose-rubber composite material is low in compression temperature rise and rolling resistance and excellent in wet skid resistance.

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.

Provided is a carbon nanotube dispersion liquid having excellent dispersibility. A carbon nanotube dispersion liquid, which contains at least carbon nanotubes, oxidized cellulose nanofibers, and water, and which is characterized in that the oxidized cellulose nanofibers having a fiber length of 50-250 nm account for 85% or more of the oxidized cellulose nanofibers.

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 slow release fertilizers, and provides a preparation method of a layer-by-layer assembled bio-based polyelectrolyte coated slow release fertilizer. The layer-by-layer assembled bio-based polyelectrolyte coated slow-release fertilizer comprises a fertilizer core and at least one layer of coating, the fertilizer core sequentially comprises a fertilizer and a tannin extract layer from inside to outside; the coating film sequentially comprises a cationic polyelectrolyte layer and a TEMPO oxidized cellulose nanofiber layer from inside to outside. Through the technical scheme, the problems of poor water resistance and poor slow release performance of the bio-based polyelectrolyte coated slow release fertilizer in related technologies are solved.

The invention discloses modified nanocellulose aerogel as well as a preparation method and application thereof. The modified nanocellulose aerogel is formed by raw materials including a polymer shown in the formula (1) and oxidized cellulose nanofibers, the mass ratio of the polymer shown in the formula (1) to the oxidized cellulose nanofibers is defined as m, and mlt is 1 < = mlt; 10; in formula (1), n is a natural number of 70-105, and Me is a methyl group. The modified nanocellulose aerogel can be used for oil-water separation, and has good oil adsorption performance, good flame retardant performance and good heat insulation performance. # imgabs0 #

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.

The invention provides cellulose nanofiber lithium as well as a preparation method and application thereof, and the preparation method comprises the following steps: step 1, preparation of cellulose nanofiber: oxidizing cellulose by adopting 2, 2, 6, 6-tetramethyl piperidine oxide (TEMPO) and carrying out ultrasonic treatment, so that micron-sized cellulose is stripped into single dispersed cellulose nanofiber (TOCNF), and the single dispersed cellulose nanofiber (TOCNF) is obtained; functional carboxyl groups (-COOH) are introduced into the surface of the polymer; and step 2, preparation of cellulose nanofiber lithium: attaching lithium ions to the cellulose nanofiber through ion exchange to obtain the cellulose nanofiber lithium. The prepared cellulose nanofiber lithium (TOCNF-Li) binder has the characteristic of spontaneously forming a network in the freeze-drying process, can provide good mechanical support for a positive electrode material and a conductive agent, and improves the mechanical strength while meeting the flexibility. By forming an intercommunicated conductive network structure, transmission of electrons and ions in the positive plate is facilitated, and a high-performance electrode with high mass load and good flexibility can be realized.

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.

A non-aqueous gel writing ink having an organic solvent, a coloring agent and a gelling agent, and the gelling agent is non-oxidized cellulose nanofibers. In some embodiments, the non-oxidized cellulose nanofibers are non-etherified. In yet another embodiment, the non-oxidized cellulose nanofibers are water insoluble. In yet another embodiment, the non-aqueous gel writing ink is used in a writing instrument. The non-aqueous gel writing ink presenting no static leakage and no settlement and the low viscosity under shear enables good writing smoothness, in particular without line breakage.

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 present invention relates to a hemostatic absorbable composition, comprising: a flowable plurality of separate aggregates each comprising: a plurality of absorbable carrier particles coated on a surface thereof by a plurality of smaller particles comprising an absorbable supplemental hemostasis-promoting agent. In some embodiments, the absorbable carrier particles comprise gelatin or collagen, and the supplemental hemostasis-promoting agent comprises oxidized cellulose, oxidized regenerated cellulose, carboxylic oxidized cellulose, carboxylic oxidized regenerated cellulose, thrombin, or tranexamic acid.

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.