20 results about "Dialdehyde cellulose" patented technology

The invention relates to the technical field of phenolic resin, in particular to dialdehyde cellulose-based phenolic resin and a preparation method thereof. The dialdehyde cellulose-based phenolic resin is prepared from dialdehyde cellulose, phenol, formaldehyde and a basic catalyst. According to the invention, the dialdehyde cellulose prepared from renewable biomass resource cellulose is used for replacing part of formaldehyde to prepare the dialdehyde cellulose-based phenolic resin, so that the use amount of formaldehyde can be reduced by 20%, and the production cost and material toxicity of the phenolic resin are reduced. Meanwhile, the dialdehyde cellulose-based phenolic resin prepared by the method disclosed by the invention has excellent bonding performance and thermal stability. Technical support is provided for solving the problems that biomass components are difficult to utilize, phenolic resin raw materials excessively depend on non-renewable resources, the bonding performance is not ideal and the like, and great application and popularization value is achieved.

The invention discloses a preparation method of a magnetic covalent immobilized enzyme carrier. The preparation method comprises the following steps: adding polyethyleneimine into a silicon-coated Fe3O4 microsphere dispersion liquid to obtain modified Fe3O4 microspheres; and dispersing the modified Fe3O4 microspheres in a solvent, adding dialdehyde cellulose, and reacting to obtain the magnetic covalent immobilized enzyme carrier. Amino groups of the modified Fe3O4 microspheres and aldehyde groups of dialdehyde cellulose can be subjected to condensation reaction to generate Schiff base groups, and the Schiff base groups and unreacted aldehyde groups, amino groups and other groups act together, so that enzyme is effectively fixed on the surface of a magnetic carrier. The preparation method of the magnetic covalent immobilized enzyme carrier is simple in process, easy in reaction control and operation and low in operation cost, and has the advantages of high enzyme loading capacity of the immobilized enzyme carrier, high biocompatibility, good dispersion effect, good stability, immobilized enzyme activity recovery and the like.

The invention provides a polyvinyl acetal adhesive and a preparation method and application thereof, and belongs to the technical field of high polymer materials, the polyvinyl acetal adhesive is prepared from an aldehyde compound and a polyvinyl alcohol aqueous solution through an aldolization reaction, and the aldehyde compound comprises dialdehyde cellulose and optionally further comprises formaldehyde. According to the invention, dialdehyde cellulose derived from natural cellulose is used as a green cross-linking agent, an environment-friendly adhesive system based on biomass is established, and formaldehyde harm is reduced or even eliminated. Performance test results show that the comprehensive performance of the adhesive is greatly improved while the purpose of removing formaldehyde is achieved.

The invention discloses a modified cellulose acetate dialysis membrane and a preparation method thereof.The preparation method comprises the following steps that after a cellulose acetate membrane is hydrolyzed for 1 min, the acetyl part of the cellulose acetate membrane is removed, then the cellulose acetate membrane with the acetyl part removed is subjected to an oxidation reaction, and the cellulose acetate membrane with the acetyl part removed is obtained; a selective oxidation catalyst A and / or a co-catalyst B are / is used in the oxidation reaction process, and an oxidant C is one of sodium hypochlorite, sodium chlorite, calcium hypochlorite, hydrogen peroxide, persulfate or sodium periodate; and then adding chitosan which is subjected to crosslinking modification by dialdehyde cellulose to carry out grafting reaction. According to the method, the grafting effect can be optimal only through the synergistic cooperation of the carboxyl active site amount and the crosslinking degree of the chitosan, and the urea adsorption capacity and the blood compatibility of the cellulose acetate membrane are remarkably improved.

The invention discloses a degradable puncture-resistant green packaging material and a preparation method thereof, belongs to the technical field of packaging material preparation, and aims to solve the technical problem that the degradation performance and puncture resistance of a packaging material in the prior art need to be further improved. Epoxy-modified degradable polyester carbonate is used as a continuous matrix, an aminated dialdehyde cellulose skeleton is introduced to construct an internal enhanced network, and a coating layer formed by a reaction type surface modification body is formed on the surface of the internal enhanced network, so that synergistic configuration of multiple components on a reaction path and a structure level is realized, and in the use process of the material, the material has good mechanical properties and good mechanical properties. The matrix, the reinforcement phase and the surface structure jointly participate in load transmission, interface stability and mass transfer regulation and control, and present a continuous and propelled structure evolution behavior under environmental conditions, so that the material forms coordinated and matched operation characteristics among mechanical bearing, barrier properties and biodegradation characteristics.

The application discloses a method for preparing nanocellulose based on guanidinium sulfamate low eutectic solvent, and belongs to the field of modified nanocellulose materials. Firstly, in a certain temperature, water is used as a reaction medium, sodium periodate is used as an oxidant, and lithium chloride is used as a catalyst to oxidize cellulose into dialdehyde cellulose DAC. Secondly, a guanidinium sulfamate-choline chloride binary eutectic solvent or a guanidinium sulfamate-glycerol binary eutectic solvent is configured, and then DAC is added into the two kinds of eutectic solvents respectively. DAC is swollen in the two kinds of eutectic solvents and reacts with guanidinium sulfonic acid groups to graft guanidinium sulfonic acid groups. In the process, the cellulose is swollen in the solvent and the surface charge density is increased, which promotes the subsequent ultrasonic nanocrystallization process, and the guanidinium sulfonic acid group nanocellulose with high transparency and good flame retardant effect is successfully prepared. The application has the advantages of simple operation, low cost, effective reduction of energy loss in the nanocrystallization process of fibers, good flame-retardant modification effect on nanocellulose, environmental friendliness of the used eutectic solvent, and facilitation of industrial production and application of the guanidinium sulfonic acid group nanocellulose and guanidinium sulfonic acid group nanocellulose membrane.

The application discloses a kind of preparation and application of 3D porous nanocellulose aerogel electret material for radioactive aerosol purification, comprising: preparation of dialdehyde cellulose nanofiber and preparation of ethyl cellulose nanofiber;Dialdehyde cellulose nanofiber is dispersed with ethyl cellulose nanofiber in tertiary butanol aqueous solution to form fiber suspension, and it is transferred to template, freeze-drying, and 3D porous nanocellulose aerogel is obtained;3D porous nanocellulose aerogel is heat treated in aniline steam, and modified 3D porous nanocellulose aerogel is obtained, then it is corona polarized, and 3D porous nanocellulose aerogel electret material is obtained.The 3D porous nanocellulose aerogel electret material of the application has certain electricity storage performance, the surface potential of electret nanofiber aerogel is tested, and the surface potential value is still higher than 0.27kV after 420min, and its dust capacity is good, purification performance is high, with good application prospect.

The invention belongs to the technical field of cellulose fibers, and particularly relates to a preparation method of antibacterial, mildew-proof and deodorant collagen cellulose fibers, which comprises the steps of preparation of a composite collagen assistant, preparation of a cellulose spinning stock solution, spinning and post-treatment. The preparation method comprises the following steps: firstly, carrying out selective oxidation on microcrystalline cellulose to obtain dialdehyde cellulose, and carrying out Schiff base reaction on amino on collagen and aldehyde on dialdehyde cellulose molecules to generate imine bonds; the rare earth ions interact with imine groups in the grafted protein, so that the prepared antibacterial, mildew-proof and deodorizing collagen cellulose fiber has high machining performance, also has the characteristics of antibacterial property, deodorization, mildew resistance, high wet modulus and the like, and is natural, degradable, safe and environment-friendly. Moreover, the collagen content in the collagen fiber prepared by the invention is as high as 30-40wt%, which is far beyond the protein content in the conventional collagen fiber.

The application discloses a kind of multiple network synergistic enhancement soy protein adhesive and its preparation method, belong to biological base adhesive technical field.The method with soy protein isolate (SPI) as main body, by pH induction realizes network's step-by-step construction: first by citric acid modified bentonite (CAB) and SPI between by hydrogen bond and metal coordination effect form first network;Then by dialdehyde cellulose (DAC) aldehyde group and SPI amino group occur Schiff base reaction and form covalent crosslinking second network;Finally, join the natural cinnamon aldehyde (CA) without chemical modification, by Schiff base reaction and Michael addition reaction form third crosslinking network, to build "hydrogen bond-coordination bond-covalent bond" multiple synergistic enhancement structure.DAC simultaneously as CAB nanosheet layer dispersion carrier and covalent crosslinking agent play dual function.The wet shear strength of the obtained adhesive is 1.31-1.56 MPa, the mildew-proof cycle is 26-32 days, the water absorption is less than or equal to 3.2%, and the residual rate is greater than or equal to 96.1%.The raw material of the application is green and environment-friendly, and the process is simple, without the need for pre-chemical modification of components, and can be widely applied in plywood and wood composite manufacturing field.

The application discloses a pH-induced photothermal enhancement type cellulose hydrogel and a preparation method and application thereof. The pH-induced photothermal enhancement type cellulose hydrogel is prepared by the following steps: preparing cellulose nanocrystals with pH / near-infrared light responsiveness by chemically grafting intrinsic state polyaniline on the surface of carboxylated cellulose nanocrystals, preparing pH-responsive drug-loaded cellulose nanocrystals by chemically modifying anti-inflammatory drugs on the surface of dialdehyde cellulose nanocrystals, and assembling the drug-loaded micelles formed by coating a carbon monoxide donor, manganese pentacarbonyl bromide, with a temperature-sensitive reagent, pluronic F68, into the pH-induced photothermal enhancement type cellulose hydrogel. The pH-induced photothermal enhancement type cellulose hydrogel has the pH-induced photothermal enhancement performance, can generate carbon monoxide under hydrogen peroxide stimulation, can controllably release anti-inflammatory drugs under pH stimulation, and can respond to sol-gel transition above 33 DEG C.

The invention relates to a sprayable gelatin / dialdehyde cellulose-based hydrogel loaded with bifidobacterium bifidum and application of the hydrogel in treatment of oral ulcer, and belongs to the technical field of biological medicines. The hydrogel disclosed by the invention consists of a gelatin solution and a bacterium-loaded dialdehyde cellulose solution which are respectively stored, are sequentially sprayed on an ulcer surface according to a volume ratio of 1: 1 during use, and are quickly gelatinized under the condition that the pH value is 8.5. By regulating and controlling the concentration and pH value of the gelatin and the dialdehyde cellulose, balance of rapid gelatinization and bacterial activity protection is realized, exogenous infection is avoided, the bifidobacterium bifidum hydrogel is suitable for irregular wounds, and the utilization efficiency and the treatment effect of bifidobacterium bifidum in oral ulcer treatment are remarkably improved.

The present application belongs to the technical field of pharmaceutical excipients, and particularly relates to a high-strength anti-oxygen hydroxypropyl methyl cellulose hollow capsule without gel agent, a preparation method thereof and application. The hollow capsule prepared by the present application contains, by mass percentage of dry solid components, 82.0-93.0 parts of hydroxypropyl methyl cellulose, 2.0-8.0 parts of dialdehyde cellulose nanocrystal, 1.0-4.0 parts of epsilon-polylysine and 2.0-6.0 parts of vitamin E polyethylene glycol succinate. In the capsule framework, the dialdehyde cellulose nanocrystal and epsilon-polylysine are cross-linked in situ to form an interpenetrating network of Schiff base, and the plasticizing and active oxygen scavenging dual effects of vitamin E polyethylene glycol succinate are combined, so that high mechanical strength, low moisture resistance, ultra-low oxygen permeability, rapid disintegration and high antioxidant performance are simultaneously achieved without any exogenous gel agent such as carrageenan, and the prepared hollow capsule is suitable for packaging of oxygen-sensitive drugs and probiotic preparations.

The application discloses a kind of minoxidil mixed solution and preparation method thereof, it is related to pharmaceutical preparation field.The application is prepared when minoxidil mixed solution, dialdehyde cellulose, minoxidil, diethylene triamine are reacted by emulsion method to obtain cellulose microspheres;Methyl bromide, iodomethane are reacted to obtain modified cellulose microspheres by cellulose microspheres;Octamethylcyclotetrasiloxane, tetramethylcyclotetrasiloxane are reacted to obtain polysiloxane;Polysiloxane, allyl polyether, chloroplatinic acid are reacted to obtain modified polysiloxane;Modified polysiloxane, modified cellulose microspheres, deionized water are uniformly mixed to obtain minoxidil mixed solution.The minoxidil mixed solution prepared by the application has good bacteriostasis, fat-soluble release, foam stability and low irritation.

The invention discloses Pickering emulsion based on dialdehyde cellulose nanofiber modified soybean protein isolate as well as a preparation method and application of the Pickering emulsion, and relates to the technical field of food science and bio-based functional materials. Reacting the carboxylated cellulose nanofiber aqueous dispersion with an oxidizing agent under a dark condition after the pH is adjusted, terminating through a terminating agent, and performing alcohol precipitation, washing and drying to obtain dialdehyde cellulose nanofibers; carrying out stirring, hydration and heat treatment on the soybean protein isolate aqueous solution after pH adjustment, and cooling to obtain a soybean protein isolate solution; dispersing the obtained dialdehyde cellulose nanofibers in water, and then mixing with a soybean protein isolate solution for reaction to form a composite particle dispersion liquid; the carvacrol is slowly added into the dispersion liquid, and a carvacrol loaded Pickering emulsion is constructed through dispersion treatment; the emulsion is applied to fruit surface film formation, can significantly inhibit the growth of pathogenic microorganisms, delays fruit spoilage, and improves the appearance quality in the storage period and the shelf life.

This invention discloses a method for preparing flame-retardant cotton fabric based on chemical grafting. The method involves grafting chloroacetic acid onto the hydroxyl groups at the C6 position of cellulose to generate carboxymethyl cellulose. Sodium periodate is then used to oxidize the hydroxyl groups at the C2 and C3 positions of cellulose to dialdehyde cellulose, which undergoes a Schiff base reaction with glutamic acid, introducing a large amount of -COO- groups. Finally, the carboxyl groups undergo a complexation reaction with calcium ions to form a flame-retardant cotton fabric with an egg-like "egg-box" structure. The flame-retardant properties are significantly improved, with a limiting oxygen index of 33.6%. The modified cotton fabric of this invention maintains good levels of hydrophilicity, strength, and whiteness.

The invention relates to a cellulose modified epoxy resin adhesive and a preparation method and application thereof.The preparation method comprises the following steps that S1, microcrystalline cellulose is subjected to oxidation treatment through an oxidizing agent, and dialdehyde cellulose A is obtained; s2, infiltrating and drying the dialdehyde cellulose A through first epoxy resin and a coupling agent to obtain dialdehyde cellulose B; s3, uniformly mixing the dialdehyde cellulose B, second epoxy resin, a curing agent and an accelerant to obtain the cellulose modified epoxy resin adhesive. The thixotropic index and the volume expansion rate of the resin are greatly improved through the reinforcing effect of the dialdehyde cellulose, the process is simple, and the cost is low.

The invention discloses a preparation method of polysaccharide-based functional hydrogel constructed based on multi-component reaction, and belongs to the field of biomedical materials. The method comprises the following steps: preparing dialdehyde cellulose, preparing a chitosan solution, preparing a dialdehyde cellulose-anthocyanin solution and finally forming the hydrogel. Cellulose is oxidized by sodium periodate to prepare dialdehyde cellulose, and the dialdehyde cellulose, a chitosan solution and anthocyanin are subjected to multi-component reaction under mild conditions to form a covalent cross-linked network in situ. According to the invention, the use of toxic chemical cross-linking agents is avoided, the process is simple, the conditions are mild, and the prepared hydrogel has injectability, self-healing property, good swelling property and excellent antibacterial and antioxidant activity and blood compatibility, and is suitable for the biomedical fields of wound dressing, drug delivery and the like.

The invention discloses an acidizing corrosion inhibitor for an oil and gas field and a preparation method of the acidizing corrosion inhibitor, and belongs to the technical field of CO2 oil displacement corrosion inhibition. The corrosion inhibitor comprises the following components: a cellulose-based imidazoline copolymer, tween-80, hexynol and a solvent consisting of water, ethanol and isopropanol. Dialdehyde cellulose is prepared through sodium periodate oxidation, oleic acid imidazoline prepared from oleic acid and tetraethylenepentamine is grafted into a cellulose molecular chain through Schiff base reaction, phosphoric acid esterification modification of hydroxyl at the C6 position of cellulose is achieved through phosphorus trichloride steam bath, the Schiff base reaction is utilized again, and the hydroxyl at the C6 position of cellulose is obtained. Grafting a terminal tertiary amino group to a dialdehyde cellulose molecular chain, and quaternizing through methyl iodide to obtain quaternary ammonium salt; three functional groups are connected to a cellulose molecular chain through chemical bonds, traditional physical mixing is replaced, and the long-acting stability of the corrosion inhibitor is improved. The corrosion inhibitor prepared by the invention has good slow-release effect and long-acting slow-release property, and can be used in the acidification process of oil and gas fields.

The invention relates to a purification method of an isepamicin sulfate crude product. Impurities comprise an impurity A, 3N-isepamicin, gentamicin B and the like. The method comprises the following steps: adding an isepamicin sulfate crude product aqueous solution into a water suspension generated by dialdehyde cellulose and sodium hydrogen sulfite, mixing and stirring while adjusting the pH value to 4-5 by using dilute sulphuric acid, generating Schiff base through a chemical reaction between amino groups of impurities and dialdehyde cellulose, forming impurity-loaded cellulose, and filtering to remove impurities, thereby obtaining the isepamicin sulfate crude product. The purity is greater than or equal to 99.2%, the yield is greater than or equal to 94.4%, and the dialdehyde cellulose can be regenerated and recycled. The method is simple to operate, high in yield and low in cost.

The application discloses a shrimp paste freshness real-time visual detection method, comprising the following steps: step 1, preparing a cellulose nanocrystal water suspension, adding sodium periodate and carrying out a reaction in the dark, after the reaction is completed, the reaction liquid is purified by dialysis and filtered by a filter membrane, and a dialdehyde cellulose nanocrystal film forming liquid is obtained; step 2, pouring the dialdehyde cellulose nanocrystal film forming liquid into a culture dish, and naturally drying to obtain a light blue responsive structural color film; step 3, placing the film in a packaging box containing shrimp paste and sealing, and real-time detecting the freshness of the shrimp paste. The method establishes a signal sensing mechanism of 'biogenic amine release -> Schiff base specific reaction -> pitch change -> structural color red shift', realizes nondestructive, in-situ, real-time and visual precise monitoring of the freshness of the shrimp paste, and solves the problems of high cost, complex operation, low accuracy and inability to real-time detection in the prior art.