39 results about "Dialdehyde cellulose" patented technology

The invention discloses high-stability immobilized candida antarctica lipase B as well as a preparation method and application thereof, and belongs to the technical field of enzyme engineering and biological catalysis. The preparation method comprises the following steps: modifying resin by adopting a silane coupling agent to obtain silanized resin; carrying out aldehyde functional modification on the silanized resin by using dialdehyde cellulose to obtain alkyl-aldehyde modified resin; candida antarctica lipase B is immobilized by using alkyl-aldehyde modified resin, and after the Candida antarctica lipase B is subjected to interfacial activation on the surface of the alkyl-aldehyde modified resin, the Candida antarctica lipase B is covalently bound with aldehyde on the surface of the alkyl-aldehyde modified resin; the prepared immobilized Candida antarctica lipase B has relatively high activity and stability. The method is simple to operate, the prepared immobilized lipase is high in stability, and the method can be used for preparing the high-stability immobilized lipase on a large scale and has the potential of industrial popularization and application.

The invention relates to the technical field of polyurethane, in particular to bio-based waterborne polyurethane and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing dialdehyde cellulose by utilizing cellulose oxidation, then reacting the dialdehyde cellulose with hydroxylamine hydrochloride to prepare oximido modified cellulose, and finally introducing the oximido modified cellulose and dimethylglyoxime into a polyurethane system. Through the synergistic effect of the oximido modified cellulose and dimethylglyoxime, the bio-based waterborne polyurethane film has excellent self-repairing efficiency while keeping high tensile strength and elongation at break. The bio-based waterborne polyurethane is suitable for the fields of flexible electronic devices, coatings, biomedical materials and the like, and has wide application prospects and remarkable economic and social benefits.

The invention discloses a preparation method of a reversible covalent bond controlled slow-release bio-based nano-drug carrier. The preparation method comprises the following steps: firstly, oxidizing cellulose nanocrystals to obtain dialdehyde cellulose nanoparticles; reacting the dialdehyde cellulose nanoparticles with methoxy polyethylene glycol amine and sodium cyanoborohydride respectively to obtain cellulose nanoparticles grafted with a polyethylene glycol side chain; and finally, further covalently binding an amino-containing anti-cancer drug and the cellulose nanoparticles grafted with the methoxy polyethylene glycol side chain through a Schiff base reaction to obtain the reversible covalent bond controlled slow-release bio-based nano-drug carrier based on the Schiff base structure. The reversible covalent bond controlled slow-release bio-based nano-drug carrier obtained by the invention not only has high drug loading capacity, high salt tolerance and low cytotoxicity, but also realizes responsive release of the drug under an acidic condition, and can be used for targeting and slow-release treatment of cancer cells.

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 discloses a preparation method of bio-based carbon fibers. The method comprises the following steps: 1) preparing ammoniated lignin and dialdehyde cellulose; 2) adding the lignin and the cellulose into an ionic solvent according to a certain proportion, mixing and dissolving, and carrying out wet spinning to obtain a lignin / cellulose-based carbon fiber precursor; and 3) carrying out pre-oxidation and high-temperature carbonization treatment on the precursor to obtain the bio-based carbon fiber. According to the method, compatibility is improved through a covalent cross-linked network of ammoniated lignin and dialdehyde cellulose, efficient dissolution is achieved through an ionic solvent, the problems that lignin spinning is poor in stability, and traditional bio-based carbon fibers are low in carbon yield and high in process cost are solved, and the method has the advantages of being environmentally friendly in process and easy to operate; the prepared bio-based carbon fiber is good in mechanical property, high in carbon yield and easy for industrial production.

The invention discloses minoxidil mixed liquor and a preparation method thereof, and relates to the field of pharmaceutical preparations. When the minoxidil mixed liquor is prepared, dialdehyde cellulose, minoxidil and diethylenetriamine react through an emulsion method to prepare cellulose microspheres; reacting cellulose microspheres, bromohexane and methyl iodide to obtain modified cellulose microspheres; octamethylcyclotetrasiloxane and tetramethylcyclotetrasiloxane are subjected to a reaction, and polysiloxane is prepared; the preparation method comprises the following steps: reacting polysiloxane, allyl polyether and chloroplatinic acid to prepare modified polysiloxane; and uniformly mixing the modified polysiloxane, the modified cellulose microspheres and deionized water to prepare the minoxidil mixed liquor. The minoxidil mixed liquor prepared by the preparation method disclosed by the invention has good antibacterial activity, fat-soluble release property, foam stability and low irritation.

The invention belongs to the technical field of biological medicine, and particularly relates to cellulose cross-linked porcine small intestinal submucosa hydrogel as well as a preparation method and application thereof. The cellulose cross-linked pig small intestine submucosa hydrogel comprises a pig small intestine submucosa hydrogel and dialdehyde cellulose cross-linked with the pig small intestine submucosa hydrogel, the crosslinking is that the primary amino group of the porcine small intestinal submucosa hydrogel and the aldehyde group of the dialdehyde cellulose form an imine bond. The cellulose cross-linked porcine small intestinal submucosa hydrogel has excellent mechanical properties and biocompatibility, and can be better used for promoting stem cell osteogenic differentiation and preparing refined organoid structures.

The invention relates to zero-trans low-saturation double-gel-based normal-temperature cream as well as a preparation method and application thereof. The invention belongs to the field of plant cream. The invention aims to solve the technical problem that the existing vegetable oil-based cream cannot be stored at normal temperature, has transportation stability and does not have trans-low saturated fatty acid at the same time. The normal-temperature cream is prepared from hydrogel and oleogel, the oleogel is composed of plant base material oil and oleogel factors, the oleogel factors comprise one or more of dialdehyde cellulose, beewax, 12-hydroxystearic acid and ethyl cellulose, and the hydrogel is composed of water and hydrogel factors. The dialdehyde cellulose or at least two of the dialdehyde cellulose are added to serve as oil gel factors, the oil gel factors and gel factors in hydrogel are subjected to Schiff base reaction to improve the stability of a double-gel system, and the cream prepared after stirring does not need to be refrigerated and can be stored for a long time at the room temperature; the transportation and storage cost of the cream is greatly reduced.

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 invention relates to the technical field of human body lubricants, and particularly discloses a condom bubble lubricant containing hyaluronic acid and a preparation method of the condom bubble lubricant. The condom bubble lubricant containing hyaluronic acid is prepared from the following raw materials in parts by mass: 5 to 10 parts of hyaluronic acid, 1 to 3 parts of sodium alginate, 0.01 to 0.1 part of calcium ethylene diamine tetraacetate, 1 to 2 parts of nano silicon dioxide, 1 to 2 parts of surfactant, 60 to 120 parts of vegetable oil, 1 to 2 parts of citric acid, 1 to 2 parts of green tea extract, 1 to 2 parts of glutathione, 5 to 10 parts of plant essential oil, 1 to 3 parts of dialdehyde cellulose and 50 to 90 parts of water. According to the invention, the vagina can be effectively protected, the vagina mucosa can be effectively repaired, the immunoreaction can be effectively reduced, the good inhibition effect on common pathogenic bacteria is realized, the biocompatibility of the components and the human skin is high, the micro-ecological environment of the cavity is improved, the allergy and stimulation effects are avoided, the raw materials are easy to obtain, the operation is easy, and the reaction conditions are mild.

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 provides high-strength transparent antibacterial ultrathin paper and a preparation method thereof, and relates to the field of ultrathin paper. The preparation method of the high-strength transparent antibacterial ultrathin paper comprises the following steps: preparing carboxyl modified cellulose nanofibers, preparing dialdehyde cellulose nanocrystals, preparing an antibacterial composite coating, preparing raw paper of the ultrathin paper, and forming. According to the preparation method of the high-strength transparent antibacterial ultrathin paper, the transparency of the ultrathin paper can be further improved while the mechanical property and the antibacterial property of the ultrathin paper are improved; the prepared high-strength transparent antibacterial ultrathin paper has the characteristics of high strength, good flexibility and appropriate transparency, and the antibacterial rate can reach 99.9%.

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 invention relates to the technical field of wound treatment and sprayable hydrogel preparations, in particular to sprayable hydrogel and application thereof. The sprayable hydrogel comprises a first spraying agent and a second spraying agent, and the first spraying agent and the second spraying agent are alternately sprayed to form the hydrogel; the first spray is an aqueous solution of an amino-containing substance; the second spraying agent is an aqueous solution of an aldehyde group-containing substance; the pH of the first spraying agent and the pH of the second spraying agent are both 7.5-8.5; the amino-containing substance is gelatin or carboxylated chitosan. The invention further discloses application of the sprayable hydrogel to preparation of a hydrogel preparation for irregular wound healing. By adjusting the concentration of the gelatin solution and the dialdehyde cellulose solution, the mechanical strength of the hydrogel is improved on the basis of improving the gel forming speed of the hydrogel, and the problems of low gel forming speed and insufficient mechanical strength of the existing sprayable hydrogel are solved.

The application relates to the field of nanocellulose films, and relates to a sulfonated nanocellulose film with high proton conductivity and a preparation method thereof. In the method, deionized water is used as a medium, and cellulose is subjected to a light-avoiding oxidation reaction by using sodium periodate under the condition that the pH is 2-3, so as to obtain dialdehyde cellulose; the dialdehyde cellulose, 2-aminoethanesulfonic acid and 2-methylpyridine borane are subjected to a Schiff base reduction amination reaction in deionized water at 59-65 DEG C, and then impurities are removed, so as to obtain a sulfonated nanocellulose suspension; the sulfonated nanocellulose suspension is formed by using a vacuum filtration method, and then is dried, so as to obtain the sulfonated nanocellulose film with high proton conductivity. The application solves the problems of low cellulose proton conductivity, non-degradability and indirect environmental pollution caused by the preparation process, and has high proton conductivity.

The invention belongs to the field of hydrogel materials, relates to a Janus hydrogel based on temperature-responsive underwater adhesion carbon nanodots as well as a preparation method and application of the Janus hydrogel, and particularly relates to a preparation method of a conductive hydrogel capable of realizing temperature-controlled underwater adhesion based on carbon nanodots. The temperature-controlled underwater adhesion conductive hydrogel is prepared by taking N-isopropylacrylamide as a temperature response material and grafting hydroformylated cellulose with dopamine, dopamine is grafted to dialdehyde cellulose and fired into carbon dots, excellent adhesion is given, the hydrogel also has adhesion in hot water by changing the temperature, and the temperature-controlled underwater adhesion conductive hydrogel can be applied to the field of temperature-controlled underwater adhesion conductive hydrogel, so that the temperature-controlled underwater adhesion conductive hydrogel can be applied to the field of temperature-controlled underwater adhesion conductive hydrogel, and the temperature-controlled underwater adhesion conductive hydrogel can be applied to the field of temperature-controlled underwater adhesion conductive hydrogel. The unique temperature response type underwater adhesive hydrogel is constructed, the preparation process is simple, the performance is excellent, and the temperature response type underwater adhesive hydrogel is suitable for popularization and application.

The invention provides a preparation method and application of a fresh-keeping and antibacterial packaging film, and relates to the technical field of food packaging materials. The preparation method of the packaging film with the fresh-keeping and antibacterial functions comprises the following specific preparation steps: step 1, carrying out oxidation modification on a cellulose solution through sodium periodate under a dark condition, and carrying out heating compatibilization to obtain a dialdehyde cellulose solution; 2, dissolving at high temperature to prepare a polyvinyl alcohol solution; and 3, adjusting the proportion, mixing the dialdehyde cellulose, polyethyleneimine and the polyvinyl alcohol aqueous solution, stirring at a constant speed, degassing, paving, and naturally airing or drying to obtain the composite membrane. The composite film obtained by the method has multiple functions of high mechanical property, barrier property, oxidation resistance, antibacterial property and the like, is green and environment-friendly, and has important application value in the technical field of packaging films.

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 discloses a flame-retardant catalyst suitable for PET (polyethylene terephthalate), a flame retardant, a preparation method and application, and belongs to the technical field of halogen-free flame retardants, a supported catalyst is adopted and comprises the following raw materials in percentage by weight: 25-36% of ionic liquid, 0.5-0.8% of a metal catalyst and the balance of a carrier base material; the carrier base material is prepared from the following raw materials in percentage by weight: 28 to 35 percent of gelatinized starch, 18 to 22 percent of alkyl glucosamide, 8 to 12 percent of carbon nanofiber and the balance of activated carbon powder; the ionic liquid is prepared from the following raw materials in percentage by weight: 15 to 20 percent of 1-butyl-3-methylimidazolium trifluoromethanesulfonate, 10 to 12 percent of sodium tetrafluoroborate, 12 to 16 percent of dihydroxy quaternary phosphonium salt, 8 to 11 percent of acrylamide, 6 to 10 percent of dialdehyde cellulose and the balance of water. The metal catalyst is prepared from the following raw materials in percentage by weight: 30 to 35 percent of molybdenum carbide, 30 to 35 percent of chitosan and the balance of metallocene. Through the mode, the ionic liquid, the metal catalyst and the carrier base material are used for preparing the flame-retardant catalyst, the flame-retardant catalyst is used for preparing the flame retardant, the flame-retardant catalyst is used for playing a catalytic effect in surface modification of the flame retardant, the modification time of the flame retardant can be effectively shortened, and the subsequent PET production efficiency is improved.

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.