11140 results about "Chitosan" patented technology

The invention discloses a microbial compound bacterial fertilizer for improving saline alkali soil and increasing the acting yield. A preparation method of the microbial compound bacterial fertilizer comprises the following steps: preparing a microbial agent containing phosphate-solubilizing bacteria, potassium-solubilizing bacteria, nitrogen-fixing bacteria, bacillus subtilis and actinomycetes; the preparation method comprises the following steps: preparing a sodium alginate solution, adding nano-hydroxyapatite and a microbial agent, uniformly mixing, dropwise adding a calcium chloride solution, and embedding an inner layer to obtain microbial embedded particles; uniformly mixing biochar, humic acid and attapulgite, taking a 2-3% HPMC solution as a binder, and carrying out middle-layer coating, so as to obtain prefabricated microbial fertilizer particles; and coating the chitosan-sodium alginate-nano ZnO outer layer to obtain the microbial compound bacterial fertilizer. The microbial compound bacterial fertilizer disclosed by the invention adopts a multi-layer and multifunctional collaborative design concept, realizes efficient protection and slow release of functional microorganisms in a saline-alkali environment, remarkably improves the physicochemical properties of soil and promotes the growth of crops.

It is disclosed new conducting and stretchable hydrogels and “one-pot” process to making them from natural and eco-friendly components, including gelatin, chitosan, and glycerol. Various conducting materials, such as poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), thermally reduced graphene (TRG), or MXene are introduced in the hydrogels to enhance their conductivity. The resulting conducting hydrogels exhibit remarkable robustness, do not require crosslinking agent, and possess a unique thermo-reversible property, simplifying the fabrication process and ensuring enhanced long-term stability. Moreover, their fabrication is sustainable, employing environmental-friendly materials and processes, while retaining their skin-friendly characteristics. It is also disclosed hydrogel electrodes that were tested for ECG signal acquisition and outperformed the commercial electrodes. The hydrogel-based electrodes deliver high-quality ECG signals, boasting a superior signal-to-noise ratio (SNR) and remarkable resilience against interference and motion artifacts, compared to their commercial AgCl counterparts.

The invention relates to the technical field of biological medicines, and discloses a high-activity lactobacillus rhamnosus probiotic microcapsule, which comprises the following components in parts by weight: lactobacillus rhamnosus: each gram of formula contains 1010 CFU; bifidobacterium: each gram of the formula contains 109 CFU; 10% to 20% of sodium alginate; 5%-15% of chitosan; 3%-8% of hydroxypropyl methyl cellulose; 3%-7% of pectin; 5% to 10% of fructo-oligosaccharide; 5%-10% of inulin; 0.1%-0.5% of vitamin C; and 0.1%-0.3% of vitamin E. Through double-layer and three-layer embedding technologies (such as compound use of sodium alginate and chitosan and compound use of pectin and gelatin), the tolerance of the probiotics in gastric acid and bile environments is remarkably improved, the probiotics are effectively protected through a multi-layer embedding structure, the survival rate of the probiotics in the gastric environment reaches up to 90%, and the release rate in the small intestine exceeds 75%.

The invention relates to the technical field of biological pharmacy, and discloses a probiotic microcapsule with a function of improving intestinal microecology, which comprises the following components in percentage by weight: lactobacillus rhamnosus: each gram of formula contains 1010 CFU of lactobacillus rhamnosus; lactobacillus acidophilus: each gram of the formula contains 109 CFU; clostridium butyricum: each gram of the formula contains 108 CFU; 5%-8% of a nano sodium alginate-chitosan compound; 3%-5% of peptide nanoparticles; 2%-4% of a natural polymer intelligent response film; 3%-6% of arabinoxylan oligosaccharide; 4%-7% of resistant dextran; 2%-4% of lentinan; and 0.1%-0.3% of resveratrol. Through a double-layer or three-layer embedding technology of the nano sodium alginate-chitosan compound and the intelligent response polymer film, the tolerance of the probiotics in gastric acid and cholate environments is remarkably enhanced, and targeted release of the probiotics in small intestines and colon is ensured.

Methods, systems and devices for removing iodide from an aqueous solution including submerging an iodophilic electrode in an aqueous solution containing iodide, applying a current to the electrode, and electrochemically oxidizing the iodide to iodine within the electrode. The electrode may include an iodophilic material and an electrically conductive material. It may also include a binder. The iodophilic material may be a starch, chitosan, carboxycellulose, cationic polymer, or an anion exchange membrane material, for example. After oxidizing the iodide to iodine within the electrode, the electrode may be submerged in a second solution and a current may be applied to reduce the iodine and release it from the electrode in the form of iodide into the second solution.

The invention relates to the technical field of animal feed preparation, in particular to a functional feed additive for ruminants and a preparation method of the functional feed additive for the ruminants, and the functional feed additive for the ruminants is characterized by consisting of the following components in percentage by mass: probiotics which are saccharomycetes, bacillus subtilis and enterococcus faecalis; an enzyme preparation, xylanase and protease; prebiotics are added; a microcapsule coating material; a binder; the balance is a carrier; the probiotics and the enzyme preparation are wrapped in the chitosan / sodium alginate composite film through a microcapsule coating technology, adverse factors such as temperature, humidity and illumination in the production, transportation and storage process can be effectively isolated, meanwhile, in the rumen low-pH, strong-protease and complex-microorganism environment, the coating layer can slowly release and protect active ingredients, and the effect of preventing and treating the probiotics and the enzyme preparation is achieved. Effective content and activity during final feeding are ensured, consistent growth promotion can be kept in different varieties, weights and feeding stages, and production benefits and feeding stability are improved.

The invention discloses environment-friendly oil-proof and water-proof packaging paper and a preparation method thereof.The surface of body paper is coated with an oil-proof agent to form an oil-proof coating, the oil-proof coating is coated with a water-proof agent to form a water-proof coating, and the oil-proof agent comprises a chitosan solution, a sodium alginate solution, a cross-linking agent and glycerin; the waterproof agent comprises a palm oil paraffin solution and hydrophobic nano silicon dioxide. The packaging paper disclosed by the invention has excellent oil-proof and water-proof performance and can be biodegraded, so that the pollution to the environment is reduced. The invention further discloses a preparation method of the environment-friendly oil-proof and water-proof packaging paper, operation is easy, and mass production of the oil-proof and water-proof packaging paper is facilitated.

The invention provides a pharmaceutical composition for preventing and treating gingival atrophy and a preparation method and application thereof, and belongs to the technical field of biological medicine. The composition contains finless eel peptide, skipjack elastin peptide, quinoa rice extract, gleditsia sinensis rice extract, calendula extract, chamomile extract, chitosan, peach gum, hydroxyapatite and the like, and the finless eel peptide, the skipjack elastin peptide, the quinoa rice extract and the gleditsia sinensis rice extract are specific enzymatic hydrolysates. The monopterus albus peptide, the skipjack elastin peptide, the quinoa rice extract and the gleditsia sinensis rice extract jointly promote repair and regeneration of gingival tissues. The calendula extract, the chamomile extract and the chitosan have anti-inflammatory and antibacterial effects, so that gingival inflammation is relieved, and bacterial infection is prevented. And the chitosan and the calendula extract can accelerate the repair of damaged gingival tissues. The monopterus albus peptide, the skipjack elastin peptide and the hydroxyapatite are matched for use to jointly maintain the normal structure and function of gingiva. All the components have a synergistic effect, so that gingival atrophy can be effectively prevented and improved.

The invention discloses a modified deacetylated chitosan composition as well as a preparation method and application thereof. The modified deacetylated chitosan composition comprises a modified deacetylated chitosan carrier and an active matter, the modified deacetylated chitosan carrier comprises deacetylated chitosan of which the surface is modified with amino acid and / or hydroxyethyl; the active matter carries negative charge groups, and the negative charge groups comprise at least one of carboxyl, sulfo, phosphate and sulfydryl; the mass ratio of the modified deacetylated chitosan carrier to the active matter is 1: (0.1-100). The modified deacetylated chitosan composition provided by the invention can enter the interior of the skin through pores of the skin by utilizing the specific physicochemical properties of the nanoparticles, achieves a good transdermal effect under the condition of not damaging the skin structure, and is natural, safe and high in transdermal efficiency.

The invention belongs to the technical field of metal organic frameworks, and particularly relates to a high-performance photocatalytic metal organic framework antibacterial material as well as a preparation method and application thereof. The preparation method comprises the following steps of: growing a metal organic framework UiO 66 which takes a cerium element as a metal node on a single-layer graphene oxide UiO66 (at) GO in situ, loading arginine small molecules in the MOF framework to obtain a high-performance photocatalytic MOF antibacterial material UiO66 (at) GO (at) arg, forming a nano hydrogel with a stable three-dimensional structure with chitosan, and performing antibacterial treatment by using the nano hydrogel as a wound dressing. The Ce-based MOF composite QCS / GO-UiO 66-coated arg / PNIPAm hydrogel prepared by the preparation method disclosed by the invention has excellent properties such as elasticity, adhesive power, water absorption and biocompatibility; and under illumination, the photocatalyst has an excellent photocatalytic sterilization effect, and has a good killing effect on escherichia coli and staphylococcus aureus.

The invention discloses a multifunctional water-retaining agent adapted to acid soil and a preparation method thereof, and the multifunctional water-retaining agent is prepared from the following raw materials in parts by weight: 9-11 parts of a chitosan solution with the concentration of 0.019-0.021 g / mL, 9-11 parts of a sodium polyphosphate solution with the mass concentration of 0.5-1%, 24-25 parts of an acrylic acid solution with the neutralization degree of 80-85%, 9-11 parts of a guar gum solution with the concentration of 0.019-0.021 g / mL and the balance of water. The mass of the methylene bisacrylamide accounts for 0.01-0.03% of the total dry matter mass of the chitosan, the guar gum and the acrylic acid, the mass of the ammonium persulfate accounts for 0.25-0.35% of the total dry matter mass of the chitosan, the guar gum and the acrylic acid, and the clay mineral accounts for 10-12 parts; the preparation method comprises the following steps: S1, pre-preparation; S2, mixing; and S3, post-treatment. The prepared water-retaining agent not only can greatly improve the water absorption and water retention performance of the chitosan water-retaining agent, but also can reduce the acidity of acid soil and improve the CEC and fertilizer retention capacity of the soil, and is a multifunctional acid red and yellow soil conditioner.

The invention provides a personalized functional nutritional tea point rich in tea polyphenol and resveratrol and a 3D printing manufacturing method. The personalized functional nutritional tea point comprises a shell and an inner core, wherein the shell and the inner core are respectively a shell gel material and an inner core gel material; the inner core gel material comprises a water-oil double-gel material rich in tea polyphenol and resveratrol; wherein the water-oil double-gel material is prepared by the following steps: adding chitosan, betaine and vanillin into a mixed solution of corn starch, chickpea protein and water, heating and incubating to obtain hydrogel; and dissolving the tea polyphenol in the hydrogel to obtain the tea polyphenol hydrogel. The oleogel is obtained by melting and mixing beeswax and linseed oil, and then dissolving resveratrol in the oleogel; the personalized functional nutritional tea point is high in content of active ingredients of tea polyphenol and resveratrol and has heat stability, illumination stability and storage stability; the 3D coaxial printing technology is utilized, the functional components are further stabilized, tea points of various patterns and shapes can be obtained, and the method has personalized food preparation and application value.

The invention discloses a corrosion inhibition type grey water scale inhibition dispersant and a preparation method thereof, belongs to the technical field of grey water dispersants, and aims to solve the problems of unstable scale inhibition performance and non-lasting scale inhibition efficiency of a grey water scale inhibition dispersant in the prior art. The technical problem that certain anti-corrosion and corrosion inhibition performance needs to be added to industrial grey water scale inhibition dispersants is urgently needed to be solved. The preparation method comprises the following steps that styrene, acrylamide and acrylic acid serve as raw materials, a polymer wall material is prepared, polyaspartic acid, a modified corrosion inhibitor and vanillin modified chitosan react, a core material is obtained, the core material and the wall material are prepared through a composite coacervation method, and the corrosion inhibition type grey water scale inhibition dispersing agent is obtained. The corrosion inhibition type grey water scale inhibition dispersant prepared by the invention has the advantages of stable and lasting scale inhibition effect and corrosion inhibition.

The invention provides a preparation method of a mixed pilatory of active peptide and stem cell exosome, and belongs to the technical field of pilatory preparation. The preparation method comprises the following steps: extracting the stem cell exosome; extracting an active extract; preparing an exosome entrapped active extract; preparing the liposome loaded active peptide; preparing the liposome loaded active peptide modified by the gallic acid modified chitosan; and preparing the mixed hair restorer. The prepared mixed hair restorer can provide a suitable growth environment for hair follicles and promote hair growth, the synergistic effect of the active peptide and the exosome can provide abundant signal molecules and enhance the stimulation effect on hair follicle cells, and the active peptide and the exosome can promote angiogenesis and increase the blood flow volume of scalp, so that the hair follicle can be effectively promoted. More nutrition and oxygen are provided for hair follicles, and the growth of hair is effectively promoted.

The invention discloses a monovalent selective cation exchange membrane, a preparation method thereof and an electrodialysis device, and relates to the technical field of ion exchange membranes. The preparation method of the monovalent selective cation exchange membrane comprises the following steps: soaking a cation exchange membrane loaded with a photoinitiator in a co-deposition modification solution containing dopamine, polyethyleneimine and chitosan, carrying out a co-deposition reaction under radiation initiation of ultraviolet light, taking out the cation exchange membrane after the reaction is finished to obtain a co-deposition modified membrane, and then carrying out heat treatment to obtain the monovalent selective cation exchange membrane. The monovalent selective cation exchange membrane is obtained. The ultraviolet light initiator and chitosan with certain adhesion are introduced in the co-deposition process, so that the co-deposition speed of dopamine and polyethyleneimine on the surface of the film is promoted, meanwhile, a base film and a co-deposition modified layer can be connected, the stability of the modified film is improved, the pore size screening effect is improved, and the service life of the film is prolonged. And moreover, ion exchange sites of the modified membrane are not occupied, monovalent and multivalent cations are effectively separated, and meanwhile, good ion flux is achieved.

The invention belongs to the technical field of cement manufacturing, and particularly relates to high-strength weather-resistant environment-friendly cement and a preparation method thereof. The environment-friendly cement is prepared from the following raw materials in parts by mass: 40 to 55 parts of Portland cement, 15 to 25 parts of fly ash, 10 to 15 parts of slag powder, 6 to 12 parts of biomass reinforced composite mineral material, 2 to 4 parts of nano silicon dioxide, 1 to 4 parts of modified polymer emulsion and 1 to 3 parts of additive. The biomass reinforced composite mineral material is prepared from zeolite, bentonite, sepiolite and chitosan; the modified polymer emulsion comprises a modified polyacrylate emulsion and a modified polystyrene-butadiene emulsion in a mass ratio of (1-3): 1; the additive is prepared from basalt fiber, sodium lignin sulfonate, a rosin thermopolymer and sodium gluconate. The environment-friendly cement prepared by the invention not only has high strength and good weather resistance, but also remarkably reduces carbon footprint and saves natural resources.

The invention relates to the technical field of textiles, in particular to a wear-resistant antibacterial flax blended yarn and a preparation process thereof. The method specifically comprises the following steps: S1, after performing ultraviolet irradiation on cotton fibers, putting the cotton fibers into a wear-resistant antibacterial solution, and performing dipping and drying to obtain wear-resistant fibers; s2: (1) modifying chitosan by using 6-maleimidohexanoic acid, so as to obtain modified chitosan; (2) sequentially reacting polyethylene glycol adipate with isophorone diisocyanate, modified chitosan and sodium 2-mercaptoethanesulfonate, and finally emulsifying to obtain a fiber treating agent; s3, (1) performing opening mixing, cotton carding, drawing, roving, spinning and spooling on the linen fibers and the wear-resistant fibers in sequence to obtain a linen blended yarn crude product; and (2) soaking the flax blended yarn crude product into the fiber treating agent, padding and drying to obtain the wear-resistant antibacterial flax blended yarn.

The invention relates to the technical field of environmental materials and water treatment, in particular to a graphene amino silica gel composite adsorbent for heavy metal wastewater treatment and a preparation method thereof.The graphene amino silica gel composite adsorbent is prepared from # imgabs0 nanoparticles, an amino-functionalized silicon dioxide coating layer, carboxylated reduced graphene oxide, a polydopamine modification layer and tetraethyl orthosilicate; the coating is prepared from the following raw materials: 3-aminopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, N-((4-vinyl benzyl) amino) diacetic acid, chitosan, beta-cyclodextrin, hexadecyl trimethyl ammonium bromide, polyethylene glycol, L-ascorbic acid, 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide. The composite adsorbent shows excellent adsorption performance on various heavy metal ions, and the adsorption performance is far higher than that of traditional adsorption materials and existing composite adsorbents.

The invention relates to a composite multi-effect scale and corrosion inhibitor and a preparation method thereof, and belongs to the technical field of water treatment agents.The composite multi-effect scale and corrosion inhibitor is prepared from carboxylic acid monomers, sulfonate monomers, organophosphorus compounds, modified chitosan, modified nanometer titania, oxidation type initiators, reduction type initiators, azole derivatives and the like, the modified chitosan is formed by coating the surface of chitosan with cerium chloride; the modified nano titanium dioxide is formed by coating the surface of nano titanium dioxide with sodium polyaspartate. The composite multi-effect scale and corrosion inhibitor is prepared in a mode of compounding while synthesizing, the scale inhibition effect is excellent, the comprehensive descaling capacity can reach 97% or above, and the composite multi-effect scale and corrosion inhibitor can be used for a high-pH, high-alkalinity, high-temperature and high-hardness circulating cooling water system under the high-concentration-multiple operation condition; the method is suitable for circulating cooling water treatment requirements under harsh conditions in industries such as chemical industry, smelting and light industry.

The invention discloses a chitosan modified lithium iron phosphate and carbon composite positive electrode material and a preparation method thereof.The preparation method comprises the steps that 1, lithium hydroxide, phosphoric acid and ferrous sulfate heptahydrate are mixed to prepare a uniform and stable solution, and a lithium iron phosphate precursor is prepared through a solvothermal method; step 2, dissolving chitosan in an acetic acid aqueous solution, and magnetically stirring under a water bath condition until the chitosan is completely dissolved to prepare a chitosan solution; and 3, adding the lithium iron phosphate precursor into a chitosan solution, uniformly mixing, carrying out ball milling and freeze drying, and carrying out high-temperature carbonization treatment in an inert gas to obtain the chitosan modified lithium iron phosphate and carbon composite positive electrode material. The method is simple to operate, low in cost and uniform in product particle size distribution.

The invention discloses a phosphorus removal filler and a preparation method and application thereof, and belongs to the technical field of fillers. Sulphoaluminate cement, chitosan, sodium alginate and calcium peroxide are uniformly mixed in a nitric acid solution in an amino-containing coupling agent, then foaming and pore forming are performed under steam, and the phosphorus removal filler is prepared. And finally, uniformly mixing with titanium dioxide, sodium silicate, a ferrous sulfate solution and sodium borohydride to obtain the phosphorus removal filler with an excellent phosphorus removal effect, and the phosphorus removal filler has a rich pore structure and adsorption activity, can sufficiently perform physical adsorption on phosphorus elements, and has a good phosphorus removal effect. Meanwhile, the phosphorus removal filler further has excellent surface complexing activity and photocatalysis, insoluble salt precipitates can be generated through reaction of iron elements and calcium elements and phosphate in water, so that total phosphorus is removed, the material is ground after adsorption saturation and put into a fish pond to serve as a phosphorus supplementing material, resource recycling can be achieved, and the cost is reduced. Wide application prospects are realized.

The invention discloses a method for preparing lubricating oil microspheres based on a microfluidic technology. The method comprises the following steps: preparing an external phase solution, an intermediate phase solution, an internal phase solution and a collection solution; firstly, the internal phase solution is introduced into the micro-fluidic chip, and after the flow of the internal phase solution is stable, the intermediate phase solution is introduced into the micro-fluidic chip to be sheared with the internal phase solution to form nuclear layer liquid drops. After the core layer liquid drops are generated stably, the external phase solution is introduced into the micro-fluidic chip to be sheared with the core layer liquid drops, so that the external phase solution wraps the outer layer of the core layer to form a shell layer with a core-shell structure, and then the double liquid drops are dropped into a collecting solution containing glutaraldehyde to be crosslinked and cured to form the chitosan lubricating oil microspheres. The chitosan lubricating oil microsphere has the following beneficial effects that the lubricating oil is wrapped in the microsphere through a microfluidic technology, so that the chitosan lubricating oil microsphere is of a core-shell structure, and when the lubricating oil is needed, the lubricating oil in the microsphere is released to improve the friction performance of parts.

The invention relates to the technical field of soil conditioners, and particularly discloses an intelligent controlled-release core-shell alginate soil conditioner and a preparation method thereof.The conditioner is of a core-shell-layer three-layer structure and comprises a core layer, a middle shell layer and an outer layer, the three layers account for 30%, 40% and 30% of the total weight respectively, and the core layer mainly comprises improved alginate and nutrients; the middle shell layer mainly comprises chitosan and a microbial preparation; and the outer layer mainly comprises modified charcoal and magnetic nano # imgabs0 #. The preparation method comprises the four steps of core layer preparation, middle shell layer coating, outer layer coating and forming post-treatment, and multiple functions of accurate nutrient supply, efficient heavy metal fixation and soil microenvironment regulation and control are achieved through a core-shell-layer three-layer structure design and a pH / temperature / microorganism triple response mechanism by adopting a coaxial electronic injection and layer-by-layer self-assembly technology; the fertilizer has a remarkable improvement effect on sandy soil and saline-alkali soil, and the organic matter increasing rate reaches 40%.

The invention relates to the technical field of agricultural fertilizers, discloses a seaweed extract-functional microorganism compound slow-release fertilizer and a preparation method thereof, and solves the problems in the background art. The seaweed extract is a compound containing enteromorpha polysaccharide and alginic acid extract; the functional microorganism is a complex microbial inoculant composed of phosphate solubilizing bacteria, nitrogen-fixing bacteria, phosphate solubilizing bacteria and bacillus; the slow-release carrier is prepared by coating the seaweed extract and the functional microorganisms with sodium alginate-chitosan microcapsules; the signal molecule is selected from at least one of polyamine substances and jasmonic acid methyl ester; the fertilizer has the advantages that the utilization rate of the fertilizer can be increased, growth and reproduction of soil microorganisms are promoted, the stress resistance of crops is improved, and the requirements of different soil types and planting environments can be met.

The invention discloses a high-barrier-property biodegradable food packaging film and a preparation method thereof, and relates to the technical field of food packaging. Comprising the following main components in parts by weight: 4-25 parts of a polymeric hybrid, 6-15 parts of an enzymatic degradation enhancer, 10-25 parts of a barrier material, 55-80 parts of a bio-based polymer, 30-40 parts of an intelligent degradation regulator, an intelligent responsive material, 10-15 parts of a novel starch derivative, 13-27 parts of novel polyester bio-ester and 20-40 parts of a chitosan-sodium alginate compound. Through the modified graphene, the high-barrier and high-wear-resistant biodegradation function is realized, the problems of food oxidation, dampness and deterioration caused by gases such as oxygen, water vapor and carbon dioxide are solved, and the shortening of the shelf life of food and the accumulation of wastes are avoided.

The invention belongs to antibacterial materials, and particularly relates to antibacterial modified waterborne polyurethane and a preparation method and application thereof.The preparation method of the antibacterial modified waterborne polyurethane comprises the following steps that polyol and diisocyanate are mixed and subjected to a prepolymerization reaction, and a polyurethane prepolymer is obtained; mixing the polyurethane prepolymer and a chain extender, and carrying out chain extension reaction; in the chain extension reaction, adding the graft and carrying out esterification reaction to obtain a first intermediate; mixing the first intermediate with triethylamine and carrying out neutralization reaction to obtain a second intermediate; and emulsifying the second intermediate in deionized water to obtain the antibacterial modified waterborne polyurethane. Compared with the prior art, the antibacterial waterborne polyurethane has the advantages that the problems of poor intermiscibility, low durability and the like in physical addition and the problems of limited binding objects and weak antibacterial effect in covalent binding in the antibacterial waterborne polyurethane in the prior art are solved. According to the scheme, arginine and chitosan are grafted to a molecular chain of waterborne polyurethane, so that the waterborne polyurethane is endowed with a synergistic antibacterial property.

The invention discloses a bamboo powder-containing biodegradable plastic for food contact and a preparation method thereof, and relates to the technical field of bio-based materials. The bamboo powder-containing biodegradable plastic for food contact comprises chitosan starch and modified bamboo powder, the chitosan starch is prepared by adding composite chitosan and amino-terminated polyethylene glycol into oxidized corn starch, and the composite chitosan is prepared by grafting chlorogenic acid on the surface of chitosan and then coating succinic anhydride derivatives. The succinic anhydride derivative is prepared from dodecenyl succinic anhydride and 1, 4-butanediamine through a reaction, so that the plastic has the antibacterial property, and meanwhile, the mechanical property is enhanced; the modified bamboo powder is prepared by reacting bamboo powder with a carboxyl-terminated composition, and the carboxyl-terminated composition comprises carboxyl-terminated polylactic acid and carboxyl-terminated polyamide. The toughness of the plastic is enhanced, and the mechanical property of the plastic is further enhanced.

The invention relates to the technical field of fertilizers, and discloses a coating material, a preparation method and application of the coating material in a trace element coating for potassium chloride particles. The preparation method comprises the following steps: reacting isophorone diisocyanate with polycaprolactone diol, tartaric acid and dimethylglyoxime to prepare a polyurethane prepolymer, continuously reacting the polyurethane prepolymer with chitosan oligosaccharide Schiff base to obtain chitosan oligosaccharide modified polyurethane, and mixing the chitosan oligosaccharide modified polyurethane, a cross-linking agent, silane modified isocyanate and a trace element solution to obtain the coating material. The coating material is good in mechanical property, contains trace elements, has a controlled release effect on the potassium chloride granulated fertilizer, and can be applied to the potassium chloride granulated fertilizer as a trace element coating.

The invention provides a coating preservation material as well as a preparation method and application thereof, and belongs to the technical field of chemical modification of biomass organic polymer materials. The structural formula of the chitosan / polyphenol / quaternary phosphonium salt derivative disclosed by the invention is as shown in # imgabs0 #. The preparation method comprises the following steps: modifying chitosan by using natural phenolic acid and quaternary phosphonium salt to prepare an amphiphilic chitosan derivative; then preparing a plant essential oil microcapsule by taking the amphiphilic chitosan derivative as a wall material and plant essential oil as a core material; and finally, compounding the plant essential oil microcapsules with a film-forming material to construct a film-coating fresh-keeping material, and applying the film-coating fresh-keeping material to fresh keeping of fruits and vegetables.

The invention belongs to the technical field of lithium batteries, and discloses a fluorine-doped lithium iron manganese phosphate positive electrode material and a preparation method thereof.The preparation method comprises the steps that hydrofluoric acid, manganese sulfate monohydrate, ferrous sulfate heptahydrate, lithium hydroxide monohydrate and phosphoric acid serve as raw materials, and a fluorine-doped lithium iron manganese phosphate precursor is prepared through a microwave-hydrothermal synthesis method; and forming a coating layer on the surface of the precursor by using SnO2-doped chitosan gel, and calcining to obtain the fluorine-doped lithium iron manganese phosphate positive electrode material. The positive electrode material comprises fluorine-doped lithium manganese iron phosphate particles and a SnO2 / C coating layer, doping of fluorine promotes diffusion of lithium ions of the positive electrode material, the structure of the material is more stable, SnO2 is doped in chitosan serving as a carbon source, the conductivity of the positive electrode material is improved, and on the basis of the synergistic effect of the fluorine element and metal ions of the coating layer, the conductivity of the positive electrode material is improved. A uniform and tightly combined carbon coating layer is formed on the surface of the material. The fluorine-doped lithium iron manganese phosphate positive electrode material prepared by the preparation method has excellent cycle performance and rate capability.