48 results about "Chitosan coating" patented technology

The invention relates to the technical field of self-leveling, and particularly discloses high-density gypsum-based self-leveling mortar and a preparation method thereof, the high-density gypsum-based self-leveling mortar comprises building gypsum, modified heavy calcium powder, quartz sand, modified silica powder, Portland cement and a plurality of additives, the modified heavy calcium powder is activated by a silane coupling agent and is subjected to composite coating modification by sodium alginate-microcrystalline cellulose, the modified silica powder is activated by a silane coupling agent and is subjected to coating modification by chitosan, and the preparation method comprises the following steps: S1, preparing the chitosan-coated modified silica powder; s2, preparing sodium alginate-microcrystalline cellulose composite coated modified heavy calcium powder; s3, uniformly mixing all the dry materials, adding the mixed admixture and water, and stirring to prepare mortar; according to the self-leveling mortar disclosed by the invention, pores are filled in a self-adaptive manner through the characteristic that the surface coating layers of the modified heavy calcium powder and the modified silica powder absorb water and swell, a stable high-molecular reinforced framework is formed after drying, and the high-molecular reinforced framework and mortar components generate a synergistic effect, so that the compactness of the self-leveling mortar is effectively improved.

The invention discloses a chitosan grafted tannic acid-iron composite coating solution based on mussel adhesion simulation and application of the chitosan grafted tannic acid-iron composite coating solution in mango preservation, and belongs to the technical field of food preservation. According to the method, tannic acid is grafted to chitosan through a free radical mediation method to form a compound, then ferric ions are added for crosslinking, and a composite coating film with mussel adhesion imitating characteristics is constructed. According to the method, the technical problems that a traditional chitosan coating film is poor in adhesion, low in polyphenol utilization rate and prone to failure in a high-humidity environment are solved, the shelf life of mangoes can be effectively prolonged, the postharvest loss is reduced, and the method has important industrial application value.

The invention relates to the technical field of soil improvement, and discloses a preparation method and application of a saline-alkali soil improvement fertilizer. The saline-alkali soil improvement fertilizer sequentially comprises acorus calamus-gypsum particles, a humic acid loaded activated carbon coating layer and a chitosan coating layer from inside to outside. The saline-alkali soil improvement fertilizer provided by the invention can effectively reduce the salt content and pH value of saline-alkali soil, and can effectively improve the organic matter content and total nitrogen content of the saline-alkali soil. The saline-alkali soil improvement fertilizer provided by the invention can effectively inhibit salt and alkali return of saline-alkali soil.

The invention provides a preparation process of a hyaluronic acid-chitosan coating and a contact lens with the hyaluronic acid-chitosan coating, and belongs to the technical field of surface coatings of contact lenses. The preparation method comprises the following steps: carrying out surface grafting treatment on a bare contact lens with high oxygen permeation rate, and alternately coating a chitosan solution and a hyaluronic acid solution with certain concentrations, so as to form a composite coating consisting of discontinuous single layers on the surface of the contact lens; the obtained contact lens with the hyaluronic acid-chitosan coating has high oxygen permeation rate, good antibacterial effect and moisturizing capacity, and has important significance.

This invention is related to the fields of medical biotechnology, nanobiotechnology, and nanomedicine. It involves a nanomedicine product that can release HOC1 (hypochlorous acid) at the tumor site in a controlled manner to treat lung cancer. HOC1 is a potent antimicrobial and antitumor agent that can target tumor tissues while minimizing damage to healthy tissues. The produced nanoparticles have a two-layer structure: the inner layer contains alginate, PFP (perfluoropentane), and Ca(OCl)2 to release HOC1, and the outer layer has a chitosan coating with folate and salicylic acid for targeting and proton release. The production process involves nanoemulsion and coating with the ionic gelation technique. When the nanoparticles are delivered to the lungs and targeted to cancer cells with folate, ultrasound radiation triggers the release of HOC1 to induce apoptosis and destroy cancer cells effectively, reducing side effects and improving treatment outcomes for lung cancer patients.

The invention discloses a chitosan modified turmeric-broccoli exosome hybrid nasal spray and application thereof, and belongs to the technical field of biological medicine and drug delivery. The nasal spray is formed by dispersing double plant exosome-lipidosome hybrids in a carrier for nasal cavities. The preparation method comprises the following steps: fusing curcumin carried by a turmeric exosome and sulforaphane carried by a broccoli bud exosome with a pH response liposome membrane containing 1, 2-dioleoyl-sn-glycerol-3-phosphoethanolamine, and modifying by chitosan to form a three-layer structure; the preparation method comprises the steps of exosome extraction, ultrasonic drug loading, liposome hybridization, chitosan coating and preparation blending. The nasal spray is high in entrapment efficiency and uniform in particle size, the chitosan enhances nasal adhesion, inflammation targeted drug release is achieved through pH response, the brain targeting efficiency and stability are excellent, and the adaptability to children is good. The curcumin and sulforaphane are used for targeted therapy of children autism spectrum disorder neuroinflammation, anti-inflammation and anti-oxidation are achieved through synergism of curcumin and sulforaphane, the curative effect is remarkable, and a new scheme is provided for treatment of related diseases.

The application provides a kind of image positioning sticker marking method based on iodine-gallium complex chelate, through chelation reaction to prepare excellent stability iodine-gallium complex developer, non-woven fabric substrate is modified by chitosan coating, combined with screen printing process to prepare high-precision positioning sticker, and establish standardized clinical marking process. The method uses iodine-gallium double element synergistic development mechanism, so that the CT value of the marking area is 350-400HU, the contrast of the surrounding tissue is improved by 40%, the development clarity retention rate is more than 92% after 48 hours of sticking, the positioning error is stable within 0.3mm, solves the pain points of traditional marking easy diffusion and poor adhesion. The application has excellent biocompatibility, the skin allergy rate is only 0.8%, the single patient positioning operation time is shortened to 5-10 minutes, the production cost is reduced by 40%, can be widely used in precise medical positioning scenes such as tumor radiotherapy and interventional surgery, has significant clinical popularization value.

The invention relates to a fresh-keeping method for Xuangxiang kiwi fruits by combining a lonicera confusa compound extract with chitosan coating treatment, and belongs to the technical field of fruit fresh-keeping. The method is characterized in that Xuangxiang kiwi fruits which are 80% mature, uniform in size, free of plant diseases and insect pests, free of mechanical damage and provided with fruit stems are soaked in a lonicera confusa compound extract for 8-12 min, and then chitosan treatment liquid is used for coating treatment. The lonicerae flos compound extract is prepared by the following steps: soaking a proper amount of high-quality lonicerae flos medicinal material, a proper amount of galangal medicinal material and a proper amount of clove medicinal material in water for 25 minutes, and boiling for 25 minutes Cooling and soaking the Xuangxiang kiwi fruits; and then carrying out film coating treatment by using a chitosan treatment solution. According to the method, the storage quality of the Xuangxiang kiwi fruits can be improved, the storage period of the Xuangxiang kiwi fruits can be prolonged, the fresh-keeping period of the Xuangxiang kiwi fruits at normal temperature can reach 50-60 days through treatment and is prolonged by 20-30 days compared with the fresh-keeping period of the Xuangxiang kiwi fruits without treatment, and the rotting rate can be reduced to 15% or below; the good sensory quality of the Xuangxiang kiwi fruits is maintained; the materials used for treatment are all natural plant raw materials, and are green, healthy and harmless.

This application relates to the field of water pollution control technology and discloses a method for preparing a sediment microecological reconstruction and pollutant-targeted immobilization conditioner. The method includes: modifying mesoporous silica with amino- and thiolated compounds and mixing it with biochar to obtain an adsorbent material; dispersing ferrous sulfate, sodium thiosulfate, and hydroxyapatite with the adsorbent material in a sodium alginate solution and adding it dropwise to a calcium chloride solution for cross-linking and chitosan coating to obtain microcapsules; compounding riboflavin, humic acid, carbon source nutrients, and adding signaling molecules to obtain a metabolic enhancer; compounding metalloenzyme inhibitors and activating them with microorganisms to obtain an activator; granulating and coating calcium carbonate, magnesium hydroxide, ferrous sulfate, sulfur powder, calcium peroxide, and sodium lactate to obtain buffer particles; mixing the adsorbent material, microcapsules, and buffer particles, spraying, adding the metabolic enhancer and activator, adding binders and pore-forming agents, granulating, drying, sieving, and spraying a protective film to obtain the conditioner. This application solves the technical problems of existing sediment conditioners, such as single function, uncontrolled release, and microecological imbalance.

The invention relates to the technical field of papermaking, and discloses a method for preparing cardboard paper by using composite mineral fibers, which comprises the following steps: dispersion and micro-nano treatment of attapulgite, preparation of a chitosan-attapulgite composite material, preparation of composite mineral fibers, paper pulp mixing and papermaking. Through micro-nanocrystallization treatment of attapulgite and coating modification of chitosan, the binding force of the composite mineral fiber and the paper pulp fiber is remarkably enhanced, and the mechanical properties such as tightness, burst index and ring crush index of finished paper are superior to those of standard requirements; besides, by adding the composite mineral fibers, fine fibers in the white water are removed, the fiber retention rate is increased, part of paper pulp fibers can be replaced, use of chemical auxiliary materials is reduced, the production cost is reduced, the production efficiency and the finished paper quality are improved, and the clean papermaking purposes of quality improvement, efficiency improvement and pollution reduction are achieved. Therefore, considerable economic benefits and social benefits are obtained.

The present application relates to the technical field of animal feed nutrition, and discloses a coated lavender essential oil microcapsule as well as a preparation method and application thereof.The microcapsule has a double-layer structure and comprises, from inside to outside, a core and a chitosan coating layer wrapped outside the core; the core is an essential oil-beta-cyclodextrin complex; the essential oil-beta-cyclodextrin complex is formed by vacuum adsorption inclusion of lavender ester essential oil obtained by short path distillation of lavender essential oil at 6-8 kPa and 45-55 DEG C and beta-cyclodextrin.The coated lavender essential oil microcapsule prepared by the double-layer coating technology realizes efficient utilization of lavender essential oil in livestock and poultry, significantly improves the growth performance of animals, effectively reduces the incidence of diarrhea, and shows the comprehensive effects of selective bacteriostasis and immune enhancement, thereby providing a feasible solution for green feed additives to replace antibiotics.

This invention discloses a microsphere-filled lysozyme-chitosan / casein composite antibacterial hydrogel and its preparation method. The technical solution involves using casein as a substrate, with lysozyme adsorbed onto the surface of casein micelles via electrostatic forces, and chitosan coating the outer layer of the lysozyme. The casein micelle solution, lysozyme solution, and chitosan solution are uniformly mixed through physical blending. Electrostatic forces physically cross-link the carboxyl groups on the casein micelle surface with the cations of lysozyme and chitosan amino groups, forming a microsphere-filled lysozyme-chitosan / casein composite hydrogel. This material exhibits excellent sustained-release performance, is environmentally friendly, has good biocompatibility, stable performance, and good antibacterial function.

The invention relates to the technical field of soil regeneration, and discloses a passivation method of arsenic-cadmium combined polluted soil, which comprises the following steps: S1, fully mixing any two or three of calcium bentonite, vermiculite and ferric sulfate in proportion, and carrying out ball milling activation treatment to form a mineral mixture; s2, adding pretreated manganese dioxide nanoparticles and ferric iron salt into the mineral mixture, adjusting the pH value of a reaction system to 4.0-5.5, and reacting for 8-12 hours under a stirring condition to form particles coated with a composite oxide layer on the surface; s3, drying and crushing the particles of which the surfaces are coated with the composite oxide layers, and carrying out sulfhydrylation chitosan coating, so as to obtain a passivation material; and S4, mixing the passivation material and the arsenic-cadmium combined polluted soil according to a ratio, and carrying out ball milling. The problem that the synchronous passivation effect of arsenic and cadmium in soil is poor can be solved.

The application discloses a regenerated cellulose non-woven fabric based on chitosan modification and a preparation method and application thereof, and comprises a non-woven fabric layer composed of regenerated cellulose fibers, wherein a gel layer formed by methacrylated chitosan and tannic acid is coated on any one side of the non-woven fabric layer, the content of the methacrylated chitosan in the gel layer is 10-30%, the content of the tannic acid is 1-30%, the grafting rate of the methacryl group in the methacrylated chitosan is 10-40%, the thickness of the gel layer is 0.1-5 mm, the antibacterial circle diameter is 1.1-1.4 cm, the equilibrium swelling rate is 110-220%, and the antioxidant rate is 60-90%. The water gel-like methacrylated chitosan coating layer is formed on the surface of the regenerated cellulose non-woven fabric, the antibacterial and antioxidant activities of the composite non-woven fabric are improved, meanwhile, the water gel-like coating layer contacts the skin wound, is beneficial to the moist healing of the wound, and can effectively inhibit the bacterial propagation and accelerate the skin wound healing. The modified non-woven fabric has excellent moisture absorption, moisture retention, antibacterial and antioxidant functions.

This invention relates to the field of fluoride-containing wastewater treatment technology, specifically to a method for preparing a high-efficiency composite defluoridating agent and its application. The composite defluoridating agent provided by this invention comprises a composite defluoridating core, a chitosan coating layer, and an F-imprinted outer layer. The composite defluoridating core is formed by in-situ co-precipitation of Mg-Al-La layered double hydroxides by chitosan complexing with Mg, Al, and La metal sources, and the introduction of TiO2 and MnO2 functional oxides. The chitosan coating layer coats the surface of the composite defluoridating core. The F-imprinted outer layer... ‑ The outer layer of the imprint is formed by pre-assembly, cross-linking, and template elution of fluoride ion template, quaternized chitosan, and chitosan. This invention also provides a composite defluorinating agent working solution obtained by mixing a double aluminum salt solution and a composite defluorinating agent dispersion, used for deep defluorination treatment of fluoride-containing wastewater containing competing anions of phosphate, silicate, bicarbonate, and / or carbonate, with advantages such as high defluorination efficiency, good selectivity, and strong anti-interference ability.

The invention discloses a tooth orthodontic bracket EGCG (epigallocatechin gallate)-based functional binder and a preparation method thereof in the field of binders. Comprising the following components in parts by weight: 25 to 30 parts of bisphenol A dimethacrylate, 15 to 20 parts of triethylene glycol dimethacrylate, 0.6 to 0.8 part of camphorquinone, 0.6 to 0.8 part of dimethylaminoethyl methacrylate, 3 to 5 parts of EGCG (epigallocatechin gallate) loaded nanoparticles and 6 to 8 parts of modified chitosan. Through the core structure design of loading EGCG (epigallocatechin gallate) on cationic nano silicon dioxide and coating modified chitosan for multiple times, the dual core advantages of accurate pH response controlled release and safe adaptation to the oral environment are realized in the application of the dental orthodontic bracket adhesive, the effect is supported by a clear mechanism, and release, bacteriostasis and toxicity test data verify that the dental orthodontic bracket adhesive has a good application prospect. The clinical application requirements are completely met.

The invention discloses a multi-probe grafted magnetic metal framework material, a preparation method and application of the multi-probe grafted magnetic metal framework material in enrichment of body fluid exosomes. The multi-probe grafted magnetic metal framework material is a material with a core-shell structure, the core of the material is a ferroferric oxide magnetic core, a shell layer of the material sequentially comprises a polydopamine coating, a zirconium-based organic metal framework shell layer and a chitosan coating from inside to outside, and two types of exosome recognition groups, namely an alkyl quaternary ammonium group and a phospholipid group, are grafted on the surface of the material. The material is a novel composite magnetic metal framework material formed by grafting alkyl quaternary ammonium and a phospholipid molecular probe on the surface of a zirconium-based organic metal framework material, and enrichment of exosomes in body fluid is realized through coordination, electrostatic adsorption and hydrophobic interaction.

The invention provides an antibacterial nickel-titanium alloy bone tissue engineering scaffold as well as a preparation method and application thereof. The preparation method comprises the following steps: polishing a nickel-titanium alloy sheet; carrying out acid etching treatment on the nickel-titanium alloy sheet subjected to the polishing treatment; then adopting glutaraldehyde crosslinking to introduce a chitosan coating; and introducing a sodium alginate coating and a chitosan quaternary ammonium salt coating to prepare the antibacterial nickel-titanium alloy bone tissue engineering scaffold. According to the antibacterial nickel-titanium alloy bone tissue engineering scaffold, the chitosan quaternary ammonium salt coating is formed on the surface of the nickel-titanium alloy in a layer-by-layer self-assembly mode, the tissue compatibility of the nickel-titanium alloy can be effectively improved, the antibacterial activity is good, the osteogenic activity of osteoblasts can be enhanced, proliferation of the osteoblasts is facilitated, and the bone tissue engineering scaffold has a good application prospect. And the material can be widely applied to bone substitute materials.

The present invention relates to a circadian rhythm regulation-based pH responsive anti-decline microsphere composition and application thereof, the circadian rhythm regulation-based pH responsive anti-decline microsphere composition comprises an inner sodium alginate microsphere and an outer chitosan coating layer, the inner sodium alginate microsphere encapsulates berberine and hyaluronic acid; the outer chitosan coating layer is used for coating nicotinamide, resveratrol and the inner sodium alginate microspheres. The pH response type anti-decline microsphere composition is applied to a skin care product. Compared with the prior art, the preparation method has the advantages that the circadian rhythm adaptive release of active ingredients is realized by constructing a pH response type double-layer microsphere structure of'sodium alginate on the inner layer and chitosan on the outer layer '.

The invention belongs to the technical field of food processing, and discloses an anti-sugar and anti-oxidation composition containing glutathione yeast and a preparation method thereof.The composition comprises, by mass, 2-10 wt% of an endogenous antioxidant, 5-20 wt% of an exogenous antioxidant, 8-25 wt% of an anti-sugar agent, 5-15 wt% of vitamins and 30-80 wt% of natural active ingredients, and the endogenous antioxidant is the glutathione yeast. The components are coated by different coating layers to respectively obtain a coating antioxidant containing a calcium ion coating layer, a coating compound containing a polyglutamic acid coating layer, a coating vitamin containing a chitosan coating layer and a coating natural component containing a pectin coating layer. Therefore, the effect that the anti-sugar and anti-oxidation components can be accurately released to the absorption part while the efficacy is maintained is achieved.

The invention provides an intelligent dressing for dynamically detecting wound infection based on a colloidal gold wrapped dye and a preparation method of the intelligent dressing. The intelligent dressing is sequentially composed of an outer layer fixed PU film, a colloidal gold-dye complex and a one-way flow contact layer. The colloidal gold-dye complex is formed by wrapping the surfaces of colloidal gold nano-particles with a pH response dye and fixing the colloidal gold nano-particles through physical adsorption; the one-way flow contact layer is made of PP / PLA bi-component non-woven fabric, and the PP / PLA bi-component non-woven fabric is coated with a chitosan coating after plasma treatment. Multi-signal cross validation of bacteria is realized and a'monitoring-nursing 'closed-loop system is constructed through the colloidal gold loaded dye, and the system can be used for visually monitoring wound infection states in real time, finding potential infection risks in time, reducing the false alarm rate and synchronously adopting anti-infection treatment. The method has the advantages of low cost, dynamic monitoring, high sensitivity and the like.

The invention discloses a dimethyl sulfate green production process based on sulfur trioxide purification, and belongs to the technical field of preparation of organic chemical raw material dimethyl sulfate, high-purity purified sulfur trioxide is prepared through a sulfonation molecular sieve, impurities are removed, a stepped esterification reaction is carried out in two stages, no catalyst is used, and the production process is simple and convenient. Dynamic dehydration is carried out by using a sulfated molecular sieve; and finally, low-temperature rectification is carried out to complete the green production process of dimethyl sulfate. Chitosan reacts with 3-mercaptopropyltrimethoxysilane to obtain a sulfated chitosan coating layer, a molecular sieve precursor is coated and carbonized to obtain the sulfated molecular sieve with multistage pores, and due to the existence of the multistage pores and dissociation of sulfonic groups in a solution, surface sites with permanent negative charges are formed, so that the sulfated molecular sieve with the multistage pores is obtained. Positively charged heavy metal ions can be adsorbed and removed, so that high-purity purified sulfur trioxide is obtained, and green production of dimethyl sulfate is ensured.

This invention discloses a multilayer microsphere for the prevention and / or treatment of bacterial diarrhea, its preparation method, and its applications, relating to the field of biomedical technology. The multilayer microsphere has a three-layer core-shell structure: the core layer is loaded with *Lactobacillus plantarum* and sodium butyrate, the middle layer is a chitosan coating layer, and the outer layer is a sodium alginate coating layer. This invention has found that *Lactobacillus plantarum* and sodium butyrate have a significant synergistic antibacterial effect, effectively inhibiting the proliferation of pathogenic *Escherichia coli* and *Salmonella*. In vivo experiments have confirmed that the multilayer microsphere can effectively restore the body weight of diarrhea-prone animals, repair pathological damage to the jejunum and colon, and alleviate intestinal inflammation at the molecular level by inhibiting the activation of NF-κB and MAPK inflammatory pathways, downregulating the expression of pro-inflammatory factors IL-1β, IL-6, and TNF-α, and upregulating the level of the anti-inflammatory factor IL-10. The multilayer microsphere provided by this invention can serve as a novel, green, and safe formulation suitable for the prevention and control of bacterial diarrhea in livestock and poultry farming.

The invention discloses an edible composite coating preservative for flour products, and relates to the technical field of food preservation, the edible composite coating preservative is prepared by compounding a chitosan solution and a xylooligosaccharide solution according to a volume ratio of 1: 1, the concentration of the chitosan solution is 7.5 mg / mL, and the concentration of the xylooligosaccharide solution is 7.5 mg / mL; according to the edible composite coating preservative for the flour products, a compact film formed by chitosan can effectively isolate oxygen, inhibit growth of aerobic microorganisms and reduce water evaporation; the xylooligosaccharide further reduces the water activity in the steamed bun by virtue of the excellent water binding capacity, and inhibits the reproduction of microorganisms from the internal environment. Through combination of the chitosan coating film and the chitosan coating film, physical barrier and internal environment regulation and control are combined, and the fresh-keeping effect is obviously better than that of a single chitosan coating film.

The utility model belongs to the technical field of medical instruments, and discloses a tearable sheath for percutaneous renal puncture surgery, which comprises a sheath tube, a non-degradable balloon component is mounted on the sheath tube, the sheath tube comprises a tearable hard tube and a tearable soft tube, the tearable soft tube is arranged on the inner side of the tearable hard tube, and the tearable soft tube is connected with the tearable hard tube. The inner wall of the tearing hard tube is coated with a chitosan coating, the outer surface of the tearing hard tube is coated with a hyaluronic acid coating, a special material with hemostasis and anti-adhesion functions and a surface treatment process are adopted, in the operation process, once bleeding occurs, the hemostasis effect can be achieved in time, the bleeding amount is reduced, the operation risk is reduced, and meanwhile the operation efficiency is improved. After the operation, the adhesion of tissues and the sheathing canal can be effectively prevented, the pain of a patient is relieved, the postoperative recovery is promoted, the balloon filling degree, the supporting force, the drug release rate and the like can be flexibly adjusted according to the operation process and requirements, the ability of the operation to deal with complex conditions is improved, and the operation safety and effect are guaranteed.

The invention relates to the technical field of medical materials, and particularly discloses a titanium surface composite coating with osteogenesis promoting and antibacterial functions. The micro-arc magnesium oxide coating is arranged on the surface of the titanium substrate; the chitosan coating is arranged on the surface of the micro-arc magnesium oxide coating; the chlorogenic acid is loaded in the chitosan coating; a magnesium-containing porous microstructure is constructed on the surface of a titanium substrate through a micro-arc oxidation technology, so that the biological activity and corrosion resistance of the coating are improved; furthermore, chitosan is used as a biocompatible carrier to load a traditional Chinese medicine active ingredient chlorogenic acid, so that the surface of the implant has excellent osteogenic differentiation promoting capability and broad-spectrum antibacterial property at the same time. Physical modification, biopolymer drug loading and traditional Chinese medicine active ingredients are combined, and the problems that a traditional titanium implant is high in surface biological inertness, infection is likely to be caused and osseointegration is poor are solved through the synergistic effect on the three aspects of the structure, the material and the biological function.

The invention relates to the field of metal additives, and discloses a high-dispersion silicon additive suitable for low-temperature smelting and application of the high-dispersion silicon additive in aluminum alloy, the additive comprises the following raw materials in parts by mass: 85-92 parts of silicon powder, 2-5 parts of a coating agent, 3-6 parts of a composite fluxing agent and 1-3 parts of a modifier; the surface of the silicon powder is subjected to plasma activation treatment. According to the invention, a raw material formula is optimized, plasma activated silicon powder is taken as a core, and a sodium alginate modified chitosan coating agent, a specific composite fluxing agent and a nano titanate modifier are matched; the technology parameters are optimized, low-temperature smelting at the temperature of 700-750 DEG C is achieved, the silicon dispersity and recovery rate are improved, energy consumption and the impurity content are reduced, the pain point of a traditional technology is solved, and the high-end aluminum-silicon alloy production requirement is met.

The preparation method comprises the following steps: carrying out chitosan coating treatment to obtain a chitosan composite membrane, dissolving an aniline monomer in a hydrochloric acid solution, preparing a transparent and uniform aniline solution, weighing an oxidizing agent according to a certain proportion, dissolving the oxidizing agent in the hydrochloric acid solution, and carrying out ultrasonic treatment to obtain the gradient-aperture chitosan-polyaniline composite membrane. Preparing an oxidizing agent solution, immersing the chitosan composite membrane into an aniline solution, standing, dropwise adding the oxidizing agent solution into the chitosan composite membrane for reaction, and cleaning and drying after the reaction is finished to obtain the chitosan-polyaniline composite membrane. A chitosan composite membrane is coated with polyaniline through an aniline oxidative polymerization process to prepare the chitosan-polyaniline composite membrane, the composite membrane is of a gradient aperture structure, a compact surface layer of the composite membrane is beneficial to interception of submicron emulsified oil, and large bottom layer holes can ensure high flux and realize water-oil separation; the separation efficiency reaches 90% or above, and the concentration of petroleum in effluent is lower than the national standard limit value.

The invention belongs to the technical field of preparation of bio-based composite materials, and particularly relates to a composite material based on biological straw powder and polypropylene and a preparation method of the composite material. Polypropylene is used as a base material, and the characteristics of excellent comprehensive mechanical property, low cost and easy processing of polypropylene are fully exerted. According to the invention, through an original chitosan coating, phosphate starch crosslinking and modified silane coupling agent grafting multistage synergistic interface modification process, the interface compatibility between the straw powder and a PP base material is greatly improved, the mechanical property fluctuation caused by low-proportion filler addition is avoided, the straw powder is ensured to be uniformly dispersed in the PP base material and form strong interface bonding, and the mechanical property of the PP base material is improved. Even if only 1% of low-proportion filler is added, the impact toughness of the composite material can be remarkably improved, meanwhile, mechanical property attenuation caused by introduction of the filler is completely avoided, and the long-term performance stability and reliability of a product in the using process are ensured.

The application provides a postharvest preservation method of mango, which comprises the following steps: S1. picking and pretreatment, S2. short-wave ultraviolet mild irradiation treatment, S3. preservative solution immersion and storage. The preservative solution is composed of phyllium extract solution, mango leaf extract solution, arginine grafted modified chitosan, glacial acetic acid and sterile water. Through the synergistic process of the short-wave ultraviolet mild irradiation and the preservative solution immersion, combined with the multiple effects of the modified chitosan coating and the plant extract, the mango can be stored for 30 days under the condition of 13-15 DEG C and 85-90% relative humidity, the good fruit rate is still kept to be more than 90%, and the weight loss rate is less than 5%, so that the industry problems that the mango is prone to rot and fast water loss after harvesting are effectively solved. The components of the preservative solution used in the application are all safe natural sources, no chemical synthetic fungicides are used in the whole process, there is no pesticide residue risk, and the green preservation and food safety requirements are met.