79results about How to "Easy to crosslink" patented technology

The invention relates to the technical field of the food additive and the microcapsule equipment capable of controlling the release of bioactive substances, in particular to a preparation method of menthol microcapsules. The preparation method uses menthol, wall material, emulsifier, crosslinking agent, pH regulator and water as the raw materials, wherein menthol is used as the core material, chitosan is used as the wall material, monoglyceride and Tween-40 are used as the compound emulsifier, 10% acetic acid is used as the pH regulator. The preparation method comprises the following steps: emusifying the solution under high pressure, adding modified starch to crosslink, finally adopting the spray drying technology to prepare the powdery menthol microcapsule product. The invention aims to provide a menthol microcapsule preparation method with safe and easy technology and low cost, increase the stability and heat resistance of menthol, control the release process and expand the application range.

The invention discloses azobenzene structure based high-temperature self-cross-linked expanded flame-retardant anti-dripping copolyester and a preparation method thereof. The copolyester is composed of structural units represented as I, II and III or structural units represented as I, II, III and IV by means of random copolymerization, and the intrinsic viscosity [eta] of the copolyester is 0.25-1.30dL / g. A high-temperature self-cross-linked group introduced into the copolyester is an azobenzene-structured compound with a unique pi-pi large conjugated system, has no influence on copolyester synthesis and processing and can be heated to burn for quick thermochemical crosslinking to form carbon at high temperature to form a separation layer, so that excellent flame retardation and anti-dripping effects can be obtained. The selected compound with the azobenzene structure is cheap, and the method is mature in process, simple and convenient to operate, easy to control and suitable for industrial production.

The invention discloses a cable sheath tube for ships, which is prepared by the following steps of: pre-processing, mixing, granulating and drying a mixture of a basic resin, an elastomer, an antioxidant, a light stabilizer, a flame-retardant system, a softening agent, a mildew inhibitor, a radiosensitizer and a color master batch; forming the tube with the materials; and finally irradiating the formed tube by an electron beam. The cable sheath tube prepared by the invention has high elasticity and flexibility, low-smoke, zero-halogen, excellent flame retarding effect, high corrosion resistance, high aging resistance, high mechanical strength, high sealing performance, simple and convenient installation and easy change and installation of a route and effectively solves the problems of protection of various power cables and signal cables inside and outside the ships.

The invention discloses a polyolefin cable material and a preparation method thereof. The polyolefin cable material is prepared from, by weight, 20-40 parts of ethylene-vinyl acetate copolymer resin, 10-30 parts of polyolefin elastomers, 20-50 parts of ultralow-density polyethylene, 0-15 parts of functional polyolefin resin, 0-180 parts of a flame retardant, 0.5-1.5 parts of a crosslinking sensitizer, 0.5-2 parts of an auxiliary crosslinking agent, 0.1-0.5 part of a chain extender, 0.5-2 parts of an antioxidant and 3-9 parts of a processing aid. The polyolefin cable material is wide in application range, the flame-retardant polyolefin cable material or the non-flame-retardant polyolefin cable material can be prepared, and extrusion moulding is easy; in addition, the polyolefin cable material has the high crosslinking sensitization activity, volatilization is not prone to occur and no smoke is generated during extrusion, health of production personnel can be protected, and the operation environment is improved.

A method is disclosed for making on a transparent receiver material a continuous tone image, e.g. for medical diagnostic purposes, with an obtainable maximal transmission density in the visual region greater than 3.0, by means of ink jet. The method comprises ink-jetting combinations of at least one liquid black pigmented ink and at least one liquid grey ink to a transparent receiver comprising an ink receiving layer, a transparent support and a backing layer, said ink receiving layer comprising a N-containing polymer, preferably gelatin, as binder, and being substantially free of particles having an average size larger than 1 mum. Preferably the transparent receiver exhibits a haze value between 10 and 20%, determined according to standard test ASTM D 1003, due to the presence of a spacing agent in the backing layer.

The invention relates to sulfonic acid modified carboxymethyl hydroxypropyl guar gum, and a preparation method and application thereof. The structural formula of the sulfonic acid modified carboxymethyl hydroxypropyl guar gum is shown in the specification, wherein R is H, and n is 0, 1, 2 or 3; or R is OH, and n is 0-6. The preparation method comprises the following steps: adding carboxymethyl hydroxypropyl guar gum into a reaction vessel, and adding an alcohol water solution; in a nitrogen atmosphere, dropwisely adding a sodium hydroxide water solution, heating to 65-80 DEG C while stirring, dropwisely adding a sulfonating agent, and reacting for 3-10 hours; and regulating the pH value of the solution to 7 with acid, filtering, collecting solids, and drying to obtain light yellow powder, namely the sulfonic acid modified carboxymethyl hydroxypropyl guar gum. The prepared sulfonic acid modified carboxymethyl hydroxypropyl guar gum is high in thickening efficiency, low in surface / interface tension, easy to realize viscosity break and beneficial to flowback.

The invention relates to silicone compositions that are used in the production of varnishes that can be applied to supports in order to reduce the friction coefficient. The inventive composition comprises at least one polyorganosiloxane A (POS) which can be cationically and radically cross-linked by functional cross-linking groups (GFR) and a primer C chosen from onium borates, charcterised in that the inventive composition also comprises molecules (POS D) which are substituted by secondary functional groups (GFS) carried by silicon atoms and selected from those that include at least one alkoxy and / or epoxy and / or carboxy motif and optionally a charge (e.g. silica). The invention can be used with anti-friction varnishes for RTV silicone coatings for material used in air bags, thermal transfer ribbons or packing films.

The invention discloses an intermediate pressure level low-smoke zero-halogen flame-retardant silicon rubber insulating material and a manufacturing process thereof. The material is characterized by being prepared from the following raw materials in parts by weight: 35-45 parts of methyl vinyl organic silicon rubber, 15-25 parts of white carbon black, 1.5-3 parts of nano-montmorillonite, 10-25 parts of aluminum hydroxide, 10-18 parts of magnesium hydroxide, 0.4-0.8 part of an across-linking agent, 2-5.8 parts of a structure control agent, 2-4 parts of iron oxide red and 0.80-1.5 parts of a coupling agent. The insulating material disclosed by the invention not only can satisfy the requirements on heat resistance, high electrical insulating performance and the like of an intermediate pressure level cable insulating material, a cable accessory and the like, but also has high mechanical strength, so that the novel application field of the silicon rubber material is opened up.

The invention relates to a self-crosslinking macromolecular dust suppressant and a preparation method thereof and belongs to the technical field of environmental pollution improvement and particularly relates to the self-crosslinking macromolecular dust suppressant and the preparation method thereof. The self-crosslinking macromolecular dust suppressant is characterized by being prepared by taking styrene (St) as a hard monomer, ethyl acrylate (EA), 2-ethyl hexyl acrylate (2-EHA) as a soft monomer, introducing acrylic acid (AA) and acrylamide (AM) as a functional monomer, diacetone-acryloamide (DAAM) and adipic dihydrazide (ADH) as a self-crosslinking monomer, taking persulfate as an initiator, alkyl diphenyl ether disulfonate (DSB) as an emulsifier and allyloxyl nonylphenol ether ammonium sulfate (DNS-86) as a reactive emulsifier by virtue of a seed emulsion polymerization method. The self-crosslinking macromolecular dust suppressant provided by the invention has excellent wear resistance, water resistance, resistance to acid and base and corrosion resistance and is an environment-friendly green product.

The invention discloses mono-carboxyl chitosan / alkannin composite nanometer particles and a preparation method thereof. Alkannin coated nanometer particles are prepared through ion gel coagulation effects of water-soluble mono-carboxyl chitosan and sodium tripolyphosphate, and then mutual cross-linking and assembling of hydrophilic macromolecule addition agents and the mono-carboxyl chitosan, composite nanometer particle being small in particle diameter, homogeneous in size, high in stability and good in biological activity are prepared. The method disclosed by the invention is simple and easyto operate, low in cost, mild in reaction condition, environmentally-friendly, safe and non-toxic, the obtained composite nanometer particles are resistant to gastric acid and high in stability, andthe orally-taken absorption and utilization rate of a Chinese herbal medicine namely alkannin and the target medicine release properties are effectively improved.

Functionalized magnetic particles are emerging as a reliable and convenient technique in the purification of biomacromolecules (proteins and nucleic acids). We disclose a novel coupling procedure that can be used to create stable ferromagnetic nickel particles coated with Protein A for the affinity purification of antibody. The protein purification procedure is gentle, scalable, automatable, efficient and economical. By modifying the functional groups of amino acids in the protein coating, nickel particles can be used not only for affinity purification but for other sample preparation and chromatographic applications as well including nucleic acid isolations. The method can be easily modified for small and medium scale antibody purification in lab and pre-clinical research.

The invention relates to a rubber composition, and especially relates to an ethylene-propylene rubber composition used in a submerged pump cable rubber sheath. The submerged pump cable rubber sheath rubber composition comprises the materials of, by weight, 100 parts of EPDM, 10-15 parts of EVM (VM content being no lower than 70%), 5-10 parts of nano-scale zinc oxide, 1-2 parts of industrial stearic acid, 1-1.5 parts of an anti-hydrolysis agent P-50, 1-1.5 parts of a silane coupling agent A-172, 100-120 parts of silane-modified calcined clay, and 4.5-5.5 parts of a peroxide vulcanizing agent. The materials in the above proportion are subjected to mixing, open-milling, straining, tabletting, and slicing or granulating, such that the rubber composition is obtained. The composition provided by the invention has high temperature-resistance grade. With the rubber composition, various performance requirements of export submerged pump cable can be satisfied.

The invention relates to a polycarbonate composite material with low heat release and low smoke, which is characterized in that the composite material is prepared from, by mass, a, 70-90% of polycarbonate; b, 3-10% of organic silicon material; c, 1-7% of promoter containing transition metal; d, 1-7% of molybdenum-containing compound; and e, at most 5% of other auxiliaries; wherein a total mass percentage of the five components a, b, c, d and e is 100%; by selecting a monomer with a specific structure and preferably selecting a proportion thereof, and modifying the polycarbonate material by using polyborosiloxane with the specific structure and a specific branching degree, the flame-retardant performance of prepared polycarbonate composite material reaches a level of V-0 of UL94@3mm, and the smoke density (Ds-4)<120, a heat release rate (MAHRE)<60kW / m2; in the preferred embodiment of the invention, the smoke density (Ds-4)<100), the heat release rate (MAHRE)<50kW / m2, the light transmittance is above 82%. Therefore, the polycarbonate composite material is suitable for flame retardant and fireproof materials inside vehicles (such as airplanes, trains and automobiles).

The invention relates to the field of blanket preparation and discloses a process for producing a Lyocell flame-retardant fiber Raschel blanket. The process comprises the following steps: 1) weaving, namely sequentially warping, weaving and cutting tufted yarns and base yarns, thereby obtaining a Lyocell flame-retardant fiber semi-finished Raschel blanket; 2) performing preliminary finish, namely setting, brushing, lustering and rolling the fabric; 3) dyeing and finishing, namely dyeing the fabric, performing reduction clearing on the fabric, neutralizing by acetic acid solution, washing and taking out of the jar, drying, steaming and color-fixing, softening and smoothing, and finally drying again; 4) performing after-finishing, namely drying and setting the fabric, performing front lustering, front brushing, front ironing and shearing, back fuzzing, back brushing, back lustering, back shearing, re-setting, front ironing and shearing, back ironing and shearing and slice stitching; and 5) inspecting the finished product, packaging and warehousing. The Lyocell flame-retardant fiber Raschel blanket disclosed by the invention is soft, stiff and elastic in fluff and skin-friendly, moisture-absorbing / desorbing and breathable in fabric and has the characteristics of being antibacterial, healthy, green and environmentally friendly.

A cable comprising an electrical conductor with insulating and protecting layers surrounding the conductor is described. The cable is characterised in that at least one layer selected from said insulating and protecting layers consists of a crosslinked ethylene-alkyl (meth)acrylate-unsaturated silane terpolymer composition wherein the alkyl (meth)acrylate comonomer comprises more than 5 mole % and the terpolymer composition has a tensile modulus, determined according to ISO 527-2 (1 mm / min) of less than 100 MPa. Preferably, the crosslinked ethylene-alkyl (meth)acrylate polymer is a moisture curable ethylene-alkyl (meth)acrylate-vinyl trialkoxysilane terpolymer, wherein the trialkoxysilan termonomer comprises 0.2-5% by weight of the polymer composition. The polymer composition may include from 0 up to 50% by weight of a plasticiser, up to 60% by weight of a filler, and up to 10% by weight of an additive.

The invention discloses a method for preparing fish balls. The method comprises the following steps: preparing fish, taking the fish meat, bleaching, blending, preparing seasonings, shaping and cooking. The method is characterized in that sea cucumber essence, agar ester and starch are added after the bleaching step, and subsequently the blending step is performed; after the blending step and before the step of preparing the seasonings, protein complex phosphoesterasum is added and uniformly stirred for incubation, so that a composite raw material can be prepared from minced fillet protein in minced fillet, agar ester, sea cucumber essence and starch, and intramolecular and intermolecular cross-linking and coating of minced fillet protein, sea cucumber protein of sea cucumber essence, sea cucumber polysaccharide of sea cucumber essence and sea cucumber saponin of sea cucumber essence with sea cucumber saponin coating can be achieved. The method has the technical effects that not only is the taste improved, but also the influence to human body health caused by high salt is avoided; due to catalysis of the protein complex phosphoesterasum, the complex phosphoesterasum can be cross-linked and coated with protein in fish meat, and the elastic flavor and the nutrition of the minced fillet are further improved; the agar ester has functions of improving the immunity and preventing viruses, and sulfated polysaccharide can be relatively easily cross-linked with protein.

The invention relates to a self-crosslinking macromolecular dust suppressant and a preparation method thereof and belongs to the technical field of environmental pollution improvement and particularly relates to the self-crosslinking macromolecular dust suppressant and the preparation method thereof. The self-crosslinking macromolecular dust suppressant is characterized by being prepared by taking styrene (St) as a hard monomer, ethyl acrylate (EA), 2-ethyl hexyl acrylate (2-EHA) as a soft monomer, introducing acrylic acid (AA) and acrylamide (AM) as a functional monomer, diacetone-acryloamide (DAAM) and adipic dihydrazide (ADH) as a self-crosslinking monomer, taking persulfate as an initiator, alkyl diphenyl ether disulfonate (DSB) as an emulsifier and allyloxyl nonylphenol ether ammonium sulfate (DNS-86) as a reactive emulsifier by virtue of a seed emulsion polymerization method. The self-crosslinking macromolecular dust suppressant provided by the invention has excellent wear resistance, water resistance, resistance to acid and base and corrosion resistance and is an environment-friendly green product.

The invention discloses PET transparent flame-retardant masterbatches for a film. The masterbatches comprise the following raw materials in percentages by mass: 80-86% of chemically modified PET resin, 8-12% of polyborosilicane, 3-5% of a smoke suppressant, 0.5-2% of a hydrolysis resisting agent, 0.2-1% of an antioxidant, 0.5-1% of a nucleating agent and 0.2-1% of a lubricating agent. According tothe provided PET masterbatches, reactive fire retardant phenyl dichloro sphosphineoxid (BPOD) is introduced into a PET macromolecular main chain by chemical modification, the prepared PET masterbatches have excellent fire retardancy, good mechanical property, processability and transparency can further be maintained, the comprehensive property is excellent, even if the masterbatches are in a solvent and / or ultrasonic vibrating condition for a long time, excellent flame retardancy can still be maintained, and therefore, the masterbatches are particularly suitable for the field in which products still have excellent fire retardancy after being stored for a long time under certain specific conditions (such as solvent, friction and vibration). The PET masterbatches can further be processed and prepared into the PET film, the thickness of the film is 100-150 mu m, and the application range of the PET masterbatches is expanded.

The invention relates to a preparation method of aluminum adsorbent particles suitable for extracting lithium from original brine and old brine of a salt lake. The adsorbent particles are prepared by taking a water-absorbing polymer as a carrier, adding aluminum adsorbents such as lithium aluminum hydrotalcite, magnesium aluminum hydrotalcite and aluminum hydroxide with high loading capacity and carrying out secondary cross-linking. The preparation process is simple and suitable for industrial production. The prepared aluminum adsorbent particles have the characteristics of high elasticity, porosity, high water absorption, good permeability and the like. A resin matrix is resistant to strong acid and strong alkali, a polyhydroxy structure on the surface of the matrix can effectively adsorb adsorbent particles, and the solution loss rate is effectively reduced. The method can be applied to extraction of lithium elements in salt lake raw brine, old brine, seawater and underground water resources, and meanwhile the high-strength particles are suitable for an industrial adsorption column process.

The invention discloses a decontaminating sebum-removing hair cleaner with humic acid and a preparation method thereof, and belongs to the technical field of daily cosmetics. The decontaminating sebum-removing hair cleaner with humic acid mainly comprises a humic acid surfactant, ammonium laureth sulfate, alkyl glycosides, flavonoid plant extracts, aloe gel juice, vitamin C, konjac glucomannan andthe like; the components have a synergistic effect, so that the sebum can be effectively controlled, the sebum from the hair cortex can be effectively relieved, the hair is bright and soft, and the problems of scalp itching and bacterial growth are solved; after the shampoo sewage resulted from using of the cleaner is discharged to a river, humic acid plays a complexing role and can assist in degrading other additives which are refractory to degradation, so that the cleaner is environmentally friendly and reliable. The preparation method is simple to perform, the raw materials are easy to obtain, the cost is low, the sources are natural, safe and pollution free, and the preparation method is suitable for batch production and large-scale popularization.

The invention discloses a method for improving functional characteristics and antioxidation activity of alpha-lactalbumin. The method takes alpha-lactalbumin as a raw material, and comprises the following steps: regulating the reaction pH value; then adding ferulic acid as a cross-linking agent; then adding laccase; performing enzyme cross-linking reaction under a certain temperature condition; performing enzyme deactivation treatment after enzyme reaction ends; and finally performing freeze drying to obtain a modified alpha-lactalbumin product. A novel alpha-lactalbumin functional base material with good gel property and antioxidation activity can be directly prepared by the method, and the application area of the alpha-lactalbumin in the food industry is extended.

The invention provides an anti-fragmentation preparation method of monolithic aerogel glass. The preparation method comprises the following steps: adding an organic solvent into polyvinyl alcohol, dispersing, and completely drying at a certain temperature; weighing a proper amount of dried polyvinyl alcohol, and dissolving the polyvinyl alcohol in a dimethyl sulfoxide aqueous solution at a high temperature; taking orthosilicate and deionized water as raw materials and concentrated hydrochloric acid as a catalyst, adjusting the pH value to 1-4, and standing at a constant temperature for a certain time to obtain silica sol; heating silica sol to a relatively high temperature, adding the silica sol into the dissolved polyvinyl alcohol while the silica sol is hot, uniformly stirring, and cooling to room temperature to form a prepolymer; putting the prepolymer into a low-temperature freezing chamber, carrying out freezing-unfreezing circulation for 3-7 times, and immersing the prepolymer into dimethyl sulfoxide containing a small amount of ammonia water until the prepolymer is completely transparent; and finally, carrying out supercritical drying or freeze drying to obtain the complete non-fragmentation aerogel glass. The transparent polyvinyl alcohol gel and the silicon dioxide gel form a network mutual insertion structure so that the framework strength of the silicon dioxide gel is enhanced, and the gel is prevented from being broken in the drying process.

A process for preparing new type of TPO includes obtaining seed masterbatch made of polypropylene, ethylene-octene copolymerized elastomer styrene-butadiene-styrene ternary block copolymer, valcanizing agent, cross-linking agent by dynamic valcanizing and cross-linking in scrow extrudor; adding nanotalcum powder and assistants; extruding and pelletizing.

The invention relates to the technical field of non-stick pan coatings, in particular to a non-stick pan coating based on an interpenetrating network structure. The non-stick pan coating is formed by mixing an epoxy resin system and a polyurethane resin system according to a mass ratio of (5-7):(2-3), wherein the epoxy resin is prepared from the following components in parts by mass: 30 to 50 parts of alicyclic epoxy compound, 80 to 90 parts of glycidyl amine type resin, 3 to 5 parts of modified carbon fiber, 2 to 5 parts of pentaerythritol tetra (3, 5-di-tert-butyl-4-hydroxyhydrocinnamate), 3 to 5 parts of zirconia ceramic, 11 to 12 parts of aluminum oxide ceramic, 10 to 15 parts of zinc oxide ceramic, 13 to 17 parts of silicon nitride ceramic and 2 to 5 parts of polyethylene wax. According to the invention, the coating has a uniform resin crosslinking system and can be tightly connected with filled zirconia ceramic, alumina ceramic, zinc oxide ceramic and silicon nitride ceramic, so that the prepared coating can maintain the high-temperature-resistant effect of epoxy resin and the elasticity of polyurethane, is good in stability at high temperature, can adapt to the high-temperature swelling effect of a pot body, can be used as a coating for the pot body, and improves the integrity of the non-stick pan.

The invention provides a method for repeatedly extracting purified water by using a hyaluronic acid-graphene oxide loaded polyvinyl alcohol sponge as forward osmosis drawing substance, and belongs tothe technical field of environmental pollution control engineering. A hydrophilic compression-resistant sponge is used as the forward osmosis drawing substance, and is applied to a forward osmosis process; water is drawn with a technique; the water production rate is high; and a regeneration method is simplified. The drawing substance prepared in the method keeps a higher water flux as the structural characteristic of the drawing substance can completely avoid reverse osmosis. In addition, based on a PVA substrate excellent in mechanical performance, the irreversible deformation of the drawingsubstance can be greatly relieved; and the service life of drawing substance is prolonged. The drawing substance is regenerated and regeneration and water production procedures can be completed within a short time by only needing simple mechanical compression. A substrate material is low-cost, is easy to obtain, and can be produced on a large scale, which is beneficial to the large-scale preparation and wide application of the drawing substance.

The invention discloses a preparation method and application of a modified lignin-based gel water shutoff agent, and the preparation method comprises the following preparation steps: step A, putting a lignin raw material into a reaction container, uniformly stirring, adding a carboxymethylation modification reagent, and reacting for a period of time at a certain temperature; step B, adding an epoxy modification reagent, and reacting for a period of time at a certain temperature; c, adding a polyvinyl alcohol solution, uniformly stirring, and cooling; and D, adding a cross-linking agent to adjust the concentration, uniformly stirring, transferring into a high-temperature-resistant pipe or a high-temperature-resistant tank, putting into an electrothermal blowing dry box, and reacting at 100-200 DEG C to form gel, thereby obtaining the modified lignin-based gel water plugging agent. The lignin is subjected to chemical modification, the modified lignin contains carboxyl and epoxy groups at the same time and then acts with the cross-linking agent and the like, the lignin is cured into gel at high temperature, the temperature-resistant and salt-resistant water shutoff agent is formed, the modified lignin is easy to cross-link, the strength after cross-linking and curing is high, and a cured product is good in temperature resistance.

Relating to the field of leather production and manufacturing, the invention provides a washable leather finishing composition and a leather manufacturing process. The washable leather finishing composition provided by the invention comprises a coloring agent, a film-forming agent, a wax emulsion, casein, a cross-linking agent and a polysiloxane aqueous emulsion. The innovation point of the washable leather finishing composition lies in that a lot of grease and wax are added into the finishing composition, and the grease and wax can be crosslinked with the crosslinking agent, thus being conducive to improving the strength and flexibility of a finishing film, therefore the leather produced according to the invention can be washable without affecting the handfeel and color. The finishing composition is sprayed to a leather surface by a spray machine, and by means of ironing, common washing, hanging drying, milling and other procedures, the manufactured leather is washable, has the advantages of wear resistance, wet rubbing resistance, sticking resistance and good glossiness, also has high strength and silk-like feel, and is comfortable to wear.

The invention discloses an anti-corrosion and abrasion-resistant steel plastic surface pipeline. The anti-corrosion and abrasion-resistant steel plastic surface pipeline comprises a steel pipe and a liner pipe arranged in the steel pipe. The liner pipe comprises the following raw material compositions, by weight, 100 parts of ultrahigh molecular weight polyethylene, 1-5 parts of polypropylene, 2-4parts of 2,5-Di-(tert-butylperoxy)-2,5-dimethyl-3-hexyne, 1-4 parts of alkenyl-containing siloxane, 1-3 parts of sulfur dioxide and 5-10 parts of fillers. The ultrahigh molecular weight polyethyleneliner pipe is adopted for the anti-corrosion and abrasion-resistant steel plastic surface pipeline, not only are properties such as the corrosion resistance, the abrasion resistance, the high-temperature resistance and the impact strength of the liner pipe greatly improved, but also the deposition velocity of pipeline surface scale is also greatly reduced, and thus a good anti-scaling effect is realized.

The invention belongs to the technical field of a medical article, and relates to a medical composite chitosan functional dressing and a preparation method thereof. The method comprises the following steps of A, weighing a certain amount of water-soluble chitosan or salts and carboxymethyl starch or sodium starch glycolate; putting the materials into a stirring device; adding a certain amount of water; performing stirring so that the solution foams and expands to obtain a preparation solution; B, weighing the preparation solution; injecting the preparation solution into a silicon rubber mold disc; pressing a cap for sealing; then, putting the materials into a -20 DEG C refrigerator for quick freezing and forming; C, putting a quick freezing and forming product in the step B into a vacuum freeze drying machine for freeze drying; performing sterilization and packaging after the demoulding; then performing preparation to obtain the composite chitosan functional dressing. The preparation method provided by the invention has the advantages that the process is simple; the method is suitable for industrial production; the prepared composite chitosan functional dressing has high adsorption capability, high moisture preservation performance and high softness plasticity.