26results about "Chitin coatings" patented technology

The application provides a transparent fire-retardant fireproof paint and a preparation method and application thereof, and particularly relates to the technical field of fire-retardant fireproof paint. The transparent fire-retardant fireproof paint comprises, by weight fraction, 1-8 parts of water-soluble chitosan, 0.5-5 parts of gelatin, 3-10 parts of phytic acid solution, 0.1-0.8 parts of hydrophilic fumed nano-silicon dioxide, 0.1-3.0 parts of a stabilizer and 30-80 parts of water; wherein the stabilizer is a water-soluble amine compound. By introducing the water-soluble amine stabilizer into the chitosan / gelatin / phytic acid water-based transparent fire-retardant system, the low-temperature stability, compatibility and long-term storage stability of the paint system are significantly improved.

This application relates to an anti-icing coating, its preparation method, and its application, belonging to the field of protective coating technology. The anti-icing coating comprises a superhydrophobic self-cleaning coating and a hydrophobic and oleophobic layer stacked together. The superhydrophobic self-cleaning coating includes first SiO2 nanoparticles and fluorosilane. The hydrophobic and oleophobic layer includes second SiO2 nanoparticles, nanocellulose, chitosan nanoparticles, and a binder. The use of natural polymer materials such as nanocellulose and chitosan nanoparticles in the hydrophobic and oleophobic layer results in lower cost and better environmental friendliness. The superhydrophobic self-cleaning coating achieves superhydrophobic properties through the synergistic effect of a nano-dispersion system and a "papillary" micro-nano rough structure. The hydrophobic and oleophobic layer further enhances the coating's hydrophobic and oleophobic properties and surface lubricity, significantly reducing the adhesion of ice to the coating surface.

Polyhydric polymers may be converted to derivatives thereof by reaction with divinyl sulfone to provide vinyl sulfone substituted polymers, where the polymers may additionally be further derivatized, including crosslinked, and the crosslinked and non-crosslinked derivatives may be used in biomedical and other applications.

The application discloses a photonic film coating, a preparation method and application. Chitin nanowhiskers are compounded with polyvinyl alcohol to obtain the photonic film coating; the chitin nanowhiskers are extracted from shellfish waste; and the mass ratio of the chitin nanowhiskers to the polyvinyl alcohol is 0.1-1:1. The photonic film coating is low in cost, natural and non-toxic, simple in process equipment and operation, and capable of realizing rapid and large-area photonic film preparation, and can be widely applied to multiple fields such as automobile decoration, building decoration and anti-counterfeiting.

This invention discloses a method for preparing pH-responsive liquefied chitin and its application, belonging to the field of natural polymer material processing technology. Using chitin as a raw material, this invention achieves the dissolution of chitin through liquefaction treatment while retaining a high number of hydrophobic groups. The resulting liquefied chitin exhibits pH-responsive rheological properties. Compared to existing deacetylation processes, this process uses milder conditions, avoiding excessive deacetylation while reducing production costs and being more environmentally friendly. The preparation method of this invention is simple, the degree of deacetylation is more controllable, and the rheological properties of the product are more suitable for the development and application of chitin-based hydrophobic biomaterials.

The application provides a kind of irradiation sterilization processing method for silicon rubber breathing tube, comprising the following steps: S1: treatment agent is sprayed on the surface of breathing tube, after 10-30min, the breathing tube is dried, then is loaded into sterile packaging bag;S2: the sterile packaged breathing tube obtained in step S1 is irradiated, and the sterilization is obtained.The sterilization processing method of the application adopts the method of cobalt source irradiation, has high sterilization efficiency, can effectively kill bacteria and viruses.And it has a certain protective effect on materials, can effectively avoid the problems of mechanical property change, yellowing, material decomposition and other problems of material performance change after high molecular material is subjected to irradiation sterilization, and is suitable for medical devices of high molecular material, especially the irradiation sterilization processing of silicon rubber breathing tube.

The present application relates to the technical field of plastic packaging materials, and discloses an environment-friendly plastic bag and a preparation method thereof, which comprises the following steps: performing surface pretreatment on a low-density polyethylene base material through corona treatment; coating a chitosan-sodium-based montmorillonite composite inner layer barrier coating on the surface of the base material; performing crosslinking pretreatment on the inner layer coating by using citric acid to form a three-dimensional network structure; coating an alginate propylene glycol ester-chitosan grafted polymer composite intermediate transition layer to realize interface bridging; coating a nano-silver-sodium alginate outer layer antibacterial coating; respectively curing each layer of coating by using a 60 DEG C-70 DEG C-80 DEG C three-section gradient curing process; and heat sealing and forming into a plastic bag. The peeling strength of the coating is improved from below 0.5 N / cm to above 2.5 N / cm, the coating integrity is maintained above 95% in a high-humidity environment, and the technical effects of high interface bonding strength, barrier-antibacterial synergistic function and recyclable utilization are realized.

This invention provides a method for preparing an antimicrobial peptide composite material, comprising: S1 preparing a β-TCP / HyA porous substrate; S2 synthesizing mesoporous polydopamine (MPDA); S3 dispersing the β-TCP / HyA porous scaffold and the mesoporous polydopamine in deionized water for a second crosslinking reaction to form a β-TCP / HyA / MPDA composite suspension; and then adding the antimicrobial peptide KR to the β-TCP / HyA / MPDA composite suspension to induce a binding reaction, thereby obtaining the antimicrobial peptide composite material. This invention crosslinks β-tricalcium phosphate (β-TCP), hyaluronic acid (HyA), and mesoporous polydopamine (MPDA) to construct a multifunctional composite substrate that combines physical support, biocompatibility, and high-efficiency loading. The mesoporous structure of MPDA provides numerous anchoring sites for the antimicrobial peptide KR. Through MPDA adhesion and covalent fixation strategies for the antimicrobial peptide, high-density and high-activity loading of KR molecules is achieved, effectively solving the problems of easy detachment and "fixation leading to inactivation".

A grafted glycosaminoglycan polymer is disclosed. The grafted glycosaminoglycan polymer comprises a glycosaminoglycan having a polymer backbone and one or more side chains comprising a polyalkylene glycol-containing residue grafted onto the polymer backbone.

This invention relates to the field of polymer compound technology, specifically to an antibacterial food-grade plastic product for sealing and preservation and its preparation method, comprising an outer support layer and an inner antibacterial layer. The outer support layer is prepared by melt blending raw materials such as PBAT, PLA, and modified nano-calcium carbonate, wherein the mass ratio of PBAT to PLA is 90-100:10-20. The inner antibacterial layer is composed of nano-chitosan, tea polyphenols, essential oil microcapsules, glycerol, and agarose, composited on the surface of the outer support layer. The essential oil microcapsules have a core-shell structure, loading plant essential oils onto mesoporous silica as a carrier, and are coated with calcium alginate on the outer layer. The antibacterial food-grade plastic product prepared by this invention possesses long-lasting antibacterial properties, excellent mechanical properties, and heat-sealing strength, and has broad application prospects in the food packaging field.

The present application relates to an environment-friendly water-based industrial anticorrosive coating and a preparation method thereof, and belongs to the technical field of coating. The coating composition comprises chloroether resin emulsion, corrosion inhibition emulsion, barrier agent, slag composite filler, etc. The corrosion inhibition emulsion is prepared by using hexamethylcyclotrisilazane, glycidyl furfuryl ether and 2-furfurylamine in isopropyl alcohol as raw materials and tetramethylammonium hydroxide as catalyst, and then emulsified with deionized water and composite emulsifier after removing isopropyl alcohol. The barrier agent is prepared by modifying the titanium aluminum carbide sheet layer after acid stripping with 3-aminopropyltriethoxysilane. The slag composite filler is prepared by sintering blast furnace slag powder, zeolite powder and potassium dihydrogen phosphate, etching with citric acid, and then modifying with boron nitride and KH-172 silane coupling agent. The coating uses water as the dispersion medium to reduce VOC emissions, and constructs a protective system in multiple dimensions through chemical active corrosion protection, physical layered barrier, dense film formation and interface covalent bonding, and is suitable for harsh corrosion scenes such as industrial heavy-duty corrosion, ships and marine engineering.

The application provides a hydrophobic interface film composite material for inhibiting wheat ear germination and a preparation method thereof, raw materials of the hydrophobic interface film composite material comprising chitosan powder, zein, nano-silicon dioxide and a solvent; wherein the mass-volume concentration of the chitosan powder is 0.1-5%; the mass-volume concentration of the zein is 0.1-5%; and the mass-volume concentration of the nano-silicon dioxide is 0.1-3%. The hydrophobic interface film composite material is sprayed on the surface of mature wheat grains to form a hydrophobic interface film, so that the occurrence of wheat ear germination can be effectively inhibited, and the safe production of wheat can be ensured. The hydrophobic interface film composite material has a good effect of inhibiting wheat ear germination, and after spraying, the germination rate of the isolated ear can be reduced by more than 95%, and the yield and quality caused by the wheat ear germination are reduced.

The application discloses a kind of multilayer composite self-adhesive label for food packaging and preparation method thereof, it is related to label material technical field, including base paper layer, adhesive layer, surface paper layer, the base paper layer selects the kraft paper coated with silicon oil, the side of surface paper layer away from adhesive layer is coated with polyvinyl alcohol coating, and adhesive layer uses acrylate adhesive.The polyvinyl alcohol coating is arranged on the surface paper layer of self-adhesive label in the application, realizes high barrier property, solves the problem that traditional label only has identification function without protection ability, solves the problem that traditional label is easily eroded by environment, improves the adaptability of label in high humidity environment.

This invention relates to the field of food packaging and functional food technology, and discloses an edible soybean residue-based cup with preservation and health-promoting functions, and its preparation method. The cup includes a soybean residue-based preform, which is formed by extrusion injection molding from soybean residue ultrafine powder, composite starch, and pH-sensitive health-promoting microcapsules. Its inner wall is coated with an active preservation layer containing glucose oxidase, catalase, and nisin, and its outer surface is coated with a physical barrier film formed by beeswax and shellac curing. This invention improves the water resistance and structural stability of the substrate by constructing a physical barrier film on the outer wall to seal pores; it actively reduces the oxygen partial pressure inside the cup and inhibits microbial growth through the synergistic effect of the multi-enzymatic reaction and antimicrobial peptides in the inner wall preservation layer, thus extending the shelf life of the food; and it combines microcapsule technology to protect the active core material in gastric juice and target its release in the intestine, improving the bioavailability of the health-promoting components.

The application discloses a degradable antibacterial anti-fog fresh-keeping composite packaging material and a preparation method thereof. The method comprises the following steps: melt blending polylactic acid, a compatilizer, a plasticizer and a processing aid to obtain a degradable base film by casting; dissolving a hydrophilic film-forming polymer in water, adding a crosslinking agent and an antibacterial active component to prepare an anti-fog antibacterial functional liquid; and coating the functional liquid on the surface of the base film, and drying and curing to obtain the composite packaging material. In the material, the hydrophilic film-forming polymer and the crosslinking agent form a crosslinking network, which endows the coating layer with durable anti-fog property and adhesion stability, and the antibacterial active component is uniformly dispersed in the network, and the inhibition rate of the antibacterial active component on escherichia coli and staphylococcus aureus can reach more than 99%. The composite packaging material prepared by the application has the properties of degradability, high light transmittance, long-acting anti-fog property and broad-spectrum antibacterial property, can effectively delay the weight loss and rot of perishable foods such as strawberries, and is suitable for high-humidity cold storage fresh-keeping packaging of fresh fruits and vegetables, edible fungi and cold fresh meat.

This invention relates to a high-barrier coating liquid, a packaging film, and their preparation method and applications, belonging to the field of biodegradable packaging materials technology. It solves the problems of existing packaging materials being generally non-degradable, highly dependent on petroleum-based resources, and the difficulty of simultaneously achieving high transparency, high barrier performance, and high environmental stability in existing single-material packaging systems. The high-barrier coating liquid provided by this invention comprises 1-10 parts of natural polysaccharide, 0.1-5 parts of a polyvalent metal ion compound, 0.5-5 parts of a bio-based plasticizer, and 80-98 parts of water. The bio-based plasticizer is added to the natural polysaccharide solution to obtain a polysaccharide solution. The polysaccharide solution is mixed with an aqueous solution of the polyvalent metal ion compound, and stirred to carry out a coordination crosslinking reaction to obtain the high-barrier coating liquid. The high-barrier coating liquid is coated onto the surface of a substrate layer, dried, and cured to obtain the packaging film. The packaging film provided by this invention can be applied to the aseptic packaging of pharmaceuticals, food, or medical devices.

This invention provides a chitosan-based edible film with a nano-network structure, its preparation method, and its application. The preparation method includes the following steps: 1) Adding zein to water, adjusting the pH, and then adding a phosphorylation reagent to obtain a mixed solution. After dialysis, centrifugation is performed, and the supernatant is freeze-dried to obtain phosphorylated zein nanoparticles; 2) Adding microcrystalline cellulose to FeCl3·6H2O solution, heating in a water bath, vacuum filtering, washing the precipitate until white, and freeze-drying the obtained precipitate to obtain cellulose nanocrystals; 3) Preparing a coating solution: Adding the phosphorylated zein nanoparticles and cellulose nanocrystals to a chitosan hydrochloride solution to obtain a coating solution; 4) Adding a plasticizer to the coating solution, ultrasonically degassing, and then pouring the mixture onto an acrylic plate to naturally form a film, thus obtaining an edible film. The chitosan-based edible film prepared by this invention can be used to reduce cherry cracking when exposed to rain. It is safe and non-toxic and has high market value.

This invention relates to a flexible bio-based phase change pressure heating material, its preparation method, and its application. In a first aspect, the invention provides a flexible bio-based phase change pressure heating material comprising a phase change pressure heating composite layer and a first encapsulation layer and a second encapsulation layer covering the upper and lower sides of the composite layer. The phase change pressure heating composite layer is composed of a flexible support layer and a phase change pressure heating core layer loaded within the flexible support layer by a vacuum impregnation method. The phase change pressure heating core layer is composed of a bio-based phase change core and a conductive control network. The bio-based phase change core is a silk fibroin and polyethylene glycol composite system, and the conductive control network is Ti3C2T. x The material comprises an MXene-carboxylated carbon nanotube composite system; a flexible support layer made of freeze-dried bacterial cellulose aerogel; and two encapsulation layers, both composed of chitosan and hyaluronic acid composite films. This phase change pressure thermostat material features low pressure triggering, high flexibility, high biocompatibility, and precise thermal regulation.

This invention discloses a spherical-surface phase change coating for deep-earth oil pipelines and its preparation method. The steps are as follows: MXene powder and nanocapsules are modified with a modifier; the modified MXene powder and nanocapsules are mixed to undergo crosslinking or condensation reactions to form a composite filler with a three-dimensional interpenetrating "spherical-surface" composite structure; the composite filler is mixed and stirred with a binder and a curing agent to obtain a homogeneous coating; the homogeneous coating is sprayed onto the surface of a substrate, and after curing, a spherical-surface phase change coating with frictional heat management and corrosion protection functions is obtained. This invention constructs a spherical-surface phase change filler network by in-situ composite formation of phase change microcapsules loaded with corrosion inhibitors and MXene materials. When the coating is under frictional conditions, the microcapsule core material undergoes a solid-liquid phase change, alleviating coating failure caused by frictional heat accumulation. When the coating is damaged, some microcapsule shells rupture, allowing the loaded corrosion inhibitor to be continuously released, giving the coating an adaptive corrosion protection capability.

This invention belongs to the field of food preservation and functional coating technology, and relates to an anti-fogging preservation coating and its preparation method. The coating uses chitosan modified by Schiff base crosslinking with tea polyphenols as the main film-forming material, and introduces glycerol as a synergistic component. It is also compounded with film-forming aids, plasticizers, surfactants, and preservatives to form a transparent and stable coating. The modified chitosan constructs a ternary crosslinking structure with tea polyphenols and terephthalaldehyde, which not only improves the material's antioxidant and antibacterial properties but also avoids the toxicity problems associated with traditional crosslinking agents. The resulting coating exhibits excellent transparency and anti-fogging properties, with a light transmittance of over 90%. The anti-fogging clarity recovery time is significantly shortened, effectively extending the shelf life of fruits and vegetables. The coating of this invention shows significant advantages in transparency, anti-fogging, antioxidant properties, and shelf life, and is green, safe, widely applicable, and has industrialization potential.

This invention relates to the field of anti-fingerprint coating technology, and particularly to the hydrophobic and oleophobic modification of anti-reflective coatings based on porous structures and their anti-fingerprint applications. The method includes the following steps: First, a chitin nanofiber (ChNFs) suspension is prepared; then, methyltrimethoxysilane (MTMS) is introduced as a crosslinking agent, and MTMS-crosslinked ChNFs coatings with different water contents are placed in a gradient freezing temperature environment for treatment. This causes the chitin nanofibers to form a multi-nanoporous structure due to ice crystal repulsion, resulting in a substrate coated with a chitin nanofiber-based anti-reflective coating; subsequently, a vapor deposition method is used to modify the coating with perfluorodecyltriethoxysilane as a low-surface-energy modifier to achieve hydrophobic and oleophobic properties, thus imparting anti-fingerprint functionality while maintaining the anti-reflective properties. The single-layer anti-reflective coating of this invention achieves integrated functions of "high-efficiency anti-reflection, anti-fingerprint, environmentally friendly, and stable and durable," while providing a feasible and scalable technical path for the controllable preparation of high-performance composite coatings.

This invention relates to the field of medical device technology, specifically disclosing a glass slide for blood testing and its preparation method. The invention constructs a highly cross-linked multilayer composite coating on the glass slide, enhancing the overall mechanical strength and cohesion of the coating. The alternating adhesion-antibacterial structure overcomes the limitations of traditional single coatings in terms of function and stability. This ensures that cells can be effectively adhered and captured while maximally inhibiting bacterial growth and interference, thereby significantly improving the accuracy of blood testing.

The present invention relates to a process for preparing a coating lacquer comprising the following steps: a) providing a natural hydrocolloid and a solvent, the solvent comprising or consisting of water, b) introducing, under stirring, the natural hydrocolloid into the solvent to obtain a pre-hydrolysis solution, the natural hydrocolloid having a concentration ≥ 13% by weight of the total weight of the pre-hydrolysis solution, c) reaching a temperature comprised between 40°C and 57°C, d) introducing a hydrocolloid-specific hydrolyzing enzyme to obtain a coating lacquer, wherein the coating lacquer has a natural hydrocolloid concentration ≥ 13% by weight of the total weight of the coating lacquer.

This invention discloses a method for preparing and applying a mildew-proof and flame-retardant composite coating for bamboo. In the preparation method, the quaternary composite core material solution uses phytic acid–Fe²⁺. + The quaternary synergistic core material system composed of tannic acid–PG-CS organically integrates natural flame retardant components, metal ion synergists, plant polyphenol antifungal agents, and polymeric antibacterial carriers, not only through Fe² + Complexing with phytic acid promotes high-temperature char formation and improves flame retardant efficiency; Fe²⁺ is also utilized. + The oxidative stress effect and the antibacterial effect of tannic acid / PG-CS achieve long-lasting broad-spectrum antifungal properties; at the same time, by precisely controlling the reaction pH of the core material, Fe²⁺ is effectively inhibited. + Oxidative deactivation ensures functional stability. The prepared anti-mildew and flame-retardant microcapsules have a tight core wall and good dispersibility. When combined with waterborne polyurethane, they can improve the flame-retardant properties of the composite material while maintaining good mechanical properties.

The disclosure provides for compositions and methods of preserving lymphatic phenotype where the composition comprises a polymer comprising hyaluronic acid and dopamine, wherein about 20% to about 60% of the hyaluronic acid is functionalized with the dopamine, wherein the dopamine is covalently bonded to the hyaluronic acid.

This application relates to a modified chitosan coating for enhancing adhesion to fruit surfaces and resisting fungal spores, and a method for preparing the same. The modified chitosan coating comprises a chitosan-tannic acid-stearic acid copolymer, a plasticizer, and water. The copolymer is modified by grafting tannic acid and stearic acid onto a chitosan backbone. The modified chitosan coating exhibits enhanced adhesion and hydrophobicity to hydrophobic fruit surfaces, improves wettability, reduces swelling under high humidity, enhances gas barrier properties, displays significant antioxidant activity, reduces enzymatic browning and scavenges free radicals, exhibits anti-adhesion against fungi and bacteria, and possesses excellent biocompatibility. It provides a promising, safe, and sustainable solution for extending the shelf life and quality of fresh agricultural products.