151results about "Chitin coatings" patented technology

The invention discloses an antibacterial sanitary towel packaging bag and a preparation method thereof. The antibacterial sanitary towel packaging bag comprises a base material layer, an antibacterial layer and a leakage-proof layer. The base material layer is prepared by blending modified polylactic acid, polybutylene adipate and the like and contains a degradation accelerant; the antibacterial layer contains antibacterial peptide-loaded nano montmorillonite, chitosan and the like, and loofah sponge fiber enhances slow release; and the leakage-proof layer is an ethylene-vinyl acetate copolymer and modified silicon dioxide blended film and is provided with breathable micropores. The preparation method comprises the steps of forming the base material layer, coating the antibacterial layer and the like, and process parameters of each layer are accurately controlled. According to the packaging bag, through cooperation of three layers, the bacteriostasis rate of the packaging bag on escherichia coli and staphylococcus aureus in 24 hours is higher than 99%, the degradation rate of the packaging bag in 83 days is higher than 88%, the oxygen permeability is 4.5-5.2 cm < 3 > / (m224h 0.1 MPa), and the packaging bag has the advantages of long-acting antibiosis, air permeability, leakage prevention, environmental protection, degradation and good mechanical properties, and meets the storage and use requirements of sanitary napkins.

The invention discloses a slow-release antibacterial and antioxidant composite preservative film and a preparation method thereof. The slow-release antibacterial and antioxidant composite preservative film is prepared from a chitosan matrix and Chuzhou chrysanthemum essential oil nano-emulsion loaded in the chitosan matrix, the Chuzhou chrysanthemum essential oil nano-emulsion comprises Chuzhou chrysanthemum essential oil, a surfactant and a cosurfactant, and the average particle size of the Chuzhou chrysanthemum essential oil nano-emulsion is smaller than 200 nm; the composite preservative film has the function of slowly releasing the Chuzhou chrysanthemum essential oil and shows antibacterial and antioxidant activity; the preparation method comprises the following steps: firstly preparing Chuzhou chrysanthemum essential oil into a nano-emulsion by adopting a nano-encapsulation method through a high-pressure homogenization method to form the Chuzhou chrysanthemum essential oil nano-emulsion, then embedding the Chuzhou chrysanthemum essential oil nano-emulsion into chitosan to prepare an active chitosan composite film, and finally applying the antibacterial coating material to food preservation. The antibacterial coating film not only can effectively inhibit pathogenic microorganism infection in berry storage and logistics transportation in a wider spectrum, but also can regulate physiological metabolism of picked berries, delay the senescence process and reduce loss of internal moisture.

The invention belongs to the technical field of biological fouling protection, and particularly relates to an environment-friendly adhesive hydrogel antifouling coating which is prepared by the following steps: grafting a catechol group to an acryloyl compound with double bonds through acylation reaction to obtain a dopamine-acrylamide compound; the preparation method comprises the following steps: carrying out copolymerization reaction on an acrylamide derivative and a dopamine-acrylamide compound in a water environment to obtain an acrylamide derivative copolymer; and mixing the chitosan and the acrylamide derivative copolymer to obtain the environment-friendly adhesive hydrogel antifouling coating. According to the invention, polyacrylamide and catechol are introduced into a chitosan system at the same time to form a chitosan-polyacrylamide-catechol ternary synergistic network, and the chitosan-polyacrylamide-catechol ternary synergistic network has the effects of self-repairing, high toughness, strong adhesion and intelligent response.

The invention relates to the field of biomimetic materials, in particular to a biomimetic self-cleaning anti-fouling aquaculture net cage material, a preparation method and application of the biomimetic self-cleaning anti-fouling aquaculture net cage material. 0.5 to 2.0 parts by weight of a carboxylated graphene nanosheet; 2.0 to 5.0 parts by weight of nitrogen-doped titanium dioxide nanoparticles; 1.0 to 3.0 parts by weight of silica nanoparticles; 5.0 to 10.0 parts by weight of calcium ion cross-linked modified sodium alginate; 1.0 to 3.0 parts by weight of octadecyl trichlorosilane; 0.5 to 1.5 parts by weight of lauryl sodium sulfate; through the synergistic effect of a double bionic structure and enhanced photocatalysis, the effective inhibition on attachment of various organisms is realized, and the inhibition rate on attachment organisms such as algae, bacteria and barnacles reaches 75% or above.

The invention relates to the technical field of medicine packaging materials, and discloses a preparation technology of a high-barrier-property composite film for medicine. Comprising the steps of preparation of a degradable base material, coating of a bio-based pressure-sensitive adhesive, distribution of a gradient inhibitor, interface ion exchange activation, construction of an ion immobilization network, temperature and humidity gradient control curing, formation of a phase interface dehydration protection layer and the like. Through a dual action mechanism of pressure-sensitive adhesion and ion exchange and a synergistic effect of biological activity inhibition and ion migration blocking, efficient compounding of a degradable base material and an inorganic barrier layer is realized, and the technical problems of both environmental protection property and high barrier property, attenuation of interface bonding stability and long-term use performance and the like are solved.

The invention discloses a full-biodegradable bamboo fiber film material and a preparation method thereof. The full-biodegradable bamboo fiber film material is composed of a bamboo fiber composite matrix, a biodegradable reinforcing system and a multifunctional cross-linking agent. The bamboo fiber composite matrix is a mixture of bamboo pulp fiber pretreated by supercritical CO2 and microcrystalline cellulose; the biodegradation enhancing system is composed of nano calcium carbonate-montmorillonite composite particles and a polylactic acid-glycolic acid copolymer, and the composite particles are modified by a silane coupling agent; the multifunctional cross-linking agent is an esterification product of citric acid and glycerol. The preparation method comprises the steps of bamboo fiber supercritical pretreatment, composite reinforced particle preparation, melt extrusion, two-way stretching, gradient heat setting and the like, and finally the antibacterial surface layer is formed through chitosan surface treatment. The material realizes the balance of biodegradability and mechanical properties through raw material synergy and process optimization, and is suitable for the fields of packaging, agricultural coverage and the like.

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a carbon-coated aluminum foil coating and a preparation method thereof. The invention aims to solve the problem of contradiction between high conductivity and strong adhesive force of the current carbon-coated aluminum foil coating. According to the invention, a multi-stage dimensional composite conductive network is taken as a design core, and the conductive performance of the coating is improved through a ternary composite system formed by conductive carbon black, one-dimensional carboxylated multi-walled carbon nanotubes and two-dimensional sulfonated graphene oxide; the binder adopts a bio-based water-based system and is formed by compounding carboxylated cellulose nanocrystals and quaternized chitosan, and a compact and tough bonding network layer is formed through electrostatic interaction and hydrogen bond combination; the conductive adhesive is excellent in conductivity and strong in adhesive force, the preparation process is environment-friendly and efficient, and the contradictory problem that the conductivity and the adhesive force are difficult to consider at the same time in the prior art is solved.

The invention aims to provide a preparation method and application of a CMC / PVA active packaging film coated with chitosan-tannic acid on the surface, and belongs to the field of food preservation. Comprising the following steps: firstly, preparing a CP40 film, and then preparing a CP40 / CT% composite film: preparing a chitosan solution with the mass concentration of 1%, adding tannic acid TA into the chitosan solution, stirring for 30 minutes in a shading manner at room temperature to form a CT coating solution, flatly laying the prepared CP40 film on a planar carrier, coating the surface of a substrate film with the CT coating solution, and putting the composite film and the carrier into a drying oven at 45 DEG C for constant-temperature drying, so as to obtain the CP40 / CT% composite film. And after the solvent of the coating layer is completely volatilized, taking out and stripping to obtain the CP40 / CT% composite film. Under the action of hydrogen bonds and electrostatic attraction, a compact network structure of an amorphous-weak crystal region is formed in the composite film, so that the interface bonding strength of the film is enhanced, and the rigidity and flexibility of the film are balanced. The physical and chemical properties and biological activity of the composite membrane are synergistically optimized, and the composite membrane has obvious degradation signs after being buried in soil for 35 days and belongs to a biodegradable material.

The invention relates to the technical field of haloxylon ammodendron forest rejuvenation in an arid region, in particular to a degenerated haloxylon ammodendron forest stumping, updating and rejuvenating method which comprises the following steps: (1) performing stumping treatment on target plants from late February to mid-March in early spring; (2) applying a composite modifier within 1-3 days after stumping; (3) carrying out periodic moisture regulation and control within 1-2 days after the composite modifier is applied; and (4) after the water regulation is finished, covering the base part of the plant with a mixed covering. The method solves the problem that in the prior art, only rejuvenation of the overground part is emphasized, but the health of the underground root system is neglected, the apparent quality of the haloxylon ammodendron forest can be improved, and the long-term stress resistance and ecological adaptive capacity of plants are remarkably improved.

The invention provides a chitosan-containing coating liquid, a preparation method and an application of the chitosan-containing coating liquid in a packaging material, and relates to the field of packaging materials. The preparation method of the chitosan-containing coating liquid comprises the following steps: carrying out composite modification; the composite modification method comprises the following steps: dropwise adding a pre-oxidized dextran solution into a carboxymethyl chitosan solution, and adjusting the pH value to 7; continuously stirring and dropwise adding the mixed precursor solution to obtain a mixed solution; and reacting the mixed solution in an intermittent microwave environment at 57-60 DEG C, centrifugally washing, and uniformly mixing and dispersing with deionized water and glycerol to obtain the chitosan-containing coating solution. According to the chitosan-containing coating liquid disclosed by the invention, the mechanical strength and brittleness of a film layer after the coating liquid is coated to form a film can be effectively improved; the problems that a film layer is poor in water resistance and easy to swell and lose efficacy in a water-containing environment or a humid environment are solved; the antibacterial spectrum of the film layer is further widened, and the antibacterial property, antibacterial durability and oxygen barrier property of the film layer are improved.

The invention relates to the technical field of environment-friendly materials, in particular to an environment-friendly degradable composite material which comprises a natural cellulose base material, modified nanofiller, a bio-based plasticizer, a cross-linking agent and a coating layer of chitosan and silver nanoparticles. The preparation method comprises the steps of mixing dispersion, ultrasonic treatment, hot press molding, surface coating, ultraviolet activation and the like. By optimizing components and process parameters, the defects of an existing material in the aspects of degradation performance, functional diversity and long-term stability are overcome, good degradability, excellent antibacterial performance and stability under high-temperature and high-humidity conditions of the material in different environments are achieved, and the material is suitable for various scene requirements.

According to an example aspect of the present invention, there is provided an intumescent fire retardant composition comprising: an acid source comprising or consisting of ammonium phytate; and a carbon source selected from the group consisting of: carbohydrates, chemically modified lignins, tannin, and any combinations and derivatives thereof.

The invention provides an antifouling compound, a preparation method thereof and a marine antifouling paint, and the preparation method of the antifouling compound comprises the following steps: loading a carboxylic acid natural antifouling agent on aminated porous silicon oxide to obtain an aminated porous silicon oxide antifouling agent; mixing the aminated porous silicon oxide antifouling agent with chitosan in a solution to obtain a mixed solution; and coating the mixed solution on the surface of the substrate covered with the zinc oxide nanorods, and drying to obtain a target product. The antifouling compound obtained by adopting the preparation method shows excellent antibacterial activity and an outstanding antifouling effect, and the antifouling compound also has relatively high safety.

The invention relates to the technical field of medical textile materials, in particular to an anti-static medical fabric and a preparation method thereof.The anti-static medical fabric comprises an outer layer, a middle layer, an inner layer and carbon fiber grids embedded into the outer layer and the inner layer, the outer layer is made of nanofibers prepared by electrostatic spinning and comprises polyvinylidene fluoride, an F-ZnO / TiO2 composite antibacterial agent, carboxylated carbon nanotubes and grafted quaternary ammonium salt; the middle layer is a chitosan enhanced polytetrafluoroethylene film, and the surface of the middle layer is sequentially coated with a chitosan / silk fibroin transition layer and a polypyrrole conducting layer; the inner layer is a blend fiber fabric and comprises hollow polyester fibers, chitosan microsphere modified cotton fibers and carbon nanotube grafted polyamide fibers; the carbon fiber grids are embedded into the outer layer and the inner layer in a warp knitting mode with the density of 20-24 pieces / cm. According to the antistatic fabric, a four-stage conductive network is formed by the outer-layer carbon nanotubes, the middle-layer polypyrrole, the inner-layer grafted carbon nanotubes and the carbon fiber grids, so that the antistatic performance of the fabric is greatly improved.

The utility model provides a glucose biosensor, and relates to the technical field of medical detection. The glucose biosensor comprises a sensing module, a circuit board and a charging wire; a microprocessor, a rechargeable battery and a charging connection structure are arranged on the circuit board; the charging connection structure comprises a first composition part and a second composition part; the first composition part is fixedly arranged on the circuit board and is electrically connected with the rechargeable battery; the second component part is rotatably and electrically connected with the first component part; one end of the charging wire is provided with a connecting part, and the other end is provided with a seat body; the connecting part is detachably and electrically connected with the second composition part; and a solar charging panel and a wireless charging coil are arranged on the seat body. The glucose biosensor has multiple charging modes, when a user goes out and the like, charging of the glucose biosensor can be achieved through the solar charging function or the reverse charging function of equipment such as a mobile phone, and therefore the endurance of the glucose biosensor is guaranteed.

The invention discloses biomass-based water-solid plastic as well as a preparation method, a water-solid forming method and application thereof, and belongs to the field of plastics, the water-solid plastic is plastic which can be subjected to self-deformation forming only by using water without using a mold, and the obtained shape can be kept stable and is not influenced by water environment and humidity change. The water-solid forming method mainly comprises the following steps: pre-designing the shape of the biomass-based water-solid plastic, performing water treatment, and performing drying treatment after deformation. The water-curable plastic can be automatically deformed into various one-dimensional, two-dimensional or three-dimensional shapes, no mold is needed, expensive and complex instruments and equipment are not needed, and the method is a plastic forming processing method which is simple to operate, low in energy consumption, low in cost, green, environment-friendly and carbon-reducing. The biomass-based water-solid plastic is prepared from biomass which is rich in reserves, low in cost, sustainable to regenerate, biodegradable and good in biocompatibility, has good mechanical properties and can be widely applied to various fields.

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.

The invention belongs to the technical field of plastic packaging bag preparation, and particularly relates to a degradable high-toughness e-commerce plastic packaging bag material and a preparation method thereof.The degradable high-toughness e-commerce plastic packaging bag material is prepared from, by mass, 55-68% of polylactic acid-polyhydroxybutyrate copolymer (PLA-PHB) and 10-15% of linear low density polyethylene (LLDPE) through a melt blending-twin-screw extrusion technology. A reinforcement phase: 25-30% of corn straw fiber (modified by a silane coupling agent KH-550), 5-8% of kudzu stem and leaf fiber, and 3-5% of cotton and linen fiber; through synergistic enhancement of the PLA-PHB copolymer (60%) and the modified corn straw fiber (28%), the tensile strength of the material reaches 42 MPa (60% higher than that of pure PLA), the elongation at break breaks through 520% (generally, the natural composting degradation rate in 90 days reaches 35%, the balance of'high strength and high toughness' and'rapid degradation 'is achieved for the first time, and the application prospect is broad. And the composite requirements of e-commerce packaging for impact resistance, tear resistance and end processing efficiency are met.

Conversion of the polyvalent polymers to their derivatives by reaction with divinyl sulfone provides vinyl sulfone-substituted polymers, which may additionally be further derivatized, including cross-linked, and these cross-linked and non-cross-linked derivatives can be used in biomedical and other applications.

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.

The application provides a variable-pitch microstructure photothermal wet flexible driver and a preparation method thereof, wherein the variable-pitch microstructure photothermal wet flexible driver comprises an active layer and a passive layer, the active layer is a PDMS / CNTs composite film, the passive layer is a chitosan film, the passive layer is arranged on the upper surface of the active layer, and the lower surface of the active layer is provided with a groove structure. The groove structure is engraved on the active layer, and the deformation capacity of the actuator can be enhanced by constructing the groove structure. The structure design makes the deformation more concentrated, and thus the working efficiency and response speed of the driver are improved.

The invention belongs to the technical field of coatings, and particularly relates to a fireproof coating material for a color-coated aluminum plate strip and a preparation method thereof, the fireproof coating material comprises the following raw materials by weight: 35-40 parts of an epoxy resin base material, 25-30 parts of a composite modified flame retardant, 5-10 parts of a modified reinforcing filler, 3-6 parts of a char forming accelerator, 1-2 parts of a dispersant, 0.5-1 part of an antifoaming agent, 15-20 parts of a solvent, and 2-4 parts of a wear-resistant auxiliary agent; wherein the composite modified flame retardant is prepared by firstly modifying melamine cyanurate, then reacting with a prepolymer synthesized by diethanol amine and adipic acid, and adding ammonium polyphosphate and expandable graphite; the modified reinforcing filler is prepared by treating silicon dioxide with a silane coupling agent and then reacting with chitosan and zinc nitrate. The coating material has excellent fire resistance, adhesive force, corrosion resistance and bending resistance through the synergistic effect of all the components, is suitable for surface protection of the color-coated aluminum plate strip, and can effectively improve the fire resistance rating and prolong the service life of the aluminum plate strip.

According to the PBAT or / and PLA dispersion and the preparation method thereof, the preparation method of the barrier coating liquid, the prepared coating liquid and the application of the barrier coating liquid, the PBAT or / and PLA dispersion provided by the invention is relatively safe in preparation process and application due to the fact that the used dispersing agent is only composed of ethanol, propylene glycol, glycerol and 1, 3-butanediol and does not need other auxiliaries; the prepared barrier coating liquid is used for preparing a coating, is water-based bio-based and degradable, and has waterproof and oil-proof characteristics. The problems that the waterproof performance cannot be achieved or can be achieved only after being complex and solvents are unhealthy in the prior art are solved.

The invention belongs to the technical field of polymer protective materials. The invention provides a pair of self-repairing antibacterial allergy-free butyronitrile gloves, the base material of which is prepared from the following components in parts by weight: 100 parts of nitrile rubber, 3 to 5 parts of dynamic cross-linking agent, 4 to 6 parts of lysozyme-chitosan composite microspheres, 12 to 15 parts of plasticizer, 1.0 to 1.2 parts of vulcanizing agent, 0.8 to 1.0 part of accelerant, 1.0 to 1.2 parts of stabilizer and 200 to 220 parts of deionized water, the dynamic cross-linking agent is dithiodipropionic acid; 0.5-1.0 part of hyaluronic acid moisturizing coating is coated on the inner surface of the base material. Aiming at the technical defects that the existing butyronitrile gloves are easy to damage, an antibacterial agent is easy to lose and the sensitization is high, a disulfide bond dynamic cross-linked network is constructed in a nitrile rubber matrix, a lysozyme-chitosan composite microballoon enzyme catalytic antibacterial system is introduced, and a phytosterol plasticizer and a hyaluronic acid inner coating are matched, so that the anti-allergenicity butyronitrile gloves are prepared. The coordination of triple functions of self-repairing, long-acting antibacterial and low sensitization is realized.

The invention discloses a battery diaphragm and a lithium ion battery, the battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises a binder, nano ceramic, an additive and a functional auxiliary agent, the binder is a polyvinylidene fluoride-hexafluoropropylene copolymer, the additive is hydroxyapatite, the functional auxiliary agent is chitosan, and the nano ceramic is nano ceramic. The nano ceramic is at least one of nano silicon dioxide, nano aluminum oxide and nano silicon carbide. The ratio of the binding agent to the nano ceramic to the additive to the functional auxiliary agent in parts by mass is (6-10): (5-10): (0.5-2): (0.05-0.3). The additive and the functional additive are introduced to prepare the slurry, and the slurry is coated on the base membrane by adopting a matrix type point coating mode, so that the bonding force of the diaphragm and an electrode is improved, and the interface stability is guaranteed.

The application discloses a water-soluble iridium complex and a phosphorescent film prepared from the same and application, relates to the technical field of functional materials, and the structural formula of the iridium complex is as follows: wherein n is an integer of 4-7. By introducing specific alkoxy with hydrogen bonding ability, the water-solubility of the iridium complex and the uniform dispersibility of the iridium complex in water are remarkably improved, and the compatibility of the iridium complex with CMC, SA, CS and other natural polymer materials is ensured. Meanwhile, the biodegradable natural polymer material is selected as a matrix, and the composite material system is endowed with good biocompatibility and environmental sustainability.

The invention discloses a self-repairing AR anti-reflection film for a folding screen and a preparation process of the self-repairing AR anti-reflection film, and relates to the technical field of display device film materials. An efficient viscosity reducer comprises the following components: a base film layer, a self-repairing layer and an AR micro-nano structure layer; the modified chitin is used in the base film layer, and the laccase-loaded mesoporous silica microspheres and the lignin-based repairing agent are introduced into the self-repairing layer, so that the film layer still has no cracks after being bent for 300,000 times at the curvature of 3mm, the repairing efficiency reaches or exceeds 90%, the service life of the folding screen is remarkably prolonged, the stability of the folding screen is remarkably improved, and the service life of the folding screen is prolonged. The damage risk caused by frequent bending is reduced, meanwhile, the self-repairing function can be automatically recovered when slight damage occurs, and the service life of the product is further prolonged.

A cellulosic particle contains: cellulose as its base constituent; and at least one selected from the group consisting of a hydrocarbon ester and a ketone, and the amount of the hydrocarbon ester or ketone in the cellulosic particle is 3 ppm or more and 1000 ppm or less.

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 present invention relates to biodegradable cross-linked alkyl polysaccharide dispersion materials for coating on lignocellulose sheets as a promising alternative to traditional plastic mulch in sustainable agricultural practices and process for preparation thereof. More particularly, the present invention relates to biodegradable cross-linked alkyl polysaccharide dispersion coating material coated on lignocellulose sheets having tensile strength 15‒20 MPa, tensile index of 25‒30 N.m / g wherein the coating dispersion material is obtained from the Michael addition reaction of polysaccharide (chitosan), acrylic crosslinker and further alkylation in presence of alkylamine in 93%‒95%yield. The aim of the invention is to mitigate environmental pollution and reduce dependence on non-renewable resources. The present invention provides a method of coating to prepare water repellent lignocellulose sheet / paper with a stability of 50‒70 days in outdoor environmental conditions and biodegradation in soil within 30‒45 days.