98results about "Chitin adhesives" patented technology

The invention provides a bio-based adhesive and a preparation method thereof. Inspired by a spider thread structure, biomass adhesive interface enhancement based on a tannic acid adhesion group is combined with construction of a differential phase separation structure by biomass-induced polylipoic acid depolymerization, and a brand new strategy of adhesion-cohesion synergistic enhancement of the adhesive strength of the adhesive is realized. According to the invention, tannic acid and carboxymethyl chitosan are introduced into a lipoic acid-based adhesive, so that the purpose of synergistically enhancing the bonding performance of the adhesive through adhesion-cohesion is achieved, and the defects of weak cohesion, low bonding strength, poor water resistance, poor moisture resistance and the like of the conventional biomass adhesive are overcome. Benefited from a new strategy of adhesion-cohesion synergistic enhancement, the biomass adhesive has good adhesive strength in various environments and materials. In addition, the biomass adhesive also has the characteristics of biological safety, antibacterial and mildew-proof properties and recoverability, so that the product has wider application and potential compared with the previous product, and has a good application prospect.

The invention belongs to the technical field of adhesives, and particularly relates to a preparation method of a polysaccharide-based reversible bonding adhesive for constructing a dynamic covalent bond network. The preparation method comprises the following steps: by taking lipoic acid and sodium alginate as reactants and ferric chloride as a cross-linking agent, carrying out cross-linking reaction under a stirring condition to obtain a lipoic acid adhesive, namely the polysaccharide-based reversible bonding adhesive. According to the invention, renewable biomass resources such as sodium alginate, hyaluronic acid, chitosan and the like are used as main raw materials, so that the adhesive is expected to replace a traditional synthetic adhesive depending on a petroleum base, accords with a sustainable development strategy, contributes to reducing consumption of fossil resources, avoids release of toxic substances such as formaldehyde and the like in the synthesis and use processes, and has a good application prospect. And the method is more environment-friendly. The bio-based polysaccharide raw material has good biocompatibility and degradability, and an ideal base material is provided for developing a green and safe biomedical adhesive.

The invention discloses a preparation method of an environment-friendly degradable single-sided perspective sticker, and belongs to the technical field of modified nano materials. The method comprises the following steps: (1) preparation of a multi-layer composite structure: mixing polylactic acid and poly (butylene succinate), adding nano-montmorillonite and a surface modifier, and carrying out melt blending to form a first-layer melt; stirring poly (butylene adipate-co-terephthalate) and fluorescent carbon nanodots to form a second layer of melt; the first layer, the pressure-sensitive adhesive layer and the second layer are co-extruded and compounded to form a film blank. And (2) construction of the nano-film: biaxially stretching the film blank, imprinting a micropore array, dipping in the silver nanoparticle suspension, and drying to obtain the nano-film. And (3) coating functionalization treatment: immersing into a fluorine-containing nano coating solution, and curing. And (4) post-treatment: carrying out secondary curing. The obtained single-sided perspective sticker is suitable for the fields of buildings, vehicle privacy films and the like, and solves the problems of serious pollution and slow degradation of a traditional sticker.

The invention discloses a protective adhesive film for sealing and testing a semiconductor and a preparation method of the protective adhesive film, and relates to the technical field of adhesives. The protective adhesive film is obtained by taking a modified acrylate monomer as a main body, taking a synthetic product of 2-hydroxypyridine and methacryloyl chloride as a modifier, taking trimethylolpropane triacrylate as a cross-linking agent and adding maleic anhydride modified modified chitosan and modified polyimide in a polymerization film forming process. The modified acrylate monomer is obtained by taking graphene oxide modified by vinyl trimethoxy silane and hollow glass beads modified by methacryloxy propyl trimethoxy silane as heat conducting fillers; the modified polyimide is obtained by adding a boron nitride nanosheet modified and acidified by amino acrylic acid as a heat-conducting reinforcing filler into a polyimide prepolymer and then carrying out imidization. The mechanical property, heat conduction efficiency and low-temperature brittleness of the protective adhesive film can be improved.

The invention belongs to the technical field of biomass materials and environment-friendly adhesives, and relates to a biomass adhesive, in particular to a preparation method of a biomass environment-friendly adhesive based on longan shells, which comprises the following steps: firstly, cleaning, drying, crushing and screening the longan shells for pretreatment, and then carrying out alkalization and acetylation chemical modification to obtain the biomass environment-friendly adhesive based on the longan shells. And finally, compounding with gelatinized starch, a chitosan acetic acid solution and citric acid, and adjusting the viscosity to obtain the adhesive. The waste longan shells are used as raw materials, agricultural waste recycling is achieved, the product is free of formaldehyde release and biodegradable, and the viscosity of the prepared adhesive is 1000-2000 mPa.s at the temperature of 25 DEG C and is measured through a rotary viscometer; the wood-wood bonding strength is larger than or equal to 2.5 MPa, the 24-hour water absorption rate is smaller than or equal to 25%, the problems that a traditional biomass adhesive is short in performance and low in cost, special equipment is not needed for preparation are solved, the adhesive is suitable for the industrial fields of artificial board manufacturing, furniture manufacturing and the like, and environment-friendly transformation of the adhesive industry is promoted.

The invention belongs to the technical field of preparation of molecular materials and adhesive tapes, and discloses a degradable mylar adhesive tape and a preparation method thereof, the degradable mylar adhesive tape comprises a degradable base material layer and a degradable adhesive layer; the degradable base material layer is prepared from the following raw materials in parts by mass: 25-35 parts of poly (butylene succinate) (PBS), 20-30 parts of polylactic acid (PLA), 10-15 parts of polycaprolactone (PCL), 8-12 parts of modified bamboo fiber powder, 3-5 parts of a compatibilizer and 0.5-1 part of an antioxidant; the degradable adhesive layer is prepared from the following raw materials in parts by mass: 40 to 50 parts of a modified starch-based adhesive, 15 to 25 parts of poly (butylene adipate-co-terephthalate) (PBAT), 10 to 15 parts of polyhydroxyalkanoate (PHA), 5 to 8 parts of sodium alginate-chitosan composite gel, 5 to 8 parts of an epoxypropane modifier, 1 to 2 parts of a cross-linking agent and 0.3 to 0.5 part of a de-foaming agent; by optimizing the raw material composition and the preparation process of the base material and the adhesive, the full-life-cycle degradability of the adhesive tape is realized, and meanwhile, excellent mechanical properties, insulativity and temperature resistance are ensured.

The invention relates to the technical field of adhesive preparation, in particular to an epoxy resin-based paper adhesive and a preparation method thereof, and the epoxy resin-based paper adhesive is prepared from the following raw materials in parts by weight: 40-55 parts of an epoxy resin matrix, 18-29 parts of a bio-based reinforcing system, 15-25 parts of a recovery adaptation system and 10-15 parts of a toughening system; the epoxy resin matrix is composed of bisphenol A epoxy resin and epoxidized soybean oil. According to the invention, bio-based modified epoxy resin and natural polymer partially replace petrochemical raw materials, carbon footprint is significantly reduced, the defect of insufficient water resistance of a biological material is made up through a nanocellulose composite enhancement technology, and a thermo-sensitive polyvinyl alcohol and initiator system is introduced, so that the binder can be rapidly stripped under mild conditions during recovery, and the recovery rate of the binder is increased. According to the scheme, high bonding strength is kept, meanwhile, comprehensive optimization of recoverability, environmental adaptability and cost effectiveness is achieved, and reliable technical support is provided for green upgrading of the corrugated paper industry.

The invention belongs to the technical field of natural adhesives, and discloses a natural adhesive with coconut pectin biomass as a raw material and a preparation method thereof.The preparation method comprises the steps that coconut shell fibers, coconut meat residues and other coconut fruit waste are utilized, and active polysaccharide and vegetable protein are obtained through an oxidized saline water extraction technology; the composite adhesive is formed by self-assembly crosslinking of the modified starch, the polyvinyl alcohol, the modified starch and the epoxidized glyceryl polyether. The adhesive is high in bonding strength, the initial strength of 80% or above can still be kept after the adhesive is soaked in water, the content of VOCs is lower than 10 g / L, and the environment-friendly requirement is met. The problem of environmental pollution of a traditional petroleum-based adhesive is solved, meanwhile, the technical defects that an existing bio-based adhesive is insufficient in strength and poor in water resistance are overcome, a green and environment-friendly adhesive substitute is provided for the wood industry, and the production cost is remarkably reduced.

The invention belongs to the technical field of adhesive materials, and particularly relates to a modified starch-based water-based adhesive as well as a preparation method and application thereof. According to the adhesive, oxidized corn starch is taken as a base material, hydrophobic and weather-resistant modification is realized by introducing a fluorine-silicon-containing functional monomer, and hydroxypropyl quaternized chitosan is compounded to endow antibacterial property and a film-forming enhancement effect; a borax cross-linked polyol system is supplemented to improve the cohesive strength, and a plasticizer, a thickening agent and an emulsifier are matched to optimize the rheological property and wettability. The preparation process comprises the steps of starch gelatinization, fluorosilicone urea grafting, chitosan derivative compounding, auxiliary agent blending and the like, and the process is mild, environment-friendly and non-toxic. The obtained water-based adhesive has the characteristics of strong initial adhesion, good water resistance, moderate flexibility, excellent biocompatibility and the like, and is especially suitable for adhesion and manufacturing of ball products such as basketballs, footballs and the like.

The invention discloses a safe and easy-to-tear firework lead paper adhesive product and a preparation method thereof, and belongs to the technical field of paper adhesive product preparation. The safe and easy-to-tear firework lead paper adhesive product is composed of cotton paper, backing paper and modified hot melt adhesive coated on the surface of the cotton paper, and the modified hot melt adhesive is composed of 80-96 parts of composite resin, 15-24 parts of curing agent, 4-9 parts of plasticizer, 10-15 parts of filler, 30-50 parts of solvent, 2-6 parts of hydrophobic modifier and 1-6 parts of assistant. The product prepared by the method has excellent bonding performance, safety performance and hydrophobic performance.

The present application provides a kind of ship hull barnacle protection net.The support layer of the protection net is nanofiber membrane with micron pit array formed by laser etching, the inside is attached to the adhesive made of modified dopamine-acrylate copolymer, nano-silica, calcium alginate microspheres, chitosan, chitin nanofiber, lanolin and antioxidant, and the outside is compounded with stainless steel wire mesh.The present application realizes long-term inhibition of barnacles through the physical barrier of the hydrophobic support layer and the synergistic effect of the antifouling components in the adhesive without adding toxic antifouling agents, and has the characteristics of firm bonding, excellent mechanical properties, environmental protection and non-toxicity, effectively solves the problems of poor antifouling effect, insufficient bonding reliability and poor environmental protection of existing protection materials, and is suitable for barnacle protection of underwater parts of ship hull.

The invention relates to the technical field of lithium batteries, in particular to a composite aqueous binder and application thereof to a lithium-rich manganese-based material. The preparation method of the composite aqueous binder comprises the following steps: S1-1, mixing and stirring a carboxymethyl chitosan solution and polyvinylidene fluoride to obtain a PC solution; s1-2, humic acid is added into the PC solution, deionized water is added for dilution until the solid content is 4-6 wt%, and the composite water-based binder is obtained. The composite aqueous binder and the lithium-rich manganese-based material are jointly used for preparing the positive electrode slurry. And the preparation of the positive electrode slurry comprises the following steps: S2-1, mixing and stirring the lithium-rich manganese-based material, the conductive agent and the composite aqueous binder, adding N-methyl pyrrolidone, and grinding to obtain the positive electrode slurry.

The present invention particularly relates to the field of adhesion of tobacco products. Disclosed are a water-based adhesive for cigarettes, and a preparation method therefor. By adding sodium fluorescein to the adhesive, the adhesive emits bright green fluorescence under ultraviolet light, and the quality detection during production process and anti-counterfeiting function are realized. In addition, sodium bicarbonate and citric acid react to generate carbon dioxide bubbles, thereby enhancing the visualization and controllability of the adhesion process. By means of the improvements, the present invention effectively solves the problems of difficult quality control and poor user experience in the prior art, improves the performance and the application effect of the adhesive, and satisfies the requirements of the modern tobacco industry for efficient, safe and multifunctional adhesives.

The disclosure relates to an adhesive kit comprising first and second emulsions configured to reversibly adhere to one another. The invention also provides methods of using said kit. The invention also provides aqueous emulsions comprising particles dispersed in an aqueous phase, the particles comprising a hydrophobic polymer and being positively or negatively charged.

The invention discloses a preparation method of a bio-based binder based on a lithium-sulfur battery in the technical field of lithium-sulfur batteries, which comprises the following steps: S1, selecting a natural polymer material as a matrix material, purifying the selected matrix material, and modifying according to actual requirements; s2, uniformly mixing the modified matrix material with a reinforcing component; s3, adding a cross-linking agent into the mixed system to carry out a cross-linking reaction; s4, water and a low-toxicity organic solvent are adopted as dispersion media, the mixed system is dispersed in a selected solvent, and uniform slurry is formed; and S5, coating the prepared binder slurry on an electrode current collector of a lithium-sulfur battery, and then carrying out drying treatment to obtain the bio-based binder. According to the invention, a natural high polymer material is adopted as a matrix, so that the dependence on petroleum-based raw materials is reduced, the environmental pollution in the production process is reduced, and the concepts of green chemistry and sustainable development are met.

The invention discloses a method for preparing a reinforced composite wood floor by adopting a low-formaldehyde adhesive. The method comprises the following steps: mixing urea-formaldehyde resin, lignin, chitosan and soybean protein isolate to prepare a bio-based multi-component composite adhesive; mixing the adhesive with wood fibers and bamboo fibers, and adding a microencapsulated phase change material to prepare a base material blank; carrying out sectional type hot press molding on the base material blank; coating the surface of the base material with a photocatalytic formaldehyde capturing primer; preparing a multifunctional wear-resistant layer containing self-repairing microcapsules, a super-hydrophobic nano material and a negative ion release material; and carrying out secondary hot-pressing compounding on the functional base material, the decorative paper and the wear-resistant layer. The reinforced composite wood floor prepared by the invention has multiple functions of low formaldehyde emission, good temperature regulation function, surface self-repairing, antifouling and self-cleaning, air purification and the like, and meets the requirements of healthy, comfortable and intelligent home environment.

The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a binder for a lithium battery. The preparation method specifically comprises the following steps: step 1, initiating polymerization of vinylidene fluoride, dioctyl sebacate and lauryl methacrylate to obtain modified polyvinylidene fluoride resin; 2, carboxymethyl chitosan is subjected to a reaction with diketoacrylamide and phthalic dihydrazide in sequence, and modified chitosan is obtained; and 3, mixing the modified polyvinylidene fluoride resin, the modified chitosan and polyvinyl alcohol, stirring and compounding to obtain the binder for the lithium battery. The binder for the lithium battery can form a plurality of hydrogen bond network structures with the surface of a negative electrode active material, so that the lithium battery has a firmer mechanical structure, and the lithium battery can bear the stress of internal volume expansion; in addition, the binding force between the negative electrode active material and the current collector can be greatly improved, the cycle performance of the battery is improved, the electrochemical performance and the safety performance of the lithium battery are ensured, and great practical application significance is achieved.

The invention provides a green environment-friendly adhesive as well as a preparation method and application thereof, the green environment-friendly adhesive is prepared from naturally existing macromolecular polymer salt and shows high adhesion strength on different matrixes, and the adhesion effect of the green environment-friendly adhesive is far better than that of reported adhesives based on protein and natural macromolecular materials; the bonding time of the adhesive is long, and after a three-year accelerated aging test is simulated, the bonding strength is slightly attenuated; the adhesive has high-temperature resistance and low-temperature resistance, the bonded material can tolerate the extreme temperature of-150 DEG C to 200 DEG C without stripping, and in the dry extreme environments such as the dry high-temperature desert environment and the dry low-temperature space environment, the adhesive can meet the bonding requirements of materials with rough surfaces; the SFA can be separated from the surface by using an environment-friendly nontoxic alkaline sodium carbonate or sodium bicarbonate solution without damaging the surface of the base material, so that the SFA adhesive can be applied to the bonding of precious materials of the base material, such as the special fields of cultural relic repair and the like; the interface bonded by the green environment-friendly adhesive can be repeatedly used after being soaked in water, and the interface separated after soaking can be re-bonded for at least 10 times after being shifted without reducing the bonding capacity; the raw materials of the natural biopolymer are sufficient and low in price, so that the SFA has higher economic value and large-scale application potential.

The invention discloses application of a rosin derivative, a rosin derivative modified chitosan adhesive as well as a preparation method and application of the rosin derivative modified chitosan adhesive, according to the application of the rosin derivative, the structure of the rosin derivative is shown in the specification, and the rosin derivative is used for modifying the chitosan adhesive. The rosin derivative modified chitosan adhesive is prepared from the following raw materials in percentage by mass: 8% of chitosan, 2-4% of rosin derivative, 1-2% of microcrystalline cellulose and the balance of deionized water. The problems that an existing chitosan adhesive is low in shear strength and poor in water resistance are effectively solved.

The present application relates to a kind of environment-friendly flame-retardant cold-pressing adhesive and its preparation method.The raw materials of the environment-friendly flame-retardant cold-pressing adhesive include 14-21 parts of modified hydrosol, 5-15 parts of magnesium sulfate, 25-35 parts of magnesium chloride, 95-105 parts of magnesium oxide and 0.001-0.01 parts of boric acid by weight.The modified hydrosol is prepared by oxidation crosslinking reaction of propylene hard monomer and hydrosol precursor in the presence of oxidant and crosslinking agent.The adhesive obtained by compounding modified hydrosol with magnesium oxychloride and magnesium oxysulfate inorganic glue has the advantages of high mechanical and bonding strength, good water resistance, and good flame-retardant effect.The modified hydrosol provided by the present application has crosslinking network and abundant hydroxyl and carboxylic acid groups, which gives the adhesive excellent permeability and bonding strength.Magnesium oxychloride inorganic glue enhances the mechanical strength of the adhesive, and magnesium oxysulfate inorganic glue enhances the water resistance of the adhesive.The present application also relates to a plywood containing the above-mentioned environment-friendly flame-retardant cold-pressing adhesive and its preparation method.

The application discloses a preparation method of an environment-friendly degradable single-side perspective sticker and belongs to the technical field of modified nanometer materials. The method comprises the following steps: (1) preparation of a multilayer composite structure: mixing polylactic acid and polybutylene succinate, adding nano-montmorillonite and a surface modifier to melt blend to form a first layer melt; stirring polybutylene adipate terephthalate and fluorescent carbon nanodots to form a second layer melt; and forming a film blank by co-extruding the first layer, a pressure-sensitive adhesive layer and the second layer; (2) construction of a nanometer film: biaxially stretching the film blank, pressing a micropore array, immersing in a silver nanoparticle suspension and drying to obtain a nanometer film; (3) functionalization treatment of a coating layer: immersing in a fluorine-containing nanometer coating solution and solidifying; and (4) post-treatment: secondary solidification. The obtained single-side perspective sticker is suitable for fields such as building and vehicle privacy films, and solves the problems of large pollution and slow degradation of traditional stickers.

The present invention relates to the manufacture of a photo-crosslinkable biodegradable tissue adhesive using a multinetwork-forming copolymer, and provides a hyaluronic acid copolymer compound having excellent elongation, mechanical properties, and tissue adhesion. The compound fundamentally does not undergo phase separation, and enables the manufacture of a tissue adhesive with desired adhesive characteristics and physical characteristics.

The invention discloses a nanometer chitin temperature-sensitive self-healing hydrogel adhesive based on triple dynamic hydrogen bonds and a preparation method and 3D printing application thereof, and relates to the technical field of functional polymer composites.The nanometer chitin temperature-sensitive self-healing hydrogel adhesive based on the triple dynamic hydrogen bonds comprises oxalic acid hydrolyzed chitin nanofibers with the diameter being 15-40 nm and the diameter being 10-20 nm; the length-diameter ratio is greater than 150, and the carboxyl content is 0.6-0.75 mmol / g; polyvinyl alcohol with a concentration of 10-60 wt%, an alcoholysis degree of 88-99% and a polymerization degree of 1700 + / -200; tannic acid with a concentration of 1-20 wt%; wherein the mass ratio of the oxalic acid hydrolyzed chitin nanofibers to the polyvinyl alcohol is 1: 10, and the TA accounts for 5-20wt% of the total mass of the hydrogel. According to the work, nano chitin hydrolyzed by oxalic acid, tannic acid and PVA are mainly used as main media, and the OTP adhesive which has certain cohesive strength, is good in adhesion, can be self-healed, can be injected and has temperature sensitivity is formed through strong hydrogen bond interaction. The preparation method of the adhesive is simple and efficient, and efficient and controllable 3D printing can be achieved through the good auxiliary wound healing performance of the adhesive.

The invention relates to the technical field of solid-state batteries, in particular to a chitin derivative binder and application thereof in an all-solid-state battery. The structural formula of the chitin derivative binder is shown in the specification, in the formula, R is independently selected from any one or more of H, X-C = O-, alkyl,-CH2CH (OH) CH3, Y-NH-C = O-,-CH3 (CH2) and-CH3COONa, and X and Y are alkyl; n is an integer not less than 10. The chitin derivative binder is synthesized for the first time and is applied to composite solid electrolyte film formation, and the composite electrolyte prepared from the chitin derivative has high flexibility and ionic conductivity, is suitable for various electrode materials and an existing lamination process, and has a rapid industrialization prospect.

The invention discloses a production process of a degradable antibacterial BOPP adhesive tape for food packaging, and relates to the field of packaging materials and adhesive tapes. According to the method, a blend of polylactic acid and a poly (butylene adipate-co-butylene terephthalate) copolymer is used as a base material, and through melt mixing, extrusion calendering, two-way stretching, surface treatment and coating of an adhesive layer containing a pressure-sensitive adhesive and an addition antibacterial agent, the polylactic acid / poly (butylene adipate-co-butylene terephthalate) composite film with packaging strength and processing adaptability and good packaging performance is prepared. And the adhesive tape also has biodegradability and an antibacterial function. The obtained adhesive tape is suitable for food packaging, box sealing and packaging and can be degraded under the composting condition after being used, and meanwhile, the antibacterial layer of the adhesive tape has a remarkable inhibiting effect on common food-borne microorganisms.

The application discloses a preparation method of a silicon-based negative electrode binder, which comprises the following steps: adding chitosan into a sodium hydroxide isopropanol solution, stirring at room temperature, then adding 3-(2,2,3,3-tetrafluoropropoxy)-1,2-propylene oxide, stirring and reacting under temperature rising, dropping into an ice water bath after cooling to precipitate, washing the precipitate with ethanol, drying to obtain modified chitosan, dispersing the modified chitosan into DMF, then adding propyl triethoxysilane isocyanate and dibutyl tin dilaurate, stirring and reacting, precipitating the product in an ice water bath, filtering, washing with diethyl ether and drying to obtain an intermediate, and adding an additive to the intermediate after free proton hydrogen treatment to obtain the silicon-based negative electrode binder; the application further discloses a battery negative electrode slurry; the binder prepared by the method has high peeling strength, can effectively buffer the volume change of the silicon-based negative electrode in the process of lithium extraction and embedding, thereby effectively ensuring the integrity of the electrode structure and improving the cycle performance of the silicon-based negative electrode.

The present disclosure provides for a photocrosslinkable tissue bonding composition comprising: a poly(ethylene glycol) functionalized with at least one photocrosslinkable group, a hydroxy-modified chitosan, and a photochemically active dye. Further provided herein is a photocrosslinked tissue bonding composition comprising: a photochemically active dye and a functionalized poly(ethylene glycol). Also disclosed is a kit for treating a wound, comprising a poly(ethylene glycol) functionalized with at least one photocrosslinkable group, a hydroxy-modified chitosan, a photochemically active dye, and an applicator. Further provided is a method for producing a photocrosslinkable tissue bonding composition and a method for treating a wound.

The invention discloses a hydrogel adhesive composition for plant grafting and a grafting method and application of the hydrogel adhesive composition, and belongs to the technical field of agricultural materials and gardening assistants.The hydrogel adhesive composition comprises hydrogel precursors and a cross-linking agent, the hydrogel precursors are sodium alginate (SA) and chitosan (CS), the cross-linking agent is a salt solution containing divalent cations, and the hydrogel precursors are sodium alginate (SA) and chitosan (CS). The sodium alginate, the chitosan and the cross-linking agent are subjected to a cross-linking reaction, the generated hydrogel generates dynamic and self-adaptive clamping force through dehydration shrinkage, and the static pressure of the hydrogel is superior to that of a traditional mechanical clamp.