259results about "Chitin adhesives" patented technology

The present invention relates to processes utilizing ionic liquids for the dissolution of various polymers and / or copolymers, the formation of resins and blends, and the reconstitution of polymer and / or copolymer solutions, and the dissolution and blending of “functional additives” and / or various polymers and / or copolymers to form advanced composite materials.

A solid surface material with an antimicrobial agent in a thermoset and / or thermoplastic resin matrix where the antimicrobial agent comprises a chitosan-metal complex.

The present invention provides methods of preventing the flow of water or gas or both through a subterranean zone having a high temperature and a depth such that a long pumping time is required to place a sealing composition therein. The methods basically comprise the steps of preparing a polymeric sealing composition comprised of water, a cross-linking agent and a selected water-soluble polymer which reacts with the cross-linking agent and forms a sealing gel which is stable for a desired period of time at the temperature of the zone and has a pumping time before gelation in the presence of the cross-linking agent whereby the composition can be pumped to the depth of the zone and placed therein. Thereafter, the sealing composition is pumped into the zone and allowed to form a sealing gel therein.

The present application discloses methods for repairing hyaline cartilage defects. The methods comprise a combination of introducing autologous bone mesenchymal stem cells to a joint, and applying to the joint a membrane comprising a polyester entangled with a polysaccharide. In some aspects, the bone mesenchymal stem cells are mesenchymal stem cells originating in bone underlying the joint. In these aspects, contact between the joint and the mesenchymal stem cells can be effected by introducing apertures through the bone using standard surgical techniques such as microfracture, abrasion, or drilling. Cartilage which forms in response to application of these methods is hyaline cartilage rather than fibrocartilage.

Water-based, substrate treatment compositions contain (A) at least one chitosan selected from chitosan and a chitosan derivative, and (B) a metal compound containing at least one metal selected from Ti, Zr, Hf, Mo, W, Se, Ce, Fe, Cu, Zn, V and trivalent Cr. In particular, the water-based, substrate treatment compositions can improve the interlayer adhesion between metal materials and resin coating layers such as films or coatings, and can also improve the corrosion resistance and solvent resistance of such metal materials.

The invention relates to a preparation method and application of an environment-friendly lithium ion battery, and in particular relates to a simulated mussel protein environment-friendly lithium ion battery adhesive. By simulating the molecular structure and action mechanism of mussel protein, histidine and dopamine are connected to polyacrylic acid, polymaleic acid, sodium alginate, sodium carboxymethylcellulose, carboxymethyl chitin, carboxymethyl chitosan, abietic acid and other natural or synthesized polymer to prepare a series of aqueous adhesives. The adhesive has a good adhering effect for various cathode materials such as carbon black, graphite and silicon. By adopting the adhesive provided by the invention, various properties of a lithium ion battery can be obviously improved, and especially cycle property of a silicon cathode material in a battery can be obviously improved.

A biocompatible polymeric composition for cross-linking in-situ in a wound is disclosed comprising 1) one or more polyanionic polymers such as alginates or hyaluronates, able to be cross-linked the surface of the wound and 2) one or more polycationic polymers such as chitosan or DEAE-Dextran, that assists in the solidification process as well as speeds up hemostasis without the need for applying pressure. The biocompatible polymeric composition may further comprise a cross-linking agent such as aqueous calcium chloride. The invention encompasses an initial polymeric composition, the solidified matrix cross-linked and integrated at the wound site, including the methods of using, applying, and cross-linking the composition.

An electrode sensor kit for establishing electrical contact with skin comprises at least one contact element and a preparation comprising a mixture of water and at least one lipid for enhancing electrical contact properties between said contact element and the skin, wherein said mixture forms an emulsion, in particular a water-in-oil or an oil-in-water emulsion, having a conductivity of less than 3 mS / cm. An electrode assembly for electrical impedance tomography which comprises said kit is characterized in that (a) said at least one contact element forms an electrode or sensor plate, and (b) said at least one contact element comprises a layer of said preparation.

The invention discloses an enhanced-type composite adhesive of a lithium ion battery, a preparation method and an application thereof and belongs to the technical field of lithium ion battery adhesives. In the enhanced-type composite adhesive, a carboxyl group on a carboxyl-functionalized carbon nanotube can be condensed with groups, such as a hydroxyl group and the like, in a water-soluble high-molecular compound to form a bond for forming the enhanced-type composite adhesive. The enhanced-type composite adhesive has following three advantages: (1) the enhanced-type composite adhesive is greatly enhanced in tensile strength; (2) by means of a three-dimensional electric-conductive network formed by the carbon nanotube, the enhanced-type composite adhesive is effectively improved in electric-conductivity; and (3) the enhanced-type composite adhesive contains a special functional group which can be bonded with an electrode active material and is beneficial to ion transmission and tight combination between the composite adhesive and the active material can be maintained even a large size change is generated in the active material, so that a powder-falling phenomenon caused by volume expansion during a charging and discharging process can be prevented and cycling stability of the electrode active material is improved.

A solid surface material with an antimicrobial agent in a thermoset and / or thermoplastic resin matrix where the antimicrobial agent comprises a chitosan-metal complex.

The invention discloses an adhesive glue specially used for wood plywood, which is mainly made of the following raw materials: mung bean starch, bisphenol A epoxy resin, modifier, urea, formaldehyde, melamine rubber powder, lignin, biological enzyme, Potassium hydrogen sulfate, polyglycidyl ether, chitosan, polyvinyl alcohol and sodium hexametaphosphate. The adhesive glue special for wood plywood of the present invention has the advantages of strong adhesion, good modeling and dispersibility, and reduces the consumption of formaldehyde, and the free formaldehyde emission of the synthesized adhesive glue product reaches the EO level standard (≤ 0.5mg / L), reducing the emission of formaldehyde, no harm to the human body, belongs to the green environmental protection adhesive. High bonding strength and strong water resistance. The method for preparing the adhesive is simple, does not require very high equipment, and reduces production costs.

Water-based, substrate treatment compositions contain (A) at least one chitosan selected from chitosan and a chitosan derivative, and (B) a metal compound containing at least one metal selected from Ti, Zr, Hf, Mo, W, Se, Ce, Fe, Cu, Zn, V and trivalent Cr. In particular, the water-based, substrate treatment compositions can improve the interlayer adhesion between metal materials and resin coating layers such as films or coatings, and can also improve the corrosion resistance and solvent resistance of such metal materials.

Provided is an N-alkyl chitosan derivative having an ultraviolet ray-curable functional group represented by formula (I) given below: where l+m+n=1, 0<l<1, 0<m<0.5, 0<n<1 and R1 is represented by formula (II) given below: where R2 denotes a hydrogen atom or a methyl group.

The invention relates to an adhesive used for an artificial board and a preparation method thereof. The invention is characterized in that the artificial board consists of water, acid, chitosan, phenol and enzyme; the detail steps of the preparation technique are as follows: 70 to 100 portions of water, 0.01 to 6 portions of acid and 0.01 to 12 portions of flexible components are added into a stainless steel kettle; the temperature is between 10 and 80 DEG C; a stirring machine is started for uniformly mixing at a speed of 400r / min; 0.01 to 45 portions of phenol are added for stirring; the pH is adjusted to be 3 to 8; 1 to 10 portions of enzyme is added for continuously stirring; enzyme treatment time is between 0.1 minute and 48 hours; after the viscidity of the adhesive is 4 cups for 20 to 100 seconds, stirring is stopped; and then an opening is sealed for storage. The adhesive used for the artificial board does not contain formaldehyde, has no poison and smells during the production and use processes, does not release harmless gases, is safe and environmental friendly; the used chitosan is natural product which can be decomposed and recycled; in the invention, biocatalysis and biological transformation technologies are applied to wood industry; and bio-enzyme catalytic polymerization is adopted for preparing the adhesive and can be carried out under normal temperature and pressure.

A colored particle (e.g., a spherical particle) comprising an organic solid component (e.g., a polymer component) and a coloring agent (e.g., an oil-soluble dye, and an organic or inorganic pigment) is produced by eluting a water-soluble auxiliary component comprising at least an oligosaccharide from a composition having a disperse system, in which a particulate dispersed phase comprising the organic solid component and the coloring agent is dispersed in a matrix comprising the auxiliary component. The weight ratio of the polymer component relative to the auxiliary component may be about 55 / 45 to 1 / 99. The proportion of the coloring agent may be about 0.001 to 100 parts by weight relative to 100 parts by weight of the organic solid component. Such a process ensures conveniently and industrially advantageous production of a colored particle (e.g., a colored polymer particle) corresponding to the dispersed phase independently of affinity between the dispersed phase and the matrix.

The invention relates to a polymer composition comprising a biologically degradable polymer and a material from sea plants and / or shells of sea animals or at least two components selected from the group consisting of saccharides and the derivatives thereof, proteins, amino acids, vitamins and metal ions. The invention additionally relates to a molded article comprising said polymer composition. Said molded article may be used packaging material or fibrous material, in the form of fibrous material as mixing component for the production of yarns, and in the form of fibrous material for the production of nonwoven fabrics or woven fabrics.

The invention provides a preparation method for a wood adhesive with starch as a raw material, which belongs to the technical field of binders. The wood adhesive is prepared from the following raw materials expressed in weight parts: 20 to 30 parts of plant starch, 5 to 10 parts of alum, 4 to 7 parts of magnesium oxide, 2 to 8 parts of polyvinyl alcohol, 2 to 3 parts of phenol, 2 to 3 parts of sodium hydroxide, 1 part of methylolacrylamide, 2 to 4 parts of kaolin, 2 to 4 parts of bentonite, 4 to 8 parts of chitosan, 2 to 4 parts of glycerin, 1 part of disodium ethylene diamine tetraacetate, 2 parts of agar, 3 to 6 parts of cellulose and 30 to 50 parts of water. The wood adhesive provided by the invention has the following technical effects: raw materials used in the invention are nontoxic and harmless and no organic solvent is added, so the wood adhesive accords with requirements on furniture quality by the masses. According to the invention, starch is used as a main raw material, wood with high strength and a strong bonding force can be prepared, and novel application of transgenic crops is provided.

The present application discloses methods for repairing hyaline cartilage defects. The methods comprise a combination of introducing autologous bone mesenchymal stem cells to a joint, and applying to the joint a membrane comprising a polyester entangled with a polysaccharide. In some aspects, the bone mesenchymal stem cells are mesenchymal stem cells originating in bone underlying the joint. In these aspects, contact between the joint and the mesenchymal stem cells can be effected by introducing apertures through the bone using standard surgical techniques such as microfracture, abrasion, or drilling. Cartilage which forms in response to application of these methods is hyaline cartilage rather than fibrocartilage.

Disclosed is a foaming material composite including a water-soluble polysaccharide having ester linkage or amide linkage, a foaming agent, and a plasticizing agent.

A polymer blend is prepared by dissolving chitosan and a second polymer in an acidic aqueous solution to form an aqueous polymer blend, dehydrating said aqueous polymer blend, and recovering said polymer blend. The second polymer may be selected from the group consisting of polyether glycols including polyethylene glycols; cellulose esters including cellulose acetate; poloxamers; polysaccharides including dextran and guar; polyvinylpyrrolidones; polyvinyl alcohols; and mixtures or copolymers thereof. These polymer blends swell in an acidic environment and deswell in a more neutral or basic environment. This technology is valuable for the dispensing of biologically active material or drugs into a surrounding environment, especially the environment as is found in the gastrointestinal tract. Since the various polymer blends of the present invention are not covalently or ionically crosslinked, but are physically combined, each polymer in the physical blend maintains its original chemical structure, and therefore, is safe for oral administration.

The invention provides a preparation method of a highly stable hydrophilic coating for the surface of a medical device. The method comprises (1) a step of polishing, washing and drying the surface ofa medical instrument substrate; (2) a step of preparing an adhesive layer, namely a step of dissolving a compound containing a catechol component and a polyamino compound into a Tris-HCl buffer solution having a concentration of 0.05M and pH of 8.5 in a mass ratio of 1-2:1, and preparing the adhesive layer on the substrate; (3) a step of hydrophilic coating preparation, namely a step of dissolvinga zwitterionic polymer containing a dopamine group component into a Tris-HCl buffer solution having a concentration of 0.05M and pH of 8.5, and preparing a hydrophilic coating on the substrate. The method is simple to operate, mild in conditions and universal. The prepared hydrophilic coating has super hydrophilicity, good biocompatibility, anticoagulant properties, and high stability, and has good application prospect in the field of medical devices.

The invention discloses a preparation method of a konjak powder-chitosan-PVA mixed binder and relates to the technical field of binder preparation. The preparation method comprises 1, preparing a PVA solution with a mass fraction of 10%, 2, carrying out blending polymerization on konjak powder and chitosan in the solution, and 3, adding the PVA solution and a cross-linking agent chloropropylene oxide solution into the blended polymer and carrying out stirring at a temperature of 60-70 DEG C for 1.5-2h to obtain the mixed binder. The konjak powder-chitosan-PVA mixed binder has the advantages of high bonding strength, good water resistance and good stability, can be widely used in the fields of timber assembling and wood-based plate processing and can also be used in the field of water resistance and packaging.

Biomimetic adhesive compositions can be used in various aspects of subterranean treatment operations. Methods for treating a subterranean formation can comprise: providing an adhesive composition that comprises a first polymer comprising a plurality of monomers that comprise a phenolic moiety, a biopolymer that is crosslinkable with the first polymer, a crosslinking agent, and an oxidizing agent; introducing the adhesive composition into a subterranean formation; and forming a coacervate-bound surface in the subterranean formation by crosslinking the first polymer.

An aqueous adhesive composition and a process for preparing such compositions are disclosed. The composition comprises macromolecular complex comprising (A) a first component comprising (i) a framework element and (ii) a polyphenol, and (B) second component comprising a polypeptide, oligopeptide, amino acid, or polyamine. The framework element comprises (a) a polypeptide, oligopeptide, amino acid, or polyamine, (b) a polysaccharide, oligosaccharide, or monosaccharide, or a saccharide conjugate, or (c) a lignin, a lignan or a lignin conjugate. The polyphenol comprises a tannin, a tannic acid, a flavonoid, or a poly-resorcinol. An adhesive precursor composition comprising the first component is also disclosed.

The invention provides a rubber adhesive, which comprises the following components: natural rubber, styrene butadiene rubber, polyisobutylene rubber, chlorosulfonated polyethylene, lignin, kieselguhr, pineneresin, tert-butyl phenolic resin, promoter M, zinc oxide, stearic acid, anti-aging agent 4010, anti-aging agent DNP, anti-aging agent MB, methylbenzene and chitin, and has the characteristics of aging resistance, high-pressure resistance and high-temperature resistance.

Disclosed is a cellulose ester film which is suppressed in volatilization of components during film formation, while having high surface flatness, high durability after saponification and good adhesion to a polarizer. Also disclosed is a method for producing such a cellulose ester film by melt forming. Further disclosed are a polarizing plate having high light resistance and high durability, and a liquid crystal display having high image quality. Specifically disclosed is a cellulose ester film characterized by containing a cellulose ester, a compound represented by the general formula (1) below, and a compound represented by the general formula (2) below.

The invention provides compositions and methods for in situ repair of compromised polymeric membranes. The invention is useful for repairing compromised polymeric membranes without requiring the knowledge of damage location or the disassembly of a system. The invention relates to preferential blocking of damaged sites using agglomerates and subsequent cross-linking to form sturdy plugs.