55 results about "Cellulose formation" patented technology

The invention belongs to the field of material science and particularly relates to a graphene oxide/cellulose compound material as well as a preparation method and application of the material. The compound material is prepared by mixing graphene oxide suspension and alkaline solution of cellulose, and forming a compound structure of the graphene oxide and the cellulose under the action of mechanical stirring, shearing, ultrasonic or the like. In the preparation method, raw materials are cheap and easy to obtain, a water system is simple and free of pollution, equipment is simple and low in cost, and the industrial preparation is easy to realize; and the prepared compound material has the properties of fiber and the graphene oxide and is widely applied.

The present invention concerns a method of preparing a film of nanofibrillated cellulose (NFC) on at least one surface of a support material, wherein the film is applied and spread directly onto a surface of the plastic support material in the form of a suspension of nanofibrillated cellulose, whereby the nanofibrillated cellulose forms a film. Further, the invention concerns a structure containing or consisting of a film of nanofibrillated cellulose prepared using said method.

The invention discloses a preparation method of an antibacterial hydrogel. The preparation method comprises the following steps: step 1, oxidizing active hydroxyl in hemicellulose into an aldehyde group by using an oxidant to obtain dialdehyde hemicellulose; step 2, enabling an excessive dialdehyde hemicellulose solution to react with a chitosan solution, and forming a mixture of the hydrogel and remained dialdehyde hemicellulose; and step 3, soaking the mixture into a solution containing silver ions to ensure that silver particles are adsorbed on the surface of a hydrogel network structure, thus preparing the antibacterial hydrogel. By adopting the method disclosed by the invention, hemicellulose is modified by using the oxidant and is provided with a functional group, so that hemicellulose is beneficial for performing a Schiff base reaction with an amino group in chitosan. The preparation method of the antibacterial hydrogel is low in reaction temperature condition and low in energy consumption, and is easy to put into industrial production. In addition, the silver particles adsorbed by the prepared antibacterial hydrogel reach nano-level and have excellent antibacterial effects.

The invention discloses a preparation method of nanocellulose and polymer composite aerogel. The preparation comprises the steps that a Pickerin emulsion containing a polymer in an oil phase of which the nanocellulose is stable is subjected to gelation firstly, freeze drying is conducted, and the nanocellulose and polymer composite aerogel which is high in porosity and low in density is obtained. The preparation method is suitable for nanocellulose which is extracted and prepared from various raw materials and has different morphology and various water insoluble polymers, and large-scale popularization is easy to achieve. For most composite aerogel materials formed by water-soluble polymers and cellulose at present, composite aerogel materials formed by the water insoluble polymers and cellulose are obtained. Meanwhile, reagents used in the preparation method are common reagents, the price is low, the preparation process is simple, convenient and rapid, and the obtained nanocellulose and polymer composite aerogel has the advantages of being high in porosity, low in density and low in heat conductivity coefficient, having water absorption oil absorption performance and the like.

The invention relates to the technical field of flexible sensor materials, particularly to an anti-freezing self-repairing conductive hydrogel and a preparation method thereof, and a flexible sensor. According to the preparation method, a conductive nanofiller/nanocellulose/polyacrylamide hydrogel is soaked in a composite modifier aqueous solution containing an anti-freezing agent and a metal salt, wherein the metal salt cooperates with the anti-freezing agent component to replace water molecules in a hydrogel network system, so that the freezing point of water in a composite hydrogel network structure is reduced, and the freezing resistance is improved; metal cations and cellulose in the composite hydrogel form reversible ionic bonds, the cellulose and polyacrylamide form reversible hydrogen-bond interaction, and the prepared hydrogel is endowed with excellent self-repairing performance through a formed multiple reversible network; and the metal salt cooperates with the conductive nano-filler to endow the prepared hydrogel with excellent conductivity, sensitive sensing performance and mechanical flexibility meeting the requirements of corresponding application scenarios.

A capsule with good disintegration properties that can quickly display its content's efficacy as well as a method for preparing the same are provided. More specifically, provided is a capsule comprising a shell comprising low-substituted cellulose ether. Also, provided is a method for preparing a hard capsule comprising the low-substituted cellulose ether comprising a step of covering a pin for forming the hard capsule with the low-substituted cellulose ether by immersing the pin in an alkaline solution of the low-substituted cellulose ether; a step of forming the low-substituted cellulose on a surface of the pin into a gel by further immersing the covered pin in an aqueous acid solution; a step of washing by immersing the pin whose surface has been covered with the gel in water; and a step of drying.

The invention discloses a method for preparing a battery membrane with the excellent ion conductivity. The method of the invention comprises the following steps: cellulose with the degree of polymerization of 500 to 1600 is dissolved in a solvent to form a solution; alkyl cellulose is dissolved in the solvent to form a solution; the two solution are mixed into a solution which has the polymer with the weight concentration of 25 to 50 percent, then polyethylene glycol and zinc chloride solutions are added; a gel membrane containing the alkyl cellulose which is dispersed in the regenerated cellulose continuous phase is formed; and the gel membrane is dried to prepare the battery membrane. The battery membrane which is prepared by the invention can be resistant to the alkaline electrolyte and not be penetrated by zinc ions; furthermore, the battery membrane contains the polymer region with the hydrogen penetration rate.

The invention discloses a processing technology of a crease-resistant fabric for western-style clothes. The technology concretely comprises the following steps: weaving cotton/wool blended yarns usedas warp yarns and cotton/XLA fiber core-spun yarns as weft yarns; treating a base cloth in a treatment bath containing sodium pyrophosphate and hydrogen peroxide; polymerizing maleic acid and an acrylic emulsion to obtain a finishing agent; mixing the crease-resistant finishing agent, disodium hydrogen phosphate, sodium borofluoride, an osmotic agent and active polypeptides to prepare a finishingsolution; and treating the hydrogen peroxide treated base cloth in the finishing solution, and pre-drying and drying the treated base cloth to obtain the crease-resistant fabric for western-style clothes. The crease-resistant finishing agent is harmless to human bodies and the environment, and the crease-resistant finishing agent and cellulose can form a macromolecular network structure compound to make the cellulose have a large relative slip space when meeting outside force in order to improve the crease-resistant finishing effect; and the fabric has the advantages of good drapability, goodcrease resistance, good breathability and excellent washing resistance.

Composite body comprises nanofibrillar cellulose (NFC) together with abrasive particles (AP). The nanofibrillar cellulose forms a 3-dimensional connecting network for the abrasive particles (AP). The abrasive particles have a hardness above 7 on Mohs scale. The composite body is used for grinding, polishing or cutting.

The invention discloses a double-metal material supported phosphotungstic acid (PTA) catalyst as well as a preparation method and application thereof to cellulose hydrolysis. The method comprises thefollowing steps: introducing transition metal ions Ni<2+> when an organic ligand is coordinated with metal to form competition coordination with central metal ions Cr<3+>; adding organic acid to accelerate the coordination of composite double-metal MOFs (Metal Organic Frameworks) and realize the effect of a mineralizing agent; introducing -NH2 and phosphotungstic acid to realize chemical supporting of PTA through electrostatic interactions, so as to synthesize the catalyst. According to the catalyst disclosed by the invention, a hydrogen bond is formed through a heavy-current negative group and cellulose to adsorb the cellulose, so that directed transformation from the cellulose to glucose is realized. Meanwhile, an inner hydrogen bond effect of the cellulose also can be weakened through the hydrogen bond effect and the crystallization degree is reduced so that the catalyst is easier to hydrolyze and the hydrolysis efficiency is improved. In a catalyst synthesis process, solutions of HF (Hydrofluoric Acid) acid, sodium hydroxide and the like are not added, so that the catalyst is green and environmentally friendly.

The invention discloses a cellulose-heteropoly acid proton exchange membrane for an electrochemical sensor and a preparation method therefor. Heteropoly acid is loaded on functional groups of cellulose derivatives through an ion self assembly technology, then acid processing is carried out, the cellulose derivatives is regenerated into cellulose and the cellulose-heteropoly acid proton exchange membrane is formed. The preparation method comprises the following steps: cellulose, sodium hydroxide and urea are dissolved in water in proportions and cellulose carbamate is formed; then heteropoly acid is added and self assembly of the heteropoly acid and cellulose carbamate is carried out, a liquid membrance is formed through tape casting or blade coating, after drying is carried out, cellulose regeneration in sulfuric acid is carried out, washing is carried out, drying is carried out again and the proton exchange membrane is obtained. The prepared cellulose-heteropoly acid proton exchange membrane is applied in an electrochemical sensor, a storage tank structure is not needed, there is no electrolyte loss, the system is simple and there is no influence on a catalysis layer. In addition, because heteropoly acid proton conduction is independent of humidity, the conductivity change value is small under a condition that temperature and humidity change.

The invention relates to a building or wall material suitable for plant growth, in particular to a lightweight foam composite material having the high water storage capacity and achieving continuous water supply. The components of the material comprise two or more of polymer, hydrogel particles, cellulose and hard fiber, and the material is obtained by mixing and foaming all the components; holesformed through material foaming and hydrogel or cellulose swelling after water absorption form water channels; after water absorption, the whole volume expansion ratio of the material is smaller than5%. The material is high in water storage capacity, high in strength, small in contour expansion after water absorption, good in water mobility and suitable for plant growth.

The invention discloses a preparation method of multilayer antibacterial fibers based on negative ions. The preparation method comprises the following steps of adding bamboo carbon particles into absolute ethyl alcohol, uniformly stirring, and adding ethyl cellulose to form a first slurry; adding chitosan into anhydrous acetic acid, and carrying out low-temperature ultrasonic treatment for 10 to 20min to form a second viscous liquid; performing two-gradient extrusion spinning by taking the second viscous liquid as an outer-layer liquid and the first slurry as an inner-layer liquid to obtain afirst fiber yarn; adding polyvinyl alcohol into distilled water, stirring at a constant temperature to form a dissolving solution, spraying the dissolving solution on the surface of the first fiber yarn, standing at a constant temperature for 10-20 minutes, and heating and sintering for 10-20 minutes to obtain a second fiber yarn; and soaking the second fiber yarn in the absolute ethyl alcohol, and performing low-temperature ultrasonic treatment for 10-20min to obtain the multilayer antibacterial fiber. An insoluble system formed after high-temperature polymerization of the polyvinyl alcohol is utilized to cure an antibacterial material in the inner layer, and meanwhile, a stable internal adsorption antibacterial system is formed based on the adsorbability and electronegativity of bamboo carbon particles in combination with the characteristics of chitosan.

The invention relates to a baking vanish paint coating a metal surface. The baking vanish paint comprises, by weight, 40 to 50% of acrylic resin, 18 to 25% of amino resin, 6 to 12% of cellulose resin and 3 to 4% of an auxiliary agent, with the balance being a solvent, wherein the solvent is prepared by mixing xylene and ethyl ester according to a weight ratio of 50-60%: 40-50%, the cellulose resin is a resin solution with a concentration of 60%, and the auxiliary agent is one or more selected from the group consisting of a drier, a flexibilizer, an antifoaming agent, a leveling agent, a light stabilizing agent, etc. According to the invention, cellulose is added in novel process for the baking vanish paint coating the metal surface so as to form a novel accelerated-drying paint, so the problem of difficult construction is overcome; and only 30 min is needed from spraying of the baking vanish paint on a workpiece to drying of the workpiece and taking of the workpiece off from a production line, so production and coating time is shortened by about 20 min, output is greatly increased, and energy consumption is substantially reduced.

The invention relates to a method for preparing a fiber-loaded lignin composite adsorption material and belongs to the field of biomass resource utilization and technology. On the hydrolysis conditions, a softened layer is formed between lignin and cellulose; under the effects of sulfur smudging and high temperature, the upper cellulose forms a pore state, the lower lignin undergoes a viscous reaction with sodium chloride and polyaspartic acid water-absorbent resin, so that generated substances enable the cellulose to tightly adhere to the lignin, a structure with the surface only provided with carbonized chemical groups is formed, and the porous surface carbonized cellulose has an adsorption function and can undergo a chemical adsorption reaction with some heavy metals and organic matter remaining in slightly polluted water, so as to transfer surface complexation substances. The method is simple to operate and free of any environmental pollution in the process, the manufactured carbonized cellulose is remarkable in adsorption effect, and it is finally measured that the content of the heavy metals in the slightly polluted water is below 0.8 mg/L.

Composite particles comprising at least one type of polymer particles having surfaces that have thereon coatings formed of finely-disintegrated cellulose, with the polymer particles and the finely-disintegrated cellulose being inseparably bonded together.

The invention relates to the technical field of material modification, and discloses a method for modifying anionic waterborne polyurethane emulsion with carboxyl nanocellulose. The method comprises the following steps: 1) oxidizing microcrystalline cellulose with sodium persulfate to prepare carboxyl nanocellulose, and forming carboxyl nanocellulose dispersion liquid; (2) mixing the carboxyl nanocellulose dispersion liquid obtained in the step (1) with an anionic waterborne polyurethane emulsion; and (3) carrying out ultrasonic treatment on the carboxyl nanocellulose dispersion liquid obtained in the step (2) and the anionic waterborne polyurethane mixed emulsion to obtain the stable carboxyl nanocellulose modified anionic waterborne polyurethane emulsion. The method of the invention has the advantage of simple preparation process and is easy for industrial production; and the carboxyl nanocellulose is added into the anionic waterborne polyurethane, so the mechanical properties and the water resistance of the anionic waterborne polyurethane can be further improved.

A virus removal membrane is formed from cellulose, in which, when a solution containing gold colloids having a diameter of 20 nm is applied through a primary surface to the virus removal membrane to allow the virus removal membrane to capture the gold colloids for measurement of brightness in a cross section of the virus removal membrane, a value obtained by dividing a standard deviation of a value of an area of a spectrum of variation in the brightness by an average of the value of the area is 0.01 or more and 1.5 or less; and a thickness of a portion, where gold colloids having a diameter of 20 nm or more and 30 nm or less are captured, in the cross section of the virus removal membrane in a wet state is 10.0 μm or more and 30.0 μm or less.