37 results about "Cellulose microfibril" patented technology

The invention discloses a preparation method and application of loofah sponge cellulose fiber aerogel, and belongs to the technical field of aerogel materials. The preparation method comprises the following steps: preparing loofah sponge cellulose fiber with a large number of cellulose microfibrils on the surface layer by taking a natural biomass material loofah sponge fiber as a raw material, and preparing the loofah sponge cellulose fiber aerogel through silane coupling agent hydrophobic modification and vacuum freeze drying. According to the preparation method, the cost can be remarkably reduced, the production process is simplified, the aerogel has high porosity and good self-cleaning performance, various organic solvents and oil pollutants in sewage can be efficiently adsorbed, the adsorption capacity is high, the speed is high, and the adsorbed oil liquid can be kept for a long time without secondary leakage. Meanwhile, the material has good mechanical properties, can be repeatedly used, is easy to degrade after being used, and has wide application prospects in the aspects of environmental governance and biomass resource waste utilization.

The invention discloses an aerogel metamaterial capable of switching electromagnetic wave absorption and deflection reflection wave beam and a preparation method thereof, and the preparation method is characterized in that a metamaterial unit with a loose structure is arranged and comprises a first layer of rectangular pyramid, a second layer of quadrangular frustum pyramid, a third layer of quadrangular frustum pyramid and an internal pyramid cavity; the first layer of rectangular pyramid, the second layer of quadrangular frustum pyramid, the third layer of quadrangular frustum pyramid and the internal pyramid cavity are on the same center line; the bottom surface of the internal pyramid cavity is close to the bottom surface of the third-time quadrangular frustum pyramid, and the vertex of the internal pyramid cavity is close to the vertex of the first-layer quadrangular pyramid; the preparation method comprises the following steps: pouring mixed dispersion liquid containing conductive / magnetic functional components and cellulose microfibers into a mold manufactured according to a set structure, freezing, and then freeze-drying to obtain the metamaterial unit. The obtained aerogel metamaterial solves the problems that the effective absorption bandwidth of aerogel with adjustable electromagnetic wave absorption performance is difficult to substantially break through, and the aerogel cannot have both electromagnetic wave absorption performance and deflection reflection beam performance at the same time.

A composition for manufacturing an electrode, the composition including an electrically conductive carbon-based compound, at least one species able to form a catalyst, and cellulose microfibrils encapsulating chitosan. The cellulose microfibrils create a fibrous mesh binding the composition while limiting coating of the catalyst. Thus, the catalyst remains accessible to the surrounding environment, to allow the redox reactions at the electrode. The electrochemical performances of the electrode are consequently improved. The composition is furthermore particularly adapted for shaping an electrode by 3D printing.

The invention relates to the technical field of bio-refinery, and particularly discloses a method for separating non-condensed lignin with a relatively high beta-O-4 structure retention rate from lignocellulose through mild deconstruction. Lignocellulose is used as a raw material, an aryl sulfonic acid / alcohol solvent and a modifier have a synergistic effect, a deconstruction reaction system is used, and non-condensed lignin is efficiently separated through a microwave-assisted heating reaction; selectively breaking a lignin-carbohydrate compound bond by aryl sulfonic acid; the alcohol component is used for dissolving lignin and forming a pi-pi protection cage; according to the method, imidazolyl cations in the modifier swell cellulose microfibrils, oxalic acid synchronously cracks hemicellulose-lignin ester bonds, meanwhile, excessive breakage of beta-O-4 ether bonds is inhibited, and non-condensed lignin with the high beta-O-4 bond retention rate is obtained by adding water for precipitation. The method not only improves the extraction efficiency and structural integrity of lignin, but also provides an effective way for realizing high-valued conversion of lignocellulose resources.

The invention relates to a meat analogue comprising a combination of hydrated texturised non-animal protein and a binder, said binder comprising cellulose microfibrils, thermally gelling non-animal protein and water. The invention also provides a method for preparing the meat analogue, said method comprising a high-shear treatment step.

The invention discloses a cellulose-based aerogel with dynamic adjustable electromagnetic wave absorption performance and a preparation method thereof.The preparation method comprises the steps that cellulose nanofibers are assembled into cellulose microfibers through physical ice crystal extrusion, a conductive / magnetic conductive path is built by adding functional components, the preparation technology and composition of the cellulose-based aerogel are optimized, and the cellulose-based aerogel with the dynamic adjustable electromagnetic wave absorption performance is obtained. The cellulose-based aerogel with excellent elastic property is constructed, and the adjustable electromagnetic property and the dynamically adjustable electromagnetic wave absorption property under strain amplitude driving are realized. The problems that a traditional electromagnetic wave absorption aerogel material can only work in a specific electromagnetic wave frequency band, and the electromagnetic wave absorption characteristic is difficult to adjust according to scene requirements are solved.

The invention relates to a shaped lipid food composition comprising a combination of non-animal triglycerides, cellulose microfibrils, water and at least one of thermally gelling non-animal protein and / or non-protein emulsifier. The invention also provides a method for preparing the shaped lipid food composition and relates to a food product comprising the shaped lipid food composition.

The invention discloses a battery diaphragm and a preparation method thereof, and a secondary battery, and belongs to the field of secondary batteries, the battery diaphragm comprises a base membrane and a nanofiber layer stacked on at least one side surface of the base membrane, the nanofiber layer is prepared from the following components in percentage by mass: 8 to 15 parts of nanocellulose, 9 to 20 parts of second inorganic particles, 0.05 to 0.1 part of second dispersing agent, 0.3 to 0.5 part of second thickening agent, 1 to 2 parts of second binding agent and 0.05 to 0.1 part of second wetting agent. Wherein the nanocellulose is selected from at least one of cellulose microfibrils, nanocellulose crystals and bacterial nanocellulose; the inorganic particles comprise at least one of boehmite particles, aluminum oxide particles, magnesium hydroxide particles, barium carbonate particles, magnesium carbonate particles and zirconium oxide particles. The battery diaphragm has good heat resistance and liquid absorption and retention properties.

To provide a manufacturing method of a concentrate of a cellulose fine fiber dispersion, capable of manufacturing a concentrate with suppressed variation of solid fraction with low environmental load even when using a thin cellulose fine fiber dispersion.SOLUTION: Disclosed is a manufacturing method of a concentrate of a cellulose fine fiber dispersion, including a concentration process of deliquoring the cellulose fine fiber dispersion to obtain the concentrate, in which: an average fiber diameter of cellulose fine fibers in the cellulose fine fiber dispersion is 50-1000nm; in the concentration process, the cellulose fine fiber dispersion is subjected to deliquoring continuously at a processing speed of 1.0 kg-DS / h or over and under 45.0 kg-DS / h; in the concentration process, when measuring a solid fraction of the concentrate in a 10-times sampling, an average value of the solid fraction is 5 wt.% or over and 60 wt.% or under, and a CV value (standard deviation / average value) of the solid fraction is 0.001 or over and 0.300 or under.SELECTED DRAWING: Figure 3

The invention discloses a degradable straw fiber packaging film and a preparation method thereof.The preparation method comprises the following steps that 1, after rice straw is cut into small sections, the small sections are treated through a gradient steam explosion technology, and straw microfibrils are obtained; (2) mixing the straw microfibrils with a deep eutectic solvent, and synchronously performing lignin removal and cellulose esterification reaction to obtain esterified straw microfibrils; the cellulose content of the esterified straw microfibril is 30%-35%, and the ester group substitution degree is 0.5-1.2; and (3) carrying out hot calendaring molding on the esterified straw microfilaments to prepare the degradable straw fiber packaging film. The method overcomes the defects that a lignin-cellulose compact cross-linked structure in the straw is difficult to dissociate efficiently, the tensile strength of the film is low, and the cellulose microfibril interface is high in hydrophilicity, so that the fiber film is softened and loses efficacy when encountering water and the like.

The invention relates to a gelled proteinaceous food composition comprising a combination of thermally gelling non-animal protein, cellulose microfibrils and water. The invention also relates to a method for preparing the gelled proteinaceous food composition and to a food product comprising the gelled proteinaceous food composition.

The invention discloses a battery diaphragm, a preparation method thereof and a secondary battery, and belongs to the field of secondary batteries, and the battery diaphragm comprises a base membrane, a nanofiber layer and a thermosensitive layer which are stacked in sequence. The base film is prepared from polyethylene with the molecular weight of 1.5 million to 3 million. The thermosensitive layer comprises 5-10 parts of a thermosensitive polymer, 15-20 parts of first inorganic particles, 0.05-0.1 part of a first dispersing agent, 0.3-0.5 part of a first thickening agent, 2-5 parts of a first binder and 0.05-0.1 part of a first wetting agent, and the thermosensitive polymer is selected from polyethylene wax and / or an ethylene copolymer. The nanofiber layer comprises nanocellulose and second inorganic particles, and the nanocellulose is selected from at least one of cellulose microfibrils, nanocellulose crystals and bacterial nanocellulose; the inorganic particles are selected from at least one of boehmite, aluminum oxide, magnesium hydroxide, barium carbonate, magnesium carbonate and zirconium oxide. The diaphragm has low-temperature closed pores and high-temperature dimensional stability.

A network of microfibers are fabricated with a core-shell construction from sustainable materials, where the core includes a phase-change material, such as coconut oil, and the shell includes a biomass, such as cellulose. The microfibers are made via a wet-wet electrospinning process utilizing a coaxial spinneret with an inner conduit and an outer conduit. The biomass and the phase-change material are coaxially extruded into a coagulation bath including a mixture of ethanol and water. The collected microfibers exhibit a beaded structure of PCM aggregates and biomass connecting regions between the aggregates and are effective to aid in the thermoregulation of the immediate environment surrounding the network. The microfibers are suitable for use in a variety of sustainable products such as wearable thermoregulating textiles, wall / ceiling panels, insulation, packaging material, and more.

[Problem] To provide a manufacturing method for obtaining type II unmodified cellulose microfibers through mercerization of cellulose, wherein chemically unmodified cellulose microfibers can be obtain

The invention discloses a bamboo cellulose micro-nano fiber composite aerogel material and a preparation method and application thereof, and relates to the field of aerogel, the preparation method comprises the following steps: S1, crushing bamboo pulp to obtain bamboo pulp microfibers; s2, adding the bamboo pulp microfiber and bamboo cellulose nanofiber suspension into water, and stirring; s3, sequentially adding silicon dioxide, polysiloxane and boric acid into the dispersion liquid to obtain a premix; s4, adding a polyvinyl alcohol aqueous solution and a glutaraldehyde aqueous solution at room temperature to obtain a reactant; s5, pouring reactants into a mold, and freezing and forming to obtain ice gel; and S6, replacing the ice gel with ethanol, and drying at normal pressure to obtain the composite aerogel material. According to the method, cellulose does not need to be dissolved, cellulose microfibers serve as a firm framework, interpenetrating double networks are constructed through physical entanglement, physical / covalent cross-linking and ice crystal template constraint, multi-scale material interface assembly is achieved, and the composite material can be easily prepared under normal-pressure drying and is expected to serve as a sustainable substitute of plastic foam.

The invention relates to the field of producing moulded cellulose-based packages and more particularly to a method for producing a cellulose-based product and to the cellulose-based product produced in this way. The production method 10 is essentially such that it comprises the following steps: • providing 12 a preformed cellulosic structure; • providing 14 a nanocellulosic pulp with a cellulose nanofibril concentration of substantially 5 to 50% by weight of solids of the nanocellulosic pulp; • depositing 16 a layer based on the provided nanocellulosic pulp on a surface of the preformed cellulosic structure; and • drying 18 the layer based on the nanocellulosic pulp by means of thermocompression. The cellulose-based product produced is essentially such that it comprises: • a preformed cellulosic structure; and • a layer based on cellulose microfibrils on at least one surface of the preformed cellulosic structure.

The invention belongs to the technical field of synthetic biology and biological materials, and particularly relates to a cellulose synthetase high-efficiency expression system based on a cell membrane adaptation strategy, and a preparation method and application of cellulose microfibrils. The method is used for efficient heterologous expression of cellulose synthetase subunits PtCesA1 and PtCesA8 from populus trichocarpa, and in-vivo synthesis of cellulose microfibrils is realized. The key enzyme NMT of a phosphatidylcholine synthesis route is introduced to modify the escherichia coli cell membrane lipid composition, so that the expression efficiency and the cellulose synthesis capability of the eukaryotic-source membrane protein are remarkably improved. Further, the cellulose yield is remarkably increased by systematically optimizing culture conditions such as concentration, temperature and time of the inducer. The system constructed by the invention can be used for directly synthesizing cellulose microfibrils with an ordered structure and high purity in escherichia coli, and a new path is provided for green biological manufacturing of cellulose.

The application relates to a cotton fiber strength major gene NTL9 BS41 and application thereof. Through cotton transgenic technology, NTL9 BS41 is successfully introduced into Gossypium hirsutum and high expression of the gene in cotton fibers is realized, the fiber strength of cotton is significantly enhanced without negative influence on other fiber qualities, overexpression of NTL9 BS41 can effectively enhance the density and uniformity of cellulose microfibril accumulation, and the structure and performance of cotton fibers are significantly optimized. In addition, the gene is derived from Gossypium barbadense, compared with Gossypium hirsutum, there is an insertion type variation of 24 bp nucleotides in the CDS of the gene, and a molecular marker capable of effectively distinguishing Gossypium hirsutum and Gossypium barbadense haplotypes is successfully developed. The application provides new gene resources, technical means and germplasm resources for cotton fiber quality improvement, and has far-reaching application value and potential for promoting the progress of cotton breeding work.

Title: Method for manufacturing a cellulose-based product and product manufactured from cellulose The invention relates to the field of manufacturing molded cellulose-based packaging and more particularly to a method for manufacturing a cellulose-based product and the product manufactured from cellulose. The manufacturing method 10 is essentially such that it comprises the following steps: Providing 12 a preformed cellulose structure,Providing 14 a nanocellulose pulp at a concentration of cellulose nanofibrils substantially between 5 and 50% by weight of dry matter of the nanocellulose pulp,Depositing 16 a layer based on the provided nanocellulose pulp on a surface of the preformed cellulose structure, andDrying 18 the layer based on the nanocellulose pulp by thermocompression.The cellulose-based product is essentially such that it comprises: A preformed cellulose structure, andA layer based on cellulose microfibrils on at least one surface of the preformed cellulose structure. Figure for abstract: Fig. 1.

Provided is a method for producing type II unmodified cellulose microfibers, which is a method for producing cellulose microfibers by mercerizing cellulose, and which can efficiently produce unmodified cellulose microfibers by a simple process. The method for producing type II unmodified cellulose microfibers is characterized by having the following steps: a defibrillation step in which defibrillation is performed by adding an alkali metal hydroxide to raw material cellulose subjected to a mercerization step of mercerizing cellulose to obtain mercerized cellulose and a depolymerization step of reducing the degree of polymerization of the mercerized cellulose to 760 or less, such that the total concentration is 2.5 to 17.5%, thereby obtaining cellulose microfibers; and a neutralization step in which the cellulose microfibers are neutralized with an acid.

Provided is a raw material having an anti-contamination effect. Cellulose microfibers are used as an additive for an anti-pollution external skin preparation having an anti-pollution effect. In addition, an anti-pollution external preparation for the skin is provided using the additive. The cellulose microfibers are preferably chemically modified cellulose microfibers.

Provided are cellulose microfibers (fibrous cellulose) that can be used in a general-purpose manner for a variety of applications and that have a uniform fiber diameter distribution and a low proportion of both cellulose nanofibers and coarse structures, a composition containing said cellulose fibers, and a porous body composed of said cellulose fibers. The present invention relates to cellulose fibers in which the average fiber diameter in a dry state is 0.3-3.0 um as observed using an electron microscope, the proportion of fibers having a fiber diameter of less than 0.1 um is 5% or less, and the proportion of coarse structures as indicated by the proportion of fibers having a wet fiber diameter of 20 um or greater measured through automatic optical analysis is 3.0% or less. The present invention also relates to a composition containing said cellulose fibers, and a porous body composed of said cellulose fibers.

To provide a herbicidal composition that enables enhanced herbicidal effects through the use of materials having low environmental impact.SOLUTION: A soil treatment-type herbicide is used in combination with cellulose microfibers to provide a herbicidal composition. Preferably, the cellulose microfibers are chemically modified.SELECTED DRAWING: Figure 1

To provide a technique to improve a strength of a weak cellulose fiber and improve certain properties of paper, corrugating medium pulp and pulp products.SOLUTION: Some variations provide a new nanolignocellulose composition comprising, on a bone-dry, ash-free, and acetyl-free basis, from 35 wt.% to 80 wt.% cellulose nanofibrils, cellulose microfibrils, or a combination thereof, from 15 wt.% to 45 wt.% lignin, and from 5 wt.% to 20 wt.% hemicelluloses. The hemicelluloses may contain xylan or mannan as the major component. Novel properties arise from the hemicellulose content that is intermediate between high hemicellulose content of raw biomass and low hemicellulose content of conventional nanocellulose. The nanolignocellulose composition is hydrophobic due to the presence of lignin. Processes for making and using the nanolignocellulose compositions are also described.SELECTED DRAWING: Figure 2

The present invention provides a sinterable inorganic material-containing composition that offers excellent handling during slip casting, as well as superior moldability and shape retention of the wet molded body obtained by injecting the slurry into a mold, and enables the production of sintered ceramic products with high strength. [Solution] The sinterable inorganic material-containing composition of the present invention contains cellulose microfibers satisfying the following conditions (a) to (d), and a sinterable inorganic material, wherein the amount of cellulose microfibers added per 100 parts by mass of the sinterable inorganic material is less than 2.0 parts by mass. (a) Number-average fiber diameter is between 2 nm and 500 nm. (b) Average aspect ratio is between 30 and 300 (c) Having 70-100% cellulose type II crystal structure (d) Having anionic functional groups

A liquid fertilizer composition includes an aqueous phase, dispersed cellulosic fibers including carboxylated cellulose microfibers and / or carboxylated cellulose nanofibers, dissolved nitrogen that includes nitrate and optionally ammonium, dissolved phosphorus, dissolved potassium, oxidized organic carbon compounds, and a nitro-oxidized effluent.

Provided is a dried cellulose microfiber (fibrous cellulose) which has an extremely small proportion of coarse structures, has a uniform fiber diameter distribution, and is versatilely usable for various purposes. A dried cellulose fiber according to the present invention is characterized in that: the average fiber diameter is 0.3-3.0 μm; and the proportion of coarse structures, which is indicated by the proportion of the number of fibers having a wet fiber diameter of at least 20 μm as measured by optical automatic analysis after water dispersion, is at most 3.0%.

The invention relates to a cotton fiber strength major gene NTL9BS41 and application thereof. Through a cotton transgenic technology, the NTL9BS41 is successfully introduced into upland cotton and high-quantity expression of the NTL9BS41 in cotton fibers is realized, the fiber strength of the cotton is remarkably enhanced without negative influence on the quality of other fibers, the accumulation density and uniformity of cellulose microfibrils can be effectively enhanced by over-expression of the NTL9BS41, and the structure and performance of the cotton fibers are remarkably optimized. Besides, the gene is derived from sea island cotton, and compared with upland cotton, the gene CDS has insertion type variation of 24bp nucleotide, so that the molecular marker capable of effectively distinguishing haplotypes of the upland cotton and the sea island cotton is successfully developed. The invention provides new gene resources, technical means and germplasm resources for cotton fiber quality improvement, and has profound application value and potential for promoting the cotton breeding process.

The invention discloses a method for preparing high-purity xylooligosaccharide from low-concentration trifluoroacetic acid in cooperation with xylanase, and belongs to the technical field of bioactive substance conversion. The method comprises the following steps: crushing and sieving a wood fiber raw material, mixing with trifluoroacetic acid, carrying out a catalytic reaction, carrying out rotary evaporation to recover trifluoroacetic acid, adding xylanase into a residual solid-liquid mixture, carrying out an enzymatic hydrolysis reaction, carrying out solid-liquid separation, and carrying out enzyme inactivation, filtration, decoloration, concentration treatment and spray drying on enzymatic hydrolysate to obtain xylooligosaccharide powder. The used trifluoroacetic acid permeates into the raw materials, hydrolyzes ester bonds and hydrogen bonds between hemicellulose and lignin, part of low-molecular-weight xylan and lignin are dissolved, wrapped cellulose microfibers are exposed, the structure of the raw materials becomes loose and porous, the accessibility is greatly improved, trifluoroacetic acid has high volatility, and the preparation method is suitable for industrial production. The xylooligosaccharide can be recycled through distillation, so that the cost and the product purification difficulty are reduced, and the purity of the xylooligosaccharide product is improved.

Provided are cellulose microfibers (fibrous cellulose) which have a uniform fiber diameter distribution in which the proportion of both cellulose nanofibers and coarse structures is low and which can be widely used in various applications, a composition containing the cellulose fibers, and a porous body formed from the cellulose fibers. The present invention pertains to a cellulose fiber having an average fiber diameter of 0.3-3.0 [mu] m (inclusive) in a dry state as observed by an electron microscope, the proportion of fibers having a fiber diameter of less than 0.1 [mu] m being 5% or less, and the proportion of coarse structures being 3.0% or less, the ratio of the thick structures is an index of the ratio of the number of fibers having a Wet fiber diameter of 20 [mu] m or more as measured by optical automatic analysis. The present invention also relates to a composition comprising the cellulose fiber, and a porous body formed from the cellulose fiber.