481 results about "Fiber suspension" patented technology

The present invention provides a method for producing modified nanofibrillated cellulose characterized by bringing cellulosic material into a fiber suspension, adsorbing a cellulose derivative or polysaccharide or polysaccharide derivative onto fibers in said fiber suspension under special conditions and subjecting the obtained fiber suspension derivative to mechanical disintegration. A modified nanofibrillated cellulose obtainable by a method of the present invention is provided. Furthermore, the invention relates to the use of said modified nanotibrillated cellulose.

An apparatus and method are disclosed wherein at least one parameter associated with a core-annular flow (CAF) in a pipe is measured by sensing unsteady pressures associated with undulations formed at the interface of a core region and an annular region in the CAF at different axial locations along the pipe. The at least one parameter, which may include a flow velocity of the CAF, Mach number associated with the CAF, and a volumetric flow rate of the CAF, is determined using sensed unsteady pressures. The CAF may be developed from a shear thinning fluid, such as bitumen froth or from a wood pulp fiber suspension. Alternatively, the CAF may be developed from a lubricating fluid, such as water, and a fluid to be transported, such as oil, where the fluid to be transported forms the core region and the lubricating fluid forms the annular region.

The embodiment of the invention discloses a process for recycling and preparing coated white board paper by using waste paper. The process comprises the following steps of: taking waste paper, repulping, screening, deinking, deslagging, washing and concentrating, whitening, storing in a pulp pool and making paper, wherein the step of repulping comprises the steps of dispersing the waste paper into a fiber suspension liquid, heating the fiber suspension liquid to be at 40-55 DEG C, adding a cellulose liquid and rotating for 20-35minutes so as to conduct primary deinking; the step of deinking comprises a step of further deinking by using an ultrasonic generator; the step of whitening comprises steps of oxidation and reduction whitening; the step of making paper comprises the steps of respectively feeding the whitening pulp into a surface layer, a core layer and a base layer of a paper machine conveying system, respectively making the pulp into three layers by using a paper machine according to the ratio of 38-78wt%, 15-35wt% and 12-30wt%, and subsequently conducting composite paper making so as to manufacture a raw paper board. According to the process, no raw wood pulp is used, so that the resource is saved, the environment is protected, the production cost is lowered, and moreover the produced white board paper is good in whiteness, high in strength and applicable to requirements of high-quality package and decoration.

The present invention is directed to a method of efficiently maintaining or increasing brightness and whiteness of refined paper. In one aspect, the invention is directed to a method for substantially maintaining (or even increasing) brightness and/or whiteness of paper with increased pulp refining, the method including refining the pulp down to reduce the freeness at least about 100 CSF and adding a combination of an OBA and a carrier polymer to the paper surface in the size press in amounts sufficient to increase brightness and/or whiteness of the final paper. In another aspect, the invention is directed to a method of making paper from refined pulp that includes refining a cellulosic fiber suspension to reduce the freeness at least about 100 CSF and contacting the cellulosic fibers with at least one optical brightening agent (OBA) during or after the refining step prior to adding any additional wet end chemicals.

A device treats a fiber stock suspension with at least one additive, the fiber stock suspension being used for production of at least one of paper and cardboard. The fiber stock suspension includes a suspension medium and a fiber material. The fiber material has fiber surfaces, the fiber surfaces being moistened by the suspension medium. The device includes a fluffer having an inlet for receiving at least one of the fiber stock suspension and the at least one additive. The fluffer is coupled to the inlet, the fluffer being configured for separating the fiber material and enlarging a specific surface of the fiber surfaces.

The invention discloses a polymeric nanofiber-based aerogel material and a preparation method thereof, and belongs to the fields of aerogel materials and preparation methods thereof. The preparation method comprises the steps that a thermoplastics polymer and cellulose acetate butyrate are subjected to melt blending, drawing, extracting and the like to prepare polymeric nanofibers, the polymeric nanofibers are added into water or a water solvent prepared from water and an organic solvent to generate polymeric nanofiber dispersion liquid, a cross-linking reaction is conducted to obtain cross-linked polymeric nanofiber suspension liquid, freeze drying is conducted on the cross-linked polymeric nanofiber suspension liquid, and then the polymeric nanofiber-based aerogel material is prepared. The polymeric nanofiber-based aerogel material prepared through the method has the advantages of being obvious in nanofiber porous structure, good in mechanical property and the like. The material prepared through the method can be applied to the fields of air filtration, thermal insulation, adsorption and the like directly or by being composited with other materials.

The invention discloses a production method of a meta-position aramid paper fibrid. The production method comprises the following steps of: polymerizing m-phenylenediamine and isophthaloyl chloride in DMAC (M, N-dimethylacetamide) to form PMIA (polyisophthaloyl metaphenylene diamine) resin); producing hydrogen chloride gas by a neutralization reaction; diluting the resin, dispersing in a mother liquor and precipitating to obtain a fibrid suspending liquid in accordance with the manufacturing conditions of the meta-position aramid paper; pumping the fibrid suspending liquid and deionized water into a washing and filtering machine, and removing the solvent, additive and moisture containing in the fibrid to obtain the fibrid in accordance with the manufacturing conditions of the meta-position aramid paper. The method has advantages of low cost, high efficiency, stable process, simple used equipment and suitability for sustainable industrial production.

The invention relates to a preparation method of a plant fiber foaming composite material. By taking plant fiber, an anionic surfactant and a water-soluble polymer foaming agent as raw materials, the preparation method mainly comprises the working procedures of preparation and mixing of a water-soluble polymer aqueous solution stabilizer, as well as forming, drying molding of plant fiber suspension liquid and plant fiber foams. The preparation method comprises the steps of: adding the water-soluble polymer stabilizer into a certain amount of water, stirring and dissolving at a certain temperature to form an aqueous solution with mass fraction of 1%-20%; adding a certain amount of plant fiber into the aqueous solution of the water-soluble polymer stabilizer, mechanically stirring at the room temperature so that the plant fiber is dispersed uniformly to form the plant fiber suspension liquid; adding the anionic surfactant into the plant fiber suspension liquid, mechanically stirring at a high speed and foaming to form a plant fiber foaming system; and pouring the plant fiber foaming system into a mould, drying and molding at 60-120 DEG C to prepare the plant fiber foaming composite material with a three-dimensional network structure. The main raw material plant fiber needed by the preparation method is abundant and low in price and can be recycled, the production process does not pollute the environment, and the product is stable in performance and light in weight.

The invention discloses a technique for preparing cellulose nano fiber aerogel microspheres by ultrasonic atomization. The technique comprises the following steps: defibering bleached coniferous wood sheet pulp, adding tetramethyl piperidine oxide, sodium hypochlorite and sodium bromide, and carrying out oxidation reaction for 2-4 hours under the pH value of 9.5-11; carrying out ultrasonic dissociation on the oxidated pulp to prepare a cellulose nano fiber suspension; and adding a crosslinking agent into the cellulose nano fiber suspension, pouring into an atomization cup of an ultrasonic atomizer, blowing the atomized oxidated nano cellulose fog drops containing the crosslinking agent and tetramethyl piperidine oxide into a liquid-nitrogen-filled container, carrying out freeze-drying on fast-frozen ice microspheres, and finally, carrying out crosslinking reaction on the dried aerogel microspheres at 110-130 DEG C for 2-4 hours, thereby obtaining the cellulose nano fiber aerogel microspheres.

The invention provides a method for preparing chopped fiber continuous orientation felt and belongs to the field of fiber fabric. The method comprises the following processes: dispersion, orientation, separation, drying and rolling, wherein in the orientation process: a chopped fiber suspension dispersed in a storage device is introduced into reducing orientation nozzles and is spread on conveying mesh belt running continuously after passing through the reducing orientation nozzles; in the separation process: moisture and a dispersant in the chopped fiber suspension on the conveying mesh belt are separated by negative pressure suction box located below the conveying mesh belt, and wet chopped fiber continuous orientation felt is obtained after washing. The device has high degree of automation, the prepared chopped fiber continuous orientation felt is high in controllability of thickness, width, length and fiber content, the orientation degree of chopped fibers in the chopped fiber continuous orientation felt is high, and the orientation structure is uniform; the device is energy-saving, environment-friendly, high-quality and efficient, the problems of low production efficiency and the failure in continuous and large-scale production are solved, and technical guarantee is provided for industrial application of the chopped fiber orientation felt.

The invention relates to a preparation method of a ceramic fiber porous combustion medium with a gradient pore structure. The preparation method comprises the following steps: respectively preparing a ceramic fiber suspension with different lengths or diameters by using ceramic fibers with different lengths or ceramic fibers with different diameters; carrying out suction filtration on the suspension to obtain ceramic fiber papers with different pore structures; laminating the ceramic fiber papers with a gradient pore structure (the fiber papers with a large pore structure are laminated at the upper portion, and the fiber papers with a small pore structure are laminated at the lower portion) according to a certain rule, and applying a certain pressure to obtain a ceramic fiber felt with a certain thickness and a gradient pore structure; and preparing a ceramic phase matrix on the ceramic fiber felt through a chemical vapor deposition (CVD) technology or a polymer infiltration pyrolysis (PIP) technology, and connecting ceramic fibers to obtain the ceramic fiber porous combustion medium with a gradient pore structure. The gradient pore structure makes a gas fuel be premixed in the upstream small pore zone and be combusted in the downstream large pore zone, so the combustion stability is improved, and the lean combustion limit is widened.

The invention discloses a method for preparing aramid nanofibers. Para-aramid fibers and KOH are added into DMSO (dimethylsulfoxide) solution to obtain a mixed system of para-aramid fibers, KOH and DMSO; the mixed system of para-aramid fibers, KOH and DMSO is ultrasonically treated in an ice water bath to obtain a para-aramid fiber suspension A; water is added into the para-aramid fiber suspensionA to obtain a para-aramid fiber suspension B; after being sealed, the para-aramid fiber suspension B is stirred to obtain an ANFs/DMSO (aramid nanofibers/DMSO) solution; the ANFs/DMSO solution is subjected to colloidal titration through a cation standard liquid; whether a reaction endpoint is reached is judged according to cation demand; if the reaction endpoint is reached, aramid nanofibers areprepared; if the reaction endpoint is not reached, the previous step is repeated until the reaction endpoint is reached. The method has the advantages that reaction time is shortened greatly, reactionconcentration is increased, reaction efficiency is improved evidently, and the method is easy to apply to large-scale production.

The invention belongs to the crossing field of lithium ion battery diaphragms and biomass materials and specifically discloses a hollocellulose lithium ion battery diaphragm and a preparation method thereof. The preparation method comprises the steps: taking nano fibril cellulose, nano microcrystalline cellulose and cellulose derivative according to different mass fractions, dispersing into water and dispersing evenly by ultrasonic wave to obtain fiber suspension; preparing the fiber suspension into a wet diaphragm by a suction filtration method, hot pressing the wet diaphragm and performing vacuum drying on the wet diaphragm to obtain the hollocellulose lithium ion battery diaphragm. The prepared diaphragm is a hollocellulose completely-degradable diaphragm, the thickness of the diaphragm is 15 to 45mu m, the porosity is 45 to 80%, electrolyte absorptivity is larger than 400%, an ionic conduction rate is larger than 1.0mS cm<-1>, thermal stability is good, and a size change rate under condition of 200 DEG C for 3h is smaller than 0.1%.

The present invention is directed to an apparatus used in the formation of paper. More specifically the present invention is directed to an apparatus, system, and method for lowering the consistency or degree of density of fiber suspension on the forming table, and improving the quality and physical properties of the paper formed thereon.

The invention relates to a method for manufacturing chopped carbon fiber reinforced concrete, particularly comprising the following steps: dispersing chopped carbon fiber in aqueous solution of water-soluble cellulose ether; adopting a papermaking method to filter the carbon fiber from carbon fiber suspension by a filter screen or a mop; taking down the dried carbon fiber from the filter screen or the mop; cutting the take-down carbon fiber felt into small blocks with side length being 4-8cm; dry mixing the small blocks with the concrete raw material for 1-4min, then adding water to mix for 1-4min, and finally casting and tightly molding the mixture to obtain the chopped carbon fiber reinforced concrete, wherein the dosage of carbon fiber accounts for 0.2-2.5% of the total volume of the chopped carbon fiber reinforced concrete. The invention is beneficial to blending and dispersing the carbon fiber and the concrete, improving the tightness of the concrete, lowering production cost and mixing a large amount of the chopped carbon fiber reinforced concrete with stable and uniform performance on-site.

The invention discloses a preparation method of a transparent waterproof plant nanometer fiber composite material. By the method, firstly water loss of a nanometer fiber suspension is used to form fiber films, hydrogen bonds of which are mutually bonded to be compact, and then single-layer films are laminated to obtain a high-strength light composite material of a target thickness by using a thermosetting epoxy resin. The laminated composite material prepared by the method disclosed by the invention is excellent in mechanical property, high in specific strength, good in weather fastness and thermal resistance, environment-friendly, and is a biomass nanometer composite material of great potential.

The invention relates to the field of humidity sensor materials, in particular to a nanocrystalline cellulose nano-fiber composite membrane sensitive to humidity and a preparing method thereof. The preparing method of the nanocrystalline cellulose nano-fiber composite membrane sensitive to humidity includes the following steps that cellulose is hydrolyzed by acid to prepare nanocrystalline cellulose suspension, then the nanocrystalline cellulose suspension and thermoplastic polymer nano-fiber suspension are mixed uniformly and then coated on the surface of a base material, a membrane layer is formed on the surface of the base material after drying, and the nanocrystalline cellulose nano-fiber composite membrane sensitive to humidity is obtained after the base material is removed. The nanocrystalline cellulose nano-fiber composite membrane has the advantages of being high in humidity response speed and high in recovery speed.

The invention relates to a dry-wet united web forming compound process. The dry-wet united web forming compound process includes the following steps that a, the preparation before web forming is conducted, clean pure cattle leather is ground to prepare cattle leather fibers through a splitting process; b, the fiber carding is conducted; c, the united web forming is conducted, since the dry-laid web forming and the wet-laid web forming are conducted at the same time, the carded cattle leather fibers are prepared into a mixture of fibers and water through waterpower dispersing, beating, dilution and adding of a dispersing agent, the cattle leather fibers are loosened in the water in a filament form to form fiber suspension pulp, the fiber suspension pulp is transported to a web former, the fiber suspension pulp is tiled on the surface of non-woven fabric in a wet state to form a web, and the formed web is a semi-finished product web; on the semi-finished product web, the cattle leather fibers are blown to the web forming curtain on the semi-finished product web to form a second layer fiber web by the adoption of an airflow clutter web forming method, through the paper-making wet method dewatering, a cattle leather fiber web with the moisture content of 120%+/-5% is formed on the surface of the non-woven fabric, and then the cattle leather fibers composite with the non-woven fabric through the reinforcing of a spun-laced method.

The invention relates to a method for manufacturing formaldehyde-free straw fiber boards, comprising the following steps: adding NaAc-HAc buffer solution in wheat straw chemime chanical pulp so as to dilute the pulp into wheat straw fiber suspension liquid with mass concentration of 3-10%, stirring the wheat straw fiber suspension liquid fully and uniformly, respectively addingndustrial lignin being 10-50% of i of oven-dry wheat straw pulp and wax emulsion being 1-10% of oven-dry wheat straw pulp, then adding 10U/g to 100U/g laccase to start the reaction, scattering the treated wheat straw fiber by an electric mixer, molding in a fiber molding machine and then removing redundant moisture by pre-pressing, and then forming the fiber board by hot-pressing. According to the method, lignin is selected to replace the traditional binder used in the productions of middle-density fiber board and high-density fiber board, and the formaldehyde diffusion is inexistent due to the fact that the formaldehyde based binder is unused. The method of the invention is reasonable and simple in operation; and with the adoption of the waste materials of crops wheat stalk, straw and the like, the environment pollution can be reduced, the added value of the product can be enhanced, and the high-strength formaldehyde-free environment-friendly fiber boards are manufactured.

The invention relates to a preparation method of a nanocellulose fiber/SiO2 composite super-hydrophobic particle. The preparation method comprises 1, preparing a nanocellulose fiber suspension liquid with content of 1-5wt%, carrying out refrigeration molding, and carrying out freeze-drying to obtain nanocellulose fiber aerogel, 2, respectively dipping the nanocellulose fiber aerogel in a solution A and a solution B for 5-30min, 3, dipping the nanocellulose fiber aerogel treated by the step 2 in anhydrous ethanol and dipping the nanocellulose fiber aerogel in n-hexane, and 4, dipping the nanocellulose fiber aerogel treated by the step 3 in a solution C at a room temperature, carrying out drying to obtain nanocellulose fiber/SiO2 composite aerogel in a white solid form and carrying out granulation to obtain the composite super-hydrophobic particle. The invention also relates to the composite super-hydrophobic particle obtained by the preparation method. The invention further relates to a method for preparing a coating from the composite super-hydrophobic particles.

The invention relates to a method for precipitating calcium carbonate, in which method calcium hydroxide is introduced to a fibre suspension containing cellulose-containing fibres, the calcium hydroxide is allowed to attach onto the surfaces of fibres for a pre-determined time, and the aqueous suspension of calcium hydroxide and fibres is brought into contact with carbon dioxide for precipitating the calcium carbonate. The invention also relates to a corresponding system for precipitating calcium carbonate in connection with cellulose-containing fibres. In addition, the invention relates to a fibrous product, which comprises pulp material produced by said method and comprising calcium carbonate.

The invention provides acid free paper special for the historic preservation, consisting of plant pulp fiber, an aggressive gas adsorbing agent, a humidity adjusting agent, a pH buffering agent and a wet strengthening agent, which are mixed according to a certain mass percentage. The preparation method comprises the following steps that: firstly, the plant pulp fiber is added with de-ionized water to be scattered into a fiber suspending liquid; secondly, the aggressive gas adsorbing agent, the humidity adjusting agent, the pH buffering agent and the wet strengthening agent are added into the defibered paper pulp suspending liquid and are stirred evenly; finally, the mixture is formed on a paper sheet-making machine and is filtered and dewatered so that a wet paper disc is obtained; and the acid free paper special for the historic preservation is obtained by drying the wet paper disc. The special acid free paper have no acid substance, adopts the chlorine bleaching free paper pulp, adds calcium phosphate taken as the buffering agent, is alkalescence, has good adsorbing effect of acid gas, has the function of adjusting the humidity of the microspace environment of the protective article, and has the advantage of recycling.