105results about "Pulp properties modification" patented technology

Natural bamboo is chemically treated to remove at least some lignin therefrom. As a result, the bamboo becomes more porous and less rigid, while otherwise retaining the aligned microstructure of bamboo fibers and constituent cellulose nanofibers. In some embodiments, the treated bamboo can then be pressed such that the lumina therein at least partially collapse, thereby improving the strength and toughness of the bamboo among other properties. In some embodiments, the treated bamboo can be infiltrated with a polymer or polymer precursor, and / or have non-native particles added to surfaces thereof to tailor properties of the resulting bamboo structure. By further modifying, manipulating, or machining the treated bamboo, it can be adapted to various applications.

The present disclosure relates to methods of processing non-wood plant biomass to produce microfibrillated cellulose. The present disclosure also relates to microfibrillated cellulose produced by those methods, and their uses.

A method of manufacturing an article at least partially made of cellulose fibers comprises inserting a cellulose pulp comprising cellulose fibers and water into a mixing cavity; applying a high shear mixing action to the cellulose pulp using a high-shear mixer, such that a foam blend comprising cellulose fibers, water and air bubbles is created; inserting the foam blend into a mold cavity; and molding the article by heating the foam blend contained within the mold cavity.

A method for preparing a thermoplastic composition comprising grafted cellulose and optionally grafted hemicellulose is disclosed. The method includes providing a composition comprising cellulose and optionally hemicellulose, dissolving the cellulose and optionally hemicellulose of the composition at least partially, thereby obtaining a solution comprising solubilized cellulose and optionally solubilized hemicellulose, extruding the cellulose and optionally hemicellulose into a shape, such as a filament, a bead, a 3D object, or a molded article, and treating the shape with cyclic ester monomer, such that the cyclic ester monomer reacts with the cellulose and optionally hemicellulose contained in the shape, thereby at least partially grafting the cellulose and optionally hemicellulose with the cyclic ester monomer, thereby obtaining a thermoplastic composition.

Natural bamboo is chemically treated to remove at least some lignin therefrom. As a result, the bamboo becomes more porous and less rigid, while otherwise retaining the aligned microstructure of bamboo fibers and constituent cellulose nanofibers. In some embodiments, the treated bamboo can then be pressed such that the lumina therein at least partially collapse, thereby improving the strength and toughness of the bamboo among other properties. In some embodiments, the treated bamboo can be infiltrated with a polymer or polymer precursor, and / or have non-native particles added to surfaces thereof to tailor properties of the resulting bamboo structure. By further modifying, manipulating, or machining the treated bamboo, it can be adapted to various applications.

The present disclosure provides methods for treating biowaste and similar waste sources with nitric acid. Where the waste source includes plant-based fibrous materials, animal and food waste, the present methods provide for the extraction and use of nanostructured cellulose (nanocellulose) with an anionic surface charge for adsorption of cationic contaminants such as ammonium, and selective environmentally friendly methods for the functionalization of cellulosic biomass.

The invention relates to a paper for decorative coating materials, containing cellulosic fibres and synthetic fibres, the synthetic fibres containing at least one polymer and at least one pigment, and the mass ratio of pigment to polymer in the synthetic fibres being 1: 10 to 1: 1. Furthermore, the invention relates to a decorative paper or a decorative film containing the paper according to the invention, and to a method for producing the paper according to the invention, comprising the following steps: (a) providing a pulp mixture, (b) grinding the pulp mixture to a grinding degree of 10 to 45 DEG SR, (c) selectively adding a filler and a wet strength agent to the ground pulp mixture obtained in (b), (d) diluting the mixture obtained in (c), (e) selectively adding auxiliaries, (f) forming a fibrous non-woven fabric, (g) dewatering and drying the fibrous non-woven fabric to obtain the paper, in which synthetic fibers containing at least one polymer and at least one pigment are added after step (d) and before step (f), and in which the mass ratio of pigment to polymer is from 1: 10 to 1: 1.

The invention discloses a method for manufacturing a barrier film comprising highly refined cellulose, the method comprising the steps of: a) providing a web comprising at least 50 % of highly refined cellulose having a Schopper-Riegler (SR) value in the range of 80 – 100, which web has a density in the range of 700-1500 kg / m3, and a wet tensile strength retention (MD) of less than 15%, b) applying an aqueous-based solution or dispersion comprising a polymer on the web, which aqueous based solution or dispersion has a solid content of between 5 – 50 wt%, and c) drying the web applied with the aqueous-based solution or dispersion to a solid content of at least 80 wt%, thereby forming the film.

The present disclosure relates to fibrillated fibers and a method for preparing the same. In the present disclosure, there is provided a preparation method capable of providing fibers suitable for complexing with plastics in a more simplified process. According to the preparation method of the present disclosure, microfibers can be easily miniaturized with little energy by growing fine particles on the microfibers to fibrillate the microfibers, and then applying a shear force thereto, and various physical properties can be expressed from the grown fine particles.

The application provides a modified bamboo pulp, a preparation method and application of the modified bamboo pulp in a bamboo pulp roll for a paper pulp molding direct-press process. The mass ratio of short fibers and long fibers in the bamboo pulp is 45-75:55-25 by utilizing the more compact cross-linking characteristics between the short bamboo fibers, and the bamboo pulp is modified by adding a pulp modifier with a mass fraction of 0.1%-0.5% of the bamboo pulp, wherein the pulp modifier is a mixture of a vinyl alkyl polymer, an imidazoline quaternary ammonium salt, an ester quaternary ammonium salt and sodium hydroxide, so that the tightness of the modified bamboo pulp is 0.65-0.70 g / cm 3 , the stiffness is 25-55 mN.m, the swelling of the fibers in the modified bamboo pulp is uniform, and the binding force is better, and the compactness between the fibers is further improved by the fine components in the bamboo pulp and the addition of auxiliary reagents; the three-dimensional structure of the fibers in the bamboo pulp roll produced by using the modified bamboo pulp is more uniform and the compactness is higher, so that the uniformity of the thickness is ensured, and the dimensional stability and mechanical performance indexes of the bamboo pulp roll for the paper pulp molding direct-press process are met.

The present invention relates to a process for producing a fibrous material with improved dewatering behavior. The fibrous material produced according to the present invention is useful in the preparation of for example films and coatings. The fibrous material can be produced from a suspension comprising MFC or highly refined pulp, from which a part of the solids is removed, followed by heat treatment carried out on the suspension and / or on a wet web formed from the suspension.

An improved grinding method for manufacturing microfibrillated cellulose.

The present invention relates to a highly refined cellulose pulp (HRC) composition for preparation of barrier papers or films, said composition comprising: 50-99 wt% HRC having a Schopper-Riegler number (SR) > 70, as measured according to the standard ISO 5267-1, and 1-50 wt% of compression refined cellulose pulp having a Schopper-Riegler number (SR) < 30, as measured according to the standard ISO 5267-1, and a water retention value (WRV) > 120%, as measured according to the standard ISO 23714, based on the total dry weight of the HRC composition. The invention further relates to an HRC paper or film and a multilayer material comprising the HRC composition.

The present disclosure relates to a polymer complex. According to the present disclosure, there is provided a polymer complex capable of exhibiting excellent mechanical properties while being environmentally friendly by including cellulose fibers as a reinforcing material.

This wax is a wax particle used in an oil-resistant agent for pulp, and has a median diameter (D50) of 0.01-1 µm, as measured by a laser diffraction scattering method, and this oil-resistant agent for pulp is a water-dispersible composition, contains a wax and a dispersant, and has a median diameter (D50) of 0.01-1 µm. Consequently, provided is a novel wax or oil-resistant agent for pulp, with which oil resistance can be imparted to a pulp substrate.

Aspects of the present disclosure may include a method to produce carboxylate-rich lignified cellulose nanofibers from plant fiber biomass, including: combining plant fiber biomass, TEMPO agent and NaBr in water; adding NaClO to said water, at a concentration of at least 20 mmol per g of biomass to form a reaction mixture; obtaining a reacted plant fiber biomass; and homogenizing the reacted plant biomass to form carboxylate-rich lignified cellulose nanofibers.

There is provided a manufacturing method for a type II unmodified cellulose fine fiber to obtain a cellulose fine fiber via mercerization of a cellulose, wherein a chemically unmodified cellulose fine fiber can be efficiently obtained by simple steps. A manufacturing method for a type II unmodified cellulose fine fiber is characterized as comprising: a mercerization step of mercerizing a cellulose to obtain a mercerized cellulose; a depolymerization step of reducing a degree of polymerization of the mercerized cellulose to 760 or less to obtain a raw cellulose; a defibration step of defibrating the raw cellulose by adding an alkali metal hydroxide so as to achieve a total concentration of 2.5 to 17.5% to obtain a cellulose fine fiber; and a neutralization step of neutralizing the cellulose fine fiber with an acid.

The invention concerns a method for the production of highly refined or micro- fibrillated cellulose (MFC), comprising the steps of treating cellulosic fibres to remove at least a major part of the primary wall of the fibres, drying the treated fibres, rewetting the treated fibres, and disintegrating the wetted fibres by me- chanical means to obtain the final product. The invention further concerns dried cellulosic pulp as an intermediate product of the method, having an aver- age fibre length of at least 0.4 mm, while less than 50 % of the primary wall material of natural untreated fibres is left in the intermediate product. Instead of transporting large amounts of dilute MFC dispersion the invention enables transport of the dry intermediate product to the MFC end user, who would complete the process by turning the intermediate product to final MFC by use of standard disintegrating devices.

Processes disclosed are capable of converting biomass into high-crystallinity nanocellulose with surprisingly low mechanical energy input. In some variations, the process includes fractionating biomass with an acid (such as sulfur dioxide), a solvent (such as ethanol), and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin; and mechanically treating the cellulose-rich solids to form nanofibrils and / or nanocrystals. The total mechanical energy may be less than 500 kilowatt-hours per ton. The crystallinity of the nanocellulose material may be 80% or higher, translating into good reinforcing properties for composites. The nanocellulose material may include nanofibrillated cellulose, nanocrystalline cellulose, or both. In some embodiments, the nanocellulose material is hydrophobic via deposition of some lignin onto the cellulose surface. Optionally, sugars derived from amorphous cellulose and hemicellulose may be separately fermented, such as to monomers for various polymers. These polymers may be combined with the nanocellulose to form completely renewable composites.

The invention relates to a process for producing a wood fibre material, comprising the steps of: heating wood chips (18) in a pre-cooker (16) by means of water or steam (26), then cooking the wood chips (18) by means of steam (26) in a cooker (14), then fibrising the wood chips (18) in a refiner (32) such that fibre material (34) is produced, wherein some of the steam branches off after fibrising and is used to heat the wood chips (18) in the pre-cooker (16), and also comprising the step of introducing an oxidisation agent (56) into the branched-off steam (26) such that volatile organic substances contained in the steam (26) are oxidised and purified steam (68) is produced, wherein the purified steam (68) is at least partially used to heat the wood chips (18).

This invention relates to a method for manufacturing dried commercial pulp sheets, which includes adding a polymer composition.

The present invention relates to a modified pulp with a moisture content of less than 15% and a certain content of microfibrils and pre-fibrillated fibres. The modified pulp can, after suspension, be used either directly or be subjected to additional refining. The present invention also relates to a method of producing a fibrous product using the modified pulp.

To provide a fibrous cellulose having high reinforcing effect of a resin, a fibrous cellulose composite resin having high intensity, and a method for producing the fibrous cellulose having the high reinforcing effect of the resin.SOLUTION: A fibrous cellulose has an average fiber width of 0.1 μm or more, has some or all of hydroxyl groups substituted with carbamate groups, has a carbamate group substitution rate of 1.0 mmol / g or more, and has a fine rate of 30% or more. The fibrous cellulose composite resin comprises fibrous cellulose and a resin, the fibrous cellulose being the aforementioned fibrous cellulose. Moreover, when producing the fibrous cellulose, a cellulose raw material and urea or the like are heat-treated and some or all of the hydroxyl groups in the cellulose raw material are substituted by the carbamate groups, the fibers are separated until the average fiber width is 0.1 μm or more, the heat treatment is performed such that the carbamate group substitution rate reaches 1.0 mmol / g or more, and the fibers are separated until the fine rate is 30% or more.SELECTED DRAWING: None

The application relates to the technical field of papermaking, and particularly provides high-pressure-resistance low-explosion-rate electrolytic capacitor paper and a production process thereof; the electrolytic capacitor paper comprises the following components: polyethylene terephthalate microfiber 30-50%, modified cellulose short fiber 20-40%, aluminum silicate nanoparticles 5-15%, silane coupling agent 0.5-1.5%, and wet-strength resin 10-25%. The polyethylene terephthalate microfiber is used to construct a high-strength skeleton, the modified cellulose short fiber is used to strengthen the fiber-inorganic interface, the aluminum silicate nanoparticles are used to precisely fill pores, the silane coupling agent is used to enhance the multiphase combination, the wet-strength resin is used to maintain fiber adhesion in a wet state, and the layered gradient pore design is used, so that excellent compression strength and uniform electrolyte immersion are realized, local over-immersion and bubble aggregation are effectively inhibited, the risk of breakdown and explosion is significantly reduced, and the safety and reliability of the capacitor paper under high-pressure long-life working conditions are improved.

A method for preparing a thermoplastic composition comprising grafted cellulose and optionally grafted hemicellulose is disclosed, which includes providing a composition comprising cellulose and optionally hemicellulose, at least partially dissolving the cellulose and optionally hemicellulose of the composition, thereby obtaining a solution comprising solubilized cellulose and optionally solubilized hemicellulose, adding a cyclic ester monomer to the solution, such that the cyclic ester monomer reacts with the solubilized cellulose and optionally solubilized hemicellulose, thereby at least partially grafting the solubilized cellulose and optionally solubilized hemicellulose with the cyclic ester monomer, and coagulating the grafted cellulose and optionally grafted hemicellulose, thereby obtaining a thermoplastic composition.

An object of the present invention is to stably and efficiently provide oxidized cellulose having excellent defibration properties.SOLUTION: The problem can be solved by a method for producing oxidized cellulose containing an oxidized product of a cellulose-based raw material by hypochlorous acid or a salt thereof and substantially not containing an N-oxyl compound and having a degree of polymerization of 600 or less, the method including a step of obtaining oxidized cellulose by oxidizing the cellulose-based raw material using hypochlorous acid or a salt thereof, wherein a viscosity of a slurry of the cellulose-based raw material having the same concentration as that at the time of the oxidation is in a range of 1000 Pa·s or less at 30°C. or 40°C.SELECTED DRAWING: None

The invention discloses a bamboo fiber paper-based material as well as a preparation method and application thereof, and belongs to the field of biomass chemical engineering technologies and environmental remediation. The preparation method comprises the following steps: grinding a bamboo pulp fiber suspension to obtain mechanically modified bamboo fibers, and adding water into absolutely dry bamboo pulp fibers to prepare a mechanically modified bamboo fiber suspension; the preparation method comprises the following steps: respectively dispersing and dissolving polyethyleneimine and glutaraldehyde in water to obtain a polyethyleneimine solution and a glutaraldehyde solution; mixing the bamboo fibers with a polyethyleneimine solution for reaction, adding a glutaraldehyde solution, continuously stirring, and washing to obtain chemically modified bamboo fibers; and defibering the chemically modified bamboo fibers, adding polyamide epichlorohydrin resin and cationic polyacrylamide, and carrying out papermaking and drying treatment to prepare the bamboo fiber paper-based material. The bamboo fiber paper-based material prepared by the method has super-efficient capturing capability on micro-nano plastics, the removal efficiency reaches 99%, the adsorption capacity reaches 250mg / g, the bamboo fiber paper-based material can be popularized and used on a large scale, and the removal cost is greatly reduced.

The invention relates to an adhesive composition in the form of a suspension in water of a microfibrillated cellulose complex and at least one branched polysaccharide, with a dry matter content of between 10% and 40% by weight. This composition is obtained by a method comprising: a step of extruding, in a twin-screw extruder, a mixture of water, cellulose fibers and at least one branched polysaccharide, this mixture containing from 10% to 40% by weight of dry matter, and the ratio of the percentages by weight of branched polysaccharide(s) and cellulose in the mixture being between 5 / 95 and 50 / 50; and, before or during this extrusion step, a step of enzymatically treating the cellulose fibers by means of a cellulase.

Method of forming fibrils from a lignocellulosic substrate, comprising: providing (100) a lignocellulosic substrate; growing (101) mushrooms on the lignocellulosic substrate; harvesting (102) said mushrooms; collecting (103) the lignocellulosic substrate on which the mushroom has been grown, which substrate is a spent mushroom substrate; fibrillating (104) the spent mushroom substrate, forming fibrils. The formed fibrils may be further formed into fibrillar films or foams.