503results about "Pulp properties modification" patented technology

Highly transparent (up to 92% light transmittance) wood composites have been developed. The process of fabricating the transparent wood composites includes lignin removal followed by index-matching polymer infiltration resulted in fabrication of the transparent wood composites with preserved naturally aligned nanoscale fibers. The thickness of the transparent wood composite can be tailored by controlling the thickness of the initial wood substrate. The optical transmittance can be tailored by selecting infiltrating polymers with different refractive indices. The transparent wood composites have a range of applications in biodegradable electronics, optoelectronics, as well as structural and energy efficient building materials. By coating the transparent wood composite layer on the surface of GaAs thin film solar cell, an 18% enhancement in the overall energy conversion efficiency has been attained.

The invention relates to a preparation method of paper, in particular to a preparation method of breathable paper applied to a packaging material. Chitosan and oxidized sodium alginate are subjected to a Schiff base reaction, so that a more open and loose coating layer is formed on the fiber surface, gas circulation is facilitated, and the air permeability of the paper is improved to a certain extent. And a covalent bond formed by Schiff base reaction enhances the binding force between chitosan and oxidized sodium alginate, so that the coating layer is more firmly attached to the surface of wood pulp fiber. The enhanced binding force is favorable for improving the mechanical properties such as tensile strength and breakage resistance of the paper, and an imine bond generated by the Schiff base reaction has higher chemical stability and can resist the influence of changes of external environments such as humidity, temperature and the like on the coating layer, so that the long-term stability of the performance of the paper is kept.

Disclosed are non-wood pulps having a fiber length greater than about 1.70 mm and a brightness of about 80% or greater. The relatively high degree of brightness is achieved without a loss fiber length or pulp yield. The high degree of brightness and relatively long fiber length makes the pulps well suited for the manufacture of wet-laid fibrous products, particularly wet-laid tissue products. The pulps may be prepared from plants of the family Asparagaceae by mechanical pulping and more preferably by a chemi-mechanical pulping using a sodium hydroxide alkaline peroxide solution where the primary pulp is cleaned to reduce debris prior to bleaching. Preferably the cleaned primary pulp has less than about 5% debris prior to bleaching.

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

A polymer-nanocellulose-lignin composite as disclosed comprises a polymer, nanocellulose, and lignin, wherein lignin forms a hydrophobic interface between the polymer and the nanocellulose. In some variations, a process is disclosed for producing a polymer-nanocellulose-lignin composite material, comprising: fractionating lignocellulosic biomass in the presence of an acid, a solvent for lignin, and water, to generate cellulose-rich solids and a liquid containing hemicellulose and lignin, wherein lignin deposits onto fiber surfaces or into fiber pores; mechanically treating the cellulose-rich solids to form a hydrophobic nanocellulose material comprising cellulose fibrils and / or cellulose crystals; hydrolyzing the hemicellulose to generate fermentable hemicellulosic sugars; fermenting the fermentable hemicellulosic sugars to generate a monomer or monomer precursor; polymerizing the monomer to produce a polymer; and combining the polymer with the lignin-coated nanocellulose to generate a polymer-nanocellulose-lignin composite material for use in a wide variety of products.

The invention discloses a preparation method and application of high-purity natural cellulose. According to the method, a pre-cooled phosphoric acid / hydrogen peroxide mixed aqueous solution system is adopted, phosphoric acid is a cellulose intercrystalline swelling reagent, and hydrogen peroxide is an oxidation reagent precursor. The invention provides a cellulose intercrystalline swelling strategy to promote full exposure of hemicellulose embedded in a cellulose crystalline region and further realize deep removal of hemicellulose through acidic hydrolysis dissolution; meanwhile, peroxyphosphoric acid is used for promoting oxidative degradation and dissolution of residual lignin under mild conditions, and the purity of natural cellulose is further improved. The natural cellulose prepared by the method has high purity, and can be applied to the field of manufacturing of high-end cellulose of lyocell grade, acetification grade, nitration grade and the like. The method is mild in condition, simple in process and controllable in process, the cellulose industry is promoted to extend to the high end of a value chain, and the method has a wide application prospect.

Disclosed are methods for the direct production of short fibers using microdecortication processes and the production of densified particles and short fiber products, sourced from hemp or other bast plants, hemp fiber products, methods for the production of hemp fiber-reinforced polymeric materials, and the polymeric materials resulting therefrom. An embodiment of the method for the production of densified hemp fiber products involves microdecortication with the utilization of particle size reduction equipment to cut all or a portion of hemp stalk, bast fiber, and hurd to produce short fibers and particles. Some embodiments make use of microdecortication to cut whole hemp stalk directly into short hemp fiber. Equipment with cutting action may provide for more adequate control of fiber size and aspect ratio while using the whole hemp stalk to produce short fibers, as opposed to the production of short hemp fibers by cutting long hemp fibers originating from decortication.

The invention relates to a preparation method of high-substitution-degree cationic micro-nano cellulose and application of the high-substitution-degree cationic micro-nano cellulose to improvement of water filtering performance of paper. In the enzymolysis pretreatment process, beta-1, 4 glucosidic bonds among glucose molecules are cut off, and more reaction binding sites are created for cationization after cellulose in an amorphous region and a part of crystalline region is hydrolyzed, so that the use amount of chemical reagents can be effectively reduced, and the environmental pollution is reduced. The prepared high-substitution-degree cationic micro-nano cellulose (CMFC) has abundant positive charges, weakens the hydrogen-bond interaction of cellulose molecules, improves the content of nano-fibrillation, and effectively reduces the mechanical preparation energy consumption of the CMFC. CMFC pulp is added into paper pulp fibers, so that pores of the paper fibers are blocked, more filler is intercepted, and the filler is difficult to be completely brought into white water by water flow in the water filtering process, so that the retention rate is increased, and the water filtering performance is effectively improved.

The present technology relates to fluff pulp having improved odor control and methods of making such fluff pulp. A fluff pulp is provided that includes bleached kraft fibers and a copper ion content of from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fibers. The bleached kraft fibers include a length-weighted average fiber length of at least about 2 mm, a copper number of less than about 7, a carboxyl content of greater than about 3.5 meq / 100 grams; an ISO brightness of at least 80; and a viscosity of from about 2 cps to about 9 cps.

A microfiber cellulose solid body of which productivity in kneading treatment has been improved, as well as a method for preparing the microfiber cellulose solid body is provided. The microfiber cellulose solid body is formed by compressing a mixture containing resin powder and microfiber cellulose having an average fiber width of 0.1 to 19 μm, wherein the microfiber cellulose solid body has a volume of 6 to 4000 mm3 and a bulk density of 0.3 to 1.0 g / cm3.

The present invention discloses aramid insulation paper, a preparation method, and applications, relating to the technical field of aramid paper. The present invention utilizes cellulose treated with a treatment agent A and aminosulfonic acid in combination with meta-aramid chopped fibers treated with the treatment agent A to produce aramid insulation paper with excellent mechanical properties and resistance to high-frequency partial discharge and high temperatures.

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 invention relates to a method for producing a microfibrillated cellulose (MFC) web. The method comprises providing an MFC suspension (2) comprising water as suspension medium. A wet MFC web (4) is formed of the MFC suspension by casting on a non-porous support (5). The wet MFC web (4) positioned on the non- porous support (5) is subjected to water removal by means of press dewatering and / or non-contact drying to form a dry MFC web (8). The water removal further comprises at least one induction heating step, wherein each induction heating step comprises heating said wet MFC web (4) by means of an induction heated device (10). The dry MFC web (8) is separated from the non-porous support (5).

The present disclosure provides cellulose based adsorbents and their use in removing impurities from liquids, including water. The celluloses are alkylamine functionalized celluloses which may be contacted with a liquid, including water, to remove impurities therefrom.

The invention discloses a preparation method of in-situ esterified nano cellulose fibrils based on plant straws. Comprising the following steps: mixing deionized water, plant straw powder and a biological compound enzyme preparation, and carrying out enzymatic reaction on the mixed solution to obtain enzyme-pretreated plant straw powder; mixing a deep eutectic solvent with the enzyme-pretreated plant straw powder, and carrying out a dissociation-in-situ esterification reaction on the mixed solution to obtain in-situ esterified holocellulose; mixing deionized water, in-situ esterified holocellulose and an oxidizing agent, carrying out oxidation reaction on the mixed solution, and carrying out suction filtration on the reaction solution to obtain in-situ esterified cellulose; and carrying out mechanical treatment on the aqueous dispersion of the in-situ esterified cellulose to obtain the in-situ esterified nanocellulose fibrils. According to the present invention, the multi-dimensional co-treatment preparation technology integrating biological pretreatment, in-situ chemical modification and mechanical dissociation is adopted, such that the in-situ esterified cellulose fibril can be rapidly, efficiently and environmentally-friendly prepared, the prepared nano cellulose fibril has characteristics of high purity, uniform size and high stability, and the large-scale production can be achieved.

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.

The invention relates to a preparation method of bamboo fibers for filter paper, the filter paper containing the bamboo fibers and a preparation method of the filter paper. The preparation method of the bamboo fiber for the filter paper comprises the following steps: (1) selecting bamboo materials; (2) chemical treatment is conducted, specifically, chemical treatment is conducted on the bamboo wood selected in the step (1) through chemical agents; (3) defibering: defibering the material obtained by chemical treatment in the step (2) to obtain coarse slurry; and (4) screening the coarse pulp obtained in the step (3) to obtain the bamboo fibers. The prepared bamboo fiber has the mechanical property of high elastic modulus, and the air filter paper made of the bamboo fiber has the properties of high breathability, high stiffness and high bulk.

The invention relates to a preparation method of dissolving pulp with uniform cellulose polymerization degree distribution, and belongs to the technical field of dissolving pulp. The preparation method of the dissolving pulp comprises the following steps: (1) raw material pulp pretreatment and grading screening; (2) cold alkali swelling and pulsed electric field cooperative treatment; (3) selective enzymolysis treatment of a compound enzyme system of cleavage enzyme and excision enzyme; and (4) neutralizing and washing the slurry. Compared with the prior art, the preparation method of the dissolving pulp provided by the invention has the advantages that the centralization of a polymerization degree main distribution interval (such as 800-1000) is realized, the standard deviation is obviously reduced, and the cellulose polymerization degree distribution is narrower and more controllable. No organic solvent or strong oxidant is needed in the whole preparation process of the dissolving pulp, the alkali liquor can be recycled, the enzyme preparation can be repeatedly used, and good environment friendliness is achieved.

An object of the present invention is to stably and efficiently provide an oxidized cellulose having excellent fibrillatability. The above object can be achieved by a method of producing an oxidized cellulose, which contains an oxide of a cellulose raw material by a hypochlorous acid or a salt thereof, is substantially free of N-oxyl compounds, and has a degree of polymerization of 600 or less, the method including a step of obtaining an oxidized cellulose by oxidizing a cellulose raw material using a hypochlorous acid or a salt thereof, wherein viscosity of a slurry of the cellulose raw material having the same concentration as when the oxidation is performed is in a range of 1,000 Pa·s or less at 30°C or 40°C.

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.

To provide natural wood material with improved strength and toughness.SOLUTION: Wood material is treated in a chemical process to partially remove lignin from cellulose-based natural wood material, in which cellulose nanofibers of cell walls are aligned. Then, the treated wood material is pressed in a direction intersecting a direction in which lumens extend, such that the lumens are destroyed and residual fluid in the wood material is removed.SELECTED DRAWING: Figure 4

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.

To provide a method for producing carbamate cellulose fibers capable of mass-production.SOLUTION: In producing carbamate cellulose fibers, a pulp sheet containing urea is heated by passing it between a pair of rolls at a speed of 300 to 3000 m / min, and this heating causes denaturation, and multiple sets of the pair of rolls are continuous. A preceding set or sets are a drying part, the following set or sets are a reaction part, and the temperature of the rolls belonging to the drying part is 80 to 130°C, and the temperature of the rolls belonging to the reaction part is 220°C or higher. A method for producing carbamate cellulose fibers, which is characterized in that the number of pairs of rolls is such that the passing time of the drying part is 8 seconds or more and the passing time of the reaction part is 8 seconds or more.SELECTED DRAWING: Figure 1

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.

This disclosure provides a foam comprising at least one structuring component selected from lignin, cellulose fibres (CF), cellulose microfibrils (CMF), and cellulose nanofibrils (CNF), polyelectrolyte, multivalent ions, and closed pores comprising gas, wherein at least some of the polyelectrolytes are present in non-covalent complexes with the multivalent ions, providing a network structure in the foam. There is also provided several manufacturing methods for manufacturing such foams.

The present document discloses a method for producing microfibrillated cellulose (MFC) comprising the steps of: a) provide a refined pulp suspension mixed with an enzyme to a reactor tank; b) treat the refined pulp suspension with said enzyme in the reactor tank at a temperature between 40-80°C under controlled mixing by means of an agitating member thus forming a pre-treated pulp suspension; c) adding at least one oxidant to said pre-treated pulp suspension simultaneous to mixing; d) perform oxidation of said pre-treated pulp suspension under elevated temperatures >80°C in said reactor tank for deactivating said enzyme; and e) discharge the pre-treated, pre-refined pulp suspension and subjecting it to further mechanical treatment to obtain MFC.

Provided are compositions and processes concerning efficient downstream processing of products derived from organic acids pretreatment of plant materials.

To provide efficient methods and compositions for recovery of products from organic acid pretreatment of plant materials.SOLUTION: The invention is related to compositions and processes concerning (i) recovery of organic acids from a cellulosic pulp derived from organic acid pretreatment of plant materials, (ii) treatment of cellulose recovered from the cellulosic pulp derived from the organic acid pretreatment of the plant materials prior to conversion to glucose, (iii) separating and cleaning lignin from a lignin suspension derived from the organic acid pretreatment of the plant materials, (iv) recovery of organic acids from an aqueous phase of the organic acid pretreatment of the plant materials, (v) recovery of residual organic acids from hemicellulose-containing fractions derived from the organic acid pretreatment of the plant materials, and (vi) an organic fertilizer produced from cellulose and hemicellulosic juice derived from the organic acid pretreatment of the plant materials.SELECTED DRAWING: None