369results about "Cellulose pulp after-treatment modification" patented technology

The invention relates to a method for manufacturing SCK paper having a basis weight in the range of 50 to 100 g / m2, wherein an optimal combination of nonrecycled BCP, BCTMP and recycled pulp obtained from release liner supercalendered Kraft paper is used to adjust the properties of the fiber furnish. While the use of BCTMP enables a product having a higher bulk, the recycled pulp component, which has high compatibility with the paper manufacturing process, enables to balance the manufacturing process and reduce the dimensional changes and shrinkage of the formed SCK paper. The combined presence of the BCTMP and the recycled pulp component in the fiber furnish improves the water removal from the fibers during the SCK paper manufacturing, while the presence of non-recycled BCP produced from softwood improves the formation and runnability of the paper web on the paper machine. This enables to produce SCK paper with improved sustainability, wherein the density may be controlled by means of the fiber furnish, without downgauging and without adverse effects to other paper properties, which would prevent the use of the SCK paper as substrate layer in a release liner.

The invention discloses a high-toughness carton and a preparation method thereof, and relates to the technical field of papermaking and environment-friendly packaging materials. The carton is made of a high-toughness composite corrugated board, and raw materials of the carton comprise main material pulp fibers, cross-linked modified nanocellulose, a modified starch adhesive, a wet strength agent and a rheology modifier. The cross-linked modified nano-crystalline cellulose is nano-crystalline cellulose of which the surface is grafted with a hyperbranched supramolecular cross-linking agent. According to the method, by preparing the nanocellulose with the surface grafted with the hyperbranched cross-linking agent, a mechanism capable of dissipating energy is constructed in a fiber network, and compared with the prior art, the defect that regenerated fibers are large in brittleness can be effectively overcome, and the dynamic impact toughness of the carton is remarkably improved. By using the modified starch adhesive disclosed by the invention, an adhesive layer has better ductility and interlayer binding force, and when a paperboard is stressed and deformed, the adhesive layer can be deformed along with the deformation and is not easy to break, so that the stability of interlayer binding is favorably kept.

The invention discloses a preparation method of all-bamboo fiber basic color paper cup body paper and a product thereof, and the preparation method comprises the following steps: mechanically grinding bamboo chemical pulp fibers and bamboo chemical thermo-mechanical pulp fibers as raw materials, carrying out biological treatment on the bamboo chemical thermo-mechanical pulp fibers by using laccase / mediator, and preparing the paper cup body paper by adopting a three-layer composite papermaking process. The paper cup body paper is composed of a surface layer (bamboo chemical pulp), a core layer (bamboo chemical thermo-mechanical pulp treated by laccase / ABTS) and a bottom layer (bamboo chemical pulp), and aluminum sulfate, rosin size and CPAM are added in the papermaking process. The technical problems that the production cost is high due to the fact that traditional unbleached paper cup body paper depends on wood pulp, and bamboo pulp fibers are difficult to give consideration to high bulkness and high strength are solved, the raw material cost is low, the production process is environmentally friendly, the product has excellent physical strength, bulkness and water resistance, wood resource consumption can be reduced, and sustainable development of the papermaking industry is promoted.

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.

The present invention generally relates to methods and compositions for manufacture of tissue, paper, or board and for enhancing retention and drainage thereof. In particular, the disclosure provides methods for enhancing retention and drainage by addition of a retention and drainage aid comprising quick inversion cationic emulsion polyacrylamides (QIC-EPAMS) and polyvinylamine (PVAm) polymers Preparation of paper sheets under these conditions provides improved retention, gravimetric drainage rates, and DDA drainage time, without over-flocculation and allowed for significant decrease in PVAm dosage.

The present invention provides a pulp sheet for producing fluff pulp that has excellent deodorizing properties, good crushability, and easily recovers its bulk after compression. [Solution] A pulp sheet for producing fluff pulp is prepared by blending (A) softener kraft pulp, (B) metal ion-containing cellulose fibers having ionic substituents and containing ions of one or more metal elements selected from Ag, Au, Pt, Pd, Ni, Mn, Fe, Ti, Al, Zn, or Cu, and (C) softener, such that (C) is 0.1 to 50 parts by mass per 100 parts by mass of the total of (A) and (B).

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.

To provide a sheet including a fine fibrous cellulose, whose yellow discoloration during heating is reduced.SOLUTION: The invention relates to a liquid composition including a fibrous cellulose whose fiber width is 1000 nm or less, a resin and a reductant. The invention also relates to a sheet including a fibrous cellulose whose fiber width is 1000 nm or less, a resin and a reductant.SELECTED DRAWING: None

The present invention generally relates to methods and compositions for making tissue, paper or paperboard and for enhancing their retention and drainage. In particular, the present disclosure provides a method for enhancing retention and draining by adding a retention and drainage aid comprising a fast reversed phase cationic emulsion polyacrylamide (QIC-EPAM) and a polyvinylamine (PVAm) polymer. Manufacture of paper under these conditions provides improved retention, gravity drain rate, and DDA drain time without excessive flocculation, and allows for a significant reduction in PVAm dosage.

The present invention relates to A method for manufacturing a paper or paperboard based packaging laminate, said method comprising: a) providing a paper or paperboard substrate having a grammage of at least 80 g / m2, a density below 800 kg / m3, and a bending resistance in the machine direction as measured according to ISO 2493 (L&W, 15°) above 80 mN, b) providing a transfer coating substrate comprising a vacuum coating layer and a backing layer separated by a release layer, and c) transferring the vacuum coating layer from the backing layer to the paper or paperboard substrate by a transfer coating process using an adhesive layer applied on the paper or paperboard substrate and / or the vacuum coating layer to obtain a paper or paperboard based packaging laminate.

The invention relates to absorbent paper as well as a preparation method and application thereof. The method comprises the following steps: pulping plant fiber pulp, adding sodium bicarbonate for pretreatment, and washing to obtain pretreated paper pulp; adding a dispersing agent, a wet strength agent and a composite antibacterial component into the pretreated paper pulp, and uniformly mixing to obtain mixed paper pulp; the composite antibacterial component is prepared from chitosan, polylysine and a modified copper oxide dispersion liquid; feeding the mixed paper pulp into a rotary screen paper machine to produce upper-layer single-layer wrinkling base paper, then compounding the upper-layer single-layer wrinkling base paper with lower-layer single-layer semi-forming base paper on which the macromolecular water-absorbent resin particles are scattered, and then drying to obtain the water-absorbent paper. The antibacterial rate of the absorbent paper on various pathogenic bacteria is larger than or equal to 99.5%, the antibacterial rate is still larger than or equal to 97% after 20 times of water washing, and the absorbent paper is high in water absorption speed, stable in physical performance, safe, environmentally friendly, controllable in cost, capable of being widely applied to the fields of hygienic products, medical dressings, food packaging and the like, simple in preparation process and suitable for industrial production.

The purpose of the present invention is to provide a laminate having excellent laser cutting machinability and less susceptible to adhesion of waste such as dust. This laminate has: a microfibrous cellulose-containing layer containing microfibrous cellulose having a fiber width of 1-1000 nm (inclusive); and a cationic layer containing a cationic compound on at least one surface of the microfibrous cellulose-containing layer.

The invention relates to the technical field of cigarette packaging materials, in particular to environment-friendly lining paper and a preparation method thereof. The problem that the environment-friendly lining paper is insufficient in tensile strength and barrier property is solved. Paper pulp fibers are compounded with nano fibrillated cellulose and homogenized under high pressure, cationized lignosulfonate and nano montmorillonite slurry are compounded in homogenized slurry, glyoxal is used for in-situ crosslinking, and an internal'brick-mud 'bionic barrier structure is constructed; after the paper sheet is formed, the surface of the paper sheet is coated with an acetylation modified hemicellulose blocking agent, thermocuring is carried out, a gradient structure is constructed cooperatively, the tensile strength, the water vapor blocking property and the aroma blocking property of the lining paper are improved, and the used raw materials are derived from biomass and natural minerals and are green and environment-friendly.

The application discloses a preparation method of nanofibrillated cellulose-based filter material, and steps are as follows: taking bleached coniferous wood pulp as raw material, carrying out pretreatment through biological enzymolysis and mechanical refining, and preparing nanofibrillated cellulose suspension by using a microjet high-pressure homogenizer; mixing the nanofibrillated cellulose suspension with plant fiber pulp according to an absolute dry mass ratio of 1:9-5:5, and forming a gradient pore structure base paper through a double-layer or multi-layer inclined screen paper machine; preparing modified styrene-acrylic emulsion by using a pre-emulsified semi-continuous emulsion polymerization method with acrylic acid, butyl acrylate and styrene as basic monomers and with functional monomers; impregnating and sizing the base paper, controlling the sizing amount to be 5-20 g / m 2 , and obtaining the filter material after drying and solidification. The application has stable and controllable process, and the obtained product has high strength, high filtration precision, good air permeability and water resistance, and can be completely biodegraded, so that the product is environment-friendly and efficient.

The invention belongs to the technical field of thermal interface materials, and particularly relates to a boron nitride-based flexible heat-conducting composite film and a preparation method and application thereof.The preparation method comprises the following steps that h-BN powder and water are mixed and subjected to ball milling, centrifugation is conducted after ball milling, supernate is taken, and BNNS dispersion liquid is obtained; carrying out differential centrifugation on the obtained BNNS dispersion liquid to obtain large-sheet-diameter BNNS, and carrying out uniform ultrasonic dispersion on the large-sheet-diameter BNNS in a differential alcohol organic solvent to obtain large-sheet-layer BNNS organic dispersion liquid; the preparation method comprises the following steps: performing oxidation modification on cellulose nanofibers by adopting a TEMPO oxidation method, and uniformly dispersing the oxidized and modified cellulose nanofibers in water to obtain an aqueous dispersion of the oxidized and modified CNF; the preparation method comprises the following steps: mixing an organic dispersion liquid of large-lamellar BNNS with an aqueous dispersion liquid of oxidation modified CNF, firstly stirring, and then carrying out ultrasonic mixing to obtain a BNNS / CNF composite dispersion liquid; and carrying out suction filtration on the BNNS / CNF composite dispersion liquid to obtain a wet film, and drying and tabletting the wet film to obtain the boron nitride-based flexible heat-conducting composite film. The preparation method is suitable for continuous and large-scale preparation of the high-performance boron nitride-based composite heat-conducting film.

[Problem] Provided are: a method for producing a regenerated cellulose-derived cellulose dispersion or a regenerated cellulose-derived cellulose molded body capable of suppressing swelling in alkali and deterioration of whiteness over time; regenerated cellulose-derived cellulose beads; and a cosmetic material. [Solution] This method comprises: a pulverization step in which a regenerated cellulose is used as a dispersion raw material and the dispersion raw material is pulverized; a depolymerization step in which sodium hypochlorite is added to the pulverized raw material obtained in the pulverization step to reduce a degree of polymerization of the pulverized raw material; a pH adjustment step in which a pH-adjusted cellulose is obtained through a first pH adjustment operation for adjusting the pH of the depolymerized cellulose obtained in the depolymerization step to an alkaline pH of at least 9, a second pH adjustment operation for adjusting the pH of the depolymerized cellulose to an acidic pH of at most 6, and a neutralization operation for neutralizing the depolymerized cellulose; a washing step in which the pH-adjusted cellulose is washed; and a micronization step in which the pH-adjusted cellulose after the washing step is micronized to obtain a cellulose dispersion.

The invention discloses a degradable carton containing modified plant fibers and a preparation method of the degradable carton, and relates to the technical field of carton production. According to the degradable carton containing the modified plant fiber, the degradable carton is formed by splicing corrugated boards, and the corrugated boards are prepared from, by mass, 45-60 parts of the modified plant fiber, 25-35 parts of paper pulp, 5-10 parts of a biodegradable adhesive, 5-15 parts of filler, 1-5 parts of a reinforcing agent, 0.5-3 parts of a waterproof agent and 90-110 parts of deionized water. Through synergistic modification of alkali treatment and an exclusive interface coupling agent, hydrophilic hydroxyl groups on the surfaces of the natural plant fibers are effectively hydrophobized, and the interface compatibility and dispersion uniformity between the fibers and a paper pulp matrix are remarkably improved, so that the overall compressive strength and structural stability of the carton are greatly improved; the problem that the mechanical property is reduced due to direct use of natural plant fibers is solved.

The invention relates to an aroma-carrying multifunctional paper-based material and application thereof, and the aroma-carrying multifunctional paper-based material is prepared by a method comprising the following steps: reacting a carboxylic acid aroma substance with a chlorination reagent to prepare an acyl chloride derivative; the carboxylic acid flavor substance is p-methoxycinnamic acid or a combination of cinnamic acid and p-methoxycinnamic acid; mixing the obtained acyl chloride derivative with plant pulp and a catalyst, and carrying out esterification reaction to obtain carboxylic acid flavor substance grafted plant pulp; and making paper by taking the obtained carboxylic acid aroma substance grafted plant pulp as a raw material to obtain the aroma-carrying paper-based material. Specific carboxylic acid flavor substances are firmly connected to a plant fiber skeleton in a covalent bonding manner, so that long-acting slow release of fragrance can be realized, and the problems of easiness in volatilization, short fragrance retention time and the like in a traditional physical adding manner are effectively solved; meanwhile, the physical characteristics and combustion characteristics of the paper-based material prepared from the chemically modified cellulose are also optimized and improved, so that an idea is provided for developing a novel functional paper-based material.

The present invention relates to a method for manufacturing a laminate (8) comprising a paper substrate and a microfibrillated cellulose (MFC) layer. An MFC suspension containing 50 to 100% by weight of MFC is provided. A wet MFC layer (1) is formed by casting the suspension onto a metal belt support (2), and the dry content of the formed wet MFC layer (1) is 1 to 40% by weight. A paper substrate having a Gurley-Hill air permeability of less than 10,000 s / 100 ml is provided and joined to the wet MFC layer (1) positioned on the metal belt support (2) to form a laminate structure (6). The laminate structure (6) positioned on the metal belt support (2) is dewatered to form the laminate (8). The dewatering includes at least one drying step including drying by at least one non-contact drying device (7), and the metal belt support (2) is heated during at least one drying step. The present invention also relates to the laminate (8) and a packaging material comprising the laminate (8).

The invention relates to the technical field of functional paper-based materials, in particular to a paper-based antistatic diaphragm and a preparation method thereof. The method comprises the following steps: 1) carrying out enzymolysis modification on coniferous wood pulp to prepare cellulose pulp; (2) carrying out in-situ polymerization-wet-process papermaking forming on the cellulose paper pulp to obtain a paper base material; and 3) coating the single surface of the paper base material with the carbon-based slurry, and calendering to obtain the paper-based antistatic diaphragm. The diaphragm has good anti-static performance and mechanical performance, can be effectively used for packaging products with anti-static requirements such as drugs, electronic components and precision components, and has potential possibility of being used as a special electrochemical system diaphragm due to higher ionic conductivity generated by synergy on the basis.

The present invention relates to a packaging material in the form of a laminate comprising a paper or paperboard substrate and a barrier film. The barrier film is based on microfibrillated cellulose. The laminate comprises a paper or paperboard substrate in contact with a first adhesive layer, which is in contact with a second adhesive layer, which is in contact with the barrier film. The present invention also relates to a method for producing such a laminate.

The present invention provides an aqueous dispersion composition which contains microfibrillated cellulose fibers having an average fiber diameter of 500 nm or more, and which is characterized in that if this aqueous dispersion composition is adjusted so as to have a solid content concentration of 1% by mass, and is uniformly spread over a horizontal surface and dried thereon, thereby being formed into a sheet, and the intensity XFe derived from iron atoms and the intensity XK derived from potassium atoms are determined by X-ray fluorescence analysis of the thus-obtained sheet, the relational expression XFe / XK ≤ 150 is satisfied.

The invention discloses application of a rice cell wall CytoUGE gene in preparation of self-assembled large-size cellulose nanocrystals, and belongs to the field of plant genetic engineering and nano materials. The nucleotide sequence of the rice cell wall CytoUGE gene is as shown in SEQ ID NO. 3. Research finds that the rice cell wall CytoUGE gene can regulate and control plant cell wall polysaccharide metabolism key enzyme through heredity, direct regulation and control of the size and the crystallinity of the cellulose nanocrystal are achieved, and the cellulose nanocrystal obtained through rice stems over-expressing the rice cell wall CytoUGE gene is large in size and high in crystallinity; and a better reinforcing effect is achieved in the nano composite material. The invention provides a new technical approach and gene resources for high-valued utilization of plant biomass, and has dual application values and wide application prospects in variety breeding and functional material development.

The present invention relates to a method for producing partially acetylated cellulose nanofibres, CNF, which have a low re-agglomeration tendency and can be used as a reinforcing agent for thermoplastic and thermosetting resins. The method comprises the steps of fibre processing, acetylation and washing. This is a simple and low-cost method that does not require the use of a catalyst or acetic anhydride as a reagent.

The present invention is directed to a film or coating comprising a fiber material, wherein at least 60% by weight of said fiber material is microfibrillated cellulose, said film or coating also comprising at least 1% by weight of extractives from wood bark or cork wood. The invention is also directed to products, such as packaging materials, using or incorporating said film or coating. Such packaging materials are for example laminates or multi-layer structures. The films or coatings according to the present invention having advantageous barrier properties and are therefore particularly suitable for sensitive objects that need to be packaged in a controlled or modified atmosphere. The present invention is also directed to a composition comprising a fiber material, wherein at least 60% by weight of said fiber material is microfibrillated cellulose, said composition also comprising at least 1% by weight of extractives from wood bark or cork wood. The composition is useful for example in the preparation of the film or coating.

A method for forming a filament comprising cross-linked fibers, the method comprising: providing an aqueous suspension comprising at least natural unmodified microfibrillated cellulose (MFC) fibers and a dichlorotriazine-based cross-linking agent as a cross-linking agent; and drying the aqueous suspension to form at least one filament, wherein the filament comprises at least 50% by weight, preferably at least 70% by weight, of MFC.