Method of applying composition containing cationic trivalent metal and loosener and sheet of loose cellulose made therefrom

FIELD: wood working industry.

SUBSTANCE: proposed is a method of making a sheet of loose cellulose involving contacting of at least one cationic trivalent metal, a salt thereof or their combination with a composition containing fibres of loose cellulose and water, at the first pH value to form a mixture of loose cellulose; forming a fabric from this mixture of loose cellulose, application of at least one loosening surfactant onto the fabric and raising the pH value to the second pH value, which is greater than the first pH value, for making a sheet of loose cellulose. Also proposed is a sheet of loose cellulose including the fabric containing fibres of loose cellulose, at least one cationic trivalent metal, its salt or their combination, at least one loosening surfactant and having the energy of separation into fibres of <145 kJ/kg. Also proposed are products and applications of the sheet of loose cellulose.

EFFECT: proposed is a method of making a sheet of loose cellulose.

1 cl

 



 

Same patents:

FIELD: textiles, paper.

SUBSTANCE: present invention relates to a method of manufacturing paper or cardboard, the aqueous composition used in the manufacture of paper and cardboard. The claimed object is solved in that the paper or cardboard mass is diluted with an aqueous composition obtained from particles of colloidal size of carbonate and bicarbonate and other forms of carbonate in aqueous solution, so that the pH value in the aqueous solution is substantially maintained at a level of 6.0-8.3 during formation, and water is removed from the mass by means of draining, pressing and drying. The invention also relates to a method of preparing an aqueous composition used for this purpose.

EFFECT: object of present invention is to improve retention of solid substance, dehydration and texture, especially in the manufacture of paper and cardboard products.

19 cl, 5 tbl

FIELD: chemistry.

SUBSTANCE: loosening surfactant includes one or more linear or branched monoalkylamines, a linear or branched dialkylamine, a linear or branched tertiary alkylamine, an ethoxylated alcohol, a linear or branched, saturated or unsaturated hydrocarbon surfactant, a fatty acid amide, a quaternary ammonium salt of a fatty acid amide, a quaternary ammonium salt of dialkyl dimethyl, a quaternary ammonium salt of dialkyl imidazoline, a quaternary ammonium salt of dialkyl ether, triethanolamine-di-tall oil fatty acid, fatty acid dialkylamide, C16-C18 unsaturated alkyl alcohol ethoxylate, a compound having registration number CAS 68155-01-1, a compound having registration number CAS 26316-40-5, or a combination thereof.

EFFECT: disclosed is a method of producing a sheet of loose cellulose, which includes forming a cloth containing loose cellulose fibres and depositing at least one loosening surfactant onto the cloth to obtain a sheet of loose cellulose.

27 cl, 1 dwg, 1 tbl

FIELD: medicine, pharmaceutics.

SUBSTANCE: invention relates to nano-fibrillar cellulose gels, intended for wide application in industry and in wound healing. A method of their production includes (a) preparation of cellulose fibres; (b) preparation of at least one filler and/or pigment; (c) combination of the cellulose fibres and the filler and/or pigment; (d) fibrillation of the cellulose fibres in the presence of at least one filler and/or pigment to formation of gel from primary fibrils, the filler and/or pigment are selected from the group, including precipitated calcium carbonate, natural crushed calcium carbonate, dolomite, talc, bentonite, clay, magnesite, satin white, sepiolite, huntite, diatomite, silicates and their mixtures. A nano-fibrillar cellulose gel, obtained by the method described above and its application are also described.

EFFECT: invention provides the increased productivity of nano-fibrillar cellulose gels with energy efficiency of production.

16 cl, 8 dwg, 2 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing microfibrillated cellulose. The method of producing microfibrillated cellulose includes: providing a suspension containing cellulose fibres; treating the suspension with an enzyme; mechanically treating the suspension to break down the fibres, wherein mechanical treatment and enzyme treatment is carried out simultaneously in a single treatment step, said treatment step ranging from 15 minutes to 25 hours.

EFFECT: obtaining microfibrillated cellulose using an improved method which is efficient in terms of power saving.

7 cl, 2 dwg,1 ex

FIELD: chemistry.

SUBSTANCE: method of obtaining monocrystalline cellulose includes cellulose destruction, washing the product with water and bases, drying. A cellulose-containing material is processed with solutions of heteropolyacids in water, solutions of heteropolyacids in lower aliphatic carboxylic acids or in water mixtures of carboxylic acids with any ratios water-carboxylic acid without an addition of mineral acids at a temperature of 100-120C for 15-120 minutes with the concentration of heteropolyacids of 0.1-15 mol.%.

EFFECT: invention makes it possible to simplify and reduce the process duration, increase efficiency, manufacturability and ecological compatibility of the MCC manufacturing.

FIELD: chemistry.

SUBSTANCE: method for cellulose delignification and bleaching with chlorine dioxide and hydrogen peroxide in the presence of molybdate or tungstate as a catalyst. The bleaching step includes: a) a first step where cellulose (3-30 wt %) in an aqueous mixture at temperature in the range of 50 to 150C and pH in the range of 2 to 7 reacts with chlorine dioxide in an amount which corresponds to a Kappa coefficient in the range of 0.02 to 0.25 until more than 90% chlorine dioxide is converted; b) a second step where the mixture obtained at the first step, without separating components thereof, reacts at temperature in the range of 50 to 150C with hydrogen peroxide which is taken in amount of 0.1 to 5 wt %, in the presence of molybdate in an amount which corresponds to molybdenum content of 10 to 2000 ppm, or in the presence of tungstate in an amount which corresponds to tungsten content of 200 to 10000 ppm. All amounts in each case are given with respect to the mass of the dry cellulose used.

EFFECT: improved whiteness of cellulose, low consumption of chlorine dioxide without undesirable destruction of cellulose, high resistance of cellulose to yellowing.

10 cl, 10 tbl

FIELD: chemistry.

SUBSTANCE: claimed invention relates to method of obtaining nanocellulose, which includes modification of cellulose fibres. method includes the following stages: i) processing cellulose fibres for, at least, five minutes with aqueous electrolyte-containing solution of amphoteric or anionic carboxymethylcellulose (CMC), where the temperature in the process of processing constitutes at least 50C, and at least one of the following conditions is fulfilled: A) pH value of aqueous solution in the process of processing is in the interval about 1.5-4.5; or B) pH value of aqueous solution in the process of processing is higher than about 11; or C) concentration of electrolyte in aqueous solution is in the interval about 0.0001-0.5 M, if electrolyte has monovalent cations, or in the interval about 0.0001-0.1 M, if electrolyte has bivalent cations, ii) setting pH in the interval of pH values from about 5 to about 13 by application of basic and/or acidic liquid and iii) processing said material in mechanical crushing device and obtaining nanocellulose in such way. If amphoteric CMC is applied, at least 23.6 mg/g of CMC are added, and in case anionic CMC is applied, at least 61.6 mg/g of CMC are added.

EFFECT: application of method of nanocellulose production in accordance with claimed invention prevents clogging of mechanical devices.

13 cl, 7 dwg, 1 ex, 1 tbl

FIELD: textiles, paper.

SUBSTANCE: method is carried out by successive soaking of cellulose raw material in alkaline solution thermo-mechanical chemical processing, extraction, washing, bleaching, extraction, washing, extraction and drying, and herbaceous plants are taken as the cellulose raw material. Before drying the cellulose raw material is loosened to individual fibres, transported on screws in which the diffusion alignment is carried out on moisture by volume, followed by drying in a microwave unit.

EFFECT: invention enables to reduce energy costs and to obtain cellulose which is uniform on quality characteristics.

10 cl, 3 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: raw material undergoes steam treatment before the cooking step. Cellulose obtained by cooking, undergoes cold caustic extraction (CCE) during subsequent treatment.

EFFECT: invention enables to obtain cellulose with high output and purity of the product, and avoid accumulation of hemicellulose in the bleaching filtrate.

21 cl, 7 ex, 9 tbl, 13 dwg

FIELD: chemistry.

SUBSTANCE: method of obtaining alkaline cellulose involves a step for providing a cellulose mass, which contains cellulose fibres with free space between fibres, and treating said cellulose mass with an alkali to obtain alkaline cellulose. Alkaline treatment takes place in the presence of an expander which is capable of penetrating the space between cellulose fibres. The expander is a hydrophilic polymer which can be dissolved or dispersed in aqueous solution.

EFFECT: high reaction capacity of cellulose mass.

12 cl

FIELD: cellulose production.

SUBSTANCE: invention relates to manufacture of cellulose from cotton lint after alkali pulping or from prehydrolyzed wood cellulose and can be utilized in paper-and-pulp industry or in manufacture of artificial fibers, films, and other cellulose materials. Pulped cotton lint or prehydrolyzed wood cellulose is bleached by sodium hypochlorite at modulus 1:20 to 1:30 and 20-30°C, washed, treated for 50-60 min with 1.0-1.5% sodium hydroxide solution at 80-90°C, and subjected to souring, after which desired product is recovered. More specifically, cotton lint after alkali pulping is bleached in two steps separated by washing. In the first step, bleaching is carried out for 0.5-2.0 h at active chlorine concentration 0.3-2.0 g/L and, in the seconds step, for 0.5-6.0 h with 1.0-6.0 g/L active chlorine concentration. Prehydrolyzed wood cellulose is leached in one step for 0.5-6.0 h with 0.3-6.0 g/L active chlorine concentration.

EFFECT: improved quality of product, reduced average degree of polymerization, and increased reactivity thereof.

2 tbl, 18 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: pulp for manufacturing lyocell fiber comprises processed alkali cellulose paste containing hemicellulose in amount at least 7% and cellulose having median degree of polymerization between about 200 and about 1100, copper number about 2.0,w herein more than 4% of pulp fibers have length-weighted average fiber length below 2.0 mm. Lyocell fiber comprises above-defined hemicellulose. Process for preparing composition to be converted into Lyocell fiber comprises boiling in boiler to produce alkali pulp wherein feed contains sawdust in amount between 0 and 100% and contacting alkali pulp containing cellulose and at least about 7% of hemicellulose, under alkaline conditions, with oxidant in amounts high enough to lower average cellulose polymerization degree from about 200 to about 1100 without decrease in content of hemicellulose in pulp to below about 50% or significant increase of copper number to above about 100%.

EFFECT: enabled preparation of rapidly dissolving compositions.

80 cl, 6 dwg, 2 tbl, 3 ex

FIELD: artificial fibers.

SUBSTANCE: process comprises treating fibers at least partially cleaned with the aid of biocyde-effective amount of biocyde composition selected from group consisting of didecyldimethylammonium chloride, didecyldimethylammonium bromide, water-soluble copper salts, and mixtures thereof. When dried, fiber exhibits improved biostability and can be improved (refined) without considerable consumption of power and without considerable loss in fiber length and formation of small pieces. Fiber can be employed in manufacture of fibrolite slabs, panels, and the like.

EFFECT: increased biological stability.

5 cl, 6 tbl, 3 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: invention relates to processing of industrial-grade wood cellulose involving hydrothermal processing of wood followed by (i) bleaching including any combination of treatment with oxygen, chlorine, sodium hydroxide, chlorine dioxide, hydrogen hydroxide, ozone, and/or sodium hypochlorite; (ii) reducing degree of polymerization by chemical means; and (iii) exposing resulting material to fixed dose of in-line electron emission within a range of 1.5 to 25 kGr so that variability in cellulose viscosity is limited by 0.2 and 1 cps values.

EFFECT: enhanced processing efficiency.

8 cl, 6 dwg, 4 ex

FIELD: textile fabrics; paper.

SUBSTANCE: flushing tape contains fabric that has multi-layer texture and is weaved with texture structure of high density. Specified fabric is made of one or several materials selected from the group that consists of the following components: polyphenylene sulfide, polyetheretherketone and KEVLAR®. Method of flushing tape manufacture contains stage of weaving of multi-layer fabric with texture structure of high density.

EFFECT: fabric provides larger support for fiber due to high density of base of free passage of base thread at simultaneous provision of high dehydration to pressurization due to increased volume of cavities.

45 cl, 14 dwg

FIELD: textiles, paper.

SUBSTANCE: method refers to cellulose washing method and can be used in pulp and paper industry to obtain sulfite cellulose when producing paper and cardboard and chemical processing. Cellulose is rinsed with cold water in the presence of organic additive agent SAA of weakly anionic type - compound UMS-1. The present additive is water-based mixture of biodegradable ethoxylated fatty alcohols and non-chlorinated solvents. Additive consumption makes 0.005-0.02% of completely dry pulp weight.

EFFECT: enhancement of cellulose washing efficiency and pulldown of common and hazardous resin content in cellulose.

3 tbl, 15 ex

FIELD: chemistry.

SUBSTANCE: method of preparing mercerised fibre involves treatment of cellulose fibre with a mercerising agent with large concentration of dissolved hemicellulose accumulated after continuous recycling of alkaline solutions or through addition of soluble carbohydrates, with concentration of alkali of approximately 5-15% of the total weight of the mixture. Temperature and period of time must be sufficient for preparation of mercerised cellulose fibres which form fibre fabric having air porosity equal to or greater than approximately 100 cubic feet in a minute per square foot, determined using the TAPPI T251 cm-85 at pressure of 125 Pa on hand moulding sheets 60 gcm.

EFFECT: high porosity of material.

8 cl, 4 dwg, 2 tbl, 3 ex

FIELD: paper industry.

SUBSTANCE: method includes treatment of wood chips by acid solution in process of extraction by steam, liquid containing water or their combination to remove hemicellulose. In one version prior to treatment or in process of treatment peroxide is used, and sulfate boiling is carried out until hemicelluloses content in modified sulfate cellulose becomes from more than 5 to approximately 9%. In another version after extraction of wood chips chemical or semi-chemical boiling is carried out until content of hemicelluloses becomes from 3 to 15% with further washing and bleaching. In the third version after chemical and semi-chemical boiling until content of hemicelluloses becomes approximately from 3 to 15%, bleaching is carried out.

EFFECT: improved brightness and volume with better dehydration of cellulose, fineness of grinding and efficiency.

11 cl, 3 dwg, 5 tbl, 4 ex

FIELD: paper industry.

SUBSTANCE: cellulose mass produced from lignocellulose material, method for boiling of lignocellulose material and method of its softening may be used in pulp and paper industry to produce paper, cardboard, fibre board and similar industrial products. Cellulose mass is produced from lignocellulose material exposed to mixing in aqueous solution of tetraalkylammonium salt under action of microwave radiation. Method for boiling of lignocellulose material and method of its softening repeat above-mentioned method for production of cellulose mass. Treated lignocellulose material is preferably hard or soft wood.

EFFECT: production of new cellulose material, reduced consumption of energy and improvement of environment.

18 cl, 11 ex

FIELD: textile, paper.

SUBSTANCE: method is carried out by means of subsequent soaking of cellulose-containing herbal raw materials in alkaline solution, thermomechanical treatment, squeezing, washing, bleaching, squeezing, washing, squeezing and drying, besides, squeezing and washing are done in pulsating centrifuge.

EFFECT: higher yield of cellulose, reduced norms of consumption of initial reagents and water and reduced power inputs.

1 tbl, 3 ex

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