Dry cellulose fibers and the process of making the same

FIELD: chemistry.

SUBSTANCE: dry cellulose fibers contain at least 50 wt % of fibers having a length of up to 350 mcm and a diameter in the range of 100-500 nm, where the fibers do not contain additives, are not derivatized and are redispersible in water. A film of dry cellulose fibers containing the described fibers is shown where the film is water dispersible. Also described is a process for producing a dry film of cellulose fibers, comprising preparing a liquid slurry from the above-described cellulosic fibers obtained by multi-step highly refined wood or plant fibers and retaining more than 90% of the fibers on the forming section of the papermaking machine in which the fibers do not contain additives and are not derivatized. The film can be converted into powders or flakes for transport, storage or subsequent use.

EFFECT: creation of repeatedly water-dispersible fibers of fibrillated cellulose, obtained without the use of chemical additives and derivatization.

23 cl, 3 dwg, 5 tbl, 5 ex

 



 

Same patents:

FIELD: packaging industry.

SUBSTANCE: invention relates to packaging materials and relates to a paper or paperboard substrate, the method of manufacturing the substrate, and the package formed from the substrate. The paper or paperboard substrate has the properties of impermeability and comprises a first layer based on fibres, the second layer comprising from 0.1 to 10 g/m2 of dry microfibrillated cellulose with the microfibrille size of 10 to 100 microns, and the third layer comprising the polymer.

EFFECT: invention provides a package formed of the said substrate, capable of protecting the packed product from external effects, manufactured at low level of carbon dioxide emissions.

13 cl, 1 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: polysaccharide or a polysaccharide derivative is adsorbed on fibres of a suspension cellulose material for at least 1 minute in the presence of monovalent or polyvalent cations, such as aluminium, calcium and/or sodium salts. The obtained fibrous suspension is subjected to mechanical disintegration with obtaining nanofilbrillated cellulose, modified with polysaccharide or the polysaccharide derivative.

EFFECT: invention makes it possible to reduce an amount of energy, spent on defibration, as well as to obtain paper with improved qualities.

23 cl, 6 tbl, 6 dwg, 2 ex

FIELD: process engineering.

SUBSTANCE: proposed method comprises preprocessing of fibre by enzyme in first enzymatic treatment whereat enzyme features activity of 0.01-250.0 ncat/g. Then, fibre is subjected to first mechanical processing and second enzymatic processing whereat enzyme features activity of 50-300 ncat/g. Note here that activity of enzyme during second enzymatic processing exceeds that during first enzymatic processing. Fibre is subjected to second mechanical processing to get microfibrillar cellulose.

EFFECT: perfected process, lower costs.

8 cl

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: process engineering.

SUBSTANCE: invention relates to production of microfibrillar cellulose. Proposed process comprises preliminary processing of fibre accompanied with processing of said fibre with enzyme. Then, fibre is mixed with solution bearing alkaline metal hydroxide. Now, fibre is subjected to mechanical processing to produce microfibrillar cellulose. EFFECT: perfected process, lower energy costs.

EFFECT: 12 cl, 1 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: invention relates to fluff pulp sheets, methods of their manufacturing and application. The method of manufacturing fluff pulp sheet includes a contact of, at least, one cationic trivalent metal or zinc, or their salt, or their combination with a composition, which contains fluff pulp fibres and water with the first value pH<5 in order to form the first mixture. After that, carried out are: contact of, at least, one loosing SAS with the first mixture and increase of pH value to the second value pH≥5 in order to form a fluff pulp mixture. After that, cloth of fluff pulp mixture is formed and dried to produce a fluff pulp sheet. The invention also relates to the fluff pulp sheet, produced by the said method. Also claimed is the fluff pulp sheet, which includes cloth, containing fluff pulp fibres, at least, one cationic trivalent metal, its salt or their combination, at least, one loosing SAS, and has a defibration energy <145 kJ/kg. Also claimed are products and possible applications of the fluff pulp sheet.

EFFECT: obtained sheets and products possess improved physical-mechanical characteristics.

31 cl, 1 dwg, 2 tbl, 2 ex

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 50°C, 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: invention relates to compositions for coating of printing paper, at that the said compositions comprise microfibrillated cellulose (MFC) and one or more polysaccharide hydrocolloids, and the application of the said compositions. In addition, the invention relates to the coated paper comprising a first layer of polysaccharide hydrocolloid(s) and a second layer of MFC, and the use of the said paper.

EFFECT: reduction of garnetting or fuzzing of paper.

20 cl, 13 dwg

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. The composite material is obtained by reacting iron chloride solution with sodium hydroxide in the presence of short fibrillated cellulose fibres to form a dispersion of a product which is thickened by floatation to obtain floatation sludge. The fibrillated cellulose fibres contain, in wt %, at least 94% fibres with thickness of not more than 1.23 mm and at least 54% fibres with length of not more than 0.63 mm, which are present in the liquid medium in amount of 100-300 mg/dm3.

EFFECT: invention enables to obtain a composite material with iron hydroxide particles, coloured in different shades of brown and having bactericidal and ferromagnetic properties.

3 cl, 5 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of porous membrane suitable for use in electrochemical devices such as various storage batteries, capacitors, etc. Porous membrane comprises cellulose fibres including 5 wt % or more of cellulose fibres (per sum of total mass thereof) with diameter of 1 mcm or more and features tensile strength of 50 Nm/g or larger and/or tenacity of 0.40 kN/m or larger.

EFFECT: possibility of use as an electrochemical device separator with low specific IR.

21 cl, 6 ex, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to production of fibres from reproducible stock, particularly, from cellulose and to device to this end. This method consists in mixing said reproducible stock with solvent to get spin dope. Then, solvent is removed, at least partially, from said mix to feed spin dope to spinning device. Spin dope is diluted with solvent before spinning. Proposed device comprises mixing reactor and spin dope spinner and mixer arranged there between to decreased spin dope viscosity.

EFFECT: higher efficiency of propose process.

26 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to production of powdered cellulose from cellulose materials. The method involves breaking down cellulose material using a Lewis acid solution and an organic solvent while stirring. The breakdown process takes place at low concentration of the Lewis acid solution using a minimal amount of organic solvent. The product is washed and dried. The cellulose material used is different types of lignocellulose materials obtained from semi-finished wood products which are obtained during processing thereof at paper mills, straw of grain crops and waste paper material.

EFFECT: obtained powdered cellulose has high chemical reactivity and can be used in analytical chemistry, cosmetic and pharmaceutical industry, to modify cellulose and lignocellulose materials and when producing derivatives thereof for special purposes.

2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: described is a composition for obtaining a binding agent for soaking cellulose fibres. The composition contains polyolefin resin which reacts with 1.6-4.0% maleic anhydride. The composition has less than 1500 ppm free maleic anhydride. The resin has melt flow index at 190°C and 2.16 kg ranging from approximately 0.1 to 500 g/10 min. The composition has yellowing index of 20-70. The polyolefin is polyethylene. Described also is a cellulose composite containing 10-90% cellulose fibre; a first polyolefin resin having melt flow index from 0.1 to 100 g/10 min; 0.1-10 wt % composition for obtaining the binding agent. The maleic anhydride is grafted on the polyethylene.

EFFECT: high binding efficiency of the binder.

12 cl, 8 tbl, 20 ex

FIELD: chemistry.

SUBSTANCE: product contains the following in wt %: 1-50 modified hybrid resin based on natural fatty acids and 99-50 natural material selected from cellulose, wood, wood fibre, flax, hemp, starch and another natural fibre or combinations thereof. The product can contain 20-80 wt % thermoplastic, 30-70 wt % binder or natural adhesive. The hybrid resin is obtained via water-emulsion polymerisation of an acrylate monomer - butylacrylate, methyl methacrylate or butylacrylate, on an alkyde resin based on fatty acids in the presence of a radical initiator at 30-100°C. Fatty acids are selected from tall oil, suberin fatty acids, cutin fatty acids, vegetable oils and mixtures thereof. The composite product is obtained by mixing acrylate hybrid and natural material or combination thereof. Further, the product is moulded and hardened under heat at 120-200°C until a composite product of the given type is obtained.

EFFECT: invention enables to obtain composite plates with improved properties, good biodegradability and low toxicity; such properties of the plates are achieved by using modified hybrid resins in form of a stable aqueous emulsion as binding materials and compatibilisers.

22 cl, 1 tbl, 1 dwg, 9 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a foamed element with a hydrophilic agent formed from cellulose contained in the foam material, where the foamed element containing cellulose is capable of reversibly absorbing moisture, where the cellulose has the structural type of a crystalline modification of cellulose-II, and content of the cellulose from the total weight of the foam material ranges from 0.1 wt %, particularly 5 wt %, to 10 wt %, particularly 8.5 wt %, and content of moisture in the foamed element, starting from the initial moisture value corresponding to equilibrium moisture relative the first external atmosphere with first temperature and moisture conditions with given temperature and relative moisture, increases when used in a second external atmosphere different from the first, with second temperature and moisture conditions with a higher temperature and/or higher relative moisture compared to the first conditions, and moisture absorbed when using cellulose-II contained in the foamed element after using in the second external atmosphere is once more given up to the second atmosphere after a time interval ranging from 1 hour to 16 hours until the initial moisture value, which corresponds to equilibrium relative moisture of the first external atmosphere, is reached again.

EFFECT: obtaining a foamed element with improved moisture regulation.

14 cl, 2 ex, 2 tbl, 3 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to composite products, particularly a composite panel containing hybrid resins based on natural acids, as well as a method of producing a composite product. The product contains the following in wt %: 1-50 modified hybrid resin based on natural fatty acids and 99-50 natural material selected from cellulose, wood, wood fibre, flax, hemp, starch and another natural fibre or combinations thereof. The product can optionally contain 20-80 thermoplastics, 30-70 binder or natural adhesive. The hybrid resin is obtained via condensation of a mixture of natural C12-C20 fatty acids modified with maleic acid or anhydride, and an alkyde resin based on fatty acids of tall oil, suberin fatty acids, cutin fatty acids, plant oil or mixtures thereof. Properties of the panel are achieved using modified hybrid resins in form of a stable aqueous emulsion as binding materials and compatibilisers.

EFFECT: invention enables to obtain composite panels with improved properties, specifically good biodegradability and low toxicity.

17 cl, 1 tbl, 27 ex

Biomass processing // 2432400

FIELD: chemistry.

SUBSTANCE: invention discloses a method of obtaining a product containing inflammable fuel from biomass raw material. The method involves pretreatment of biomass raw material having density less than approximately 0.5 g/cm3 using one or more pretreatment methods. The pretreatment methods are selected from a group comprising irradiation, ultrasonic treatment, pyrolysis and oxidation. Pretreatment via irradiation involves irradiation with an electron beam. The obtained biomass raw material then undergoes conversion using microorganisms to obtain a product containing inflammable fuel.

EFFECT: improved method.

16 cl, 40 dwg, 9 tbl, 20 ex

FIELD: medicine.

SUBSTANCE: what is offered is a method of making a construct containing crystal cellulose. Cellulose-forming organisms are grown at least partially in a hollow template made by means of a three-dimensional printer. What is offered is a method of making the hollow template by means of the three-dimensional printer which grows portions of the hollow template in layers from a modelling material.

EFFECT: invention can be used for making the construct which can be successfully used as an implant or for cultivation of mammal or human living cells.

16 cl, 7 dwg

FIELD: process engineering.

SUBSTANCE: proposed composition comprises fibrous mass, water and, at least, one neutralised complex phosphate ester of the formula R1O[PO(OZ)]OZ, where R1 is alkyl chain containing 2-24 carbon atoms, Z is separate H or alkyl chain containing 1-24 carbon atoms. Proposed composition can comprise wax, starch, lignosulfonate, biocide. Proposed method consists in adding complex phosphate ester into fibrous mass prior to forming and, then, adding excess amine base to neutralise ester.

EFFECT: perfected process.

27 cl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to polyolefin compositions, suitable for the manufacture of various articles. A polyolefin composition, comprising in percent by weight: 1) and 2): 1) 75-85 wt % propylene homopolymer, having the melting point of 150°C or more, 2) 15-25 wt % ethylene copolymer with one or more C4-C10 α-olefins (α-olefin), containing from 20 to 30% of the said C4-C10 α-olefins (α-olefin); the composition is characterised as follows: - MFR value from 5 to 10 g/10 min. at 230°C, 2.16 kg, - total content of ethylene from 10.5 to 20%, - total content of C4-C10 α-olefins (α-olefin) within the range of 3 to 7.5%, - the ratio (XStot/XSm) of the total fraction soluble in xylene at room temperature to the fraction soluble in xylene at room temperature of the matrix component (1) from 5 to 15 and - the value of the intrinsic viscosity of the total fraction soluble in xylene at room temperature (XSIVtot) of 1.5 dl/g or less. Also claimed are: method for the preparation of polyolefin compositions, films, cast films, injection moulded articles.

EFFECT: polyolefin composition based films exhibit heat sealability, retortability, low haze.

6 cl, 2 tbl, 2 ex

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