Composition for manufacturing heat-sensitive paper

FIELD: chemistry.

SUBSTANCE: composition for manufacturing heat-sensitive paper contains a fibrous mixture of 60-80 wt % of cellulose and 20-40 wt % of a chemical-thermomechanical mass obtained by grinding the hardwood chips in two stages. Chemical processing of wood chips before the first stage of grinding is carried out in the presence of deresinator containing anionic, nonionic, cationic, and amphoteric surfactants and isopropyl alcohol with 0.10-0.15 wt % of the absolutely dry wood chips. Before the second stage of grinding, a chemical treatment is carried out in the presence of a deresinator containing anionic, nonionic, and amphoteric surfactants, as well as salts from the group consisting of phosphates, carbonates, silicates, and chelates at a rate of 0.05-0.09% of the absolutely dry wood chips.

EFFECT: replacement of a part of expensive cellulose with a modified bleached chemico-thermomechanical mass from hardwood is provided without loss of mechanical strength of paper.

2 cl, 1 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: chemical and pulp-and-paper industry.

SUBSTANCE: aqueous suspension of at least one filler or mineral contains natural carbonate, polymeric dispersing agent as stabilizer of suspension viscosity, product of natural carbonate treatment with gaseous CO2, and product of natural carbonate reaction with at least one medium or strong H3O+-donors, has pH more than 7.5 at 200C. As natural carbonate suspension contains calcium carbonate (e.g., marble, calcite, carbonate-containing dolomite, chalk, ore mixtures thereof with talcum, and/or TiO2, MgO, or other minerals inert to H3O+-donors). As H3O+-donors suspension contains H2SO3, HSO

-4
, H3PO4, oxalic acid or mixtures thereof in molar ratio to carbonate of 0.1-2. Used carbon dioxide under pressure of 0.05-5 bar may be added from outside, recycled or obtained by continuous H3O+-donors addition. Treatment with H3O+-donors and gaseous CO2 may be carriedout simultaneously or separately, wherein in the last case temperature and time of respective stages are 5-900C and 1-5 h. Claimed suspension is dried to obtain colorant. Colorant has BET specific surface of 5-200 m2/g according to ISO 9277 and mean grain size measured by sedimentation method of 0.1-50 mum. Colorants are used in compositions, as agent for paper lamination, for paper pulp filling, coloration, and board production. Obtained paper is useful in numeric and ink-jet printing.

EFFECT: paper with decreased mass at constant surface.

33 cl, 1 dwg, 2 tbl, 8 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: corn stems are reduced to fragment, boiled, ground, dispersed, flattened, and dried to produce paper sheets. Boiling is carried out for 1.5-4 h at ratio of aqueous solution of reagent to corn stem material between 3:1 and 6:1 and temperature 120-200°C.

EFFECT: achieved high quality of pulp, improved environmental condition, and reduced expenses.

5 cl, 2 tbl, 7 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: pulp for manufacturing mainly box-destination cardboard contains sulfite cellulose, wood-pulp, and secondary fiber. Sulfite cellulose is, more particularly, bisulfite cellulose bleached to 84-86% and having rigidity 30-35 Kappa units, tear resistance 430-460 mN, and punching resistance 430-460 mN. Such bisulfite cellulose is obtained by pulping mixture of softwood and foliferous wood at pH of cooking liquor 1.6-2.3, SO2 concentration 6.0-6.5%, and temperature 145-152°C. Wood-pulp is the one subjected to chemical, thermal, and mechanical treatment and characterized by whiteness 72-75%. Secondary fiber is ground paper waste with specified degree of grinding, optionally in the form of blend of differently ground marks.

EFFECT: improved strength characteristics and reduced manufacturing expenses.

4 cl, 1 tbl, 4 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: pulp for manufacturing mainly packaging cardboard contains sulfite cellulose, wood-pulp, and secondary fiber. Sulfite cellulose is, more particularly, bisulfite cellulose having rigidity 40-50 Kappa units, tear resistance 390-450 mN, and punching resistance 580-620 mN. Such bisulfite cellulose is obtained by pulping softwood at pH of cooking liquor 2.4-2.9, SO2 concentration 5.0-5.5%, and temperature 155-157°C. Wood-pulp is the one subjected to chemical, thermal, and mechanical treatment and characterized by whiteness 60-65%. Secondary fiber is ground paper waste with specified degree of grinding, optionally in the form of blend of differently ground marks.

EFFECT: improved strength characteristics and reduced manufacturing expenses.

4 cl, 1 tbl, 4 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: invention relates to production of pulps used in binder-based articles. Method of invention comprises repetitive soaking and washing of unbleached pulp in water, which is maintained in alkaline state at elevated temperature to obtain cellulose product characterized by chemical oxygen demand not above 2.0 kg per 10 kg dry cellulose.

EFFECT: improved strength characteristics of products.

14 cl, 1 dwg, 2 ex

FIELD: fungicides.

SUBSTANCE: invention proposes use of strobilurines as fungicidal agents designed to be applied in the form of dispersions in industrial process water and in the form of pulp both used in paper industry. Application areas include preservation of wet sheet, protection against mildew, in particular protection of paper products, or other areas wherein fungicidal or mildew-controlling agents are required. Water systems, which can be treated with strobilurines include papermaking machine systems, fibrous intermediate and paper systems, cooling towers, and heat-exchangers.

EFFECT: increased availability, reduced toxicity, and avoided involvement of volatile and inflammable organic solvents.

38 cl, 2 tbl, 4 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: invention relates to unbleached pulps, which are used in binder-based cellulose products, which are kraft pulp products. Cellulose product is maintained under alkali conditions during washing operation since initial soaking phase to cellulose drying step and exhibits chemical oxygen demand not higher than 2.0 kg per 1000 kg dry cellulose.

EFFECT: increased strength characteristics of product.

11 cl, 1 dwg, 2 ex

FIELD: polymer materials and papermaking industry.

SUBSTANCE: invention relates to aqueous silicon-containing composition containing anionic organic polymer comprising at least one aromatic group and silica-based anionic particles in aggregated form or microgel form. Anionic organic polymer, in particular, contains at least one aromatic group and silica-based anionic particles in amount at least 0.01% of the total mass of composition. Composition contains essentially no sizing substance capable of reacting with cellulose, whereas anionic organic polymer containing at least one aromatic group is not naphthalenesulfonate-formaldehyde condensate. Invention also relates to methods for preparing the composition and to utilization thereof as a substance providing dehydration and retention in paper making process. Invention further relates to a paper making process using aqueous suspension containing cellulose fibers and optionally filler, wherein aqueous silicon-containing composition and at least one charged organic polymer are added to pulp.

EFFECT: improved dehydration and/or retention in paper making process and increased storage stability.

20 cl, 4 tbl, 4 ex

FIELD: pulp-and-paper and food-processing industry.

SUBSTANCE: fibrous product contains grain-based fibrous material treated with acid and having full coefficient of cellulose of at least 50% and coefficient of hemi-cellulose of at least 5%. Described are fibrous product used for obtaining preferably paper products, food products, food mixture with additive based on fibrous product, method for treating of grain-based fiber, and methods for manufacturing paper and food product.

EFFECT: increased strength of paper without increasing of main weight, increased functional properties, improved structure, coagulation and taste of food product obtained with the use of grain-based fibrous material.

36 cl, 31 dwg, 10 tbl, 20 ex

FIELD: paper-and-pulp industry.

SUBSTANCE: cellulose product contains clay having stacking of atomic planes 2R2. Product represents paper of fibrous pulp, while clay has cationic nature. Preparation of product comprises: providing aqueous suspension containing cellulose fibers and optionally filler; adding clay having stacking of atomic planes 2R2.to suspension; and dehydrating thus prepared suspension. Another method of preparing cellulose product comprises: providing aqueous suspension containing cellulose fibers and optionally filler; adding cationic clay to suspension; adding one or several draining auxiliary substances enhancing retention of filler and containing at least one cationic polymer; and dehydrating thus prepared suspension.

EFFECT: reduced interfering and harmful substance in cellulose suspension and enhanced retention of filler, dehydrating agents, and sizing agents.

27 cl, 14 tbl, 13 ex

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