WO2024105306A1 - Utilisation d'une composition comprenant un biopolymère cationique - Google Patents

Utilisation d'une composition comprenant un biopolymère cationique Download PDF

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WO2024105306A1
WO2024105306A1 PCT/FI2023/050630 FI2023050630W WO2024105306A1 WO 2024105306 A1 WO2024105306 A1 WO 2024105306A1 FI 2023050630 W FI2023050630 W FI 2023050630W WO 2024105306 A1 WO2024105306 A1 WO 2024105306A1
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cationic
dewatering
weight
biopolymer
use according
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PCT/FI2023/050630
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English (en)
Inventor
Matti Hietaniemi
Markus Korhonen
Asko Karppi
Jonas Konn
Natnael Behabtu
Douglas Adelman
Simone KNISPEL
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Kemira Oyj
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Publication of WO2024105306A1 publication Critical patent/WO2024105306A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
    • C08L5/02—Dextran; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
    • C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
    • C08B37/0009—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid alpha-D-Glucans, e.g. polydextrose, alternan, glycogen; (alpha-1,4)(alpha-1,6)-D-Glucans; (alpha-1,3)(alpha-1,4)-D-Glucans, e.g. isolichenan or nigeran; (alpha-1,4)-D-Glucans; (alpha-1,3)-D-Glucans, e.g. pseudonigeran; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
    • C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
    • C08B37/0009—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid alpha-D-Glucans, e.g. polydextrose, alternan, glycogen; (alpha-1,4)(alpha-1,6)-D-Glucans; (alpha-1,3)(alpha-1,4)-D-Glucans, e.g. isolichenan or nigeran; (alpha-1,4)-D-Glucans; (alpha-1,3)-D-Glucans, e.g. pseudonigeran; Derivatives thereof
    • C08B37/0021—Dextran, i.e. (alpha-1,4)-D-glucan; Derivatives thereof, e.g. Sephadex, i.e. crosslinked dextran
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D21H17/29—Starch cationic
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers

Definitions

  • the present invention relates to a use of a composition comprising a cationic biopolymer and to a method for increasing dewatering and/or drainage in manufacture of pulp or in manufacture of a fibrous web according to the preambles of the independent claims presented below.
  • Dewatering is an important aspect in both in manufacture of pulp as well as in manufacture of fibrous webs, such as paper, board or the like.
  • water is removed from the pulp web or pulp sheet by using press dewatering, such as twin wire presses or shoe presses. After dewatering the pulp web may be dried in a dryer comprising a number of superposed horizontal drying levels, cut into sheets and packed.
  • a dryer comprising a number of superposed horizontal drying levels, cut into sheets and packed.
  • the dewatered pulp is transferred by pumping directly to a stock preparation of paper/board machine, without intermediate drying.
  • the water removal from a fibrous web begins immediately after its formation on a forming section.
  • Dewatering on the forming section continues then with a number of vacuum boxes, which remove water from the formed web by suction.
  • the vacuum boxes are located one after another in a machine direction, and the vacuum, i.e. pressure drop, created by the vacuum boxes increases in the machine direction, as the water removal becomes more difficult with the increasing dryness of the web.
  • the fibrous web is subjected to press dewatering by mechanical pressing of the wet web in a press section.
  • Press dewatering may be performed, for example, by using means for press dewatering, such as a shoe press or pair of cylinders. Press dewatering has also an impact on the quality of the final fibrous web, as it increases the density of the formed web and affects its surface structure. After the press section the water content of the fibrous web may be around 30 - 60 weight-%. The fibrous web is then dried to the final dryness of about 93 - 95 weight-% in a drying section using e.g. heated cylinders and/or infrared radiators. Dewatering is an energy-consuming part of the production of pulp and fibrous webs. Furthermore, efficient water removal secures good runnability of the process as well as aids in achieving sufficient retention and an even formation.
  • Drainage and dewatering efficiency of the pulp or the fibrous web may be improved by using different chemicals, either alone or as various combinations.
  • the drainage and dewatering chemicals are usually synthetic polymers, presenting a cationic charge.
  • the new additives would be biodegradable, leaving no toxic residues.
  • the new additives should still provide similar or better drainage and dewatering effect.
  • the dewatering and drying are energy intensive processes, it is possible to obtain significant savings in energy consumption, when the drainage and dewatering is increased.
  • An object of the present invention is to minimise or even eliminate the disadvantages existing in the prior art.
  • An object of the present invention is to improve drainage and/or dewatering, especially dewatering, in manufacture of pulp or in manufacture of fibrous webs, such as paper, board or the like.
  • a typical use of a composition comprising a cationic biopolymer according to the present invention is as a drainage agent and/or as a dewatering agent in a manufacture of pulp or of a fibrous web comprising cellulosic fibres, wherein the cationic biopolymer is selected from cationic crosslinked a-1 ,3-glucan polymers, cationic ester- or ether-derivatives of graft copolymers of dextran and a-1 ,3-glucan, or any of their mixtures.
  • a typical method according to the present invention for increasing dewatering and/or drainage in a manufacture of pulp or of a fibrous web comprising cellulosic fibres comprises
  • a dewatering and/or drainage agent comprising a cationic biopolymer selected from cationic crosslinked a-1 ,3-glucan polymers, cationic ester- or ether-derivatives of graft copolymers of dextran and a-1 ,3-glucan or any of their mixtures,
  • cationic crosslinked a-1 ,3-glucan polymers and cationic ester- or ether-derivatives of graft copolymers of dextran and a-1 ,3-glucan can be used as drainage and dewatering agents in the manufacture of pulp as well as in the manufacture of fibrous cellulosic webs. It is assumed that the crosslinked a-1 ,3-glucan polymers have three-dimensional structure that leads to effective interaction with the fibres either in the pulp or in the fibre suspension. The same applies for ester- and ether-derivatives of the graft copolymers, where the three-dimensional structure is created by side chains grafted to a polymer backbone.
  • the cationic crosslinked polymer and the cationic graft copolymer derivative are not only effective drainage and/or dewatering agents but also help to achieve other desirable properties, such as effective retention during the dewatering and desired solids content of the formed web. Furthermore, the dewatering efficiency is obtained without loss of formation.
  • the cationic a-1 ,3-glucan polymer and the cationic graft copolymer derivatives are able to provide dewatering and/or drainage results that are acceptable, sometimes as good as, or even better than those obtained with conventional petroleum-based polymers, such as cationic polyacrylamide, glyoxylated polyacrylamide or polyvinylamine.
  • the cationic biopolymer when used according to the present invention, is able to significantly increase the sustainability of the final product.
  • composition comprising the cationic biopolymer does not cause flocculation of pulp or the fibre suspension. This means that the composition is able to provide improved drainage and/or dewatering without loss of formation.
  • drainage denotes removal of water from pulp or from a wet fibrous web by gravitation.
  • a drainage agent improves the free drainage, i.e. the removal of water by gravitation from pulp or from a wet fibrous web.
  • Mechanical water removal elements which can be used to assist the free drainage are, for example, foils, blades, forming shoes, forming rolls or forming cylinders. Drainage thus encompasses the initial water removal by gravity, for example in the beginning of the forming section, until the wet-line is achieved, i.e. the point where the change from wet to dry web can be visually observed, and air begins to go through the wet web.
  • removal of water by drainage ends when the wet web has a dryness of 3 - 7 weight-%.
  • dewatering denotes an assisted dewatering, i.e. assisted removal of water from pulp or from a wet fibrous web.
  • Dewatering encompasses both vacuum dewatering and press dewatering. After vacuum dewatering the dryness of the pulp or the fibrous web may typically increase to a dryness of 13 - 23 weight-%, preferably 14 - 20 weight-%, more preferably 16 - 22 weight-%. Vacuum dewatering is typically followed by press dewatering, where dryness of the pulp or the fibrous web is increased to a dryness of 40 - 55 weight-%, preferably 43 - 52 weight-%, more preferably 45 -50 weight-%.
  • the dryness after vacuum dewatering can be elevated by 0 - 5 percentage units, and the dryness after press dewatering is elevated by 1 - 5 percentage units, in comparison to a situation without the dewatering agent.
  • vacuum dewatering the assisted removal of water can be achieved by using a vacuum, typically of 15 - 70 kPa. Vacuum may be achieved by using blowers, suction elements, such as vacuum boxes, vacuum pumps, or couch rolls.
  • press dewatering the assisted removal of water can be achieved by using pressing nips between cylinders, or by using other mechanical dewatering means, such as shoe press, centre roll press, roll press or twin wire press or the like.
  • Dewatering also encompasses any combinations of vacuum dewatering and press dewatering, where the water is removed by using both pressing and vacuum or suction.
  • a dewatering agent improves the dewatering, i.e. the removal of water by using suction and/or by pressing from pulp or from a wet fibrous web.
  • vacuum dewatering the dewatering agent has preferably the ability to provide flocculation of fines of fibre suspension without flocculation of fibres, thus achieving good web formation and high vacuum levels for effective drying.
  • the dewatering agent has preferably the ability to neutralize charges of negatively charged fibres, fines and colloidal material, which are present in the pulp or in the wet web.
  • the negative charges cause repulsion forces, which increases the distance between the fibres, fines and colloidal material, at the same time creating space for water.
  • the charges are neutralized, the distance between the fibres, fines and colloidal material is minimized, and the water binding capacity of the pulp or the wet web is decreased.
  • water may be removed from pulp or from the fibrous web by assisted dewatering employing one or more of the following: dewatering element(s), vacuum box(es), and means for press dewatering.
  • the present invention is especially suitable for improving the dewatering of a pulp or a wet fibrous web, such as paper, board, tissue or the like.
  • the term “dextran” denotes an a-glucan comprising at least 50%, preferably at least 60%, more preferably at least 70%, even more preferably at least 80% or at least 90%, of a-1 ,6-glycosidic linkages, wherein the balance to 100% is typically a-1 ,3-glycosidic linkages.
  • Dextran may be substantially linear, which means that is has 0 - 5 % of branches before formation of graft copolymer with a-1 ,3-glucan. Possible branches in dextran itself are usually short, one to three glucose monomers in length.
  • a-1 ,3-glucan polymer and “a-1 ,3-glucan” denotes a polymeric structure having a polysaccharide backbone which comprises D-glucose units linked together by glycosidic linkages. At least 70%, preferably at least 80%, more preferably at least 90% or 95%, sometimes even of 99% or 100%, of the glycosidic linkages are a-1 ,3-linkages.
  • the cationic biopolymer may be a cationic crosslinked a-1 ,3-glucan polymer.
  • the cationic crosslinked a-1 ,3-glucan polymer used in the present invention comprises thus cationic substitution groups attached to its structure.
  • the cationic substitution group may be a substituted ammonium group, preferably a quaternary ammonium group, more preferably a trialkyl ammonium group.
  • Alkyl group in the trialkyl ammonium group may be, for example a methyl group, a hydroxymethyl group, a hydroxyethyl group or a hydroxypropyl group.
  • the substituted ammonium group may be, for example, trimethylammonium group.
  • the cationic substitution groups of the a-1 ,3-glucan polymer are able to interact with the negatively charged fibres in a manner that leads to effective drainage and/or dewatering.
  • the crosslinked a-1 ,3-glucan polymer suitable for use in the present invention may be obtained by contacting the a-1 ,3-glucan polymer with a crosslinker and a solvent, e.g. water.
  • the amount of used crosslinker may be 20 - 5000 ppm, preferably 100 - 5000 ppm, calculated of polymer dry weight.
  • a crosslinker selected from a group comprising epihalohydrins, such as epichlorohydrin; epoxy compounds; diglycidyl ethers, such as diglycidyl ether or ethylene glycol diglycidyl ether; polyvalent metals, such as zirconium carbonate or cyanuric chloride; glyoxal; and polycarboxylic acids, such as citric acid, glutaric acid, adipic acid.
  • the cationic biopolymer suitable for use in the present invention may be a cationic ester- or ether-derivative of a graft copolymer of dextran and a-1 ,3- glucan.
  • Suitable graft copolymer derivatives, methods for their preparation and determination of their glycosidic linkage profile are described, for example, in WO 2021/247810.
  • the degree of polymerization of the a-1 ,3-glucan may be in a range of 20 - 3000, preferably 500 - 2000.
  • the degree of polymerisation may be in a range of 20 - 2000 or 55 - 1000.
  • Degree of polymerization refers here to the number of glucose units comprised within an individual side chain.
  • the cationic graft copolymer may comprise 10 - 70 weight-%, preferably 20 - 60 weight-%, more preferably 30 - 50 weight-%, of dextran, calculated from the dry weight of the graft copolymer before ester or ether derivatization.
  • the cationic graft copolymer may comprise, for example 30 - 90 weight-%, preferably 40 - 80 weight-%, more preferably 50 - 70 weight-%, of a-(1 ,3-glucan), e.g. a-1 ,3-glucan side chains, calculated from the dry weight of the graft copolymer before ester or ether derivatization.
  • the cationic biopolymer may be cationic graft copolymer comprising a dextran backbone and a-1 ,3-glucan side chains, where preferably the said side chains are linked to the dextran backbone via a-1 ,2 and/or a-1 ,3 and/or a-1 ,4 branches.
  • the a-1 ,3-glucan side chains may comprise at least 70%, preferably at least 80%, more preferably at least 90% or at least 95%, sometimes even of 99% or 100%, of a-1 ,3-glycosidic linkages.
  • the graft copolymer derivatives comprise one or more cationic groups linked to the graft copolymer via an ester- or ether-linkage.
  • the cationic group may comprise a substituted ammonium group, such as primary, secondary, tertiary or quaternary ammonium group, preferably a quaternary ammonium group, more preferably a trialkyl ammonium group.
  • An ammonium group may be substituted with alkyl and/or aryl group(s), for example with C1 - C4 alkyl or C6 - C24 alkyl groups.
  • One of the groups of the substituted ammonium group comprises one carbon or a carbon chain in ether- or ester-l inkage to the graft copolymer.
  • the composition comprises a cationic biopolymer which may have a degree of cationic substitution in the range of 0.05 - 1 .2, preferably 0.1 - 1 .0, more preferably 0.1 - 0.7, even more preferably 0.15 - 0.6 or 0.25 - 0.6.
  • the degree of substitution refers to the average number of hydroxyl groups substituted with cationic groups via ether or ester linkage or via other linkage in each glucose unit in the graft copolymer or in the crosslinked copolymer. It has been observed that this degree of substitution provides the biopolymer with cationicity that results in effective dewatering effect, especially in press dewatering of pulp or wet fibrous web of paper, board or the like.
  • the high cationicity improves the water-solubility of the biopolymer, which makes it more effective for the press dewatering. Excess cationicity is, however, preferably avoided as it may cause ecotoxicity for aquatic organisms or cause unwanted flocculation. Biopolymers with excess cationicity might also contain impurities, delimiting their suitability e.g. for food contact applications.
  • the composition may comprise a cationic graft copolymer of dextran and a-1 ,3-glucan which is crosslinked.
  • the crosslinking can be performed by using the same crosslinkers as defined above.
  • Crosslinking of the branched structure of the graft copolymer further modifies the three-dimensionality of the cationic biopolymer.
  • the cationic biopolymer may have a salt viscosity of 50 - 5000 mPas, preferably 200 - 4000 mPas, measured at 2 weight-% biopolymer concentration.
  • the viscosity can be used to measure or estimate the molecular size of the biopolymer. It has been observed that the cationic biopolymer is able to provide effective dewatering effect, especially vacuum dewatering effect, when the viscosity of the cationic biopolymer is within the given ranges. It is assumed that the size of the cationic biopolymer enables optimal floc formation, especially with the fines of the fibre suspension.
  • the salt viscosity is measured for 2 weight-% biopolymer concentration, as active, in water in presence of a salt as follows. Cationic biopolymer is first dissolved in deionized water as 2 w-% solution, as active biopolymer. Then sodium chloride (NaCI) is added until the conductivity of the solution is 13 mS/cm. The salt viscosity of the obtained solution is determined by using a Brookfield DV1 viscometer with a small sample adapter at 25 °C. The viscosity measurement is performed by using maximum possible rotational speed.
  • the composition comprising the biopolymer may further comprise other chemical compounds or substances.
  • the composition may comprise salt compounds, urea compounds, cationic synthetic polymers, such as polyvinylamine or polyethyleneimine.
  • the composition may comprise or consist of a mixture of two or more biopolymers selected from cationic crosslinked a-1 ,3-glucan polymers, cationic ester- or etherderivatives of graft copolymers of dextran and a-1 ,3-glucan.
  • the composition consists of the biopolymer(s).
  • the composition comprising the cationic biopolymer may have a charge density of 0.7 - 5.0 meq/g, preferably 0.8 - 4 meq/g, more preferably 0.9 - 3.0 meq/g, measured by Mutek PCD.
  • the charge density of the composition is selected to provide an effective vacuum dewatering, while avoiding problems relating to excess cationicity, such as ecotoxicity for aquatic organisms.
  • composition comprising the cationic biopolymer selected from cationic crosslinked a-1 ,3-glucan polymers, cationic ester- or ether-derivatives of graft copolymers of dextran and alpha-glucan or any of their mixtures, is added to the aqueous fibre suspension, where it functions as drainage or dewatering agent.
  • the composition may be used in amount that provides the cationic biopolymer to the fibre suspension in amount of 0.1 - 0.8 kg/t, preferably 0.15 - 0.6 kg/t, more preferably 0.2 - 0.4 kg/t. The values are given as active substance.
  • the composition comprising the cationic biopolymer is used for improving drainage and/or dewatering, especially dewatering, in a manufacture of the fibrous web, such as paper or board, which comprises or consist of recycled cellulosic fibres.
  • a aqueous fibre suspension comprising recycled cellulosic fibres is obtained.
  • the recycled fibres may originate from recycled paper and/or old corrugated containerboard (OCC).
  • OOC old corrugated containerboard
  • the fibre suspension may comprise >20 weight-%, preferably >50 weight-%, more preferably >70 weight-%, even more preferably >80 weight-% of recycled fibres, calculated from the total dry fibre weight of the suspension.
  • the fibre suspension may even comprise 100 weight-% of recycled fibres.
  • the amount of recycled fibres in the fibre suspension may be 50 - 100 weight-%, preferably 80 - 100 weight-%, more preferably 90 - 100 weight-%.
  • the aqueous fibre suspension comprises or consists of recycled fibres, it may have a conductivity of at least 2 mS/cm, preferably at least 3 mS/cm, more preferably at least 3.5 mS/cm.
  • the conductivity may be in a range of 2 - 10 mS/cm, preferably 3 - 9 mS/cm, more preferably 3.5 - 8 mS/cm.
  • the composition comprising the biopolymer is able to provide improvement in drainage and/or dewatering even for these fibre suspensions with high conductivity.
  • the composition comprising the cationic biopolymer is used for improving drainage and/or dewatering, especially dewatering, in a manufacture of chemical or semi-chemical pulp or in manufacture of the fibrous web, such as paper or board, which comprises or consists of cellulosic fibres obtained by chemical pulping or semi-chemical pulping.
  • the composition is suitable for pulps and fibres originating from chemical and semi-chemical pulping, such as kraft pulping, sulphite pulping, neutral sulphite semi-chemical (NSSC) pulping, soda pulping or chemi-thermomechanical pulping (CTMP).
  • the composition comprising the cationic biopolymer may be added to a fibre suspension having a consistency in the range of 0.2 - 20 weight-%, preferably 0.3 - 4 weight-%, more preferably 0.3 - 1.9 weight-%.
  • the composition may be added to a thin stock having a consistency of ⁇ 19 g/l, preferably below 15 g/l.
  • the fibre suspension may have a consistency in a range of 5 - 19 g/l, preferably 5 - 15 g/l, at the time of addition of the composition comprising the biopolymer.
  • the composition may be added to the pulp having a consistency of >0.5, preferably >3 weight-%, sometimes even >6 weight-%.
  • the fibre suspension may have a consistency in a range of 0.5 - 20 weight-%, preferably 3 - 15 weight-%, at the time of addition of the composition comprising the biopolymer.
  • the composition When the composition is used as a dewatering agent in the manufacture of pulp, the composition may be added to a fibre suspension having a consistency in a range of 4 - 20 weight-%, preferably 6 - 20 weight-%, more preferably 8 - 15 weight-%.
  • a retention aid system for example comprising a cationic synthetic polymer, preferably cationic polyacrylamide, may be added to a fibre suspension comprising cellulosic fibres, optionally to provide at least a partial floc formation.
  • the retention aid system may comprise cationic poly(meth)acrylamide, obtained by polymerising (meth)acrylamide and 5 - 15 mol-% of cationic monomers, and having a weight average molecular weight in the range of 3 000 000 - 15 000 000 g/mol.
  • the cationic synthetic polymer of the retention aid system may be added to the aqueous fibre suspension before or after the addition of the composition comprising the cationic biopolymer, or simultaneously with the addition of the composition comprising the cationic biopolymer.
  • the cationic synthetic polymer is added as close to the addition of the composition comprising the cationic biopolymer as possible.
  • the cationic synthetic polymer is preferably added before the last shear stage preceding the headbox of paper or board machine.
  • the retention aid system may further comprise microparticles, preferably selected from inorganic siliceous microparticles, such as colloidal silica or bentonite.
  • the inorganic siliceous microparticles may be selected from silica-based particles, silica microgels, colloidal silica, silica sols, silica gels, polysilicates, aluminosilicates, polyaluminosilicates, borosilicates, polyborosilicates, zeolites and swellable clays, such as bentonite.
  • inorganic siliceous microparticles are selected from colloidal silica or bentonite.
  • microparticles are added after the addition of the cationic synthetic polymer of the retention system, and preferably after the last shear stage preceding the headbox of a paper or board machine or the like.
  • the microparticles may provide at least a partial reflocculation after the last shear stage.
  • the composition comprising biopolymer may be added simultaneously with the cationic polyacrylamide, optionally followed by the addition of colloidal silica microparticles.
  • Example 1 the effect of a cationic derivative of a graft copolymer of dextran and a-1 ,3-glucan on press dewatering of a fibre web comprising recycled cellulose fibres was studied.
  • Performance of a cationic graft copolymer derivative, i.e. branched polymer, having degree of substitution DS 0.4 was compared to a) the performance of a cationized linear non-crosslinked a-1 .3-glucan polymer having a degree of substitution DS 0.4, and to b) the performance of polyvinylamine, comprising 35 mol-% of vinylamine and 65 mol-% n-vinylformamine, MW 500 000 g/mol, commonly used as a dewatering agent in paper and board machines.
  • the aqueous fibre suspension of 0.3 % consistency was made from furnish obtained from Southern European RCF mill. Conductivity and pH of the fibre suspension were not adjusted from conductivity value 6.3 mS/cm and pH 6.1 .
  • DDA dynamic drainage analyzer
  • Example 2 the effect of a cationic derivative of a graft copolymer of dextran and a-1 ,3-glucan on press dewatering of a fibre web comprising recycled cellulose fibres was further studied by repeating Example 1 , but by using a different fibre suspension.
  • Example 2 The cationic graft copolymer derivative and the cationized linear non-crosslinked a- 1 ,3-glucan were the same as in Example 1 .
  • Example 2 the aqueous fibre suspension of 0.45 % consistency was made from furnish obtained from Central European RCF mill. Conductivity and pH of the fibre suspension were not adjusted from conductivity value 4.1 mS/cm and pH 6.1 .
  • Example 3 the effect of cationic graft copolymer of dextran and a-1 ,3-glucan on press dewatering of a fibre web comprising recycled cellulose fibres was studied.
  • Performance of two cationic graft copolymer derivatives, i.e. branched polymers, having degree of substitution DS 0.2 and 0.4 were compared to a) the performance of two cationized linear non-crosslinked a-1.3-glucan polymers having a degree of substitution DS 0.2 and 0.4, and to b) the performance of polyvinylamine, commonly used as a dewatering agent in paper and board machines.
  • the aqueous fibre suspension was prepared as follows. Old corrugated containerboard (OCC) from a Central European board mill was soaked for 5 minutes at 2.5 weight-% consistency, at 85 °C in chemical water having pH 6.8.
  • the chemical water was prepared by dissolving a salt mixture containing 70 weight-% calcium acetate, 20 weight-% sodium sulphate and 10 weight-t% sodium bicarbonate into deionized water until the conductivity was 3 mS/cm. After soaking, the OCC was hot-disintegrated at 30 000 rotations with a laboratory disintegrator. The obtained furnish was cooled to room temperature (about 23 °C) and diluted to 0.7 weight-% consistency before the experiments by using the same chemical water.
  • DDA dynamic drainage analyzer
  • Example 4 the effect of cationic crosslinked a-1 ,3-glucan and the effect of cationic graft copolymer of dextran and a-1 ,3-glucan on press dewatering of a fibre web comprising recycled cellulose fibres was studied.
  • Performance of a cationic graft copolymer derivative, i.e. branched polymer, having degree of substitution DS 0.3 was compared to the performance of two cationized linear crosslinked a-1 ,3-glucan polymers having a degree of substitution DS 0.3 (salt viscosity at 2%: 900 mPas) and DS 0.5 (salt viscosity at 2%: 26 mPas).
  • Cationization was performed with epoxide chemistry such as 2,3-epoxypropyl trimethylammonium chloride (EPTAC).
  • Cationic crosslinked a-1 ,3-glucan polymers were prepared from a-1 .3-glucan, DP 1500, by adding polyethyleneglycol diglycidyl ether (EDGE) as crosslinker to the cationization step.
  • EDGE polyethyleneglycol diglycidyl ether
  • the crosslinker amount was adjusted to a level, where Brookfield DV1 SSA viscosity of the polymer was increased to about 3 times compared to viscosity of the start polymer at 3% concentration and at 25 °C temperature.
  • the aqueous fibre suspension was prepared as follows. Old corrugated containerboard (OCC) from a Central European board mill was soaked for 5 minutes at 2.5 weight-% consistency, at 85 °C in chemical water, as in Example 3. After soaking, the OCC was hot-disintegrated at 30 000 rotations with a laboratory disintegrator. The obtained furnish was cooled to room temperature (about 23 °C) and diluted to 0.7 weight-% consistency before the experiments by using the same chemical water.
  • OCC Old corrugated containerboard
  • DDA dynamic drainage analyzer

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Abstract

L'invention concerne une utilisation d'une composition comprenant un biopolymère cationique en tant qu'agent de drainage et/ou en tant qu'agent de déshydratation dans une fabrication de pâte ou d'une bande fibreuse comprenant des fibres cellulosiques. Le biopolymère cationique est choisi parmi les polymères d'α-(1,3-glucane) réticulés cationiques, les dérivés d'ester ou d'éther cationiques de copolymères greffés de dextrane et d'α-1,3-glucane ou l'un quelconque de leurs mélanges. L'invention concerne également un procédé pour augmenter la déshydratation et/ou le drainage dans une fabrication de pâte ou d'une bande fibreuse.
PCT/FI2023/050630 2022-11-18 2023-11-15 Utilisation d'une composition comprenant un biopolymère cationique WO2024105306A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009136024A2 (fr) * 2008-04-10 2009-11-12 Snf S.A.S. Procédé de fabrication de papier et carton
EP2322714A1 (fr) * 2005-12-30 2011-05-18 Akzo Nobel N.V. Procédé pour la fabrication de papier
WO2021247810A1 (fr) * 2020-06-04 2021-12-09 Nutrition & Biosciences USA 4, Inc. Copolymères greffés de dextrane-alpha-glucane et leurs dérivés

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2322714A1 (fr) * 2005-12-30 2011-05-18 Akzo Nobel N.V. Procédé pour la fabrication de papier
WO2009136024A2 (fr) * 2008-04-10 2009-11-12 Snf S.A.S. Procédé de fabrication de papier et carton
WO2021247810A1 (fr) * 2020-06-04 2021-12-09 Nutrition & Biosciences USA 4, Inc. Copolymères greffés de dextrane-alpha-glucane et leurs dérivés

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PRADO HÉCTOR J ET AL: "Cationization of polysaccharides: A path to greener derivatives with many industrial applications", EUROPEAN POLYMER JOURNAL, PERGAMON PRESS LTD OXFORD, GB, vol. 52, 21 December 2013 (2013-12-21), pages 53 - 75, XP028609019, ISSN: 0014-3057, DOI: 10.1016/J.EURPOLYMJ.2013.12.011 *

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