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WO2025072390A1 - Utilisation de polymères en émulsion cationique à inversion rapide avec des polyvinylamines en tant qu'adjuvants de rétention et d'égouttage - Google Patents

Utilisation de polymères en émulsion cationique à inversion rapide avec des polyvinylamines en tant qu'adjuvants de rétention et d'égouttage Download PDF

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Publication number
WO2025072390A1
WO2025072390A1 PCT/US2024/048491 US2024048491W WO2025072390A1 WO 2025072390 A1 WO2025072390 A1 WO 2025072390A1 US 2024048491 W US2024048491 W US 2024048491W WO 2025072390 A1 WO2025072390 A1 WO 2025072390A1
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Prior art keywords
qic
ranging
pvam
stock
cationic
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PCT/US2024/048491
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English (en)
Inventor
Martin Dallaire
Yuping Luo
Jean-Francois Roy
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Kemira Oyj
Kemira Water Solutions Inc
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Kemira Oyj
Kemira Water Solutions Inc
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Priority claimed from CA3219590A external-priority patent/CA3219590A1/en
Application filed by Kemira Oyj, Kemira Water Solutions Inc filed Critical Kemira Oyj
Publication of WO2025072390A1 publication Critical patent/WO2025072390A1/fr
Pending legal-status Critical Current
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Classifications

    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
    • D21H11/18—Highly hydrated, swollen or fibrillatable fibres
    • 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/56—Polyamines; Polyimines; Polyester-imides
    • 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 generally relates to methods and compositions for manufacture of tissue, paper, or board and for enhancing retention and drainage thereof.
  • the disclosure provides methods for enhancing retention and drainage by addition of a retention and drainage aid comprising a quick inversion cationic emulsion polymers and polyvinyl amine polymers. Preparation of paper sheets under these conditions provides improved retention, gravimetric drainage rates, and DDA drainage time, without over-flocculation.
  • Recycled fiber materials such as old corrugated containerboard (OCC), mixed office waste (MOW), and Old Magazines(OMG) are commonly used as raw material for paper and board, such as recycled liner grades. Pulp quality from recycled papers is poor in fiber strength, and recycled fibers have a high level of fines and mineral fillers, which negatively impact retention, drainage, and dryer steam consumption during recycled liner making processes.
  • a dilute aqueous composition known as "furnish” or "stock” is sprayed onto a moving mesh known as a "wire” or “wire screen”.
  • Solid components of this composition such as cellulosic fibers, fines, and inorganic particulate mineral fillers captured or filtered by the wire to form a sheet.
  • the percentage of solid material retained on the wire is known as the "retention" of the papermaking process. Retention aids are used to improve the capture efficiency of the solid components onto the mesh, thereby reducing the total suspended solids in the filtrate.
  • Drainage relates to the rate of removal of water from the furnish as the paper sheet is formed. Drainage usually refers to water removal which takes place in the "drainage zone" (e.g., gravity and vacuum drainage sections) of the paper machine primarily before any pressing of the wet paper web.
  • Drainage aids are used to improve the overall efficiency of dewatering in the production of paper or paperboard.
  • the sheet After dewatering, the sheet is subjected to a drying process to remove residual water.
  • dryer sections include steam cylinders and air dyers. Efficient dewatering during the preceding steps, such as by use of drainage aids, allows for the reduction of steam and energy consumption during drying processes.
  • Retention and drainage aids for papermaking are generally added to the furnish or stock prior to addition to the headbox of the paper machine with the goal of providing enhanced on-machine retention and drainage while also providing additional benefits, such as improved paper strength and wet pressability. These requirements are especially challenging for papermaking operations in mills with high recycled content.
  • Typical retention and drainage aids include high molecular weight cationic polymers or CPAM/silica retention programs. When added to recycled fibers, these additives create large flocs (i.e., over-flocculation) of recycled pulp, making recycled paper less uniform and causing poor formation. A poorly formed sheet containing large fiber flocs will exhibit a high gravimetric drainage rate and will drain quickly in the initial hydrofoil section of a paper machine.
  • this over-flocculated sheet will respond poorly to vacuum in later parts of the forming section, resulting in a reduction of vacuum drainage (press dewatering) rate. Because of increased captured water in the large flocs, the sheet will also require an increase of dryer steam consumption.
  • PCT/US99/29135 discloses a polyampholyte coagulant, which is used as a retention/drainage/formation aid in a papermaking process.
  • retention and drainage aids remain inadequate for manufacture of paper and board with a high percentage of recycled fiber content.
  • PVAm Polyvinylamine
  • PVAm Polyvinylamine
  • PVAm comprises high cationic charge density and low molecular weight and is an effective coagulant for trapping anionically charged fibers, fines, and fillers.
  • PVAm polymers usually create small fiber-flocs and do not increase fiber floc size as the PVAm polymer dosage increases. Therefore, PVAm polymers have been widely used to improve vacuum drainage rate, press dewatering rate, and to reduce dryer steam consumption without deteriorating sheet formation for recycled paper machines.
  • PVAm polymers are very expensive and many recycled liner board paper mills cannot afford to use PVAm as a drainage agent.
  • the present invention generally relates to methods and compositions for manufacture of tissue, paper, or board and for enhancing retention and drainage thereof.
  • 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
  • a retention and drainage aid comprising quick inversion cationic emulsion polyacrylamides (QIC-EPAMS) and polyvinylamine (PVAm) polymers
  • the present invention provides a method for manufacture of tissue, paper, or board, the method comprising:
  • step (c) wherein the method comprises, prior to step (c), treating the thick stock and/or the thin stock with a retention and drainage aid comprising:
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • AM acrylamide
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • said one or more PVAm polymers and said one or more QIC-EPAMs are:
  • steps (a)-(f) are optionally followed by a mixing time ranging from 0.01-10 min, 0.1-5 min, or 1-2 min.
  • said one or more PVAm polymers [0028] (a) comprise a weight average molecular weight ranging from 50-3000 kDa, 100-2000 kDa, 200-2000 kDa, or 400-800 kDa;
  • (b) comprise a cationic charge density ranging from below 5.0 mEq/g, 0.5-5.0 mEq/g, 1.0-4.0 mEq/g, or 1.5-2.5 mEq/g as dry solids at pH 7;
  • (c) comprise a polymer synthesized by Hofmann degradation of a base polymer comprising (i) acrylamide; (ii) methacrylamide; (iii) a copolymer of acrylamide and cationic monomers selected from the group consisting of dimethylaminoethyl acrylate (DMAEA), quaternized dimethylaminoethyl methacrylate (DMAEMA), dimethyldiallylammonium chloride (DADMAC), acrylamidopropyltrimethylammonium chloride (APTAC), and methacrylamidopropyltrimethylammonium chloride (MAPTAC); or (iv) a copolymer of acrylamide and DADMAC;
  • DAEA dimethylaminoethyl acrylate
  • DMAEMA quaternized dimethylaminoethyl methacrylate
  • DDADMAC dimethyldiallylammonium chloride
  • ATAC acrylamidopropyltrimethylam
  • (d) comprise a polymer synthesized by total or partial hydrolysis of one or more poly(N-vinylformamide) homopolymers or copolymers, wherein said one or more poly(N- vinylformamide) homopolymers or copolymers are optionally synthesized by radical polymerization of N-vinylformamide or by radical polymerization of N-vinylformamide and one or more additional monomers and further comprising a degree of hydrolysis ranging from 1-100 mol%, 20-100 mol%, 40-100 mol%, 60-100 mol%, or 80-100 mol%;
  • (e) comprise a polymer synthesized by partial hydrolysis of one or more poly(N- vinylformamide) homopolymers and further comprising a degree of hydrolysis ranging from 30-50 mol%, 35-45 mol%, or about 40 mol%;
  • (f) are formulated optionally as a dry powder or as an aqueous composition comprising a PVAm solids % by mass ranging from about 0.5% to about 30%, optionally from greater than 2% to about 25%, further optionally from about greater than 10% to about 22%; or
  • (a) comprise an acrylamide (AM) monomer content ranging from 60-85 wt%, 65-85 wt%, 70-85 wt%, or 70-80 wt%;
  • AM acrylamide
  • (b) comprise a cationic acryloyloxyethyltrimethyl ammonium chloride (Q9) monomer content ranging from ⁇ 40 wt%, 15-40 wt%, 15-35 wt%, 15-30 wt%, or 20-30 wt%; or
  • (c) comprise an inverse phase emulsion, a dry polymer, or an aqueous polymer solution, preferably an inverse phase emulsion;
  • (d) comprise a polymer standard viscosity (SV) ranging from less than or equal to 3.5 cPs, 2.0- 3.5, 2.5-3.5 cPs, or 3.0-3.5 cPs; or
  • said retention and drainage aid optionally further comprises one or more cationic dry polyacrylamides (DPAMs) and/or one or more inorganic microparticles, wherein:
  • said more cationic dry polyacrylamides comprise acrylamide (AM) monomers and one or more cationic monomers, wherein said one or one or more cationic monomers are selected from the group consisting of acryloyloxyethyltrimethyl ammonium chloride ("AETAC”), methacryloyloxyethyltrimethylammonium chloride (“MAETAC”), methacrylamidopropyltrimethylammonium chloride (“MAPTAC”), acrylamidopropyltrimethylammonium chloride (“APTAC”), methacryloyloxyethyldimethylammonium sulfate, diallyldimethylammonium chloride (“DADMAC”); dialkylaminoalkyl acrylates and dialkylaminoalkyl methacrylates and their quaternary or acid salts, including but not limited to, dimethylaminoethyl acrylate (“DMAEA”), dimethylamino
  • said one or more inorganic microparticles are selected from the group of microparticles and nanoparticles consisting of silica microparticles; colloidal silica; aluminum phyllosilicate mineral particles, including but not limited to bentonite, sodium bentonite, calcium bentonite, and montmorillonite.
  • the method comprises one or more of the following:
  • (a)said one or more quick inversion cationic emulsion polyacrylamides comprise an acrylamide (AM) monomer content ranging from 70-80 wt% and a cationic acryloyloxyethyltrimethyl ammonium chloride (Q9) monomer content ranging from 20-30 wt%; comprises an inverse phase emulsion; and comprises a polymer standard viscosity (SV) ranging from 3.0-3.5 cPs;
  • said one or more PVAm polymers comprise a weight average molecular weight ranging from 400-800 kDa; or
  • said one or more inorganic microparticles comprise bentonite, sodium bentonite, or calcium bentonite.
  • said retention and drainage aid comprises a ratio of said one or more QIC-EPAMs to said one or more PVAms ranging from 1:60 to 1:1; 1:30-1:1; 1:6 to 1:1; or 1:3 to 1:1;
  • said one or more PVAm polymers are added at a dosage ranging from 0.2-12 kg/t, 0.2-10 kg/t, 0.2-8 kg/t, 0.2-6 kg/t, 0.2-2 kg/t, or 0.2-0.6 kg/t;
  • said one or more QIC-EPAMs are added at a dosage ranging from 0.1-1 kg/t, 0.1- 0.5 kg/t, or 0.1-0.2 kg/t;
  • said one or more DPAMs are added at a dosage ranging from 0.1-lkg/t, 0.1-0.5 kg/t, or 0.2-0.4 kg/t;
  • said one or more inorganic microparticles are added at a dosage ranging from 0.1- 4 kg/t, 1-4 kg/t, or 2-4 kg/t; or
  • the method comprises one or more of the following:
  • the thick stock comprises a consistency ranging from 1-5%, 1-3%, or 1-1.5%, wherein consistency refers to % by weight of total suspended solids in the aqueous slurry;
  • the thin stock comprises a consistency ranging from 0.3-1%, 0.4-1%, 0.5-1%, or 0.5-0.7%;
  • the thick stock is diluted to form the thin stock by addition of water, chemical water, synthetic water, white water, and/or process water; or
  • the thick stock and or the thin stock optionally further comprise one or more additives relating to papermaking, including but not limited to, starches, dyes, bleaching agents, sizing agents, wet strength agents, dry strength agents, or detackifiers; or
  • said aqueous suspension of cellulosic fibers comprises a pH ranging from 4-8, 4-7.5, 4-7, 4.5-7, or 5-7 and further comprises:
  • OCC old corrugated cardboard
  • MOW mixed office waste
  • ONTP old newspaper pulp
  • OMG old magazines
  • mill broke fibers or coated broke
  • NSC neutral sulfite semi chemical
  • an amount of pulp fines and/or an amount of mineral fillers ranging from 5-30% by mass of total solids in the aqueous suspension, wherein the amount of pulp fines pulp fines comprises pulp particles small enough to pass through a 76 pm diameter hole and said amount of mineral fillers comprise calcium carbonate, clays, kaolinite, aluminum silicates, talc, and/or gypsum; or
  • the method when used for manufacture of tissue, paper, or board, the method results in:
  • the present invention provides a method for manufacture of tissue, paper, linerboard, or board, the method comprising: [0080] (a) forming or providing a thick stock comprising an aqueous suspension of cellulosic fibers, optionally comprising 40-100%, 60-100%, or 80-100% by weight recycled cellulosic fibers;
  • step (c) wherein the method comprises, prior to step (c), treating the thick stock and/or the thin stock with a retention and drainage aid comprising:
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • AM acrylamide
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • said QIC-EPAM comprises an inverse phase emulsion
  • SV polymer standard viscosity
  • DPAMs cationic dry polyacrylamides
  • inorganic microparticles comprising bentonite
  • said one or more PVAm polymers and said one or more QIC-EPAMs are:
  • the present invention provides a thick stock comprising an aqueous suspension comprising a consistency ranging from 1-5%, 1-3%, or 1-1.5%; a recycled cellulosic fiber content ranging from 40-100%; and a retention and drainage aid comprising:
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • AM acrylamide
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • said QIC-EPAM comprises an inverse phase emulsion
  • SV polymer standard viscosity
  • DPAMs cationic dry polyacrylamides
  • inorganic microparticles comprising bentonite
  • said retention and drainage aid comprises a ratio of said one or more QIC-EPAMs to said one or more PVAms ranging from 1:60 to 1:1; 1:30-1:1; 1:6 to 1:1; or 1:3 to 1:1;
  • the present invention provides a thin stock comprising an aqueous suspension comprising a consistency ranging from 0.3-1%, 0.4-1%, 0.5-1%, or 0.5-0.7%; a recycled cellulosic fiber content ranging from 40-100%; and a retention and drainage aid comprising:
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • AM acrylamide
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • said QIC-EPAM comprises an inverse phase emulsion
  • SV polymer standard viscosity
  • DPAMs cationic dry polyacrylamides
  • inorganic microparticles comprising bentonite
  • the present invention provides a composition for use as a retention and drainage aid in manufacture of tissue, paper, or board, the composition comprising:
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • AM acrylamide
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • said QIC-EPAM comprises an inverse phase emulsion
  • SV polymer standard viscosity
  • FIG 1 provides an exemplary graph showing DDA drainage time % gain over blank and DDA permeability % gain over blank for recycled liners prepared from OCC furnish treated with PVAms and QIC-EPAM according to Example 2.
  • FIG 2 provides an exemplary graph showing DDA drainage time % gain over blank and DDA filtrate turbidity (NTU) for recycled liners prepared from OCC furnish treated with PVAms and QIC-EPAM according to Example 3.
  • FIG 3 provides an exemplary graph showing gravimetric water retention determined by Canadian Standard Freeness (CSF) testing for recycled liners prepared from 100% OCC furnish treated with PVAms and QIC-EPAM according to Example 4.
  • CSF Canadian Standard Freeness
  • FIG 4 provides an exemplary graph showing DDA drainage time for recycled liners prepared from OCC furnish treated with PVAms and QIC-EPAM according to Example 4.
  • emulsion polymer generally refers to inverse emulsions (water-in-oil) in which water droplets containing the polymer are suspended in an oil phase, also termed a hydrophobic phase.
  • liquid polymer refers to a combination of at least one polymer and a liquid, typically an aqueous liquid.
  • the polymer in a may be thoroughly dissolved or may be a partially dissolved suspension, dispersion, or slurry.
  • An "aqueous polymer mixture” or “hydrated polymer composition” refers to a combination of at least one polymer and an aqueous liquid. When a dry polymer is combined with an aqueous liquid, the polymer is initially partially hydrated at the polymer-water interface.
  • Polymers do not dissolve instantaneously in aqueous or non-aqueous solvents. Dissolution is controlled by either the disentanglement of the polymer chains or by the diffusion of the chains through a boundary layer adjacent to the polymer-solvent interface. After thorough mixing, the polymer may become fully hydrated, at which point the wetting process is complete and the polymer may be either partially dissolved or fully dissolved, depending on the nature and composition of the polymer and solvent.
  • water-soluble polymer generally refers to any polymer that may dissolve and/or disperse in water.
  • Said polymers may modify the physical properties of aqueous systems undergoing gelation, thickening, viscosification, or emulsification/stabilization.
  • Said polymers may perform a variety of functions, including but not limited to use as dispersing and suspending agents, stabilizers, thickeners, viscosifiers, gellants, flocculants and coagulants, film-formers, humectants, binders, and lubricants.
  • the term "monomer” generally refers to nonionic monomers, anionic monomers, cationic monomers, zwitterionic monomers, betaine monomers, and amphoteric ion pair monomers.
  • Q9 monomer refers to 2-(acryloyloxy)ethyl] trimethylammonium chloride (Q9) which has a molecular formula of C8H16CINO2 and a molecular weight of 193.67 g/mol.
  • acrylamide or "AM” refers to a neutral monomer of molecular formula: C3H5NO and a molecular weight of 71.08 g/mol.
  • cationic monomer generally refers to a monomer that possesses a positive charge. Examples thereof include acryloyloxy ethyl trimethylammonium chloride (Q9) monomers. Cationic monomers may also be selected from acryloyloxyethyltrimethyl ammonium chloride ("AETAC”), methacryloyloxyethyltrimethylammonium chloride (“MAETAC”), methacrylamidopropyltrimethylammonium chloride (“MAPTAC”), acrylamidopropyltrimethylammonium chloride (“APTAC”), methacryloyloxyethyldimethylammonium sulfate, diallyldimethylammonium chloride (“DADMAC”); dialkylaminoalkyl acrylates and dialkylaminoalkyl methacrylates and their quaternary or acid salts, including but not limited to, dimethylaminoethyl acrylate (“DM)
  • AETAC acryloyl
  • PVAm polyvinylamine
  • VAm polymer any polymer having vinyl amine units (i.e., 1-aminoethylene units or N- ethenylamine units).
  • PVAms are highly cationica I ly charged at typical operating pH for papermaking applications. PVAm adsorbs spontaneously and irreversibly on cellulosic fiber surfaces in water, thereby generating cationic surface properties on the fiber.
  • PVAm polymers typically having high cationic charge density and low molecular weight, function in papermaking as coagulants to form small fiber-flocs and do not increase fiber floc size as the PVAm polymer dosage increases.
  • PVAm polymers have been widely used to improve vacuum drainage rate, press dewatering rate and reduce dryer steam consumption without deteriorating sheet formation for recycled paper machines. PVAms are also widely used in papermaking as strengthening agents. One significant drawback is that PVAm polymers are very expensive. Many paper mills, especially those producing recycled liner board, cannot afford to use PVAm as a drainage agent.
  • PVAm may be prepared by free radical polymerization of N-vinyl formamide to form poly-N-vinylformamide (PNVF) and subsequent hydrolysis of formamide groups to amines, thereby forming PVAm.
  • PNVF poly-N-vinylformamide
  • Such hydrolysis may be base catalyzed, such as by hydroxide ion, or acid catalyzed.
  • Hydrolysis of PNVF initially forms copolymers comprising PNVF and PVAm (PNVF-co-PVAm), which may be completely hydrolyzed to form PVAm with little to no residual PNVF.
  • the one or more PVAm polymers may comprise vinyl amine polymers and PNVF-co-PVAm copolymers, which contain other cationic, anionic, and/or nonionic monomers, including but not limited to, acrylamide, acrylic acid, acrylate, N-butyl acrylate, and polyethylenimine (i.e., polyaziridine) monomer units.
  • PVAm may have a cationic charge density ranging from 1 to 2 m Eq per gram.
  • PVAm may have a weight average molecular weight ranging from 0.5 to 2.5 million Da.
  • the one or more PVAm polymers comprise a polymer synthesized by Hofmann degradation of a base polymer comprising (i) acrylamide; (ii) methacrylamide; (iii) a copolymer of acrylamide and cationic monomers selected from the group consisting of dimethylaminoethyl acrylate (DMAEA), quaternized dimethylaminoethyl methacrylate (DMAEMA), dimethyldiallylammonium chloride (DADMAC), acrylamidopropyltrimethylammonium chloride (APTAC), and methacrylamidopropyltrimethylammonium chloride (MAPTAC); or (iv) a copolymer of acrylamide and DADMAC.
  • DAEA dimethylaminoethyl acrylate
  • DMAEMA quaternized dimethylaminoethyl methacrylate
  • DDADMAC dimethyldiallylammonium chloride
  • ATAC acrylamidoprop
  • the one or more PVAm polymers comprise a polymer synthesized by total or partial hydrolysis of one or more poly(N-vinylformamide) homopolymers or copolymers, wherein said one or more poly(N-vinylformamide) homopolymers or copolymers are optionally synthesized by radical polymerization of N- vinylformamide or by radical polymerization of N-vinylformamide and one or more additional monomers and further comprising a degree of hydrolysis ranging from 1-100 mol%, 20-100 mol%, 40-100 mol%, 60-100 mol%, or 80-100 mol%.
  • the one or more PVAm polymers comprise a polymer synthesized by partial hydrolysis of one or more poly(N-vinylformamide) homopolymers and further comprising a degree of hydrolysis ranging from 30-50 mol%, 35-45 mol%, or about 40 mol%.
  • the "degree of hydrolysis" of a PVAm polymer refers to the mole % of PNVF units that have been hydrolyzed to vinyl amine units.
  • a PNVF-co-PVAm polymer with a degree of hydrolysis of 50 mol% comprises a 1:1 mol ratio of N-vinyl formamide and vinylamine units.
  • a PVAm with a degree of hydrolysis of 100 mol% comprises vinylamine units and no residual N-vinyl formamide units.
  • the one or more PVAm polymers may comprise a degree of hydrolysis ranging from 30-100 mol%, 40-100 mol%, 60-100 mol%, or 80-100 mol%.
  • the term “added separately” refers to addition of two or more additives (e.g., process aid components, chemicals, polymers, etc.) sequentially in any order or simultaneously to an aqueous suspension of cellulosic fibers.
  • aqueous solution generally refers to a mixture of water and a water-soluble solute or solutes which are completely dissolved with little to no residual undissolved polymer gel.
  • the solution may be homogenous.
  • the polymer product is preferably fully dissolved and the obtained polymer solution is preferably free from discrete polymer particles or granules or residual gel.
  • total solids or “total suspended solids” are used interchangeably herein and generally refer the total amount or weight of suspended solids contained in oil sands or other sands comprising dispersion. "Total solids” or “total suspended solids” generally does not include dissolved solids.
  • ppm refers to parts per million on the basis of milligrams of solute per liter of aqueous solution or slurry (e.g., mg/L).
  • the terms “Ibs/ton” or “#/T” denote pounds of dry mass of added material (e.g., additive, solute, and/or particle) per ton of suspended solids (e.g., weight of AKD per total dry ton of suspended solids).
  • the terms “kg/T” or “kg/ton” denote kilograms of dry mass (additive, solute, and/or particle) per ton of slurry, stock, and/or furnish.
  • % by wt denotes pounds of dry mass of additive per dry mass of solids in the formulation, solution, or slurry, multiplied by 100%.
  • CSF is a measure of water drainage rates from fibers and is often used to characterize the degree of fiber fibrillation in pulp and paper science. The freeness has been shown to be related to the surface conditions and swelling of the fibers (TAPPI 1999b). CSF is obtained by gravimetric water retention methods.
  • Retention is a function of different mechanisms, such as filtration by mechanical entrainment, electrostatic attraction, and bridging between the fibers and the fillers in the furnish. Because both the cellulosic fibers and many common filler materials are negatively charged, they are mutually repellent. Generally, the only factor tending to enhance retention is mechanical entrainment. Therefore, a retention aid is generally used to improve retention of the fibers and fillers on the wire.
  • Recycled fiber material is commonly used as raw material for paper or board.
  • the recycled fiber material comprises in addition to the fibers a high level of fines and fillers. Greater retention of fines and fillers is highly desired and permits a reduction in the content of cellulosic fiber.
  • pulps of inferior quality are employed to reduce papermaking costs, the retention aspect of papermaking becomes even more important. This is due to the higher level of fines found in lower quality pulps, such as recycled fiber and coated broke.
  • Greater retention of fines, fillers, and other slurry components also reduces the amount of such substances lost to the white water. This reduces the amount of material wastes, the cost of waste disposal, and the adverse environmental effects therefrom.
  • Retention and drainage aids for papermaking are generally added to the furnish or stock prior to addition to the headbox of the paper machine with the goal of providing enhanced on-machine retention and drainage while also providing additional benefits, such as improved paper strength and wet pressability. These requirements are especially challenging for papermaking operations in mills with high recycled content.
  • Typical retention and drainage aids include high molecular weight cationic polymers or CPAM/silica retention programs. When added to recycled fibers, these additives create large flocs (i.e., over-flocculation) of recycled pulp, making recycled paper less uniform and causing poor formation. A poorly formed sheet containing large fiber flocs will exhibit a high gravimetric drainage rate and will drain quickly in the initial hydrofoil section of a paper machine.
  • this over-flocculated sheet will respond poorly to vacuum in later parts of the forming section, resulting in a reduction of vacuum drainage (press dewatering) rate. Because of increased captured water in the large flocs, the sheet will also require an increase of dryer steam consumption.
  • the present invention provides a process for using a novel QIC-EPAM with PVAm as a drainage/retention aid program in making recycled OCC liners.
  • a synergic effect between PVAms and the novel QIC-EPAM has been surprisingly observed in industrial settings on paper machines. The synergic effect allows for a significant reduction of expensive PVAm dosage levels and achieves equal or better retention and drainage results without overflocculation.
  • Retention and drainage aids of the present invention comprising QIC-EPAM + PVAm provide several advantages over the conventional PVAm only drainage/retention program: 1) QIC-EPAM + PVAm can be used as pump and go products without conventional emulsion polymer inverting and aging tanks; 2) QIC-EPAM + PVAm provides small tight fiber flocs like PVAm and improves the effects of vacuum drainage/press dewatering for 100% recycled paper grades; 3) 20-40% PVAm dosage reduction has been observed on paper machines by combining PVAm with 0.25-1.2 Kg/ton of QIC-EPAM; 4) the combination of PVAm and QIC- EPAM can be added onto a paper machine by the following addition processes: (a) premixed prior to addition to the thick stock; ( b) premixed prior to addition to the thin stock; (c)added separately to the thick stock; (d) added separately to the thin stock; (e) added separately, wherein the one or more PVAm polymers are added to the thick stock and the one or more Q
  • the present invention generally relates to methods and compositions for manufacture of tissue, paper, or board and for enhancing retention and drainage thereof.
  • 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
  • a retention and drainage aid comprising quick inversion cationic emulsion polyacrylamides (QIC-EPAMS) and polyvinylamine (PVAm) polymers
  • the present invention provides a method for manufacture of tissue, paper, or board, the method comprising:
  • step (c) wherein the method comprises, prior to step (c), treating the thick stock and/or the thin stock with a retention and drainage aid comprising:
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • AM acrylamide
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • said one or more PVAm polymers and said one or more QIC-EPAMs are:
  • steps (a)-(f) are optionally followed by a mixing time ranging from 0.01-10 min, 0.1-5 min, or 1-2 min.
  • (a) comprise a weight average molecular weight ranging from 50-3000 kDa, 100-2000 kDa, 200-2000 kDa, or 400-800 kDa ;
  • (b) comprise a cationic charge density ranging from below 5.0 mEq/g, 0.5-5.0 mEq/g, 1.0-4.0 mEq/g, or 1.5-2.5 mEq/g as dry solids at pH 7;
  • (c) comprise a polymer synthesized by Hofmann degradation of a base polymer comprising (i) acrylamide; (ii) methacrylamide; (iii) a copolymer of acrylamide and cationic monomers selected from the group consisting of dimethylaminoethyl acrylate (DMAEA), quaternized dimethylaminoethyl methacrylate (DMAEMA), dimethyldiallylammonium chloride (DADMAC), acrylamidopropyltrimethylammonium chloride (APTAC), and methacrylamidopropyltrimethylammonium chloride (MAPTAC); or (iv) a copolymer of acrylamide and DADMAC;
  • DAEA dimethylaminoethyl acrylate
  • DMAEMA quaternized dimethylaminoethyl methacrylate
  • DDADMAC dimethyldiallylammonium chloride
  • ATAC acrylamidopropyltrimethylam
  • (d) comprise a polymer synthesized by total or partial hydrolysis of one or more poly(N-vinylformamide) homopolymers or copolymers, wherein said one or more poly(N- vinylformamide) homopolymers or copolymers are optionally synthesized by radical polymerization of N-vinylformamide or by radical polymerization of N-vinylformamide and one or more additional monomers and further comprising a degree of hydrolysis ranging from 1-100 mol%, 20-100 mol%, 40-100 mol%, 60-100 mol%, or 80-100 mol%;
  • (e) comprise a polymer synthesized by partial hydrolysis of one or more poly(N- vinylformamide) homopolymers and further comprising a degree of hydrolysis ranging from 30-50 mol%, 35-45 mol%, or about 40 mol%;
  • (f) are formulated optionally as a dry powder or as an aqueous composition comprising a PVAm solids % by mass ranging from about 0.5% to about 30%, optionally from greater than 2% to about 25%, further optionally from about greater than 10% to about 22%; or
  • (a) comprise an acrylamide (AM) monomer content ranging from 60-85 wt%, 65-85 wt%, 70-85 wt%, or 70-80 wt%;
  • AM acrylamide
  • (b) comprise a cationic acryloyloxyethyltrimethyl ammonium chloride (Q9) monomer content ranging from ⁇ 40 wt%, 15-40 wt%, 15-35 wt%, 15-30 wt%, or 20-30 wt%; or
  • (c) comprise an inverse phase emulsion, a dry polymer, or an aqueous polymer solution, preferably an inverse phase emulsion;
  • (d) comprise a polymer standard viscosity (SV) ranging from less than or equal to 3.5 cPs, 2.0- 3.5, 2.5-3.5 cPs, or 3.0-3.5 cPs; or
  • said retention and drainage aid optionally further comprises one or more cationic dry polyacrylamides (DPAMs) and/or one or more inorganic microparticles, wherein:
  • said more cationic dry polyacrylamides comprise acrylamide (AM) monomers and one or more cationic monomers, wherein said one or one or more cationic monomers are selected from the group consisting of acryloyloxyethyltrimethyl ammonium chloride ("AETAC”), methacryloyloxyethyltrimethylammonium chloride (“MAETAC”), methacrylamidopropyltrimethylammonium chloride (“MAPTAC”), acrylamidopropyltrimethylammonium chloride (“APTAC”), methacryloyloxyethyldimethylammonium sulfate, diallyldimethylammonium chloride (“DADMAC”); dialkylaminoalkyl acrylates and dialkylaminoalkyl methacrylates and their quaternary or acid salts, including but not limited to, dimethylaminoethyl acrylate (“DMAEA”), dimethylamino
  • said one or more inorganic microparticles are selected from the group of microparticles and nanoparticles consisting of silica microparticles; colloidal silica; aluminum phyllosilicate mineral particles, including but not limited to bentonite, sodium bentonite, calcium bentonite, and montmorillonite.
  • the method comprises one or more of the following:
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • QIC-EPAMs acrylamide (AM) monomer content ranging from 70-80 wt% and a cationic acryloyloxyethyltrimethyl ammonium chloride (Q9) monomer content ranging from 20-30 wt%; comprises an inverse phase emulsion; and comprises a polymer standard viscosity (SV) ranging from 3.0-3.5 cPs;
  • said one or more PVAm polymers comprise a weight average molecular weight ranging from 400-800 kDa; or
  • said one or more inorganic microparticles comprise bentonite, sodium bentonite, or calcium bentonite.
  • said retention and drainage aid comprises a ratio of said one or more QIC-EPAMs to said one or more PVAms ranging from 1:60 to 1:1; 1:30-1:1; 1:6 to 1:1; or 1:3 to 1:1;
  • said one or more inorganic microparticles are added at a dosage ranging from 0.1- 4 kg/t, 1-4 kg/t, or 2-4 kg/t; or
  • the thick stock comprises a consistency ranging from 1-5%, 1-3%, or 1-1.5%, wherein consistency refers to % by weight of total suspended solids in the aqueous slurry;
  • NSC neutral sulfite semi chemical
  • step (c) wherein the method comprises, prior to step (c), treating the thick stock and/or the thin stock with a retention and drainage aid comprising:
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • AM acrylamide
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • said QIC-EPAM comprises an inverse phase emulsion
  • SV polymer standard viscosity
  • (iii) optionally, one or more cationic dry polyacrylamides (DPAMs) and/or one or more inorganic microparticles comprising bentonite.
  • DPAMs cationic dry polyacrylamides
  • said one or more PVAm polymers and said one or more QIC-EPAMs are:
  • the present invention provides a thick stock comprising an aqueous suspension comprising a consistency ranging from 1-5%, 1-3%, or 1-1.5%; a recycled cellulosic fiber content ranging from 40-100%; and a retention and drainage aid comprising:
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • AM acrylamide
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • said QIC-EPAM comprises an inverse phase emulsion
  • SV polymer standard viscosity
  • DPAMs cationic dry polyacrylamides
  • inorganic microparticles comprising bentonite
  • said retention and drainage aid comprises a ratio of said one or more QIC-EPAMs to said one or more PVAms ranging from 1:60 to 1:1; 1:30-1:1; 1:6 to 1:1; or 1:3 to 1:1;
  • the present invention provides a thin stock comprising an aqueous suspension comprising a consistency ranging from 0.3-1%, 0.4-1%, 0.5-1%, or 0.5-0.7%; a recycled cellulosic fiber content ranging from 40-100%; and a retention and drainage aid comprising: [0277] (a) one or more polyvinylamine (PVAm) polymers;
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • AM acrylamide
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • said QIC-EPAM comprises an inverse phase emulsion
  • SV polymer standard viscosity
  • DPAMs cationic dry polyacrylamides
  • inorganic microparticles comprising bentonite
  • the present invention provides a composition for use as a retention and drainage aid in manufacture of tissue, paper, or board, the composition comprising:
  • QIC-EPAMs quick inversion cationic emulsion polyacrylamides
  • AM acrylamide
  • Q9 cationic acryloyloxyethyltrimethyl ammonium chloride
  • said QIC-EPAM comprises an inverse phase emulsion
  • SV polymer standard viscosity
  • DDA drainage time Cellulosic fibrous webs were prepared and drainage times were analyzed by dynamic drainage analyzer (DDA) testing according to the following. An aliquot of cellulosic stock (500-700 mL) with a consistency of 0.5 to 0.7% by wt (Total Suspended solids, TSS) was mixed with chemical additives. Chemicals were added in a time sequence that simulates where the chemicals are added on the paper machine. Blank samples contained no added chemical. After mixing, the flocculated stock was drained through a 60 mesh screen under vacuum (250 mBar). Drainage time was determined by measuring the time until vacuum break (i.e., a rapid increase in vacuum pressure). Shorter drainage times indicates better drainage.
  • TSS Total Suspended solids
  • DDA Drainage % Gain was determined by calculating the % decrease in drainage time compared to the blank (no chemical additive). For the present examples, higher DDA Drainage % Gain above the drainage lower limit line indicated on FIGS 1-2 is preferred. DDA filtrates were used for turbidity testing as set forth below.
  • Permeability of fiber pads from DDA drainage testing was determined by tracking the air flow time in the pressed fiber pad during the DDA drainage tests.
  • Permeability % Gain was determined by calculating the % increase in permeability compared to the blank (no chemical additive).
  • the percentage of sheet permeability gain by using polymers is preferably below the permeability upper limit line indicated on FIGS 1-2. Percent permeability gains over the permeability upper limit line indicate over-flocculation of cellulosic fibers, which leads to larger flocs and causes poor sheet formation.
  • Turbidity testing was performed on the filtrates from DDA screening as an indication of retention. Turbidity of treated filtrates was performed using a Hach 2100Q turbidimeter.
  • the Model 2100Q Portable Turbidimeter operates on the nephelometric principle of turbidity measurement.
  • the optical system includes a tungsten-filament lamp, a 90° detector to monitor scattered light and a transmitted light detector.
  • the instrument's microprocessor calculates the ratio of the signals from the 90° and transmitted light detectors, which corrects for interferences from color and/or light-absorbing materials.
  • the instrument range is 0 to 1000 NTU.
  • a lower turbidity level generally trends with an increase in retention of filler, fines, and/or contaminants in the furnish in the fiber mat.
  • CSF Canadian Standard Freeness Tester
  • Chemical additives shown in Table 1 were evaluated as retention and drainage aids in Examples 2-4 and include polyvinylamines (PVAml-3) and a quick inversion cationic emulsion polyacrylamide (QIC-EPAM) comprising cationic [2- (Acryloyloxy)ethyl]trimethylammonium chloride monomers (Q9) and acrylamide monomers. Where indicated, conventional additives (e.g., DPAM and bentonite) were also added to the fiber stocks.
  • PVAml-3 polyvinylamines
  • QIC-EPAM quick inversion cationic emulsion polyacrylamide
  • conventional additives e.g., DPAM and bentonite
  • Table 1 Chemical additives tested as retention and drainage aids in Examples 2-4.
  • NVF N-vinylformamide
  • PNVF poly-N-vinylformamide
  • Example 2 Evaluation of QIC-EPAM with PVAms as retention and drainage aids for improving DDA drainage and permeability in recycled OCC furnish
  • Polyvinylamines (PVAms 1-3) and quick inversion cationic EPAM (QIC-EPAM) were evaluated alone and in combination as retention and drainage aids for recycled linerboard prepared from 100% recycled old corrugated cardboard (OCC) and wastepaper fiber stock from a North American paper plant.
  • the OCC fiber stock was diluted to form a thin stock with a consistency of 0.5-0.7% by wt (Total Suspended solids, TSS). Preparation of sheets, determination of DDA drainage time, and determination of DDA permeability was performed according to Example 1. [0302] PVAml was evaluated alone at dosages ranging from 2-10 kg/t. PVAm2 was evaluated alone at dosages ranging from 2-12 kg/t. PVAm3 was evaluated alone at dosages ranging from 0.2-1 kg/t. For these experiments, PVAms were added directly to the thin stock.
  • Results are shown in FIG 1.
  • higher DDA Drainage % Gain above the drainage lower limit line indicated on FIG 1 was preferred.
  • the percentage of sheet permeability gain below the permeability upper limit line indicated on FIG 1 was preferred.
  • Percent permeability gains over the limit line indicate over-flocculation of cellulosic fibers, which leads to larger flocs and causes poor sheet formation.
  • Permeability is a property of porous materials that is an indication of the ability for fluids (gas or liquid) to flow through them. Fluids can more easily flow through a material with high permeability than one with low permeability.
  • the permeability of a medium is related to the porosity, but also to the shapes of the pores in the medium and their level of connectedness. Increased fiber pad permeability was caused by chemical flocculation of fibers.
  • inventive retention and drainage aids e.g., PVAm with QIC-EPAM
  • significantly improve the drainage i.e., shorter drainage times, with drainage gains above lower limit
  • over-permeabilizing i.e., permeability gains at or below upper limit
  • inventive retention and drainage aids improved drainage in a dose dependent manner as the QIC- EPAM dosage increased.
  • inventive retention and drainage aids e.g., PVAm with QIC-EPAM
  • inventive retention and drainage aids allowed for a significant reduction of PVAm dosage, while providing improved DDA drainage without over-permeabilizing the liner sheets.
  • a 20-40% PVAm dosage reduction was observed on the customer paper machines by using 0.1-0.2 Kg/ton of QIC-EPAM.
  • QIC-EPAM + PVAml which allowed for reduction of PVAml from 8-10 kg/t to 6 kg/t.
  • the greatest enhancement was observed with QIC-EPAM + PVAm3 using 0.6 kg/t of PVAm3.
  • the QIC-EPAM is a cationic quaternary co-polyacrylamide having a standard viscosity (SV) of 2.5-3.5 cPs and 20-30 mol% Q9 cationic monomer content.
  • SV standard viscosity
  • the molecular weight of QIC-EPAM is suitable to improve retention, drainage and fixation without damaging sheet formations at elevated polymer dosage levels.
  • inventive retention and drainage aids e.g., QIC-EPAM + PVAm
  • inventive retention and drainage aids provide enhancements in drainage over PVAm alone without overflocculating.
  • Addition of QIC-EPAM + PVAm to recycled fiber stock provides faster drainage, reduction in dryer steam usage, improved liner quality (i.e., uniformity and permeability), and significant reduction in overall PVAm dosage in an industrial setting.
  • Example 3 Evaluation of QIC-EPAM with PVAms as retention and drainage aids (comixed vs. separate addition) for improving DDA drainage and retention in recycled OCC furnish
  • PVAms 1-3 and QIC-EPAM were evaluated as retention and drainage aids for recycled linerboard prepared from 100% recycled old corrugated cardboard (OCC) fiber stock from a North American paper plant.
  • the OCC fiber stock was diluted to form a thin stock with a consistency of 0.5-0.7% by wt (Total Suspended solids, TSS).
  • Recycled liners were prepared and evaluated for DDA drainage time and the resulting DDA filtrates were evaluated for turbidity according to Example 1.
  • PVAms 1-3 were evaluated alone at 6 kg/t for PVAm 1-2 and 0.6 kg.t for PVAm3. For these experiments, PVAms were added directly to the thin stock.
  • Results are shown in FIG 2. For the present example, lower turbidity is preferred and is an indication of better fiber retention.
  • inventive retention and drainage aids e.g., PVAm + QIC-EPAM
  • inventive retention and drainage aids significantly improved both drainage time and fiber retention when co-mixed prior to addition and when added separately.
  • all co-mixed experiments provided drainage gains above the lower limit line.
  • the best results were achieved by combining QIC- EPAM and PVAml. This combination achieved the highest DDA drainage gain and lowest turbidity for both co-mixed and separate addition experiments.
  • inventive retention and drainage aids e.g., QIC-EPAM + PVAm
  • inventive retention and drainage aids can be co-mixed or added separately to the stock to improve both drainage and retention (i.e., shorter drainage time and lower turbidity) of liners made from 100% recycled furnish.
  • Addition of QIC-EPAM + PVAm to recycled fiber stock provides faster drainage, reduction in dryer steam usage, and significant improvements in fiber retention in an industrial setting.
  • PVAm3 and QIC-EPAM were evaluated as retention and drainage aids along with conventional additives (DPAM and bentonite) for recycled linerboard prepared from 100% recycled old corrugated cardboard (OCC) fiber stock from a North American paper plant.
  • the OCC fiber stock was diluted to form a thin stock with a consistency of 0.5-0.7% by wt (Total Suspended solids, TSS).
  • Recycled liners were prepared and evaluated for DDA drainage time and gravimetric water retention (CSF) according to Example 1.
  • PVAm3 was evaluated at increasing dosages (e.g., 0.5 kg/t, 0.8 kg/t, and 1 kg/t) along with DPAM and bentonite.
  • QIC-EPAM (0.25 kg/t and 0.5 kg/t) was evaluated alone and in combination with PVAm3 (0.5 kg/t and 0.8 kg/t).
  • results from FIG 3 indicate that addition of QIC-EPAM significantly improved the gravimetric drainage of PVAm3.
  • CSF is a measure of water drainage rates from fibers and is often used to characterize the degree of fiber fibrillation in pulp and paper science. The freeness of a stock is generally related to the surface conditions and swelling of the fibers (TAPPI 1999b). In this study, higher gravimetric drainage rates (i.e., higher CSF) is preferred and indicates that the added retention polymers positively affect the fiber surface conditions and swelling of the fibers.
  • inventive retention and drainage aids e.g., PVAm with QIC-EPAM
  • the inventive retention and drainage aids allowed for a significant reduction of PVAm3 dosage by 50% from 1 kg/t to 0.5 kg/t while achieving better results with the same overall retention aid dosage (i.e., 1 kg/t total).
  • Similar enhancements to DDA drainage time can be seen in FIG 4, where the addition of QIC-EPAM allowed for a 20-50% reduction in PVAm3, while achieving similar or better DDA drainage results.
  • Rationale for enhanced performance of QIC-EPAM + PVAm3 can be found in Example 2.
  • inventive retention and drainage aids e.g., QIC-EPAM + PVAm3
  • conventional additives e.g., bentonite and DPAM

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Abstract

La présente invention concerne de manière générale des procédés et des compositions permettant de fabriquer du tissu, du papier ou du carton et d'en améliorer la rétention et l'égouttage. En particulier, la divulgation concerne des procédés permettant d'améliorer la rétention et l'égouttage par ajout d'un adjuvant de rétention et d'égouttage comprenant des polyacrylamides en émulsion cationique à inversion rapide (QIC-EPAM) et des polymères de polyvinylamine (PVAm). La préparation de feuilles de papier dans ces conditions assure une rétention améliorée, des taux d'égouttage gravimétriques et un temps d'égouttage DDA, sans surfloculation et permettant une diminution significative du dosage de PVAm.
PCT/US2024/048491 2023-09-27 2024-09-26 Utilisation de polymères en émulsion cationique à inversion rapide avec des polyvinylamines en tant qu'adjuvants de rétention et d'égouttage Pending WO2025072390A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6132558A (en) * 1996-07-09 2000-10-17 Basf Aktiengesellschaft Process for producing paper and cardboard
US20130299109A1 (en) * 2010-10-01 2013-11-14 Matti Hietaniemi Method for improving papermaking or board making process, use of a polysaccharide and paper
US20180327974A1 (en) * 2016-09-30 2018-11-15 Kemira Oyj Process for making paper, paperboard or the like
WO2021001602A1 (fr) * 2019-07-01 2021-01-07 Kemira Oyj Procédé de fabrication de papier ou de carton et papier ou carton obtenu par le procédé, et utilisation d'un polymère d'émulsion cationique dans la fabrication de papier ou de carton
US20230116374A1 (en) * 2021-10-12 2023-04-13 Kemira Oyj Starch fixation and retention in recycled fiber systems
WO2024145469A1 (fr) * 2022-12-28 2024-07-04 Kemira Oyj Terpolymères en émulsion amphotères solubles dans l'eau, procédés de fabrication et procédés d'utilisation comme auxiliaires de rétention et de déshydratation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6132558A (en) * 1996-07-09 2000-10-17 Basf Aktiengesellschaft Process for producing paper and cardboard
US20130299109A1 (en) * 2010-10-01 2013-11-14 Matti Hietaniemi Method for improving papermaking or board making process, use of a polysaccharide and paper
US20180327974A1 (en) * 2016-09-30 2018-11-15 Kemira Oyj Process for making paper, paperboard or the like
WO2021001602A1 (fr) * 2019-07-01 2021-01-07 Kemira Oyj Procédé de fabrication de papier ou de carton et papier ou carton obtenu par le procédé, et utilisation d'un polymère d'émulsion cationique dans la fabrication de papier ou de carton
US20230116374A1 (en) * 2021-10-12 2023-04-13 Kemira Oyj Starch fixation and retention in recycled fiber systems
WO2024145469A1 (fr) * 2022-12-28 2024-07-04 Kemira Oyj Terpolymères en émulsion amphotères solubles dans l'eau, procédés de fabrication et procédés d'utilisation comme auxiliaires de rétention et de déshydratation

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