EP4323586A1 - Procede de fabrication de papier et de carton - Google Patents

Procede de fabrication de papier et de carton

Info

Publication number
EP4323586A1
EP4323586A1 EP22723053.9A EP22723053A EP4323586A1 EP 4323586 A1 EP4323586 A1 EP 4323586A1 EP 22723053 A EP22723053 A EP 22723053A EP 4323586 A1 EP4323586 A1 EP 4323586A1
Authority
EP
European Patent Office
Prior art keywords
polymer
water
reaction
weight
aqueous solution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22723053.9A
Other languages
German (de)
English (en)
French (fr)
Inventor
Cyril BARRIERE
Gatien Faucher
Bastien MARTEL
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SNF Group
Original Assignee
SNF Group
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SNF Group filed Critical SNF Group
Publication of EP4323586A1 publication Critical patent/EP4323586A1/fr
Pending legal-status Critical Current

Links

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
    • 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
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • D21H17/375—Poly(meth)acrylamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F120/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F120/52—Amides or imides
    • C08F120/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C08F120/56—Acrylamide; Methacrylamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/04—Polymerisation in solution
    • C08F2/10—Aqueous solvent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/06—Oxidation
    • 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
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
    • D21H17/45—Nitrogen-containing groups
    • 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
    • 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
    • D21H21/14—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 characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2810/00—Chemical modification of a polymer

Definitions

  • the present invention relates to a process for the manufacture of paper or board having improved drainage and runnability properties. More specifically, the subject of the invention is a process involving the reaction of a water-soluble polymer in the form of an inverse emulsion in a mixture of alkaline hydroxide and/or alkaline-earth hydroxide and hypo- alkali halide and/or alkaline-earth hypo-halide and then injecting it directly into the fibrous suspension used to manufacture the paper or cardboard.
  • the present invention also relates to the papers and cardboards with improved physical properties obtained by this process.
  • the drainage properties relate to the ability of the fibrous mat to evacuate or drain the maximum amount of water before drying. Improved drainage properties mean energy savings and increased production capacity.
  • Runnability refers to the optimization of the operation of the paper machine by increasing productivity through better drainage on the table, better dryness in the press section, a reduction in breakages through greater cleanliness of the circuits and a reduction deposits.
  • JP 2002-212898 describes the use of a polymer resulting from the Hofmann degradation reaction in a papermaking process. This document does not describe, during a chemical reaction, the addition of a polymer in the form of an inverse emulsion.
  • WO 2020/094960 describes inverse emulsion compositions.
  • EP 2 840 100 the functionalization of a polymer.
  • Polyvinylamines are known to improve drainage during paper formation.
  • Polyvinylamines can be obtained by reacting a solution of polyacrylamide in a mixture of alkali hydroxide and/or alkaline earth hydroxide and alkali hypohalide and/or hypohalide of alkaline earth metal followed by treatment in an acid medium.
  • this reaction on polyacrylamide requires heating the reaction medium and also a need for an exchanger to regulate its temperature at the end of the reaction.
  • This method also makes it possible to avoid all the logistics (transport or installation of a dissolution unit) inherent in the handling of solutions of water-soluble polymers.
  • the process is all the more simple as from the addition of the polymer in the form of an inverse emulsion in the mixture of hydroxide and hypo-halide of alkaline and / or alkaline-earth metal the reaction medium is homogeneous and it is not necessary to heat the reaction medium or to use heat exchangers.
  • alkaline denotes an alkali metal, advantageously lithium, sodium or potassium.
  • alkali hydroxide designates a hydroxide (OH ) of at least one alkali metal, for example NaOH, KOH or NaOH+KOH. The same is true for alkaline earth hydroxide.
  • alkaline-earth is meant an alkaline-earth metal, advantageously calcium or magnesium.
  • a hypo-halide is an oxyanion, for example hypochlorite CIO.
  • alkaline hypo-halide means a hypo-halide of at least one alkali metal and at least one hypo-halide, for example NaOCl, KOBr or NaOCl+KOBr. The same is true for the alkaline-earth hypo-halide.
  • the process of the invention makes it possible to increase the range of drainage agents and current dry strength compared to a similar process using polyacrylamides in the form of an aqueous solution.
  • the invention relates to a process for manufacturing a sheet of paper or cardboard from a fibrous suspension, comprising the following steps: a) injection of a polymer P2 into a fibrous suspension (advantageously a suspension of cellulosic fibers), b) forming a sheet of paper or cardboard, c) drying the sheet of paper or cardboard, the polymer P2 being prepared, prior to step a), from a water-soluble polymer PI in the form of an inverse emulsion, PI being a water-soluble polymer of at least one nonionic monomer chosen from acrylamide, methacrylamide, N,N-dimethylacrylamide, and acrylonitrile, the polymer P2 being obtained by a reaction Re consisting in adding the water-soluble polymer PI in the form of an inverse emulsion in an aqueous solution M1 of: (i) a an alkali metal hydroxide, or an alkaline earth metal hydroxide, or mixtures thereof (ii) an al
  • step a) is carried out within a period not exceeding 24 hours from the start of the Re reaction, that is to say from the addition of the water-soluble polymer PI in the form of inverse emulsion in aqueous solution M1.
  • the dry matter corresponds to the dry extract obtained after evaporation of the water from the fibrous suspension used in a process for manufacturing a sheet of paper or cardboard.
  • the dry matter is generally based on cellulosic fibers and fillers, advantageously consisting of cellulosic fibers and fillers.
  • the term "cellulosic fibers" encompasses any cellulosic entity, including fibers, fines, microfibrils or nanofibrils.
  • fibrous suspension we mean the thick paste or the thin paste which is based on water and cellulosic fibers.
  • the thick stock (Thick Stock), having a mass concentration of dry matter generally greater than 1%, or even greater than 3%, is upstream of the mixing pump (fan-pump).
  • the dilute paste (Thin Stock), having a mass concentration of dry matter generally less than 1%, is located downstream of the mixing pump.
  • polymer designates both homopolymers and copolymers of at least two distinct monomers.
  • An amphoteric polymer is a polymer comprising cationic charges and anionic charges, preferably as many anionic charges as cationic charges.
  • water-soluble polymer means a polymer which yields an aqueous solution without insoluble particles when dissolved with stirring for 4 hours at 25°C and with a concentration of 20 gL 1 in deionized water .
  • the water-soluble polymer PI is a polymer of at least one nonionic monomer chosen from acrylamide, methacrylamide, N,N-dimethylacrylamide, and acrylonitrile.
  • the polymer PI contains at least 50 mol% of at least one of these nonionic monomers.
  • the polymer PI can also contain anionic and/or cationic and/or zwitterionic monomers.
  • Polymer PI is advantageously devoid of nonionic monomer which is not chosen from acrylamide, methacrylamide, N,N-dimethylacrylamide, and acrylonitrile.
  • the anionic monomers are preferably chosen from the group comprising monomers having a carboxylic acid function and their salts including acrylic acid, methacrylic acid, itaconic acid, maleic acid, monomers having a sulphonic acid function and their salts; including acrylamido tert-butyl sulfonic acid (ATBS), allyl sulfonic acid and methallyl sulfonic acid, and their salts, and monomers having a phosphonic acid function and their salts.
  • monomers having a carboxylic acid function and their salts including acrylic acid, methacrylic acid, itaconic acid, maleic acid, monomers having a sulphonic acid function and their salts; including acrylamido tert-butyl sulfonic acid (ATBS), allyl sulfonic acid and methallyl sulfonic acid, and their salts, and monomers having a phosphonic acid function and their salts.
  • ATBS acrylamid
  • the anionic monomers of the polymer PI have as counterion an alkali metal, an alkaline-earth metal or an ammonium (preferably a quaternary ammonium).
  • the cationic monomers are preferably chosen from the group comprising quaternized or salified dimethylaminoethyl acrylate (AD AME), quaternized or salified dimethylaminoethyl methacrylate (MADAME), diallyldimethylammonium chloride (DADMAC), acrylamidopropyltrimethylammonium chloride (APTAC) , and methacrylamidopropyltrimethylammonium chloride (MAPTAC).
  • AD AME quaternized or salified dimethylaminoethyl acrylate
  • MADAME quaternized or salified dimethylaminoethyl methacrylate
  • DDADMAC diallyldimethylammonium chloride
  • ATAC acrylamidopropyltrimethylammonium chloride
  • MATAC methacrylamidopropyltrimethylammonium chloride
  • the cationic monomers of the polymer PI have as counterion a halide, preferably a chloride ion.
  • the zwitterionic monomers are preferably chosen from the group comprising sulfobetaine monomers such as sulfopropyl dimethylammonium ethyl methacrylate, sulfopropyl dimethylammonium propyl methacrylamide, or sulfopropyl 2-vinylpyridinium; phosphobetaine monomers, such as phosphato ethyltrimethylammonium ethyl methacrylate; and carboxybetaine monomers.
  • the water-soluble polymer PI is a homopolymer or a copolymer of acrylamide or of methacrylamide.
  • the PI polymer can be linear, structured or cross-linked.
  • the crosslinking agents allowing the structuring can in particular be chosen from sodium allyl sulfonate, sodium methallyl sulfonate, sodium methallyl disulfonate, methylenebisacrylamide, triallylamine, triallylammonium chloride.
  • the structuring of the polymer PI can also be obtained with at least one polyfunctional compound containing at least 3 heteroatoms chosen from N, S, O, P and each having at least one mobile hydrogen.
  • This polyfunctional compound can in particular be a polyethyleneimine or a polyamine.
  • the reaction Re is carried out by adding an inverse emulsion of water-soluble polymer PI to the aqueous solution Ml.
  • the inverse emulsion (water-in-oil emulsion) comprises:
  • An aqueous phase comprising at least the polymer PI
  • At least one emulsifying agent and at least one reversing agent At least one emulsifying agent and at least one reversing agent.
  • the oily phase can be a mineral oil, a vegetable oil, a synthetic oil or a mixture of several of these oils.
  • mineral oil examples include mineral oils containing saturated hydrocarbons of the aliphatic, naphthenic, paraffinic, isoparaffinic, cycloparaffinic or naphthyl type.
  • Examples of synthetic oil are hydrogenated polydecene or hydrogenated polyisobutene, an ester such as octyl stearate or butyl oleate.
  • Exxon's Exxsol® product line is a perfect fit.
  • the weight ratio of water phase to oil phase in the invert emulsion is preferably 50/50 to 90/10. This ratio includes the weight of the various constituents of the emulsion, in particular the water-soluble polymer PI.
  • the water-in-oil emulsion preferably comprises from 15 to 40% by weight of oil, from 20 to 55% by weight of water, from 15 and 50% by weight of polymer PI, the percentages being expressed relative to the total weight of the inverse emulsion of the polymer PI.
  • emulsifying agent designates an agent capable of emulsifying water in an oil
  • an “inverting agent” is an agent capable of emulsifying an oil in water. More specifically, it is considered that a reversing agent is a surfactant having an HLB greater than or equal to 10, and that an emulsifying agent is a surfactant having an HLB strictly less than 10.
  • the hydrophilic-lipophilic balance (HLB) of a chemical compound is a measure of its degree of hydrophilicity or lipophilicity, determined by calculating the values of different regions of the molecule, as described by Griffin in 1949 (Griffin WC, Classification of Surface-Active Agents by HLB, Journal of the Society of Cosmetic Chemists, 1949, 1, pages 311-326).
  • Griffin's method based on calculating a value based on the chemical groups of the molecule.
  • Griffin assigned a dimensionless number between 0 and 20 to give information about water and oil solubility.
  • Substances with an HLB value of 10 are distributed between the two phases, so that the hydrophilic group (molecular mass Mh) projects completely into the water while the hydrophobic hydrocarbon group (molecular mass Mp) is adsorbed in the non-phase. watery.
  • HLB 20 (Mh/M).
  • the inverse emulsion containing the polymer PI advantageously contains from 0.1% to 10% by weight of at least one emulsifying agent, the percentages being expressed by weight relative to the weight of the emulsion.
  • This emulsifying agent is advantageously chosen from sorbitan esters, polyethoxylated sorbitan esters, polyethoxylated fatty acids, polyethoxylated fatty alcohols, polyesters having an average molecular weight of between 1000 and 3000 daltons resulting from the condensation between a poly( isobutenyl) succinic or its anhydride and a polyethylene glycol, block copolymers with an average molecular weight of between 2500 and 3500 daltons resulting from the condensation between hydroxystearic acid and a polyethylene glycol, ethoxylated fatty amines, derivatives of di-alkanol amides , copolymers of stearyl methacrylate, and mixtures of these emulsifying agents.
  • the inverse emulsion containing the polymer PI advantageously contains between 0.1 and 10% by weight of at least one inverting agent, the percentages being expressed by weight relative to the weight of the emulsion.
  • This reversing agent is advantageously chosen from ethoxylated nonylphenols, preferably having 4 to 10 ethoxylations; ethoxylated/propoxylated alcohols preferably having an ethoxylation/propoxylation comprising between 12 and 25 carbon atoms; ethoxylated tridecyl alcohols; polyethoxylated fatty acids; poly(ethoxylated/propoxylated) fatty alcohols; ethoxylated sorbitan esters; polyethoxylated sorbitan laurate; polyethoxylated castor oil; heptaoxyethyl lauryl alcohol; polyethoxylated sorbitan monostearate; polyethoxylated alkyl phenol cetyl ether; poly ethylene
  • the water-in-oil emulsion according to the invention can be prepared according to any method known to those skilled in the art. Generally, an aqueous solution comprising the monomer(s) and the emulsifying agent(s) is emulsified in an oily phase. Then, the polymerization is carried out by adding a free radical initiator.
  • a free radical initiator We can refer to redox couples, with cumene hydroperoxide, tertiary butylhydroxyperoxide or persulfates among the oxidizing agents, sodium sulfite, sodium metabisulfite and Mohr's salt among the reducing agents.
  • Azo compounds such as 2,2'-azobis (isobutyronitrile) and 2,2'-azobis (2-amidinopropane) hydrochloride can also be used.
  • the polymerization is generally carried out in an isothermal, adiabatic or temperature-controlled manner.
  • the temperature is advantageously kept constant, generally between 10 and 60°C (isothermal), or else the temperature is allowed to increase naturally (adiabatic) and in this case, the reaction is generally started at a temperature below 10°C and the final temperature is usually greater than 50°C or, finally, the increase in temperature is controlled so as to have a temperature curve between the isothermal curve and the adiabatic curve.
  • the reversing agent(s) are added at the end of the polymerization reaction, preferably at a temperature below 50°C.
  • Reaction Re consists of adding the inverse polymer emulsion PI to an aqueous solution M1 of: (i) an alkaline hydroxide and/or an alkaline-earth hydroxide, (ii) an alkaline hypo-halide and/or an alkaline earth hypo-halide, with a reaction time Re of 10 seconds to 5 hours to form the polymer P2.
  • the aqueous solution M1 is an aqueous solution of soda (sodium hydroxide) and sodium hypochlorite.
  • reaction time of the polymer PI in the aqueous solution M1 of hypohalide and hydroxide is from 10 seconds to 180 minutes.
  • the Re reaction is advantageously carried out at a temperature comprised between 10 and 30°C, more advantageously between 15 and 25°C.
  • reaction Re preferably between 0.1 and 20% by weight of polymer PI, relative to the weight of the aqueous solution Ml, more preferably between 0.3 and 10% and even more preferably between 0.5 and 3.0 % by weight, are added to the aqueous solution M1.
  • the polymer P2 can be functionalized with a compound comprising at least one aldehyde function to give a polymer P3, for example by adding a compound comprising at least an aldehyde function.
  • the compound comprising at least one aldehyde function is glyoxal.
  • the pH of the reaction mixture resulting from the reaction Re and containing the polymer P2 can be adjusted by adding acid between 0.5 and 7.5, more preferably between 1.0 and 3, 0. A person skilled in the art knows how to adjust the pH of this type of reaction medium. The adjustment of the pH is advantageously carried out in the absence of formation of the polymer P3.
  • the polymer P2 (or P3) is introduced into the white waters and/or the thick paste and/or the mixture formed by the white waters and the thick paste after homogenization of the fibrous suspension in the pump of dilution (fan-pump).
  • the polymer P2 (or P3) can also be introduced into the papermaking process at the level of the forming table, for example by spraying or application in the form of a foam, or even at the level of the size press (coater)
  • the fibrous suspension encompasses the possible use of different cellulosic fibers: virgin fibers, recycled fibers, chemical pulp, mechanical pulp, micro-fibrillated cellulose or nano-fibrillated cellulose.
  • the fibrous suspension also encompasses the use of these different cellulosic fibers with all types of fillers such as TiCh, C aCC ⁇ (ground or precipitated), kaolin, organic fillers and mixtures thereof.
  • Polymer P2 or P3 can be used within the papermaking process in combination with other products such as inorganic or organic coagulants, dry strength agents, wet strength agents, natural polymers such as starches or carboxymethylcellulose (CMC), inorganic microparticles such as bentonite microparticles and colloidal silica microparticles, organic polymers of any ionic nature (nonionic, cationic, anionic, or amphoteric) and which may be (without being limiting) linear, branched, cross-linked, hydrophobic, or associative.
  • CMC carboxymethylcellulose
  • organic polymers of any ionic nature nonionic, cationic, anionic, or amphoteric
  • Recycled fiber pulp Wet pulp is obtained by disintegrating dry pulp to obtain a final aqueous concentration of 1% by weight. It is a pH-neutral pulp made from 100% recycled cardboard fibres. bl Evaluation of drainage performance (PDA!
  • the DDA (“Dynamic Drainage Analyzer”) makes it possible to automatically determine the time (in seconds) required to drain under vacuum a fibrous suspension deposited on a cloth.
  • the polymers are added to the wet paste (0.6 liters of paste at 1.0% by weight) in the cylinder of the DDA with stirring at 1000 revolutions per minute:
  • the necessary quantity of paste is removed so as to obtain a sheet having a basis weight of 90 gm 2 .
  • the wet paste is introduced into the vat of the dynamic molder and is kept under agitation.
  • the different components of the system are injected into this paste according to the predefined sequence.
  • a contact time of 30 to 45 seconds is generally respected between each addition of polymer.
  • Formettes of paper are produced with an automatic dynamic former: a blotter and the forming fabric are placed in the bowl of the dynamic former before starting the rotation of the bowl at 1000 rpm and building the water wall.
  • the treated pulp is spread over the water wall to form the fibrous mat on the forming fabric.
  • the fibrous mat is recovered, pressed under a press delivering 4 bar, then dried at 117°C.
  • the sheet obtained is conditioned overnight in a room with controlled humidity and temperature (50% relative humidity and 23°C). The dry strength properties of all the sheets obtained by this procedure are then measured.
  • the burst (Burst Index) is measured with a Messmer Buchel M 405 burst tester according to the TAPPI T403 om-02 standard. The result is expressed in kPa or in percentage compared to a reference.
  • the bursting index expressed in kPa.m 2 /g, is determined by dividing this value by the basis weight of the sheet tested.
  • the dry breaking length is measured in the machine direction (DBL SM) and in the transverse direction (DBL ST) with a Testometric AX tensile device according to TAPPI T494 om-01. The result is expressed in km or in percentage compared to a reference.
  • 310 g of water are introduced into a 1 liter reactor equipped with a mechanical stirrer, a thermometer, a condenser and a gaseous nitrogen plunger.
  • the pH of the reaction medium is adjusted to 3.3 using a pH buffer (NaOH 30% by weight in water and H 3 PO 4 75% by weight in water).
  • the medium is heated and maintained at a temperature of between 79 and 81° C. using a water bath.
  • 400 g of 50% acrylamide, 237.8 g of water and 2.40 g of 100% sodium hypophosphite are incorporated (cast 1) for 180 minutes. Pour 2, 0.48 g of 100% sodium persulfate and 48 g of water for 180 minutes.
  • the polymer solution is maintained at 80° C. for 120 minutes after the end of the casting.
  • the solution of polymer P1-A obtained has a pH of 5.7, a concentration by weight of polymer P1-A of 20% and a viscosity of 6000 cps.
  • Pl-B polymer Acrylamide homopolymer in the form of an inverse emulsion marketed by SNF under the name: FlopamTMEM 230.
  • Polymers Pl-A (in aqueous solution) and Pl-B (invert emulsion) are acrylamide homopolymers which are distinguished only by their physical form.
  • An aqueous solution of sodium hypochlorite 14.29 g (NaOCl) at 14.6% (by weight in water) and 7.5 g of sodium hydroxide at 30% (by weight in water) is prepared by function of the alpha (0.5) and beta (2.0) coefficients for the Re reaction.
  • Pl-A polymer solution is at 50°C
  • the aqueous solution of sodium hypochlorite and sodium hydroxide is added to Pl -HAS.
  • 138.20 g of water is added.
  • a solution of polymer P2-A is obtained at a concentration of 2% by weight.
  • An aqueous solution M1 of 3.66 g of sodium hypochlorite (NaOCl) at 14.6% (by weight in water) and 1.92 g of sodium hydroxide at 30% (by weight in water) is prepared according to the coefficients alpha (0.5) and beta (2.0) for the Re reaction. 93.60 g of water are then added.
  • PDA Drip performance
  • Table 1 Drainage according to the polymer. An improvement in drainage is observed with the use of polymer P2-B compared to polymer P2-A.
  • Table 2 Dry strength depending on the polymer. Burst performance is improved by using the P2-B polymer. The same trend is observed for the breaking length measurement in the forward direction (DBL SM) and in the cross direction (DBL ST).

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Paper (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
EP22723053.9A 2021-04-15 2022-04-13 Procede de fabrication de papier et de carton Pending EP4323586A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2103912A FR3121942A1 (fr) 2021-04-15 2021-04-15 Procede de fabrication de papier et de carton
PCT/EP2022/059954 WO2022219086A1 (fr) 2021-04-15 2022-04-13 Procede de fabrication de papier et de carton

Publications (1)

Publication Number Publication Date
EP4323586A1 true EP4323586A1 (fr) 2024-02-21

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Country Status (7)

Country Link
US (1) US20240200270A1 (zh)
EP (1) EP4323586A1 (zh)
CN (1) CN117203392A (zh)
AU (1) AU2022256771A1 (zh)
BR (1) BR112023021202A2 (zh)
FR (1) FR3121942A1 (zh)
WO (1) WO2022219086A1 (zh)

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FR2880901B1 (fr) * 2005-01-17 2008-06-20 Snf Sas Soc Par Actions Simpli Procede de fabrication de papier et carton de grande resistance a sec et papiers et cartons ainsi obtenus
JP2009150009A (ja) * 2007-12-20 2009-07-09 Hymo Corp 製紙用内添剤およびその使用方法
FR3009830B1 (fr) * 2013-08-22 2015-08-14 Snf Sas Nouveaux complexes de polymeres hydrosolubles et leurs utilisations
FR3088068B1 (fr) * 2018-11-06 2020-11-06 S N F Sa Emulsion inverse polymerique auto inversible
FR3096985B1 (fr) * 2019-06-05 2021-05-14 S N F Sa Procede de preparation de polymeres structures sous forme de poudre par voie gel

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BR112023021202A2 (pt) 2023-12-19
FR3121942A1 (fr) 2022-10-21
AU2022256771A1 (en) 2023-10-26
CN117203392A (zh) 2023-12-08
WO2022219086A1 (fr) 2022-10-20

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