EP4189162A1 - Verfahren zur herstellung von papier und karton - Google Patents

Verfahren zur herstellung von papier und karton

Info

Publication number
EP4189162A1
EP4189162A1 EP21743222.8A EP21743222A EP4189162A1 EP 4189162 A1 EP4189162 A1 EP 4189162A1 EP 21743222 A EP21743222 A EP 21743222A EP 4189162 A1 EP4189162 A1 EP 4189162A1
Authority
EP
European Patent Office
Prior art keywords
polymer
weight
oily suspension
water
anhydrous
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.)
Granted
Application number
EP21743222.8A
Other languages
English (en)
French (fr)
Other versions
EP4189162C0 (de
EP4189162B1 (de
Inventor
Gatien Faucher
Damien FOUGEROUSE
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
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Filing date
Publication date
Application filed by SNF Group filed Critical SNF Group
Publication of EP4189162A1 publication Critical patent/EP4189162A1/de
Application granted granted Critical
Publication of EP4189162C0 publication Critical patent/EP4189162C0/de
Publication of EP4189162B1 publication Critical patent/EP4189162B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • 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
    • 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
    • D21H17/42—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups anionic
    • D21H17/43—Carboxyl groups or derivatives thereof
    • 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
    • D21H17/455—Nitrogen-containing groups comprising tertiary amine or being at least partially quaternised
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/66—Salts, e.g. alums
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates
    • 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
    • D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
    • D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic material
    • 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
    • D21H21/50—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 form
    • D21H21/52—Additives of definite length or shape
    • 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
    • D21H23/06—Controlling the addition

Definitions

  • the present invention relates to a process for the manufacture of paper and cardboard having improved total retention, filler retention and drainage properties, and/or superior mechanical characteristics of paper/cardboard. More specifically, the subject of the invention is a manufacturing process involving the prior preparation of a stock solution of at least one water-soluble polymer with specific dissolution properties before its addition to the fibrous suspension.
  • the present invention also relates to the papers and cardboards obtained by this process.
  • retention properties we mean the ability to retain the materials in suspension of the paper pulp (fibers, fillers (calcium carbonate, titanium oxide, etc.), etc. on the forming fabric, therefore in the fibrous mat which will constitute the final sheet.
  • the mode of action of retention agents is based on the flocculation of these materials in suspension in water. Indeed, the flocs formed are more easily retained on the forming fabric.
  • the retention of charges consists in specifically retaining the charges (mineral species of small size presenting little affinity with cellulose).
  • the significant improvement in filler retention leads to a clarification of white water by retaining the fillers in the sheet of paper as well as increasing its weight. This also gives the possibility of substituting part of the fibers (the most expensive component in the composition of the paper) by fillers (lower costs) to reduce the costs of manufacturing the paper.
  • the drainage (or drainage) properties this is the capacity of the fibrous mat to evacuate or drain the maximum amount of water so that the sheet dries as quickly as possible, in particular during its manufacture.
  • All the retention and drainage systems known in the prior art are characterized by the fact that their main retention agent is water-soluble polymers of high molecular weight, greater than 1 million g/mol, generally greater than 3 million g/mol, called flocculants. They are generally cationic and have the particularity, due to their high molecular weight, of being able to take the form of an emulsion (inverse), an oily suspension (distilled inverse emulsion), a microemulsion or a powder. These polymers are generally introduced at a level of 50 to 800 g/t of dry polymer relative to the dry paper.
  • WO 2006/071175 describes a composition and its use in the manufacture of paper. This composition comprises a polymer and a hydrocarbon compound (oil, fat or wax). During papermaking, it can be added to a fiber suspension directly or after being emulsified. It is not used to form an aqueous solution before its addition to a fiber suspension. It can also be applied to the sheet of paper.
  • papermaking processes may also involve sheet strength agents, both dry and/or wet.
  • Some dry strength agents are water-soluble polymers with an average molecular weight of at least 750,000 Daltons, and may be in powder or inverse emulsion form. As a result, these products have the same drawbacks with regard to their preparation time. This is all the more true as the dosages of additives introduced into the paper pulp are of the order of 500 to 5000 g/t of dry matter (generally cellulosic fibers + fillers). The rapid dissolution of these polymers is therefore a key factor in reducing the footprint of preparation units.
  • a papermaking process using an aqueous solution A containing at least one water-soluble polymer P at a concentration by weight C of between 0.1 and 0.5% by weight makes it possible to achieve improved drainage performance, fiber and fines retention, filler retention, or mechanical characteristics of paper/cardboard compared to other product forms after two minutes or less of preparation at 25°C , which implies that the dissolution time of the polymer P is reduced.
  • the residence time of the polymer P in the unit for preparing the aqueous solution A is shorter, with a lower volume of maturation preparation tank and therefore a reduced footprint within the paper mill.
  • aqueous solution A to the fibrous suspension, at one or more injection points, form a sheet of paper or cardboard.
  • the viscometer equipped with a helical geometry works on the basis of an air bearing motor driving a geometry allowing controlled shear or controlled shear stress tests.
  • 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.
  • polymer denotes both homopolymers and copolymers.
  • water-soluble polymer denotes 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 water.
  • the "weight average molecular weight" of the water-soluble polymer is determined by measuring the intrinsic viscosity.
  • the intrinsic viscosity can be measured by methods known to those skilled in the art and can in particular be calculated from the reduced viscosity values for different concentrations by a graphical method consisting in plotting the reduced viscosity values (on the ordinate axis) by as a function of the concentrations (on the abscissa axis) and by extrapolating the curve to a zero concentration.
  • the intrinsic viscosity value is read on Y-axis or using the least squares method. Then the weight average molecular weight can be determined by the famous Mark-Houwink equation:
  • M represents the molecular weight of the polymer
  • a represents the Mark-Houwink coefficient
  • K depending on the particular polymer-solvent system
  • fibrous suspension we mean thick stock or thin stock which is water-based and contains cellulosic fibers and fillers.
  • the thick paste (Thick Stock), having a concentration by weight of dry matter greater than 1%, or even greater than 3%, is upstream of the mixing pump (“fan-pump”).
  • the diluted paste (“thin stock”), having a concentration by weight of dry matter generally less than 1%, is located downstream of the mixing pump.
  • the aqueous solution A of polymer P can also be referred to as stock solution of polymer P. Before its addition to the fibrous suspension, this solution A, filtered at 300 LHTI, shows no trace of undissolved polymer P.
  • the viscosity of solution A over time is determined, in water at 25° C., using a viscometer, preferably of the Thermo Scientific HAAKE iQ Air type equipped with a helical geometry.
  • the polymer P is obtained from at least one water-soluble monoethylenically unsaturated monomer, most often nonionic and/or anionic and/or cationic and/or zwiterrionic, preferably chosen from: at least one nonionic monomer chosen from the group comprising acrylamide, methacrylamide, N-alkylacrylamides, N-alkylmethacrylamides, N,N-dialkylacrylamides, N,N-dialkylmethacrylamides, alkoxylated esters of acrylic acid, alkoxylated esters of methacrylic acid, N-vinylpyridine, N-vinylpyrrolidone, hydroxyalkylacrylates, and hydroxyalkyl methacrylates, preferably Acrylamide, at least one anionic monomer chosen from the group comprising monomers having a carboxylic function and their salts including acrylic acid, methacrylic, itaconic acid, maleic acid; monomers having a sulphonic acid function and their salt
  • YY and/or ZZ is meant according to the invention either YY, or ZZ or YY and ZZ.
  • the water-soluble polymer P can be linear or structured.
  • structured means that the polymer can be in the form of a branched (branched) polymer, for example in the form of a comb (“comb”) or in the form of a star (“star”).
  • the water-soluble polymer P can also be structured by at least one structural agent, which can be chosen from the group comprising polyethylenically unsaturated monomers (that is to say having at least two unsaturated functions), such as for example the functions vinyl, allyl, acrylic and epoxy. Mention may be made, for example, of methylene bis acrylamide (MBA), triallyamine, tetraallylammonium chloride and 1,2-dihydroxyethylene bis-(N-acrylamide).
  • MBA methylene bis acrylamide
  • triallyamine tetraallylammonium chloride
  • 1,2-dihydroxyethylene bis-(N-acrylamide) 1,2-dihydroxyethylene bis-(N-acrylamide
  • the water-soluble polymer P can be obtained by radical polymerization according to the following polymerization techniques which are well known to those skilled in the art: gel polymerization, precipitation polymerization, inverse emulsion polymerization (optionally followed by distillation).
  • the polymerization is generally a free radical polymerization.
  • free radical polymerization we include free radical polymerization using UV, azo, redox or thermal initiators as well as controlled radical polymerization (CRP) techniques or matrix polymerization techniques.
  • CRP controlled radical polymerization
  • the polymer P Prior to the formation of the aqueous solution A, the polymer P is in the form of anhydrous oily suspension, generally obtained by suspending particles of polymer P in an oil. The absence of addition of water to the suspension guarantees the anhydrous character.
  • the polymer P is, prior to the formation of the aqueous solution A, in the form of anhydrous oily suspension containing between 20 and 60% by weight of polymer P under form of particles with an average diameter strictly less than 300 ⁇ m, advantageously between 0.1 and less than 300 ⁇ m, and even more advantageously between 1 and less than 300 ⁇ m.
  • the average diameter refers to the number average diameter of the polymer particles.
  • the oil of the anhydrous oily suspension of polymer P is chosen from mineral oils (containing saturated hydrocarbons such as paraffins, isoparaffins or cycloparaffins) and/or synthetic oils.
  • the oil can advantageously represent 40 to 80% by weight of the anhydrous oily suspension, for example 45 to 70%.
  • the anhydrous oily suspension of polymer P advantageously comprises between 20 and 60%, more advantageously between 30 and 55%, by weight of water-soluble polymer P, which is advantageously in the form of particles with a lower average diameter of between 0.1 and less than 300 pm.
  • the particles of water-soluble polymer P in the anhydrous oily suspension have an average diameter advantageously less than 300 ⁇ m, preferentially from 0.1 to less than 300 ⁇ m and more preferentially from 1 to less than 300 ⁇ m.
  • the average diameter of the particles can be determined by any method known to those skilled in the art, such as for example by binocular microscopy.
  • the anhydrous oily suspension of polymer P may contain a rheology modifying agent and/or an emulsifying agent and/or an inverting agent.
  • the percentage by weight of oil (advantageously 40 to 80%) is adjusted to reach, or not exceed, 100.
  • the anhydrous oily suspension of polymer P may consist of polymer P, oil and at least one additive chosen from a rheology modifier, an emulsifier, an inverting agent and mixtures thereof.
  • the rheology modifier is chosen from hydroxyethylcellulose, attapulgite, laponite, hectorite, montmorillonite, bentonite, fumed silicas and mixtures thereof.
  • the anhydrous oily suspension of polymer P advantageously contains between 0.05 and 5.00% by weight of rheology modifier, more advantageously between 0.05 and 1.5%, even more advantageously between 0.1 and 1.0 % by weight (relative to the weight of the anhydrous oily suspension).
  • the emulsifying agent is advantageously chosen from sorbitan esters, polyethoxylated sorbitan esters, diethoxylated oleocetyl alcohol, polyesters having an average molecular weight of between 1000 and 3000 Dalton resulting from the condensation between a poly(isobutenyl) succinic acid or its anhydride and a polyethylene glycol, block copolymers with an average molecular weight of between 2500 and 3500 Dalton resulting from the condensation between hydroxystearic acid and a polyethylene glycol, ethoxylated fatty amines, derivatives of di-alkanol amides, copolymers stearyl methacrylate, and mixtures thereof.
  • the anhydrous oily suspension of polymer P advantageously contains between 0.5 and 5.0% by weight of emulsifying agent, more advantageously between 1.0 and 2.0% by weight (based on the weight of the anhydrous oily suspension).
  • the reversing agent is advantageously chosen from ethoxylated nonylphenols, preferably having 4 to 10 ethoxylations; ethoxy and propoxylated alcohols preferably having an ethoxy/propoxylation comprising between 12 and 25 carbon atoms; ethoxylated tridecyl alcohols; ethoxy/propoxylated fatty alcohols; ethoxylated sorbitan esters (advantageously 20 molar equivalents of ethylene oxide); polyethoxylated sorbitan laurate (advantageously 20 molar equivalents of ethylene oxide); polyethoxylated castor oil (advantageously 40 molar equivalents of ethylene oxide); decaethoxylated oleodecyl alcohol; heptaoxyethyl lauryl alcohol; polyethoxylated sorbitan monostearate (advantageously 20 molar equivalents of ethylene oxide); polyethoxylated alkyl phenols (
  • the anhydrous oily suspension of polymer P advantageously contains between 0.1 and 4.0% by weight of inverting agent, advantageously between 0.2 and 2.0% by weight (relative to the weight of the anhydrous oily suspension).
  • the anhydrous oily suspension of polymer P may contain between 0.05 and 5.0% by weight of rheology modifier, between 0.5 and 5.0% by weight of emulsifying agent and between 0.1 and 4.0% by weight reversing agent.
  • the oil and any additional compounds of the anhydrous oily suspension have no effect on the development of the viscosity of the aqueous polymer solution. These compounds therefore have no effect on the factor F( C >). Their possible presence is therefore not detrimental (and not necessary) when measuring the factor F(c>).
  • the polymer P is introduced into the fibrous suspension at the rate of 100 to 5000 gt 1 of dry matter (cellulosic fibers+fillers).
  • the fibrous suspension encompasses the possible use of different fibres: virgin fibres, recycled fibres, chemical pulp, mechanical pulp, micro or nano fibrillated cellulose, with all types of fillers such as T1O2, CaCCL (crushed or precipitated), kaolin , organic fillers and mixtures thereof.
  • the water-soluble polymer P 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 (cationic, anionic, or amphoteric) and which can be (without being limiting) linear, branched, crosslinked, hydrophobic, or associative.
  • CMC carboxymethylcellulose
  • organic polymers of any ionic nature cationic, anionic, or amphoteric
  • Figure 1 shows curves of viscosity as a function of time of polymers P of different factors F( C) .
  • Figure 2 represents a curve of viscosity as a function of time of a polymer P for which the factor F( C >) is calculated.
  • Wet paste is obtained by disintegrating dry paste to obtain a final aqueous concentration of 1% by weight. It is a neutral pH pulp composed, by weight, of 90% bleached virgin long fibres, 10% bleached virgin short fibres, and 30% additional GCC (ground calcium carbonate) (Hydrocal® 55 from Omya) in relation to the weight of the fibres.
  • GCC ground calcium carbonate
  • Pulp recycled fibers are Pulp recycled fibers:
  • wet paste is obtained by disintegrating dry paste to obtain a final aqueous concentration of 1% by weight. It is a pH-neutral pulp made from 100% recycled cardboard fibres. b) Assessment of total retention and charge retention
  • the first pass retention in percentage (%LPR for "Lirst Pass Retention"), corresponding to the total retention is calculated according to the following formula:
  • the first pass ash retention percentage (%FPAR for "First Pass Ash Retention") is calculated according to the following formula:
  • %FPAR (AHB-AWW)/AHB* 100 with:
  • the paste is treated, subjected to a stirring speed of 1000 revolutions per minute.
  • T 30 s: Stop stirring and add the quantity of water necessary to obtain 1 litre.
  • This liter of paste is transferred to the “Canadian Standard Freeness Tester” and the TAPPI T227om-99 procedure is applied.
  • the DDA (“Dynamic Drainage Analyzer”) makes it possible to automatically determine the time (in seconds) required to drain a fibrous suspension under vacuum.
  • 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 in the end 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 is measured with a Messmer Buchel M 405 burst tester according to the TAPPI T403 om-02 standard. The result is expressed in kPa.
  • the bursting index expressed in kPa.m 2 /g, is determined by dividing this value by the basis weight of the sheet tested. Dry breaking length is measured in the machine direction with a Testometric AX tensile device according to TAPPI T494 om-01. The result is expressed in km. f) Viscosity measurement over time with HAAKE IQ Air
  • the Haake Viscometer IQ Air is a viscometer operating on the basis of an air bearing motor driving a geometry allowing controlled shear or controlled shear stress tests. This device makes it possible, with a propeller-type module, to measure the viscosity deployed by the polymer during its dissolution over time.
  • the polymer solution is prepared directly in the sample holder.
  • type A products are anionic and type C products are cationic.
  • Type X products are high charge density products which can each be used, for example, as a coagulant.
  • Product Xi is inorganic in nature, while product X2 is organic.
  • Polymer Ai Water-soluble polymer composed of 30 mol% of sodium acrylate and 70 mol% of acrylamide in the form of an inverse emulsion, this emulsion comprising 29% of Ai, 30% of water, and 30% by weight of oil.
  • Ai has an average molecular weight of 20 million Dalton (Brookfield viscosity of 8.16 cps (applicable for all the polymers below: UL modulus, 0.1%, NaCl IM, 60 rpm 1 , 23° C.)).
  • Polymer A2 Water-soluble polymer composed of 30 mol% sodium acrylate and 70 mol% acrylamide in oily suspension form (distilled inverse emulsion). This suspension contains 50% by weight of A2, 40% by weight of oil, 5% of water. A2 has an average molecular weight of 18 million Daltons (Brookfield viscosity of 7.76 cps).
  • Polymer A3 Water-soluble polymer composed of 30 mol% sodium acrylate and 70 mol% acrylamide in powder form. A3 has an average molecular weight of 18 million Daltons (Brookfield viscosity 7.71 cps).
  • Polymer A4 Water-soluble polymer composed of 30 mol% sodium acrylate and 70 mol% acrylamide in powder form. A4 has an average molecular weight of 5 million Daltons (Brookfield viscosity 2.21 cps).
  • the oily suspension contains 55.5% by weight of As polymer, 37.5% by weight of oil, 4.5% by weight of bentonite, 2% by weight of sorbitan monooleate, and 0.5% by weight of The ethoxylated C13 oxo alcohol, As has an average molecular weight of 18 million Daltons (Brookfield viscosity 7.71 cps).
  • Polymer Ab Water-soluble polymer composed of 30 mol% sodium acrylate and 70 mol% acrylamide in the form of anhydrous oily suspension. The average size of the polymer particles is between 1 and less than 300 ⁇ m.
  • the oily suspension contains 52.5% by weight of polymer Ab, 40.5% by weight of oil, 4.5% by weight of bentonite, 2% by weight of sorbitan monooleate, and 0.5% by weight of C13 oxo ethoxylated alcohol, Ab has an average molecular weight of 5 million Daltons (Brookfield viscosity 2.21 cps).
  • Ci Water-soluble polymer composed of 15 mol% of chloromethylated dimethylaminoethyl acrylate (AD AME) and 85 mol% of acrylamide in the form of an inverse emulsion, this emulsion containing 35% of Ci, 30% of water, and 30% in oil weight.
  • Ci has an average molecular weight of 8 million Daltons (Brookfield viscosity of 4.86 cps).
  • Polymer C2 Water-soluble polymer composed of 15 mol% of chloromethylated dimethylaminoethyl acrylate (AD AME) and 85 mol% of acrylamide in oily suspension form (distilled inverse emulsion). This suspension contains 50% by weight of C2, 40% by weight of oil, and 5% of water. C2 has an average molecular weight of 8 million Daltons (Brookfield viscosity of 4.96 cps).
  • Polymer C3 Water-soluble polymer composed of 15 mol% of chloromethylated dimethylaminoethyl acrylate (AD AME) and 85 mol% of acrylamide in powder form. C3 has an average molecular weight of 9 million Daltons (Brookfield viscosity 4.96 cps).
  • C4 polymer Water-soluble polymer composed of 15 mol% of chloromethylated dimethylaminoethyl acrylate (AD AME) and 85 mol% of acrylamide in the form of anhydrous oily suspension.
  • the average size of the polymer particles is between 1 and less than 300 mhi.
  • the oily suspension contains 52.5% by weight of C4 polymer, 40.5% by weight of oil, 4.5% by weight of bentonite, 2% by weight of sorbitan monooleate, and 0.5% by weight C13 oxo ethoxylated alcohol.
  • C4 has an average molecular weight of 8 million Daltons (Brookfield viscosity 4.96 cps).
  • Product Xi Polyaluminium chloride containing 18% by weight of alumina (Al2O3).
  • Product X2 Cationic product exhibiting a cationic charge density of 5.5 meq/g, resulting from the Hofmann reaction on a polyacrylamide.
  • Figure 1 represents the curves of viscosity as a function of time for the polymers Ai, A2 and A3 and As for a polymer concentration of 0.3% by weight in water.
  • Figure 2 represents the curve of viscosity as a function of time for the polymer As and details the method of calculating the factor F( C >).
  • polymer solutions are prepared at the desired concentration (0.1%, 0.3%, or 0.5% by weight). After 2 minutes of preparation, the polymer solutions are filtered through a filter calibrated at 300 mhi. If the filter is covered with polymer particles, the application test is not carried out (NA: Not Applicable). The filtrates are used directly for the application tests.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
EP21743222.8A 2020-07-30 2021-06-24 Herstellungsverfahren eines papier und karton Active EP4189162B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2008078A FR3113069B1 (fr) 2020-07-30 2020-07-30 Procede de fabrication de papier et de carton
PCT/FR2021/051158 WO2022023631A1 (fr) 2020-07-30 2021-06-24 Procede de fabrication de papier et de carton

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EP4189162A1 true EP4189162A1 (de) 2023-06-07
EP4189162C0 EP4189162C0 (de) 2024-08-07
EP4189162B1 EP4189162B1 (de) 2024-08-07

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US (1) US20230295877A1 (de)
EP (1) EP4189162B1 (de)
CN (1) CN116096963B (de)
CA (1) CA3187065A1 (de)
FR (1) FR3113069B1 (de)
WO (1) WO2022023631A1 (de)

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Publication number Priority date Publication date Assignee Title
FR2779752B1 (fr) * 1998-06-12 2000-08-11 Snf Sa Procede de fabrication de papier et carton et nouveaux agents de retention correspondants, et papiers et cartons ainsi obtenus
US7396874B2 (en) * 2002-12-06 2008-07-08 Hercules Incorporated Cationic or amphoteric copolymers prepared in an inverse emulsion matrix and their use in preparing cellulosic fiber compositions
KR100919463B1 (ko) * 2004-12-30 2009-09-28 악조 노벨 엔.브이. 조성물 및 제지에서의 이의 용도
FR2882373B1 (fr) * 2005-02-24 2007-04-27 Snf Sas Soc Par Actions Simpli Procede de fabrication de papier et carton de grande resistance a sec et papiers et cartons ainsi obtenus
FR2963364B1 (fr) * 2010-08-02 2014-12-26 Snf Sas Procede de fabrication de papier et carton presentant des proprietes de retention et d'egouttage ameliorees.
FR3048436B1 (fr) * 2016-03-03 2018-03-23 S.P.C.M. Sa Procede de fabrication de papier et de carton

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Publication number Publication date
FR3113069B1 (fr) 2022-10-14
CN116096963A (zh) 2023-05-09
CN116096963B (zh) 2024-05-17
FR3113069A1 (fr) 2022-02-04
WO2022023631A1 (fr) 2022-02-03
BR112023001079A2 (pt) 2023-03-07
US20230295877A1 (en) 2023-09-21
EP4189162C0 (de) 2024-08-07
CA3187065A1 (en) 2022-02-03
EP4189162B1 (de) 2024-08-07

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