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WO2024126892A1 - Composition de taille de surface - Google Patents

Composition de taille de surface Download PDF

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Publication number
WO2024126892A1
WO2024126892A1 PCT/FI2023/050674 FI2023050674W WO2024126892A1 WO 2024126892 A1 WO2024126892 A1 WO 2024126892A1 FI 2023050674 W FI2023050674 W FI 2023050674W WO 2024126892 A1 WO2024126892 A1 WO 2024126892A1
Authority
WO
WIPO (PCT)
Prior art keywords
surface size
size composition
starch
paper
composition according
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.)
Ceased
Application number
PCT/FI2023/050674
Other languages
English (en)
Inventor
Asko Karppi
Matti Hietaniemi
Markus Korhonen
Mikko Virtanen
Jan‐Luiken HEMMES
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.)
Kemira Oyj
Original Assignee
Kemira Oyj
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 Kemira Oyj filed Critical Kemira Oyj
Publication of WO2024126892A1 publication Critical patent/WO2024126892A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • 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
    • 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
    • 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
    • D21H21/16—Sizing or water-repelling 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
    • 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

Definitions

  • the present disclosure generally relates to a surface size composition.
  • the disclosure relates particularly, though not exclusively, to a surface size composition comprising interpenetrating polymer network of anionic polyacrylamide and starch, and zirconium carbonate.
  • Cost efficiency is one important aspect when lower grades of paper or board are produced. Typical measures for obtaining cost efficiency are, for example, reduction of the basis weight of produced paper or board, increase of the filler content in the stock, as well as use of cheap fibre raw materials. However, many of these measures may have a negative impact on the properties of the obtained paper or board product, especially on the strength properties of the paper or board product.
  • Compression strength and burst strength are important strength properties for paper and board, especially for board grades, which are used for packaging.
  • Compression strength is often measured and given as Short-span Compression Test (SCT) strength, which may be used to predict the compression resistance of the final product, e.g. cardboard box.
  • SCT Short-span Compression Test
  • Burst strength indicates paper's or board's resistance to rupturing, and it is defined as the hydrostatic pressure needed to burst a sample when the pressure is applied uniformly across the side of the sample. Both the compression strength and burst strength are negatively affected when the amount of inorganic mineral fillers and/or recycled fibres in the stock is increased.
  • surface sizing can be used to increase hydrophobicity of the paper/board surface or to improve the strength properties of paper/board.
  • conventional surface sizing the sizing solution is applied on the surface of the formed, at least partially dried fibre web.
  • surface size solutions comprise mainly starch, but they may also comprise synthetic polymers.
  • the amount of synthetic polymer in the surface size solution has been limited by the increase of viscosity of the size solution. If the viscosity of the surface size solution becomes too high, it cannot be applied on the surface of the paper or board with present size applicators. Synthetic polymers are often also expensive, which make their use in low grade paper/board products uneconomical.
  • compositions which are suitable for use in surface sizing and which can be used to increase the strength properties of the paper or board.
  • compositions which are suitable for use in surface sizing and which can be used to increase the strength properties of the paper or board.
  • novel cost-effective surface size alternatives for improving the strength properties of paper or board.
  • the present invention provides a surface size composition
  • a surface size composition comprising interpenetrating polymer (IPN) network of anionic polyacrylamide (APAM) and starch, and zirconium carbonate.
  • IPN interpenetrating polymer
  • APAM anionic polyacrylamide
  • starch starch
  • zirconium carbonate zirconium carbonate
  • the present invention provides use of the surface size composition according to the present invention for surface sizing of paper or board.
  • the present invention provides a method for producing paper or board, the method comprising: (a) treating a paper stock with a paper auxiliary, a filler, or both to obtain a treated paper stock; (b) draining the treated paper stock with sheet formation to obtain a paper web; and (c) applying on the paper web the surface sizing composition according to the present invention to obtain treated paper web; and (d) drying the treated paper web.
  • the present invention provides paper or board comprising the surface size composition according to the present invention or produced with the method according to the present invention. It has been surprisingly found that performance of interpenetrating polymer network (IPN) of anionic polyacrylamide (APAM) and starch can be improved by zirconium complexation which takes place inside board after sizing process.
  • IPN interpenetrating polymer network
  • APAM anionic polyacrylamide
  • zirconium reaction/bonding can be reduced in size press slurry by selecting pH to slightly acid, which allows reaction/bonding after the surface size composition is applied on the board.
  • IPN of APAM and starch has less viscosity impact on surface size composition compared to surface size composition comprising APAM and starch as a mixture.
  • the surface size composition of the present invention allows use of higher temperatures in paper or board manufacturing process compared to processes not using the surface size composition of the present invention
  • the present invention provides a surface size composition
  • a surface size composition comprising interpenetrating polymer network (IPN) of anionic polyacrylamide (APAM) and starch, and zirconium carbonate.
  • IPN interpenetrating polymer network
  • APAM anionic polyacrylamide
  • starch starch
  • zirconium carbonate zirconium carbonate
  • An interpenetrating polymer network is a polymer comprising two or more networks which are at least partially interlaced on a molecular scale.
  • a mixture of two or more preformed polymer networks is not an IPN.
  • the interpenetrating polymer network of anionic polyacrylamide (APAM) and starch can be produced by polymerising acrylamide in presence of starch.
  • APAM anionic polyacrylamide
  • anionic amount in the APAM is from 3 mol-% to 30 mol-%, preferably 5 mol-% to 30 mol-%.
  • the APAM can be linear or cross-linked.
  • the starch of the IPN is viscosity reduced starch.
  • viscosity reduced starch starch which structure, i.e. carbon chain, has been shortened so that the viscosity of the viscosity reduced starch is smaller than viscosity of native starch.
  • the viscosity of the starch can be reduced by thermally or enzymatically or chemically converting starch.
  • the starch of the IPN is cationic starch, anionic starch, amphoteric starch or a mixture thereof.
  • the starch of the IPN has degree of cationic substitution (DS) 0.01 -0.1 and/or anionic substitution (DS) 0.005-0.05.
  • amount of the APAM of the IPN is from 50 wt-% to 95 wt-%, preferably from 70 wt-% to 90 wt-% based on total dry weight of the IPN material.
  • amount of the starch of the IPN is from 5 wt-% to 50 wt-%, preferably from 10 wt-% to 30 wt-%, based on total dry weight of the IPN material.
  • the zirconium carbonate comprises ammonium zirconium carbonate, potassium zirconium carbonate or a mixture thereof.
  • the surface size composition further comprises an additional polymer comprising carbohydrate polymer, such as carboxymethylcellulose (CMC), guar gum, starch, preferably the additional polymer is a viscosity reduced starch, more preferably thermally or enzymatically converted starch, even more preferably enzymatically converted starch, further even more preferably converted with alpha amylase, further even more preferably converted with thermosensitive alpha amylase.
  • CMC carboxymethylcellulose
  • the surface size composition further comprises a hydrophobation agent, preferably acrylate esters, more preferably styrene acrylate, such as alkylketene dimer (AKD).
  • a hydrophobation agent preferably acrylate esters, more preferably styrene acrylate, such as alkylketene dimer (AKD).
  • the hydrophobation agent is an acrylate based hydrophobation agent stabilized with anionic polymer, cationic polymer or amphoteric polymer.
  • pH of the surface size composition is slightly acidic, preferably the pH is 3.0-6.5, more preferably 3.5-6.0, even more preferably 5.0-6.0.
  • viscosity of the surface size composition is 100%-250% of the original viscosity of enzymatically degraded starch compared at sizing conditions of temperature and concentration.
  • the starch of the IPN material and the additional starch comprises any typical botanical starch such as potato starch, rice starch, wheat starch, corn starch, waxy corn starch, barley starch, tapioca starch, sweet potato starch, preferably potato starch.
  • the surface size composition is aqueous surface size composition.
  • amount of the IPN material in the surface size composition is from 1 wt- % to 8 wt-%, preferably from 1 wt-% to 5 wt-%, based on dry weight of the surface size composition.
  • amount of the zirconium carbonate in the surface size composition is from 0.01 wt-% to 1.0 wt-%, preferably from 0.01 wt-% to 0.5 wt-%, more preferably from 0.05 wt-% to 0.2 wt-%, as zirconium dioxide (ZrC>2), based on dry weight of the surface size composition.
  • amount of the additional polymer in the surface size composition is from 85 wt-% to 99 wt-%, preferably from 95 wt-% to 99 wt-%, based on dry weight of the surface size composition.
  • amount of the hydrophobation agent in the surface size composition is from 0.01 wt-% to 5 wt-%, preferably from 0.01 wt-% to 2 wt-%, based on dry weight of the surface size composition.
  • temperature of the surface size composition is at least 60 °C, such as 60 °C-95 °C, preferably at least 70 °C, such as 70 °C-95 °C.
  • the present invention provides use of the surface size composition of the present invention for surface sizing paper, board or the like.
  • the paper or board can be any suitable paper or board known in the art.
  • the board is selected from fluting, folding boxboard (FBB), white lined chipboard (WLC), solid bleached sulphate (SBS) board, solid unbleached sulphate (SUS) board and gypsum board.
  • FBB folding boxboard
  • WLC white lined chipboard
  • SBS solid bleached sulphate
  • SUS solid unbleached sulphate
  • the paper is selected from white top liner, liner including test liner, uncoated fine paper, label paper and release paper.
  • the present invention provides a method for producing paper and board, the method comprising: (a) treating a paper stock with a paper auxiliary, a filler, or both to obtain a treated paper stock; (b) draining the treated paper stock with sheet formation to obtain a paper web; and (c) applying on the paper web the surface sizing composition of the present invention to obtain treated paper web; and (d) drying the treated paper web.
  • the IPN and the zirconium carbonate of the sizing composition are applied sequentially on the paper web.
  • the IPN is applied on the paper web prior applying the zirconium carbonate on the paper web.
  • the zirconium carbonate is applied on the paper web prior applying the IPN on the paper web.
  • the IPN is applied on the paper web prior applying the zirconium carbonate on the paper web.
  • the paper stock used in the method may comprise virgin and/or recovered fibers. Any softwood or hardwood fiber typically used in the paper industry may be employed. Examples are unbleached chemical pulp, mechanical pulp including, for example, groundwood, thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), pressure groundwood, semichemical pulp, high-yield pulp, and refiner mechanical pulp (RMP), recycled fiber (RCF), such as corrugated cardboard (OCC).
  • TMP thermomechanical pulp
  • CMP chemithermomechanical pulp
  • RMP refiner mechanical pulp
  • RCF recycled fiber
  • OCF corrugated cardboard
  • the recycled fiber may be selected from old corrugated containerboard, mixed office waste, old newsprint, old magazines, double liner kraft, and any mixtures thereof.
  • the recycled fiber material may be selected from old corrugated containerboard or mixed waste or old newsprint without deinking stage.
  • Old corrugated containerboard denotes recycled fiber material comprising corrugated containers, which have liners of test liner, jute or kraft, and the term may cover also double sorted corrugated containerboard (DS OCC).
  • Mixed waste (MXW) denotes recycled mixture of recycled board, such as OCC, white lined chipboard and/or folding boxboard, and recycled paper, such as old newsprint, old magazines and/or office waste papers.
  • WLC White lined chipboard
  • the paper stock is preferably produced using wastepaper, which is used either alone or in a mixture with other fibrous materials.
  • temperature of the surface size composition of the present invention during the applying is at least 60 °C, such as 60 °C-95 °C, preferably at least 70 °C, such as 70 °C-95 °C.
  • the filler can be any suitable filler used in producing paper stock, such as s an inorganic pigment or a mixture of inorganic pigments.
  • the paper auxiliaries are for example, sizing agents, wet strength agents, dry strength agents, cationic or anionic retention agents based on synthetic polymers, dewatering agents, optical brighteners, defoamers, biocides, and paper dyes.
  • the sizing agents include alkylketene dimers (AKDs), alkenylsuccinic anhydrides (ASAs), and rosin size.
  • the wet strength agents are synthetic dry strengtheners such as polyvinylamine, or natural dry strengtheners, such as starch.
  • the wet strength agents include polyamidoamide-epichlorohydrin (PAE).
  • the dry strength agents are synthetic cationic polymers such as polyvinylamines, glyoxylated polyacrylamides or low molecular weight cationic or amphoteric polyacrylamides or natural polymers such as cationic starch.
  • the retention aids comprise anionic microparticles (colloidal silica, bentonite), anionic polyacrylamides, cationic polyacrylamides, cationic starch, cationic polyethyleneimine, or cationic polyvinylamine.
  • the present invention provides a paper or board comprising the surface size composition according of the present invention or produced with the method of the present invention.
  • Strength of recycled paper boards grades was improved by adding anionic IPN of APAM and oxidized starch together with zirconium carbonate to surface sizing solution. The effect of additions of were tested on SCT (short span compression strength) and burst strength (Table 1 ). Surface sizing was done with laboratory size-press (Mathis) and drum-dried. Size-press and drying parameters are listed below (Table 2). Surface sizing formulations were kept at 70 °C before use and approximately 170 g of formulation was used for surface sizing in each trial point. Size-press was washed between trial points. Five board sheets of A5 size were surface sized per trial point.
  • board sheets were cured in oven (105 °C, 10 min) and after curing they were taken into climate-controlled laboratory (RH 50%, 23 °C) for conditioning. Each board sheet was weighed at controlled conditions (RH50%, 23 °C) before and after surface sizing in order to determine the surface size pick-up. Pick-up was calculated by using equation 1 :
  • Table 1 Sheet testing devices and standard methods used for produced paper sheets. Table 2. Laboratory size-press and drying parameters.
  • Strength of recycled paper boards grades was improved by adding anionic IPN of APAM and oxidized starch together with zirconium carbonate to surface sizing solution. The effect of additions of were tested on SCT (short span compression strength) and burst strength (Table 1 ). Surface sizing was done with laboratory size-press (Mathis) and drum-dried. Size-press and drying parameters are listed below (Table 4). Surface sizing formulations were kept at 75 °C before use and approximately 170 g of formulation was used for surface sizing in each trial point. Size-press was washed between trial points. 5 board sheets of A5 size were surface sized per trial point.
  • untreated base paper for the study was obtained from another European board mill producing testliner (grammage 80g/m2) from RCF (recycled cellulose fiber).
  • Surface sizing starch was enzymatically degraded starch obtained from the same mill as the base paper.
  • Addition level of IPN was 3.5% of sizing solution and zirconium carbonate 15% of IPN (0.525% of sizing solution).
  • pH of the sizing solution was adjusted to pH 5. This was done to avoid crosslinking of zirconium carbonate and carboxylic groups of IPN to occur (occurs above pH6.5) in the sizing solution (to avoid viscosity increase). Concentration of the sizing solution was 9% in all the test points.
  • pH of the sizing solution was adjusted to pH 6.8 in all the test points to promote crosslinking. IPN was added first followed by zirconium carbonate. Concentration of the sizing solution was 12% in all the test points. The effect of additions of were tested on SCT (short span compression strength) and burst strength.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)

Abstract

L'invention concerne une composition de taille de surface comprenant un réseau polymère interpénétrant de polyacrylamide anionique et d'amidon, et du carbonate de zirconium. La composition de taille de surface peut en outre comprendre un polymère supplémentaire tel que de l'amidon et un agent d'hydrophobation. De plus, l'invention concerne l'utilisation de la composition de taille de surface pour le collage de surface de papier ou de carton.
PCT/FI2023/050674 2022-12-12 2023-12-11 Composition de taille de surface Ceased WO2024126892A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20226094 2022-12-12
FI20226094 2022-12-12

Publications (1)

Publication Number Publication Date
WO2024126892A1 true WO2024126892A1 (fr) 2024-06-20

Family

ID=89223239

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2023/050674 Ceased WO2024126892A1 (fr) 2022-12-12 2023-12-11 Composition de taille de surface

Country Status (1)

Country Link
WO (1) WO2024126892A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5472485A (en) * 1993-01-28 1995-12-05 Hopton Technologies, Inc. Use of zirconium salts to improve the surface sizing efficiency in paper making
WO1996009345A1 (fr) * 1994-09-19 1996-03-28 Hopton Technologies, Inc. Utilisation de sels de zirconium pour ameliorer l'efficacite de l'encollage dans la fabrication de papier
US20010051687A1 (en) * 1995-08-25 2001-12-13 Rajiv Bazaj Methods and agents for improving paper printability and strength

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5472485A (en) * 1993-01-28 1995-12-05 Hopton Technologies, Inc. Use of zirconium salts to improve the surface sizing efficiency in paper making
WO1996009345A1 (fr) * 1994-09-19 1996-03-28 Hopton Technologies, Inc. Utilisation de sels de zirconium pour ameliorer l'efficacite de l'encollage dans la fabrication de papier
US20010051687A1 (en) * 1995-08-25 2001-12-13 Rajiv Bazaj Methods and agents for improving paper printability and strength

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