WO2024084004A1 - Procédé de finition de papier, composition pour un couchage de papier, papier et utilisation du papier - Google Patents

Procédé de finition de papier, composition pour un couchage de papier, papier et utilisation du papier Download PDF

Info

Publication number
WO2024084004A1
WO2024084004A1 PCT/EP2023/079181 EP2023079181W WO2024084004A1 WO 2024084004 A1 WO2024084004 A1 WO 2024084004A1 EP 2023079181 W EP2023079181 W EP 2023079181W WO 2024084004 A1 WO2024084004 A1 WO 2024084004A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
composition
coating
silicate
metakaolin
Prior art date
Application number
PCT/EP2023/079181
Other languages
German (de)
English (en)
Inventor
Oliver Vogt
Andreas Geissler
Stephan Felix SCHWAB
Markus BIESALSKI
Eddie Koenders
Original Assignee
Technische Universität Darmstadt
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 Technische Universität Darmstadt filed Critical Technische Universität Darmstadt
Publication of WO2024084004A1 publication Critical patent/WO2024084004A1/fr

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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • 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
    • D21H17/73—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes

Definitions

  • the invention relates to processes for paper finishing, a composition for a paper coating, paper and the use of the paper.
  • the process is characterized in that thin, homogeneous, visually appealing and flexible paper coatings can be produced.
  • the composition for a paper coating is optimized in conjunction with the processes.
  • the specific properties of these paper products are usually generated by special fibers, additives and coatings.
  • the finishing of paper products which includes functionalization with additives as well as coatings, has the purpose of implementing properties that a pure fiber fabric, a so-called raw paper, does not have.
  • the functions addressed by these processes can be extremely diverse.
  • the interaction with other media can be influenced, particularly via coatings. This plays a role in compatibility with downstream process steps, including printability and bondability, in terms of barrier properties or also in the resistance of paper products, e.g. to water, temperature, light and chemicals. But antimicrobial properties or the influence on fire properties can also be influenced.
  • Biopolymers are either used as a mixture or chemically modified in such a way that they can be used to replace classic functional chemicals. This strategy is fundamentally justified and can help to reduce the use of fossil raw materials. Depending on the biopolymers used, however, some of these materials are not available in the quantities required by the paper industry, compete with use as food, or have been chemically modified to such an extent that the original advantage of biodegradability has been lost.
  • EP 3426730 B1 discloses heat-treated kaolin pigments, processes for their preparation and applications for paper (coatings) and other coatings.
  • EP 3426730 B1 teaches that the dispersants used in the process should be free of alkali and alkaline earth metals, in particular free of sodium.
  • EP 0572037 B1 discloses coating pigments for cellulose-containing printing media, in particular for paper and cardboard, which contain at least one swellable layered silicate.
  • Minerals from the smectite group are used as swellable layered silicates, such as bentonite, montmorillonite, hectorite, saponite or nontronite.
  • the smectite group is classified as three-layer clay minerals. These minerals are characterized by non-integer layer charges (X ⁇ 0.25 to 0.6). This charge of the layers is a basic requirement for the extraordinarily high water retention and thus the swelling capacity of the disclosed representatives of the smectite group.
  • EP 0572037 B1 teaches that the European bentonites with a higher content of exchangeable alkaline earth ions, in particular calcium ions, must be activated with targeted activation using suitable alkali compounds.
  • EP 0585411 B1 discloses pigments that can be used as coating and filler pigments in the paper industry or in the production of paints and varnishes, including organic and petrochemical binders.
  • EP 0585411 B1 discloses composite particles of titanium dioxide and calcined kaolin, which are mixed and bonded to form uniform particles using cationic polyelectrolytes. These composite pigments can be used in a conventional coating color formulation to coat paper.
  • a further object of the invention is to provide a corresponding composition for a paper coating that meets these requirements. Furthermore, it is also an object, under these additional conditions, to provide a paper that is characterized by a thin, smooth, visually appealing, well-adhering and/or flexible coating.
  • the invention relates to a method for paper finishing comprising the steps: - Providing paper,
  • composition for a paper coating comprising a metakaolin and a water glass, and optionally additives, the composition preferably being according to this disclosure
  • the invention in a second aspect, relates to a composition for a paper coating comprising: a) a metakaolin with the following components (in wt. %): 50 to 65 SiO2, 25 to 45 Al2O3, 0 to 5 Fe2O3, 0 to 5 TiO2, and b) a water glass consisting of an aqueous solution of alkali silicate, selected from sodium silicate, potassium silicate and/or lithium silicate, with a solids content of between 10 and 50 wt. %, preferably between 20 and 40 wt. %, based on the mass of the solution, wherein the alkali silicate has a molar modulus, i.e.
  • the invention relates to a paper which is surface-modified with a paper coating, wherein the paper coating comprises the composition according to this disclosure, and/or wherein the paper coating has resulted from the curing of the composition according to this disclosure.
  • the invention relates to a use of the paper for packaging or magazines, for decorative purposes as well as for construction materials, paper furniture, in interior design, and/or lightweight construction.
  • geopolymers refers to inorganic structures that can be produced on the basis of an aluminosilicate source, e.g. fly ash or metakaolin, and an alkaline activator such as water glass. During the production of geopolymers, a cross-linking reaction takes place between water glass and the aluminosilicate source, whereby certain chemical requirements for the water glass and the aluminosilicate source as well as their quantitative composition must be met.
  • an aluminosilicate source e.g. fly ash or metakaolin
  • an alkaline activator such as water glass.
  • the setting behavior and properties of a geopolymer glue depend essentially on the molar silicon to aluminum ratio of the aluminosilicate source. This ratio is particularly advantageous for highly reactive metakaolin, which is obtained by calcining kaolin at 600 to 750 °C. Geopolymers made from metakaolin usually harden at room temperature, while fly ash-based geopolymers require higher temperatures.
  • the metakaolin required for the synthesis of the geopolymer, or its starting material kaolinite is a well-known raw material within the paper industry. Around 40% of the kaolinite mined globally is used as a filler and coating pigment in the paper industry, especially when the focus is on the gloss and smoothness of the products.
  • the selection of the metakaolin is mainly based on the degree of whiteness, which is of particular interest for the appearance of the coated paper, and on the particle size, which has a considerable influence on the liquid requirement of the formulation.
  • this inorganic fraction which remains after incineration and is therefore referred to as ash, is not subject to any quantitative regulations.
  • the inorganic load cannot actually be biodegraded and, provided it does not contain any heavy metals, is completely uncritical for the biodegradation of the fiber fraction or for the surrounding ecosystem.
  • the inorganic material i.e. usually chalk, kaolin, talcum and titanium dioxide, is broken down together with the secondary fibers and processed into new paper materials.
  • the invention relates to a method for paper finishing comprising the steps:
  • composition for a paper coating the composition comprising a metakaolin and a water glass, and optionally additives, the composition preferably being according to this disclosure
  • compositions By applying the composition to the paper in a controlled manner and then curing the composition on the paper in accordance with an adapted or optimized geopolymer recipe, it was possible to produce very well-adhering, thin, flexible and, depending on requirements, bright or glossy layers on the paper.
  • the nanoporous structure of the resulting coating also enables excellent printability using high-speed inkjet processes, whereby despite the high gloss, smudge resistance is achieved after less than 0.3 seconds.
  • the method comprises the step of moistening the paper.
  • Pre-moistening the paper ensures that it is no longer able to extract significant amounts of water from the geopolymer formulation, which means that re-moistening can be kept to a minimum.
  • Pre-moistening or moistening causes the paper to swell and expand. It is advantageous if the paper is already moist before the composition is applied, because then geopolymerization, ie the hardening of the composition, is not accompanied by a change in the paper. There is then no There are no waves between the forming geopolymer layer and the paper, but the interface remains flat.
  • the papers can be pre-moistened on a laboratory scale using a size press and water and conditioned in closed containers for 12 hours. This significantly improves the coating quality because the dimensional changes in the paper and the coating can be brought into line during the drying process.
  • the "floe breakage effect" that occurs as a result of drying shrinkage deformations can be avoided or at least reduced in this way.
  • this procedure also offers the potential to save considerable amounts of drying energy, since the freshly produced papers can be coated directly in the wet state and do not have to be dried first.
  • the invention relates to a process for paper production and paper finishing comprising the steps:
  • composition for a paper coating comprising a metakaolin and a water glass, and optionally additives, the composition preferably being according to this disclosure
  • the separate aspect for a process for paper production and paper finishing combines the paper production processes known in the prior art with the paper finishing according to this disclosure.
  • the person skilled in the art knows the processes and steps for paper production that are usual in the prior art, ie the provision of a pulp suspension, the sheet formation by means of a screen, the subsequent mechanical and hydrodynamic dewatering processes and the final thermal drying.
  • the disclosed process for paper production and paper finishing is advantageous because in particular the drying step in paper production can be omitted for the time being and the paper produced can be subjected to finishing directly. This process can save considerable amounts of drying energy.
  • the paper does not need to be moistened separately for paper finishing because it leaves the shortened production process moistened.
  • the disclosed combined process for paper production and paper finishing is therefore very efficient in terms of both energy and process economy.
  • the step of moistening the paper comprises adjusting the fiber saturation point by impregnating the paper with water in a size press and then storing it in a closed container.
  • the composition is applied to the paper by means of blade coating, doctor blade application, a high-speed inkjet process or a cast coating process. In one embodiment of the method, the composition is applied to the paper by means of a flexographic process or screen printing process.
  • Cast coating processes are advantageous if gloss and smoothness of the coating are desired. Flexographic or screen printing processes are advantageous if a spatially resolved application is to be achieved.
  • the curing of the composition takes place at a temperature between 10 and 80 °C, preferably between 20 to 80 °C, more preferably between 60 to 80 °C.
  • the time for curing and the temperature depend on the molar modulus of the water glass used, with low molar moduli being associated with higher reactivity and faster curing (see Table 4). Curing of the geopolymer at room temperature is possible for water glasses with a molar modulus of 1.7 and a molar modulus of 2.8 and takes 6 hours and 12 to 24 hours respectively. Increasing the temperature to 60 to 80 °C leads to accelerated curing and a more even and better covering line with the same flexibility.
  • the composition is prepared by prior
  • the composition applied to the paper is protected from drying out by one of the following measures:
  • the composition applied to the paper with an airtight and/or waterproof film the airtight and/or waterproof film being made of PE, PP or PET,
  • Covering the composition applied to the paper with an airtight and/or waterproof film is a suitable measure on a laboratory scale.
  • PP polypropylene
  • PET film PET film
  • PET film PET film
  • PE Polyethylene
  • PE film is also possible, but only works to a limited extent, especially when heated, e.g. to temperatures between 60 and 80 °C. In the case of a PE film, the softening temperature of the selected polyethylene must be above the temperature required for curing.
  • Storing the composition applied to the paper in a climate-controlled cabinet is advantageous and is equivalent to an incubator in which the temperature and humidity can be adjusted.
  • the curing temperature can be adapted and adjusted to the selected water glass, i.e. in particular the molar modulus of the water glass.
  • the method of choice is to remoisten the composition applied to the paper by spraying it with water (or misting it with water vapor) using spray nozzles.
  • the system for spraying water using spray nozzles can be scaled and implemented accordingly depending on the throughput.
  • the invention relates to a composition for a paper coating
  • the inventors established the requirements for the chemical composition, both quantitatively and qualitatively, for a paper coating. Both the molar modulus of the alkali silicate used turned out to be critical, as did - in combination with this - the coordinated mass proportions of metakaolin and water glass in the composition. The specified ranges for the molar modulus and the mass proportions of metakaolin and water glass within the composition lead to good results.
  • the mass fraction of metakaolin in the composition can be increased to up to 50% by weight, which advantageously reduces the risk of drying shrinkage cracks and increases the opacity of the coating.
  • the viscosity increases significantly at a mass fraction of up to 50% by weight, so that the process must be adapted accordingly.
  • the mass fraction of metakaolin in the composition can be up to 40% by weight, which generally results in highly suitable and spreadable compositions.
  • the metakaolin content can also be reduced to 15% by weight.
  • the expert is able to determine the rheological properties and the reactivity of the composition and/or deliberately adjust them.
  • the character of the geopolymers differs significantly from conventional coating colors, so that certain adjustments and precautions must be taken within the process. While conventional coating colors can be formulated and applied up to a maximum dynamic viscosity of approx. 1500 mPas, geopolymer-based coating colors can have a significantly higher viscosity. This requires reduced application speeds or the application of larger layer thicknesses. This prevents the shear rate in the fluid from increasing too much, which could lead to film tears or damage to the substrate or excessive stress on the coating unit. At the same time, geopolymers have pronounced shear-thinning properties, which can be advantageous for their behavior in the coating gap. In order to maintain their processability, ie, for example, their conveyability and flowability, the geopolymers must be kept in continuous motion to counteract an excessive increase in viscosity.
  • geopolymers While conventional coating colors are fixed to the substrate by thermally softening binder polymers, geopolymers are reactive systems that can react with themselves as well as with hydrophilic, organic, mineral and metallic surfaces. Adhesion to technical surfaces of mixing, conveying and coating units must be avoided, so cleaning intervals must be observed and hydrophobic coatings must be used on the technical surfaces. As soon as the geopolymer has hardened, it can only be removed with the loss of the top metal or mineral layer.
  • the composition for a paper coating comprises a) a metakaolin with the following components (in wt. %): 50 to 65 SiO2, 25 to 45 Al2O3, 0 to 0.5 Fe2Oa, 0.2 to 3 TiO2, preferably 1 to 2 TiO2, and b) a water glass consisting of an aqueous solution of alkali silicate, selected from sodium silicate, potassium silicate and/or lithium silicate, with a solids content between 10 and 50 wt. %, preferably between 20 and 40 wt. %, based on the mass of the solution, wherein the alkali silicate has a molar modulus, i.e.
  • a Fe2O3 content of 0 to 0.5 wt.% is preferred, which can be increased by the use of 0.2 to 3 TiO2, preferably 1 to 2 TiO2 wt.%.
  • the composition for a paper coating comprises a) a metakaolin with the following components (in wt. %): 50 to 65 SiO2, 25 to 45 Al2O3, 1 to 5 Fe2O3, 0 to 1 TiO2, and b) a water glass consisting of an aqueous solution of alkali silicate, selected from sodium silicate, potassium silicate and/or lithium silicate, with a solids content between 10 and 50 wt. %, preferably between 20 and 40 wt.
  • a Fe2O3 content of 1 to 5 wt.% is preferred.
  • the composition can have a TiO2 content of 0 to 1 wt.%.
  • the composition for a paper coating comprises additives, fillers, e.g. talc and CaCO3, and/or pigments, e.g. TiO2.
  • CaCOs is an inexpensive filler.
  • the properties, especially the flexibility and whiteness of the coatings, can be further improved by adding pigments, calcium carbonate and/or titanium oxide.
  • the geopolymer formulation proves to be compatible with all mineral fillers and pigments commonly used in the paper industry, whereby the solid-to-liquid ratio should be maintained and the additive is added as a partial replacement for the metakaolin.
  • the amount of additives, fillers and/or pigments used must be limited and coordinated in such a way that the setting process is not unduly delayed or even stopped.
  • the use of titanium dioxide must be limited to a maximum of 20% by weight and that of Neuburg Siliceous Earth to a maximum of 15% by weight so that the geopolymers can still harden.
  • the alkali silicate has a molar modulus, i.e. a SiO2/R2O ratio, between 2.0 and 2.5, or between 1.9 and 2.7, or between 1.8 and 2.9.
  • the alkali silicate is potassium silicate having a molar modulus, i.e. a SiO2/K2O ratio, between 2.0 and 2.5, or between 1.9 and 2.7, or between 1.8 and 2.9.
  • the water glass consists of an aqueous solution of sodium silicate, having a solids content of between 10 and 30 wt.% based on the mass of the solution, wherein the Sodium silicate has a molar modulus, ie a SiC>2/Na2O ratio, between 1.7 and 3.8, or between 1.8 and 2.9, or between 1.9 and 2.7, preferably between 2.0 and 2.5.
  • the water glass consists of an aqueous solution of lithium silicate, having a solids content between 10 and 50 wt.%, preferably 20 and 40 wt.%, based on the mass of the solution, wherein the lithium silicate has a molar modulus, i.e. a SiO2/Li2O ratio, between 1.7 and 3.8, or between 1.8 and 2.9, or between 1.9 and 2.7, preferably between 2.0 and 2.5.
  • a molar modulus i.e. a SiO2/Li2O ratio
  • the water glass consists of an aqueous solution of potassium silicate, having a solids content between 10 and 50 wt.%, preferably 20 and 40 wt.%, based on the mass of the solution, wherein the potassium silicate has a molar modulus, i.e. a SiO2/K2O ratio, between 1.7 and 3.8, or between 1.8 and 2.9, or between 1.9 and 2.7, preferably between 2.0 and 2.5.
  • a molar modulus i.e. a SiO2/K2O ratio
  • the invention relates to a paper which is surface-modified with a paper coating, wherein the paper coating comprises the composition according to this disclosure, and/or wherein the paper coating has resulted from the curing of the composition according to this disclosure.
  • the resulting papers are characterized by a thin, smooth, visually appealing, well-adhering and/or flexible coating.
  • the papers are environmentally friendly and sustainable in terms of the raw materials used due to the absence of synthetic organic substances.
  • the resulting papers have low CO2 emissions per kilogram of paper produced compared to conventional paper finishing processes.
  • the invention relates to a use of the paper for packaging or magazines, for decorative purposes as well as for construction materials, paper furniture, in interior design, and/or lightweight construction.
  • the papers produced are very well suited for packaging or magazines, for decorative purposes as well as for construction materials, paper furniture, interior design and/or lightweight construction.
  • Geopolymers themselves are very fireproof and give the coated papers increased fire resistance and can be used, for example, in exhibition stand construction, where fire protection must be guaranteed.
  • the coated papers are also suitable for use in the mobility sector, eg in trains and airplanes.
  • Metakaolins are tempered clays which, in addition to kaolinite as the main aluminosilicate source or as the main mineral, can also contain smectite/montmorillonite and illite. Metakaolins with the following general composition (in % by weight) can be used in the coating color formulations described here: 50 to 65 SiO2, 25 to 45 Al2O3, 0 to 5 Fe2O3, 0.2 to 2 TiO2. The expert knows the mineral kaolinite as a frequently occurring layered silicate from the kaolinite-serpentine group with the crystal chemical composition Al4[(OH)s
  • Metakaolins may also contain the following additional components (in wt.%): 0.5 to 5 CaO, 0.2 to 4 MgO, 0.2 to 1 K2O, and 0.2 to 3 Na2O.
  • the grain sizes of the metakaolins are preferably between 0 and 50 pm, in particular between 1 and 5 pm.
  • the whiteness of the metakaolins should be as high as possible for paper applications and should be at least 85 to 95%.
  • K-1100 (KAOPOZZTM): 54 ⁇ 2 wt% SiO 2 , 43 ⁇ 2 wt% AI2O3, 1.3 wt% Fe 2 O 3 ,
  • PowerPozz® white (Newchem GmbH): 54 - 56 wt.% SiO2, 40 - 42 wt.% AI2O3, ⁇ 1.4 wt.% Fe2O3, ⁇ 0.4 wt.% K2O,
  • Table 1 Material properties of the metakaolins Antec MM, K-1200, K-1100, Metastar 501 and PowerPozz.
  • the pozzolan activity describes the reactivity with calcium hydroxide.
  • the amorphous fraction was determined by XRD analysis.
  • water glass refers exclusively to aqueous solutions of amorphous, water-soluble sodium, potassium and lithium silicates, with a solids content of between 10 and 50% by weight based on the mass of the solution.
  • Water glass is also understood by the expert as a trivial term for water-soluble alkali silicates, with water glasses based on potassium silicate being the most suitable.
  • Water glasses were used as alkaline activators, which together with the aluminosilicate source, e.g. fly ash or metakaolin, form the inorganic structures of the geopolymer.
  • aluminosilicate source e.g. fly ash or metakaolin
  • a reaction occurs between the metakaolin used and the alkaline activator solution, which forms a hardening matrix. This reaction was observed at moderate Heat input tests were carried out at temperatures above 23 °C, at temperatures above 40 °C, and at temperatures between 60 and 80 °C.
  • a characteristic parameter for the alkali silicates used is the molar modulus.
  • the molar modulus corresponds to the molar ratio of SiC>2 to R2O, where R corresponds to one of the three alkali metals, i.e. sodium (Na), potassium (K) or lithium (Li).
  • R corresponds to one of the three alkali metals, i.e. sodium (Na), potassium (K) or lithium (Li).
  • Geosil 14517 is an aqueous solution of potassium silicate with a solids content of 45.0 wt.% based on the mass of the solution, which, due to its composition, leads to stable bonds with high strength, especially in combination with alkaline-activated fillers. Geosil 14517 has a molar modulus of 1.7 and is classified as very reactive.
  • Betol K28-T is a potassium silicate with a solids content of 28.0% by weight based on the mass of the solution. Betol K28-T reacts with mineral substrates by silicification. The good binding power and high temperature resistance are advantageous in the formulation of fireproof and acid-resistant adhesives.
  • the molar modulus of Betol K28-T is 3.8 and has comparatively long drying and reaction times.
  • Table 2 Composition of a geopolymer formulation for producing a glossy paper coating
  • the OA solution (optical brightener) used was CALCOFLUOR White, a fluorescent blue dye, at a concentration of 5 mmol.
  • pure water was used instead of the OA solution.
  • the components (Table 2) were mixed in a speed mixer (Hauschild DAC 400) to form a degassed geopolymer glue.
  • the device was operated for 4 minutes at 2000 rpm and 30 mbar. This leads to a homogeneous mixture of the coating formulation, after which the actual surface application was carried out using a film drawing frame 60 (Byk, with a film width of 60 mm).
  • a matt opacity test card (from Byk) was used as the substrate and coated with a wet film thickness of 90 pm. Pre-moistening was not carried out with this paper substrate.
  • the still wet coating was covered with a PET film (Hostaphan®) and the laminate produced in this way was stored for one day at 60 °C.
  • the geopolymer-coated paper produced in this way is suitable for printing using high-speed inkjet processes due to the nanoporosity of the geopolymer.
  • Table 3 Composition of a geopolymer formulation for the production of a matt paper coating
  • reaction conditions or setting conditions depend on the molar modulus of the water glass used, with low molar moduli being associated with higher reactivity. For water glasses with different molar moduli, it was determined which reaction time must be observed depending on the temperature in order to ensure sufficient setting of the geopolymer coating (Table 4). Table 4: Curing times for water glasses with different molar moduli depending on temperature

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé de finition de papier, une composition pour un couchage de papier, du papier et l'utilisation du papier. Le procédé est caractérisé en ce que des couchages de papier minces, homogènes, visuellement attrayants et souples peuvent être réalisés. La composition pour un couchage de papier est optimisée conjointement avec le procédé.
PCT/EP2023/079181 2022-10-21 2023-10-19 Procédé de finition de papier, composition pour un couchage de papier, papier et utilisation du papier WO2024084004A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022127915.4 2022-10-21
DE102022127915.4A DE102022127915A1 (de) 2022-10-21 2022-10-21 Verfahren zur Papierveredelung, Zusammensetzung für einen Papierstrich, Papier und Verwendung des Papiers

Publications (1)

Publication Number Publication Date
WO2024084004A1 true WO2024084004A1 (fr) 2024-04-25

Family

ID=88511532

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/079181 WO2024084004A1 (fr) 2022-10-21 2023-10-19 Procédé de finition de papier, composition pour un couchage de papier, papier et utilisation du papier

Country Status (2)

Country Link
DE (1) DE102022127915A1 (fr)
WO (1) WO2024084004A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0585411B1 (fr) 1991-05-08 1995-12-06 Engelhard Corporation Pigments composites opacifiants au dioxyde de titane calcine et au kaolin, procedes de preparation et d'utilisation
EP0572037B1 (fr) 1992-05-29 1996-07-10 Süd-Chemie Ag Pigment de couchage
WO2012066308A2 (fr) * 2010-11-15 2012-05-24 Imerys Minerals Limited Compositions
EP3426730B1 (fr) 2016-03-08 2020-06-17 BASF Corporation Pigment à base de kaolin ayant subi un traitement thermique à blancheur d'au moins 92 pour papier et revêtements
WO2021113281A1 (fr) * 2019-12-02 2021-06-10 3M Innovative Properties Company Matériaux ignifuges pour utilisation dans des batteries de véhicule électrique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0585411B1 (fr) 1991-05-08 1995-12-06 Engelhard Corporation Pigments composites opacifiants au dioxyde de titane calcine et au kaolin, procedes de preparation et d'utilisation
EP0572037B1 (fr) 1992-05-29 1996-07-10 Süd-Chemie Ag Pigment de couchage
WO2012066308A2 (fr) * 2010-11-15 2012-05-24 Imerys Minerals Limited Compositions
EP3426730B1 (fr) 2016-03-08 2020-06-17 BASF Corporation Pigment à base de kaolin ayant subi un traitement thermique à blancheur d'au moins 92 pour papier et revêtements
WO2021113281A1 (fr) * 2019-12-02 2021-06-10 3M Innovative Properties Company Matériaux ignifuges pour utilisation dans des batteries de véhicule électrique

Also Published As

Publication number Publication date
DE102022127915A1 (de) 2024-05-02

Similar Documents

Publication Publication Date Title
EP2928787B1 (fr) Procédé de fabrication d'un matériau d'emballage revêtu et matériau d'emballage doté d'au moins une couche d'arrêt pour compositions hydrophobes
EP2532706B1 (fr) Procédé de fabrication d'un matériau d'emballage revêtu et matériau d'emballage doté d'au moins une couche d'arrêt pour liaisons hydrophobes
DE2516097C3 (de) Verfahren zur Herstellung eines HilfsStoffes für die Papierherstellung und seine Verwendung
EP0192252B1 (fr) Procédé d'amélioration du "holdout" des couleurs d'impression, laques et masses de revêtement sur des produits en feuille constitués de fibres et de désencrage des fibres ainsi que masse pour la mise en oeuvre du procédé et produits en feuille obtenus
EP2160497B1 (fr) Production de dispersions de couchage
EP2004417A1 (fr) Procédé d'application de pigments d'interférence sur un substrat
KR20150024346A (ko) 보안 문서용 기재
EP1783273A1 (fr) Papier de sécurité imprégné de résine
EP1597432B1 (fr) Dispersion de revetement utilisable de maniere multifonctionnelle pour des substrats d'impression
WO2024084004A1 (fr) Procédé de finition de papier, composition pour un couchage de papier, papier et utilisation du papier
KR20170099835A (ko) 종이 매체, 이의 제조방법 및 이를 사용하여 제조된 보안 문서
DE112020001109T5 (de) Wasserdispergierbares Papier
DE10161093A1 (de) Dekorfolien mit großer Oberflächenhärte und hohen Kratz- und Abriebfestigkeiten und Verfahren zur Herstellung
EP3310498A1 (fr) Revêtement de panneaux dérivés du bois avec des films de résine aminique pourvus d'une surface facile à nettoyer, résistante à l'abrasion et hydrophobe
EP3303701B1 (fr) Materiau du support fibreux pour la production d'un papier de base de revetement poreux ou préimprégné, et procédé pour sa production
EP2365130A1 (fr) Composite de fibres imprégné, sa fabrication et son utilisation
DE102022106229A1 (de) Verbund auf Papierbasis als Lebensmittelverpackungsmaterial
EP2314765B1 (fr) Fabrication d'un composite en fibre, son utilisation et composite en fibre
DE102004038197B4 (de) Dekorpapier und Verwendung von Aluminiumsilikat zur Herstellung von Dekorpapier
WO2023072628A1 (fr) Couche barrière aux gaz, revêtement nanocomposite pour la production de la couche barrière aux gaz et procédé de production du revêtement
DE102020116925A1 (de) Wässrige Klebstoffmischung zum Verkleben von Papiermaterialien sowie ein Verfahren zum Herstellen derselben
EP4357521A1 (fr) Agent d'encollage de surface pour papier de sécurité, procédé d'encollage de surface d'un matériau de substrat de papier de sécurité, papier de sécurité et document de valeur
Seo et al. Effects of Montmorillonite Clay on Properties of Paper Coating Additives
EP3138958A1 (fr) Materiau de support fibreux destine a la fabrication d'un papier brut de revetement poreux ou d'un pre-impregne et son procede de fabrication