WO2006069657A2 - Procede pour le collage en pile de papier - Google Patents

Procede pour le collage en pile de papier Download PDF

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Publication number
WO2006069657A2
WO2006069657A2 PCT/EP2005/013625 EP2005013625W WO2006069657A2 WO 2006069657 A2 WO2006069657 A2 WO 2006069657A2 EP 2005013625 W EP2005013625 W EP 2005013625W WO 2006069657 A2 WO2006069657 A2 WO 2006069657A2
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Prior art keywords
agent
paper
retention
retention agent
sizing
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German (de)
English (en)
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WO2006069657A3 (fr
Inventor
Simon Champ
Roland Ettl
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BASF SE
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BASF SE
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • 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
    • D21H23/14—Controlling the addition by selecting point of addition or time of contact between components
    • D21H23/18—Addition at a location where shear forces are avoided before sheet-forming, e.g. after pulp beating or refining
    • 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
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/55—Polyamides; Polyaminoamides; Polyester-amides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/56—Polyamines; Polyimines; Polyester-imides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers

Definitions

  • the invention relates to a process for engine sizing of paper, cardboard and paperboard by successively adding an aqueous dispersion of at least one reactive sizing agent and at least one retention agent to a laminar flow of paper stock having a fabric concentration of at most 2% by weight, based on dry fibers, and Dewatering of the pulp under foliation.
  • Reactive sizing agents include, for example, alkyl ketene dimers (AKD) and alkyl and alkenyl succinic anhydrides (ASA). Both classes of substances are added in the form of aqueous dispersions to the paper stock prior to sheet formation.
  • the AKD dispersions can be both cationically e.g. with the aid of cationic starch as well as anionic e.g. be stabilized by means of condensation products of naphthalenesulfonic acid and formaldehyde.
  • ASA alkyl ketene dimers
  • ASA alkyl and alkenyl succinic anhydrides
  • the influence of retention aids, pH, electrolytes and type of AKD addition, such as contact time and shear intensity, on the AKD retention in the paper was investigated.
  • the contact times were 30 and 60 seconds, respectively.
  • An exposure time of AKD to a stock of more than 5 minutes showed no increase in AKD retention, but led to a decrease in AKD retention, while the use of highly cationically charged polyelectrolytes together with AKD dispersions the retention of AKD in the Paper increased considerably.
  • AKD and ASA tend to hydrolyze in an aqueous medium and since a good retention of both sizing agents in the papermaking process is desired, the metering points on the paper machine for these sizing agents must be selected accordingly, cf. Lecture by George J. Batten, Jr., 1997 TAPPI Sizing Short Course.
  • AKD a position between the chest and the pressure sorters and, for ASA, a location between pressure sorter and before the last shear stage (screen) is proposed.
  • a headbox for a paper or board machine comprising at least one mixing chamber into which a liquid, e.g. a fiber suspension, flows in and in the over at least partially in different height (z) opening metering channels another fluid, e.g. An aqueous solution of a retention agent can be added to the fiber suspension.
  • a liquid e.g. a fiber suspension
  • another fluid e.g. An aqueous solution of a retention agent can be added to the fiber suspension.
  • a method and an apparatus for measuring the retention of at least one additive to a fiber suspension is known.
  • an additive such as AKD or a retention agent is added continuously to a fiber suspension stream under the action of high shear forces.
  • the mixture then flows through a tube in laminar flow and is then passed through a filter system, for example.
  • the filter system has a flow chamber in which the mixture of fiber suspension and at least one additive flows along a sieve in the direction of the surface area of the sieve.
  • the sample separated in the filter unit is then examined online to determine, for example, the retention.
  • the object of the invention is to provide an improved process for the production of paper products, wherein the efficiency of mass-producing agent and retention agent is coordinated with one another.
  • the object is achieved by a method for engine sizing of paper, board and cardboard by successively continuous addition of an aqueous dispersion of at least one reactive sizing agent and at least one retention agent to a laminar flowing stock flow with a concentration of at most 2 wt .-%, based on dry Fibers, and dewatering the stock under sheet formation, by metering the reactive sizing agent and the retention agent under turbulent flow at a location in the paper stock stream that is after the last shear stage and before the start of the dewatering process.
  • the dewatering process of the pulp begins with the impact of the pulp on the wire.
  • the contact time of reactive sizing agent and retention agent in the paper stock in the method according to the invention from the metering point to the beginning of the dewatering process is at most 30 seconds and preferably at most 10 seconds.
  • Suitable cellulose fibers are, for example, wood pulp and all annual plants.
  • Wood pulp includes, for example, groundwood, thermo-mechanical pulp (TMP), chemothermomechani- shear fabric (CTMP) 1 pressure sanding, semi-pulp, high-yield pulp and refiner mechanical pulp (RMP) and waste paper.
  • TMP thermo-mechanical pulp
  • CMP chemothermomechani- shear fabric
  • RMP refiner mechanical pulp
  • pulps that can be used in bleached or unbleached form as well as recovered paper fibers. Examples include sulphate, sulphite and soda pulps. Preference is given to using unbleached pulps, which are also referred to as unbleached kraft pulp.
  • the fibers mentioned can be used alone or in a mixture.
  • the pH of the cellulose fiber slurry is, for example, 4 to 8, preferably 6 to 8.
  • the substance concentration is at most 2% by weight and most often in the range of 0.5 to 1.0% by weight based on dry stock.
  • the stock may optionally contain fillers.
  • Suitable fillers are all insoluble products which are commonly used in papermaking, e.g. Calcium carbonate, chalk, precipitated calcium carbonate, calcium sulfate, titanium dioxide, dolomite, clay and / or talc.
  • the filler content may, for example, be from 0 to 35, preferably from 10 to 30,% by weight, based on dry paper stock.
  • the fillers are usually dosed to the thick matter or at a point between the sieves and the headbox in the thin material.
  • At least one reactive sizing agent is initially metered into the paper stock and then at least one retention agent is added.
  • the retention agent may be added to the stock at a single location, or preferably at two successive locations. In some cases it has proved to be advantageous if the retention agent is metered into the stock at three or four locations arranged one after the other.
  • the reactive sizing agent dosing station and the first retention agent dosing station may be virtually equidistant from the headbox or drainage on the wire so that the sizing agent and the retention agent added first is practical have the same contact time in the pulp.
  • the contact time of sizing agent and retention agent in the pulp 0.1 to 30 seconds and is chosen so that the optimum effect of sizing agent and retention agent is achieved.
  • sizing agent and retention agent are each metered in a turbulent flow to the pulp.
  • a suitable device for this is known from the above-mentioned US-B-6, 659,636.
  • Both sizing agent and retention agent are each metered into the laminar flow of paper stock in a mixing device in which a turbulent flow prevails.
  • the flow rate of the paper stock flow is, for example, at least 2 m / sec in the case of conventional paper machines and is usually in the range of 3 to 7 m / sec.
  • the mixing device stands, for example, from a two-component or multi-fluid nozzle, are passed through the recycled from the paper machine water and sizing agent or retention agent in turbulent flow in the laminar flowing stock flow.
  • sizing agents are particular anionic adjusted aqueous dispersions of a C 2- C 22 used at least until -Alkyldiketens.
  • Such dispersions are known, for example, from WO-A-00/23651, pages 2 to 12.
  • the reactive sizing agents are usually heated to a temperature above their melting point and then emulsified in water under the action of shear forces.
  • Liquid alkenylsuccinic anhydrides can already be emulsified at room temperature.
  • the conventional homogenizers are used.
  • dispersants are used.
  • at least one anionic dispersant is used for the preparation of anionic sizing dispersions, for example a dispersant from the group of condensation products
  • the anionic dispersants may be in the form of the free acids, the alkali metal, alkaline earth metal and / or ammonium salts.
  • the ammonium salts can be derived from both ammonia and from primary, secondary and tertiary amines, for example, the ammonium salts of dimethylamine, trimethylamine, hexylamine, cyclohexylamine, dicyclohexylamine, ethanolamine, diethanolamine and triethanolamine are.
  • the condensation products described above are known and commercially available. They are prepared by condensing said components, wherein instead of the free acids and the corresponding alkali metal, Alkaline earth metal or ammonium salts can use.
  • Suitable catalysts for the condensation are, for example, acids such as sulfuric acid, p-toluenesulfonic acid and phosphoric acid.
  • Naphthalenesulfonic acid or its alkali metal salts are condensed with formaldehyde preferably in a molar ratio of 1: 0.1 to 1: 2 and usually in a MoI ratio of 1: 0.5 to 1: 1.
  • the molar ratio for the production of condensates of phenol, phenolsulfonic acid and formaldehyde is also in the range given above, using any mixtures of phenol and phenolsulfonic acid instead of naphthalenesulfonic acid in the condensation with formaldehyde.
  • phenolsulfonic acid instead of phenolsulfonic acid, it is also possible to use the alkali metal and ammonium salts of phenolsulfonic acid.
  • the condensation of the abovementioned starting materials may optionally be carried out additionally in the presence of urea.
  • urea based on naphthalenesulfonic acid or on the mixture of phenol and phenolsulfonic acid, from 0.1 to 5 mol of urea are used per mole of naphthalenesulfonic acid or per mole of the mixture of phenol and phenolsulfonic acid.
  • the condensation products have, for example, molar masses in the range from 800 to 100,000, preferably 1,000 to 30,000 and in particular from 4,000 to 25,000.
  • anionic dispersants are salts which are obtained, for example, by neutralizing the condensation products with lithium hydroxide, Sodium hydroxide, potassium hydroxide or ammonia receives.
  • the pH of the salts is, for example, in the range of 7 to 10.
  • amphiphilic copolymers are amphiphilic copolymers
  • hydrophobic monoethylenically unsaturated monomers and (ii) hydrophilic monomers having an anionic group such as monoethylenically unsaturated carboxylic acids, monoethylenically unsaturated sulfonic acids, monoethylenically unsaturated phosphonic acids or mixtures thereof.
  • (a) are, for example, olefins having 2 to 150 carbon atoms, styrene, ⁇ -methylstyrene, ethylstyrene, 4-methylstyrene, acrylonitrile, methacrylonitrile, esters of monoethylenically unsaturated C 3 - to C 5 -carboxylic acids and monohydric alcohols, amides of
  • Acrylic acid or methacrylic acid with C 1 - to C 24 -alkylamines vinyl esters of saturated monocarboxylic acids having 2 to 24 C atoms, diesters of maleic acid or fumaric acid with monohydric C 1 - to C 24 -alcohols, vinyl ethers of alcohols having 3 to 24 C- Atoms or mixtures of the compounds mentioned.
  • amphiphilic copolymers contain as hydrophilic monomers (b), for example C 3 - to C 10 - monoethylenically unsaturated carboxylic acids or their anhydrides, 2-acrylamido 2-methylpropanesulfonic acid, vinylsulfonic acid, styrenesulfonic acid, vinylphosphonic acid, salts of said monomers or mixtures thereof as hydrophilic monomers copolymerized with an anionic group.
  • hydrophilic monomers (b) for example C 3 - to C 10 - monoethylenically unsaturated carboxylic acids or their anhydrides, 2-acrylamido 2-methylpropanesulfonic acid, vinylsulfonic acid, styrenesulfonic acid, vinylphosphonic acid, salts of said monomers or mixtures thereof as hydrophilic monomers copolymerized with an anionic group.
  • aqueous sizing agent dispersions containing anionic dispersant amphiphilic copolymers are particularly preferred.
  • anionic dispersants are preferably copolymers of maleic anhydride with C 4 - to C 12 olefins, more preferably C 8 olefins such as octene-1 and diisobutene. Most preferred is diisobutene.
  • the molar ratio between maleic anhydride and olefin is for example in the range 0.9: 1 to 3: 1, preferably from 0.95: 1 to 1, 5: 1.
  • These copolymers are preferably used in hydrolyzed form as aqueous solution or dispersions, wherein the anhydride group is present open and the carboxyl groups are preferably partially or completely neutralized.
  • alkali metal bases such as sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate
  • alkaline earth salts such as calcium hydroxide, calcium carbonate, magnesium hydroxide, ammonia, primary, secondary or tertiary amines, such as triethylamine, triethanolamine, diethanolamine, ethanolamine, morpholine etc.
  • amphiphilic copolymers in the form of the free acid are not sufficiently water-soluble, they are used in the form of water-soluble salts, for example using the corresponding alkali metal, alkaline earth metal and ammonium salts.
  • the molecular weight M w of the amphiphilic copolymers is, for example, 800 to 250,000, usually 1,000 to 100,000, and is preferably in the range from 3,000 to 20,000, in particular from 1,500 to 10,000.
  • the acid numbers of the amphiphilic copolymers are, for example, from 50 to 500, preferably 150 to 300 mg KOH / g polymer.
  • amphiphilic copolymers are used, for example, in amounts of from 0.05 to 20, preferably from 0.5 to 10,% by weight, based on the reactive sizing agent, of the anionic dispersant Production of sizing agent dispersions used.
  • the amphiphilic copolymers are used in amounts of 0.1 to 2, in particular 0.6 to 1 wt .-%, based on the sizing agent to be dispersed.
  • the sole use of amphiphilic copolymers as dispersants gives aqueous solvent dispersions which are formaldehyde-free and storage-stable.
  • aqueous anionic sizing dispersions may be for example an aqueous solution of at least one condensation product or at least one amphiphilic copolymer present therein at temperatures of for example 20 to 100, preferably 40 to 90 0 C disperse the sizing agents.
  • the sizing agent is preferably added in the form of a melt and dispersed with vigorous stirring or shearing. The resulting dispersion is cooled in each case. In this way it is possible, for example, to prepare aqueous, anionically adjusted sizing dispersions which contain 6 to 65% by weight of an alkyldiketene or 0.1 to 65% by weight of an alkenylsuccinic anhydride dispersed as sizing agent.
  • Further preferred sizing agent dispersions contain from 25 to 60% by weight of an alkyldiketene sizing agent and from 0.1 to 5.0% by weight of an amphiphilic copolymer
  • Such highly concentrated size dispersions have a relatively low viscosity, for example in the range of 20 to 100 mPas (measured with a Brookfield viscometer and a temperature of 2O 0 C).
  • the pH is, for example, 2 to 8, and is preferably in the range of 3 to 4.
  • An aqueous anionic sizing agent dispersion having an average sizing size in the range of 0.1 to 3 is obtained , preferably 0.5 to 1, 5 microns.
  • the anionically dispersed reactive sizing agents may additionally contain at least one cationic dispersant, but the amount of cationic dispersant must be chosen such that the total dispersion carries an anionic charge.
  • Preferred cationic dispersant is cationic starch.
  • the aqueous dispersions of a reactive sizing agent can be used together with a cationic, synthetic polymer which acts as a fixing agent and promoter, wherein fixing agent and promoter are metered in a mixture with at least one reactive sizing agent or separately therefrom.
  • these additives are also mixed in a turbulent flow with the stock.
  • the same devices can be used as for the addition of reactive sizes and retention agents.
  • the cationic polymers used as fixing agents and promoters can be metered into the paper stock, for example, before or after the last shear stage.
  • cationic polymers of this type are polymers containing vinylamine units, polymers containing vinyl guanidine units, polyethyleneimines, polyamidoamines grafted with ethyleneimine and / or polydiallyldimethylammonium chlorides.
  • the amount of cationic polymers is for example 0.001 to 2.0, preferably 0.01 to 0.1 wt .-%, based on dry pulp.
  • the cationic polymers which are used as fixing agents and as promoters are known, cf. WO-A-2004/022848, page 6, line 39 to page 12, line 24. They preferably have K-values according to Fikentscher of 50 to 135 (determined in 5% aqueous saline solution at 25 0 C, a pH of 7 and a polymer concentration of 0.5% by weight).
  • Cationic polymers preferably used as fixing agents and promoters are hydrolyzed polyvinylformamides having a degree of hydrolysis of, for example, from 5 to 100% and polyethyleneimines.
  • the dewatering of the paper stock is carried out according to the invention, in the presence of at least one reactive sizing agent and at least one retention agent.
  • at least one reactive sizing agent in addition to anionic retention aids or nonionic retention aids such as polyacrylamides, cationic polymers are preferably used as retention aids and as dehydrating agents. This achieves a significant improvement in the runnability of the paper machine.
  • the retention agents have a higher molecular weight. For example, they have Fikentscher K values of at least 140, usually from 170 to 300 (determined in 5% strength aqueous sodium chloride solution at 25 ° C., a polymer concentration of 0.5% by weight and a pH of 7 ). They are preferably used in amounts of from 0.01 to 0.03% by weight, based on dry paper stock.
  • Suitable retention agents are all polymers which are commercially available for this purpose, in particular cationic polyacrylamides, polydiallyldimethylammonium chlorides, high molecular weight polyvinylamines, polyethyleneimines, polyamines having a molecular weight of more than 50,000, modified polyamines grafted with ethyleneimine and optionally crosslinked, polyetheramides, polyvinylimidazoles, polyvinylpyrrolidines, polyvinylimidazolines, polyvinyltetrahydropyrines, poly (dialkylaminoalkylvinyl ethers), poly (dialkylaminoalkyl (meth) acrylates) in protonated or in quaternized form and polyamidoamines of a dicarboxylic acid such as adipic acid and polyalkylenepolyamines such as diethylenetriamine grafted with ethyleneimine and cross-linked with polyethylene glycol dichlorohydrin ethers according to the teaching of DE-B-24 34
  • microparticle systems consisting of a polymeric retention agent with a molecular weight M w of at least 1 million, preferably at least 2 million, and a finely divided inorganic or organic component.
  • M w molecular weight of at least 1 million, preferably at least 2 million
  • finely divided inorganic or organic component Such systems are known, cf.
  • suitable organic components of the microparticle system are retention aids selected from the group consisting of vinylamine units, polymers containing vinylguanidine units, nonionic, cationic and anionic polyacrylamides, polyethyleneimines, ethyleneimine-grafted, crosslinked polyamidoamines, cationic starches and polydiallyldimethylammonium chlorides ,
  • the retention aid of the microparticle system may be cationic, anionic, amphoteric or nonionic.
  • At least one polymer from the group of nonionic polyacrylamides, the nonionic polymethacrylamides, the cationic polyacrylamides, the cationic polymethacrylamides, the anionic polyacrylamides, the anionic polymethacrylamide, the poly (N-vinylformamide), and the vinylamine units contains, for example, as the polymeric, synthetic retention aid Polymers and the Polydiallyldimethylammoniumchloride into consideration.
  • the average molecular weight M w of the polymeric retention aids is preferably at least 2 million daltons, in particular at least 3 million, and is usually in the range of, for example, 3.5 million to 15 million.
  • the charge density of the polymers in question is, for example, at most 4.0 meq./g.
  • cationic polyacrylamides having an average molecular weight M w of at least 5 million daltons and a charge density of 0.1 to 3.5 meq./g and polyvinylamines obtainable by hydrolysis of vinylformamide units containing polymers and having an average molecular weight of at least Have 2 million daltons.
  • the polyvinylamines are preferably obtained by hydrolysis of homopolyamines. mers of N-vinylformamide produced, wherein the degree of hydrolysis, for example, up to 100%, usually 70 to 95%.
  • High molecular weight copolymers of N-vinylformamide with other ethylenically unsaturated monomers such as vinyl acetate, vinyl propionate, methyl acrylate, methyl methacrylate, acrylamide, acrylonitrile and / or methacrylonitrile can also be hydrolyzed to give polymers containing vinylamine units and used according to the invention.
  • all polyvinylamines having a molecular weight M w of at least 2 million can be used according to the invention, which are obtainable by hydrolysis of vinylformamide units-containing polymers, the degree of hydrolysis of the vinylformamide units being 0.5 to 100 mol%.
  • the preparation of homopolymers and copolymers of N-vinylformamide is known. It is described in detail in, for example, US Pat. No. 6,132,558, column 2, line 36 to column 5, line 25. The statements made there are hereby incorporated by reference into the disclosure content of the present application.
  • Cationic polyacrylamides are, for example, copolymers prepared by copolymerizing acrylamide and at least one di-C 1 -C 2 -alkylamino-C 2 -bisC 4 -alkyl (meth) acrylate or a basic acrylamide in the form of the free bases, the salts with organic or inorganic acids or the compounds quaternized with alkyl halides.
  • Examples of such compounds are dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminopropyl methacrylate, dimethylaminopropyl acrylate, diethylaminopropyl methacrylate, diethylaminopropyl acrylate and / or dimethylaminoethylacrylamide, dimethylaminoethylmethacrylamide, dimethylaminopropylacrylamide, dimethylaminopropylmethacrylamide and / or diallyldimethylammonium chloride.
  • comonomers mentioned can also be copolymerized with methacrylamide to form cationic polymethacrylamides containing, for example, from 5 to 40 mol% of at least one cationic monomer, such as dimethylaminoethyl acrylate or diallyldimethylammonium chloride, in copolymerized form.
  • Cationic polymethacrylamide can also be used as a polymeric retention agent of the microparticle system.
  • polymers containing cationic polyacrylamides and vinylamine units can be found, for example, in the references such as EP-A-0 910 701 and US Pat. No. 6,103,065.
  • Such polymers are commercial products.
  • Branched polymers e.g. can be prepared by copolymerization of acrylamide or methacrylamide with at least one cationic monomer in the presence of small amounts of crosslinking agents, for example, in the references cited in the prior art US Pat. No. 5,393,381, WO-A-99/66130 and WO-A-99 / 63159 described.
  • cationic polymeric retention aids of the microparticle system are polydiallyldimethylammonium chlorides (polyDADMAC) with an average molecular weight. at least 2 million daltons. Polymers of this type are commercial products. Preferably used polymers of the microparticle system are cationic polyacrylamides, vinylamine units containing polymers and mixtures thereof, wherein the molecular weights M w of the polymers amount to at least 2 million.
  • polyDADMAC polydiallyldimethylammonium chlorides
  • the polymeric retention aids of the microparticle system are added to the paper stock, for example, in an amount of 0.005 to 0.5% by weight, preferably in an amount of 0.01 to 0.25% by weight, based on dry paper stock.
  • Benetonit, colloidal silicic acid, silicates and / or calcium carbonate may be considered as an inorganic component of the microparticle system.
  • Colloidal silicic acid is to be understood as meaning products based on silicates, for example silica microgel, silical sol, polysilicates, aluminum silicates, boron silicates, polyboron silicates, clay or zeolites.
  • Calcium carbonate can be used, for example, in the form of chalk, ground calcium carbonate or precipitated calcium carbonate as the inorganic component of the microparticle system.
  • Bentonite is generally understood to be phyllosilicates which are swellable in water.
  • clay mineral montmorillonite and similar clay minerals such as nontronite, hectorite, saponite, sauconite, beidellite, allevardite, illite, halloysite, attapulgite and sepiolite.
  • These phyllosilicates are preferably activated before use, ie converted into a water-swellable form in which the phyllosilicates are treated with an aqueous base such as aqueous solutions of caustic soda, potassium hydroxide, soda, potash, ammonia or amines. Bentonite in the form treated with sodium hydroxide solution is preferably used as the inorganic component of the microparticle system.
  • the platelet diameter of the water-dispersed bentonite is in the group treated with Natromlauge form, for example 1 to 2 microns, the thickness of the flakes is nm at about first depending on the type and activation has the bentonite has a specific O- ber Assembly 60-800 m 2 / G.
  • Typical bentonites are described, for example, in EP-B-0235893.
  • bentonite is added to the cellulosic suspension, typically in the form of an aqueous bentonite slurry. This bentonite slurry may contain up to 10% by weight of bentonite. Normally, the slurries contain about 3 to 5 wt .-% bentonite.
  • colloidal silica products from the group of silicon-based particles, silica microgels, silica sols, aluminum silicates, borosilicates, polyborosilicates or zeolites can be used. These have a specific surface area of 50 to 1000 m 2 / g and an average particle size distribution of 1 - 250 nm, usually in the range 40 - 100 nm. The preparation of such components is described, for example, in EP-AO 041 056, EP-AO 185 068 and US-A-5,176,691.
  • Clay or kaolin is a hydrous aluminum silicate with a platelet-like structure.
  • the crystals have a layer structure and an aspect ratio Diameter to thickness) of up to 30: 1.
  • the particle size is for example at least 50% less than 2 microns.
  • Carbonates used are preferably natural calcium carbonate (ground calcium carbo- nate, GCC) or precipitated calcium carbonate (PCC).
  • GCC is produced, for example, by grinding and visual processes using grinding aids. It has a particle size of 40 - 95% less than 2 microns, the specific surface area is in the range of 6 - 13 m 2 / g.
  • PCC is made by passing carbon dioxide into an aqueous calcium hydroxide solution. The average particle size is in the range of 0.03-0.6 ⁇ m.
  • the specific surface area can be greatly influenced by the choice of precipitation conditions. It is in the range of 6 to 13 m 2 / g.
  • the inorganic component of the microparticle system is added to the paper stock in an amount of 0.01 to 2.0% by weight, preferably in an amount of 0.1 to 1.0% by weight, based on dry paper stock.
  • microparticle system also combinations of an organic polymer having a molecular weight M w of at least 2 million and a mixture of a finely divided inorganic component and a finely divided organic component, wherein both components are metered independently of one another either simultaneously or in succession.
  • a suitable finely divided organic component having an anionic charge is described, for example, in WO-A-98/29604.
  • At least one finely divided crosslinked copolymer of acrylamide and at least one monoethylenically unsaturated anionic monomer is preferably used as finely divided, organic component of the microparticle system.
  • microparticle systems are combinations of cationic polymers such as cationic starch and finely divided silica or of cationic polymers such as cationic polyacrylamide and bentonite.
  • Paper stock is dewatered on a sieve with formation of sheets.
  • the leaves thus produced are dried.
  • Dewatering the stock and drying the sheets are part of the papermaking process and are performed continuously in the art.
  • the advantage of the process according to the invention is that reactive sizes, retention aids and optionally xierstoff and other process aids used in the optimum for the respective substances residence time in the pulp and thus the maximum possible with these substances effect such as sizing grade of the paper and retention of fillers can achieve.

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Abstract

L'invention concerne un procédé pour le collage en pile de papier, carton-pâte et carton, par adjonction continue et successive d'une dispersion aqueuse d'au moins une colle réactive et d'au moins un agent de rétention à un flux de pâte à papier à écoulement laminaire présentant une concentration de pâte d'au maximum 2 % en poids par rapport aux fibres sèches, et par égouttage de la pâte à papier pour former la feuille. Selon ce procédé, on dose la colle réactive et l'agent de rétention dans un écoulement turbulent en un point dans le flux de pâte à papier qui est situé après le dernier étage de cisaillement et avant le début du processus de déshydratation.
PCT/EP2005/013625 2004-12-22 2005-12-17 Procede pour le collage en pile de papier Ceased WO2006069657A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004063000.3 2004-12-22
DE200410063000 DE102004063000A1 (de) 2004-12-22 2004-12-22 Verfahren zur Masseleimung von Papier

Publications (2)

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WO2006069657A2 true WO2006069657A2 (fr) 2006-07-06
WO2006069657A3 WO2006069657A3 (fr) 2007-04-26

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PCT/EP2005/013625 Ceased WO2006069657A2 (fr) 2004-12-22 2005-12-17 Procede pour le collage en pile de papier

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DE (1) DE102004063000A1 (fr)
WO (1) WO2006069657A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9750444B2 (en) 2009-09-30 2017-09-05 Abbott Diabetes Care Inc. Interconnect for on-body analyte monitoring device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100000693A1 (en) * 2006-10-31 2010-01-07 Basf Se Method for producing a multi layer fiber web from cellulose fibers

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872039A (en) * 1974-02-01 1975-03-18 Dow Chemical Co Cellulosic materials internally sized with low molecular weight copolymers of alpha, beta-ethylenically unsaturated hydrophobic monomers and ammoniated carboxylic acid comonomers
GB8602121D0 (en) * 1986-01-29 1986-03-05 Allied Colloids Ltd Paper & paper board
FI108802B (fi) * 1998-02-26 2002-03-28 Wetend Technologies Oy Menetelmä ja laite kemikaalin syöttämiseksi nestevirtaan sekä paperikoneen syöttöjärjestelmä
DE10225702A1 (de) * 2002-06-10 2003-12-18 Basf Ag Verfahren und Vorrichtung zum Messen der Retention zumindest eines Zusatzstoffes an einer Fasersuspension

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9750444B2 (en) 2009-09-30 2017-09-05 Abbott Diabetes Care Inc. Interconnect for on-body analyte monitoring device
US10765351B2 (en) 2009-09-30 2020-09-08 Abbott Diabetes Care Inc. Interconnect for on-body analyte monitoring device
US11259725B2 (en) 2009-09-30 2022-03-01 Abbott Diabetes Care Inc. Interconnect for on-body analyte monitoring device
US12605092B2 (en) 2009-09-30 2026-04-21 Abbott Diabetes Care Inc. Interconnect for on-body analyte monitoring device

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WO2006069657A3 (fr) 2007-04-26

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