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EP1792010A1 - Procede de fabrication de papier et de carton - Google Patents

Procede de fabrication de papier et de carton

Info

Publication number
EP1792010A1
EP1792010A1 EP05783030A EP05783030A EP1792010A1 EP 1792010 A1 EP1792010 A1 EP 1792010A1 EP 05783030 A EP05783030 A EP 05783030A EP 05783030 A EP05783030 A EP 05783030A EP 1792010 A1 EP1792010 A1 EP 1792010A1
Authority
EP
European Patent Office
Prior art keywords
cationic
paper
million
weight
molecular weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05783030A
Other languages
German (de)
English (en)
Other versions
EP1792010B1 (fr
Inventor
Marc Leduc
Rainer Blum
Peter Leifert
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of EP1792010A1 publication Critical patent/EP1792010A1/fr
Application granted granted Critical
Publication of EP1792010B1 publication Critical patent/EP1792010B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/76—Processes or apparatus for adding material to the pulp or to the paper characterised by choice of auxiliary compounds which are added separately from at least one other compound, e.g. to improve the incorporation of the latter or to obtain an enhanced combined effect
    • D21H23/765—Addition of all compounds to the pulp

Definitions

  • the invention relates to a process for the production of paper, paperboard and cardboard by dewatering a paper stock on a wire in the presence of at least one polymer as a retention agent with sheet formation and drying of the sheets.
  • US Pat. No. 4,421,602 discloses the use of partially hydrolyzed homopolymers of N-vinylformamide as retention, drainage and flocculation agents in the production of paper.
  • the K value of the hydrolyzed poly mers of N-vinylformamide is at most 150 (measured in 5% aqueous sodium chloride solution at a polymer concentration of 0.5 wt .-% and a temperature of 25 0 C) corresponding to a molecular weight M w of approx 900,000.
  • retention aids are, for example, polyamidoamines obtainable by condensation of adipic acid and diethylenetriamine, grafting of the condensation products with ethyleneimine and crosslinking of the reaction products thus obtainable with bischlorohydrin ethers of polyethylene glycols, high molecular weight polyethyleneimines, high molecular weight polyacrylamides and copolymers of acrylamide and dimethylaminoethyl acrylate -methochloride having a molecular weight M w of at least 3 Millio ⁇ NEN, see. Examples of EP-A 438 707.
  • the deposition of contaminants in the paper machine is e.g. on metallic surfaces, screening and felts by adding to the stock a water-soluble copolymer containing at least 5% by mole of an N-vinylcarboxamide or a hydrolyzate thereof.
  • the degree of hydrolysis of the N-vinylcarboxamides is, according to the information in the examples, from 5 to 20 mol%.
  • the retention agents used are various combinations of polymers and a finely divided, inorganic solid, such as bentonite, which acts as flocculant. nit, colloidal silica or silica.
  • bentonite a finely divided, inorganic solid
  • nit colloidal silica or silica.
  • a paper material initially a synthetic cationic African polymer having a molecular weight of more than 500,000 in an amount of more than 0.03 wt .-%, based on dry pulp, to form flakes zu ⁇ set, which are then cut in a subsequent shearing step to microflakes. Then bentonite is then added and the resulting paper pulp is dewatered under Blattbil ⁇ .
  • the pulp is successively mixed with two different water-soluble, cationic polymers, namely a fixing agent and a retention agent, then subjected to at least one shear stage and then treated with bentonite. Only then is the drainage of the pulp under sheet formation.
  • EP-A 910 701 describes a process for the production of paper and board, wherein a low molecular weight or medium molecular weight cationic polymer based on polyethylenimine or polyvinylamine and subsequently with a high molecular weight cationic polymer, such as polyacrylamide, polythiol, is successively added to the paper pulp vinylamine or cationic starch. After this pulp has been subjected to at least one shear stage, it is flocculated by addition of bentonite and the pulp is dewatered.
  • a low molecular weight or medium molecular weight cationic polymer based on polyethylenimine or polyvinylamine and subsequently with a high molecular weight cationic polymer, such as polyacrylamide, polythiol
  • EP-A 608 986 It is known from EP-A 608 986 that a cationic retention agent is metered into the thick stock in papermaking.
  • a further process for the production of paper and paperboard is known from US Pat. No. 5,393,381, WO 99/66130 and WO 99/63159, which also teaches a microparticle system composed of a cationic polymer and bentonite used.
  • the cationic polymer used is a water-soluble, branched polyacrylamide.
  • WO 01/34910 describes a process for the production of paper in which a polysaccharide or a synthetic, high molecular weight polymer is metered into the paper stock suspension. Subsequently, a mechanical shear of the pulp must take place. The reflocculation is carried out by dosing an inorganic component such as silica, bentonite or clay and a water-soluble polymer.
  • an inorganic component such as silica, bentonite or clay and a water-soluble polymer.
  • US Pat. No. 6,103,065 discloses a process for improving the retention and the removal of debris from paper materials, in which a cationic polymer having a molecular weight of 100,000 to 2 million and a charge density of more than 4 is added to a paper stock after the last shearing , 0 meq./g, simultaneously or after adding a polymer having a molecular weight of at least 2 million and a charge density of less than 4.0 meq./g and then dosed bentonite. It is not necessary in this method to shear the stock after the addition of the polymers. After addition of the polymers and the bentonite, the pulp can be dewatered without further action of shear forces to form sheets.
  • WO 04/15200 likewise discloses a microparticle system comprising a cationic polymer and a finely divided inorganic component as retention agent in the production of paper.
  • Suitable cationic polymers are, for example, cationic polyacrylamides, polymers comprising vinylamine units and / or polydiallyldimethylammonium chloride having an average molecular weight M w of at least 500 000 and a charge density of at most 4.0 meq / g.
  • microparticle systems described above are technically complicated because special devices are required for the metering of the finely divided inorganic flocculants.
  • the object is achieved in accordance with the invention by a process for the production of paper, paperboard and paperboard by dewatering a paper stock on a wire in the presence of at least one polymer as a retention agent with formation of sheets and drying of the sheets, if the sheet formation is in the absence of finely divided inorganic Flocculants and as a retention agent (a) polymers containing vinylamine units and / or polyvinylformamide having a molecular weight M w of at least 1 million each
  • Vinylamine-containing polymers and / or polyvinylformamide having a molar mass M w of at least 1 million are known. They are prepared, for example, by homopolymerization of N-vinylformamide to poly-N-vinylformamide or by copolymerizing N-vinylformamide with at least one other ethylenically unsaturated monomer and subsequent hydrolysis of the copolymerized vinylformamide units to vinylamine units.
  • Preferred polymers containing vinylamine units are the cationic polymers obtainable by hydrolysis of poly-N-vinylformamides. The degree of hydrolysis of these polymers is for example 0.5 to 100%, preferably 1 to 50% and is usually in the range of 2 to 40, in particular from 2 to 30%.
  • the polymers of component (a) have for example a charge density (determined at pH 7) of 0 to 18 meq / g, preferably 0.1 to 7 meq / g and in particular from 0.2 to 4 meq / g.
  • a charge density determined at pH 7
  • the vinylamine units containing polymers and poly-N-vinylformamide the
  • Component (a) of the retention agent preferably has a molecular weight M w of at least 1.2 million.
  • M w molecular weight of at least 1.2 million.
  • Component (a) can be either a vinylamine units-containing polymer or poly-N-vinylformamide alone or a mixture of polymers from the two classes of compounds. However, preference is given to polymers containing cationic vinylamine units as compounds of component (a).
  • cationic polyacrylamides As component (b) of the retention agent system, cationic polyacrylamides, nonionic polyacrylamides, cationic polymethacrylamides, nonionic polymethacrylamides and mixtures of the compounds mentioned come into consideration, if they each have a molecular weight M w of at least 3 million.
  • Polymers of this type are described in the prior art EP-A 335 575.
  • such polymers are commercially available products. They are known to be prepared by polymerizing acrylamide or methacrylamide each alone to homopolymers or by polymerizing acrylamide or methacrylamide in the presence of cationic monomers.
  • Suitable cationic monomers are, for example, the esters and amides of ethylenically unsaturated C 3 - to C 5 -carboxylic acids with amino alcohols.
  • Examples of cationic monomers are dimethylaminoethyl acrylate, diethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl methacrylate, dimethylaminopropyl acrylate, diethylaminopropyl acrylate, dimethylaminopropyl methacrylate, diethylaminopropyl methacrylate, dimethylaminoethylacrylamide, diethylaminoethylacrylamide, dimethylaminoethylmethacrylamide, diethylaminoethylmethacrylamide, dimethylaminopropylacrylamide, dimethylaminopropylmethacrylamide and diethylaminopropyl
  • the cationic monomers can be used in the copolymerization in the form of the free bases, the salts with mineral acids such as sulfuric acid, hydrochloric acid or phosphoric acid, the salts with organic acids such as formic acid, acetic acid, propionic acid, benzenesulfonic acid or p-toluenesulfonic acid and / or in quaternized Form are used.
  • Quatem istsstoff come for example Cr to C
  • the cationic polyacrylamides or the cationic polymethacrylamides contain, for example, copolymerized 5 to 40 mol%, preferably 7 to 30 mol% of at least one cationic monomer.
  • the molecular weights of the cationic polymers and those of the nonionic polymers are at least 2.5 million, preferably at least 3 million, and are usually in the range of 5 million to 15 million.
  • Hydrolysis degree of vinylformamide units is 0.5 to 100%
  • the retention agent contains in particular as a component
  • the cationic polyacrylamides and the cationic polymethacrylamides preferably contain copolymerized as cationic monomer dimethylaminoethyl acrylate methochloride or dimethylaminoethylacrylamide methochloride. These methochlorides are readily accessible by alkylation of dimethylaminoethyl acrylate or of dimethylaminoethyl acrylamide with methyl chloride.
  • the components (a) and (b) of the retention agent are added to the paper stock, based on dry paper stock, in an amount of
  • the retention agent may be added to the paper stock - as a rule the metering of the retention agent is carried out according to the invention in the thin material - for example in the form of a mixture of components (a) and (b).
  • the component (a) and then the component (b) first, for example, after the last shear stage in front of the headbox.
  • both components can also be introduced into the thin material separately from one another before or after a shear stage.
  • At least one compound of component (a) is first metered, followed by at least one compound. fertil the component (b).
  • the compound of component (a) can be supplied to the paper stock before the headbox example before a shear stage and the compound of component (b) after the last shear stage before the headbox.
  • both Verbindun ⁇ conditions can be dosed before the last shear stage before the headbox or after the last stage before the headbox for pulp.
  • a cationic polyacrylamide is preferably used as the compound of component (b), while if component (a) is selected as a vinylamine polymer-containing polymer, the use of a cationic polyacrylamide or a cationic one is preferred Polymethyacrylamids preferred, but then you can also as component (b) a nonionic polyacrylamide and / or a nonionic Polymethacrylamid einset ⁇ zen.
  • the invention is also the use of combinations of
  • all paper grades, paperboard and cardboard can be produced, for example papers for newspaper printing, so-called medium-fine writing and printing papers, natural gravure papers and also lightweight coating base papers.
  • wood pulp, thermo-mechanical pulp (TMP), chemo-thermo-mechanical pulp (CTMP), pressure pulp (PGW) and sulphite and sulphate pulp can be used.
  • TMP thermo-mechanical pulp
  • CMP chemo-thermo-mechanical pulp
  • PGW pressure pulp
  • sulphite and sulphate pulp can be used.
  • Pulp and zeolite are mainly used in the so-called integrated paper mills in more or less less moist form directly without prior thickening or drying further processed into paper. Due to the impurities not completely removed from them, these fiber materials still contain substances which severely disturb the usual papermaking process. If such pulps are used, it is advisable to work in the presence of a fixative.
  • both unfilled and filler-containing papers can be produced.
  • the filler content in the paper can be up to a maximum of 40% by weight and is preferably in the range from 5 to 30% by weight.
  • Suitable fillers are, for example, clay, kaolin, native and precipitated circles, titanium dioxide, talc, calcium sulfate, barium sulfate, aluminum oxide, satin white or mixtures of the stated fillers.
  • the papermaking can be carried out in the presence of the usual process chemicals in the usual amounts, e.g. of engine sizing agents such as, in particular, alkyldiketene dispersions, rosin size, alkenylsuccinimide dispersions or adhesive polymer dispersions, solidifying agents such as polyamidoamines crosslinked with epichlorohydrin, polyvinylamines of average molecular weight or strength, fixing agents, biocides, dyes and fillers.
  • engine sizing agents such as, in particular, alkyldiketene dispersions, rosin size, alkenylsuccinimide dispersions or adhesive polymer dispersions, solidifying agents such as polyamidoamines crosslinked with epichlorohydrin, polyvinylamines of average molecular weight or strength, fixing agents, biocides, dyes and fillers.
  • engine sizing agents such as, in particular, alkyldiketene dispersions, rosin size, alkenyls
  • the process of the invention gives, compared to the products which are prepared by known processes, papers having an improved formation, an improved filler distribution, a better opacity and an improved printability.
  • the process according to the invention is simpler to carry out than the microparticle processes and results in improved filler retention and formation compared with the prior art.
  • the percentages for the starting materials always mean weight percent.
  • the molar masses Mw of the polymers were determined by means of the static light scattering.
  • the drainage time was determined by dewatering a sample of the stock in a Schopper-Riegler tester and determining the time in seconds within the 300 ml of filtrate.
  • Ash retention was determined by calculating the difference between the ash concentration of the paper stock in the headbox and the ash concentration in the white water divided by the ash concentration of the paper stock in the headbox and multiplying by 100. It is reported as a percentage.
  • Formation evaluation on-line formation index was performed by measuring the sheets to be tested using Measure IT Optical Properties Measurement OP 4255 (formation sensor from ABB). The lower the measured value, the better the formation.
  • PVAm 1 polyvinylamine with a molecular weight M w of 1.2 million and a charge density of 3.0 meq / g
  • PAM 1 copolymer of 70% by weight of acrylamide and 30% by weight of dimethylaminoethyl acrylate methochloride having a molecular weight M w of 8 million and a charge density of 1.7 meq / g
  • the bentonite used had been activated with aqueous sodium carbonate solution.
  • Example 1 and Comparative Examples 1 dehydrated to 3 specified Zu ⁇ additives.
  • the solids content of the white water was always 0.55%.
  • the filler content of the paper was 30%.
  • the paper had a basis weight of 52-56 g / m 2 .
  • PAM 1 was metered after the last shear stage and before the headbox.
  • the drainage time of this stock was 41 seconds, the ash retention 36% and the index for the formation 7.4.
  • PVAm 1 0.05% PVAm 1 was metered to the stock described above after the last shear stage in front of the headbox.
  • the drainage time of this stock was 38 seconds, the ash retention 39% and the index for the formation 6.4.

Landscapes

  • Paper (AREA)

Abstract

Procédé de fabrication de papier et de carton par égouttage d'une pâte à papier sur un tamis, des feuilles étant formées, et par séchage desdites feuilles. La formation de feuilles est effectuée en l'absence d'agents floculants inorganiques à particules fines. L'agent de rétention utilisé contient (a) des polymères contenant des unités vinylamine et / ou du polyvinylformamide ayant chacun une masse molaire Mw d'au moins 1 million et (b) au moins un polyacrylamide cationique ou non ionique et / ou un polyméthacrylamide cationique ou non ionique ayant chacun une masse molaire Mw d'au moins 2,5 millions.
EP05783030.9A 2004-09-10 2005-09-08 Procede de fabrication de papier et de carton Expired - Lifetime EP1792010B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004044379A DE102004044379B4 (de) 2004-09-10 2004-09-10 Verfahren zur Herstellung von Papier, Pappe und Karton und Verwendung einer Retentionsmittelkombination
PCT/EP2005/009653 WO2006027242A1 (fr) 2004-09-10 2005-09-08 Procede de fabrication de papier et de carton

Publications (2)

Publication Number Publication Date
EP1792010A1 true EP1792010A1 (fr) 2007-06-06
EP1792010B1 EP1792010B1 (fr) 2015-11-11

Family

ID=35197730

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05783030.9A Expired - Lifetime EP1792010B1 (fr) 2004-09-10 2005-09-08 Procede de fabrication de papier et de carton

Country Status (6)

Country Link
US (1) US8029647B2 (fr)
EP (1) EP1792010B1 (fr)
CN (1) CN101014741B (fr)
CA (1) CA2576611C (fr)
DE (1) DE102004044379B4 (fr)
WO (1) WO2006027242A1 (fr)

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DE10322787A1 (de) * 2003-05-19 2004-12-09 Basf Ag Verfahren zur Herstellung von Polymerpulvern

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Also Published As

Publication number Publication date
EP1792010B1 (fr) 2015-11-11
CA2576611C (fr) 2014-12-23
DE102004044379B4 (de) 2008-01-10
US20080000601A1 (en) 2008-01-03
US8029647B2 (en) 2011-10-04
CN101014741B (zh) 2010-05-26
DE102004044379A1 (de) 2006-03-30
CN101014741A (zh) 2007-08-08
CA2576611A1 (fr) 2006-03-16
WO2006027242A1 (fr) 2006-03-16

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