EP0588767B1 - Verfahren zur Verbesserung von Weissgrad, Helligkeit und Farbort von Holzfaserstoffen - Google Patents

Verfahren zur Verbesserung von Weissgrad, Helligkeit und Farbort von Holzfaserstoffen Download PDF

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Publication number
EP0588767B1
EP0588767B1 EP93810632A EP93810632A EP0588767B1 EP 0588767 B1 EP0588767 B1 EP 0588767B1 EP 93810632 A EP93810632 A EP 93810632A EP 93810632 A EP93810632 A EP 93810632A EP 0588767 B1 EP0588767 B1 EP 0588767B1
Authority
EP
European Patent Office
Prior art keywords
process according
paper making
making fibres
mixture
paper
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.)
Expired - Lifetime
Application number
EP93810632A
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German (de)
English (en)
French (fr)
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EP0588767A1 (de
Inventor
Axel Dr. Von Raven
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 Schweiz AG
Original Assignee
Ciba Geigy AG
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 Ciba Geigy AG filed Critical Ciba Geigy AG
Publication of EP0588767A1 publication Critical patent/EP0588767A1/de
Application granted granted Critical
Publication of EP0588767B1 publication Critical patent/EP0588767B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/60—Optical bleaching or brightening
    • D06L4/657—Optical bleaching or brightening combined with other treatments, e.g. finishing, bleaching, softening, dyeing or pigment printing
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/60—Optical bleaching or brightening
    • D06L4/686—Fugitive optical brightening; Discharge of optical brighteners in discharge paste; Blueing; Differential optical brightening
    • D06L4/693—Blueing with mixtures of dyes; Blueing with mixtures of dyes and optical brighteners
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/22—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using vat dyestuffs including indigo
    • D06P1/26—Phthalocyanine dyes
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
    • D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
    • D06P1/46—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing natural macromolecular substances or derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1036—Use of compounds accelerating or improving the efficiency of the processes

Definitions

  • the invention relates to the addition of water-soluble phthalocyanines as photosensitizing compounds to wood fiber materials and their mixtures to improve their whiteness, brightness and color location; as well as the resulting wood fiber materials and their use.
  • wood fiber materials e.g. Wood pulp and pulp understood.
  • the bleaching required to increase the degree of whiteness is an essential process step which determines the quality of the pulp and thus also of the finished product.
  • Lignins, lignin-like phenols and extract substances as well as their breakdown products are mainly responsible for the brownish-yellow color of the unbleached wood pulp. All of these compounds form chromophoric systems due to the presence of conjugated double bonds and auxochromic groups.
  • wood fiber materials also have a more or less strong yellowness index. If you want to reduce a yellow tinge of wood fiber to get to the required color locus, you have to add a blue dye, with a red tint a greenish-blue dye etc. By adding such dyes there is a certain decrease in the degree of whiteness, but above all a very sharp drop in brightness.
  • the invention now relates to a process for improving the whiteness, brightness and color locus of wood fiber materials or their mixtures by adding water-soluble phthalocyanines as photoactivators.
  • the photoactivator or a mixture of photoactivators is preferably used, optionally in the presence of further auxiliaries, such as surface-active auxiliaries, e.g. Dodecyl sulfate, complexing agents, e.g. Phosphates and fillers, e.g. Zeolites, as well as the fibrous materials or their mixtures, mixed intensively with water.
  • auxiliaries such as surface-active auxiliaries, e.g. Dodecyl sulfate, complexing agents, e.g. Phosphates and fillers, e.g. Zeolites, as well as the fibrous materials or their mixtures, mixed intensively with water.
  • Mixing is preferably carried out intensively at 10 to 90 ° C. and particularly preferably at 20 to 85 ° C. for more than half an hour, preferably for 1 to 4 hours, in order to obtain thorough mixing with the oxygen in the air.
  • the pH of the suspension is preferably from 7.0 to 11.
  • the mixing can be carried out
  • the proportion of photoactivator is generally 0.0001 to 0.1% and preferably 0.0005 to 0.03%, based on the amount of wood fiber used.
  • the suspension of the catalytically bleached wood fiber materials obtained in this way can then be dried, but, in this form, can also be processed immediately.
  • An additional advantage of the method according to the invention lies in the improved strength of the bleached fiber materials.
  • the catalytic sequence of the process is also advantageous, the photoactivator (catalyst), due to its remaining in the wood fiber materials, from yellowing again prevented. So it makes sense to combine the photoactivators with conventional bleaching processes.
  • the photoactivators can be added before, during or after the conventional bleaching process. For practical reasons, bleach and photoactivator are preferably used simultaneously.
  • the wood fiber materials bleached by the process according to the invention accordingly not only have an improvement in whiteness, brightness and color locus, but also a lower tendency to yellowing and an improved strength.
  • the water-soluble phthalocyanines such as e.g. the phthalocyanine metal complexes of aluminum, zinc, manganese, magnesium, calcium, iron, sodium or potassium are used. These compounds can be used individually or as mixtures.
  • the photoactivators used and their preparation are generally known and are used in part in the bleaching of textiles (GB-A-1 372 036, US-A-3 927 967, DE-A-2 613 936, DE-A-2 812 278) used. In contrast to those described there
  • the wood fiber materials that can be used in this process are e.g. Pulp, wood pulp, waste paper or their mixtures.
  • wood pulp are cut (GW), pressure cut (PGW), refiner (RMP), thermomechanical (TMP) and chemical thermomechanical (CTMP).
  • the invention further relates to the wood fiber materials and their mixtures treated with the method according to the invention, and to their use in the pulp industry and in particular in paper production.
  • the invention also relates to the papers produced from the wood fiber materials treated with the process according to the invention.
  • the wood fiber materials and their mixtures obtained in this way are used in the pulp and especially in the paper industry. You can do this with other components such as optical brighteners; Binders such as latex, acrylic acid or styrene polymers or their copolymers; Fillers and other auxiliaries such as polyethylene glycol or glycol ethers can be mixed.
  • otro refers to the dry weight of the fiber in grams.
  • a quantity of the fibrous material specified in Table 1 is weighed into a 1 liter polyethylene screw-top bottle, which corresponds to 3.0 otro (56.6 g A; 200 g B). After adding 500 ml of dist.
  • the other auxiliaries according to Table 1 are metered into water and, if necessary, the pH is adjusted with sodium hydroxide solution.
  • the screw-top bottles are closed and the mixtures (with the exception of the zero tests) are shaken vigorously for one hour on a shaker.
  • a pH of 6.0 is set, if indicated, with sulfuric acid.
  • Paper sheets are produced from the mixtures after dilution to 3l (experiments 1-8) or 7l (experiments 9-20) on the Rapid-Köthen sheet former and after drying (7 min. At 95 ° C) the whiteness, with a Device that meets the requirements of DIN 53145 Part 1.
  • the corresponding manganese compound can also be used.
  • Table 2 Experiment No. 1 day after production 4 weeks without light 5 days of sunlight 10 days of sunlight Difference 1 day - 10 days 1 66.80 66.20 64.80 63.25 3.55 2nd 67.90 67.70 66.35 65.75 2.15 4th 67.85 - 65.70 64.65 3.2 7 67.86 - 65.90 65.10 2.76 11 68.01 68.00 66.55 65.20 2.81 14 88.2 86.6 86.5 1.7 16 88.7 87.7 87.4 1.3 19th 88.9 87.6 87.4 1.5
  • Bag bleaching is carried out with 50 otro wood pulp (SGW) (consistency approx. 20%).
  • SGW otro wood pulp
  • the wood pulp is sprayed with the chemicals listed in Table 3 with constant mixing at 70 ° C from a spray bottle for 2 hours at pH 7.5.
  • the amount of the respective fiber material is weighed into a 1 liter polyethylene bottle, which corresponds to 6.0 otro (30.2 g A; 30.7 g B). After adding 800 ml of dist. The auxiliaries are metered into water in accordance with the amounts given in Table 4. The mixtures obtained are stirred vigorously at room temperature for about 4 hours (except for zero tests).
  • Paper sheets are formed from the mixtures on the Rapid-Köthen sheet former and, after drying (7 minutes at 95 ° C), the degree of whiteness is determined using a device that meets the requirements of DIN 53145 Part 1.
  • Table 4 Experiment No. Fiber Photoactivator [ml 0.1% solution] Rawesol® [% based on otro] Whiteness [%] (2) (3) 1 A - - - 60.4 2nd B - - - 60.8 3rd A 0.5 - - 60.8 4th A 1.0 - - 63.0 5 A 1.5 - - 63.4 6 A 1.0 - 0.2 63.4 7 A - 1.0 - 63.7 8th A - 2.0 - 63.5 9 B 0.5 - - 62.5 10th B 1.0 - - 62.0 11 B 1.0 - 0.2 62.3 12th B - 1.0 - 62.2
  • Fibrous A thermomechanical wood pulp with a dry matter content of 19.9%
  • Fibrous material B waste paper with a dry matter content of 19.5%
  • thermomechanical wood pulp (TMP) for coating base paper (consistency approx. 6%) is taken directly from industrial production and the photoactivator (2) according to table 5 is added. Each batch is made with 20 g otro thermomechanical wood pulp (TMP) at 3% consistency with constant stirring at 55 ° C.
  • Pulp samples or plates are soaked in a 0.001% solution of compound (2) for about 5 minutes and then dried at room temperature and daylight.
  • Bag bleaching is carried out with 50 otro wood pulp (TMP) each.
  • TMP otro wood pulp
  • the wood pulp is sprayed with the bleaching solution from a spray bottle with the chemicals specified in Table 3, with constant mixing.
  • the mixture is acidified to a pH of about 7 with sulfuric acid and 80 mg of compound (2) are added per kg of wood pulp.
  • the wood pulp is diluted to 3% at a pH of 8.5.
  • Paper sheets are formed from the mixtures on the Rapid-Köthen sheet former and after drying (7 min. At 95 ° C) the degree of whiteness is determined using a device that meets the requirements of DIN 53145 Part 1.
  • the strength test of the paper sheets is determined according to Brecht-Imset (tear propagation) DIN 53115, the tear length according to DIN 53112. Table 7: without (2) with (2) Whiteness 65.2 66.4 Light reference value 81.1 80.9 Tear length [m] 2523 3345 Tear-through work [mJ / m] 925 942

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Prostheses (AREA)
  • Endoscopes (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
EP93810632A 1992-09-14 1993-09-06 Verfahren zur Verbesserung von Weissgrad, Helligkeit und Farbort von Holzfaserstoffen Expired - Lifetime EP0588767B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4230655 1992-09-14
DE4230655A DE4230655A1 (de) 1992-09-14 1992-09-14 Verfahren zur Verbesserung von Weißgrad, Helligkeit und Farbort von Faserstoffen

Publications (2)

Publication Number Publication Date
EP0588767A1 EP0588767A1 (de) 1994-03-23
EP0588767B1 true EP0588767B1 (de) 1996-06-12

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EP93810632A Expired - Lifetime EP0588767B1 (de) 1992-09-14 1993-09-06 Verfahren zur Verbesserung von Weissgrad, Helligkeit und Farbort von Holzfaserstoffen

Country Status (11)

Country Link
US (1) US5482514A (fi)
EP (1) EP0588767B1 (fi)
JP (1) JPH06207391A (fi)
AT (1) ATE139280T1 (fi)
AU (1) AU661195B2 (fi)
BR (1) BR9303764A (fi)
CA (1) CA2105922A1 (fi)
DE (2) DE4230655A1 (fi)
ES (1) ES2089777T3 (fi)
FI (1) FI933991A (fi)
MX (1) MX9305598A (fi)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19916078A1 (de) * 1999-04-09 2000-10-12 Jorax Labor Fuer Chemische Und Verfahren zur Verbesserung von Weißgrad, Helligkeit und Farbort von Faserstoffen, von anorganischen Füllstoffen und Pigmenten sowie von Bindemitteln für die Papierherstellung
DE102007036376A1 (de) * 2007-07-31 2009-02-05 Voith Patent Gmbh Gebleichter Faserstoff

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US8057637B2 (en) 2007-12-26 2011-11-15 International Paper Company Paper substrate containing a wetting agent and having improved print mottle
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19916078A1 (de) * 1999-04-09 2000-10-12 Jorax Labor Fuer Chemische Und Verfahren zur Verbesserung von Weißgrad, Helligkeit und Farbort von Faserstoffen, von anorganischen Füllstoffen und Pigmenten sowie von Bindemitteln für die Papierherstellung
DE102007036376A1 (de) * 2007-07-31 2009-02-05 Voith Patent Gmbh Gebleichter Faserstoff

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DE4230655A1 (de) 1994-03-17
AU661195B2 (en) 1995-07-13
ATE139280T1 (de) 1996-06-15
AU4731293A (en) 1994-03-24
FI933991A (fi) 1994-03-15
ES2089777T3 (es) 1996-10-01
BR9303764A (pt) 1994-04-26
MX9305598A (es) 1994-03-31
DE59302896D1 (de) 1996-07-18
US5482514A (en) 1996-01-09
FI933991A0 (fi) 1993-09-10
JPH06207391A (ja) 1994-07-26
CA2105922A1 (en) 1994-03-15
EP0588767A1 (de) 1994-03-23

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