Classifications

• • 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
  • D21C3/00—Pulping cellulose-containing materials
  • D21C3/003—Pulping cellulose-containing materials with organic compounds
• • 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
  • D21C1/00—Pretreatment of the finely-divided materials before digesting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
  • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres

Definitions

• the invention relates to a method for producing fibrous materials for the production of Pulp, paper or wood-based panels using at least one Dicarboxylic acid dialkyl ester and / or a fatty acid polyol mono, di, tri and / or higher Polyester and / or polyester-polyether copolymers and those made from these fibers manufactured products such as pulp, paper and wood-based panels.
• Fibers or fiber raw materials such as mechanical wood materials and long fiber raw materials and especially Thermo-Mechanical Pulp (TMP) or Chemi-Thermo-Mechanical Pulp (CTMP) are shredded during mechanical wood digestion by chamfering Wood materials with separation and fibrillation of the individual fibers after a thermal or chemical-thermal pretreatment (see Römpp chemistry lexicon, 9. Edition 1991, pages 3208 and 4345).
• TMP is better than ground wood for replacement of pulp and is therefore also used for cost reasons in the production of Bulk printing papers such as rotary printing paper, thin printing paper and cardboard used.
• In the production of the semi-pulp endeavors to reduce the substance content of lignin and hemicellulose by delignification and / or to reduce oxidative or reductive bleaching processes in order to prevent yellowing with them To reduce fabricated products.
• Efforts to bleach Wood pulp is used by H.U-Süss and W.Eul in the weekly for paper manufacture 9 (1986) Pp. 320- 325 reported in detail.
• DE 41 03 572 C2 is a variant the known Alcell or Organocell processes the delignification of Vegetable fiber materials, in particular wood chips, carried out in such a way that the wood chips are first continuously impregnated with alcohol to produce a Avoid fiber-damaging effects of the following alkali addition.
• WO 94/12721 and WO 94/12722 describe delignification processes using Peracetic acid and complex compounds with subsequent bleaching using ozone or Sodium dithionite described, while according to DE 195 09 401 A1 with wood pulp and Secondary fiber pulps a multi-stage peroxide bleaching is carried out under pressure, the complexing agents used compared to the effect of the perhydroxyl anion in Lignin chromophores located inside the fibers are said to improve.
• Bleaching Ligninous Materials Using Oxidizing Agents Hydroxylamine and hydroxamic acid compounds or a large number of compounds with an N-hydroxy, oxi, N-oxi or N, N'-dioxi function in EP 717 143 A1 described, wherein esters of 1-hydroxybenzotriazole, cinnamic acid and 4-tert. Butylbenzoic acid can be named as process components.
• proportions of degradation products continue to be used for fixing resins of native starch added to the wood pulp suspensions, but these are easily circulated in the material are subject to microbiological degradation unless countermeasures are taken become.
• alkoxylation of C10 - C22 - Carboxylic acid derivatives and / or C10 - C22 carboxylic acids with OH groups e.g. B. from soy or Products made from linseed oil are added to control the settling of resins.
• WO 94/29510 and WO96 / 18770 describe the treatment of lignin-containing materials Multi-component systems made of oxidizing agents and catalysts as well as mediators from the group of hydroxylamines, hydroxamic acids, aliphatic, cycloaliphatic, heterocyclic or aromatic compounds with N-hydroxy, oxime, N-oxi or N, N-dioxi functions and comediators, the aromatic alcohols, carbonyl compounds, aliphatic ethers, phenol ethers and / or olefins are included, described.
• This object is achieved by the use of one or more Dicarboxylic acid dialkyl esters and / or one or more fatty acid polyol mono, di, tri and / or higher polyester and / or polyester-polyether copolymers in the impregnating pretreatment of the shredded wood raw materials prior to their mechanical defibration.
• the invention accordingly relates to a process for producing fibrous materials, preferably from mechanical wood materials, such as Thermo-Mechanical Pulp (TMP) or Chemi-Thermo-Mechanical Pulp (CTMP) and wood pulp, characterized in that before mechanical shredding of the wood raw materials at least one Dicarboxylic acid dialkyl esters and / or one or more fatty acid polyol mono, di, tri and / or higher polyester and / or polyester-polyether copolymers can be added.
• TMP Thermo-Mechanical Pulp
• CTMP Chemi-Thermo-Mechanical Pulp
• dicarboxylic acid dialkyl esters and / or fatty acid polyol mono, di, tri and / or higher polyesters and / or polyester-polyether copolymers surprisingly are effective in the pretreatment of shredded wood and / or plant materials and that the primary fibers produced with it to a greater extent from the adhering lignin, from Resin parts and other wood contents can be cleaned, so that in highest yield Fabrics with improved optical properties can be obtained.
• the invention especially the brightness, whiteness, tint and color saturation of the mechanical Wood pulps improved without the other properties, in particular the Strength properties of the fibers are impaired.
• the preferred dicarboxylic acid dialkyl esters are the dicarboxylic acid dialkyl and / or diisoalkyl esters of C2 - C12 dicarboxylic acids with C1 - C13 n- and / or iso-alkanols, such as Di-n-butyl oxalate, di-n-butyl malonate, di-n-butyl succinate, di-n-butyl glutarate, di-n-butyl adipate, Di-n-butyl suberate, di-n-butyl sebacate, dimethyl adipate, diethyl adipate, di-n-propyl adipate, Diisopropyl adipate, diisobutyl adipate, di-tert-butyl adipate, di-isoamyl adipate, di-n-hexyl adipate, Di- (2-ethylbutyl)
• esters of saturated and / or unsaturated C8 to C18 fatty acids with polyhydric alkanols with 2 to 6 carbon atoms such as glycol, Trimethylolpropane, glycerol, sorbitol and sorbitan esters of said fatty acids, e.g. B. Glycerol mono- and / or glycerol di- and / or glycerol trifatty acid esters, sorbitol mono- and - difatty acid esters and sorbitan mono- and / or sorbitan difatty acid esters and / or Sorbitan trifatty acid ester used.
• the esters of adipic acid or esters of sorbitan are preferred uses and particularly preferably the adipic acid esters of C1 to C6 n- and / or iso-alkanols, such as dimethyl adipate, diethyl adipate, di-n-isopropyl adipate and diisopropyl adipate, Di-n-butyl adipate and / or diisobutyl adipate, as well as the mixed esters of the above Dicarboxylic acids and alkanols, glycerol trioleate and sorbitan monooleate.
• the adipic acid esters of C1 to C6 n- and / or iso-alkanols such as dimethyl adipate, diethyl adipate, di-n-isopropyl adipate and diisopropyl adipate, Di-n-butyl adipate and / or di
• esters mentioned are used alone or as a mixture in an amount of 0.001-5.00 % By weight, preferably 0.01-2.0% by weight and particularly preferably 0.01-1.0% by weight on the amount of wood and / or amount of plants directly as a substance or in dissolved or in dispersed liquid form used.
• the esters are diluted or directly or concentrated water-based or water-free solution or in the form of water-containing Dispersions used.
• Suitable solvents are n- and iso-alkanols, liquid ones Hydrocarbons and acetone.
• esters can be used alone or in combination with such water-soluble or water-insoluble solvents to disperse emulsions for Use, non-ionic, ionic and amphoteric, especially non-ionic and anionic surfactants can be used as emulsifiers.
• Suitable nonionic emulsifiers are, for example, oxalkyl ethers, preferably Oxethylates and / or terminally blocked oxethylates of fatty alcohols and fatty acids or Oil.
• Anionic emulsifiers are alkyl and / or aryl sulfonates, ⁇ -olefin sulfonates, ⁇ -sulfofatty acid esters, Sulfosuccinic acid esters and alkyl sulfates and ether sulfates as well carboxymethylated oxethylates and soaps.
• the preparation of the invention using, preferably stable, emulsions is known.
• the hydrophobic phase which contains the ester component, in the aqueous emulsifier-containing Phase entered and dispersed with stirring or pumping.
• the dicarboxylic acid dialkyl esters according to the invention and / or listed above Fatty acid polyol mono- and / or - polyester and / or polyester-polyether copolymers can together with other components, namely liquid derivatives of vegetable or animal oils or fats, such as rapeseed oil methyl ester, rape oil methyl ester, Palm oil methyl ester, soybean oil methyl ester and tallow fat methyl ester and synthetic ester oils be used.
• the esters mentioned are preferably added in the form of a aqueous, concentrated or diluted dispersion, possibly with the addition of nonionic, anionic or cationic surfactants, alone or in combination with water-soluble or water-insoluble solvents, prepared in a known manner become.
• the agents to be used according to the invention can also be used for the digestion of raw materials based on other suitable plant materials, e.g. B. of cereal straw or at Digestion of long fiber raw materials from reeds, reeds, parts of oil palms and / or other C4 plants, especially before mechanical defibration in the refiner from which, for example, wood-based fibreboards are produced.
• suitable plant materials e.g. B. of cereal straw or at Digestion of long fiber raw materials from reeds, reeds, parts of oil palms and / or other C4 plants, especially before mechanical defibration in the refiner from which, for example, wood-based fibreboards are produced.
• the method according to the invention is for the production of fibrous materials, in particular for Manufacture of TMP, CTMP and wood pulp and also for the manufacture of Refiner mechanical pulp and chemical pretreatment manufactured refiner pulp (Chemical-Refiner-Mechanical Pulp) suitable.
• Preferred starting materials in the process according to the invention shredded wood, especially wood chips from softwood or hardwood in fresh or stored condition. Likewise are wood chips from sawmill waste or other wood waste or broken wood.
• the raw materials mentioned can be after the method according to the invention also together with other fibrous materials, e.g. Waste paper materials are processed.
• the mechanical wood pulps are produced with a high yield using known ones Process conditions, the wood chips after pre-steaming and more uniform Moisturization can be fed to the impregnator.
• the wood chips are impregnated evenly and after 1 - 60 min, preferably 15 - 30 min lasting or brief, 1 - 10 min, preferably 1 - 5 min lasting Preheating to 110 - 180 ° C, preferably 140 - 170 ° C fed to the first refiner stage, in turn under pressure between the grinding disks under given Separation to single fibers and defibrillation / fibrillation he follows.
• the refiner material is then a refiner refill in a second refiner stage.
• a steam-heated pulper can usually additionally with a treatment Chemicals, e.g. B. made a latency elimination and the bleaching of the wood pulp become.
• the agents to be used according to the invention must be added before the actual mechanical, pulping of the wood pulp or of the plant materials take place, for example, in the manufacture of wood pulp separately or together with the water introduced into the grinding zone.
• a wood material with increased brightness and whiteness receives the dicarboxylic acid dialkyl esters and / or one or several fatty acid polyol mono, di, tri and / or higher polyesters and / or polyester polyether, preferably polyethylene terephthalate and / or polyoxyethylene terephthalate copolymers after the 1st refiner stage.
• the mechanical wood pulp can also be bleached, the increase in brightness and whiteness with the same opacity as well as the Strengths of the fibers, in particular the values of the tear length, the tear work and breaking load remain intact or intact.
• the lignin content of the fabric is at use according to the invention of said esters reduced by about 1% by weight.
• vegetable oil derivatives such as For example, rapeseed oil methyl ester, an increased value of the wood extract is found.
• the inventive method can also be carried out in such a way that under Retaining the previously achievable brightness values and degrees of whiteness to the additional one Bleaching is dispensed with or in such a way that the bleaching saves significantly Amount of chemicals is made. In this way, in particular subsequent yellowing of the fiber materials can be avoided by adding alkalis.
• the dicarboxylic acid dialkyl esters and / or to be used according to the invention one or more fatty acid polyol mono, di, tri and / or higher polyesters and / or Polyethylene phthalate and / or polyoxyethylene terephthalate copolymers as agents for chemical treatment of wood chips are used, according to which known processes pulp or wood-based panels or their preliminary products become.
• TMP was produced in a plant for the production of high-yield fiber materials with the following characteristics: Throughput rates 40 - 65 kg otro / h Volume of the preheater 110 dm 3 (11 m 3 ) Imstorygnatorvolumen 15 dm 3 (1.5 m 3 )
• Di-n-butyl adipate, glycerol trioleate and glycerol trioleate in combination with rapeseed oil methyl ester in a ratio of 1: 1 were used as the impregnating agent ethoxylated fatty alcohol or a highly ethoxyethylated vegetable oil. The amount used was 2.8 g / kg wood chips each.
• the preheater they were briefly subjected to further treatment at temperatures between 110 and 160 ° C for about 20 minutes and then fed to the 1st CD 300 refiner stage via 2 screw conveyors. The resulting refiner material was blown to a cyclone after leaving the grinding zone, where the separation of steam and fiber material took place.
• a partial amount of the TMP produced was at a consistency of 10% by weight, a bleach (bag bleach) using 1.8% water glass, 0.5% complexing agent, 1.8% NaOH and 3.8% H 2 O 2 (the percentages by weight relate in each case to the amount of wood pulp used).
• the bleached fabric was washed and acidified to pH 8.0-8.5 with SO 2 .
• the optical properties were assessed by Rapid-Koethen's sheet formation.
• 500 g of TMP (approx. 20% by weight of dry substance) in 10 l Tap water opened in the pulper.
• the weight of fabric per sheet was 375 g.
• Table 1 contains the manufacturing data and the data of the TMP generated, the abbreviations meaning: Wspec spec. energy support meal freeness EWZ drainage time TP2 the indication of the medium fiber liquor (starting from 3 mm corresponding to 100%) R splitter content
• Table 2 contains the optical property data of the unbleached and bleached TMP.
• Brightness% white hue saturation Opacity% unbleached Comparison 1 61.2 46.6 2.13 1.58 92.0 example 1 64.2 48.6 2.10 1.61 90.7
• the data of the examples show that when using the agents according to the invention the Brightness and whiteness increase by 3-4 points.
• the increase over that Comparison pattern, as well as the opacity, is retained if a bleaching of the TMP is performed.
• TMP Tri-n-butyl quantity 5.6 kg / t 5
• Di-n-butyl adipate and rapeseed oil methyl ester (1: 1)
• 5.6 kg / t 6 glycerol trioleate 5.6 kg / t 7
• sorbitan 5.6 kg / t 8th
• Polyester / polyether copolymer (dirt dissolver-PES-ET 1/30 Hüls AG)
• 5.6 kg / t 9 glycerol trioleate 2.8 kg / t 10 glycerol trioleate 1.4 kg / t

Landscapes

• Paper (AREA)
• Multicomponent Fibers (AREA)
• Inorganic Fibers (AREA)
• Artificial Filaments (AREA)
• Dry Formation Of Fiberboard And The Like (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 1997
  • 1997-02-04 DE DE19704054A patent/DE19704054C2/de not_active Expired - Fee Related
• 1998
  • 1998-01-21 CN CN98803999A patent/CN1252111A/zh active Pending
  • 1998-01-21 CA CA002279524A patent/CA2279524A1/en not_active Abandoned
  • 1998-01-21 JP JP53250298A patent/JP2001509845A/ja active Pending
  • 1998-01-21 EP EP98904108A patent/EP0961851B1/de not_active Expired - Lifetime
  • 1998-01-21 WO PCT/EP1998/000304 patent/WO1998033970A1/de active IP Right Grant
  • 1998-01-21 DE DE59806864T patent/DE59806864D1/de not_active Expired - Fee Related
  • 1998-01-21 AT AT98904108T patent/ATE230814T1/de not_active IP Right Cessation
• 1999
  • 1999-07-20 NO NO993554A patent/NO993554L/no not_active Application Discontinuation
  • 1999-08-30 US US09/355,333 patent/US6344108B1/en not_active Expired - Fee Related

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