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
  • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
  • D21H27/18—Paper- or board-based structures for surface covering
  • D21H27/20—Flexible structures being applied by the user, e.g. wallpaper
• • 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
  • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
  • D21H17/24—Polysaccharides
  • D21H17/28—Starch
• • 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

Definitions

• a cationic resin in paper sizes as a reaction product of epichlorohydrin with a polymer from the group of an aminopolyamide, which consists of a dicarboxylic acid and a polyalkylene polyamine with two primary amine groups and at least one secondary or tertiary amino group .
• a curable aqueous solution of a thermosetting resin has become known from US Pat. No. 4,336,835, which has a relatively high solids content and allows improved wet strength of paper to be achieved.
• the solution is prepared by reacting an aliphatic dicarboxylic acid with a polyalkylene polyamine to form a polyamide polyamine, which is then reacted with epichlorohydrin.
• the first reaction is carried out at a molar ratio between aliphatic dicarboxylic acid and polyalkylene polyamine of 1: 1.0 to 1.2 until a viscosity of the 50% strength aqueous solution at 25 ° C.
• Adipic acid recommended and as polyalkylene-polyamine triethylene tetramine.
• polyamide-polyamine-epichlorohydrin precondensate the degree of condensation of which is 500 and corresponds to an active content of 12%
• lignosulfonic acid optionally as the calcium salt of sulfonic acid
• Additive to the impregnation liquid for the surface treatment of paper, in particular corrugated raw paper is used.
• the measure according to the invention mentioned above as an additive to the impregnation liquid, it was possible to achieve adequate swelling resistance and an increase in the strength values of the paper, in particular the CMT value (DIN 53143).
• the chlorine component of the pre-condensate does not pose any difficulties with regard to environmental pollution, because chlorine reacts with the calcium contained in the sulfite waste liquor to form CaCl2 and no free chlorine or hydrochloric acid is formed.
• the impregnating agent containing sulfite waste liquor is characterized in that it contains 75-95% by weight sulfite waste liquor, preferably with a solids content of approx. 50%, in a mixture with 0-20% by weight starch and at least 5% by weight.
• a polyamide-polyamine-epichlorohydrin (PPE) precondensate based on sulfite waste liquor, ge optionally with amino-sulfo-carboxymethyl cellulose in an amount of 0.1%, based on the total batch (sulfite waste liquor and PPE resin), as a condensation catalyst.
• the polyamide-polyamine-epichlorohydrin precondensate is made up of the basic materials adipic acid, triethylenetetramine and epichlorohydrin in such a way that an average molecular weight of 20,000 with a chlorine content of 16-18%, preferably 17%, of a condensation temperature of 180 ° C and a reaction time of 45 min results.
• the paper machine speed can be increased. This is possible above all because with a higher solids content, a smaller amount of water has to be evaporated in the dryer section.
• material qualities can be achieved for the corrugated cardboard corrugation, the strength level of which exceeds that of fluting (i.e. a corrugation, the main part of which is primary fibers, as a result of which sufficient rigidity is achieved even without chemical additives) if higher-quality waste paper raw materials are used.
• An impregnation liquid is preferably used which consists of 75% sulfite waste liquor (with a solids content of approx. 50%), 20% starch and 5% polyamide-polyamine-epichlorohydrin precondensate, based on the sulfite waste liquor, 12% act.
• AminoSulfo-Carboxymethylcellulose can be used as a condensation catalyst in an amount of 0.1%, based on the total batch (sulfite waste liquor and PPE resin).
• Such an impregnation liquid is in a ver are preferably used, in which, according to the invention, the impregnating agent is diluted to a solids content of about 27% by weight, preferably with water, and is then used in a manner known per se in the size press before the after-dryer section of the paper machine.
• composition of the sulfite waste liquor can be defined as follows: 65% calcium lignin sulfonate, S content 5%, molecular weight approx. 80,000, 35% carbohydrates with the following spectrum: 43% manose, 30% glucose, 22% xylose, 5% galactose.
• the carbohydrates are in short-chain polymer form in the sense of oligosaccharides.
• the size press liquor can be increased from 8.5%, as is possible with starch, or from 14.5%, as is possible with a mixture of starch and lignin sulfonate to the extent of 1: 1. increase.
• the impregnating agent according to the invention it is possible to achieve qualities in paper webs with a low basis weight, which in conventional methods and conventional impregnating agents can only be achieved with higher basis weights.
• the speed of the paper machine can be increased by approx. 5% compared to normal speeds.
• the CMT strength values can be increased by up to 108% compared to the untreated paper, and the burst pressure by 66.6%, also compared to the untreated paper. This makes it possible to use poorer raw materials, ie practically 100% mixed waste paper (B12), as fiber input for the production of corrugated paper. This means that significant savings can be made in the production of the corrugated paper.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Paper (AREA)

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Publications (3)

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• 1988
  • 1988-07-12 AT AT180388A patent/AT392809B/de not_active IP Right Cessation
• 1989
  • 1989-07-12 EP EP19890890186 patent/EP0351397B1/fr not_active Expired - Lifetime
  • 1989-07-12 DE DE89890186T patent/DE58906478D1/de not_active Expired - Fee Related

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