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
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
  • D21H17/62—Rosin; Derivatives thereof

Definitions

• the invention relates to an invert glue for the mass and surface sizing of paper, consisting of an aqueous dispersion of at least one with an acidic residue containing compound modified rosin or a mixture of at least one rosin modified in this way with at least one unmodified hydrogenated or disproportionated rosin and / or extender and / or additive, the content of the acidic compound, based on the modified resin or resin mixture, 1 to 30% by weight .-% and the acid groups of the resin are 30 to 75 wt .-% saponified, characterized in that it is obtained by partial saponification of the modified resin or resin mixture in the melt with an undiluted or dissolved alkaline saponifying agent with stirring a simple stirrer at normal pressure, if necessary subsequent dilution with water or aqueous saponifier to a solids content of about 50 to 65%, cooling and further dilution with cold water to the desired solids content.
• the Bewoid process was used to produce a glue with a high proportion of free rosin which contained about 90% free rosin dispersed in a small amount of rosin soap and stabilized by the presence of about 2% casein or another protein.
• the casein was used as a protective colloid to prevent the growth of the rosin particles, which kept them in a fine state of disintegration.
• the rosin was broken up mechanically in the presence of about 1 to 2% sodium hydroxide and about 2% casein. The rosin was heated and subjected to mechanical shear stresses until it was divided into small particles.
• glue with free rosin was made according to U.S. Patent 2,393,179, using a non-alkaline dispersant, e.g. a sulfonated higher fatty alcohol was used.
• a non-alkaline dispersant e.g. a sulfonated higher fatty alcohol was used.
• the rosin was melted and the desired amount of dispersant was added with sufficient stirring to form a homogeneous melted mass.
• a practically neutral or weakly acidic aqueous solution or dispersion of a protective colloid, e.g. Casein added forming a paste-like dispersion with a high solids content, which was then diluted with water to a solids content of 40 to 60% by weight.
• glues with free rosin resin represent dispersions of unsaponified resin acids with a certain percentage of resin soap.
• the dispersions were produced by the inversion process. They were mostly used with a free rosin content of 60 to 95% and also contained auxiliary emulsifiers and stabilizers such as stearates, triethanolamine, casein and waxes.
• the reinforced rosins have so far not been suitable for the production of dispersions, since they mostly had too high melting points, tended to crystallize or formed fine crusts when dispersed, which led to signs of sedimentation. It describes a paper glue and a process for its production in the form of an aqueous dispersion with a high content of free rosin, in which reinforced rosin is mixed at elevated temperatures with fatty acids, fatty acid mixtures and / or naphthenic acids and the dispersion was carried out in a known manner. The method was used as an inversion method.
• the Swedish patent application 74 10 018-1 describes a practically stable aqueous dispersion consisting essentially of water, rosin material and an alkali metal alkylbenzenesulfonate as a stabilizer for the rosin material.
• the dispersions were made by passing a prepared mixture of the components through a homogenizer.
• US Pat. No. 3,906,142 describes a means for sizing paper without using aluminum sulfate, which contained a stable aqueous dispersion of a rosin reinforced by reaction with an ⁇ , ⁇ -unsaturated carboxylic acid or a corresponding anhydride, a protective colloid, for example casein, and a volatile base, for example ammonia, with at least 90% of the reinforced rosin being unsaponified.
• the inversion process was used to produce this agent, in which first reinforced rosin was melted in a container equipped with a stirring and heating device.
• a dispersant and stabilizer was then prepared in another container by dissolving a measured amount of a protective colloid, such as casein, and a measured amount of a volatile base, such as ammonia, in water.
• the prepared dispersing and stabilizing agent was then quickly added to the molten rosin using high-speed stirring or other intensive mixing during and after the addition. Finally, the solids content of the resulting aqueous rosin dispersion was adjusted by adding a calculated amount of water.
• an invert glue for the mass gluing of paper which contains an aqueous dispersion of a reinforced rosin with a content of certain dispersants of the sulfonate type.
• protective colloids such as casein should not be necessary in the production of this known paper glue, but it was necessary to work with the specific dispersants and with hot inversion water.
• the glue thus obtained consisted of a practically homogeneous, stable aqueous suspension of a reinforced rosin or a mixture of rosin and reinforced rosin and a very small amount of saponified rosin or rosin mixture in a state of fine separation in water.
• the saponified resin acted as a dispersant for the resin particles.
• This glue was used to glue paper.
• U.S. Patent 3,565,755 which worked without a protective colloid, was very cumbersome and due to the use of the water-immiscible organic solvent, e.g. Benzene, which is physiologically extremely questionable, also dangerous, apart from the fact that a homogenizer had to be used.
• DE-OS 24 26 038 describes a process for the production of a practically stable aqueous dispersion of a rosin-based material suitable for use in the gluing of cellulose-like fibers, in which an unstable, aqueous dispersion containing at least 5% solids from 0 to 95% rosin and 100 to 5% of a reaction product of rosin with an acid, the rest containing compound, wherein the amount of acid compound bound as an adduct was about 1 to 20% of the total solid weight, was homogenized under a pressure of about 142 to 563 bar and at a temperature of about 150 to 195 ° C in the presence of an anionic dispersant.
• the invention has for its object to provide a new invert glue for mass sizing and surface sizing for paper pretreated with aluminum sulfate, which has all the advantages of previous paper glues and in the production of the use of protective colloids, be it casein or its synthetic substitute products, of special dispersants or of Solvents, such as benzene, but also the use of complex agitators and homogenizers, as are usually used in dispersion production, and high pressures for homogenization can be dispensed with.
• the invert glue is obtained by partially saponifying the modified resin or resin mixture in the melt with an undiluted or dissolved in water alkaline saponifying agent with stirring with a simple stirrer at normal pressure, optionally subsequent dilution with water or aqueous saponifying agent to a solids content of about 50 to 65%, cooling and further dilution with cold water to the desired solids content.
• the invert glue according to the invention contains 5 to 60% by weight of resin in the dispersion, the acid groups of which are neutralized to about 30 to 75%, preferably 32 to 67%.
• the rest 100% consists of water.
• the invert glue according to the invention can be produced in an open reactor at atmospheric pressure.
• comparatively slow agitators are used, such as those used in resin soap production.
• Continuous production is also possible: In the continuous mode of operation, for example, the modifi Ornamental resin or the resin mixture in the molten state and the saponifier in aqueous solution are pumped together into a cascade of stirred tanks. At a point where the mixture is at a temperature. from 30 to 35 ° C, then cold water can be added. The cooling can be done by natural convection or with cold water. A. Another possibility is to carry out the dilution in a separate tank, which means that the reactor unit is shortened.
• the rosin used in the invention can be any of the commercially available types of rosin, e.g. Root resin, balsam resin, tall oil resin and mixtures of two or more of these resins in the raw or refined state. Resins with a tendency to crystallize can be treated at elevated temperatures with formaldehyde or paraformaldehyde in the presence of an acid catalyst, e.g. p-toluenesulfonic acid, are treated in a known manner. Thus, resin treated with formaldehyde can be used and falls under the term "rosin resin" used here.
• an acid catalyst e.g. p-toluenesulfonic acid
• a modified or reinforced rosin is a reaction product of rosin with an acidic compound that does the rest contains, which is obtained by reacting rosin with the acid compound at elevated temperatures, usually about 150 to 210 ° C, as an adduct.
• the amount of the acidic compound used is adjusted so that a modified rosin with a content of 1 to 30% by weight, preferably 5 to 12% by weight, of the added acidic compound, based on the weight of the reinforced rosin, is obtained.
• Methods for making reinforced rosins are described in U.S. Patents 2,628,918 and 2,684,300.
• Examples of acidic, the rest Compounds containing that can be used to make the reinforced rosin are the ⁇ , ⁇ -unsaturated organic acids and their accessible anhydrides; specific examples include acrylic acid, maleic anhydride, fumaric acid, maleic acid, itaconic acid, itaconic anhydride, citraconic acid and citraconic anhydride.
• the preferred modifying acid is acrylic acid. If necessary, acid mixtures can be used to produce the modified rosin.
• Mixtures of various reinforced rosins can also be used.
• a mixture of the acrylic acid adduct on rosin and the fumaric acid adduct on rosin can be used to produce the invert glues according to the invention.
• the rosin can optionally be mixed with known additives, for example waxes, in particular paraffin wax and microcrystalline wax, hydrocarbon resins including those derived from petroleum hydrocarbons and terpenes, spindle oils or polyglycols.
• waxes in particular paraffin wax and microcrystalline wax
• hydrocarbon resins including those derived from petroleum hydrocarbons and terpenes, spindle oils or polyglycols.
• a portion of the rosin can also be mixed through an extender to be replaced.
• an extender which can be used in amounts of about 30 to 50% by weight, based on the weight of the rosin, are, for example, tall oil derivatives.
• Mixtures of modified and unmodified, hydrogenated or disproportionated rosin contain about 50 to 100% modified resin and about 50 to 0% unmodified, hydrogenated or disproportionated resin.
• Mixtures of modified resin, resin and resin extender contain about 25 to 49% modified resin, about 5 to 50% unmodified resin and 0 to 25% extender for the modified resin.
• this mixture can contain any of the rosins listed above, modified and unmodified, optionally also partially or practically completely hydrogenated or disproportionated or polymerized.
• the resulting durable paste with a solids content of about 63% was diluted with 108.5 parts of cold water before being used for paper sizing to give a low viscosity dispersion with a solids content of about 32% which was stable for about 8 hours.
• the resulting durable paste with a solids content of about 54% was diluted with 108.5 parts of cold water before use for paper sizing to give a low viscosity dispersion with a solids content of about 27% which was stable for about 8 hours
• the resulting durable paste with a solids content of about 54% was diluted with 108 parts of cold water before being used for paper sizing.
• a low-viscosity dispersion with a solids content of about 27% was obtained, which was stable for about 8 hours.
• This example illustrates the continuous production of an invert glue according to the invention.
• the mixture Before being used for paper sizing, the mixture was cold-diluted with 108 parts of water.

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• Adhesives Or Adhesive Processes (AREA)
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Publications (1)

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Cited By (29)

Citations (3)

• 1979
  • 1979-04-23 DE DE19792916379 patent/DE2916379A1/de not_active Withdrawn
• 1980
  • 1980-04-21 EP EP80102125A patent/EP0018007A1/fr not_active Withdrawn

Patent Citations (3)

Non-Patent Citations (1)

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