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
  • D21H17/03—Non-macromolecular organic compounds
  • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
  • D21H17/14—Carboxylic acids; Derivatives thereof
• • 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
  • D21H17/03—Non-macromolecular organic compounds
  • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
  • D21H17/07—Nitrogen-containing compounds

Definitions

• the invention relates to the production of papers, in particular wet or dry creped papers with increased suction speed compared to aqueous media.
• Increased water absorption speed is particularly required for the papers that are used in the field of hygiene, such. B. toilet paper, paper towels, kitchen rolls, etc.
• Fibers with a low degree of grinding and large fiber diameters generally lead to more voluminous and thus more absorbent papers.
• pulps come from softwoods such. B. pine or Douglas fir, followed by spruce.
• Hardwoods generally result in low absorbency with the exception of beech.
• Tissue types such as handkerchiefs and kitchen rolls, are given a more or less wet-proof finish.
• cationic wet strength agents such as B. polyamide-epichlorohydrin condensation products used.
• the creping of the paper is carried out, for example, in such a way that the paper web is guided to a large-diameter drying cytin and dried there and is detached from the cylinder surface at the end of the path on the cylinder by means of a so-called creping scraper.
• the extent of the creping is determined by the speed difference between the drying cylinder and the subsequent reeling.
• creping aids adheresives
• Increased use of waste paper with a high degree of grinding and a high proportion of filler and fine material as a raw material for tissue generally leads to a deterioration in the drainage in the wire section, to increased adhesion to the drying cylinder and to a strong abrasion of the crepe scrapers.
• the chemicals used to increase the wet strength additionally deteriorate the drainage and absorbency of the papers and increase the adhesive effect on the drying cylinder.
• absorbent cellulose products are used which are produced by dry defibrillation of cellulose pulp or cellulose fiber pulp with the formation of flakes.
• the cellulose pulp should have a low mechanical strength in order to enable the fibers to be separated from one another without destroying them and to reduce the energy required for the breakdown.
• the flakes obtained after dry-cutting should have a good liquid absorption capacity and a short absorption time.
• cationic surfactants such as quaternary ammonium compounds to reduce the bonds between the cellulosic fibers. These compounds result in a noticeable impairment of the water absorption time.
• non-ionic substances which are ethoxylated or propoxylated aliphatic alcohols or alkylphenols are used, and SE-B-402607, referenced in Chemical Abstracts Vol. 89, 181,429, teaches a process in which alkoxylated aliphatic Alcohols in combination with quaternary ammonium compounds can be used as retention agents.
• Non-ionic compounds are used in the production of absorbent cellulose pulp, these compounds consisting of partial fatty acid esters of polyhydric alcohols having 2 to 8 carbon atoms or their anhydrides, i.e. Anhydro derivatives such as B. inner ethers or of polyethylene or polypropylene glycols with molecular weights up to 500.
• the object of the present invention was to improve the known processes for the production of absorbent papers, in particular dry or wet creped papers, in such a way that the adhesion to the drying cylinder is reduced and the formation of deposits on the drying cylinder is prevented.
• Carboxylic acid esters and / or polyethers in which the alkyl group of the ethoxylated and / or propoxylated alkylphenol has 8 to 16 carbon atoms, for example an ethoxylated and / or propoxylated nonylphenol, are preferably used.
• Particularly suitable alcohols are ethylhexanol, dodecanol, lauryl alcohol, stearyl alcohol and the so-called Guerbet alcohols.
• Suitable ethoxylated and / or propoxylated amines include, for example, polyoxyethylene cocosamines, polyoxyethylene valley amines, polyoxyethylene oleylamines and polyoxyethylene octadecylamines, which are commercially available with different degrees of ethoxylation under the trade name Ethomeen.
• Ethoxylated amides are commercially available under the trade name Ethomid "and consist, for example, of polyoxyethylene oleoamides or polyoxyethylene valley amides. These are also suitable starting products for the carboxylic acid esters and / or polyethers to be used according to the invention.
• Fatty and resin acids are particularly suitable as carboxylic acids.
• Carboxylic acids containing 12 to 20 carbon atoms for example oleic acid, palmitic acid or abietic acid, are preferred.
• Long-chain epoxides which are suitable for the invention are, in particular, 1,2-epoxides with 8 to 30 C atoms.
• Polyethers in which the long-chain 1,2-epoxide contains 12 to 18 carbon atoms are preferably used.
• the degree of ethoxylation and / or propoxylation of the ethoxylated and / or propoxylated primary or secondary alcohols, alkylphenols, amines and / or amides converted to carboxylic acid esters or polyethers is preferably 5 to 15.
• the carboxylic acid esters are prepared by reacting the ethoxylated and / or propoxylated alcohols, alkylphenols, amines and / or amides with corresponding carboxylic acids at temperatures between approximately 160-225 ° C. and under normal pressure, using 0.1 to 0.5 as the catalyst % By weight p. Toluenesulfonic acid, based on the total batch, be added. After the majority of the water of reaction has been distilled off, the rest of the water of reaction is drawn off under a vacuum of 80 to 100 mbar. The acid number of the finished products is approx. 5-8.
• the polyethers are prepared by reacting the ethoxylated and / or propoxylated alcohols, alkylphenols, amines and / or amides with the corresponding long-chain 1,2-epoxides with 0.1 to 0.5% by weight KOH, based on the total batch , as a catalyst at temperatures between 100-180 ° C.
• the carboxylic acid esters and / or polyethers used according to the invention also have excellent self-emulsification properties which make predilution superfluous. It is therefore a preferred embodiment of the present invention that the carboxylic acid esters and / or polyethers are added in liquid form in an active ingredient concentration of more than 80% by weight.
• polyethers which are solid, it is preferred that the addition is made in an aqueous dispersion or solution for better metering of the polyether.
• the carboxylic acid esters and / or polyethers are added to the paper in an amount of 0.05 to 0.5% by weight, based on dry cellulose.
• the carboxylic acid esters and / or polyethers are added in the Dutch, pulper and / or during sheet formation.
• a carboxylic acid ester C ester of nonylphenol ethoxylate with 9 EO and stearic acid was used to increase the absorbency.
• the results and comparative results are summarized in Table 11.
• the basis weight of the papers was 34 g / m 2 .

Landscapes

• Paper (AREA)
• Secondary Cells (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)
• Air Bags (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6234702

Family Applications (1)

Country Status (7)

Families Citing this family (15)

Family Cites Families (17)

• 1984
  • 1984-04-30 DE DE3416043A patent/DE3416043C2/de not_active Expired
• 1985
  • 1985-03-29 AT AT85103781T patent/ATE27193T1/de not_active IP Right Cessation
  • 1985-03-29 EP EP85103781A patent/EP0161443B1/de not_active Expired
  • 1985-04-15 FI FI851500A patent/FI83443C/fi not_active IP Right Cessation
  • 1985-04-17 CA CA000479364A patent/CA1248711A/en not_active Expired
  • 1985-04-29 US US06/727,737 patent/US4632730A/en not_active Expired - Lifetime
  • 1985-04-30 JP JP60091315A patent/JPH0621440B2/ja not_active Expired - Lifetime

Also Published As

Similar Documents

Legal Events