DE824237C - Process for the production of condensation products with a tanning effect - Google Patents

Description

Process for the production of condensation products with a tanning effect It has been found that tannins with good filling properties and very good analyzability can be obtained and good tanning ability can be achieved if one uses a- or ß-: Z'al) htholsulfonsäure at higher temperatures first rosin and then I) io # cydiphenyl sulfone or one of its derivatives can act and the reaction mass with formaldehyde post-treated at higher temperatures.

The Men-s of the applicable materials can vary significantly I, the lowest ratios can be determined in each individual case without any particular difficulty by tests.

The reaction is expediently carried out at elevated temperatures, with generally those between 8o and 140 ° are most suitable. The aftercare with formaldehyde is in most cases best carried out at temperatures above go °. The batch is expediently diluted with water. For a certain amount of rosin can easily be determined in each case how much water and formaldehyde for the the most favorable working method and to achieve the best tanning agent is required.

Without removing excess amounts of electrolyte, tannins with proportions of up to 95 are obtained.

The tannins are neutralized before use and with organic Acids adjusted to a suitable degree of acidity.

At high pH values, they show a good filling effect and a rapid one Through-tanning.

Instead of dioxydiphenyl sulfone, its derivatives or Mixtures of Dioxydiphenylsulfonen with phenols or crude phenol mixtures used will.

Instead of the subsequent implementation of the naphtholsulfonic acids with The rosin can also be present during the sulfonation. Examples i. With 700 parts by weight of 100% sulfuric acid, 72o parts by weight are carried at 90 ° ß-Naplithol and 80 parts by weight of rosin and heats the mass for 2 hours 120 °. After cooling to 9b "one carries 300 parts by weight of dioxydiphenylsulfone, containing 500 parts by weight of water. After two hours of stirring at ioo ° the batch is cooled to 95 ° and 68o parts by weight are added with thorough stirring 300% formaldehyde slowly increases.

The tanning agent is clearly soluble in water. It becomes neutral with ammonia and brought to a degree of acidity with acetic acid that io g to complete Neutralization requires 12 cc n-sodium hydroxide solution. With it you get a well-filled, brown leather.

2. 'One works as in example i, but used for post-treatment only 52o parts by weight of 300% formaldehyde.

This tanning agent is also clearly soluble in water. After neutralization and low acidification, a well-filling and stable tannin is obtained. 3. In 700 parts by weight of too "ioie sulfuric acid one adds at 100 ° 720 ('#ewiclitsteile j3-Naplitliol, heats for 3 hours at io', adds 23o parts by weight of rosin at this temperature, adds after Abkiililen to 100.4oo ( _ @ ewichtsteile phenol oil and .4oo parts by weight @ioxvdiphenvlsulfon and eoo (ietvichtsteile water, maintaining the temperature i hour hei ioo - Lind l: hei this temperature il'it run slowly under good küliren 760 parts by weight 3oo / o formaldehyde.

After cooling to 75 ", the tannin is treated with aqueous ammonia and Formic acid adjusted for tanning.

Claims (1)

PATENT A`SYRUCH: A process for the preparation of tanning condensation products, characterized in that nian naplithols are sulfonated, at the same time or after empty rosin is allowed to act at an elevated temperature, the reaction mixture is reacted with a dioxydiphenyl sulfone or a mixture of 1) ioxydiplienyl sulfones, optionally in the presence. of phenols or phenol compounds, and the whole thing is post-treated with Formaldeli_vd at an elevated temperature.