CS252720B1 - Tannery auxiliary preparation - Google Patents

Abstract

The problem of the composition of the tanner's auxiliary product suitable for application in tanning operations to improve the efficiency of technological processes is solved. The essence of the preparation according to the invention is that it contains 20 to 50 wt. chemically unmodified neutral oil, 7 to 25 wt. a synergistic mixture of oxyethylated higher fatty alcohols or oxyethylated higher fatty amines, 2 to 8 wt. an anionic leveling agent, 8 to 12% by weight; % formalin, 4-12% wt. urea, up to 61% by weight. water.

Description

The invention relates to a tannerial auxiliary composition based on emulsified oil, formalin and urea.

Various tanneries are currently used in tanneries to improve the quality and speed of the leather production process, but also to protect the environment. At present, a wide range of formulations is known, in particular in the pre-posting, pre- or post-tanning phases. Preparations are known which are prepared on the basis of the condensation product of naphthalenesulfonic acid and formaldehyde. Another formulation is an emulsion comprising a neutral spindle oil and a non-ionic emulsifier. Also known are formulations comprising the reaction products of formaldehyde, urea and a sulfonated phenolic compound, or a composition consisting of C 8 -C 30 alkyloamides of fatty acids and surfactants. Further, a preparation is known comprising formaldehyde and aromatic hydroxy compound condensation products, or their sulfomethylated condensation products, aromatic or hydroxyaromatic sulfoacids or their formaldehyde condensation product or their formaldehyde and urea condensation products, wherein the sulfoacids are at least partially in the form of alkali metal salts and / or ammonium salts. Also known is a non-ionic filler with a filling effect comprising chloroparaffin, chlorinated crystalline mixtures of C20-35 long chain alkanes, with a chlorine content of 40 to 43%, polypropylene oil, urea-formaldehyde resin, copolymer-based nonionic oxide surfactant and ethylene oxide, a non-ionic emulsifier based on oxyethylated higher fatty alcohols with 24 to 25.5% water. Further, preparations are known, the first of which is prepared by reacting a mixture of sulfonated naphthalene and sulfonated phenol with urea and formaldehyde. The second preparation comprises fatty acid esters of 10-25 carbon atoms, mineral oils, oil-soluble sodium or potassium sulfonates, and a non-ionic surfactant. The third preparation is formed by emulsifying an aqueous solution of an alkyl sulfonate having an alkyl residue of at least 8 carbon atoms. A disadvantage of these preparations is the reduced ability to penetrate the skin layers. In the treatment of hides, their distribution into the skin layer is uneven. The surface tension at the phase boundary is relatively high, thereby reducing the efficiency of subsequent leather manufacturing operations.

These drawbacks are eliminated by the tanner's auxiliary composition, which consists of 20 to 50 wt. % of chemically unmodified neutral oil, 7 to 25 wt. % of a synergistic mixture of oxyethylated higher fatty alcohols or oxyethylated higher fatty amines, 2 to 8 wt. % of anionic leveling agent, 8 to 12 wt. % formalin, 4 to 12 wt. urea and falls up to 61% water.

The technical effect of the tanner's aid is that it reduces the surface tension at the phase interface, thereby increasing the ability of chromium to penetrate into the skin layers in the subsequent chromination. It reduces friction between the skins and between the skins and the barrel wall and emulsifies the tanning agent. The preparation increases the efficiency of other chemicals used in leather manufacturing operations. The preparation is undemanding and all the ingredients used are available.

The tanner adjuvant is further illustrated by the following examples, wherein the amounts of the ingredients are given in percent by weight.

Example 1

The tanner's adjuvant was prepared by homogenizing the following ingredients:

Polypropylene oil 20% synergistic mixture of higher fatty alcohols with degree of oxyethylation 3 to 30 moles of ethyl

oxide 10 % sodium benzenesulfonate 2 % formalin 10 % urea 8 % Water 50 %

Example 2

The tanner's adjuvant was prepared by homogenizing the following ingredients:

polypropylene oil 40% oxyethylated dodecylamine 7% sodium benzenesulfonate 5% formalin 8% urea 8% water 32%

Example 3

The tanner's adjuvant was prepared by homogenizing the following ingredients:

hoof oil 30% oxyethylated triethanolamine with an oxyethylation degree of 2 to 10 moles of ethylene oxide 18% sodium dodecylnaphthalenesulfonate 7% formalin 12% urea 6% water 27%

Example 4

The tanner's adjuvant was prepared by homogenizing the following ingredients:

sunflower oil 50% synergistic mixture of higher fatty alcohols with degree of oxyethylation 3 to 30 moles ethylene oxide 20% sodium benzenesulfonate 8% formalin 10% urea 12%

In addition, castor oil, rapeseed oil, olive oil or other vegetable and animal oils may be used as chemically unmodified neutral oils. Sodium salt of dinaphthyl methanesulfonic acid and sodium naphthalenesulfonate may be used as an anionic leveling agent.

Claims (1)

An emulsion oil, formalin and urea-based tanning aid, characterized in that it contains 20 to 50% by weight of a tanner. of chemically unmodified neutral oil, 7 to 25 wt. % of a synergistic mixture of oxyethylated higher fatty alcohols or oxyethylated higher fatty amines, 2 to 8 wt. % of anionic leveling agent, 8 to 12 wt. formalin, 4 to 12 wt.% urea, up to 61 wt. water.