RU1775519C - Method of treatment of worn leather split leather chamois and velour articles before redyeing - Google Patents

Abstract

Usage: dry cleaning and dyeing of articles made of split leather, suede and velor SUMMARY OF THE INVENTION: Products are cleaned in perchlorethylene medium, treated in a sealed container with a solution containing equalizer A 0.5-3.0 wt.%, Isopropyl alcohol 4.5 -27.0 wt.%, Hydroxyethylated synthetic fatty alcohols (Ct2-Ci4) with a degree of hydroxyethylation of 3-oteksil ALM-3 0.2-0.5 wt.%, The rest of perchlorethylene, for 10-25 minutes , and dried 40-50 min 1 table.

Description

The invention relates to the finishing and dyeing of leather goods, in particular to the dry cleaning of articles made of split leather, suede and velor before repainting.

In the process of wearing suede, split leather and velor products, those places that are exposed to sunlight may discolor or change their color due to the oxidation of the dye and excipients. These changes are irreversible and cannot be fixed by dry cleaning or repainting.

To eliminate these defects, an additional treatment of these products is introduced before repainting.

A known method of preparing products from leather fabric for repainting by cleaning them in perchlorethane in a dry cleaning machine and subsequent grinding of leather fabric with an emery cloth manually.

With this preparation method, only surface defects and contaminants are eliminated.

the product is retained and is not removed by repainting.

There is a known method of preparing leather fabric products for aerosol dyeing: the products are cleaned in perchlorethylene medium, then, after pressing and drying, they are treated manually with a solution of surfactants at pH 4, the value of which is controlled by the introduction of acetic acid. Then, the products in plastic bags are placed on a spacer (heat treatment in a rocker dryer for 120 minutes, dried in the same dryer to 30% humidity for 60 minutes.

This method of preparation does not provide uniform coloring of products, in addition, it is time-consuming and lengthy.

The purpose of the invention is to intensify the process and improve the quality of repainting.

This goal is achieved in that the worn products made of split leather, suede and pelura after cleaning with perchlorethylene are treated with a solution containing, wt.%:

Leveling device A0.5-3.0

(L

WITH

vi

vj trunk

YU

Isopropyl alcohol 4.5-27.0

Oxyethylated Synthetic Oily

alcohols (Ci2 - Ci4) with

degree of oxmethyl-

rovani 3-oteksil ALM-3 0.2-0.5

Perchlorethylene

in a sealed container for 10-25 minutes and dried for 40-50 minutes.

Leveling agent A (GOST 9600-78) with a weakly expressed cationic properties, a textile auxiliary substance is usually used for dyeing textile materials in an aqueous medium.

Isopropyl alcohol (propanol-2) is a colorless liquid with a characteristic odor. GOST 9805-76 is used as a solvent. In this composition it acts as a stabilizer for leveling agent A, a wetting agent and helps to level the skin properties over the entire area.

Otexil ALM-3 - ethoxylated synthetic fatty alcohols, degree of hydroxyethylation 3 (TU 6-36-609-8-890) - yellow liquid is used as an auxiliary substance for dyeing textile materials. In this composition, it acts as a leveling agent for the color of the emulsifier, improves the washing away of soils and stains from products.

The compositions are prepared as follows: isopropyl alcohol was added to the calculated amount of equalizer A with stirring, then the required amount of ALM-3 otexil was added. The mixture was stirred and combined with perchlorethylene.

An experimental verification of the claimed method was carried out on samples of fur and leather velor dyed in orange-brown color, manufactured by the Grodno leather factory

Example. Skin samples are pre-cleaned in perchlsrethylene for 5 minutes, squeezed from excess solvent and placed in a sealed container in a laboratory setup. Samples are poured with a composition containing, wt.%: Equalizer A-0.5. isopropyl alcohol 4.5, oteksil ALM-3 0.5, the rest is perchlorethylene. Processing is carried out for 25 minutes, after which the samples are squeezed and dried for 40-50 minutes. The total processing time of 80 minutes Then, part of the samples was repainted with a composition containing a liquid organic black dye conc. 100 ml / l and perchlorethylene.

For samples that have not undergone repainting, it is determined: before pre-treatment, the welding temperature, color intensity, after processing, the color intensity, softness and elasticity, shrinkage, and weld temperature. For samples after repainting, the intensity and evenness of repainting are determined.

The compositions and processing modes for other examples, as well as indicators of the samples obtained, are given in the table.

PRI me R 5 (comparative), Samples are prepared with perchlorethylene, for 5 minutes, then squeezed and dried from excess solvent, polished manually for 50 minutes on a laboratory bench, then the samples are treated with an aqueous solution containing 0, 5 g / l of a surfactant (OP-7, OP-10 or Syntamide-5) with a pH of 4 (pH is adjusted by adding acetic acid). The treatment is carried out using a piece of foam, then the samples are placed in a plastic bag for bedding in an oven. After 120 minutes of curing - heat treatment at 50 ° C, the samples are dried to a moisture content of skin tissue of 30% for 60.0 minutes at 30-35 ° C. The total processing time is 250 minutes

Samples after processing were aerosol repainted with the above repainted composition.

Claims (1)

The claims A method of treating used articles of split, suede and velor before repainting, comprising cleaning the article in perchlorethylene medium, subsequent treatment with a solution containing a surfactant, and drying, characterized in that, in order to intensify the process and improve the quality of repainting, the treatment is carried out in a sealed container with a solution containing, wt.%: Leveling device A0.5-3.0 Isopropyl alcohol 4.5-27.0 Oxyethylated synthetic greasy alcohols () with degree of hydroxyethylation 3-oteksil ALM-3 0.2-0.5 Perchlorethylene Else for 10-25 minutes and dried for 40-50 minutes. Table continuation Note. The intensity of the color of the samples and the color repainting was determined on a color control device and its reproduction - NTK spectrum in units of the CIELAB system. Softness and elasticity were determined visually. Shrinkage of the samples was determined according to GOST 938 13-70. The welding temperature of the samples was determined according to GOST 938.