SU546286A1 - Method of skin treatment - Google Patents

Description

(54) METHOD FOR SKIN TREATMENT

Isobreggination refers to the leather industry. It can be used for tanning leather.

Known treatment Koch by tanning it with plant materials. However, semi-flaccidity

tel m

Leather tanning with chromium salts is known. This method has no flaws, which is higher, however, in the working ones. solutions contain a large amount of ipoma salt (0.6–1.8%), which requires additional

g p 1 G Q 1

cleaning, i.Jj

It is also known gtrimenenke for tanning leather of such aluminum salts as sulfates or aluminum chlorides, having a high ocHOBfiOciia. Processed in this way, the co. ;;. A has low wind and heat resistance | 4j.

A method of treating the skin is proposed which eliminates these disadvantages. This is achieved by the fact that before tanning or after it, the skin is exposed to

new aluminum polychloride of the general formula

..) ,,,

where m 1,1 - 2,1; “0.12 0.18;

ripi- this poly1xride aluminum has a basicity of 37-70%, preferably 65-66%, and the pH of the final solution is 3,, 2, the molar ratio Cr DjAEjOi is O, l-3,5j, preferably 1.1 - 1 , 3, in vegetable tanning, the content in the main aluminum polychloride is equal to the weight of the skin.

Such basic aluminum polychloride is usually toughened by treating a mixture of aluminum chloride and aluminum sulphate with basic alkaline and / or alkaline earth agents.

It has been established that the said aluminum polychloride has an effect on the chrome tanning bath, causing an increase in the basicity and complexation, whereby the residual amount of the chromium salt Cfg 0; is 0, O15-O, 4%.

The skins treated with the use of aluminum polychloride, compared to chrome tanned skins, are characterized by better filling, the margins in such skins are fuller, their structure is more cohesive, and the susceptibility to dyeing is good.

The method is carried out in the following way.

Leather, for example, cattle, oak and chromium salts or vegetable tannins, after which basic aluminum polychloride is applied, the basicity of which is 37-70%, preferably 65-66%, while the pH of the final solution is 3; 9-

4.2, and the molar ratio of Cg3Od. is 0.1-3.5, preferably 1.11. 3. In vegetable tanning, the content is mainly aluminum polychloride

is 1-4% by weight of the skin.

Example 1 The cattle skin, 2 mm thick, after decalting the softening and dressing with a solution of pH 2.8, is tanned in a drum with a solution containing (in% by weight of the skin): water 40, sodium chloride 3. After 10 minutes of drum rotation . They are 2% of salt of Cr Oj, the basicity according to Shorlem is 33%. After 2 hours, basic aluminum polychloride (Sumol) containing 8.5% 0 basicity 66%, content 504 2.6% was introduced into the bath. The administration is carried out gradually over a period of 3 hours, with the amount of AED Oz being 1%. Then, a 2% bicarbonate solution is added in portions to a PX solution of 3.9-4. This processing time is 10-12 hours. The solution thrown into the stock contains CGG Oh OKE

0.2%.

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Example 2 The skin of the ram after de-cleansing, softening and etching with 40 solution with a pH of 2.8 is immersed in a drum with a solution containing 40% water and 2% sodium chloride. The drum was rotated for 10 minutes, after which Sumol was added in three steps to obtain an ABg Oj content in 45 solution of 3%. In order to increase the basicity, 3% sodium bicarbonate is added up to pH 3.9–4.0. The treatment time is 10–12 hours. After Dani, the skin is of the same thickness as dubt in a solution containing 1.5% CfjOj 1OO% and water. The basicity is 33%. Tanning is carried out for 3 hours with the gradual addition of 0.5% sodium bicarbonate, then the drum is rotated for another 3 hours. pH of 3.9-.4 solution. Subsequent processing is carried out according to the technology. Selected — § & tanning solution discharged into the drain contains Cg O, 0.2%.

Froze Chevro after dezizolivanie, softening and etching a solution with a pH of 2 to 8 is treated with a solution containing 40% water and 2% sodium chloride. Sumol was added to the solution in three steps, the content being up to 3%. The treatment is carried out in a drum for 4 hours, after which 2% cationic grease is added to the solution and the drum is rotated for another 2 hours. The basic solution is then increased with sodium bicarbonate. pH at the end of tanning is 3.9-4. The total processing time is 10 hours. After a three-day aging, the skin is flattened in thickness, then neutralized with a solution containing 300% water and 2% calcium formate. After 40 minutes of rotation, sodium bicarbonate is applied, then checked for completeness neutralization. The total rotation time is

3 hours Tanning is carried out with a solution comprising 2OO% water and 15% tannin in a powder (miluse), and dubious ones are given in

4 ingestions in 30 minutes. In the intervals, enter 2%} of grease. The rotation is carried out until complete impregnation, followed by washing. The temperature limit to which the skin is water resistant exceeds 9 ° C.

Claims (4)

Invention Formula 1, A method of treating skin by chrome or vegetable tanning, characterized in that, in order to improve the quality of the skin, before or after tanning it is exposed to basic aluminum polychloride of the general formula AecOHV CEj.p., (50) „, where m - 1.1 - 2.1; I am 0.12 - 0.18. 2, the method of claim 1, wherein that aluminum polychloride has a basicity of 37-70%, preferably 6566%. 3, the Method according to PP. 1 and 2, distinguishing us and. and with the fact that the pH of the final solution is 3, 2. Way 1.2, 3, otlipo nn u and u with what molar ratio. C fg is 0.1-3.5, AfigOj is 1.1 1.3. 5. The method according to paragraphs. 1.2 and 3, characterized in that what's with vegetable Afoo tanned kept woman basically 2U5 Agao / line polychloride is based on skin weight. 5 Sources of information taken into account in the examination: № 1. USSR Copyright Certificate No. 149851, cl. C 14 C 3 / 1O, 1961.№ 546286 № 6 2. USSR author's certificate 24455O, class C 14 C 3/06, 1968 - prototype. 3. USSR author's certificate 323444, cl. C 14 C 3/04, 1969. 4. USSR author's certificate 162621, cl. C 14 C 3 / O2, 1963.