SU577237A1 - Method of leather tanning-filling - Google Patents

Description

one

The invention relates to light industry, in particular, to the technology of tanning industry and can be used to remove and fill them.

Known methods for tanning leathers include treating with silicic acid in combination with other tanning agents l.

There is also known a method of tanning leather with only silicic acid 2.

However, the existing methods of tanning and poddublivanie skin using cream. Neic acid often reduce the strength of the skin and its facial layer, which causes a fatness.

The purpose of the invention is to reduce the looseness and scent of the skin.

This is achieved due to the fact that the skins are subdued and filled with an aqueous solution of silicic acid, silicon refined and organic liquid, for example sodium polyethylsiliconate (GKZH-1O) or polymethylsiliconate sodium (GKZH-11} for 30-minutes O. Results experimental the works (see table) show that using the method of poddubivanie leather .;

with solutions containing silicate compounds and water-soluble silica compounds, it makes the skin fuller. reduce looseness, reduce the amount of stress, increase spiping, improve

 do not eliminate the need to use other substances for

poured out.

At the same time, such treatment, in contrast to the treatment with individual lysing compounds (silicic acid), does not cause a decrease in the strength of the skin and its facial layer.

sodium hydroxide or electrode (GOST 017-41 n 442O-48), which is pre-anapized to contain 3 "0" and sliverness (according to the methyl indicator and in the ohm);

Silicon organic water-soluble liquids GKZH-1O or GKZH-11, which are analyzed thoroughly for the content of solids and lye. A 10% solution of sulfuric acid is poured into the reactor, the consumption of which, per 10O%, must exceed 1.4–1.5 times the alkali content in the solution and then liquid glass and preparations of GKZh-10 or GKZh-11 . Liquid glass and preparations of NGL-10 or NGL-11 are mixed in a separate container in the ratio: per weight, 0.4 gg of liquid glass is added, 6 wt. including technical {30%) drug NGL-10 or NGL-11. After diluting the solution with water in a ratio of 1: 3 and mixing thoroughly, it is introduced into the solution of sulfuric acid with continuous stirring. The prepared solution is transparent and the pH value is 1.4 - 1.8. It is used to add skin to the skin. Example. Prefabricated chrome tanning from medium or high lightweight crushing, thickness of planing is 1.6-1.7 mm. The percentage of materials is calculated depending on the weight of planed leather. Washing 1-g. -2.5, temperature 30 ° C, 15 minutes, Washing speed 2- W.K. 2.5 temperature -30 C, 1O min. Poddublivanie-filling: zh.k. 0.6 - 0, 30 С while the drum rotates through the hollow axis, a solution of silicic acid, modified with silicon with an organic liquid, in the amount of 1.0-3% is introduced, of which O, 4-O, 6% of the technical product of the preparation GKZH-1O or GKZH -11, Duration of treatment with SO-4O min, then, while the drum rotates, sodium formate or sodium sulfate in an amount of 0.5-0.7% is added in a 10% solution in an amount of 0.5–0.7% and rotation is continued for 15–20 Min. The pH of the bath at the end of the treatment is 3.5-4.0. Further processes: washing, neutralization, dyeing, greasing are performed according to the current method. Subdulling with organic tanning agents. not produced. PRI me R 2. Semi-finished chrome tanning from pork raw materials. Thickness 1, 1 - 1.2 mm. The semifinished product is directed to white skin and lining skin. Material cost is calculated as a percentage of the weight of planed leather. Washing 1-g, 2.5, temperature 30 C, 10 min. Flushing 2- g.k. 255, temperature 30 С, 10 min. Bubbling-filling: g.k. , 0.6–0.8, temperature 30 ° C, aluminum-alum alum 1.5–3, 0% or chrome tanning agent with a basicity of 38–40% in an amount of 0.5–0.6% CG d and in 5 minutes at rotation of the drum through the hollow axis introduced a modified silicon organic solution of silicic acid in the amount of 1, O - 3.0%, nd O, of which 0.4 - 0.6% of the technical product of the preparation NGL-10 or NGL-11, the duration processing for 30 minutes, then, while the drum is rotating, sodium formate in the amount of 0.5-0.7% is added in the form of a 10% solution and the rotation is continued for 20 minutes, the pH of the bath at the end of treatment ki 3.5 4 0. Further processes: washing, neutralization, dyeing, greasing, performed according to the current procedure, after 40 minutes. 0,6-O, 8% titanium dioxide and rotation are continued for 20 minutes. Organic quenching of Guy is not performed. The results of the influence of the semi-finished product of chrome tanning from the medium hunt on the skin are given in the table. The effectiveness of the proposed method of podublivaniya-filling consists in imparting the same, completeness, reduction or elimination of skin looseness. Unlike organic tanning agents, poddublivanie by this method does not give the semi-finished product an additional color, but brightens the skin and can be used in the production of white skin, Unlike podblivaniya individual silicic acid Poddublivanie by this method eliminates the production of persistent or hard; leather does not reduce the strength of the skin and its facial layer.

Consumption of materials depending on the weight of planed leather,%:

silicic acid per 5VO

1.0

1.0

silicone liquid NGL-10,

sodium bicarbonate fatty substances

physico-mechanical indicators of the skin: the load at break, kg

crack load, kg

elongation with prhenzhen 1 kg / mm at break,%

apparent specific gravity, ghs

Content in the skin,% at a moisture content of O%: Phromy of the invention. The method of podblivanie - filling the skin with chrome tanning by treating them with organosilicon compounds, characterized in that, in order to reduce the cushioning of the skin, water is used as the organosilicon compound. a solution of silicic acid, modified silicon silicon fluid,

0.6

1.2 0.9

4.0 4.0

36.2

38.5

27.2

24.1 29.4

27.5 63.2

62.5

0.729

0.741 e.g. sodium polyethylsiliconate or sodium polymethylsiliconate for 3040 minutes. Sources of information taken into account during the examination: 1. Author's certificate No. 369139, class, C 14 Q H / OO, 1973. 2. Ovrutsky M. M; New methods for tanning hard leather, 1959, p. ZO-32.