SU649757A1 - Method of processing semi-finished product for insole leather - Google Patents

Description

one

The invention relates to methods for the chemical treatment of moles, skins, and can be used in the leather industry for the production of baby skins from cattle skins.

There is a known method for producing semi-finished leather products from a split of a chrome-paint-sanded method of tanning, which consists in doubling, washing, de-ashing, secondary washing, pickling, chrome plating and tanning with vegetable and synthetic tanning materials 1.

However, this method is characterized by the use of scarce and expensive, their vegetable tanning agents, as well as insufficient wear resistance of stilechny skins.

A method of tanning is also known, which involves treating a mole after de-ashing and washing for 3-5 hours with a liquid ratio of 0.7-1.0 with titanium sulfate salts (2-3% by weight of a mole in terms of titanium dioxide) in the presence of sulfate ammonium (5-8% by weight of moles). After 3-5 hours, procoloration of the mol of titanium salts is achieved. Sodium sulfate zirconate and oak are added to the same bath for 36-48 hours from the start of the introduction of the titanium salts 2.

The closest to the proposed method is the production of leather, which consists in treating the asheshed gol with ammonium sulphate in an amount of 6-8% for 10-15 min, followed by tanning with 2.5-3.5% titanyl and ammonium sulphate, counting dioxide titanium, for 6–10 h. Zirconium tanning is carried out on the spent after titanizing bath with a zirconium tanning agent consumption of 5–6% by weight a mole, calculated on zirconium dioxide, for 36–48 hours 3.

A disadvantage of the known methods is the impossibility of tanning zirconium compounds with an ashless ash, since without

Pre-tptanirova “and the face layer is hardened.

The purpose of the invention is to intensify the process of treating the mole while shortening its duration.

This goal is achieved by the fact that in a known method, the processing of a duo of the lower split resulting from dividing is carried out in the same way with a liquid coefficient of 0.7-0.9 for 14-18 h with the following ratio of components, g / l:

Claims (3)

Ammonium sulphate Titanium tanning agent Zirconium tanning agent In this case, neutralization is carried out at a concentration of sodium sulfite and urotropine at 20-30 g / l, and retanning for 18-22 hours. A distinctive feature of the method is that the combination of ammonium sulfate treatment processes, titanium and zirconium tanning in one bath allows you to increase the intensity of the process and reduce the duration of tanning by 2-2.5 times. The technology of the method is as follows. The resulting lower split is the result of the double washing, de-ashting, washing again and treating in the same bath with a liquid ratio of 0.7-0.9% for 14-18 hours, with the following ratio of components: 50-70 g / l ammonium sulfate, 15-30 g / l titanium tanning agent and 40-70 g / l zirconium tanning agent followed by alkalinization with urotropine and sodium sulfite with a concentration of 10-15 g / l. Then, neutralization with urotropine and sodium sulfite with a concentration of 20-30 g / l for 5-6 hours, washing and retanning with synthans for 18-22 hours are carried out in a fresh bath. Example 1. The resulting lower splitting is done with . k. 1 and a temperature of 28 ° C for 20 min, completely disentangled with ammonium sulfate concentration of 20 g / l at W. k. 1 and a temperature of 25 ° C for 3 h and washed again at W. K. 1.5 and a temperature of 25 ° C to alkalinity of 0.5 g / l in terms of KOH. After that, zirconium and titanium are tanned in a fresh bath with the following parameters: concentration of zirconium tanning 40 g / l, calculated on zirconium dioxide, titanium 15 g / l, calculated on titanium dioxide, ammonium sulfate 50 g / l, g. k. 0.9, temperature 25 ° C, duration 14 h. After termination of tanning, the same bath is alkalized with 10 g / l sodium chloride and sodium sulfite to a pH of 2.5 for 2 h, followed by neutralization with fresh bathtub with urotropin and sodium sulfite concentration of 20 g / l, g. k. 1,2 and a temperature of 25 ° C for 5 h before the pH of the semi-finished product to 4.0. Then washed at 40 ° C and g. k. 1.5 for 20 min followed by retanning with syntans with a concentration of PO g / l at well. q. 1.0 and temperature 40 ° C for 18 hours. Bouquet of syntans: ATP-50%, N ° 2-25%, No. 12-25%. All subsequent processes and operations are carried out according to the method of production of the insole leather from the split of the chrome-plating method of tanning. The reduction in treatment time compared to nrotrotin is 39.5 hours. Example 2. The resulting split of the bug bottom split is processed for 16 hours, as in Example 1, but the zirconium tanning concentration is 55 g / l, based on zirconium dioxide, titanium 23 g / l, based on titanium dioxide, the concentration of ammonium sulphate 60 m / l, in addition, when alkalinizing and neutralizing, the concentration of urotropine and sodium sulfite is 15 and 25 g / l, respectively, and the duration is respectively 2.0 and 5, 5 h. Concentration of synthetic tanning agents 20 g / l, and the duration of retanning is 20 hours. Bouquet of syntans: ATP-50%, No. 1-30%, No. 2-20%. All subsequent processes and operations are carried out according to the method of production of insole leather from the split of the chrome-plating method of tanning. The reduction of the production cycle in comparison with the prototype is 41.6 hours. Example 3. The resulting split is processed as in Example 1 and 2. The distinctive features of this example are as follows: the concentration of zirconium tanning is 70 g / l, based on zirconium dioxide, titanium 30 g / l, based on titanium dioxide, ammonium sulphate 70 g / l, and the duration of tanning is 18 hours. and neutralizing the concentration of urotropine and sodium sulfite, respectively, 20 and 30 g / l, respectively, and the duration, respectively, 2 and 6 hours. When retanning, the concentration of synthetic tanning agents is 130 g / l, and the duration is 22 hours. Bouquet of syntans: No. 1-50%, № 2-25% № 12-25%. All further processes and operations are carried out according to the method for the production of foot skins from a split of a chrome-distinguished tanning method. The reduction of the production cycle in this case is 57.7 hours as compared with the prototype. As a result of the introduction of the proposed method into production, the production will be intensified and the production cycle will be reduced by 40-57 hours. Formula of the Invention neutralization with sulphite of sodium and urotropine with subsequent retanning with syntans, characterized in that in order to intensify the process, processing and tanning are in the same bath with a liquid ratio of 0.7-0.9 for 14-18 h with the following ratio of components, g / l: ammonium sulfate 50-70 Titanium tanning agent 15-30 Zirconium tanning agent 40-70 56 In this case, neutralization is carried out at con-1. “Method for the production of sterile concentration of sodium sulfite and split fiber urotropinages. M., 1965. at 20-30 g / l, and retanning over 2. USSR author's certificate 18-22 ch. No. 246768, class C 14C 3/04, 1967. Sources of information, 5 3. Gaidarov L.P. Skin technology. M ,, taken into account in the examination1974, p. 136-150. 649757