The way we produce leather

 

(57) Abstract:

The essence of the invention: method of manufacture of the leather hide pikelot sulfuric acid when the flow rate of 1.5 to 1.7% by weight of the hide and ammonium sulfate in the presence of aljumokalievyh alum, homeroot and tan basic zirconium sulfate of the formula Zr(OH)y(SO4)xnH2O where x is 0.6 to 0.8, y 4 2x n 1 10. table 2.

The invention relates to a method of chemical treatment of the hide and can be used in leather industry, mainly in the production of leather for bottom shoes.

There is a method of generation of leather, including the processing of zirconium tanning agent ZT-23 with subsequent processing of aliphatic amines number16-C18in the presence of phenol or cresol [1]

The disadvantage of this method lies in the use of zirconium compounds containing a significant amount (about 10%) of insoluble substances, which leads to lower absorption of zirconium, as well as in the use of toxic aliphatic amines, phenol or cresol.

The closest to the technical essence and the achieved effect is a way of encouraging skin, including pickling pickling at a flow rate of sulfuric acid of 0.7-1.1% of the weight of the hide, kramerova ashod chemical materials and large volume processing. If this way of handling ammonium is used when pickling and zirconium tannage with a flow rate of 6% by weight of the hide, and sodium sulfite with increasing basicity after plating and after zirconium tanning and to neutralize with the consumption of respectively 2 and 3-4% by weight of the hide. In addition, high consumption of sodium sulfite and urotropine is connected with the necessity of increasing the pH from 1.2 to 2.0 which is zirconium tanning, to 4.0, necessary for the subsequent retanning synthetic tanning agent.

The objective of the invention is to reduce the consumption of chemical materials, reducing the complexity of the processing and improve the absorption of the tanning compounds of zirconium and chromium.

This objective is achieved in that in the method of manufacture of leathers, including pickling, chrome plating and zirconium tanning, pickling is carried out at a flow rate of sulfuric acid 1,5-1,7% (100%) by weight of the hide, in the presence of 1-8% potassium alum and zirconium tanning carry out the basic zirconium sulfate of the formula Zz(OH)y(SO4)xnH2O, where x is 0.6 to 0.8, y 4 2x n 1 10.

 

Same patents:

FIELD: leather industry.

SUBSTANCE: solution is designed for use in furriery and clothing manufacture when performing correction of fur fells and cuttings of fur clothing. Solution contains sodium chloride, glycerol as plasticizer, inorganic and organic tanners, potassium alums, glyoxal, and water.

EFFECT: maximized area of fells and improved their quality.

2 cl, 1 tbl

FIELD: chemistry.

SUBSTANCE: titanium hydroxide containing 30-80% TiO2 is mixed with ammonium sulphate in weight ratio of 1:0.05-0.2 with respect to TiO2 and the obtained mixture is treated with sulphuric acid with concentration of 600-800 g/l H2SO4 with transfer of titanium into the solution. Ammonium sulphate is added to the titanium solution in weight ratio TiO2:(NH4)2SO4=1:3.5-5.5 to precipitate a double salt of ammonium and titanium sulphate. The precipitate is separated by filtering and washed with saturated ammonium sulphate solution with concentration of 400-450 g/l. The end product is obtained - a titanium tanning agent and a filtrate which contains ammonium sulphate which can be used when adding ammonium sulphate to the titanium solution. The method enables to obtain a titanium tanning agent from titanium hydroxide with high (94.7-97.6% TiO2) extraction of titanium and low content of iron impurities (0.01-0.025% Fe2O3).

EFFECT: method is less energy-consuming, cheap and is characterised by low consumption of ammonium sulphate.

3 cl, 4 ex

FIELD: chemistry.

SUBSTANCE: method involves pickling a hide, tanning with a titanium-aluminium tanning agent with particle size not greater than 50 nm in the presence of cationic fat, alkanising the treating solution in two steps: first with magnesium oxide and then with a mixture of sodium formate and sodium bicarbonate, pressing, shaping, retanning with a chrome tanning agent in the presence of cationic fat, dyeing and oiling processes, drying and finishing by depositing a clear prime coat and a pigment finish based on aqueous dispersions of acrylic copolymers and a pigment concentrate containing a nanosize pigment. Tanning with a titanium-aluminium tanning agent is carried out for 1.5-2.0 hours, alkanisation of the treating solution with magnesium oxide is carried out for 30-40 minutes, with a mixture of sodium formate and sodium bicarbonate - for 20-30 minutes and retanning with a chrome tanning agent is carried out for 40-60 minutes.

EFFECT: invention speeds up leather treatment processes and improves operational properties of titanium-aluminium tanned leather for the upper part of shoes.

3 tbl, 4 cl

FIELD: chemistry.

SUBSTANCE: sulphate titanyl-containing and aluminium-containing salts and ammonium sulphate are mixed. The sulphate titanyl-containing salt used is crystalline titanyl sulphate and the sulphate aluminium-containing salt used is aluminium-ammonium alum or aluminium sulphate. The components are mixed in weight ratio of TiO2:Al2O3:(NH4)2SO4=1:0.02-0.1:1.7-2.5 and then reacted in solid-phase mechanical activation mode while supplying energy at a rate of 2-5 kW-h/kg of the mixture for 15-50 minutes to form a tanning agent. Before reacting the components, water can be added to the mixture in an amount of not more than 3.5 wt % with respect to the weight of the mixture. The disclosed method is characterised by a 5.5 times shorter duration on average and enables to reduce consumption of ammonium sulphate 1.75-2.25 times while avoiding use of sulphuric acid. The obtained composite tanning agent with content of the active titanium component of 17.6-22.7 wt % with respect to TiO2 has basicity of 40-43.6%.

EFFECT: method is technologically effective and environmentally friendly.

3 cl, 8 ex

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