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 1.8 to 2.2% by weight of the hide, and ammonium sulfate, 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 is the use of zirconium compounds containing a significant amount (about 10%) of insoluble substances, which leads to lower absorption of zirconium, as well as 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 with the consumption of sulfuric acid of 0.7-1.1% of the weight of the hide (100%), plating, tanning salvationdata soda is the complexity of processing. In this way of processing the ammonium sulfate used in 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 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 and reducing the complexity of the processing.

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

The essence of the method lies in the fact that pickling with an increased consumption of sulfuric acid creates the conditions for the penetration of the basic sulfate of zirconium in the hide, and toksikologi complex with a low degree of polymerization, which easily penetrate the hide. At the same time you have all the necessary conditions for the diffusion of chrome tanning agent. With increasing basicity, which is carried out at achieving Progresa as compounds of zirconium and chromium, is their simultaneous binding with the active groups of the collagen. While zirconium tanning takes place at a higher (compared to the prototype) the pH value, namely 2,2-2,5.

The use of sulfuric acid of less than 1.8 percent (100%) of the weight of the hide is not possible to create the necessary conditions for the diffusion of the basic sulfate of zirconium in the hide, and its consumption more than 2.2% will be excessive and will lead to additional consumption of neutralizing substances in the subsequent increase of basicity and neutralization.

The technology of the method is as follows: received on a standard methodology bassolino and washed the hide is subjected to pickling in W.to. of 0.8-1.0 and a temperature of 20-25aboutWith 1,8-2,2% sulfuric acid (100%) in the presence of 6-7% of ammonium sulfate for 4-5 hours Then carry out the tanning basic zirconium sulfate with a flow rate of 2.0 to 4.0% by weight of the hide, counting on zirconium dioxide, and chromium, with the consumption of chrome tanning agent is 0.5-0.7% by weight of the hide, counting on the oxide of harvesti with 0,5-1,0% of urotropine and 0.5-10, sodium sulfite in 2-3 hours

P R I m e R 1. Bassolino and washed the hide, obtained from byczyna heavy, Pikalevo when W.to. 0.8 and a temperature of 20aboutSulfuric acid with a flow rate of 1.8 percent (100%) by weight of the hide, in the presence of 6% ammonium sulphate for 5 hours Then spent tanning the basic zirconium sulfate with a flow rate of 2.0% by weight of the hide, counting on zirconium dioxide, and chromium, with the consumption of chrome tanning agent to 0.7% by weight of the hide, counting on the chromium oxide. Further, the processes and operations performed by standard methods.

P R I m m e R 2. Bassolino and washed the hide, obtained from rawhide average, Pikalevo as in example 1, except that the flow rate of sulfuric acid was 2.0% (100%) by weight of the hide. Then spent tanning the basic zirconium sulfate at a rate of 2.5% by weight of the hide, counting on zirconium dioxide, and chromium, with the consumption of chrome tanning agent to 0.6% by weight of the hide, counting on the chromium oxide. Further, the processes and operations performed by standard methods.

P R I m e R 3. Bassolino and washed the hide, obtained from the bull, Pikalevo as in example 1, except that the flow rate of sulfuric acid was 2.2% (100%). Then spent tanning the basic zirconium sulfate with a flow rate of 4.0% by weight of the hide, considered the further processes and operations carried out by standard methods.

P R I m e R 4. Bassolino and washed the hide, obtained from rawhide light, Pikalevo as in example 1, except that the flow rate of sulfuric acid was 1.7% (100%) by weight of the hide. Then spent tanning the basic zirconium sulfate with a flow rate of 2.0% by weight of the hide, counting on zirconium dioxide, and chromium, with the consumption of chrome tanning agent to 0.6% by weight of the hide, counting on the chromium oxide. Further, the processes and operations performed by standard methods.

P R I m e R 5. Bassolino and washed the hide, obtained from byczyna heavy, Pikalevo as in example 1, except that the flow rate of sulfuric acid was 2.3% by weight of the hide (100%). Then spent tanning the basic zirconium sulfate with a flow rate of 3.0% by weight of the hide, counting on zirconium dioxide, and chromium, with the consumption of chrome tanning agent to 0.6% by weight of the hide, counting on the chromium oxide. Further, the processes and operations performed by standard methods.

Characteristics of the obtained semi-finished product and produced from his skin are presented in table. 1.

Comparison of the proposed method and the prototype in relation to the consumption of chemical materials is given in table. 2.

The use of the proposed method of developing skin will significantly reduce the consumption of humiity duration of these processes (51.5-64 h (prototype) to 36-41 PM

The METHOD of manufacture of LEATHERS, including pickling pickling with sulfuric acid and ammonium sulfate, chromium and zirconium tanning tanning agent, characterized in that the pickling is carried out at a flow rate of sulfuric acid is 1.8 to 2.2% by weight of the hide, chrome plating and tanning takes place simultaneously, and as zirconium tanning agent, use the primary zirconium sulfate formula

Zr(OH)y(SO4)xnH2O,

where x 0,6 0,8;

y 4 2x;

n 1 10.

 

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