Method for the production of leather for shoe upper

 

(57) Abstract:

The method is concerned with the obtaining of leather for the uppers. Semi-finished leather is treated as azo-components of the dye solution modificata of metacid-guanidine. Then the solution is injected dry salt page. The latter is obtained on the basis of sulfanilic acid, n-nitro-aniline, naphtylamine. The technical result is the intensification of dyeing and greasing processes, reducing water consumption, labor, and improving product quality. table 1.

The invention relates to light industry, in particular to leather manufacture, and can be used in the production of leather for the uppers.

Known combined methods for dyeing and greasing processes (Chursin Century. And. Study the possibility of using water-soluble colored BGAF resins in the production of leather //Leather and footwear industry, 1988, N 3), when the treatment is used the material with complex technological properties (with tanning and dye effect). A feature of this technology is the application of the coloring tanning agent prepared before the processing of semi-finished leather.

Napoletani colored product, when receiving the coloring matter is in the working solution in the dyeing velour - "fiber" (Finish leather. Ed. insurance I. P. - M.: Light and food industry, 1983). The disadvantage of this option is the need for rotation of alkaline and acid treatments of semi-finished when the temperature drops to 10-12oC directly in the working apparatus, which is connected with the possibility of defects of products, a high consumption of water and technical difficulties.

The aim of the invention is to intensify dyeing and greasing processes, reducing water consumption, labor costs, improve product quality. This objective is achieved in that in the method of production of leather for Shoe upper, comprising the azo coupling components in the dermis and staining, as disasstable apply dry salt, page obtained on the basis of sulfanilic acid, n-nitro-aniline, naphtylamine (you can use other), as well as combining components used modificat of metacid - guanidine. Dry salt page is used to avoid abrupt temperature reduction processing.

The proposed method consists assy party, counting on the dry matter. Modificat is served in the form of a solution in one step. After rotation of the device within 30-60 min the pH of the working solution was adjusted to about 7 by the addition of alkali. Further, in the device go to sleep dry salt page at 1-2%. The working solution and the semi-finished product immediately get a bright color. The duration of the dyeing to 1 hour, and then in the same solution is greasing whose parameters match the standard method. The retanning process-filling or synthetic organic tanning agent is excluded, as the polyfunctional modifier metacid has tanning and filling properties. The neutralization process, which is usually before a typical dyeing, also excluded from technology, because the combined component - modificat of metacid is required to process the pH value of about 4.

Dry salt, page obtained as follows.

In the reaction flask contribute 2.5 g of sulfanilic acid, dissolved by heating in 6.5 ml of 2n. the sodium hydroxide solution, and then injected with 1 g of sodium nitrite in 12 ml of water. The reaction mixture is cooled to 10oC, put in the flask with 13 ml of 2n. hydrochloric acid solution. The resulting bright yellow on the-nitroaniline and other datacomponents.

The essence of the methods of processing semi-finished product shown in the table.

Semi-finished leather after dyeing and greasing process is intense, uniform color, cut and painted almost the entire thickness. For sensory assessment of the prefabricated soft, full, with no grease. Temperature welding after treatment is increased by 3-5oC, the thickness is increased to 20% in dry bulk. Viviremos dye from the solution, more than 80%. The total duration of dyeing and greasing processes does not exceed 4 hours.

After testing the material found that the coloration is very resistant to dry and wet friction (more than 1500 rpm when you abrasion dry, 500 revolutions in the wet).

Method for the production of leather for Shoe upper, comprising the azo coupling components in the dermis and staining, characterized in that as disasstable apply dry salt, page obtained on the basis of sulfanilic acid, n-nitro-aniline, naphtylamine, as well as combined components used modificat of metacid-guanidine.

 

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