The way of processing leather leather for shoe upper

 

(57) Abstract:

The method refers to the leather industry and can be used for processing of leather for Shoe uppers in order to give the necessary quality - water resistance. After tanning, fatliquoring and dyeing, i.e., before finishing leather, pre-treated with an aqueous solution of the latex type LFM-3 during the dry matter content of 1.28-of 20.6 wt.%, to a state of opacity. The technical result is the improvement of the water resistance of the leather.

The invention relates to the leather industry and can be used for processing of leather for Shoe uppers in order to give them the necessary quality - water resistance.

There is a method of finishing (1), which is carried out using complex composition, containing a latex of a copolymer 1.1-dehydrophenylalanine N-methylolmethacrylamide.

Disadvantages: handling method is acceptable only for leather from the skins of dairy calf skin virostko, half, not leather, which is different from the above completely different structure; insufficient high water treated in this way hides under dynamic conditions.

The closest rassmatrivatbsya by applying the emulsion coating. According to this method get splits in the ghosting tanned semi-finished product from the skins of cattle, followed by the above operations, then filling, drying, grinding and finishing emulsion-based coating composition of the Compound H1", which includes acrylate latexes.

Cons: one of the major drawbacks - low water-resistant properties of the treated skin (3-19 min).

The task of improving the water resistance of the treated skin. The essence of the proposed technical solution is that after the usual stages of the technological cycle: tanning, fatliquoring, dyeing, i.e., before the final finish of the skin, pre-treated with an aqueous solution of the latex type LMP-3 copolymer of 1,1-dehydrophenylalanine N-methylolmethacrylamide concentration of 1.28-of 20.6 wt.% in terms of dry residue.

The method is as follows: prefabricated skin after stage dyeing and releasing it from moisture is applied by spraying an aqueous solution of a latex of a copolymer type LMP-3 to a state of opacity, stand first on the air for complete impregnation of the leather latex (within 30 min), then in the dryer or drying Cabinet at 90-S in the course is elali on the device HPH-2 according to GOST 938-22-71.

EXAMPLE 1

A sample of skin the size 9080 mm split leather uppers colours 138, black, chrome method of tanning, put a solution of latex LFM-3 content of 10.3 wt.% the dry residue by spraying, for example, by means of a spray at room temperature to a state of opacity. After aging in air for 30 min, the sample is dried in an oven for 20-25 minutes

Tests of the thus treated sample of the skin on the device HPH-2 showed that vodopronitsaemosti in dynamic conditions was 54 minutes

EXAMPLE 2

The conditions of example 1, but when the concentration of the latex of 1.28 wt.%, vodopronitsaemosti in dynamic conditions was 26 minutes

EXAMPLE 3

Under the conditions of example 1, but when the concentration of the latex of 20.6 wt.%, vodopronitsaemosti amounted to 120 minutes

EXAMPLE 4

Upon decrease of the concentration of the latex to 0.64 wt.% vodopronitsaemosti decreased to 6.7 minutes

As can be seen from the examples, the optimal concentrations of the latex is in the amount of 1.28 - of 20.6 wt.% the dry residue that provides a significant increase in the rate of vodopronitsaemosti (known control 3-19 min).

the, before final finishing, dry skin pre-treated by spraying an aqueous solution of latex type LFM-3 copolymer of 1,1-dihydroergocryptine N-methylolmethacrylamide concentration of 1.28-of 20.6 wt.% the dry residue, to the point of opacity.

 

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FIELD: leather industry.

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1 tbl, 5 ex

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1 tbl, 15 ex

FIELD: light industry; methods of forming of volumetric and curvilinear details for an article.

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EFFECT: the invention ensures improvement of quality of the articles made out of leather due to increased the form stability of components of the article.

4 cl

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1 tbl, 19 ex

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1 tbl, 6 ex

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13 cl, 1 dwg, 1 ex

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1 dwg, 1 tbl

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