SU1694645A1 - Method of manufacturing leather for footwear bottom - Google Patents

Abstract

The invention relates to the leather industry and improves the quality of the skin, reducing the amount of wastewater and the content of harmful substances. The washed out peel is successively treated without adding water with dry chemical materials: 2% ammonium sulphate and 1.0% oxalic acid, after 1 h 1.6 to 4.5% formic or acetic acid, through 1chsintane NC and dispersant NP (4% ), then 1.5 hours later with mineral tanning agents for 3 hours. After washing and draining the liquid, tanning is carried out with organic tanning agents for 10-14 hours at a rate of 20-22% by weight a mole using organic tanning agents in the form of powder or crumbs. When used as organic tanning agents, the syntans for 1 h before the end of tanning fall asleep potassium alum in the amount of 3% and oxalic acid - 0.5% by weight of the mole. 1 hp f-ly, 4 tab. (Ls

Description

The invention relates to the leather industry and can be used in making leather for the bottom of shoes.

The purpose of the invention is to improve the quality of the skin, reducing the amount of wastewater and the content of harmful substances in them.

The essence of the invention is. that according to the method of making leathers for the bottom of the shoe, including washing, treating with ammonium sulfate, preparation of neutralized naphthalene sulfonic acid condensation product and acid, chroming and tanning with organic tanning agents in three steps, sulphate treatment

ammonium is carried out in the presence of oxalic acid without adding water, the acid is injected before the preparation of the neutralized condensation product of naphthalenesulfonic acid, formic or acetic acid is used, and tanning with organic tanning agents is carried out for 10-14 hours at a rate of 20-22% by weight mole using organic tanning agents in powder or crumb form.

The method is carried out as follows.

The washed hide is loaded into the drum, successively processed without the addition of

sO

4 O b SL

laziness of water with dry chemical materials: ammonium sulfate (2.0%) and oxalic acid (1.0%), treatment time 1 h, formic or acetic acid (1.6 - 4.5%), duration 1 h, sintan NK or dispersant NP (4%) duration 1.5 hours, mineral tanning agents, for example chrome tanning agent (0.3% based on chromium oxide), duration 3 hours. Washing was performed at 1.0, temperature 28 ° C, duration 20 min

After thoroughly draining the liquid, tanning is carried out with organic tanning agents loaded into the drum in the form of a powder or crumb: 4% of syntan BNS, processing 40 min; 10% ram extract, processing .40 min, 6% syntan SLS, total duration 12 h.

Instead of a tanning agent, rammers with the same consumption of tanning ones use synthetic tanning agents, for example, Sintan BNS, one hour before the end of tanning, aluminum potash alum (3%) and oxalic acid (0.5%) are poured into the drum.

Environmental and economic characteristics of the processes are presented in Table 1.

The dependence of the quality indicators of finished leather on the duration of tanning, total consumption and staging of giving tanning agents in tanning is presented in Tables 2–4.

Examples 1 and 5, according to the technological parameters beyond the limits specified in the claims, are characterized by worse indicators of the quality of the skin as compared with the proposed method.

Thus, the application of the proposed method in comparison with the prototype provides:

technological process intensification:

the absence of waste chemical solutions, technological operations, special training and tanning solutions;

no need for chemical stations and other ancillary workshops, since all materials are metered in powder or crumb form;

reduction of labor intensity of the production cycle, all operations are performed in one drum without overloading;

production of high quality leather and a diverse range according to customers;

a significant reduction in wastewater and the content of harmful substances in them.

Claims (2)

1. A method of making leathers for the bottom of shoes, including washing, processing ammonium sulphate, a preparation of a neutralized naphthalene sulfonic acid condensation product and kiolot, chrome plating and tanning with organic tanning agents in three reception, characterized in that, in order to improve the quality of the skin, reduce the amount of wastewater and the content of harmful substances in them, the treatment with ammonium sulfate is carried out in the presence of oxalic acid without adding water, the acid is injected before the preparation of the neutralized product of naphthalene sulfonic acid formic or acetic acid is used, and tanning with organic tanning agents is carried out for 10-14 hours at a flow rate of 20-22% by weight a mole, using organic tanning agents in the form of powder or crumb. 2. A method according to claim 1, characterized in that as organic tanning agents - Synthetic tanning agents are used, while for one hour before the end of tanning, potash alum and oxalic acid are poured into the drum in an amount of 3% and 0.5% by weight of mole, respectively. Table 1 Environmental and economic characteristics of processes Table 2 The effect of the duration of tanning on the quality indicators of a semi-finished product at a consumption of tanning materials 22% of masses of mole Ultimate tensile strength w 10 MPa2.0 Svarivion temperature, С 86 2, k 2, k 2, k Z, k 88 90 90 90 The effect of the consumption of tanning agents on the quality indicators of the semi-finished product with a tanning time of 12 hours Table The effect of the phased dosage of tanning agents on the quality indicators of the semi-finished product at a consumption of tanning agents of 22% by weight mole Table3