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A kind of tanning process and its application for multi-component chrome-free combined tanned cow white leather

A technology of combined tanning and wet white leather, applied in the field of multi-component chrome-free combined tanned cow white leather technology, can solve the problems that chrome-free tanning is difficult to combine and use, and achieve the effect of basic thickness, poor antibacterial performance and excellent performance

Active Publication Date: 2022-04-26
XINGYE LEATHER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present application provides a multi-component chrome-free combined tanning process for ox white wet leather, which solves the technical problem that the chrome-free tanning system in the prior art is difficult to use in combination, and realizes that the heat shrinkage temperature of wet white leather exceeds 90°C, which is much higher than The standard requirement of 80℃ for chrome-free tanned shoe upper leather meets the technical effects such as shoe-making process needs

Method used

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  • A kind of tanning process and its application for multi-component chrome-free combined tanned cow white leather
  • A kind of tanning process and its application for multi-component chrome-free combined tanned cow white leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A multi-component chrome-free combined tanning process for wet white cow leather, at least comprising the following steps:

[0042] Step 1: Preparation of cyclodextrin polyaldehyde derivative MACD:

[0043] Step (1): Dissolve 1 mmol of cyclodextrin in 10 mL of dimethyl sulfoxide to obtain solution A (denoted as 1 part of solution A);

[0044] Step (2): Dissolve 1.2mmol o-iodobenzoic acid in 12mL dimethyl sulfoxide to obtain solution B (denoted as 1 part of solution B);

[0045] Step (3): Add solution B dropwise to solution A, and react for 24 hours to obtain solution C;

[0046] Step (4): Add solution B dropwise to solution C;

[0047] Step (5): Repeat step (4) once to obtain a mixed solution; [at this time, the mixed solution contains 1 part of solution A and 3 parts of solution B]

[0048] Step (6): filter the mixture, drop the filtrate into 200-500ml acetone, and stir at 4°C for 2h;

[0049] Step (7): Centrifuge the step (6) with a refrigerated centrifuge, dissolve...

Embodiment 2

[0064] A multi-component chrome-free combined tanning process for wet white cow leather, at least comprising the following steps:

[0065] Step 1: Preparation of cyclodextrin polyaldehyde derivative MACD:

[0066] Step (1): Dissolve 1 mmol of cyclodextrin in 15 mL of dimethyl sulfoxide to obtain solution A (denoted as 1 part of solution A);

[0067] Step (2): Dissolve 1.2mmol o-iodobenzoic acid in 8mL dimethyl sulfoxide to obtain solution B (denoted as 1 part of solution B);

[0068] Step (3): Add solution B dropwise to solution A, and react for 24 hours to obtain solution C;

[0069] Step (4): Add solution B dropwise to solution C;

[0070] Step (5): Repeat step (4) twice to obtain a mixed solution; [at this time, the mixed solution contains 1 part of solution A and 4 parts of solution B];

[0071] Step (6): filter the mixture, drop the filtrate into 200-500ml acetone, and stir at 4°C for 2h;

[0072] Step (7): Centrifuge the step (6) with a refrigerated centrifuge, disso...

Embodiment 3

[0085] A multi-component chrome-free combined tanning process for wet white cow leather, at least comprising the following steps:

[0086] Step 1: Preparation of cyclodextrin polyaldehyde derivative MACD:

[0087] Step (1): Dissolve 1 mmol of cyclodextrin in 10 mL of dimethyl sulfoxide to obtain solution A (denoted as 1 part of solution A);

[0088] Step (2): Dissolve 1.2 mmol o-iodobenzoic acid in 15 mL dimethyl sulfoxide to obtain solution B (recorded as 1 part of solution B);

[0089] Step (3): Add solution B dropwise to solution A, and react for 24 hours to obtain solution C; [at this time, solution C contains 1 part of solution A and 1 part of solution B]

[0090] Step (4): Filter solution C, drop the filtrate into 200-500ml acetone, and stir at 4°C for 2h;

[0091] Step (5): Centrifuge step (4) with a refrigerated centrifuge, dissolve the filter residue with deionized water, filter, and then freeze-dry the filtrate to obtain cyclodextrin polyaldehyde derivatives.

[009...

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Abstract

The invention discloses a tanning process for multi-component chrome-free combined tanned cow white leather, comprising the following steps: tanning A → tanning B → tanning C; the specific steps of the tanning A are: controlling the liquid ratio in the drum to be 0.3‑0.5, add 2‑6% synthetic tanning agent, turn; add 2‑6% synthetic tanning agent, turn; add 30% water, increase the temperature in the drum for the first time, turn; add 30% water, Increase the temperature in the drum for the second time, control the pH to 4.5-5.0, rotate, and drain; the specific steps of the tanning B are: control the liquid ratio in the drum to 0.3-0.5, adjust the pH to 4.0-4.5, add dispersing Tannin 1‑2%, oil 0.5‑1.5%, auxiliary agent 0.1‑0.3%, turn, add tannin extract 5‑15%, turn; continue to add tannin extract 15‑25%, oil 1‑2%, auxiliary agent 0.1 -0.3%, rotate; stop the drum for 3-5h; rotate, add 100% water at 45°C, add 1% formic acid and rotate for 30min; then add additive 0.2-0.5%, rotate; pH3.4-3.6, drain; The specific steps of the tanning C are as follows: control the liquid ratio in the drum to 0.5-0.6, the water temperature to 30-32°C, rotate, adjust the pH to 2.8-3.0, add 1% fatliquoring agent, and rotate.

Description

technical field [0001] The invention relates to the technical field of leather production, in particular to a process for multi-component chrome-free combined tanning of wet white cow leather. Background technique [0002] Tanning is the key to tanning. During the tanning process, the skin collagen fibers are combined with the tanning agent, and the properties change fundamentally, from leather to leather. Since Friedrich Knapp discovered that chrome has tanning properties in 1858, more than 90% of the leather has been used for chrome tanning because it can give the finished leather a plump and flexible feel, good moisture and heat resistance stability, and good mechanical properties such as abrasion resistance and elongation. Chrome tanning agent tanning. However, hexavalent chromium is carcinogenic and chrome tanning agents cannot be completely absorbed. Chromium pollution seriously restricts the development of the leather industry. [0003] The chrome-free tanning syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C1/08C14C1/06C14C1/04C14C3/16
CPCC14C1/08C14C1/065C14C1/04C14C3/16
Inventor 温会涛但卫华牛泽陈永榜李银生孙辉永
Owner XINGYE LEATHER TECH CO LTD
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