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Leather retanning method and crust leather prepared by using leather retanning method

A technology for leather and wet blue leather, applied in the field of leather retanning, which can solve problems such as environmental pollution

Active Publication Date: 2019-08-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the chrome tanning process, a large amount of trivalent chromium is discharged without being absorbed, causing certain pollution to the environment

Method used

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  • Leather retanning method and crust leather prepared by using leather retanning method
  • Leather retanning method and crust leather prepared by using leather retanning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The leather retanning method of the present invention specifically includes the following steps:

[0044] (1) Material: Weigh the wet blue leather of sheep apparel, and the amount of reagent in the subsequent steps is expressed as a percentage of the weight.

[0045] (2) Backwater: Put the wet blue leather in a rotating drum, add 200wt% water, 1wt% degreasing agent DT, adjust the temperature to 25°C, and drain the liquid after rotating for 30 minutes.

[0046] (3) Water washing: Add 200wt% of water to the drum, adjust the temperature to 25°C, and drain the liquid after rotating for 10 minutes.

[0047] (4) Neutralization: Add 100wt% of water to the drum, then add 1wt% of neutralizer NT and 0.5wt% of baking soda to adjust the pH to 5.5, adjust the temperature to 25°C, and rotate the liquid for 150 minutes. discharge.

[0048] (5) Water washing: Add 200wt% water to the drum, adjust the temperature to 25°C, and discharge the liquid after rotating for 10 minutes.

[0049] (6) Retanni...

Embodiment 2

[0057] The leather retanning method of the present invention specifically includes the following steps:

[0058] (1) Material: Weigh the wet blue leather of sheep apparel, and the amount of reagent in the subsequent steps is expressed as a percentage of the weight.

[0059] (2) Backwater: Put the wet blue leather in a rotating drum, add 300wt% water, 1.5wt% degreasing agent DT, adjust the temperature to 35°C, and drain the liquid after rotating for 40 minutes.

[0060] (3) Water washing: 300wt% water is added to the drum, the temperature is adjusted to 35°C, and the liquid is discharged after rotating for 30 minutes.

[0061] (4) Neutralization: Add 200wt% of water to the drum, then add 2wt% of neutralizer NT and 1wt% of sodium formate to adjust the pH to 5.8, adjust the temperature to 40°C, and discharge the liquid after rotating for 180 minutes.

[0062] (5) Water washing: Add 300wt% water to the drum, adjust the temperature to 40°C, and discharge the liquid after rotating for 20 minu...

Embodiment 3

[0071] The leather retanning method of the present invention specifically includes the following steps:

[0072] (1) Weighing: Weigh the wet blue leather of sheep apparel, and the amount of reagent in the subsequent steps is expressed as a percentage of the weight.

[0073] (2) Backwater: Put the wet blue leather in a rotating drum, add 150wt% water, 0.5wt% degreasing agent DT, adjust the temperature to 20°C, and drain the liquid after rotating for 20 minutes.

[0074] (3) Water washing: add 350wt% water into the drum, adjust the temperature to 20°C, and drain the liquid after rotating for 20 minutes.

[0075] (4) Neutralization: Add 150wt% of water to the drum, then add 3wt% of neutralizer NT and 2wt% of sodium formate to adjust the pH to 5, adjust the temperature to 30°C, and discharge the liquid after rotating for 200 minutes.

[0076] (5) Water washing: Add 250wt% water into the drum, adjust the temperature to 30°C, and drain the liquid after rotating for 15 minutes.

[0077] (6) Ret...

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Abstract

The invention discloses a leather retanning method. The leather retanning method comprises the steps of rewetting, washing, retanning, stuffing and the like, and finally, crust leather is prepared. Inthe step of retanning, almond bran tanning extracts are added for retanning, so that the crust leather prepared by using the method is compact in leather body, full in grain side and light in color,and the tensile strength and the tear strength of the crust leather are higher than those of crust leather prepared from BA tanning extracts through retanning. Besides, the shrinkage temperature of the crust leather prepared by using the method is slightly higher than that of the crust leather prepared from the BA tanning extracts, the thickening rate of the crust leather prepared by using the method is much higher than that of the crust leather prepared from the BA tanning extracts, it is shown that the almond bran tanning extracts can well enter the crust leather, multi-point crosslinking between the almond bran tanning extracts and collagenous fibers is generated, and therefore, the performance of the crust leather is improved.

Description

Technical field [0001] The invention relates to the technical field of leather retanning, in particular to a leather retanning method and crust leather prepared by the method. Background technique [0002] my country is a big country in leather production. About 10% of the world's leather products are produced in China. The tanning industry has brought good economic benefits to our country, but also caused a certain amount of environmental pollution. Because chrome tanned leather has excellent properties such as softness, plumpness, and high humidity and heat resistance, chrome tanning currently plays a dominant role in main tanning and retanning. However, in the chrome tanning process, a large amount of trivalent chromium is discharged without being absorbed, causing certain pollution to the environment. In recent years, with the development of economic globalization and people's increasing awareness of environmental protection, more and more tanners have turned their attentio...

Claims

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Application Information

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IPC IPC(8): C14C3/12
CPCC14C3/12
Inventor 马养民杜凯郭林新雷瑞
Owner SHAANXI UNIV OF SCI & TECH
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