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Cow leather dyeing process

A process, cowhide technology, applied in dyeing method, small raw hide/large raw hide/leather/fur treatment, small raw hide/large raw hide/leather hide/fur chemical treatment, etc. Significant and other problems, to achieve the effect of easy operation and good color fixing

Inactive Publication Date: 2015-04-08
GUANGDONG FION LEATHER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dyeing process provided by these patents is not very effective in improving the fullness of dark dyes and the brilliance of light dyes. Therefore, further improvement is required.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A dyeing process for cowhide, including the following steps:

[0020] A. Backwater: First add 100% water to the drum, add 9% industrial salt, rotate for 20 minutes, control the Baume degree to 8, and then subcutaneously add 0.3% degreasing agent and 4% small Soda, rotate for 20 minutes, adjust the pH to 6.8, drain;

[0021] B. Retanning: Add 50% water, 0.5% dye amount, 0.2% dye auxiliaries, and rotate for 15 minutes into the drum; add 0.6% formic acid, control pH 3.5, rotate for 15 minutes, and add 3% chrome powder, rotate for 60 minutes ; Add 1.0% of sodium formate and 0.3% of baking soda, rotate for 30 minutes, drain and wash with water;

[0022] C. Filling and dyeing: first add 80% water, TRS 2%, macromolecular acrylic 3%, rotating for 40 minutes in the drum; NE 1.5%, DM 3%, rotating for 40 minutes; PR 2%, tannin extract 1%, dye 0.7 %, dye auxiliaries 0.2%, rotate for 60 minutes; finally add 0.8% formic acid, rotate for 30 minutes;

[0023] D. Add fat: make up water unt...

Embodiment 2

[0025] A dyeing process for cowhide, including the following steps:

[0026] A. Backwater: First add 110% water to the drum, add 11% industrial salt, rotate for 20 minutes, control the Baume degree to 8.5, and then subcutaneously add 0.5% degreasing agent and 6% small Soda, rotate for 20 minutes, adjust the pH to 7.0, and drain;

[0027] B. Retanning: first add 60% water, 0.6% dye amount, 0.4% dye auxiliaries, and rotate 15 minutes into the drum; add 0.9% formic acid, control pH 3.8, rotate 15 minutes, add 6% chrome powder, rotate 60 minutes ; Add 2.0% sodium formate, 0.35% baking soda, rotate for 30 minutes, drain and wash with water;

[0028] C. Filling and dyeing: first add 90% water, TRS4%, macromolecular acrylic acid 3% to the drum, rotate for 40 minutes; NE 2.0%, DM 4%, rotate for 40 minutes; PR2.5%, tannin extract 2%, dye 1.0 %, dye auxiliaries 0.3%, rotate for 60 minutes; finally add 0.9% formic acid, rotate for 30 minutes;

[0029] D. Filling: add water to a material-to-...

Embodiment 3

[0031] A dyeing process for cowhide, including the following steps:

[0032] A. Backwater: First add 105% water to the drum, add industrial salt 10%, rotate for 20 minutes, control the Baume degree to 8.3, and then subcutaneously add 0.4% degreasing agent and 5% small Soda, rotate for 20 minutes, adjust the pH to 7.0, and drain;

[0033] B. Retanning: first add 55% water, 0.55% dye amount, 0.3% dye auxiliaries to the drum, rotate for 15 minutes; add 0.75% formic acid, control pH 3.6, rotate for 15 minutes, add 4.5% chromium powder, rotate for 60 minutes ; Add 1.5% sodium formate and 0.33% baking soda, rotate for 30 minutes, drain and wash with water;

[0034] C. Filling and dyeing: first add 85% water, 3% TRS, 3% macromolecular acrylic acid to the drum, rotating for 40 minutes; NE 1.75%, DM 3.5%, rotating for 40 minutes; PR 2.3%, tannin extract 1.5%, dye 0.9 %, dye auxiliaries 0.25%, rotate for 60 minutes; finally add 0.8% formic acid, rotate for 30 minutes;

[0035] D. Filling: ...

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PUM

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Abstract

The invention relates to a cow leather dyeing process, belonging to the technical field of dyeing processing of leather materials. A preparation process comprises the following steps: returning water, namely adding water and industrial salt into a rotary drum; controlling baume degree; stripping leather; sequentially adding a de-greasing agent and baking soda in sequence after stripping the leather; rotating and adjusting pH; discharging a solution and carrying out a retanning procedure; after retanning, filling and adding grease; and then discharging water, washing with water and discharging from the drum. The process has the advantages that the use amount of dyes is few, the dye absorptivity is greatly improved and the environment pollution is alleviated; the plumpness of deep-color dyes and the brightness of light-color dyes can be effectively improved; and the cow leather dyeing process has the advantages in the aspects of dyeing rate, leveling property, permeability, color fastness and the like.

Description

technical field [0001] The invention relates to a dyeing process of cowhide, in particular to a dyeing method of cowhide for leather, and belongs to the technical field of leather material processing. Background technique [0002] Leather is denatured and non-perishable animal skin obtained through physical and chemical processing such as depilation and tanning. China's leather industry, after adjusting and optimizing its structure, has initially formed a number of leather production characteristic areas and professional markets throughout the country with clear division of labor, outstanding characteristics, and playing a decisive role in stimulating the local economy. Their formation has laid the foundation for the development of China's leather industry. [0003] Leather is classified according to animal sources, mainly including pig leather, cow leather, sheep leather, horse leather, donkey leather and kangaroo leather, and a small amount of fish leather, reptile leathe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P3/32D06P1/44D06P1/52D06P1/46D06P1/653C14C3/04
Inventor 林斌生
Owner GUANGDONG FION LEATHER CO LTD
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