A method for dyeing anionic dyes used in the production of two-layer organic tanned leather

An anionic dye and leather technology, applied in the field of leather processing technology, can solve the problems of inactivation, etc., and achieve the effect of good washability, good humidity and heat stability, uniform and rich color tone

Inactive Publication Date: 2016-08-24
湖南省怀其皮革集团制革有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this higher reactive state is easily deactivated by "passivation" under the action of the environment (oxygen, impurities, etc.) and its own interaction.

Method used

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  • A method for dyeing anionic dyes used in the production of two-layer organic tanned leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Pigskin two-layer brown shoe lining dyeing tanned with glutaraldehyde

[0019] After the tanning is completed, squeeze water, drop lightly for 10 minutes, cut it to a thickness of 1.0 mm, and weigh it as 100%.

[0020] Into the drum, wash with 150% normal temperature water for 10min, pH is ~ 6.0. Rinse with 0.2%~0.3% oxalic acid for 20min, measure pH to be 4.2~4.5, drain.

[0021] Add 60°C water into the drum to achieve a liquid ratio of 1.5, the internal temperature is 50°C, rotate for 10 minutes, and the pH of the bath solution is measured to be 4.3.

[0022] Add 4% sodium carboxymethyl cellulose, rotate for 30min; add 1% sodium perborate, rotate for 30min, drain; add 60℃ water into the drum, adjust the liquid ratio 1.5, inner temperature 50℃, add 2% direct dark brown (domestic commercial dyes), rotate for 30min, the dyeing rate is 90%. Add 6% sulfated vegetable oil and 6% synthetic oil (domestic commercial leather fatliquor), emulsification at 60°C) and ...

Embodiment 2

[0023] Example 2 Dyeing of two-layer gray glove leather of cowhide tanned with modified glutaraldehyde

[0024] After the tanning is completed, squeeze water, drop lightly for 10 minutes, shave evenly to a thickness of 0.8 mm, and weigh as 100%. Into the drum, wash with 150% normal temperature water for 10 min, pH is ~ 6.5. Rinse with 0.3% oxalic acid for 20min, measure pH to be 4.2, drain.

[0025] Add 60°C water into the drum to achieve a liquid ratio of 1.5, the internal temperature is 50°C, rotate for 10 minutes, and the pH of the bath solution is measured to be 4.1.

[0026] Add 4% soluble corn starch, rotate for 30min; add 1% cerium ammonium sulfate, rotate for 30min, drain; then add 60 ℃ water into the drum, adjust the liquid ratio 1.5, the inner temperature is 50 ℃, add 2% direct dark brown (domestic Commercial dyes), rotating for 30min, the dyeing rate is 90%. Add 6% sulfated vegetable oil and 6% synthetic oil (domestic commercial leather fatliquor), emulsify at 60...

Embodiment 3

[0027] Example 3 Dyeing of thin pigskin two-layer light black lining leather tanned with glutaraldehyde and white synthetic tanning agent

[0028] First tanned with glutaraldehyde, and then re-tanned with white synthetic tanning agent. After the tanning is completed, squeeze water, lightly drop for 10 minutes, shave evenly to a thickness of 1.0 mm, and weigh as 100%. Into the drum, wash with 150% normal temperature water for 10min, pH=3.8. Rinse with 0.2%~0.3% baking soda for 20min, measure pH to 4.2, drain.

[0029] Add 55°C water into the drum to achieve a liquid ratio of 1.5, the internal temperature is 45°C, rotate for 10 minutes, and the pH of the bath solution is measured to be 4.3.

[0030] Add 4% sodium carboxymethyl cellulose, rotate for 30min, add 1% sodium perborate, rotate for 30min, drain; add 55°C water into the drum, adjust the liquid ratio to 1.5, the inner temperature is 45°C, add 1% direct dark brown With 1% acid black dye (domestic commercial dye), rotatin...

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Abstract

The invention discloses a method for dyeing anionic dye in two-layer organic tanning leather production. The method comprises the following steps: putting blank leather required to be dyed or blank leather after being dyed in a rotation drum; adjusting the pH value of the drum to be 4.0-5.0, the liquid ratio to be 1.0-1.5, and the temperature to be 45-55 DEG C; adding an auxiliary 1; rotating for 20-30min; adding an auxiliary 2; rotating for 20-30min; discharging liquid; adding liquid so as to enable the liquid ratio to be 1.0-1.5, and the temperature to be 45-55 DEG C; adding the anionic dye for dyeing for 30min; and performing following steps after dyeing. The method is easy to operate, and low in running cost, and after being dried, a cover is good in hydrothermal stability, uniform and bright-coloured in color tone, and good in washability.

Description

technical field [0001] The invention relates to a leather processing technology, in particular to a method for dyeing an anionic dye used in the production of two-layer organic tanned leather. Background technique [0002] Generally speaking, it is easier to dye chrome tanned hides with anionic dyes. In recent years, aldehyde tanning (formaldehyde, glutaraldehyde, modified glutaraldehyde, oxazolidine, etc.) and white synthetic tanning agent tanning are increasingly used in the manufacture of leather products that come into contact with the skin. These suede leathers cannot be chrome tanned or other metal tanning agents, but they need to be dyed to increase the variety of colors to improve the grade. These two-ply leathers are commonly used in the manufacture of suede, glove, and children's leathers, and are characterized by large surface areas and large pore sizes of collagen fibers. Usually leather dyeing requires anionic dyes. Therefore, for aldehyde tanning (formaldehy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P3/32D06P1/00D06P1/48D06P1/673
Inventor 周鑫樑王力武单志华陈慧
Owner 湖南省怀其皮革集团制革有限公司
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