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Black leather tanning method

A kind of tanning and leather technology, applied in the direction of small raw hide/big raw hide/leather/fur treatment, tanning treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, etc., which can solve the problem of large K/S curve fluctuations, Problems such as leather color difference and simultaneous dyeing of black leather have not been realized, and the effects of shortening the production cycle, fine grain, and excellent color fastness are achieved.

Inactive Publication Date: 2009-03-04
JIAXING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the leather obtained by tanning using this method still needs to use synthetic dyes to obtain darker leather, and it has not been realized that black leather is dyed synchronously during the tanning process.
Cheng Fengxia and others (Cheng Fengxia et al., Research on the color and luster and performance of chrome-iron-vegetable tanned leather, China Leather, 2006, 35(3):25-26, 35(5):9-13) studied the chromium-iron salt The influence of tanned leather with 10 kinds of vegetable extracts on leather, although black leather can also be obtained, but the K / S curve fluctuates greatly, resulting in a large color difference of leather

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Embodiment 1, plant-chromium-iron (T-Cr-Fe) process tanning, using chestnut extract 3% (W / W), powdery chrome tanning agent equivalent to Cr 2 o 3 1.0% (W / W), iron tanning agent equivalent to Fe 2 o 3 0.3% (W / W), according to the following process steps:

[0056] 1. Make pickling bare hide with the conventional process of tanning. Weigh the pickled bare hide, and use 150% of the weight obtained as the benchmark for the amount of water and chemical materials used in steps 2-4.

[0057] 2. Deacidification. Add normal temperature tap water 100% (W / W) to the drum, add salt 10% (W / W), rotate the drum to dissolve the salt, add pickled skins into the drum, start rotating the drum, and the total time of rotation for 90 minutes. Use the methyl orange indicator to check that the incision of the skin plate is yellow, and the pH value of the operating solution should be in the range of 4.5-5.0.

[0058] 3. First add tanning agent 1 for initial tanning. The tanning agent 1 is...

Embodiment 2

[0065] Embodiment 2, plant-chromium-iron process tanning, using chestnut extract 8% (W / W), powdery chrome tanning agent equivalent to Cr 2 o 3 2.2% (W / W), iron tanning agent equivalent to Fe 2 o 3 1.3% (W / W), according to the following process steps:

[0066] 1. Make pickling bare hide with the conventional process of tanning. Weigh the pickled bare hide, and use 150% of the weight obtained as the benchmark for the amount of water and chemical materials used in steps 2-4.

[0067] 2. Deacidification. Add normal temperature tap water to the drum, add NaCl 10% (W / W, percentage by weight), rotate the drum to dissolve the NaCl, add the pickled skins into the drum, and start to rotate the drum. The total rotation time was 150 minutes. Use the methyl orange indicator to check that the incision of the skin plate is yellow, and the pH value of the operating solution should be in the range of 4.5-5.0.

[0068] 3. First add tanning agent 1 for initial tanning. The tanning agent ...

Embodiment 3

[0075] Example 3, the comparison of pure vegetable tanned leather, chromium-iron tanned leather and vegetable-chromium-iron combined tanned leather after artificial sweat washing, lye washing, soap washing, organic solvent washing and sun exposure.

[0076] 1. Chrome-iron tanning process:

[0077]Normal temperature water 100% (W / W), use formic acid to adjust pH3.0~3.5, add chromium-iron tanning agent, equivalent to 1.5% (W / W) of dichromium trioxide, and 0.7% of converted ferric oxide (W / W) , NaCl50g / L, turn for 180min, raise alkali 2-4 times, pH4.0, raise temperature 35-40°C, turn for 60min, stop the drum overnight, turn for 30min the next day, measure the shrinkage temperature, put on the horse, and let stand overnight. Washing, neutralization, fatliquoring and drying are carried out according to the conventional process. (150% of the weight of pickled leather is used as the calculation basis for tanning materials.)

[0078] 2. Pure vegetable tanning process:

[0079] The ...

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Abstract

The invention discloses a black leather tanning method which adopts the technical proposal of plant tannin initial tanning and chromium-iron lignosulfonate re-tanning. The dosage of Cr2O3 in chrome tanning agent is 1.5 weight percent to 1.8 weight percent, the dosage of Fe2O3 in the chrome tanning agent is 0.7 weight percent and the dosage of chestnut tannin is 5 weight percent, which are quite an appropriate combination for tanning black leather. The technical proposal obviously reduces the dosage of the chrome tanning agent and even does not use black dyes; the obtained leather is soft to touch and has tender grain surface. The method reduces the environment pollution during leather tanning, simplifies the process, shortens the production cycle and has good economic and social benefit.

Description

technical field [0001] The invention relates to a leather tanning method, in particular to a black leather tanning method, in particular to a method of using plant extracts for pretreatment and then tanning with chromium-iron salt to directly prepare black leather. Background technique [0002] Chromium salt has long been used in the leather manufacturing industry as an excellent tanning agent. On the one hand, there are few chromium resources in my country; on the other hand, under certain conditions, trivalent chromium in leather will be oxidized to hexavalent chromium, and hexavalent chromium is a strong carcinogen. For this reason, the leather industry and environmental protection workers have always attached great importance to the pollution of the environment produced by chromium. In recent years, many scientific researchers have worked hard to develop chrome-free and low-chrome tanning methods for leather, hoping to reduce the environmental hazards of chromium produc...

Claims

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Application Information

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IPC IPC(8): C14C3/02C14C3/10
Inventor 程凤侠
Owner JIAXING UNIV
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