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Composition of tanning agent containing modified tara mimosa extract, and bating method without chrome

A technology of Tara extract and chrome-free tanning, which is applied in small raw hide/big raw hide/leather/fur treatment, tanning treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, etc., and can solve problems that are not suitable Sofa leather, high elongation rate of finished leather, high price of tanning agent, etc., to achieve the effect of lightening color, light color and good fullness

Inactive Publication Date: 2007-12-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Organic phosphorus salt tanning agents also have their disadvantages: on the one hand, the price of the tanning agent is relatively high, on the other hand, the elongation rate of the finished leather is relatively large, and it is not suitable for making sofa leather

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Pickling cowhide (section thickness 1.8mm), 100kg in the pickling solution, the liquid ratio is 50kg, add 3kg of basic aluminum chloride, turn for 2 hours, adjust the pH to 5.0-5.2 with sodium thiosulfate or baking soda, Add 10kg of Tara extract, rotate for 6 hours (speed 4rpm), add 10kg of Tara extract, rotate for 8 hours, stop the drum overnight, rotate for 1 hour the next day, take out the drum and let it stand for 2 days.

[0042] Rinse: 150ωt% water, 0.8ωt% sulfuric acid (1:20 times dilution), turn for 40 minutes (8~10rpm).

[0043] Fatliquoring: add mixed sulfated castor oil 3ωt% and TRUPON SR 4ωt%, turn on for 90-120 minutes, add 0.5ωt% rare earth salt, turn on for 30 minutes.

[0044] Washing: 200% water, turn for 30 minutes.

[0045] Dry and finish.

[0046] The grain surface of the finished leather is fine and firm, with good fullness and softness, and its Ts can reach above 90°C.

Embodiment 2

[0048] Pickling pigskin (thickness of split layer: 1.8-2.0mm), 100kg in pickling solution, deacidification with sodium thiosulfate, adjust pH to 5.2-5.4, add 3ωt% NF syntan, turn for 1 hour, add tower Pull 10kg of tannin extract, turn it for 6 hours (the speed is 4rpm), add 14kg of Tara tannin extract, turn it for 6-8 hours, add 1kg of titanium sulfate tanning agent, turn it for 2 hours, take it out of the drum and let it stand for more than 2 days

[0049] Fatliquor: 150kg of water, 35°C, CNS synthetic fatliquor 4ωt%, L-3 fatliquor 3ωt%.

[0050] Fixation: 1kg of formic acid, after dilution, add in three times, the total time is 60 minutes.

[0051] Drying and finishing.

[0052] The finished leather is tight, plump and light in color, with a Ts of 89°C.

Embodiment 3

[0054] 100kg of softened goatskin, without pickling, pH 6.5-8.0, liquid ratio 100kg, add 10kg of zinc sulfate, turn for 1-2 hours, add 15kg of Tara tannin extract, turn for 5-10 hours, take it out of the drum and let it stand .

[0055] Rinse: adjust the pH to about 4.0 with sulfuric acid 1ωt%.

[0056] Fatliquoring: use CNS synthetic fatliquoring agent 1ωt%, OS fish oil fatliquoring agent 3ωt%, TRUPON EIR 3ωt% fatliquoring, finishing.

[0057] The finished leather is soft and plump, with a shrinkage temperature of 80-85°C.

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Abstract

A tanning agent containing modified Tara tannin extract contains proportionally modified Tara tannin extract, non-Cr metal salt and organic phosphorus salt. Its tanning method features that the bare leather must be immersed in acid before tanned.

Description

1. Technical field [0001] The invention relates to a tanning agent containing modified tara extract and a chrome-free tanning method thereof, belonging to the application of forestry products in leather-making engineering. 2. Background technology [0002] Since it was discovered that chromium salt has excellent tanning performance, chromium salt tanned leather has high moisture and heat resistance stability, good softness and fullness, and good water resistance, chemical resistance and microbial action performance, and has been Occupy a dominant position, so far, also fail to find the effective substitute product of chrome tanning agent. However, the harm of chromium to the environment, humans and animals has already attracted people's great attention, such as the chromium content in tannery wastewater and hexavalent chromium in finished leather. On the one hand, the traditional chrome tanning method has a low chromium absorption utilization rate, generally 60% to 80%, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08
Inventor 张宗才戴红吴九皋刘义雄
Owner SICHUAN UNIV
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