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A kind of preparation method of preparing chrome tanning liquor with chitosan

A technology of chitosan and chrome tanning, which is applied in the field of preparation of chrome tanning liquor prepared with chitosan, can solve problems such as adverse environmental effects and limited reserves, and achieve excellent tanning performance, reduced use cost, and good comprehensive performance Effect

Active Publication Date: 2017-03-15
阳信瑞丰集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, red vanadium (potassium dichromate, sodium dichromate), the raw material for the production of chrome tanning agents, not only has limited reserves on the earth
Moreover, the trivalent chromium in the waste chromium solution that has not been completely absorbed by the skin is easily transformed into highly toxic hexavalent chromium under certain conditions, which has adverse effects on the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Prepare 0.05g / ml acetic acid solution with glacial acetic acid (≥99.5%).

[0024] (2) Weighing 20 parts of chitosan with a mass concentration of 100% and dissolving it with 20 parts of the acid solution obtained in step (1).

[0025] (3) Dissolve 100 parts of potassium dichromate with a mass concentration of 100% in water with a mass of 400 parts and a temperature of 75°C to obtain a potassium dichromate solution, and then add dichromic acid under stirring Add (133.3-B) parts of concentrated sulfuric acid with a mass concentration of 100% to the potassium solution container.

[0026] (4) Slowly add the red vanadium solution and acid solution into the reaction vessel under stirring

[0027] Dissolve the chitosan solution with organic acid, keep the reaction complete, the solution is blue-green, check the color and alkalinity of the tanning solution, and adjust the reaction solution until the reaction is complete and meets the requirements.

[0028] (5) Standing and...

Embodiment 2

[0031] (1) Prepare 0.05g / ml acetic acid solution with glacial acetic acid (≥99.5%).

[0032] (2) Weigh 30 parts of chitosan with a mass concentration of 100% and dissolve it with 25 parts of the acid solution obtained in step (1).

[0033] (3) Dissolve 100 parts of potassium dichromate with a mass concentration of 100% in water with a mass of 500 parts and a temperature of 75°C to obtain a potassium dichromate solution, and then add dichromic acid under stirring Add (133.3-B) parts of concentrated sulfuric acid with a mass concentration of 100% to the potassium solution container.

[0034] (4) Slowly add the red vanadium solution and acid solution into the reaction vessel under stirring

[0035] Dissolve the chitosan solution with organic acid, keep the reaction complete, the solution is blue-green, check the color and alkalinity of the tanning solution, and adjust the reaction solution until the reaction is complete and meets the requirements.

[0036] (5) Standing and agin...

Embodiment 3

[0039] (1) Prepare 0.05g / ml acetic acid solution with glacial acetic acid (≥99.5%).

[0040] (2) Weigh 35 parts of chitosan with a mass concentration of 100% and dissolve it with 30 parts of the acid solution obtained in step (1).

[0041] (3) Dissolve 100 parts of potassium dichromate with a mass concentration of 100% in water with a mass of 600 parts and a temperature of 75°C to obtain a potassium dichromate solution, and then pour it into a solution filled with dichromic acid under stirring Add (133.3-B) parts of concentrated sulfuric acid with a mass concentration of 100% to the potassium solution container.

[0042] (4) Slowly add the red vanadium solution and acid solution into the reaction vessel under stirring

[0043] Dissolve the chitosan solution with organic acid, keep the reaction complete, the solution is blue-green, check the color and alkalinity of the tanning solution, and adjust the reaction solution until the reaction is complete and meets the requirements....

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PUM

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Abstract

The invention relates to a method for preparing chrome tanning liquor with chitosan. The method comprises the steps of preparing an acid solution with the concentration of 0.03-0.06 g / ml with organic acid; weighing 20-35 mass parts of the chitosan and dissolving the chitosan in 20-35 mass parts of the organic acid solution; dissolving 100 mass parts of dichromate in 400-600 mass parts of water the temperature of which is 65-85 DEG C to obtain a dichromate solution, and then adding acid to a container containing the dichromate solution with stirring; and slowly adding the chitosan solution dissolved in the organic acid with stirring till the reaction ends when the solution becomes blue-green, examining the color and alkalinity of tanning liquor, regulating the reaction solution till the reaction ends and requirements are met, and finally conducting standing. The chitosan can replace glucose to prepare the chrome tanning liquor, so that using cost is reduced. The obtained chrome tanning liquor has a masking characteristic and is excellent in overall performance including tanning performance, abrasion resistance and tensile strength.

Description

[0001] (1) Technical field [0002] The invention belongs to the field of leather chemical industry, and in particular relates to a preparation method for preparing chrome tanning liquor with chitosan. [0003] (2) Background technology [0004] Tanning is a process of qualitative change that converts raw hide into leather, and the chemical material that can convert hide into leather is called a tanning agent. The tanning agents that can be used in the leather production process include inorganic tanning agents and organic tanning agents. The chrome tanning agent in the inorganic tanning agent in the tanning agent has strong moisture and heat resistance stability, storage resistance, soft and plump hand feeling, excellent dyeing performance and other properties, and it still has an irreplaceable role so far. [0005] The common valence states of chromium are: 0, +3, +6, among which only trivalent chromium has tanning properties, and chromium in nature is mainly in the form of h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08
Inventor 孙友昌王立新樊成志
Owner 阳信瑞丰集团有限公司