Plant polyphenol reduced chrome-aluminium tanning agent and its prepn

A plant polyphenol and aluminum tanning agent technology, applied in small raw hide/big raw hide/leather/fur treatment, small raw hide/big raw hide/leather skin/fur chemical treatment, tanning treatment, etc., can solve complex process, etc. problem, to achieve the effect of rich source, light color, fine and firm grain

Inactive Publication Date: 2005-03-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese Patent Publication No. CN1059563A also discloses a chromium-aluminum tanning agent prepared by mixing basic chromium sulfate obtained by reducing inorganic or organic reducing agents with aluminum salts, synthetic tannins, etc. It is said that the performance is ideal, but from From the perspective of its preparation, the process is relatively complicated
And there is no report of preparing chromium-aluminum tanning agent by reduction of plant polyphenols

Method used

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  • Plant polyphenol reduced chrome-aluminium tanning agent and its prepn
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  • Plant polyphenol reduced chrome-aluminium tanning agent and its prepn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 16 parts of tannin extract in a rubber bowl, stir and dissolve with 50 parts of water to obtain a glue solution, and set aside; add 55 parts of sodium dichromate and 78 parts of aluminum sulfate into 100 parts of water to dissolve, then slowly add 50 parts of sulfuric acid under stirring , and heated to a slight boil; transfer the solution to a reaction kettle, raise the temperature under normal pressure and maintain the solution temperature at 98°C, and then slowly add the rubber bowl extract glue within 1.5 hours under stirring; continue to be under normal pressure, Keep the slight boiling state and react for 0.9 hours to obtain a liquid product, and the liquid product is spray-dried to obtain a solid powder product.

[0031] The pH value of the tanning agent is 2.27, and the infrared spectrum is between 1405 and 1410cm -1 The absorption peak is 1409.63cm -1 ,See figure 1 .

Embodiment 2

[0033] Weigh 17 parts of bayberry extract, stir and dissolve with 50 parts of water to obtain glue, and set aside; add 50 parts of sodium dichromate and 55 parts of aluminum sulfate into 100 parts of water to dissolve, then slowly add 50 parts of sulfuric acid under stirring, and heated to a slight boil; transfer the solution to a reaction kettle, raise the temperature under normal pressure and keep the solution temperature at 95°C, then slowly add the waxberry extract glue solution within 1.5 hours under stirring; continue to maintain a slight React in boiling state for 1.5 hours to obtain a liquid product, and the liquid product is spray-dried to obtain a solid powder product.

[0034] The pH value of the tanning agent is 2.44, and the infrared spectrum is between 1405 and 1410cm -1 The absorption peak is 1407.5cm -1 ,See figure 2 .

Embodiment 3

[0036] Weigh 14 parts of bayberry extract, stir and dissolve with 50 parts of water to obtain glue, and set aside; add 42 parts of sodium dichromate and 76 parts of aluminum sulfate into 100 parts of water to dissolve, then slowly add 50 parts of sulfuric acid under stirring, and heated to a slight boil; the solution was transferred to a reaction kettle, and the temperature was raised under normal pressure to maintain the solution temperature at 96°C, and then slowly added the bayberry extract glue solution within 1.5 hours under stirring; React in boiling state for 0.8 hours to obtain a liquid product, and the liquid product is spray-dried to obtain a solid powder product.

[0037] The tanning agent has a pH value of 2.01 and an infrared spectrum of 1378-1410cm -1 The absorption peak is 1378.27cm -1 ,See image 3 .

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Abstract

The tanning agent is prepared with red alum, aluminum sulfate, sulfuric acid, tanning extract and water through mixing reaction, and has pH 1.8-3.0 and infrared spectrum with one strong characteristic peak at 1370-1410 / cm. The preparation process includes hydrolysis, reduction coordination reactions under certain conditions. The present invention provides one new use of tanning extract, the preparation process is simple and has mild reaction condition, and the obtained tanning agent has the advantages of all the chrome tanning agent, aluminum tanning agent and plant tanning agent. using the tanning agent can form plump leather with delicate grain surface and excellent chrome absorption and distribution. The tanning agent is favorable to the post-processing of leather and has less environmental pollution.

Description

1. Technical field [0001] The invention belongs to the technical field of leather chemical industry, and in particular relates to a chrome-aluminum tanning agent reduced by plant polyphenols and a preparation method thereof. 2. Background technology [0002] In the process of leather tanning, commonly used tanning agents are: chrome tanning agent, aluminum tanning agent, vegetable tanning agent, synthetic tanning agent, etc. [0003] Chromium tanning agent is a chromium complex strongly masked by sulfate radicals, which has mild tanning properties and better tanning effect. Common chrome tanning agents include KMC and Chromosal (Zhang Mingrang, Chen Wuyong, Tanning Chemistry, China Light Industry Press, 1999). However, the storage of chromium salt is limited, and it cannot be completely absorbed by the leather during the tanning process, and it is difficult to recover chromium in the waste liquid, thus causing serious environmental pollution. Although aluminum tanning agen...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C14C3/08
Inventor陈武勇王应红李立新尹洪雷
OwnerSICHUAN UNIV