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Plant biomass-metal in-situ leather combining-tanning method

A plant biomass combined tanning technology, which is applied in the field of plant biomass-metal in-situ combined tanning of leather, can solve the problems of molecular size collagen binding force affecting penetration, difficult mechanism and other problems, and achieves stable framework structure, simple synthesis technology, The effect of raising the shrinkage temperature of finished leather

Inactive Publication Date: 2010-05-12
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The order and dosage of tanning agents in the tanning process will affect the synergistic effect. Therefore, it is difficult to study the mechanism of these multi-tanning agent tanning methods in the collagen inner circle. At the same time, the molecular size of the tanning agent and the two tanning agents The difference in the binding force of the agent to collagen will also obviously affect its penetration and other issues.

Method used

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  • Plant biomass-metal in-situ leather combining-tanning method
  • Plant biomass-metal in-situ leather combining-tanning method
  • Plant biomass-metal in-situ leather combining-tanning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0022] 50.0 g of the original polysaccharide substance (starch, cellulose, sucrose, etc.) is formulated into a 40% paste liquid, and the pH of the solution is adjusted to 3.0 with 3% sulfuric acid, and 1.5 g of cerium ammonium nitrate is added, and the mixture is stirred at 48° C. Reflux for 4 hours, the obtained precipitate was separated and purified by centrifugation, dried in an oven at 45°C, and then the plant biomass was mixed with ferrous chloride (FeCl 2 ) in a molar ratio of 1:1 to 2:1 to prepare solutions with a molar concentration of 0.05 to 0.20 mol / L, add them to a reactor with a stirrer, and mix them thoroughly under stirring. The fraction is 3% HCl solution to adjust the pH of the reaction solution to 2.0-4.0, react at room temperature for 2-6 hours, and centrifuge and purify the generated precipitate, dry it at a temperature of 40-60°C and a vacuum of 0.04MPa, and then place it in an oven at a temperature of 50°C drying.

Embodiment approach 2

[0024] 50.0 g of the original polysaccharide substance (starch, cellulose, sucrose, etc.) is formulated into a 40% paste liquid, and the pH of the solution is adjusted to 3.0 with 3% sulfuric acid, and 1.5 g of cerium ammonium nitrate is added, and the mixture is stirred at 48° C. Reflux for 4 hours, the obtained precipitate was separated and purified by centrifugation, dried in an oven at 45°C, and then the plant biomass was mixed with chromium chloride (CrCl 3 ) in a molar ratio of 1:1 to 2:1 to prepare solutions with a molar concentration of 0.05 to 0.20 mol / L, add them to a reactor with a stirrer, and mix them thoroughly under stirring. The fraction is 3% HCl solution to adjust the pH of the reaction solution to 2.0-4.0, react at room temperature for 2-6 hours, and centrifuge and purify the generated precipitate, dry it at a temperature of 40-60°C and a vacuum of 0.04MPa, and then place it in an oven at a temperature of 50°C drying.

Embodiment approach 3

[0026] 50.0 g of the original polysaccharide substance (starch, cellulose, sucrose, etc.) is formulated into a 40% paste liquid, and the pH of the solution is adjusted to 3.0 with 3% sulfuric acid, and 1.5 g of cerium ammonium nitrate is added, and the mixture is stirred at 48° C. Reflux for 4 hours, the obtained precipitate was separated and purified by centrifugation, dried in an oven at 45°C, and then the plant biomass was mixed with aluminum chloride (AlCl 3 ) in a molar ratio of 1:1 to 2:1 to prepare solutions with a molar concentration of 0.05 to 0.20 mol / L, add them to a reactor with a stirrer, and mix them thoroughly under stirring. The fraction is 3% HCl solution to adjust the pH of the reaction solution to 2.0-4.0, react at room temperature for 2-6 hours, and centrifuge and purify the generated precipitate, dry it at a temperature of 40-60°C and a vacuum of 0.04MPa, and then place it in an oven at a temperature of 50°C drying.

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Abstract

The invention discloses a plant biomass-metal in-situ leather combining-tanning method, which is characterized in that plant biomass and metal are prepared into solutions in a molar concentration between 0.05 and 0.20 mol / L in a mol ratio between 1:1 and 2:1 respectively; after the solutions are mixed well in a stirring state, the pH of reaction solution is regulated to between 2.0 and 4.0 by use of an HCl solution with a mass fraction of 3 percent; reflux reaction is performed for 2 to 6 hours at room temperature; generated precipitate is centrifuged, separated and purified; the obtained product is dried at 40 to 60 DEG C in a vacuum degree between 0.02 and 0.06 MPa and then is dried in an oven at 45 to 60 DEG C; and raw pig / cow / sheep skin is tanned by an in-situ combining-tanning method so as to obtain finished leather which is at a shrinkage temperature between 85 and 110 DEG C and is plump and elastic in hand feel. The method can have conventional chromium salt partially replaced to reduce Cr pollution, and creates a novel way for utilizing materials with low tanning property to manufacture leather with high wet-thermal stability.

Description

technical field [0001] The invention relates to a method for combining plant biomass and metal in situ for tanning leather, and belongs to the field of organic-inorganic amphoteric combined tanning. Background technique [0002] The existing tanning theory and practice in the field of tanning have shown that the combined use of multiple tanning agents with relatively weak astringent properties can significantly improve the heat-resistant stability of animal hide collagen during tanning. This phenomenon is called tanning agent tanning. Synergetic Effect (Synergetic Effect). As the most protein in animals, the low thermal stability of collagen greatly affects its usefulness. Tannery workers have also been seeking a multi-tanning agent tanning method to increase the thermal stability of collagen, that is, combined tanning ( Combination Tannage). The order and dosage of tanning agents in the tanning process will affect the synergistic effect. Therefore, it is difficult to stud...

Claims

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Application Information

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IPC IPC(8): C14C3/22
Inventor 王亚娟邵双喜单志华蒋岚
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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