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A kind of nano-micellar tanning agent and its preparation method and application in tanning leather

A nano-micelle and tanning agent technology, applied to clean tanned leather and traditional tanned leather, the field of nano-micelle tanning agent loaded with metal ions and its preparation, can solve the problem of restricting the sustainable development of the leather industry, affecting the The quality of finished leather, the content of tanning waste liquid, etc., to avoid the excessive content of hexavalent chromium in finished leather, good stability and efficient utilization

Active Publication Date: 2019-06-21
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the metal tanning agent is directly used for tanning without pickling, it is very easy to cause the surface of the leather to be over-tanned, which will seriously affect the quality of the finished leather
However, in the pickling process, in order to prevent skin acid swelling, 8% NaCl needs to be added, resulting in a large amount of neutral salt in the tanning waste liquid, which has become another important source of pollution in the traditional tanning process
[0004] In summary, chrome pollution and neutral salt pollution in the traditional chrome tanning process have seriously restricted the sustainable development of the leather industry

Method used

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  • A kind of nano-micellar tanning agent and its preparation method and application in tanning leather
  • A kind of nano-micellar tanning agent and its preparation method and application in tanning leather
  • A kind of nano-micellar tanning agent and its preparation method and application in tanning leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A preparation method of chromium-loaded nano micellar tanning agent is synthesized according to the following steps:

[0075] Step 1: Synthesis of Copolymer

[0076] (1) Synthesis of PEG-co-AA

[0077] A) Take methoxypolyethylene glycol acrylate monomer and acrylic acid monomer and dissolve them in ethanol at a molar ratio of 1:0.5, and add azobisisobutyronitrile with 0.5% of the total mass of the monomers into the above solution; After evacuating the oxygen with a water pump for 20 minutes, react at 70°C for 24 hours;

[0078] B) After the reaction, the reaction solution was concentrated by rotary evaporation, then precipitated in glacial ether for 2-3 times, and the PEG-co-AA binary copolymer was obtained after removing the ether;

[0079] (2) Synthesis of PEG-co-AA-co-GMA

[0080] A) Take methoxypolyethylene glycol acrylate monomer, acrylic acid monomer, glycidyl methacrylate, the monomer molar ratio is 1:1:0.5, dissolve the monomer in ethanol, weigh the monomer ...

Embodiment 2

[0088] Prepare zirconium-loaded nanomicelle type I, type II and type III tanning agents according to the method of Example 1, wherein the molar ratio of the two monomers of PEG-co-AA is 1:5, and PEG-co-AA-co-GMA The molar ratio of the three monomers of PEG-co-AA-co-SSEM is 1:0.5:2, the amount of initiator azobisisobutyronitrile in the polymerization reaction is 1.5% of the total mass of the monomers, and the inorganic metal ion for Zr 4+ ion, Zr 4+ The molar ratio of ions to carboxyl groups of the copolymer is 3:1, and finally, type I, type II and type III tanning agents of zirconium-loaded nanomicelles are obtained.

Embodiment 3

[0090] Prepare aluminum-loaded nanomicelle type I, type II and type III tanning agents according to the method of Example 1, wherein the molar ratio of the two monomers of PEG-co-AA is 1:2, and PEG-co-AA-co-GMA The molar ratio of the three monomers of PEG-co-AA-co-SSEM is 1:5:0.2, the amount of initiator azobisisobutyronitrile in the polymerization reaction is 1.2% of the total mass of the monomer, and the inorganic metal ion is al 3+ ion, Al 3+ The molar ratio of ions to carboxyl groups of the copolymer is 2:1, and the aluminum-loaded nanomicelle type I, type II and type III tanning agents are finally obtained.

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Abstract

The invention provides a nano micellar tanning agent, its preparation method and its application in leather tanning. Nano micellar tanning agent of the present invention is by polyacrylate methoxypolyethylene glycol ester-acrylic acid multiple copolymer and inorganic metal ion commonly used in tanning leather, by self-assembly in water, take copolymer as outer shell, metal ion Core-shell nanomicelle structure as the inner core. The core-shell structure can effectively protect trivalent chromium and avoid its transformation into hexavalent chromium, and the nano-micelle tanning agent can not only be applied to non-pickling tanning, salt-free pickling tanning and traditional pickling tanning, but also break through tanning Combined with the limitation of chemical balance, metal ions can coordinate with skin collagen carboxyl groups and polymer carboxyl groups to achieve uniform tanning while improving the absorption and utilization of metal ions, reducing heavy metal emission pollution and neutral salt pollution. The invention can also improve the fullness and physical and mechanical properties of the finished leather, achieve a similar retanning effect, and realize the integration of main retanning in the tanning process.

Description

technical field [0001] The invention belongs to the technical field of preparation of leather tanning agent and its tanning application technology, and in particular relates to a metal ion-loaded nano-micelle tanning agent and its preparation method, and its application in cleaning tanning and traditional tanning. Background technique [0002] In the traditional leather industry, commonly used metal tanning agents include chrome tanning agents, aluminum tanning agents, zirconium tanning agents, and iron tanning agents. The tanning mechanism of these metal tanning agents is that their metal ions form a cross-linked tanning effect through coordination and complexation with carboxyl groups on leather collagen fibers. Especially chrome tanning agent is currently recognized as the tanning agent with the best comprehensive performance, and chrome tanned leather also accounts for more than 85% of all leather products because of its high moisture and heat resistance stability and wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/22C14C11/00
CPCC14C3/22C14C11/003
Inventor 刘公岩李开军于锐权
Owner SICHUAN UNIV