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Preparation method of broadly distributed multifunctional polysaccharide-based ligand metal complex tanning agent

A technology of metal complexes and multifunctional groups, which is applied in the field of leather and fur tanning preparations, can solve the problems of reduced oxidation, low content of carboxyl and aldehyde groups, and high reaction temperature, so as to reduce viscosity, surface tension and molecular weight Wide distribution, the effect of improving the tanning effect

Active Publication Date: 2019-04-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason for the low content of carboxyl and aldehyde groups in the products of the prior art is that the hydrogen peroxide oxidation temperature is set too low, both lower than 70°C
Those skilled in the art generally believe that when hydrogen peroxide is used as an oxidizing agent, the reaction temperature should not be too high, because hydrogen peroxide is easy to decompose at high temperature, and the oxidizing property will be reduced

Method used

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  • Preparation method of broadly distributed multifunctional polysaccharide-based ligand metal complex tanning agent
  • Preparation method of broadly distributed multifunctional polysaccharide-based ligand metal complex tanning agent

Examples

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Effect test

Embodiment 1

[0025] In parts by weight, 30 parts of starch, 100 parts of water and 0.015 parts of copper sulfate are placed in a reactor, 18 parts of hydrogen peroxide are added dropwise, and the reaction is carried out by one-step oxidation at a temperature of 120 °C and a pressure of 0.2 MPa for 2 h to obtain broad Distributed liquid multifunctional starch-based ligands; after adjusting the pH of the ligands to 2 with NaOH solution, add 90 parts of zirconium sulfate, and stir for 12 hours to obtain a wide-distributed multifunctional starch-based ligand zirconium complex tanning agent.

[0026] Place the pickled hides obtained by the conventional process in the drum, add 200 wt% pickling solution and 25 wt% complex tanning agent (in terms of solid content) based on the weight of the pickled hides, turn 3 After 2 hours, the alkali was raised with magnesium oxide to pH 3.0, and then the alkali was raised with sodium bicarbonate to pH 3.8, the temperature was adjusted to 40°C, and the process...

Embodiment 2

[0037] In parts by weight, put 5 parts of sodium alginate, 100 parts of water and 0.00025 parts of ferrous sulfate in the reactor, add 2 parts of hydrogen peroxide dropwise, and conduct a one-step oxidation reaction at a temperature of 140°C and a pressure of 0.4 MPa for 0.5 h , to obtain a wide distribution of liquid multifunctional sodium alginate-based ligands; after adjusting the pH of the ligand to 4 with NaOH solution, add 12 parts of aluminum sulfate, and stir for 24 h to obtain a wide distribution of multifunctional sodium alginate-based ligands aluminum Complex tanning agent.

[0038] The pickling fur obtained by the conventional process is placed in a drum, and the pickling solution that is 500 wt% based on the weight of the pickling fur and the complex tanning agent of 26 g / L in terms of the volume of water added (in solids) are added. content meter), after turning for 6 hours, the alkali was extracted with magnesium oxide to pH 3.0, then the alkali was extracted wi...

Embodiment 3

[0041] In parts by weight, 50 parts of sodium carboxymethyl starch, 100 parts of water and 0.05 part of ferric sulfate are placed in the reactor, and 50 parts of hydrogen peroxide are added dropwise, at a temperature of 160 °C and a pressure of 0.6 MPa, the oxidation reaction is carried out in one step 4 h, to obtain a wide distribution of liquid multifunctional sodium carboxymethyl starch ligand; after adjusting the pH of the ligand to 4 with NaOH solution, add 90 parts of titanium sulfate, and directly obtain a wide distribution of multifunctional sodium carboxymethyl starch ligand without stirring Titanium complex tanning agent.

[0042] Place the pickled hides obtained by the conventional process in the drum, add 80 wt% pickling solution and 5 wt% complex tanning agent (in terms of solid content) based on the weight of the pickled hides, turn 2 After 2 hours, the alkali was extracted with magnesium oxide to pH 3.0, and then the alkali was extracted with sodium bicarbonate ...

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Abstract

The invention discloses a preparation method of a widely distributed multifunctional group polysaccharide-based ligand and metal complex tanning agent. The preparation method is characterized in that polysaccharide is oxidized through hydrogen peroxide under high temperature and high pressure, constituents are completely reserved, and widely distributed polysaccharide-based ligand is prepared; and then chromium-free metal salt is added into the polysaccharide-based ligand, and the complex tanning agent is obtained through coordination reaction. The complex tanning agent can be evenly distributed in hierarchical structures of leather collagen, and through reaction between the leather collagen and a coordination bond as well as a covalent bond, leather / fur can have the excellent hydrothermal stability and sensory property.

Description

technical field [0001] The invention belongs to the preparation method of leather and fur tanning agent, in particular to a preparation method of wide-distributed multifunctional group polysaccharide-based ligand metal complex tanning agent. Background technique [0002] Chrome tanning still dominates the leather industry. However, the discharge of chromium-containing wastewater and the treatment of chromium-containing solid waste have been severely restricted. Therefore, developing chrome-free tanning agents and implementing chrome-free tanning methods to eliminate chrome pollution from the source is an urgent need for sustainable development of the leather industry. Aluminum salts, zirconium salts, titanium salts and other non-chrome metal tanning agents have a long history in the leather industry. Compared with organic tanning agents, non-chrome metal tanning agents have the closest tanning properties to chrome tanning agents, and have a good match with existing tanning...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08C08B31/18C08B37/04
CPCC08B31/185C08B37/0084C14C3/08
Inventor 王亚楠余跃石碧周建飞曾运航
Owner SICHUAN UNIV
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