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Light-color multi-carboxyl oxidized polysaccharide tanning agent as well as preparation method and application thereof

An oxidized polysaccharide tanning agent and a technology for oxidized polysaccharide, applied in the field of leather and fur tanning agents, can solve the problems of affecting the color and appearance of leather or fur, dark product color, restricting the application of chrome-free leather, etc. The effect of chromaticity, excellent coordination ability

Active Publication Date: 2021-05-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this method is that the product is darker in color, and its use in tanning will affect the color and appearance of leather or fur, which limits its application in the manufacture of chrome-free leather
Chinese patent CN107119154B "Preparation method of broadly distributed polysaccharide-based ligand metal complex tanning agent" discloses a high temperature (120-160 ° C), high pressure (0.2-0.6 MPa) and high hydrogen peroxide dosage (40-100 wt %) catalytic oxidation to prepare oxidized polysaccharides, the problem is that high temperature and high pressure conditions are more likely to promote the formation of colored substances

Method used

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  • Light-color multi-carboxyl oxidized polysaccharide tanning agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of light-colored polycarboxylated starch tanning agent:

[0038]In parts by weight, put 40 parts of starch, 100 parts of water, 0.04 parts of ferrous sulfate and 3.2 parts of tetrahydrofuran in a reactor, add 20 parts of hydrogen peroxide dropwise, and oxidize at a temperature of 70 ° C for 4 h to obtain oxidized starch solution; add 6 parts of sodium chloride to the above solution, stir evenly and let it stand for 30 min, fully separate the aqueous phase from the organic phase, discard the organic phase containing colored substances, and finally obtain the aqueous phase, that is, light-colored polycarboxylated starch Tanning agent.

[0039] In this step, the carboxyl content, weight-average molecular weight and chromaticity of the oxidized starch tanning agent were measured, and the results are shown in Table 1.

[0040] Application of light-colored polycarboxylated starch oxidized starch tanning agent in leather tanning:

[0041] The pickled hides obtain...

Embodiment 2

[0055] Preparation of light-colored polycarboxylated dextrin tanning agent:

[0056] In parts by weight, 20 parts of dextrin, 100 parts of water, 0.02 parts of ferric sulfate and 1.6 parts of ethyl acetate were placed in a reactor, 16 parts of hydrogen peroxide were added dropwise, and oxidized at a temperature of 70°C for 0.5 h to obtain Oxidized dextrin solution: Stir the oxidized dextrin solution evenly and let it stand for 30 minutes. After the aqueous phase and the organic phase are fully separated, discard the organic phase containing colored substances, and finally obtain the aqueous phase, that is, light-colored polycarboxy oxidized dextrin tanned agent.

[0057] The carboxyl content of the oxidized dextrin tanning agent in this example is 5.7 mmol / g; the weight-average relative molecular mass is 1495 g / mol; the chroma is 45.

[0058] Application of light-colored polycarboxy oxidized dextrin tanning agent in leather tanning:

[0059] Put the pickled hides obtained by...

Embodiment 3

[0061] Preparation of light-colored polycarboxylated cellulose oxidized tanning agent:

[0062] In parts by weight, put 60 parts of cellulose, 100 parts of water, 0.06 parts of copper sulfate and 4.8 parts of tetrahydrofuran in a reactor, drop 18 parts of hydrogen peroxide, and oxidize at a temperature of 70 ° C for 2 h to obtain oxidized fibers plain solution; add 18 parts of potassium chloride to the above solution, stir evenly and let it stand for 30 min, fully separate the aqueous phase from the organic phase, discard the organic phase containing colored substances, and finally obtain the aqueous phase, that is, the light-colored polycarboxylated Cellulose tanning agent.

[0063] The carboxyl content of the oxidized cellulose tanning agent in this example is 11.8 mmol / g; the weight-average molecular weight is 1115 g / mol; the chroma is 10.

[0064] Application of light-colored polycarboxylated oxidized cellulose tanning agent in leather tanning:

[0065] The pickled hides...

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Abstract

The invention belongs to the technical field of leather and fur tanning agents, and discloses a light-color multi-carboxyl oxidized polysaccharide tanning agent and a preparation method and application thereof. According to the preparation method of the light-color oxidized polysaccharide tanning agent, a two-phase solution system is adopted, compared with an existing oxidized polysaccharide tanning agent preparation technology, colored substances generated in the oxidation process can be efficiently extracted and removed, a polymerization reaction between the colored substances and oxidized polysaccharide is blocked in time, and therefore the effect of remarkably reducing the chroma of an oxidation product is achieved. Meanwhile, a catalytic oxidation system composed of a catalyst and hydrogen peroxide can ensure that the oxidized polysaccharide has enough carboxyl content and has excellent coordination capacity with non-chromium metal salt, so that the oxidized polysaccharide tanning agent has an excellent application effect in leather or fur tanning.

Description

technical field [0001] The invention relates to the technical field of leather and fur tanning agents, in particular to a light-colored polycarboxylated polysaccharide tanning agent and its preparation method and application. Background technique [0002] Polysaccharides are macromolecular compounds formed by connecting more than ten monosaccharides through glycosidic bonds. They have the advantages of wide sources, renewable, safe, non-toxic, and low cost. They are ideal raw materials for the preparation of ecological tanning agents. Under the strong oxidation of oxidizing agents such as hydrogen peroxide, the hydroxyl groups in the sugar unit structure will be oxidized to carboxyl groups, and the glycosidic bonds will be broken. Therefore, the deeply oxidative degradation products of polysaccharides can be paired with non-chromium metal salts for leather or fur tanning. [0003] Literature (Yu Yue, Wang Yanan, Ding Wei, et al. Effects of catalysts on the structure and tan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/08
CPCC14C3/08
Inventor 余跃王亚楠石碧郭雪茹周建飞曾运航张文华曹明蓉
Owner SICHUAN UNIV
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