A kind of polysaccharide-based hydrotalcite nanocomposite tanning agent and its preparation method and application

A technology of compound tanning agent and hydrotalcite, applied in the field of leather tanning, can solve the problems of uneven distribution, low tanning efficiency, low absorption rate of single metal tanning agent, etc., and achieve the effect of slowing down the binding rate

Active Publication Date: 2022-07-29
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a polysaccharide-based hydrotalcite nano-composite tanning agent and its preparation method and application for the problems of low tanning efficiency of the existing single polysaccharide tanning agent and low absorption rate and uneven distribution of the single metal tanning agent

Method used

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  • A kind of polysaccharide-based hydrotalcite nanocomposite tanning agent and its preparation method and application

Examples

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Embodiment 1

[0035] A preparation method of a starch-based hydrotalcite nanocomposite tanning agent, comprising the following steps:

[0036] S1: in parts by mass, mix 50 parts of starch and 100 parts of water uniformly to obtain an initial polysaccharide solution; add 0.05 part of ferrous sulfate to the initial polysaccharide solution under the condition that the water bath temperature is 70 degrees Celsius, and add 100 parts of 30% hydrogen peroxide after stirring The solution is subjected to oxidation reaction for 3 hours to obtain a pretreated polysaccharide polymer, and the pH value of the pretreated polysaccharide polymer is adjusted to 2 with a sodium hydroxide solution to obtain a polysaccharide polymer;

[0037] S2: Stir 80 parts of magnesium nitrate, 40 parts of aluminum nitrate, 40 parts of zirconium nitrate and 500 parts of deionized water to obtain a mixed salt solution, then drop the mixed salt solution into 300 parts of 2M anhydrous sodium carbonate solution to obtain a mixed...

Embodiment 2

[0040] A preparation method of a chitosan-based hydrotalcite nanocomposite tanning agent, comprising the following steps:

[0041] S1: in parts by mass, mix 70 parts of chitosan and 200 parts of water uniformly to obtain an initial polysaccharide solution; add 0.05 part of ferrous sulfate to the initial polysaccharide solution under the condition that the water bath temperature is 80°C, and add 200 parts of 30 % hydrogen peroxide solution is oxidized for 5 hours to obtain a pretreated polysaccharide polymer, and the pH value of the pretreated polysaccharide polymer is adjusted to 4 with sodium hydroxide solution to obtain a polysaccharide polymer;

[0042] S2: Stir 90 parts of magnesium chloride, 50 parts of aluminum chloride, 30 parts of tetravalent zirconium chloride and 500 parts of deionized water to obtain a mixed salt solution, and then drop the mixed salt solution into 400 parts of 1M anhydrous sodium carbonate solution, A mixed solution was obtained, the mixed solution...

Embodiment 3

[0045] A preparation method of a sodium alginate-based hydrotalcite nanocomposite tanning agent, comprising the following steps:

[0046] S1: in parts by mass, mix 100 parts of sodium alginate and 600 parts of water evenly to obtain an initial polysaccharide solution; add 0.05 parts of copper sulfate and 2 parts of ferrous sulfate to the initial polysaccharide solution under the condition that the water bath temperature is 75°C, and stir Then add 250 parts of 30% hydrogen peroxide solution to carry out oxidation reaction for 6 hours to obtain a pretreated polysaccharide polymer, and adjust the pH value of the pretreated polysaccharide polymer to 3 with sodium hydroxide solution to obtain a polysaccharide polymer;

[0047] S2: stir 100 parts of magnesium sulfate, 40 parts of aluminum sulfate, 50 parts of zirconium sulfate and 500 parts of deionized water to obtain a mixed salt solution, and then drop the mixed salt solution into 600 parts of 1.5M sodium carbonate aqueous solutio...

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Abstract

The invention discloses a polysaccharide-based hydrotalcite nanocomposite tanning agent and a preparation method and application thereof, belonging to the technical field of leather tanning, and is characterized in that a magnesium-aluminum-zirconium ternary hydrotalcite nanomaterial is prepared by a coprecipitation method under alkaline conditions , introduced into the polysaccharide-based material, and the polysaccharide-based hydrotalcite nanocomposite tanning agent was obtained after the coordination reaction. The tanning agent has a suitable size, can obtain good penetration in the skin collagen, and has a variety of tanning metal elements, which improves the shortcoming of insufficient tanning ability of a single polysaccharide, and achieves a good tanning effect. The tanning agent can be used in the main tanning or retanning process, suitable for the production of various types of leather, and can also be used for the functional modification of collagen and other proteins.

Description

technical field [0001] The invention belongs to the technical field of leather tanning, and in particular relates to a polysaccharide-based hydrotalcite nanocomposite tanning agent and a preparation method and application thereof. Background technique [0002] As a kind of beautiful, fashionable and high-value products, such as leather clothing, leather shoes, leather bags, etc., leather products have become necessities in people's daily life. The leather processing process is the process of turning raw hides into leather, mainly to effectively cross-link and disperse raw hide collagen, including pre-tanning preparation, tanning, finishing and other processes, of which tanning is the top priority. At present, chrome tanning agents still occupy a dominant position in leather tanning due to their advantages of good permeability, stable bonding and strong positive electricity. However, chrome tanning technology will bring a lot of solid waste and chrome wastewater and other po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/02
CPCC14C3/02
Inventor 马建中沈一鸣范倩倩
Owner SHAANXI UNIV OF SCI & TECH
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