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Nano tanning agent based on structural memory effect, preparation method and applications thereof

A structure-memory and nano-technology, applied in the field of leather tanning agents, can solve the environmental hazards of chromium-containing wastes, waste water pollution and other problems, and achieve the effects of enhancing adsorption performance, improving uniform dispersion, and increasing shrinkage temperature

Active Publication Date: 2020-04-14
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chrome tanning agent has been irreplaceable due to its excellent wet heat stability and process technology, but the pollution of wastewater and the harm to the environment caused by chromium-containing waste cannot be ignored

Method used

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  • Nano tanning agent based on structural memory effect, preparation method and applications thereof
  • Nano tanning agent based on structural memory effect, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Preparation of nano-tanning agent: according to the molar ratio of magnesium and aluminum elements of 2:1, magnesium nitrate and aluminum nitrate were respectively weighed and dissolved in 50 ml of water to prepare metal salt solution A, and sodium carbonate was dissolved in 100 ml of water to prepare 0.875 mol / L sodium carbonate solution B; then add solution A dropwise into solution B, adjust the pH value to 12 with 2 mol / L sodium hydroxide solution at the same time, nucleate and crystallize at a temperature of 75°C for 10 hours, centrifuge, freeze-dry, Afterwards, the obtained product was calcined at 450° C. for 4 hours to obtain a nano-tanning agent.

[0022] (2) Tanning: at room temperature, add water and softened skin with a mass ratio of 1:1 into the drum, add 8% sodium chloride with tare weight, and turn for 30 minutes; add nano-tanning agent with 3% tare weight , adjust the pH value of the bath solution to 3.0 with 2% formic acid solution, and then rotate f...

Embodiment 2

[0024] (1) Preparation of nano-tanning agent: according to the molar ratio of magnesium and aluminum elements of 2:1, magnesium nitrate and aluminum nitrate were respectively weighed and dissolved in 50 ml of water to prepare metal salt solution A, and sodium carbonate was dissolved in 100 ml of water to prepare 0.875 mol / L sodium carbonate solution B; then add solution A dropwise into solution B, adjust the pH value to 12 with 2 mol / L sodium hydroxide solution at the same time, nucleate and crystallize at a temperature of 75°C for 10 hours, centrifuge, freeze-dry, Afterwards, the obtained product was calcined at 450° C. for 4 hours to obtain a nano-tanning agent.

[0025] (2) Tanning: at room temperature, add water and softened skin with a mass ratio of 1:1 into the drum, add 8% sodium chloride with tare weight, and turn for 30 minutes; add nano-tanning agent with 3% tare weight , adjust the pH value of the bath solution to 3.0 with 2% formic acid solution, and then rotate f...

Embodiment 3

[0027] (1) Preparation of nano-tanning agent: according to the molar ratio of magnesium and aluminum elements of 2:1, magnesium nitrate and aluminum nitrate were respectively weighed and dissolved in 50 ml of water to prepare metal salt solution A, and sodium carbonate was dissolved in 100 ml of water to prepare 0.875 mol / L sodium carbonate solution B; then add solution A dropwise into solution B, adjust the pH value to 12 with 2 mol / L sodium hydroxide solution at the same time, nucleate and crystallize at a temperature of 75°C for 10 hours, centrifuge, freeze-dry, Afterwards, the obtained product was calcined at 450° C. for 4 hours to obtain a nano-tanning agent.

[0028] (2) Tanning: at room temperature, add water and softened skin with a mass ratio of 1:1 into the drum, add 8% sodium chloride with tare weight, and turn for 30 minutes; add nano-tanning agent with 5% tare weight , adjust the pH value of the bath solution to 3.0 with 2% formic acid solution, and then rotate f...

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Abstract

The invention discloses a nano tanning agent based on a structure memory effect, a preparation method and applications thereof. A purpose of the invention is to increase the specific surface area of atanning agent and enhance the adsorption performance. According to the technical scheme, the preparation method of the nano tanning agent based on the structure memory effect comprises: respectivelyweighing magnesium nitrate and aluminum nitrate, and dissolving in water to prepare a metal salt solution A; dissolving sodium carbonate in water to prepare a sodium carbonate solution B; and adding the solution A into the solution B in a dropwise manner, regulating the pH value to 10-12 by using a sodium hydroxide solution, carrying out nucleating crystallizing for 10 hours at a temperature of 75DEG C, centrifuging, freeze-drying, and calcining the obtained product for 2-4 hours at a temperature of 350-450 DEG C to obtain the nano tanning agent. According to the invention, the prepared nanotanning agent has a unique structural memory effect; and in a tanning process, the nano tanning agent is assembled with leather collagen fibers to form an organic / inorganic nano hybrid material by adjusting the external environment, so that the shrinkage temperature of crust leather is increased.

Description

technical field [0001] The invention belongs to the field of leather tanning agents, and in particular relates to a nano-tanning agent based on structural memory effect and its preparation method and application. Background technique [0002] Collagen is a natural amphoteric polymer containing a variety of amino acids. The tanning process stabilizes the collagen structure by adding tanning agents, mainly through the synergistic effects of hydrogen bonds, hydrophobic bonds, van der Waals forces, ionic bonds and covalent bonds. characterization. Chrome tanning agent has been irreplaceable due to its excellent wet heat stability and process technology, but the pollution of wastewater and the harm of chromium-containing waste to the environment cannot be ignored. Therefore, the development and application of non-chrome tanning agents has become a research hotspot of clean tanning agents. [0003] Layered double metal hydroxide LDH is a kind of layered compound composed of two ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/04
CPCC14C3/04
Inventor 马建中杨晓燕石佳博杨娜高党鸽
Owner SHAANXI UNIV OF SCI & TECH
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