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A kind of nano tanning agent based on structural memory effect and its preparation method and application

A structure memory and nanotechnology, applied in the field of leather tanning agents, can solve the problems of wastewater pollution, environmental hazards of chromium-containing waste, etc., and achieve the effects of improving uniform dispersion, enhancing adsorption performance, and increasing shrinkage temperature

Active Publication Date: 2021-10-26
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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  • A kind of nano tanning agent based on structural memory effect and its preparation method and application
  • A kind of nano tanning agent based on structural memory effect and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

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

Embodiment 3

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

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Abstract

The invention discloses a nano tanning agent based on structural memory effect and its preparation method and application, which improves the specific surface area of ​​the tanning agent and enhances the adsorption performance. The technical solution of the present invention is: a preparation method of a nano-tanning agent based on the structural memory effect, respectively weighing magnesium nitrate and aluminum nitrate and dissolving them in water to prepare metal salt solution A, and dissolving sodium carbonate in water to prepare sodium carbonate solution B; Then add solution A dropwise into solution B, and at the same time adjust the pH value to 10~12 with sodium hydroxide solution, nucleate and crystallize at 75°C for 10 hours, centrifuge, freeze-dry, and then put the obtained product at 350°C~450°C Calcined at ℃ for 2~4h to get nano tanning agent. The nano tanning agent prepared by the invention has a unique structure memory effect. During the tanning process, the external environment is adjusted to form an organic / inorganic nano hybrid material by adjusting the external environment to increase the shrinkage temperature of crust leather.

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 Patents(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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