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Preparation method of aluminum-oxidized starch complex tanning agent

A technology for oxidizing starch and complex compounds, which is applied in the field of preparation of natural polymer tanning agents, can solve the problems of low shrinkage temperature of leather, easy tanning of leather, etc., and achieves difficult tanning, high leather yield and high fullness. Effect

Inactive Publication Date: 2012-10-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of preparation method of aluminum-oxidized starch complex tanning agent, the aluminum-oxidized starch complex tanning agent that is made by the preparation method of the present invention solves the problem of existing aluminum tanning agent tanning. The leather is easy to untan, and the shrinkage temperature of the leather after tanning with starch tanning agent is not high, etc.

Method used

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  • Preparation method of aluminum-oxidized starch complex tanning agent
  • Preparation method of aluminum-oxidized starch complex tanning agent

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Step 1: Mix industrial cornstarch and water at a molar ratio of 1:10, then add catalyst ammonium metavanadate and concentrated nitric acid with a concentration of 75% to it in sequence, the molar ratio of catalyst to starch is 0.05:1, concentrated nitric acid The molar ratio to starch is 0.5:1, stirring and reacting at 10°C for 10h;

[0027] Step 2, extracting and washing the product of step 1 with ethanol to obtain oxidized starch with a high degree of carboxyl substitution;

[0028] Step 3, dry the oxidized starch and mix it with aluminum sulfate at a mass ratio of 0.5:1 to obtain a mixture. Now add water 100 times the total mass of the mixture to the mixture to fully dissolve it, and adjust the pH value to 3. At 20 Oscillate in a water bath constant temperature oscillator at ℃ for 30h;

[0029] Step 4: Place the solution after the oscillation reaction in a rotary evaporator to evaporate excess water, take it out, and place it in an oven at 60° C. to dry to obtain th...

Embodiment 2

[0031] Step 1: Mix industrial potato starch and water at a molar ratio of 1:5, and then add catalyst ammonium metavanadate and concentrated nitric acid with a concentration of 75% to it in turn. The molar ratio of catalyst to starch is 0.01:1, concentrated nitric acid The molar ratio to starch is 1:1, and the reaction is stirred at 30°C for 6h;

[0032] Step 2, extracting and washing the product of step 1 with acetone to obtain oxidized starch with a high degree of carboxyl substitution;

[0033] Step 3, dry the oxidized starch and mix it with aluminum sulfate at a mass ratio of 1:1 to obtain a mixture. Now add water 100 times the total mass of the mixture to the mixture to fully dissolve it, and adjust the pH value to 1. At 40 Oscillate in a water bath constant temperature oscillator at ℃ for 20h;

[0034] Step 4: Place the solution after the oscillation reaction in a rotary evaporator to evaporate excess water, take it out, and place it in an oven at 70° C. to dry to obtain...

Embodiment 3

[0036] Step 1: Mix industrial rice starch and water at a molar ratio of 1:8, then add catalyst ammonium metavanadate and concentrated nitric acid with a concentration of 75% to it in turn, the molar ratio of catalyst to starch is 0.08:1, concentrated nitric acid The molar ratio with starch is 2:1, stirring and reacting at 50°C for 4h;

[0037] Step 2, extracting and washing the product of step 1 with ethanol to obtain oxidized starch with a high degree of carboxyl substitution;

[0038] Step 3, dry the oxidized starch and mix it with aluminum sulfate at a mass ratio of 3:1 to obtain a mixture. Now add water 100 times the total mass of the mixture to the mixture to fully dissolve it, and adjust the pH value to 4. At 60 Oscillating in a water bath constant temperature oscillator at ℃ for 10h;

[0039] Step 4, place the solution after the oscillation reaction in a rotary evaporator to evaporate excess water, take it out and place it in an oven at 65° C. to dry to obtain the alum...

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Abstract

A preparation method of an aluminum-oxidized starch complex tanning agent comprises steps of: first mixing starch and water, adding concentrated nitric acid and a catalyst, and stirring for reaction, washing reaction products with ethanol or acetone to obtain the oxidized starch; and evenly mixing the oxidized starch and aluminum ions, oscillating, steaming out excessive water by a rotary evaporimeter, and drying the obtained product. The method of the invention can effectively improve the tanning property of the aluminium tanning agent, maintain original advantages of the aluminum tanning agent and greatly mitigate the phenomenon of detanning. The method of the present invention employs nitrate as an oxidant to oxidize hydroxyl groups to generate oxidized starch with high degree of carboxylic substitution, and utilizes a principle of acid degradation to reduce the relative molecular mass of the oxidized starch, so as to obtain aluminum-containing macromolecular tanning agent with good permeability, high absorption rate and excellent tanning property. The obtained leather tanning agent has good tanning and filling performances, and is suitable for main tanning and retanning; after the main tanning, a pickled skin has a shrinkage temperature raised to 90 DEG C, gains pure white leather body and obvious thickness increase; and after retanning, a product has good elasticity, bright color, gloss, and soft and full handle.

Description

technical field [0001] The invention relates to a preparation method of a natural polymer tanning agent, in particular to a preparation method of an aluminum-oxidized starch complex tanning agent. Background technique [0002] Leather tanning agent is a chemical commonly used in the leather industry. At present, chrome tanning agent is mainly used in light leather production. It can endow light leather with excellent properties such as softness, plumpness, and high moisture and heat resistance. However, the trivalent Chromium can be slowly oxidized to hexavalent chromium in the process of use, which has potential carcinogenicity, and the environmental pollution and water pollution caused by it cannot be ignored. Therefore, it is very necessary to develop chrome-free tanning agents to reduce or replace chrome tanning agents. The starch tanning agent has the characteristics of mild reaction conditions, low energy consumption, and unique process in the preparation process. The...

Claims

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Application Information

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IPC IPC(8): C14C3/08
Inventor 王学川李飞虎任龙芳强涛涛
Owner SHAANXI UNIV OF SCI & TECH
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