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Preparation method of high-performance carbon nanotube modified chrome tanning agent

A carbon nanotube modification and carbon nanotube technology, applied in the field of leather, can solve the problems of limited reserves, adverse environmental effects, etc., and achieve the effects of improving the effect, being environmentally friendly, and improving the tensile strength and elongation at break.

Inactive Publication Date: 2010-11-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the raw material for producing chrome tanning agent - red vanadium (potassium dichromate, sodium dichromate) not only has limited reserves on the earth
Moreover, the trivalent chromium in the waste chromium solution that has not been completely absorbed by the skin is easily transformed into highly toxic hexavalent chromium under certain conditions, which has adverse effects on the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Purification and modification of carbon nanotubes: first, mix sulfuric acid with a mass concentration of 95% and nitric acid with a mass concentration of 68% in a volume ratio of 1:1 to form a mixed acid solution; then, take a relative mixed acid mass of 0.025 Add carbon nanotubes twice as many times into the mixed acid solution, and ultrasonically make it form a stable suspension; then soak for 24 hours, then heat, condense and reflux at 120°C for 1 hour, then repeatedly wash with water and centrifuge until the pH value is 7, to remove Impurities in carbon nanotubes, and bring active reactive groups on the surface;

[0019] Step 2: Weighing 100 parts of potassium dichromate with a mass concentration of 100%, dissolving it in 350 parts of water at a temperature of 75°C, and then slowly adding a mass of (133.3-B) parts of a mass concentration According to 100% sulfuric acid and 0.01 parts by mass of the carbon nanotubes obtained in step 1, then transfer to an ult...

Embodiment 2

[0025] Step 1: Purification and modification of carbon nanotubes: first, mix 96% sulfuric acid with a mass concentration of 67% nitric acid in a volume ratio of 1:1 to form a mixed acid solution; then, take a relative mixed acid mass of 0.025 Add carbon nanotubes twice as many times into the mixed acid solution, and ultrasonically make it form a stable suspension; then soak for 24 hours, then heat, condense and reflux at 120°C for 1 hour, then repeatedly wash with water and centrifuge until the pH value is 6, to remove Impurities in carbon nanotubes, and bring active reactive groups on the surface;

[0026] Step 2: Weighing 100 parts of sodium dichromate with a mass concentration of 100%, making it dissolve in 350 parts of water at a temperature of 75°C, and then slowly adding a mass of (132-B) parts of a mass concentration According to 100% sulfuric acid and 0.01 parts by mass of the carbon nanotubes obtained in step 1, then transfer to an ultrasonic cell pulverizer to form a...

Embodiment 3

[0032] Step 1: Purification and modification of carbon nanotubes: first, mix 98% sulfuric acid with a mass concentration of 65% nitric acid at a volume ratio of 1:1 to form a mixed acid solution; then, take a relative mixed acid mass of 0.025 Add carbon nanotubes twice as many times into the mixed acid solution, and ultrasonically make it form a stable suspension; then soak for 24 hours, then heat, condense and reflux at 120°C for 1 hour, then repeatedly wash with water and centrifuge until the pH value is 8, to remove Impurities in carbon nanotubes, and bring active reactive groups on the surface;

[0033] Step 2: Weighing 100 parts of potassium dichromate with a mass concentration of 100%, dissolving it in 350 parts of water at a temperature of 75°C, and then slowly adding a mass of (133.3-B) parts of a mass concentration According to 100% sulfuric acid and 0.01 parts by mass of the carbon nanotubes obtained in step 1, then transfer to an ultrasonic cell pulverizer to form a...

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PUM

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Abstract

The invention provides a preparation method of high-performance carbon nanotube modified chrome tanning agent, which comprises the following steps of: after mixing a carbon nanotube with an acid solution, and ultrasonically processing the mixture to prepare a suspension; then, heating, condensing, refluxing, repeatedly washing and centrifugally separating until the pH value becomes neutral; subsequently, after dissolving dichromate in water, slowly adding sulfuric acid and the treated carbon nanotube; ultrasonically processing to prepare a stable suspension; taking glucose and adding water to dissolve the glucose; dropwise adding the water solution of glucose into the suspension containing dichromate while stirring so as to produce a carbon nanotube modified chrome tanning liquid in-situ; and finally, settling and placing for long time. The chrome tanning agent enhances the bonding force of chrome, increases the quality and the properties of leather, is friendly to environment, reduces pollution and decreases resource waste.

Description

【Technical field】 [0001] The invention belongs to the field of leather, in particular to a preparation method of a high-performance carbon nanotube modified chrome tanning agent. 【Background technique】 [0002] The qualitative change process of converting raw hides into leather is called tanning, and the chemical materials used in tanning to convert hides into leather are called tanning agents. There are many kinds of tanning agents that can be used in the leather production process. In various inorganic tanning Among the tanning agents, chrome tanning agents still play an irreplaceable role in many tanning agents because of their strong moisture and heat resistance, storage resistance, soft and plump hand feeling, and excellent dyeing performance. [0003] Common valence states of chromium are: +0, +3, +6, among which only trivalent chromium has tanning properties, and in nature, chromium is mainly in the form of hexavalent chromium in potassium dichromate or sodium dichrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/02
Inventor 孙友昌马建中
Owner SHAANXI UNIV OF SCI & TECH
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