Oxidized graphene and trivalent chromium composited tanning agent and preparation method thereof

A technology of graphene and trivalent chromium, which is applied in chemical treatment of small raw hide/big raw hide/leather skin/fur, small raw hide/big raw hide/leather/fur treatment, tanning treatment, etc. It can solve the problem of limited effect and chromium content Sludge, a large amount of chromium-containing wastewater, etc.

Active Publication Date: 2014-12-24
苏州盛泽科技创业园发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of chrome tanning agents will also produce chrome pollution that is difficult to control. In the chrome tanning process, a large amount of chrome-containing wastewater, chrome-containing sludge, chrome-containing waste dander, etc. will be produced. It may be transformed into hexavalent chromium which is more harmful, so many countries in the world have made strict regulations on the content of hexavalent chromium in leather products
At present, the unanimous opinion in domestic and foreign leather circles is to reduce the amount of chrome tanning agent as much as possible. has very limited effect

Method used

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  • Oxidized graphene and trivalent chromium composited tanning agent and preparation method thereof
  • Oxidized graphene and trivalent chromium composited tanning agent and preparation method thereof

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preparation example Construction

[0021] The preparation method of described graphene oxide nano flake dispersion liquid is: 2 parts of graphite powders are slowly added to 50 parts of mass fractions and are the mixture of 98% concentrated sulfuric acid and 3 parts of mass fractions of 85% concentrated phosphoric acid, and the control system The temperature is 5°C, after stirring evenly, slowly add 3 parts of potassium permanganate and 3 parts of potassium dichromate mixture to react for 3 hours, then raise the temperature to 30°C and continue the reaction for 2 hours, then slowly add 80 parts of deionized water, heat up React at 90°C for 1 hour; then cool down to 30°C and add 20 parts of hydrogen peroxide solution with a mass fraction of 30% dropwise, react for 50 minutes, prepare graphene oxide nanosheet dispersion liquid by ultrasonic dispersion for about 1 hour, and detect graphite oxide The size of the ene nanosheets is in the range of 4 to 20nm, and the oxygen content of graphene oxide is in the range of ...

Embodiment 1

[0027] Step 1: Preparation of graphene oxide.

[0028] Slowly add 2 parts of graphite powder to a mixture of 50 parts of concentrated sulfuric acid with a mass fraction of 98% and 3 parts of concentrated phosphoric acid with a mass fraction of 85%, control the temperature of the system at 5°C, stir well and slowly add 3 parts of high manganese Potassium dichromate and 3 parts of potassium dichromate mixture were reacted for 3 hours, then heated up to 30°C and continued to react for 2 hours, then slowly added 80 parts of deionized water, heated to 90°C and reacted for 1 hour; then cooled to 30°C and added dropwise 20 A hydrogen peroxide solution with a mass fraction of 30% was reacted for 50 minutes, and the graphene oxide nanosheet dispersion was prepared by ultrasonic dispersion for about 1 hour. The size of the graphene oxide nanosheets was detected to be in the range of 4-20nm. The oxygen content is in the range of 29%~35%.

[0029] Step 2: Preparation of stable dispersant...

Embodiment 2

[0034] Step 1: Preparation of graphene oxide.

[0035] Slowly add 2 parts of graphite powder to a mixture of 50 parts of concentrated sulfuric acid with a mass fraction of 98% and 3 parts of concentrated phosphoric acid with a mass fraction of 85%, control the temperature of the system at 5°C, stir well and slowly add 3 parts of high manganese Potassium dichromate and 3 parts of potassium dichromate mixture were reacted for 3 hours, then heated up to 30°C and continued to react for 2 hours, then slowly added 80 parts of deionized water, heated to 90°C and reacted for 1 hour; then cooled to 30°C and added dropwise 20 A hydrogen peroxide solution with a mass fraction of 30% was reacted for 50 minutes, and the graphene oxide nanosheet dispersion was prepared by ultrasonic dispersion for about 1 hour. The size of the graphene oxide nanosheets was detected to be in the range of 4-20nm. The oxygen content is in the range of 29%~35%.

[0036] Step 2: Preparation of stable dispersant...

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Abstract

The invention discloses an oxidized graphene and trivalent chromium composited tanning agent. The oxidized graphene and trivalent chromium composited tanning agent is prepared from the following raw materials in parts by weight: 50-60 parts of oxidized graphene nanosheet dispersion liquid, 6-8 parts of potassium dichromate, 10-15 parts of sodium carbonate, and 0.5-0.1 part of a dispersing agent. The invention further discloses a preparation method of the oxidized graphene and trivalent chromium composited tanning agent. The leather tanning agent disclosed by the invention has the advantages of low dosage for tanning, high absorptivity and low residual amount of a chromium compound in the waste liquor; furthermore, the production technology for the tanning agent is special, the technical process is easy to operate, and the tanning agent is of a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of preparation of leather tanning agents, and in particular relates to a graphene oxide-trivalent chromium complex tanning agent and a preparation method thereof. Background technique [0002] At present, chrome tanning agents have been widely used due to the best overall performance of tanned leather and the easy operation of the tanning process. At present, chrome tanned leather accounts for about 90% of leather output (see: Li Chenying, Chen Hualin, Luo Rong, Liu Bailing Chromium in the Tanning Industry: An Odyssey. Chromium in the Tanning Industry: An Odyssey from Cradle to Grave[J]. Journal of the society of leather technologists and chemists, 2012, 96(4): 133-140). However, the use of chrome tanning agents will also produce chrome pollution that is difficult to control. In the chrome tanning process, a large amount of chrome-containing wastewater, chrome-containing sludge, chrome-containing waste dand...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/06
Inventor 吕生华李莹周庆芳崔亚亚
Owner 苏州盛泽科技创业园发展有限公司
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