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Method for preparing protein stuffing for tanning with chrome-containing scrap leather from tanning

A technology for skin slag and chromium waste is applied in the field of utilization of waste slag resources, which can solve problems such as unfavorable industrial production, difference in chromium content, and difficulty in stable use process, and achieve significant economic and social benefits, and the content of hexavalent chromium is low and good. The effect of the retanning filling function

Active Publication Date: 2012-07-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(Mu Changdao, etc., extracting collagen polypeptide from chrome leather slag to prepare the method for finishing agent and retanning agent, CN1298954) Ma Jianzhong et al. studied the hydrolysis of chrome tanned leather shavings with formic acid without dechroming, and used Vinyl monomers modify the hydrolyzate to prepare retanning agent for leather. However, because the chromium content of different batches of products will vary, the use process of the product is difficult to stabilize, which is not conducive to industrial production

Method used

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  • Method for preparing protein stuffing for tanning with chrome-containing scrap leather from tanning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Grind the chromium-containing waste skin slag of tanning, take 100g, soak 45 hours with 0.3wt% NaOH solution of 500ml, drain the water, put the above-mentioned pretreated chromium-containing waste skin In the reaction kettle of the reflux condenser, add 8g NaOH, then add 500ml water, hydrolyze at a temperature of 55°C for 18 hours, and obtain a viscous dark liquid; after cooling the collagen hydrolyzate, adjust the pH to 7 with hydrochloric acid, filter, Obtaining solid content is 10% hydrolyzate 520ml; Malonic acid, N-hydroxysuccinimide and dicyclohexyl carbodiimide are mixed in a molar ratio of 0.5: 2: 1, dissolved in dimethylformamide, and Continuous stirring and reaction at room temperature for 12 hours, filtration, and the filtrate was distilled under reduced pressure, crystallized, recrystallized, and vacuum-dried to obtain malonate-N-hydroxysuccinimide ester, and 0.104 g of malonate was added to the collagen hydrolyzate -N-hydroxysuccinimide ester was stirred and...

Embodiment 2

[0033] Grind the chromium-containing waste skin slag of tanning, get 100g, use 0.5wt%MgO and 0.5wt%Na of 400ml 2 CO 3 Soak the solution for 24 hours, drain the water, put the chromium-containing waste skin slag after the above pretreatment in a reaction kettle with a stirrer, a thermometer and a reflux condenser, add 5g MgO and 5g Na 2 CO 3 , add 400ml water again, hydrolyze at temperature 75 ℃ for 10 hours, obtain viscous shape dark liquid; Acid, N-hydroxysuccinimide and dicyclohexylcarbodiimide were mixed in a molar ratio of 0.5:1:2, dissolved in dimethylformamide, stirred continuously at room temperature for 24 hours, filtered, and the filtrate was decompressed Distillation, crystallization, recrystallization, and vacuum drying to obtain citric acid-N-hydroxysuccinimide ester, add 0.308g citric acid-N-hydroxysuccinimide ester to the collagen hydrolyzate, stir for 1 hour, concentrate and dry That is, the protein filler for tanning is obtained. The protein content of the ...

Embodiment 3

[0035] Grind the chromium-containing waste leather slag from tanning, get 100g, and use 450ml of 1.5wt%NaHCO 3 Soak in the solution for 15 hours, drain the water, put the chromium-containing waste skin slag after the above pretreatment into a reaction kettle with a stirrer, a thermometer and a reflux condenser, add 15g CaO, then add 450ml water, and heat the mixture at a temperature of 90°C Hydrolyzed for 3 hours to obtain viscous dark liquid; after cooling the hydrolyzed solution, adjust the pH to 6.5 with hydrochloric acid, filter to obtain 300ml of hydrolyzed solution with a solid content of 20%; mix malic acid, N-hydroxysuccinimide and Dicyclohexylcarbodiimide was mixed at a molar ratio of 1:2:1, dissolved in dimethylformamide, stirred continuously at room temperature for 18 hours, filtered, and the filtrate was distilled under reduced pressure, crystallized, recrystallized, and vacuum-dried To obtain malic acid-N-hydroxysuccinimide ester, add 0.3 g of malic acid-N-hydroxy...

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Abstract

The invention discloses a method for preparing protein stuffing for tanning with chrome-containing scrap leather from tanning, which is characterized in that the method comprises the following steps: rubbing the chrome-containing scrap leather from tanning and taking 100 parts, then immersing the chrome-containing scrap leather into 0.3-1.5 wt% of alkaline compound solution that at least can submerse the scrap leather for 15-45 hours, and draining; putting the pre-treated chrome-containing scrap leather into a reaction kettle equipped with a stirrer, a thermometer, and a reflux condenser; adding 8-18 parts of alkaline compound and water that at least can submerse the chrome-containing scrap leather, raising the temperature to 55-90 DEG C, and keeping for 3-18 hours to obtain thick liquid with deep color; cooling the liquid and adjusting the pH value with inorganic acid to 6-7, then filtering to obtain collagen polypeptide-rich filtrate with a solid content of 10-20%; adding 0.2-0.5 wt% of polycarboxylic acid-N-hydroxysuccinimide based on the weight of the dry basis of collagen polypeptide, and reacting at room temperature under continuously stirring for 1-3 hours; and concentrating and drying to obtain the protein stuffing for tanning.

Description

technical field [0001] The invention relates to a method for preparing a protein filler for tannery from chromium-containing waste skin dregs of tannery, and belongs to the field of utilization of waste dreg resources in tannery. Background technique [0002] A large amount of chromium-containing solid waste - chromium-containing waste hides is produced in the process of tanning production. According to reports, only a few major tanning areas such as South China Sea, Wenzhou, and Xinji can produce millions of tons of chromium-containing waste hides every year. Slag, its main component is collagen, also contains about 1.5% Cr 2 o 3 . (Wang Hongru, Lou Jianxin, etc. Discussion on several key issues in the resource utilization of waste chromium shavings, Journal of Shaanxi University of Science and Technology, 2004, 22: 3, 45-49) For a long time, the utilization of chromium-containing waste skin slag has been limited. It is used to make recycled leather and protein feed, res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/00C14C3/32
CPCY02W30/50
Inventor 李国英刘文涛刘旭
Owner SICHUAN UNIV
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