Method for preparing protein filling material for leather preparation by using leather preparation chromium-containing leftover material as raw material

A technology of leftovers and protein, applied in animal/human protein, application, small raw hide/large raw hide/leather/fur processing, etc., can solve the problems of unfavorable industrial production, difficult to stabilize the use process, etc., and achieve significant economic and social benefits , Good retanning and filling function, the effect of meeting the limited requirements

Inactive Publication Date: 2008-09-10
SICHUAN UNIV +1
View PDF2 Cites 13 Cited by
  • 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,

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Grind the chromium-containing leftovers obtained from the wet blue sheet, take 100g, soak for 48 hours with 0.1wt% NaOH solution of 500ml, drain the water, put the above-mentioned pretreated chromium-containing leftovers into a tank equipped with a stirrer, thermometer and In the reaction kettle of the reflux condenser, add 6g NaOH, then add 500ml water, hydrolyze at a temperature of 50°C for 20 hours to obtain a viscous dark liquid; after cooling the hydrolyzate, adjust the pH to 7 with hydrochloric acid, and filter to obtain 520ml of hydrolyzate with a solid content of 10%, the filtrate is concentrated and dried to obtain protein filler for tanning, the filter residue is firstly added with 100g of water, and then the pH is adjusted to 2 with 2M sulfuric acid solution to obtain Cr 2 (SO 4 ) 3 Green solution, used as chrome tanning agent.

Embodiment 2

[0021] The chromium-containing leftovers obtained by the piece of wet blue are minced, get 100g, and use 400ml of 1wt%MgO and 1wt%Na 2 CO 3 Soak the solution for 24 hours, drain the water, put the chromium-containing leftovers after the above pretreatment in a reaction kettle with a stirrer, a thermometer and a reflux condenser, add 10g MgO and 5g Na 2 CO 3 , add 400ml water again, hydrolyze at temperature 70 ℃ for 10 hours, obtain viscous shape dark liquid; After concentrating and drying, the protein filler for tanning is obtained. Add 120g of water to the filter residue, and then adjust the pH to 2.5 with 2.2M sulfuric acid solution to obtain Cr 2 (SO 4 ) 3 Green solution, used as chrome tanning agent.

Embodiment 3

[0023] The chromium-containing leftovers obtained from the piece of wet blue hide are minced, get 100g, and use 450ml of 2wt%NaHCO 3 Soak in the solution for 10 hours, drain the water, put the chromium-containing leftovers after the above pretreatment in a reaction kettle with a stirrer, a thermometer and a reflux condenser, add 20g CaO, then add 450ml water, and hydrolyze at a temperature of 95°C for 2 hours, to obtain viscous dark liquid; after cooling the hydrolyzate, adjust the pH to 10 with hydrochloric acid, filter to obtain 300ml of hydrolyzate with a solid content of 20%, the filtrate is concentrated and dried to obtain protein filler for tanning, filter residue First add 150g of water, then adjust the pH to 3 with 2.5M sulfuric acid solution to obtain Cr 2 (SO 4 ) 3 Green solution, used as chrome tanning agent.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for preparing protein fillers used for tanning by taking tanning chrome containing scrap materials as materials. The invention is characterized in that chrome containing scrap materials obtained from pieced wet blue are ground, and 100 portions by weight of chrome containing scrap materials are picked up and soaked in an alkali compound solution with the concentration of between 0.1 and 2wt percent, which at least submerges chrome containing scrap materials, for 10 to 48 hours, and the chrome containing scrap materials are drained, and the pretreated chrome containing scrap materials are put in a reaction kettle provided with a stirrer, a thermometer and a reflux condenser, and 6 to 20 portions by weight of alkali compounds and water at least submerging chrome containing scrap materials are added, and the reaction kettle is heated to a temperature of between 50 and 95 DEG C and keeps the temperature for 2 to 20 hours, and the thick liquids with deep color are obtained, and the pH value of the thick liquids is adjusted to between 7 and 10 by an inorganic acid after the thick liquids are cooled, and the thick liquids are filtered, and the filtrate with the solid content of between 10 and 20 percent, which is rich in containing collagen polypeptides, and the filter residues are obtained, and finally the protein fillers for tanning are obtained after the filtrate is condensed and dried; the filter residues are added with 100 to 150 portions by weight of water and has the pH value adjusted to between 2 and 3 by the inorganic acid solution, which obtains a Cr2(SO4)3 green solution used for the chroming agent.

Description

technical field [0001] The invention relates to a method for preparing protein filler for tanning by taking chromium-containing scraps of leather as raw materials, and belongs to the field of utilization of scraps and waste residue resources in tanning. Background technique [0002] A large amount of chromium-containing solid wastes—chromium-containing scraps are produced in the process of tanning production. According to reports, only in several major leather-making areas such as South China Sea, Wenzhou, and Xinji, millions of tons of chromium-containing scraps will be produced every year. The main ingredient is collagen, and it 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, Journal of Shaanxi University of Science and Technology, 2004, 22: 3, 45-49) For a long time, the research on the utilization of chromium-containing scraps has been limited to manufacturing For recyc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C07K1/12C07K14/78C14C3/00C12S7/00
Inventor 李国英刘文涛黄海光王海霞
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap