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Preparing retanning filler in use for leather from tanning wastes-chromel leather bits

A technology of chrome tanned leather scraps and leather waste, which is applied in the field of processing tanning waste-chrome tanned leather scraps, can solve the problems of landfill, chrome tanned leather scraps cannot find suitable uses, etc., and achieves excellent performance and improved Physical and mechanical properties, the effect of good softness

Inactive Publication Date: 2004-10-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
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AI Technical Summary

Problems solved by technology

In addition, there is still a large amount of chrome tanned leather scraps that have to be landfilled because they cannot find a suitable use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]The specific implementation process of embodiment 1:

[0021] The first step, the specific operation of preparing protein hydrolyzate from chrome-tanned leather shavings: Weigh a certain amount of 9 g (dry weight) of chrome-tanned leather shavings, add it into a three-necked flask, and then add 120 ml of distilled water. Weigh 3 mol / L of formic acid and dissolve it in appropriate amount of distilled water (20ml). Adjust the temperature control device, after the temperature reaches the set value (85°C), add formic acid dropwise, and strictly control the hydrolysis time (2h), including the formic acid dropping time (10min). Cool down after the reaction, add a neutralizer (40% sodium hydroxide solution), adjust the pH of the system to 6.5±, and centrifuge (RPM=3000, t=10min). Finally, pour out the upper layer liquid and the lower layer sediment respectively, and save them for future use.

[0022] The second step, the specific operation of preparing the protein retanning f...

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Abstract

A process for preparing the retanning filler of leather from the leftover of Cr tanned leather includes such steps as proportionally mixing said leftover with distilled water, heating, dripping formic acid, hydrolysis reaction, cooling, adding neutralizer, regulating system pH value, centrifugal separation, and using the vinyl monomer graft modification of hydrolyzed liquid to obtain the protein-type retanning filler.

Description

Technical field [0001] The invention relates to a treatment method of tanning waste-chrome tanned leather shavings. The tanning waste is treated and reapplied in leather production. Background technique [0002] The leather industry is closely related to human life and the development of the national economy. my country has now become a major tannery country in the world. It processes more than 100 million pieces of standard cowhide every year. The export of leather products has been the top of the light industry in recent years, reaching more than 10 billion US dollars for three consecutive years. At the same time, my country's leather industry has also produced very serious pollution. The pollution problem has become a major problem that endangers the healthy and sustainable development of my country's leather industry and even its survival in the future. See China Leather Industry Association. China Leather Industry "Tenth Five-Year" Technology Proposals for Key Projects....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/32
CPCY02W30/50
Inventor 马建中刘凌云徐春华杨宗邃王文琪贺卫勃
Owner SHAANXI UNIV OF SCI & TECH
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