Treatment process for reducing content of hexavalence chromate in leather
A treatment method and hexavalent chromium technology, applied in the field of tanning, can solve the problems of few fatliquoring additives, slow alkali-lifting speed, long practical application, etc., achieving simple process and operation, low treatment cost and wide application range. Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0026] Example 1
[0027] First, weigh the sodium thiosulfate and prepare it into an aqueous solution with a concentration of 0.5% by mass, and then spray the configured sodium thiosulfate aqueous solution evenly on a batch (100 sheets) with a hexavalent chromium content of 15 mg / kg. Spray 3 times on the meat surface of the finished brown cowhide upper leather. Finally, the leather meat surface sprayed with the aqueous solution of sodium thiosulfate reducing agent is stacked in a room temperature sheltered environment with a relative humidity of 55-60%. After being placed for 2 days, it can be processed according to the subsequent normal process conditions. No hexavalent chromium was detected in the finished leather.
Example Embodiment
[0028] Example 2
[0029] First, weigh ferrous sulfate and prepare it into an aqueous solution with a concentration of 1.0% by mass, and then spray the configured ferrous sulfate aqueous solution evenly on a batch (100 sheets) of light coffee with a hexavalent chromium content of 20mg / kg. The meat surface of the finished pigskin garment leather is sprayed twice, and finally the leather meat sprayed with the ferrous sulfate reducing agent aqueous solution is stacked on the meat surface in a room temperature sheltered environment with a relative humidity of 50-55%, and placed in a sheltered environment for 5 After days, it can be processed according to the subsequent normal process conditions. No hexavalent chromium was detected in the finished leather.
Example Embodiment
[0030] Example 3
[0031] First, weigh sodium sulfite and ferrous ammonium sulfate at a mass ratio of 2:1, and prepare them into a mixed aqueous solution with a concentration of 2.5% by mass, and then spray the mixed aqueous solution of sodium sulfite and ferrous ammonium sulfate with a spray gun evenly on a batch (100 sheets) The meat surface of the finished black goatskin garment leather with hexavalent chromium content of 30mg / kg was sprayed twice, and finally the leather meat sprayed with the aqueous solution of sodium sulfite and ferrous ammonium sulfate reducing agent was stacked on the meat surface In a room temperature sheltered environment with a relative humidity of 55-65%, leave it in sheltered form for 7 days, and then treat it according to the following conventional process conditions. It was detected that the content of hexavalent chromium in the finished leather was 0.21mg / kg.
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
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