A Fluorescent Tracer Based on Castor Oil for Monitoring the Mass Transfer of Fatliquoring Agent in Leather

Fatliquoring is one of the most important processes in leather making, in which the collagen fibers are split effectively, while the crust acquires a good softness and mechanical strength. The effectiveness of fatliquoring depends not only on the variety and dosage of fatliquoring agent but also on...

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Bibliographic Details
Published in:Materials 2022-02, Vol.15 (3), p.1167
Main Authors: Wen, Hongmei, Wang, Yulu, Zhu, Hongxia, Jin, Liqiang, Zhang, Feifei
Format: Article
Language:English
Subjects:
Aluminum
Castor oil
Chemicals
Collagen
Enzymes
Fatliquors
Fluorescence
Fourier transforms
Investigations
Leather
Maleic anhydride
Mass transfer
Mechanical properties
NMR
Nuclear magnetic resonance
Oils & fats
Sodium
Softness
Tracing
Vegetable oils
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Summary:Fatliquoring is one of the most important processes in leather making, in which the collagen fibers are split effectively, while the crust acquires a good softness and mechanical strength. The effectiveness of fatliquoring depends not only on the variety and dosage of fatliquoring agent but also on its distribution in hierarchical collagen fiber layers. Up to now, the research about the mass transfer of fatliquoring agent in leather is very limited because quantifying the distribution of invisible fatliquor in leather is very difficult. In this paper, a fluorescent tracing technique based on modified castor oil was established and send used to investigate the mass transfer of fatliquor in leather. The crucial fluorescent tracer was synthesized favorably by the reaction of castor oil, successively with maleic anhydride and 5-aminofluorescein, which was confirmed by FTIR, H NMR and DSC. The fluorescent tracer was pH-sensitive and emitted an intense fluorescent signal at pH 8-10. Then, it was applied to monitor the fatliquoring process in real-time. Compared with Sudan IV or Nile Blue sulphate dyeing tests, this fluorescent tracing technique could conveniently visualize and quantify the penetration and distribution of fatliquor in leather process.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15031167