Dialdehyde sodium alginate bonded dicyandiamide for formaldehyde-free leather production with enhanced properties

Dialdehyde sodium alginate (DSA) is an eco-crosslinker attracting extensive interest while undergoing limited large-scale applications. Herein, we employed DSA to react with dicyandiamide (DA) for engineering a biomass-derived retanning agent (BDR) towards addressing the long-term toxicity of residu...

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Bibliographic Details
Published in:Carbohydrate polymers 2022-11, Vol.295, p.119838-119838, Article 119838
Main Authors: Ding, Wei, Wang, Yating, Sun, Jian, Bao, Lihong, Pang, Xiaoyan
Format: Article
Language:English
Subjects:
Chrome-free leather
Filling performance
Formaldehyde
Periodate oxidation
Physical properties
Sodium alginate
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Summary:Dialdehyde sodium alginate (DSA) is an eco-crosslinker attracting extensive interest while undergoing limited large-scale applications. Herein, we employed DSA to react with dicyandiamide (DA) for engineering a biomass-derived retanning agent (BDR) towards addressing the long-term toxicity of residual formaldehyde (FA) in leather caused by amino resins. Results confirmed that BDR reserved the structural features of DSA by grafting DA onto DSA molecules. Owing to the suitable molecular weight (main components, 1424–1462 g/mol) and abundant oxygen-containing groups of BDR endowed by DSA, BDR-treated chrome-free leather showed higher hydrothermal stability (82.4 °C), thickening ratio (13.93 %), mechanical strengths (17.2 N/mm2 for tensile strength and 120 N/mm for tear strength), and fullness compared with industrial dicyandiamide-FA-resin (DFR)-treated leather. The FA-free feature of DSA led to BDR-treated leather containing no FA, while FA in DFR-treated leather reached 591.5 mg/kg. This work provided new insights into broadening the large-scale application scopes of DSA. Dialdehyde sodium alginate was exploited to bond with dicyandiamide for producing formaldehyde-free eco-leather with excellent mechanical and organoleptic properties. [Display omitted] •A new application scope of DSA was exploited via addressing FA residual in leather.•DSA can bond with dicyandiamide to prepare biomass-derived retanning agent (BDR).•Reducing FA from 591.5 mg/kg to 0 via retanning leather using BDR.•BDR is much better in retanning than commercial dicyandiamide formaldehyde resins.•Achieving FA-free retanning for chrome-free eco-leather production.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2022.119838