Preparation of Polyurethane Silicon Oxide Nanomaterials as a Binder in Leather Finishing

• Published in: Fibers and polymers 2018, 19(4), , pp.832-842
• Main Authors: Elsayed, Hamed, Attia, Rasha, Mohamed, Ola, Haroun, Ahmed, El-Sayed, Nabil
• Format: Article
• Language: English
• Subjects: Addition polymerization; Butanediol; Chemical synthesis; Chemistry; Chemistry and Materials Science; Coating; Elongation; Finishing; Leather; Mechanical properties; Nanomaterials; Nanoparticles; Organic chemistry; Polyethylene glycol; Polymer Sciences; Polyurethane resins; Silicon dioxide; Silicon oxides; Tear strength; Tearing; Thermal stability; VOCs; Volatile organic compounds; Water vapor; 섬유공학
• ISSN: 1229-9197; 1875-0052
• DOI: 10.1007/s12221-018-7979-4

Leather finishing processes using toxic organic solvent based produce volatile organic compounds (VOC), chronic exposure to this chemicals effect on workers' health causing many diseases especially lung cancer. So, polyurethane waterbased was synthesized for application in leather finishing instead of organic solvent based because it’s economic and safety for industry and workers. Preparation of water-based polyurethane (PU) depends on the reaction of polyethylene glycol (PEG, 300) with isophorone diisocyanate (IPDI) and the reaction of IPDI-1,4-butanediol (BDO) together with dimethylolpropionic acid (DMPA), was synthesized by poly-addition polymerization reaction. PU was then modified with different amounts of silicon dioxide nanoparticles (1-5 % SiO 2 ), used as a binder in leather finishing. Leather coated was characterized physically, chemically and thermally by FTIR, GPC, DLS, TEM, SEM and TGA. The results revel that, water vapor permeability (WVP) of leather coated with PU modified with SiO 2 showed improvement due to the existence of SiO 2 particles which increases the interspaces of the polyurethane coating. SEM showed that when the amount of SiO 2 nanoparticles increases, there is uniform nanoparticles accumulated can be observed. EDX prove the presence of Si and O 2 elements and the formation of SiO 2 nanoparticles. Mechanical properties discussed that tensile strength; tear strength and elongation at break % increase with increase SiO 2 concentration until 3 % SiO 2 nanoparticles. TGA showed an improvement of thermal stability of coated leather modified with SiO 2 . Therefore, this study succeeded in preparation of safe, ecofriendly of water-based polyurethane binders which modified with SiO 2 for using in leather finishing.