Preparation of acrylic resin/montmorillonite nanocomposite via in-situ polymerization for leather tanning agent

摘要

Acrylic resin/montmorillonite (AR/MMT) nanocomposite was prepared using Na + -montmorillonite (Na + -MMT) via in-situ polymerization of hydrophilic monomer in aqueous medium. The synthetic conditions, such as the contents of MMT and ammonium persulfate (APS), the molar ratio of different monomers and the dosage of sodium bisulfite, on the application properties of nanocomposite were investigated in details. The thickness increment ratio, the wet-heat resistance and the tensile, slit and burst strengths of leather tanned by AR/MMT were improved and elongations at break and given load were slightly reduced, in contrast to AR treatment; the wet-heat resistance and the physical mechnical properties of leather tanned by 6% AR/MMT associated with 2% chromate were a little lower than 8% chromate tanned. As well as, AR/MMT facilitate to absorption of chromate. Compared with conventional chrome tanning, the dosage of chromate reduces 75%. Scanning Electron Microscope (SEM) pictures of leather samples indicated that the collagen fiber of leather sample tanned by AR/MMT was well dispersed when compared to AR and pure chromate treatment. X-ray Diffraction (XRD) and Transmission Electron Microscope (TEM) confirmed AR/MMT is exfoliated nanocomposite.