Preparation And Properties Of Inorganic Nanoparticles Modified Melamine Fiber

In this paper, thermosetting melamine-formaldehyde resin as matrix materials and inorganic nano-SiO2, TiO2 paticles as modifier were selected to obtain the inorganic nanoparticles modified the melamine composite fiber with their average diameter of 50μm by the dry spinning, and their structures and properities were extensively studied. The nano-SiO2/melamine fibers were prepared by situ polymerization, and the microstructures and macronatures of products were investigated by FTIR, SEM, Single Fiber Strength Tester and TG, and the difference of composite fibers between modified nanoparticles by coupling agent and unmodified nanoparticles were compared. The results showed that:Because of the cross-linking reaction among borax,MF and PVA to form interpenetrating network structure, spinning solution can be stabled at 45℃for more than 72 h;Coupling agent KH570 can be grafted onto the surface of nano-SiO2 and improve the interface property between SiO2 and MF, when the contents of modified nano-SiO2 were beyond 1%(wt) of composite fibers, breaking elongation percentage (6.18%) and fracture strength (154.9 MPa) of the modified fibers reached the maximum. Compared with the unmodified nano-SiO2/composite fibers, two above performance indexs were increased by 21.8% and 13.8% respectively; and the activation energy of the composite fibers modified by the nano-SiO2 increased by 23.5%;Coupling agent 102 can be grafted onto the surface of nano-TiO2 and improved the interface performance between TiO2 and MF resin. And breaking elongation rate and fracture strength of the nano-TiO2 modified fiber increased by 20.4% and 9.6% respectively compared with the unmodified fibers; and the modified fibers showed good heat resistance based on their weight loss temperature 363.8℃;The electrospinning process of melamine fiber were preliminarily studied, and the effect of the contents of fiber-forming agent PVA on the fiber morphology was analyzed by the microscope images. The results showed that when the PVA content was 7%, and the electrical field intensity was 1.5 kV/cm, the melamine fibers non-woven with average diameter of 1μm and without beads structure were obtained.