Cationic organofluorosilicone as deepening agent in the application of dyed polyester fabric

Abstract

Polyester fabrics are usually difficult in dyeing deeply due to their dense structure and high surface refractive index, and deepening finishing is an effective method to obtain dark polyester fabrics. In this article, octamethyl cyclotetrasiloxane (D 4 ), 1,3,5-tris (3,3,3-trifluoropropyl)-methylcyclotrisiloxane (D 3 F), and silane coupling agent KH-902 were used as main monomers to synthesize organic fluorosilicone, and further to prepare cationic organofluorosilicone (COFS) and COFS darkening agent. FTIR and 1 H-NMR were used to characterize the structure of synthetic products. The finishing experiments confirmed that COFS darkening agent had good shade darkening on dyed polyester fabrics with small color change. The optimum conditions of deepening finishing were COFS darkening agent concentration of 20%, the pick-up of 85%, and the curing temperature of 180 C. After finishing, the dyed fabric had no lowering effect on color fastness, all at grade 4 or above.

Study on hydrophobic properties of coatings enhanced by organofluorosilicone polymers

“…As a crosslinking of organic fluorine and organic silicon, organofluorosilicone polymer has the characteristics of organic fluorine and organic silicon at the same time, with low surface energy, good thermal stability and chemical corrosion resistance [10] . Due to the high bond energy of C-F bond, F atom is not only closely bonded with C atom, but also closely arranged fluorine chain, which effectively protects the main carbon chain and makes the polymer have good stability and hydrophobicity.…”

“…The fluorinated alkyl groups on the side chain of fluorinated polysiloxane have greater steric hindrance effect and greater electronegativity, which make fluorinated polysiloxane have good surface properties and excellent hydrophobicity. Because of the poor hydrophobicity and water resistance of traditional epoxy resin, fluorinated polysiloxane can be used to modify the epoxy resin, so as to improve its surface properties and greatly improve its hydrophobicity.As a crosslinking of organic fluorine and organic silicon, organofluorosilicone polymer has the characteristics of organic fluorine and organic silicon at the same time, with low surface energy, good thermal stability and chemical corrosion resistance[10] . Due to the high bond energy of C-F bond, F atom is not only closely bonded with C atom, but also closely arranged fluorine chain, which effectively protects the main carbon chain and makes the polymer have good stability and hydrophobicity.…”