Synthesis and Application of Dihydroxyalkylamino Groups Modified Polysiloxane

Abstract Several single- and double-dihydroxyalkylamino groups terminated polysiloxanes with different molecular weights were prepared by a four-step synthesis method using diethanolamine, allyl bromide, and hydrogen-containing silicone oil. The emulsified dihydroxyalkylamino group-modified polysiloxane lotion was used as a softener in fabric finishing. Compared to fabric treated with the commercial amino silicone oil softener, fabric treated with them can improve the hydrophilicity from hydrophobic to hydrophilic, and the tertiary amine structure can resist yellowing defects of the amino silicone oil with the whiteness difference value in line with the normal yellowing value change range. It will not affect the color brightness of the fabric. Fabric treated with such modified polydimethylsiloxane will increase softness rating greater than 4.0. Meanwhile, its improved anti-static ability was indicated by fabric resistance lowered from 10¹³ to 10¹² Ω, and fracture strength was enhanced from 211.2 N to more than 400 N.