Abstract:

Dihydroxyethyl-terminated polysiloxane (diHE-PDMS) was synthesized from dihydrogen-terminated polysiloxane and hydroxyethyl acrylate by hydrosilylation. Subsequently, diHE-PDMS, dihydroxypropyl-terminated polysiloxane and hydroxyl-terminated polysiloxane were applied in the synthesis of silicone-acrylate emulsion. The effect of polysiloxanes with different hydroxyl groups on the monomer conversion, gel rate, particle size and its distribution and the surface morphology of silicone-acrylate copolymers printed fabrics were studied. Properties of pigment printed cotton fabrics were also investigated. Silicone-acrylate emulsion synthesized using diHE-PDMS possesses small particle size (115.7 nm) and exhibited high monomer conversion (98.60%) and extremely low gel rate（＜0.01%). Surface morphology analysis of pigment printed fabrics showed that the pigment particles could be coated well when applying silicone-acrylate emulsions using diHE-PDMS and hydroxyl-terminated polysiloxane as the raw materials, and water asorption of their films was low (7.50%). Whereas there still existed a few pigment particles that have not been coated well by the silicone-acrylate copolymer when using dihydroxypropyl-terminated polysiloxane, and its water asorption is high (33.50%). Moreover, the addition of polysiloxane could remarkably improve the hand feeling of pigment printed fabrics.

Key words: polysiloxane, silicone-acrylate emulsion, hydroxyethyl group, pigment printing