Abstract: A silicone modified polyacrylate latex was synthesized with double terminated acryloyloxy-propyl polysiloxane as modifier, and applied in pigment printing. The effects of addition methods of modifier and its dosages on the properties of modified latex and modified latex film were studied, the properties of modified latex, latex film and pigment printing were measured, and compared with that of the polyacrylate latex modified with double terminated acryloyloxy-polyether polysiloxane. The results showed that when modifier was added by being mixed with acrylate monomer, and its dosage was 8%~10%, the monomer conversion of emulsion polymerization was higher, the agglomerate rate was lower; the particle size of emulsion was about 62nm and its distribution was narrow, the modified film had low water absorption and higher fracture work, and the pigment printing fabric had good color fastness and soft handle. Compared with the polyacrylate latex modified with double terminated acryloyloxy-polyether polysiloxane, the polyacrylate latex film modified with double terminated acryloyloxy-propyl polysiloxane had better hydrophobic property and tensile properties, so its pigment printing had resistance to wet rubbing fastness.

Key words: double terminated acryloyloxy-propyl polysiloxane, emulsion polymerization, organic silicone modification, polyacrylate, pigment printing