Influence of relative molecular weight of polysiloxane segment on modified polysiloxane

In order to solve the problems of amino modified silicone emulsion floating oil and its finished fabric on easy yellowing and hydrophobicity,a kind of block type polyether amine modified polysiloxane was synthesized from diepoxy-terminated polysiloxane and polyether amine( ED-600) as raw materials by nucleophilic ring-opening reaction of epoxy groups with amino groups. The Influence of relative molecular weight of polysiloxane segment of diepoxy-terminated polysiloxane on the epoxy group conversion rate,the properties of emulsion,and the properties of finished fabric were studied,the relative molecular weight of polysiloxane segment was optimized,and the properties of modified polysiloxane emulsion and its finished cotton fabric were measured. The results indicated that: as the relative molecular weight of the polysiloxane segement was 4 300,the epoxy groups conversion rate was high; the Mn of modified polysiloxane was 1. 73 × 104,and the molecular weight distribution of modified polysiloxane was narrow;and the modified polysiloxane emulsion had stable property and no floating oil,the average particle size was 54 nm,and the distribution of particle size was centralized. Compared with the fabric finished by amino silicone and side-chained polyether modified amino-silicone,the fabric finished by the modified polysiloxane had better softness,hydrophilicity and relatively-low yellowing.