Easy-to-dye porous modified polyester fiber and preparing method thereof

A preparing method for an easy-to-dye porous modified polyester fiber, comprising manufacturing the easy-to-dye porous modified polyester fiber by melting a modified polyester through a porous spinneret with FDY process;

• wherein the porous spinneret has more than 100 holes;
• the modified polyester is a product of an esterification and successive polycondensation reactions of an evenly mixed mixture of terephthalic acid, ethylene glycol, main chain silicated diol, 2,2,3,4,5,5-hexamethyl-3,4-hexanediol, and doped Sb2O3 powder;
• wherein the main chain silicated diol is selected from the group consisting of dimethylsiloxane diol, dimethyldiphenyldisiloxane glycol and tetramethyldisiloxane diol;
• and a structural formula of the 2,2,3,4,5,5-hexamethyl-3,4-hexanediol is as follows:
• wherein the doped Sb2O3 powder is obtained through a process of evenly mixing an aqueous solution containing metal ions Mx+ and a solution containing Sb3+ to obtain a mixed solution, then adding in a precipitant to the mixed solution until a pH value of the mixed solution becomes 9-10 to form a precipitate, and finally calcining and crushing the precipitate;
• wherein the metal ions Mx+ is one or more selected from the group consisting of Mg2+, Ca2+, Ba2+ and Zn2+.