Biodegradable additive, biodegradable polyester fiber and method for producing the same, and biodegradable fabric

A biodegradable polyester fiber, which is formed through a melt spinning process, the biodegradable polyester fiber comprising:

• a polyester resin matrix;
• and
• a biodegradable additive being mixed with the polyester resin matrix through the melt spinning process, wherein the biodegradable additive includes:
• a polyester resin material;
• wherein the polyester resin material is polyethylene terephthalate (PET);
• wherein the polyester resin material has a first intrinsic viscosity of between 0.6 dL/g and 0.8 dL/g;
• and
• a biodegradable resin material, wherein the biodegradable resin material includes polybutylene succinate (PBS), polybutylene adipate terephthalate (PBAT), and polycaprolactone (PCL);
• wherein the biodegradable resin material has a second intrinsic viscosity of between 0.9 dL/g and 1.1 dL/g;
• wherein, in the biodegradable additive, a weight ratio among polyethylene terephthalate (PET), polybutylene succinate (PBS), polycaprolactone (PCL), and polybutylene adipate terephthalate (PBAT) is 61:14:17:8;
• wherein a content of the biodegradable additive added into the polyester resin matrix is 2 wt % or 5 wt %.