High-strength activated polyester industry yarn and preparation method thereof

The invention relates to a high-strength activated polyester industry yarn and a preparation method thereof. The high-strength activated polyester industry yarn is a modified polyester industry yarn of which the surface is coated with an activating agent and the high-strength activated polyester industry yarn is prepared from modified polyesters through spinning; the modified polyester is composed of polyester and aminoadipic acid gylcol ester, hydrogen-bond interaction exists between the aminoadipic acid gylcol ester and the molecular chains of the polyester, and the relative position of the aminoadipic acid gylcol ester and the molecular chains of the polyester is fixed; the free volume of the fiber is increased when the high-strength activated polyester industry yarn is at 70-80 DEG C, a part of activating agent molecules are dispersed into fiber gaps, more -OHs and -NHs with strong activity are introduced into the polyester molecules, a firm resinoid coating is formed on the surface of a polyester cord thread and the reactivity of the polyester fiber is improved; and the high-strength activated polyester industry yarn can be applied to triangular belt cords, radial tire cord fabrics and the like.