The invention relates to a lightweight warmth retention
fiber and a preparation method thereof.
Polyester melts are metered, extruded by a composite spinneret plate, cooled, coated with oil, stretched, thermoformed and wound to prepare the lightweight warmth retention
fiber, a hollow spinneret hole and a circular spinneret hole are formed in the composite spinneret plate, the ratio of the hollow spinneret hole to the micro-hole length of the circular spinneret hole is equal to the product of the equivalent
diameter ratio of the hollow spinneret hole to the circular spinneret hole and a coefficient K, the equivalent
diameter is the ratio of cross-sectional areas of the spinneret holes to cross-sectional area perimeters, value range of the coefficient K is 0.7-1.03, an oil agent for oiling contains
crown ether, the content of the
crown ether is 67.30-85.58wt%, the heat
conductivity coefficient of a knitting fabric prepared from the prepared lightweight warmth retention
fiber is smaller than or equal to 0.150W / m*K, and the weight of the knitting fabric is 100g / m<2>. The method is simple and reasonable, and the prepared fiber has good lightweight warmth retention,
moisture absorption and sweat-releasing performances and has excellent popularization values.