Flat acrylic fiber and preparation method thereof

The invention relates to the technical field of textile fibers, and particularly discloses a flat acrylic fiber and a preparation method thereof. The invention provides a preparation method of flat acrylic fibers. The preparation method comprises the following steps of spinning forming, water washing traction, oiling, drying, curling and shaping. Oiling: applying a flat acrylic fiber oiling agent to the tows subjected to water washing and traction, wherein the addition amount of the flat acrylic fiber oiling agent is 0.45-1% of the total weight of the tows; based on the total weight of the flat acrylic fiber oiling agent being 100%, the flat acrylic fiber oiling agent comprises the following components: 20-30% of trihydroxyethyl methyl quaternary ammonium methyl sulfate, 28-35% of fatty acid polyoxyethylene ester, 20-35% of polyethylene glycol stearate, 3-8% of fluorine-containing alkyl phosphate salt and the balance of water. The flat acrylic fiber obtained through the preparation method of the flat acrylic