Technological watch

Disclosed is a preparation method for a bio-based nylon 5X fiber material. The method comprises the following steps: 1) mixing a 1,5-pentanediamine mixed fermentation liquid and a dibasic acid for a polymerization reaction, obtaining a nylon salt mixed liquid, and processing same to obtain a nylon salt, the 1,5-pentanediamine mixed fermentation liquid being a mixed fermentation liquid obtained by means of the biological preparation of 1,5-pentanediamine; 2) performing a polymerization reaction on an aqueous solution of the nylon salt and a molecular weight regulating agent, and obtaining a nylon 5X polymer; and 3) by means of a spinneret, spraying a melt of the nylon 5X polymer to obtain a thin stream of the melt, the thin stream of melt is then cooled and solidified into filaments, and the solidified filaments are subjected to a fiber post-processing process to obtain a bio-based nylon 5X fiber material. The present invention can directly obtain nylon salt by means of adding a dibasic acid to a 1,5-pentanediamine mixed fermentation liquid, can increase the conversion rate, reduce energy consumption, and prevent environmental pollution. The nylon salt mixed liquid is purified to obtain a nylon salt crystal for subsequent reaction, thereby preventing side reactions.