Method for synthesizing long carbon chain semi-aromatic nylon

US11905370B2 · kind B2 · utility

Assignee

• CHANGZHOU UNIVERSITY · CN

Inventors

• Minying Liu · Zhengzhou, CN
• Bingfeng Xue · Zhengzhou, CN
• Peng-Fei Fu · Midland, US
• Zhe Cui · Irvine, US
• Xiaomeng Zhang · Lo Wu, CN
• Wei Zhao · Beijing, CN
• Xinchang Pang · Ames, US
• Qingxiang ZHAO · Zhengzhou, CN

Key dates

• Filing date: Sep 17, 2021
• Grant date: Feb 20, 2024
• Expiry date: May 17, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L77/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The disclosure relates to a synthesis method of long carbon chain semi-aromatic nylon. The synthesis method comprises the following steps: mixing a wet powdery nylon salt, an antioxidant, a catalyst, a surfactant and pellets, and carrying out a one-step solid state polymerization under dynamic mixing to obtain a powdery nylon; under dynamic mixing, enabling the pellets to promote the stirring and mixing of the material and reducing material adhesion to the wall; the one-step solid state polymerization comprises a pre-solid state polymerization and a post-solid state polymerization; in the pre-solid state polymerization, ensuring the nylon salt and the prepolymer not to be molten; in the post-solid state polymerization, gradually reducing the system pressure to vacuum, and keeping the system pressure in vacuum state for at least 1 hour; the temperature of the post-solid state polymerization is not lower than the termination temperature of the pre-solid state polymerization.