Method for green synthesis of uniform- and large-particle-size polystyrene particles

US10604599B2 · kind B2 · utility

Assignees

• Nanjing University · CN
• NANJING UNIVERSITY & YANCHENG ACADEMY OF ENVIRONMENTAL PROTECTION TECHNOLOGY AND ENGINEERING · CN

Inventors

• Chendong Shuang · Nanjing, CN
• Weiwei Zhou · Nanjing, CN
• Yunshu Wang · Nanjing, CN
• Aimin Li · Nanjing, CN
• Qimeng Li · Nanjing, CN
• Lili Liu · Beijing, CN
• Wei Wang · Beijing, CN
• Yi Zhang · Hopkinton, US

Key dates

• Filing date: May 29, 2018
• Grant date: Mar 31, 2020
• Expiry date: Oct 30, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F2500/24
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method for green synthesis of uniform- and large-particle-size polystyrene particles, comprising steps of: prepolymerizing styrene at 70□ to 75□ for 1 h to 6 h in advance while stirring, adding divinylbenzene dissolved with initiators to the styrene, and stirring for 10 min to 30 min to obtain oil phase; heating lactic acid or an aqueous solution of lactic acid to 70□ to 80□, adding the oil phase to dispersed phase by a constant-pressure device, maintaining the temperature for 2 h, heating to 80±5□ and then maintaining the temperature for 1 h, and heating to 85±5□ and then maintaining the temperature for 3 h to 6 h, to obtain polystyrene particles with a uniform particle size ranging from 0.7 mm to 2.0 mm.