US 12,434,211 B2
Efficient and cost-effective method for preparing ultra-fine powdered natural rubber masterbatch with high graphene content and use thereof
Yaqing Liu, Taiyuan (CN); Guizhe Zhao, Taiyuan (CN); and Xu Li, Taiyuan (CN)
Assigned to NORTH UNIVERSITY OF CHINA, Taiyuan (CN); and SHANXI ZHONGBEI NEW MATERIAL TECHNOLOGY CO., LTD., Taiyuan (CN)
Filed by NORTH UNIVERSITY OF CHINA, Taiyuan (CN); and SHANXI ZHONGBEI NEW MATERIAL TECHNOLOGY CO., LTD., Taiyuan (CN)
Filed on Jun. 1, 2023, as Appl. No. 18/327,801.
Application 18/327,801 is a continuation of application No. PCT/CN2023/088597, filed on Apr. 17, 2023.
Claims priority of application No. 202310300813.1 (CN), filed on Mar. 27, 2023.
Prior Publication US 2023/0321620 A1, Oct. 12, 2023
Int. Cl. B01J 2/06 (2006.01)
CPC B01J 2/06 (2013.01) 10 Claims
 
1. A method for preparing a graphene-containing ultra-fine powdered natural rubber masterbatch, comprising:
(1) adding deionized water to a graphene oxide dispersion, followed by an ultrasonic dispersion, adding of an anionic surfactant and mechanical stirring to obtain a modified graphene oxide dispersion;
(2) adding deionized water to a natural rubber latex, followed by a uniform mixing to obtain a latex suspension; slowly adding the latex suspension to the modified graphene oxide dispersion under a mechanical stirring followed by mixing under stirring to obtain a mixed emulsion; and
(3) feeding the mixed emulsion into a spray dryer through a feeding pump, followed by spray drying to obtain the graphene-containing ultra-fine powdered natural rubber masterbatch with a particle size of less than 5 μm.