公开(公告)号：US20230303736A1

公开(公告)日：2023-09-28

申请号：US18080161

申请日：2022-12-13

申请人： Qingdao University of Science & Technology

发明人： Feng Wang ,  Xuequan Zhang ,  Heng Liu ,  Chunyu Zhang

IPC分类号： C08F210/12 ,  C08F2/06 ,  C08F2/60 ,  C08F4/54

CPC分类号： C08F210/12 ,  C08F2/06 ,  C08F2/60 ,  C08F4/545

摘要： The present disclosure provides a preparation method of a homogeneous rare earth catalyst. In the present disclosure, a depolymerizing agent is introduced into the homogeneous rare earth catalyst to promote complete depolymerization of an alkyl aluminum trimer into monomolecular alkyl aluminum. As a result, there is an increase in the number of the alkyl aluminum which serves as an effective chain transfer agent, resulting in a greatly improved chain transfer rate, such that a polymerization system has completed the chain transfer in an early stage of the reaction. Accordingly, an aluminum terminal molecular chain has an increased concentration, leading to an accelerated exchange with an active center propagating chain and a decreased influence caused by an increased viscosity of the system, maintaining living polymerization of the system.

公开(公告)号：US11987660B2

公开(公告)日：2024-05-21

申请号：US18080175

申请日：2022-12-13

申请人： Qingdao University of Science & Technology

发明人： Chunyu Zhang ,  Lihua Na ,  Qi Yang ,  Heng Liu ,  Xuequan Zhang

IPC分类号： C08F4/70 ,  C08F4/04 ,  C08F4/602 ,  C08F36/06 ,  C08F136/06

CPC分类号： C08F4/70 ,  C08F4/04 ,  C08F4/602 ,  C08F36/06 ,  C08F136/06

摘要： The present disclosure relates to the technical field of preparation of syndiotactic 1,2-polybutadiene (s-PB), in particular to a catalytic system and use thereof, and a preparation method of s-PB. In the present disclosure, the catalytic system includes an iron-containing organic compound, an azodicyano compound, an organoaluminum compound, and a free radical scavenger; where an iron element in the iron-containing organic compound, the azodicyano compound, the organoaluminum compound, and the free radical scavenger have a molar ratio of 1:(0.5-10):(5-100):(1-1000); and the free radical scavenger is selected from the group consisting of a sterically hindered phenol, a sterically hindered amine, and a phosphorus-containing antioxidant. The catalytic system can prepare the s-PB with a high activity at a high temperature, and the s-PB has a melting point of 60° C. to 130° C. with an extremely low gel content or even no gelation.

公开(公告)号：US20230192912A1

公开(公告)日：2023-06-22

申请号：US18080175

申请日：2022-12-13

申请人： Qingdao University of Science & Technology

发明人： Chunyu Zhang ,  Lihua Na ,  Qi Yang ,  Heng Liu ,  Xuequan Zhang

IPC分类号： C08F4/70 ,  C08F4/04 ,  C08F4/602 ,  C08F36/06 ,  C08F136/06

CPC分类号： C08F4/70 ,  C08F4/04 ,  C08F4/602 ,  C08F36/06 ,  C08F136/06

摘要： The present disclosure relates to the technical field of preparation of syndiotactic 1,2-polybutadiene (s-PB), in particular to a catalytic system and use thereof, and a preparation method of s-PB. In the present disclosure, the catalytic system includes an iron-containing organic compound, an azodicyano compound, an organoaluminum compound, and a free radical scavenger; where an iron element in the iron-containing organic compound, the azodicyano compound, the organoaluminum compound, and the free radical scavenger have a molar ratio of 1:(0.5-10):(5-100):(1-1000); and the free radical scavenger is selected from the group consisting of a sterically hindered phenol, a sterically hindered amine, and a phosphorus-containing antioxidant. The catalytic system can prepare the s-PB with a high activity at a high temperature, and the s-PB has a melting point of 60° C. to 130° C. with an extremely low gel content or even no gelation.