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15 条记录 (耗时 0.014 秒)

    Method for preparation of a polyester
    1.
    发明授权
    Method for preparation of a polyester 有权

    公开(公告)号：US11015021B2

    公开(公告)日：2021-05-25

    申请号：US16607645

    申请日：2018-04-24

    申请人： NANJING TECH UNIVERSITY

    发明人： Kai Guo ,  Fulan Wei ,  Zhenjiang Li ,  Hui Zhu ,  Siming Chen ,  Yu Gao

    IPC分类号： C08G63/82 ,  C08G63/08 ,  C08G63/42

    摘要： Disclosed in the present invention is a preparation method for a polyester, relating to the technical field of organic catalysis and polymeric materials. The preparation method in the present invention comprises: (1) using pyridine and saccharin in a ratio of 1:1 to prepare pyridine saccharin salt in tetrahydrofuran at 60° C. and separating the pyridine saccharin salt out in methanol and hexane. (2) Freeing out a small amount of pyridine from the pyridine saccharin salt in a heating state, catalyzing by the pyridine saccharin salt and pyridine a cyclic lactone or a carbonate to be ring-opened and polymerized to form the polyester; and the system has no other compound residues. (3) In the presence of an alcohol initiator, catalyzing by the pyridine saccharin salt the cyclic lactone to be ring-opened and polymerized to obtain the polyester. The catalytic system can efficiently synthesize a specific polylactone. Compared with a method for synthesizing a polyester by the use of a metal-containing catalyst in the prior art, the system has wide application. Moreover, the system is advantageous of no metal residue, narrow molecular weight distribution and no chain transesterification, and therefore has great commercial application potential in bio-pharmaceutical field and microelectronic field.

    Polyols for preparing flexible polyurethane foam, and preparation method and application thereof
    4.
    发明授权
    Polyols for preparing flexible polyurethane foam, and preparation method and application thereof 有权

    公开(公告)号：US11214584B2

    公开(公告)日：2022-01-04

    申请号：US17108957

    申请日：2020-12-01

    申请人： NANJING TECH UNIVERSITY

    发明人： Kai Guo ,  Zheng Fang ,  Wei He ,  Ning Zhu ,  Xin Hu ,  Jiangkai Qiu ,  Chengkou Liu ,  Jingjing Meng ,  Jindian Duan ,  Pingkai Ouyang

    IPC分类号： C07F9/09 ,  C08G18/76 ,  C08G18/67 ,  C08G18/48

    摘要： It discloses a polyether polyols for preparing flexible polyurethane foam, and a preparation method and application thereof. The method comprises the following steps: (1) carrying out a reaction on phosphorus oxychloride, epichlorohydrin, a first acidic catalyst and an inert solvent in a first microchannel reactor to obtain a chloroalkoxy phosphorus compound; (2) carrying out a reaction on the chloroalkoxy phosphorus compound, glycidol, a second acidic catalyst and an inert solvent in a second microchannel reactor to obtain a hydroxy compound; (3) carrying out a ring-opening reaction on the hydroxy compound, epoxy vegetable oil, a basic catalyst and an inert solvent in a third microchannel reactor to obtain a vegetable oil polyol; and (4) carrying out an addition polymerization reaction on the vegetable oil polyol, propylene oxide and an inert solvent in a fourth microchannel reactor to obtain the polyether polyols for preparing flexible polyurethane foam.

    Method for one-step synthesis of functional polyesters by organic catalysis
    5.
    发明授权
    Method for one-step synthesis of functional polyesters by organic catalysis 有权

    公开(公告)号：US10040898B2

    公开(公告)日：2018-08-07

    申请号：US15365351

    申请日：2016-11-30

    申请人： NANJING TECH UNIVERSITY

    发明人： Kai Guo ,  Yihuan Liu ,  Ning Zhu ,  Xin Hu ,  Zheng Fang ,  Weiyang Feng ,  Weijun Huang

    IPC分类号： C08G63/08 ,  C08G63/82 ,  C08G63/90 ,  C08G63/688

    摘要： It relates to the field of synthetic macromolecular chemistry, and discloses a method for one-step synthesis of thiol-functionalized polyester polyols by organic catalysis. This method uses lactone monomer as reaction raw material, thiol-alcohol as initiator, and diphenyl phosphate as organic catalyst to catalyze and synthesize the thiol-functionalized polyester polyols. The present invention provides a method which is simple, inexpensive, easily controllable and environmentally friendly to prepare thiol-functionalized polyester polyols with the easily available and controllable catalyst. The method can selectively catalyze the ring opening polymerization of lactone to prepare thiol-functionalized polyester polyols using the organic catalyst.

    Method for preparing caprolactam by using a microreactor under lewis acid catalysis
    8.
    发明授权
    Method for preparing caprolactam by using a microreactor under lewis acid catalysis 有权

    公开(公告)号：US09624176B2

    公开(公告)日：2017-04-18

    申请号：US15192869

    申请日：2016-06-24

    申请人： NANJING TECH UNIVERSITY (CN)

    发明人： Kai Guo ,  Xin Li ,  Zheng Fang ,  Kai Zhang ,  Qi Yu ,  Pingkai Ouyang

    IPC分类号： C07D201/04 ,  C07D201/06 ,  C07D223/10

    CPC分类号： C07D223/10 ,  Y02P20/52

    摘要： A method for preparing caprolactam by using a microreactor under Lewis acid catalysis, wherein a hydroxyl group in a cyclohexanone oxime is activated to obtain a cyclohexanone oxime sulfonates intermediate, then rearranged under Lewis acid catalysis to prepare the caprolactam. The method of this invention has a simple process and a high operation safety and selectivity, the reaction condition is mild, an efficient reaction can take place even at room temperature, the reaction time is short, the conversion of the cyclohexanone oxime can reach 100% within a short time, the selectivity of the caprolactam can reach 99%, the energy consumption is greatly reduced in the premise of maintaining a high yield, and the production cost is reduced, being an efficient and green and environmentally friendly method of for synthesizing the caprolactam.