公开(公告)号：EP4219583A1

公开(公告)日：2023-08-02

申请号：EP20963839.4

申请日：2020-12-01

申请人： Wanhua Chemical Group Co., Ltd ,  Wanhua Chemical (Ningbo) Co., Ltd

发明人： YU, Yong ,  CUI, Xuelei ,  GUO, Yaoyun ,  SHANG, Yonghua ,  HAN, Jinping ,  LI, WenBin ,  LIU, Degang ,  LI, Yuan

IPC分类号： C08G18/73 ,  C08G18/75 ,  C08G18/66 ,  C08G18/48 ,  C08G18/10 ,  C08G18/32

摘要： A polyisocyanate composition, a preparation method therefor and an application thereof. The value of the mass content of alkaline hydrolyzed chlorine minus the mass content of water hydrolyzed chlorine in the polyisocyanate composition is 0.1 ppm-100 ppm. The mass content of the alkaline hydrolyzed chlorine is the mass content obtained by calculating halogen dissociated under alkaline conditions and/or halogen dissociated under a temperature condition of 100°C or more as the relative atomic mass of a chlorine atom. In the polyisocyanate composition containing a specific amount of alkaline hydrolyzed chlorine, when a reaction locally becomes out of control causing causes a local severe exotherm, chlorine in alkaline hydrolyzed chlorine will be dissociated and be toxic to catalysts, thereby reducing the reactivity in local overreactive areas to thereby avoid the turbidity of a polyurethane synthetic emulsion, such that the light transmittance and yellowing resistance of polyurethane products are further improved.

公开(公告)号：EP3901133A1

公开(公告)日：2021-10-27

申请号：EP18943672.8

申请日：2018-12-25

申请人： Wanhua Chemical Group Co., Ltd.

发明人： YU, Yong ,  SHANG, Yonghua ,  ZHAO, Lei ,  LI, Wenbin ,  SUN, Ye ,  HE, Wei ,  CUI, Xuelei ,  WANG, Jingxu ,  LIU, Degang ,  LI, Yuan

IPC分类号： C07C263/10 ,  C07C265/14

摘要： Disclosed is a method for preparing isophorone diisocyanate. The method comprises the following steps: (1) reacting isophorone with hydrogen cyanide in the presence of a catalyst to obtain isophorone nitrile; (2) reacting the isophorone nitrile obtained in step (1) with ammonia gas and hydrogen in the presence of a catalyst to obtain isophorone diamine; and (3) subjecting the isophorone diamine to a phosgenation reaction to obtain the isophorone diisocyanate, wherein the content of impurities containing a secondary amine group in the isophorone diamine that undergoes the phosgenation reaction in step (3) is ≤ 0.5 wt%, preferably ≤, 0.3 wt%, and further preferably ≤ 0.1 wt%. By means of the method of the present invention, the content of hydrolyzed chlorine in the isophorone diisocyanate product can be effectively reduced, the yellowing resistance of the product is effectively improved, and the harm of causing an unqualified downstream article due to the presence of the hydrolyzed chlorine in the product is also reduced.