-
公开(公告)号：EP3904336A1
公开(公告)日：2021-11-03
申请号：EP18944569.5
申请日：2018-12-26
发明人： HUA, Weiqi , LI, Tonghe , SHANG, Yonghua , SUN, Shuchang , WANG, Jingxu , HAN, Jinping , LI, Qiang , LI, Wenbin , LI, Jing , WANG, Pengfei , LI, Yuan
IPC分类号： C07C263/10 , C07C265/00
摘要： Disclosed is a method for preparing an isocyanate in a gaseous phase, comprising feeding, in the presence or absence of an inert gas, an amine-containing gas stream and a phosgene-containing gas stream into a reaction region, allowing the amine and the phosgene to contact in gaseous forms and undergo a phosgenation reaction in the reaction region, thus preparing the target isocyanate in a gaseous form in the reaction region. The phosgene-containing stream is subjected to preheating and warming before being fed into the reaction region, and the phosgene-containing stream comprises a substance A at a mass fraction of
-
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
发明人： YU, Yong , CUI, Xuelei , GUO, Yaoyun , SHANG, Yonghua , HAN, Jinping , LI, WenBin , LIU, Degang , LI, Yuan
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.
-
搜索结果
2 条记录 (耗时 0.013 秒)
