The aliphatic isocyanate (ADI) industry has high entry barriers and Wanhua Chemical is a leading domestic company
Aliphatic isocyanate (ADI) refers to isocyanate products other than aromatic. ADI molecules have -N=C=O functional groups. Polyurethane materials prepared with ADI have good anti-aging, high temperatu…
Yinguang Group successfully trial-produced ton-level PDI qualified products and accelerated the localization of bio-based isocyanate
Equipment instrument maintenance, process technology improvement, test plan optimization… After a short overhaul, employees of the PDI Research Institute of Juyin Company of Yinguang Group are c…
Reaction of polyurethane isocyanate and hydroxyl group
The reaction product of isocyanate group and hydroxyl group is urethane. Studies have shown that the reaction between isocyanate and hydroxyl is a second-order reaction, and the reaction rate constant…
Reaction of polyurethane isocyanate with water
German chemist A.Wurtz believes that isocyanate reacts with water to first generate unstable carbamic acid, which is then decomposed into carbon dioxide and amines. In the presence of excess isocyanat…
Reaction of polyurethane isocyanate and amino groups
The reaction between amino groups (primary amino groups and secondary amino groups) and isocyanate is one of the more important reactions in the preparation of polyurethane. Isocyanates react with ami…
Polyurethane isocyanate reacts with urethane and urea groups
Carbamate and urea groups still contain activity Hydrogen can continue to react with isocyanate groups to form cross-linking bonds. The activity of urethane group and urea group is lower than that of …
Self-addition polymerization of polyurethane isocyanate
Isocyanates can undergo self-addition reactions to generate various Autopolymers include dimers, trimers and various multimers, the most important of which are dimerization and trimerization. 1. Dimer…
Self-polycondensation reaction of polyurethane isocyanate
——Carbodiimide Under organic phosphine catalyst and heating conditions, isocyanate can undergo self-condensation polymerization reaction. Compounds containing carbodiimino groups (—NCN—) are generated…
Chinese