Pazasi ndiko kugadzirwa kwePapi .
Papi (crude mdi) inogadzirwa nenzira imwecheteyo seyeMdio yehuwandu hweAnline kune hydrochloric acid (("}} lewis acid, uyezve polyamine compound inoiswa pasi pePhosgenation yekuita Papio {} Pfungwa {6]} mamiriro ekuvhiya ePolyamine Synthesis akafanana neyeMwana {} polyamine anofanirwa kuve akaiswa polyamine, uye kiyi yetilumine. Aniline / formaldehyde chinhu ndi 4/1 . 4, iyo yakashongedzwa polyamine ine inenge 75% ye diamine compound. Kazhinji, maitiro ekubatana kweMDI uye Papi anotorwa.