Isophorone diisocyanate → Isocyanate

Participants

Reaction Steps

Then, 222 parts of isophorone diisocyanate was dissolved in 62 parts of methyl isobutyl ketone, and 87 parts of methyl ethyl ketoxime was added dropwise at 30° C. to obtain half-blocked isophorone diisocyanate having an isocyanate value of 136. 76 Parts of 1,2-propylene glycol was added to it, and the mixture was heated to 120° C. and maintained for 4 hours. After its isocyanate value reached 0, 313 parts of the half-blocked tolylene diisocyanate was added. The mixure was maintained at 120° C. for 5 hours, and it was determined that its isocyanate value reached 0. As a result, a curing agent having a solids content of 85% was obtained in which the blocking agents had a dissociation temperature in the presence of a catalsyt of about 100° C. and about 140° C.

Provenance & Evidence