Developed by: Marjan Polymer Industries. Pakistan
Project In-charge: Dr. Muhammad Abid
Collaborators: Prof. Dr. Tahir Jamil (late), Prof Dr. Khan, Dr. Nafisa
Polyurethanes belongs to class of alternating segmented polymers which comprises mainly two alternative segments such as soft and hard segments. The Polyurethane dispersions were made by dispersing amphiphilic pre-polymers using soft segment (polyol), hard segment (diisocyanates), and internal emulsifier followed by chain extension steps.
Adopted Synthesis Process
The pre-polymer process. This technique is used to produce polyurethane coatings, elastomers and sealants.
2 OCN–R–NCO + HO ~~~~~~~~~ OH
OCN–R–NHCOO ~~~~~~~~~~ OCONH–R–NCO
This pre-polymer having free NCO terminals which further reacts with chain extenders and the resulting polymer (polyurethane) formed is a high molecular weight polyurethane.
OCONHRNHCOO ~~~~~~~~~~~~OCONHRNCO + HO–R1–OH
O–R1–O [CONHRNHCOO ~~~~~~~~~~~ OCONHRNHCOO–R1–O]n
- Transparent Coating
- High Hardness
- Excellent UV Protection
- Excellent Impact Resistance
- Excellent Chemical Resistance
- High Gloss
- Good Scratch Resistance
- Good Rheological Flow
- Excellent Colloidal Stability