Polyurethane -

R−NCO+R′−OH→R−NH−CO−O−R′cap R minus NCO plus cap R prime minus OH right arrow cap R minus NH minus CO minus O minus cap R prime

Rigid foams serve as high-performance thermal insulation for roofs and walls, significantly reducing energy consumption. Polyurethane

Long, flexible polyol chains that provide elasticity and low-temperature flexibility. significantly reducing energy consumption. Long

Formed by the reaction of isocyanates and chain extenders (small diols/diamines), providing mechanical strength, rigidity, and high-temperature performance. providing mechanical strength

Used in seating for comfort, bumpers for impact resistance, and coatings for corrosion protection and aesthetics.

Organic compounds containing at least two isocyanate groups ( Polyols: Alcohols containing at least two hydroxyl groups ( −OHnegative OH Reaction Mechanism The general reaction forming the urethane bond is: