UNILINK 4100

Product Details

Unilink 4100 is a liquid aromatic diamine developed as a slow-reacting chain extender for TDI and MDI-based polyurethane elastomers. As a di-functional diamine, Unilink 4100 builds linear polymer networks, allowing the polyurethane formulator to control the degree of crosslinking by the use of higher functional isocyanates and polyols. Very high hardness elastomers (80 Shore D) and some very soft polymers (25 Shore A) with a unique range of strength properties can be prepared.

Unilink 4100 is specially recommended for ambient temperature cured MDI-based coatings to provide long pot life, good adhesion and excellent physical properties.

Unilink 4100 can be incorporated in PUR and PIR rigid foam formulations to provide improved dimensional stability, flow and adhesion. Used alone or blended with Unilink 4200, it can be a cost effective solution for dimensional stability problems.

Features

• Low cost amine chain extender.
• Longer pot lives.
• Low toxicity - Ames negative.
• Improved flow and adhesion.
• Low moisture sensitivity.
• Amine-cured MDI pre-polymers.
• Compatible with a wide range of polyols, co-curatives and all other polyurethane chemicals.
• Very high hardness elastomers.
• Room temperature curable systems.

Typical Applications

Rigid Foam

PUR & PIR Foam

Rigid polyurethane foam blown with CFCs, HCFCs, HCs with or without water, and all-water blown foams can benefit from the use of Unilink 4100. Blends of Unilink 4100 and Unilink 4200 can provide improvements in compressive strength and dimensional stability at reduced cost, although not as effectively as Unilink 4200 diamine when used alone.

CASE

Coatings

Unilink 4100 is specially recommended for the cure of MDI-based coating compounds at ambient temperature. Many high performance systems have been developed for application by spray or pour-and-spread techniques. Polymers systems containing Unilink 4100 show improved adhesion and better surface finish.

Adhesives

Uncured systems containing Unilink 4100 consistently show lower surface tension while cured polymers have higher strength properties due to the additional urea groups from the reaction with isocyanate. These properties combine to improve the overall performance of the adhesive.

Hard Elastomers

Unilink 4100 can be used to cure MDI-based quasi-pre-polymers to produce a range of very hard and very tough elastomers for automotive and civil engineering applications.

Soft Elastomers

Cure with Unilink 4100 can produce very long pot lives and very soft polymers that are ideally suited as industrial sealants.