Energy savings plus mechanical reinforcement and rheology control

1K Chemically Blocked Polyurethane Sealant for Windshields

Adhesives Formulation

Applicable Type

Reactive Adhesives

Applicable Base Polymer

Polyurethanes

Applicable Industrial Sectors

Buildings & constructions , Transportation (excl. Automotive)

Applicable Base Polymer Properties

The main obstacle with one component (1K) polyurethane systems is to provide a fast cure mechanism while maintaining long shelf life. To overcome this problem, formulators typically have turned to chemically blocked systems that unblock to become active when exposed to an external influence such as moisture or heat. These long shelf-life 1K polyurethane systems do not have the carefully controlled mixing ratio requirements or the pot life concerns of 2K systems. The ketimine in the above formulations is a chemically blocked diamine.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Blocked Isocyanate terminated polyurethane

xxxxx

Thixotropic agent (THIXCIN® R, Elementis)

xxxx

Filler (calcium stearate coated calcium carbonate) 42.5

xxxx

Colorant

xxx

Aminopropyltriethoxysilane

xxx

Methyltrimethoxysilane

xxx

Methanol

xxxx

Processing oil (Sunthene 311, Sun Oil Company)

xxx

Tricresyl phosphate

xxxx

Ketimine

xxx

Processing

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Resulting Properties

'Blocked' urethane adhesives are termed 'blocked' by virtue of the fact that one of the key reactants is chemically blocked to prevent reaction. Sealants or adhesive compositions of this formulation are moisture curable compositions that adhere tenaciously to a wide variety of surfaces, form tack-free surfaces after being exposed to the atmosphere for only a short period of time, and form a cure within a matter of hours after being applied.

The sealant showed excellent stability upon being stored in sealed containers. The sealant will not deteriorate after being stored for six months at 25° C in an atmosphere having a relative humidity of 50%.
Shore A hardness of 31 after being exposed for 3 weeks to a 50 percent relative humidity atmosphere at 25°C
Fast moisture curable composition

1K Chemically Blocked Polyurethane Sealant for Windshields

Applicable Base Polymer Properties

Typical Formulation Ingredients

Processing

Resulting Properties

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