Energy savings plus mechanical reinforcement and rheology control

1K Moisture Curing Silane Modified Polyurethane Sealant by Momentive Specialty Polymers

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

Silyl-modified Polymers (SMP)

Applicable Industrial Sectors

Buildings & constructions

Applicable Base Polymer Properties

Silane-terminated polyurethanes have become increasingly attractive to manufacturers of adhesives, sealants and coatings. This high-performance hybrid technology is a result of the synergy between the silane-curing mechanism and polyurethane backbone properties. Formulations based on SPUR+ prepolymers offer fast room temperature cure and good durability: the sealants or adhesives are free of unreacted isocyanate, making for products that are less harmful to the environment. Benefits also include freedom from bubbling during cure and a broadening of the formulation latitude compared to conventional polyurethane technologies. SPUR+ prepolymers allow the formulator the use of a wide variety of additives and adhesion promoters to meet performance needs.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Polyurethane prepolymer (SPUR+, Momentive)

xxx

Plasticizer (DIDP)

xxx

Moisture scavenger (Silquest A-171 silane)

Filler – calcium carbonate fine

xxx

Filler – calcium carbonate coarse

xxx

UV stabilizer

xxx

Thixotropic agent (SiO2)

Colorant (e.g., TiO2)

xxx

Adhesion promoter (Silquest A-Link 15 silane, Momentive)

xxxx

Catalyst (Formez SUL-11A, Momentive)

xxx

Typical Properties

Properties

Tensile strength at break, MPa

xxxx

Modulus at 100% extension, MPa

xxxx

Elongation at break, %

xxx

Hardness, Shore A

Cured 2 weeks at 23°C, 60% RH

Processing

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Resulting Properties

SPUR+ prepolymer is a silylated polyurethane resin for manufacturing one-part, moisture-curing sealants and adhesives. Plasticizer-free and of relatively low viscosity, SPUR+ is an excellent base resin for low modulus sealants in building and construction applications where good elastic recovery is required. The table above provides the resulting physical properties of a SPUR based sealant. The properties are measured after curing for two weeks at 23°C and 60% RH.

The source of 1K Moisture Curing Silane Modified Polyurethane Sealant is Momentive Specialty Polymers.

Tips and Tricks

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