Energy savings plus mechanical reinforcement and rheology control

1K Moisture Curing Silane Modified Polyurethane Sealant (B)

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

PU-Prepolymers

Applicable Industrial Sectors

Buildings & constructions , Structural assembly , Transportation (excl. Automotive)

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

Ingredient

Parts by weight

SPUR 1015LM prepolymer (Momentive)

xxxx

Plasticizer (DIDP)

xxxx

Moisture scavenger (Silquest A-171 silane)

xxx

Filler – calcium carbonate

xxxx

UV stabilizer

xxx

Thixotropic agent (SiO2)

xxx

Colorant (e.g., TiO2)

xxx

Adhesion promoter (Silquest A-1110 silane)

xxxx

Catalyst (dibutyl tin)

xxxx

(Source: Momentive Specialty Polymers)

Typical Properties

Properties

Tensile strength at break, N/mm2

xxxx

Modulus at 100% extension, N/mm2

xxxx

Elongation at break, %

xxxx

Hardness, Shore A

Tack free time, hrs

Cured 2 weeks at 23°C, 60% RH

Processing

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Resulting Properties

SPUR + 1015LM prepolymer is a silylated polyurethane resin for manufacturing one-part, moisture-curing sealants and adhesives. Plasticizer-free and of relatively low viscosity, it is an excellent base resin for low modulus sealants in building and construction applications where good elastic recovery is required. The table above provides two generic formulations and the resulting physical properties of SPUR based sealants. The properties are measured after curing for two weeks at 23°C and 60% RH.

Tips and Tricks

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