Energy savings plus mechanical reinforcement and rheology control

1K Moisture Curing Silane End-Capped Polyurethane Sealant by Evonik

Adhesives Formulation | Supplied by Evonik

Applicable Type

Sealants

Applicable Base Polymer

Polyurethanes

Applicable Industrial Sectors

Buildings & constructions , Industrial 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 silane end-capped prepolymers offer fast room temperature cure and good durability. Silane end-capped polyurethanes 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

Silane end-capped polyurethane (Polymer ST 77 from Evonik )

Plasticizer: Elatur CH from Evonik (1,2-Cyclohexanedicarboxylic acid, 1,2-diisononyl ester)

xxxx

Filler: precipitated calcium carbonate (0.07µm)

xxxx

Aminosilane adhesion promoter (Dynasylan 1146, Evonik)

xxx

Drying agent (Dynasylan VTMO, Evonik)

xxx

Catalyst: di-octyl-di-acetonate

xxxx

Other additives: antioxidants, thixotropic fillers, pigments, etc.

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Typical Properties

Properties

Excellent primerless adhesion to glass, aluminum, and other metals

Unusually good adhesion to plastics

Fast, bubble free cure

Excellent durability and joint movement

Good tensile strength and elasticity

Excellent solvent resistance

Immediate paintability

Isocyanate-free urethane performance

Processing

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Resulting Properties

Silane end-capped polyurethane resins are used 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 a generic starting formulation.