Energy savings plus mechanical reinforcement and rheology control

Plasticized One-part Polysulfide Sealant by Evonik

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

Polysulfides

Applicable Industrial Sectors

Buildings & constructions , Industrial Assembly , Transportation (excl. Automotive)

Applicable Base Polymer Properties

Liquid polysulfide polymers are normally associated with sealants for construction, marine, insulating glass, automotive, and aircraft industries. The predominant product is the mercaptan-terminated liquid polymer (LP) that contains approximately 37 percent bound sulfur. It is the high concentration of sulfur linkages that provides these products with their unique chemical properties. The liquid polysulfide polymer can be transformed from a liquid state into a solid elastomer, even at low temperatures.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Polysulfide polymer (Thiokol LP 32, Toray)

xxxx

Plasticizer

xxxx

Adhesive resin (e.g., epoxy resin)

xxx

Fillers

xxxx

Drying agent (BaO)

xxx

Calcium peroxide

xxx

Plasticizer

xxx

Fumed silica (Aerosil R 202, Evonik)

xxx

Processing

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Resulting Properties

Polysulfide adhesives and sealants are formulated using base polymer, curing agents, reinforcing fillers, plasticizers, and adhesion additives. Compounded products are significantly different because various curing systems and application properties are designed into the products to meet the needs of the specified application. The table above shows a type of polysulfide sealant formulation useful for construction applications.

Polysulfide adhesives and sealants have been successful in applications requiring good moisture, solvent and ozone resistance, and good weathering and low temperature properties. However, the chemical linkages that provide these properties also contribute to poor high temperature stability and high compression set because of stress relaxation.

Tips and Tricks

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