Energy savings plus mechanical reinforcement and rheology control

Plasticized Two-part Polysulfide Sealant (B)

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

Polysulfides

Applicable Industrial Sectors

Buildings & constructions , 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

Manganese dioxide

xxxx

Plasticizer (e.g., dibutyl phthalate)

xxxx

Catalyst (dibutyl tin diacetate)

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 defines several types of polysulfide sealant formulations and 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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