Energy savings plus mechanical reinforcement and rheology control

Epoxy Adhesive Modified with Varying Amounts of Polysulfide Resin (G)

Adhesives Formulation

Applicable Type

Reactive Adhesives

Applicable Base Polymer

Polysulfides

Applicable Industrial Sectors

Buildings & constructions , General caulking & sealing , 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 liquid polysulfide polymer can be transformed from a liquid state into a solid elastomer, even at low temperatures.

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.

Typical Formulation Ingredients

Ingredient

Parts by weight

Epoxy Resin (EEW 175 to 210)

xxx

Polysulfide resin, LP-3

xxx

Hardener, DMP-30

(Source: Panek, J. R., “Polysulfide Sealants and Adhesives”, in Handbook of Adhesives, 3rd ed., I. Skiest, ed., van Nostrand Reinhold, New York, 1992)

Typical Properties

Properties

Tensile, psi

xxx

Elongation, %

xxx

Shore D Hardness

Coef. Of Thermal Expansion, in/in/°CX105

xxxx

Impact Resistance, ft-lb

xxx

Processing

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Resulting Properties

Typical properties of several polysulfide-epoxy adhesives are shown in the table above. Room temperature tensile shear strength will depend on the substrate and the adhesive formulation. Generally, tensile strength properties reach a maximum at about 10-30% polysulfide concentration. Peel strength can be as high as 20 lb/in. The heat distortion temperature is only slightly affected by the incorporation of 20% polysulfide polymer, but at a 1:1 ratio the drop becomes significant. This property prevents the use of polysulfide-epoxy adhesives at elevated temperatures.

Polysulfide-epoxy adhesives can be used in various chemical and solvent environments, even under immersion conditions. The systems exhibit low permeability to water and water vapor, which provides improved water and corrosion resistance. Polysulfide-epoxy adhesives also cure with very low shrinkage, in contrast to unmodified epoxy resins, which may exhibit volume shrinkage as high as 5%. Polysulfide-epoxy adhesives provide resistance to thermal shock and cycling as well as resistance to low temperature environments.

Tips and Tricks

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