Energy savings plus mechanical reinforcement and rheology control

1K, Heat Cured Polybutadiene Sealant (160°C Cure) by Cray Valley

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

Polybutadienes

Applicable Industrial Sectors

Automotive , Buildings & constructions

Applicable Base Polymer Properties

Polybutadiene resins are low molecular weight, hydroxyl-terminated homopolymers of butadiene. These hydroxyl-terminated polybutadiene (HTPB) resins are characterized by low volatiles content, low glass transition temperatures, excellent hydrophobicity and a highly reactive functionality.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Polybutadiene resin (R45HT, Cray Valley)

xxx

Silica (HiSil 230, PPG Silica Products)

Zinc oxide

xxx

Stearic Acid

xxx

Magnesium oxide (Maglite D, Hallstar)

xxx

Antioxidant (Resin D, Emerald Performance Materials)

xxx

Co-curing agent (Saret SR633)

Benzoyl peroxide (CADOX BS)

Typical Properties

Properties

Lap shear strength glass to CRS, psi

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Lap shear strength glass to E-coat, psi

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Processing

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Resulting Properties

The formulation above is for a general purpose heat cured sealant based on polybutadiene resin. Using polybutadiene will provide better hydrolytic stability than other conventional elastomers. Sartomer 633 is a metallic diacrylate coagent, which when added to peroxide-containing sealant formulations co-cures to provide the necessary properties for good sealant performance, especially adhesion. Heat age values (130°C/two weeks) increase over the RT tests.

Tips and Tricks

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