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Polyvinyl Butyral-Phenolic Structural Adhesive (B)

Adhesives Formulation

Applicable Type

Sealants

Applicable Industrial Sectors

Automotive

Applicable Base Polymer Properties

Polyvinyl acetal adhesives generally are formulated from either polyvinyl butyral or polyvinyl formal resins. The polyvinyl butyral is much more soluble and has a lower melt viscosity. It is a more flexible polymer and provides better peel strength. Polyvinyl butyral adhesives are supplied as hot melt adhesives or as solvent solutions of high viscosity and low solids content. These adhesives are water white and transparent, light stable, and have excellent adhesion to glass. Polyvinyl butyral is commonly used in laminating safety glass.

Typical Formulation Ingredients

Ingredient

Parts by weight

Polyvinyl butyral resin (Butvar B-90, Eastman Chemical Company)

xxx

Phenolic resin (Plyophen 22-023, OxyChem)

(Source: Eastman Chemical Company)

Typical Properties

Properties

Cure time, min

Cure temperature, °C

xxx

Tensile shear strength on aluminum, psi, measured at:

• 23°C

xxxx

• 83°C

xxxx

• 123°C

xxxx

Peel strength on aluminum at 23°C, piw

xxxxx

Processing

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Resulting Properties

Combinations of polyvinyl butyral with thermosetting resins have been used as structural adhesives in the aircraft industry to replace rivets and other methods of joining and fastening. Refinements in formulating led to their use in bonding brake linings, in the electrical and electronic industries on printed circuits, in structural composite fiber binders for aerospace or antiballistic applications, and in the architectural field for the manufacture of interior and exterior curtain walls. Outstanding properties of the PVB-phenolic system include high peel strength at very low temperatures, excellent dielectric properties, and exceptionally good creep resistance.

Polyvinyl Butyral-Phenolic Structural Adhesive (B)

Applicable Base Polymer Properties

Typical Formulation Ingredients

Typical Properties

Processing

Resulting Properties

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