Energy savings plus mechanical reinforcement and rheology control

Polyvinyl butyral – Phenolic High Performance Solvent Borne Adhesive (A)

Adhesives Formulation

Applicable Type

Solvent borne Adhesives

Applicable Industrial Sectors

Aircraft & Aerospace

Applicable Base Polymer Properties

Polyvinyl butyral-phenolic ratios of from 10:1 to 10:20 have been used successfully for structural adhesives, although 10:5 seems to be the best ratio for a compromise of properties. As the amount of phenolic is reduced, the cured adhesive becomes more flexible, and in most cases, peel strength increases. In addition, because of the increased thermoplastic nature of the system, the high temperature shear strength is reduced. These effects, i.e., increased peel and reduced high temperature shear strength, occur when the cure time is shortened or the cure temperature is lowered.

Typical Formulation Ingredients

Ingredient

Parts by weight

Polyvinyl butyral resin (Butvar B-72, Monsanto Company)

xxx

Polyvinyl butyral resin (Butvar B-90, Monsanto Company)

Phenolic resin (e.g., SP-1044 resin, SI Group)

Solvent blend (e.g., 55% ethyl alcohol, 45% toluene)

xxxxxxxxxxx

(Source: Butvar Polyvinyl Butyral Resin: Properties and Uses, Eastman Chemical Company, November, 2013)

Typical Properties

Properties

Cure conditions

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Shear strength on aluminum, psi, at:

• 23°C

xxxx

• 83°C

xxxx

• 121°C

xxxx

• 150°C

xxx

Peel strength on aluminum, lb/in

xxxxx

Processing

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Resulting Properties

Combinations of Butvar® resin with thermosetting resins have long been in use in bonding aircraft components. In fact, the system was the first synthetic resin adhesive to be used for bonding metals in structural applications. Compared with other general types of structural adhesive systems (epoxy-phenolic and synthetic rubber-phenolic), the PVB-phenolic gives the highest shear strength values at temperatures up to 125°C. Other outstanding properties of the PVB-phenolic system include high peel strength at very low temperatures, excellent dielectric properties, and exceptionally good creep resistance as measured by the ability of the bond to carry sustained loads for extended periods of time.

Tips and Tricks

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