Energy savings plus mechanical reinforcement and rheology control

Waterborne, PVAc Wallboard Adhesive

Adhesives Formulation

Applicable Type

Waterborne Adhesives

Applicable Base Polymer

Polyvinyl Acetate Emulsions & Derivatives (PVAc)

Applicable Industrial Sectors

Buildings & constructions

Applicable Base Polymer Properties

Waterborne vinyl acetate adhesives for construction applications have relatively good flexibility and low temperature properties (by virtue of added plasticizers) and excellent adhesion to wood and paper. These adhesives provide a low to medium performance relatively inexpensive adhesive that dries quickly. A typical formulation consists of VAE latex, filler (if greater viscosity is desired), plasticizer (for improved flexibility), and water.

Typical Formulation Ingredients

Ingredient

Parts by weight

Polyvinyl acetate emulsion

xxxxx

Modified cellulose thickener

xxxx

Defoamers

xxxx

Benzoic ester plasticizer

xxxxx

Alkylphenol ethylene oxide condensate surfactant

xxxx

Aromatic sulfuric acid sodium salt dispersant

xxxx

Ethylene glycol stabilizer

xxxx

Inorganic polyphosphate dispersant

xxxx

Preservative

xxxx

Calcium carbonate (3-6 micron diameter) filler

xxxxx

Calcium carbonate (14-21 micron diameter) filler

xxxxx

(US Patent 6,300,400)

Typical Properties

Properties

Solids content, %

xxxxx

Density, lb/gal

xxxx

Viscosity, cps

xxxxxxxxxxxxx

Open time, mins

xxxx

Shear strength, lb, to gypsum after drying:

• 10 min

xxxxxx

• 15 min

xxxx

• 20 min

xxxxxxx

• 40 min

xxxxx

Processing

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Resulting Properties

This adhesive formulation has improved wet tack in which the adhesive joint remains firm immediately after the bond has been established. This adhesive formulation tends to have thixotropic properties that eliminate stringiness and provide good consistency. The adhesive also provides high solids content to lower cost and faster drying times.

The adhesive can have an open time greater than about 5 mins and a green strength sufficient to support a 4 foot by 8 foot wallboard on a wall frame without fasteners within 15 mins of applying the adhesive to the wallboard and wall frame.

Tips and Tricks

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