Energy savings plus mechanical reinforcement and rheology control

Low Cost PVAc / Starch Wood Adhesive

Adhesives Formulation

Applicable Type

Waterborne Adhesives

Applicable Base Polymer

Polyvinyl Acetate Emulsions & Derivatives (PVAc) , Starches

Applicable Industrial Sectors

Buildings & constructions , Consumer / household / office , General wood assembly

Applicable Base Polymer Properties

Waterborne polyvinyl acetate adhesives are one of the most popular base polymers for formulating wood glues. These adhesives provide a low to medium performance, inexpensive adhesive that dries to a relatively rigid, porous material. A typical formulation consists of polyvinyl acetate latex, filler (if greater viscosity is desired), plasticizer (for improved flexibility), and water.

Typical Formulation Ingredients

Ingredient

Parts by weight

Water

xxxx

Tripotassium orthophosphate

xxxx

Tributyl phosphate

xxxx

ASP-100 aluminum silicate

xxxx

Corn starch

xxxx

Polyvinyl alcohol (Vinol 523, Air Products

xxxx

Preservative (Dowicide G, Dow Chemical)

xxxx

Vinyl acetate emulsion (Vianc XX-210, Air Products)

xxxx

(Source: Air Products)

Typical Properties

Properties

Shear strength to maple (ASTM D905), psi

xxxxx

Brookfield viscosity, cps

xxxxxxxxxxx

Total solids content, %

xxxx

Processing

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Resulting Properties

The low viscosity of the PVAc water emulsion and its fast setting capability provide an excellent adhesive for wood bonding. The adhesive has good resistance to water and good adhesion to most substrates. This formulation has improved wet tack. It also tends to have thixotropic properties that eliminate stringiness, provide consistency, and control penetration into porous substrates.

Tips and Tricks

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