Energy savings plus mechanical reinforcement and rheology control

Low Fusion Temperature PVC Plastisol Sealant

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

Polyvinyl Chlorides (PVC)

Applicable Industrial Sectors

Automotive

Applicable Base Polymer Properties

The main feature of the PVC resin used in formulating a plastisol is the particle size. It must be small enough to permit it to stay in suspension without settling. This usually mandates a dispersion grade of PVC powder (about 1 micron in diameter). Another key requirement is that the resin must resist solvation at room or storage temperatures so that the final product will have a practical shelf life.

Typical Formulation Ingredients

Ingredient

Parts by weight

PVC resin (dispersion grade powder)

xxx

Adhesion promoter (maleic acid modified vinyl terpolymer resin)

Diisodecyl phthalate

xxx

Ethylene glycol dimethacrylate

t-butyl perbenzoate

xxx

Stabilizer (barium, cadmium)

Calcium carbonate

xxx

Typical Properties

Properties

Butt tensile strength after 45 mins at 150°C: Tensile, psaType failure

xxxxxxxxxxxx

(Source: Bullman, A.R., “Plastisol Sealants for Automotive Applications”, Journal Elastoplastics, Vol., 1, October 1969, pp. 256-265).

Processing

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Resulting Properties

Plastisols require temperatures on the order of 130°C to 400°C to “cure”. The main feature of this formulation is that it will harden at the lower temperature range (e.g., 45 mins at 150°C). Such a plastisol can be supplied as a one component paste without the need for metering or mixing prior to application. Moderately high bond strength can be achieved to many common substrates. Long-term flexibility is a distinct advantage in that the plastisol can accommodate relative motion between substrates and act as a vibration damper. This feature enables PVC plastisols to compete in the sealant markets.

Tips and Tricks

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