Energy savings plus mechanical reinforcement and rheology control

PVC Plastisol for Automotive Body 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

Formula A:

1. PVC resin dispersion (Oxy 521, Occidental Chemical)

2. PVC extender resin (Oxy 565, Occidental Chemical)

3. Di-oxtyl phthalate (Eastman Chemical)

xxxxx

4. Calcium carbonate (Ashland Chemical)

xxxxx

5. Titanium dioxide (DuPont Chemical)

xxxxx

6. Trifunctional methacylate ester (SR9011, Cray Valley)

7. Metallic diacrylate (Saret SR633, Cray Valley)

8. t-Butyl perbenzoate

xxx

Formula B:

1. PVC resin dispersion (Oxy 521, Occidental Chemical)

2. PVC extender resin (Oxy 565, Occidental Chemical)

3. Di-oxtyl phthalate (Eastman Chemical)

xxxxx

4. Calcium carbonate (Ashland Chemical)

xxxxx

5. Titanium dioxide (DuPont Chemical)

xxxxx

6. Trifunctional methacylate ester (SR9011, Cray Valley)

7. Metallic diacrylate (Saret SR633, Cray Valley)

8. t-Butyl perbenzoate

xxx

(Source: Cray Valley Application Bulletin, “The Use of Cray Valley Metallic Coagents in Pumpable Sealants”, 2010.)

Typical Properties

Properties

Formula A:

Cure conditions

xxxxxxxxxxxxxxxxx

Viscosity

xxxxxxxxxxx

Lap shear on CRS, psi

Thin film adhesion on electroplated steel

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Formula B:

Cure conditions

xxxxxxxxxxxxxxxxx

Viscosity

xxxxxxxxxxx

Lap shear on CRS, psi

xxx

Thin film adhesion on electroplated steel

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Processing

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Resulting Properties

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 both the adhesive and sealant markets. The formulations show that the use of a metallic diacrylate produces significantly higher adhesion to cold rolled steel.

Tips and Tricks

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