Energy savings plus mechanical reinforcement and rheology control

1K Moisture Curing Sealant Based on Non-hydrophobic Polyether Prepolymer by Dow Chemical

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

Polyethers

Applicable Industrial Sectors

Automotive , Buildings & constructions , Electrical & Electronic Bonding , Assembly , Industrial Assembly , Transportation (excl. Automotive)

Applicable Base Polymer Properties

The Dow Chemical Company has developed a novel class of hydrophobic polyether polyols that can impart hydrophobic character to polyurethane formulations while simultaneously offering the benefits of:

Low viscosity
Tunable molecular weight
Fidelity of polyol functionality

Vorapel D3201 is a hydrophobic diol with a hydroxyl equivalent weight of approximately 1000. It is a clear, colorless liquid exhibiting very low viscosity (~ 300-500 cps)

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Prepolymer (Voranol 220-056N, Dow Chemical)

Plasticizer: High molecular weight benzyl phthalate

Filler: Precipitated 0.7 micron calcium carbonate

Filler: Precipitated 70 nm calcium carbonate

xxx

2,2’-dimorpholinodiethylether (DMDEE)

xxx

Crosslinked (PAPI 27)

xxx

Typical Properties

Properties

Tack free time, min

Hardness, Shore A

Tensile strength, psi

xxx

Elongation, %

xxx

Stress @ 100% elongation, psi

Processing

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Resulting Properties

This Fully formulated sealant systems can is be made using Vorapel D3201 hydrophobic prepolymers. An example of a formulated system is shown above. It has Mechanical properties comparable to a sealant formulated with a conventional polypropylene oxide polyol prepolymer are obtained. However, the VORAPEL-based system will offer improved retention of these properties under exposure to water.

A formulation by Dow Chemical