Energy savings plus mechanical reinforcement and rheology control

General Purpose Two Component Polyurethane Adhesive

Adhesives Formulation

Applicable Type

Reactive Adhesives

Applicable Base Polymer

Isocyanates

Applicable Industrial Sectors

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

Applicable Base Polymer Properties

Polyurethanes are extensively and successfully used as adhesives and sealants, and they have an excellent record of durability. Polyurethane-based adhesives form tough bonds with high peel strength. They have better low temperature strength than other adhesives. They have exceptionally high strength at cryogenic temperatures. They have good chemical resistance, although not generally as good as epoxies or acrylics. Urethanes do not have high temperature resistance. Maximum upper use limits are about 150°C, and most formulations are used below 100°C.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Part A

Polyester Polyol (1.8 % hydroxyl content)

Part A

Polyether polyol (11% of hydroxyl content)

Part A

Silica Highly dispersed

Part A

Whiting

xxx

Part A

Zeolite Paste , 50 %

Part B

Polyisocyanate (diphenylmethane-4,4-diisocyanate and polymeric polyisocyanates NCO content 30%)

Processing

Resulting Properties

The formulation above is for a general purpose two component polyurethane adhesive. The pot life for this system is about 2 hours at room temperature. Often additives are not required to provide flexibility or toughness as in the case of epoxy formulations. Polyurethanes have the capability of providing these properties through manipulation of the resulting molecule by proper choice of isocyanate and polyol. However, additives are used mainly to stabilize the adhesive relative to moisture, oxidation, UV, etc.

Pot life is 2 hrs at 20°C

Tips and Tricks

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