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Adhesives Ingredients
The material selection platform
Adhesives Ingredients

Non-sagging, Structural Polyurethane Adhesive for Bonding Sheet Molding Compound

Adhesives Formulation

Applicable Base Polymer
Applicable Industrial Sectors

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

Ingredient
Parts by weight
Component A (Polyol Component): 
 
Poly (propylene oxide) triol EO-tipped (eqw. 2000) 
xxxx 
Aromatic amine terminated polyether (ATPE) 
xxxx 
1,4 butanediol 
xxxx 
Bis (4-aminocyclohexyl) methane 
xxx 
Sodium potassium aluminosilicate in castor oil 
xxx 
Talc 
xxxx 
Dimethylltin dilaurate 
xxxx 
Component B (Isocyanate Component): 
 
Mondur MRS-4 
xxxx 
Poly (propylene oxide) triol EO-tipped (eqw. 2000) 
xxx 
Talc 
xxxx 

Typical Properties

Properties
Viscosity of polyol blend mPas @ 25°C, mPas 
xxxxxxxxxxxxxx 
NCO content of isocyanate component, % 
xxxx 
Isocyanate / polyol ratio 
xxxx 

Processing

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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.

Tips and Tricks

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