Ultra fine calcium carbonate Omyabond 120

Polybutadiene Polyol-based Polyurethane Adhesive

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

Polybutadienes

Applicable Industrial Sectors

Automotive , Buildings & constructions

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):

Polybutadiene resin (Poly bd R45HTLO from Sartomer)

xxx

Chain extender (Voranol 220-530 from Dow Chemical)

xxxxx

Filler (Dixie clay, Kaolin)

xxx

Epoxy silane adhesion promoter (3-glycidoxypropy-trimethoxysilane, A-137, from Witco-OSi)

xxxxx

Antifoam agent

xxx

Component B (Isocyanate Component):

Polyfunctional MDI liquid (Isonate 143L from Dow Chemical)

xxxxxxxxxxxxxxxxxxxxx

(Source: Sartomer)

Typical Properties

Properties

Tensile strength of adhesive film, psi

xxxx

Elongation of adhesive film, %

xxx

Tear (ASTM D1004 Die C)

xxx

Lap shear strength on clean aluminum, psi:

• Initial

xxxx

• Water immersion for 28 days at 25°C

xxxx

• Humidity aging for 28 days at 38°C and 98% RH

xxxx

Processing

Resulting Properties

The formulation above is for a general purpose two component polyurethane adhesive based on polybutadiene polyol. Using polybutadiene polyol will provide much better hydrolytic stability than other conventional polyols (e.g., polyester or polyether).

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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