Ultra fine calcium carbonate Omyabond 120

2K Hydroxy Terminated Polybutadiene Encapsulating Resin

Adhesives Formulation

Applicable Type

Polyurethane Adhesives

Applicable Base Polymer

Polybutadienes

Applicable Industrial Sectors

Automotive , Electrical & Electronic Bonding

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.
Exceptionally high strength at cryogenic temperatures.
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.

Source: Yoo, T. and Chao, H., “Hydroxyl-Terminated Polybutadiene Liquid Resins for Adhesives Applications”, Adhesivesmag.com, January 6, 2017

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

A: Hydroxy Terminated Polybutadiene Component

Polybutadiene resin (Poly bd R45HTLO, Cray Valley)

xxx

B: Isocyanate Component

Polyfunctional MDI liquid (Isonate 143L, Dow Chemical Co.)

xxxx

Typical Properties

Properties

Hardness, Shore A

Tensile strength, psi

xxx

Elongation, %

Dielectric constant, 25°C, 1 kHz

xxxx

Volume resistivity, 25°C, 1,000 Hz

xxxxxx

Glass transition temperature, °C

xxxxx

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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