Energy savings plus mechanical reinforcement and rheology control

Non-filled Polybutadiene Polyol Based Polyurethane Sealant by Cray Valley

Adhesives Formulation

Applicable Type

Sealants , Polyurethane Adhesives

Applicable Base Polymer

Polyurethanes

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

Phase

Ingredient

Parts by weight

A (Polyol Component):

Polybutadiene resin (Poly bd R45HTLO, Cray Valley)

xxx

A (Polyol Component):

Chain extender (2-ethyl-1,3-hexanediol)

B (Isocyanate Component):

Polyfunctional MDI liquid (Isonate 143L,Dow)

xxxx

Typical Properties

Properties

Viscosity

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Moisture vapor transmission rate at 2 mm thickness, 2mm/m2 24 hrs

xxxx

Water uptake, %, after 24 hrs at 23°C

xxxxx

Water uptake, %, 2 hrs at 100°C

xxxxx

Processing

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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.

The source of Non-filled Polybutadiene Polyol Based Polyurethane Sealant is Cray Valley.

Tips and Tricks

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