Energy savings plus mechanical reinforcement and rheology control

Polybutadiene Polyol Based Polyurethane Sealant by Cray Valley

Adhesives Formulation

Applicable Type

Sealants , Polyurethane Adhesives

Applicable Base Polymer

Polyurethanes

Applicable Industrial Sectors

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

Polybutadiene resin (Poly bd R45HTLO, Cray Valley)

xxx

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

Asphalt (120-150 penetration)

xxx

Filler (calcium carbonate)

xxx

Molecular sieve (Siliporite SA1720, Atofina)

Dibutyl tin dilaurate

xxx

Process oil (naphthenic or phthalate based)

xxx

Polyfunctional MDI liquid

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Typical Properties

Properties

Viscosity of Part A @ 55° C

xxxxxx

Viscosity of Part A @ 85° C

xxxxxxx

Tensile strength of adhesive film, psi

xxx

Elongation of adhesive film, %

xxx

Tear (ASTM D1004 Die C), pli

Hardness, Shore A

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 Polybutadiene Polyol Based Polyurethane Sealant formulation is Cray Valley.

Tips and Tricks

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