Energy savings plus mechanical reinforcement and rheology control

2K Polyurethane Adhesive for Bonding Teflon to Aluminum

Adhesives Formulation

Applicable Type

Polyurethane Adhesives

Applicable Base Polymer

Polyurethanes

Applicable Industrial Sectors

Buildings & constructions , 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. 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

Part A:

Polymeric methylene diisocyanate (PAPI 901, Dow Chemical)

xxxx

Part B:

Polypropylene glycol polyol (Titanol PPG 200, Cameo Chemicals)

xxxxx

Aluminum silicate (Glomax LL, Imerys Performance Materials)

xxxxx

Polyether amine (Jeffamine T-403, Huntsman)

xxxx

(Source: Flick, E.W., Adhesive and Sealant Compound Formulations, Noyes Publications, 1984, p. 231)

Typical Properties

Properties

Mixing ratio (Part A:Part B) by weight

xxxx

Viscosity increase

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Flexibility

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Processing

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Resulting Properties

The formulation above is for a general purpose two component polyurethane adhesive based on polypropylene glycol. It has very good adhesion on metals and low surface energy substrates such as Teflon. 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 sometimes used mainly to stabilize the adhesive relative to moisture, oxidation, UV, etc.

Tips and Tricks

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