Energy savings plus mechanical reinforcement and rheology control

Polyurethane Light Stable Seam Sealant for Textiles

Adhesives Formulation

Applicable Type

Reactive Adhesives , Polyurethane Adhesives

Applicable Base Polymer

Polyurethanes

Applicable Industrial Sectors

Apparel / Textile (clothing)

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):

Methyl ethanolamine

xxx

Bis (4-aminocyclohexyl) methane

xxx

Poly (propylene oxide) diol (eqw. 1000)

xxxx

Propoxylated bisphenol A diol (eqw. 275)

xxxx

Dimethyl tin dilaurate

xxx

Component B (Isocyanate Component):

Desmodur N3300

xxxx

LB-25A monofunctional polyether

xxxx

(Source: Bayer)

Typical Properties

Properties

Viscosity of polyol blend mPas @ 25°C, mPas

xxxx

NCO content of isocyanate component, %

xxxx

Isocyanate / polyol ratio

xxxx

Processing

Resulting Properties

The formulation above is for a general purpose two component polyurethane adhesive. It can be used as a light stable seam sealant in the textile industry. The pot life for this system is about 2 hours at room temperature. 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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