Energy savings plus mechanical reinforcement and rheology control

1K Solvent Based Polyurethane Adhesive

Adhesives Formulation

Applicable Type

Solvent borne Adhesives

Applicable Base Polymer

Polyurethanes

Applicable Industrial Sectors

Leather , Shoe assembly , Apparel / Textile (clothing)

Applicable Base Polymer Properties

Polyurethane adhesives are often chosen over polychloroprene adhesives when greater resistance to plasticizer migration is required or difficult-to-bond polymeric substrates are involved. One of the largest applications is in footwear where high bond strengths to polyurethane, styrene block copolymers, and PVC compositions are required. Polyurethane adhesives also give the formulator more freedom in “engineering” the modulus and elongation required of the adhesive film to meet specific applications.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Polybutylene adipate (3000 mw)

Butane diol

xxxx

4, 4’ Methylene diisocyanate (MDI)

xxxx

Methyl ethyl ketone

Typical Properties

Properties

Engineering strain at break, %

xxxx

Tensile strength, MPa

90° T-peel (polyurethane to leather), piw

Processing

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Resulting Properties

Solvent borne polyurethane adhesives are widely used because of their easy application, fast setting properties, and excellent adhesion to many different substrates. The adhesive is generally coated on both surfaces to be joined. After the carrier evaporates, the two surfaces are brought together under slight pressure, and the adhesive bonds to itself.

This PU adhesive formulation will have a low glass transition temperature for good performance at low temperatures, and the adhesive will possess very good flexibility. If the formulator determines that the process requires more rapid buildup of adhesion properties, hexanediol could be substituted for butanediol in the soft segment.

Tips and Tricks

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