Energy savings plus mechanical reinforcement and rheology control

Solvent Based 2K Polyurethane Shoe Adhesive

Adhesives Formulation

Applicable Type

Solvent borne Adhesives , Polyurethane Adhesives

Applicable Base Polymer

Polyurethane Dispersions (PUDs)

Applicable Industrial Sectors

Footwear & leather , 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 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

Ingredient

Parts by weight

Part A:

Polyester polyol (Desmophen 1200, Bayer)

Polyester polyol (Desmophen 1700, Bayer)

Vinyl emulsion (Mowilite 30, Hoechst Celanese) 20% in solvent mix*

xxx

Solvent mix*

xxxx

Organic dyestuff

xxx

Part B:

Aromatic polyisocyanate (Desmodur L75, Bayer)

xxxx

(Source: Bayer)

*Solvent Mix:

1-methylpropylacetate

2-butyl acetate

3-ethyl acetate

Xylene

Processing

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Resulting Properties

Contact adhesives are widely used because of their easy application, fast setting properties, and excellent adhesion to many different substrates. The contact adhesive is 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. Polyurethane contact adhesives can be applied similarly to polychloroprene contact adhesives. A typical formulation for a solvent borne polyurethane contact adhesive is provided in the above table.

Tips and Tricks

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