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Monday, 23 September 2019
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Raw materials & technologies, Applications

Preparing waterborne polyurethane-acrylate emulsions for footwear adhesives

Wednesday, 25 May 2016

Korean researchers prepared stable emulsions of emulsifier/N-methylpyrrolidone-free crosslinkable waterborne polyurethane-acrylates (C-WBPUAs) with various acrylic monomer contents for footwear adhesive materials.

C-WBPUA20 and C-WBPUA30 can be recommended as high-performance adhesive materials for footwear. Source: w.r.wagner/pixelio.de

C-WBPUA20 and C-WBPUA30 can be recommended as high-performance adhesive materials for footwear. Source: w.r.wagner/pixelio.de

They examined the effects of the acrylic monomer content on the shelf stability, mean particle size, and viscosity of the C-WBPUA emulsions; the tensile properties and dynamic mechanical thermal properties of the C-WBPUA film samples; and the adhesive strengths between the upper (synthetic leather) and the sole (ethylene vinyl acetate rubber) in both the dry and wet states of the formulated adhesives (C-WBPUA emulsion–thickener–hardener).

Clear recommendation for for C-WBPUA20 and C-WBPUA30

The adhesive strengths of the formulated adhesives for footwear (leather–sole) in both the dry and wet states increased with increasing acrylic monomer content up to 20 wt %; after this, they almost levelled off. Thus, C-WBPUA20 and C-WBPUA30, where the number indicates the acrylic monomer content, can be recommended as high-performance adhesive materials for footwear.

The study is published in: Applied Polymer Science.

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