Abstract
Shoes, made up of an upper shoe, insole, and outsole, are manufactured by adhering each of the parts together. It has been proven that pre-treating each of these parts greatly improves the adhesive strength when adhering them together. However, harmful materials such as volatile organic compounds (VOCs) are often emitted from organic solvents during pre-treatment, causing environmental concerns such as air pollution in the workplace. Therefore, this study was conducted to develop a water-based polyurethane skin resin for fabricating a synthetic leather and textile adhesive that has greater adhesive strength and does not require pre-treatment. To achieve this, two waterborne polyurethane solutions, one with excellent thermal resistance and light fastness (waterborne polyurethane A) and the other with high adhesive strength (waterborne polyurethane B), were mixed to impart the superior characteristics of each to a third waterborne polyurethane solution. Through this approach, we were able to successfully fabricate an excellent waterborne leather polyurethane resin with ethylene vinyl acetate (EVA) for midsoles (peel strength: 2.9 kgf/cm) and for rubber out-soles (peel strength: 2.4 kgf/cm) without using pre-treatment.
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