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3.5.2 Polyurethane

Figure 15.

Figure 14.

Polyurethane adhesives cure with polyol and isocyanate at room temperature. During the reaction, it generates some carbon dioxide (CO2). One unique feature of polyurethane adhesive is that its cure is sensitive to the moisture level. For some applications to achieve the best and most durable adhesion, the use of appropriate cleaners and primers (adhesion promoters) is recommended. Depending on the substrates, different primers are used. According to where it is used, they consist of

according to the ambient temperature and mixed amount. Figures 15 explains that the open time in high temperature environment such as summer time reacts fast and has a short open time while it does a long open time in cold environment such

Polyurethane characteristics are excellent toughness and flexibility, high elongation, excellent gap filling, paintable when cured, and excellent chemical resis-

Typical applications of polyurethane are bonding/sealing of direct glazing window for automotive, railway, and earth movers (one-component, two-component);

one-component PU and two-component PU. PU has a different open time

as winter time (see Figures 14 and 15) [16].

Open time versus ambient temperature of two-component polyurethane.

Curing mechanism of two-component polyurethane.

Adhesives and Adhesive Joints in Industry Applications

3.5.2.1 Polyurethane characteristics

3.5.2.2 Typical applications

tance.

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ChulSoo Woo Henkel (China) Investment Co., Ltd, Shanghai, China

\*Address all correspondence to: cs.woo@henkel.com

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