Great Bond Strength on Hard to Bond Materials
Heat Activation PUD Adhesive
|
Grades |
SE-5060 |
SE-5600 |
SE-5050
|
|
Polymer content (%) |
50 ± 1
|
50 ± 1
|
50 ± 1
|
|
Viscosity (cps) |
50 - 600 |
50 - 600 |
50 - 600 |
|
Heat Activation (℃) |
50 |
65
|
85 |
Special Features
|
Strong
|
Middle
|
Soft
|
|
Packing |
60Kg |
60Kg |
60Kg |
|
Grades |
IS-319 |
T-100 |
|
Name |
NCO Crosslink |
Thickener |
|
Polymer content (%) |
100 |
20 |
|
Additive (%) |
3 – 5 |
0.3 - 1.0 |
Packing |
1Kg |
5Kg and 20Kg |
Footwear 
Textile 
Automotive 
Wood & Furniture 
Flexible Packing 
The most important bonding process with
polyurethane adhesives, both solvent-based and water-based, is by heat
activation. Therefore, water-based adhesives based on are generally processed
like solvent-based polyurethane adhesives using heat activation.
Film formation of a waterborne polyurethane
adhesive
The graph on the right
refers to adhesive tack.
If the tack of the adhesive film is measured at various temperatures, it is
observed that at room temperature or below, many polyurethane form a non-tacky film similar to a coating. But at a temperature of
~50°C, it is observed that the tack property jumps in value. This means that the adhesive film needs to be
warmed to a minimum of ~50°C to allow tack to develop and thus enable a good
bond to form.
If a dispersible NCO crosslinking is added,
the polymer modulus level increases over the course of several days owing to
polymer crosslinking. This results in a higher molecular weight polymer with high
ultimate heat resistance.
Through cooling of the adhesive film and crystallization of the PU, a high initial bond strength is obtained after a short time, even with one-component processing. Moreover, the tackiness of these systems can be switched on and off, enabling a highly flexible production process.
Polyurethane dispersions have good heat
resistance 120℃ as supplied but it can be improved to meet rigorous high
temperature application requirements through the use of NCO crosslinkers. The systems cure
at room temperature over a period of a few days to achieve superior final
performance.