When processing complex paste systems with aminoterminated copolyamides a choice of important processing guidelines must be considered. Especially the "open time" is important when applying the paste to the substrate. The "open time" defines a time period betwen coating of the adhesive paste and fusing of the laminate / composite / lining.
The crosslinker ROWAFLEX® X 600 in combination with the aminoterminated, crosslinkable copolyamide ROWALIT® 200-63 defines also the "open time" at the paste preparation and following coating process. After the paste formulation has been prepared it should be processed / coated within 2 hours.
Sequence |
Product | Qty (kg) |
Purpose |
1. | Water | 55.0-60.0 | Matrix |
2. | ROWAFLEX® X 600 | 3.00 | Emulsifier/Crosslinker |
3. | ROWALIT® 200-63 | 30.00 | Aminoterminated COPA |
4. | ROWAFLEX® TH 3 |
0.30-0.50 (max. 0.80) |
Thickener |
5. | ROWAFLEX® X 100 | 8.0-10.0 | Stabilizer |
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Stork – CT 4 Pastehead | Meyer - Flow-through-press |
As shown in the above time/temperature chart, the open time is reduced the higher the dryer temperature is. In practice, this means that lamination must be executed within 2 hours. Otherwise the bond strength decreases severely. A direct lamination process does not impact bond strenght and provides favourable results.
If no direct lamination is possible, the coated substrate must be laminated/ fused within 2 hours:
The results of aminoterminated copolyamides used in crosslinkable paste formulation are outstanding when processed with appropriate parameter settings.
Automotive: Example rear shelves
At this application the special properties as high adhesion and cohesion is exploited. It garantees a high heat resistance and excellent bond strenght against usual commercially used needle felts.
Schematic view of Double-dot Process:
We are happy to advise you further. Contact our experienced technicians.
ROWAK AG