Chemical Name : DIACETONE ACRYLAMIDE ( DAAM )
Molecular Formula : C9H15NO2
Molecular Weight : 169.22
CAS NO. :2873-97-4
Technical Characteristics:
| Appearance | White to slightly yellow flake |
|---|---|
| Melting Point (℃） | 55.0-57.0 |
| Purity（%） | ≥99.0 |
| Moisture（%） | ≤0.5 |
| Inhibitor（PPM） | ≤100 |
| Acrylamide (%） | ≤0.1 |
| Solubility In Water（25℃） | >100g/100g |
Ambient Cure Acrylic Emulsion Polymers Utilizing DAAM/ADH Technology
Solvent-based polymer systems are giving way to water based acrylic polymer emulsions due to environmental concerns and related regulations limiting volatile organic compounds (VOCs), as well as a desire to achieve significant improvements in the performance characteristics of the water-based emulsion polymers.
Waterborne acrylic polymers have seen advancements in film mechanical properties; chemical, water, and abrasion resistance; durability; adhesive properties; and solvent resistance. New developments in polymer crosslinking chemistries have contributed to this array of performance enhancements.
The leading crosslinking technology—crosslinking chemistry based on diacetone acrylamide (DAAM) and adipic acid dihydrazide (ADH)– is known as keto-hydrazide crosslinking.
Advantages of the DAAM/ADH Crosslinking System
There are multiple considerations related to the DAAM-ADH crosslinking system that provide many benefits for consumers:
- DAAM and ADH are safe to use.
- Both are easy to use for a variety of formulations.
- Neither DAAM nor ADH contains formaldehyde.
- Diacetone acrylamide uniformly copolymerizes within acrylic copolymers, creating well-dispersed pendant ketone crosslinking sites.
- Waterbased acrylic emulsions based on diacetone acrylamide with ADH in the aqueous phase, are initially non-reactive and afford emulsion polymers with good long-term stability for easier shipping and storage in retail containers.
After film coalescence, crosslinking becomes rapid at ambient temperatures, thanks to water evaporation in the drying process and a simultaneous reduction in pH arising from the loss of ammonia.
Because crosslinking is post-coalescence, the resulting three-dimensional polymer network exhibits maximum film cohesive properties, as well as enhanced mechanical strength and durability.
Crosslinking with the keto-hydrazide chemistry enhances some key attributes, including abrasion, scrub, stain, and blocking resistance; moisture and solvent resistance; and substrate adhesion.