| ADH is used to cure functionalized copolymers, such as those containing aldehyde, ketone, and epoxy moieties. At room temperature, the amino functionality of ADH rapidly crosslinks copolymers containing diacetone acrylamide (DAAM). ADH is also used as a curing agent for bisphenol glycidyl epoxy resins, and for urethane pre-polymers. ADH has been used to scavenge formaldehyde. The combination of ADH with diacetoneacrylamide (DAAM) in a acrylic emulsion affords a highly advantageous crosslinking chemistry for high quality architectural paints and other coating systems. Advantages of the DAAM-ADH crosslinking system include: - Easy and safe to use
- Formaldehyde free
- DAAM uniformly copolymerizes within acrylic copolymers, creating well-dispersed pendant ketone crosslinking sites
- Wet acrylic emulsions based on diacetone acrylamide with ADH in the aqueous phase, are initially non-reactive and afford emulsions with good long-term stability and “in-can” stability
- 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 enhanced mechanical strength and durability as well as maximum film cohesive properties.
- Crosslinking with the keto-hydrazide chemistry enhances abrasion, scrub, stain, and blocking resistance; moisture and solvent resistance; and substrate adhesion.
End uses include:- Paint and coatings
- Textile and paper treatments
- Adhesives and sealants
- Printing inks
- Polishes and waxes
Information provided by Gantrade Corporation. |
