CYMEL® 202 Resin
Knowde Enhanced TDS
Identification & Functionality+
Features & Benefits+
- Very fast cure response
- Medium to high solids
- Low formaldehyde release
- Can and container coatings
- General industrial coatings
- Automotive coatings
Applications & Uses+
|Value||Units||Test Method / Conditions|
|Viscosity (at 23°C)||2500-7500||mPa.s||DIN EN ISO 3219|
|Color||max. 70||APHA||DIN EN ISO 6271|
|Non-Volatile Content||78-82||%wt||DIN EN ISO 3251 (Pan,3 hrs/105°C)|
|Non-Volatile Content||80-84||%wt||DIN 55671 (Foil, 45 min/45°C)|
|Free Formaldehyde Content||max. 0.6||%||Sulfite Titration|
|Alkyd resins||Very good|
|Polyester resins||Very good|
The stability of solvent-borne systems containing CYMEL 202 resin can be enhanced by the addition of primary alcohols, amines, or a combination of these. Low molecular weight primary alcohols such as ethanol or n-butanol are most effective. Recommended amines are TEA or DMEA at a concentration of 0.5-1.0% on total binder solids. For best stability in waterborne systems, a pH of 7.5-8.5 should be maintained using tertiary amines only.
CYMEL 202 resin has a shelf life of 720 days from the date of manufacture when stored at temperatures below 32°C. Although lower temperatures are not detrimental to stability, its viscosity will increase, possibly making the resin difficult to pump or pour. The viscosity will reduce again on warming, but care should be taken to avoid excessive local heat as this can cause an irreversible increase in viscosity.
Technical Details & Test Data+
CYMEL 202 resin is an effective crosslinker for backbone polymer resins containing hydroxyl, carboxyl, and amide functional groups, such as those found on alkyd, polyester or acrylic resins. Although the optimum level of CYMEL 202 resin should be determined experimentally, ratios of 25 to 35% based on resin solids are typically most effective.
CYMEL 202 resin may not require the addition of an acid catalyst to the formulation to obtain effective cure. In many instances, the acidity of the backbone polymer in the formulation is sufficient to catalyze the reaction under normal baking conditions (15-20 minutes at 120-150°C). If catalyst addition is required, then 0.5-1.0% of CYCAT® 296-9 catalyst based on total resin solids is recommended.