Knowde Enhanced TDS
Identification & Functionality
- CASE Ingredients Functions
- Technologies
Features & Benefits
- Product Highlights
BENEFITS
- Very fast reaction speed
- Adhesion to metal substrates
- High flexibility
APPLICATION AREAS
- General industrial bake finishes
- Primer formulations
- Dipping enamels
Applications & Uses
- Markets
- Application Method
- Compatible Polymers & Resins
- Coating Type
Properties
- Physical Form
- Appearance
- Clear Liquid
- Insoluble in
- Water
- Partially Soluble in
- Aliphatic Hydrocarbons
- Typical Properties
- Solubility & Compatibility
SOLUBILITY
Alcohol Complete Esters Complete Ketones Complete Aromatic hydrocarbons Complete Aliphatic hydrocarbons Partial Water Insoluble COMPATIBILITY
Acrylic resins Medium Alkyd resins Good Polyester resins Good Epoxy resins Good
| Value | Units | Test Method / Conditions | |
| Color | max. 50 | APHA | — |
| Non-Volatile Content | 49-55 | %wt | — |
| Free Formaldehyde Content | max. 1.5 | % | — |
| Viscosity (23°C) | 1700-4500 | mPa.s | — |
| Viscosity (25°C) | X-Z1 | — | — |
Technical Details & Test Data
- Backbone Polymer Selection
CYMEL U-227-8 resin contains a combination of butoxymethyl and methylol functionalities, making it a very effective crosslinking agent for backbone polymers containing hydroxyl, carboxyl, and amide functionality. In addition to entering into crosslinking reactions, CYMEL U-227-8 resin also has a tendency toward self-condensation. Therefore, its practical equivalent weight, on a solids basis, is in the range of 200-280. Increasing the level of CYMEL U-227-8 resin in a coating formulation will generally increase the hardness and chemical resistance of the cured film, although higher levels may also increase brittleness. The optimum level in a particular formulation should always be determined experimentally.
- Catalysis
As with other urea-formaldehyde resins, CYMEL U-227-8 resin may not require the addition of an acid catalyst to the formulation in order to obtain effective cure. In many instances, the acidity of other formulation components is sufficient to catalyze reaction. If catalyst addition is required, then 0.5-1.0% of either CYCAT® 4040 catalyst or CYCAT 296-6 catalyst, based on weight of total binder solids, is recommended for normal bake schedules (15-20 minutes at 120- 150°C).
- Stability
FORMULATION STABILITY
The stability of formulated systems containing CYMEL U-227-8 resin can be enhanced by the addition of alcohols, tertiary amines or a combination of these. Low molecular weight primary alcohols such as ethanol and n-butanol are most effective. Recommended amines are TEA or DMEA at a concentration of 0.5- 1.0% on total binder solids.
STORAGE STABILITY
CYMEL U-227-8 resin has a shelf life of 1440 days from date of manufacture when stored at temperatures below 32°C. Although low temperatures are not detrimental to stability, the viscosity of the product will increase making the resin more difficult to pump or pour. Product viscosity can be returned to normal by gentle warming, however, care should be taken to avoid excessive localized heating as this can cause an irreversible increase in viscosity.
Storage & Handling
- Shelf Life
- 1440 Days