Knowde Enhanced TDS
Identification & Functionality
- CASE Ingredients Functions
- Technologies
Features & Benefits
- Product Highlights
BENEFITS
- Low viscosity / high solids
- Rapid cure response
- Does not require strong acid catalyst
- Excellent water resistance and appearance properties
APPLICATION AREAS
- Waterborne coatings
- Automotive basecoats
- General industrial high solids and water-reducible coatings
Applications & Uses
- Applications
- Compatible Polymers & Resins
- Coating Type
Properties
- Physical Form
- Appearance
- Clear Liquid
- Partially Soluble in
- Water
- Typical Properties
- Solubility & Compatibility
SOLUBILITY
Alcohol Complete Esters Complete Ketones Complete Aromatic hydrocarbons High Glycols Complete Glycol ethers Complete Water Insoluble COMPATIBILITY
Acrylic resins Very good Alkyd resins Very good Polyester resins Very good Epoxy resins Very good
Value | Units | Test Method / Conditions | |
Solvent | N-butanol | — | — |
Color | max. 1 | Gardner | — |
Non-Volatile Content | 80 ± 2 | %wt | — |
Free Formaldehyde Content | max. 1.3 | % | — |
Viscosity (25°C) | V-Z3 | — | — |
Technical Details & Test Data
- Backbone Polymer Selection
CYMEL 251 resin constrains a combination of butoxymethyl and methoxymethyl functionalities, making it an effective crosslinking agent for backbone polyesters such as alkyds, polyesters and acrylics contains hydroxyl or amide functionality. In addition to entering into crosslinking reactions, CYMEL 251 resin also has a high tendency toward self-condensation. Therefore, its practical equivalent weight, on a solids basis, is in the range of 200-280. Typical use levels of CYMEL 251 resin are between 25% and 35% of total resin solids, however, the appropriate use level in a particular formulation should be determined experimentally.
- Catalysis
CYMEL251 resin usually does not require the addition of a strong acid catalyst to the formulation in order to obtain effective cure at common baking temperatures. In many instances, the acidity of other formulation components is sufficient to catalyze reaction. If catalyst addition is required, use of a weak inorganic acid catalyst such as CYCAT 296-6 catalyst at a level of 1.0-2.0 wt. % (as supplied) based on total binder solids is recommended for baking schedules of 100-150℃ for 15-20minutes.
- Stability
FORMULATION STABILITY
The stability of formulated systems containing CYMEL 251 rein can be enhanced by the addition of alcohols, amines or a combination of these. Low molecular weight primary alcohols such as methanol and n-butanol are most effective. Recommended amines are tertiary amines such as tri-ethylamine of dimethyl ethanolamine at a concentration of 0.5-1.0% on total binder solids.
STORAGE STABILITY
CYMEL 251 resin has a shelf life of 18 months from the date of manufacture when stored at temperatures between 5°C and 30°C packed in unopened original containers .CYMEL 251 resin must be kept indoors and avoided the direct sunlight exposure. 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.
Storage & Handling
- Shelf Life
- 18 months