Knowde Enhanced TDS
Identification & Functionality
- CASE Ingredients Functions
- Technologies
Features & Benefits
- Product Highlights
BENEFITS
- Fast low temperature cure response
- Superior humidity and water resistance
- Lower VOC than conventional butylated melamine resins
APPLICATION AREAS
- Automotive primer/surfacer
- Automotive basecoat
Applications & Uses
- Applications
- 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 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 | 70.5± 2 | %wt | — |
| Free Formaldehyde Content | max.1.0 | % | — |
| Viscosity (25°C) | V-Z1 | — | — |
Technical Details & Test Data
- Backbone Polymer Selection
CYMEL 250 resin is an efficient cross-linking agent for hydroxyl, amide, carboxyl, functional polymers or resins. Similar to other melamine resins with reactive functions, it is not only crosslinks with the above functionalities, but also selfcondenses readily.
- Catalysis
CYMEL 250 resin responds to catalysis by weak acids. At baking temperatures above 120°C, the carboxyl functionality of the other resins in a formulation would be an adequate catalyst. If catalyst is necessary, any soluble acid would be effective. Normally, phosphate esters such as CYCAT 296-9 are recommended. The acid concentration would have been determined for each system.
- Stability
FORMULATION STABILITY
The stability of solvent-borne systems containing CYMEL 250 resin can be enhanced by the addition of primary alcohols, amines, or a combination of these. Low molecular weight primary alcohols such as ethanol and n-butanol are most effective. Recommended amines are TEA, DMEA or 2-AMP at a concentration of 0.5-1.0% on total binder solids.
STORAGE STABILITY
CYMEL 250 resin has a shelf life of 1 year from the date of manufacture when stored at temperatures between 5°C and 30°C packed in unopened original containers .CYMEL 250 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
- 1 year