CYMEL® 327-70
- CASE Ingredients Functions
- Crosslinking Agent
- Chemical Family
- Amino Resins
CYMEL® 327-70 resin is a 70% solid, diluted version of CYMEL® 327 resin, achieved by incorporating butyl cellosolve. Notably, the chemical structure of CYMEL® 327-70 resin mirrors that of CYMEL® 327 resin. Functioning as a methylated high-imino melamine crosslinker in iso-butanol, it exhibits high reactivity and tends towards self-condensation during normal baking temperatures. This unique property contributes to films with excellent hardness, gloss, chemical resistance, and outdoor durability. Particularly advantageous in high-solids formulations, CYMEL® 327-70 resin stands out for its potential to reduce VOC levels. Its primary function is as a crosslinking agent, and it finds application in automotive OEM coatings.
Properties
- Physical Form
- Liquid
Product families
Applications
- Automotive OEM Coatings
- Automotive OEM Coatings
Product Families
- Chain Extenders & Crosslinkers
Other characteristics
- Brand
- CYMEL
- End Uses
- Waterborne Coating
- Functions
- Crosslinking Agent
- Markets
- Automotive & Transportation
- Paints & Coatings
- Catalysis
CYMEL 327-70 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.
- Stability
FORMULATION STABILITY; The stability of solvent-borne systems containing CYMEL 327-70 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.; STORAGE STABILITY; CYMEL 327-70 resin has a shelf life of 450 days from the date of manufacture when stored at temperatures between 5°C and 25°C. Although low 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.
- Appearance
- Clear Liquid
- Shelf LIfe
- 450 Days
- Coating Type
- Waterborne Coating
- Insoluble In
- Aliphatic Hydrocarbons
- Technology
- CASE Ingredients
- HIGHLIGHTS
- BENEFITS
- Low viscosity
- Fast cure response
- Low formaldehyde release
- APPLICATION AREAS
- High solids coatings
- Waterborne coatings
- Coil coatings and metal decorating
- Partially Soluble in
- Aromatic Hydrocarbons
- Backbone Polymer Selection
CYMEL 327-70 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 327- 70 resin should be determined experimentally, ratios of 25 to 35% based on resin solids are typically most effective.
- Compatibility and Solubility
- SOLUBILITY
- COMPATIBILITY
- Compatible Substrates and Surfaces
- Metal
Technical data
Table 1 of 1
5 rows| Characteristic | Value | Unit |
|---|---|---|
| Solvent | Iso-butanol, Butyl Cellosolve | — |
| Color | max. 70 | APHA |
| Non-Volatile Content | 68.5-71.5 | %wt |
| Free Formaldehyde Content | max. 1.5 | % |
| Viscosity (23°C) | 2500-3400 | mPa.s |
