CYMEL® 327 Resin

CYMEL® 327 is a methylated high imino melamine crosslinker supplied in iso-butanol. Here's a breakdown of its technical datasheet:

Product Description:

• CYMEL® 327 is highly reactive and tends towards self-condensation at normal baking temperatures.
• It provides films with very good hardness, gloss, chemical resistance, and outdoor durability.
• It offers the advantage of potentially lowering VOC in high solids formulations.

Benefits:

• High solids content
• Fast cure response
• Low formaldehyde release

Application Areas:

• High solids coatings
• Waterborne coatings
• Coil coatings and metal decorating
• Automotive coatings

Physical Properties:

• Appearance: Clear Liquid
• Non-volatile by weight: 88-92%
• Viscosity at 23°C: 5100-16000 mPa∙s
• Free formaldehyde: < 0.5%
• Color, APHA: ≤ 50
• Density at 23°C: 9.70-9.90 lbs/gal

Solubility:

• Complete solubility in alcohols, esters, ketones, and water.
• Partial solubility in aromatic hydrocarbons.
• Insoluble in aliphatic hydrocarbons.

Compatibility:

• Very good compatibility with acrylic, alkyd, epoxy, and polyester resins.

Backbone Polymer Selection:

• Effective crosslinker for backbone polymer resins containing hydroxyl, carboxyl, and amide functional groups, such as alkyd, polyester, or acrylic resins.
• Optimum level typically ranges from 25 to 35% based on resin solids.

Catalysis:

• May not require the addition of an acid catalyst in many formulations due to the acidity of the backbone polymer.
• If catalyst addition is needed, CYCAT® 296-9 catalyst is recommended at 0.5 - 1.0% based on total resin solids.

Formulation Stability:

• Stability of solvent-borne systems can be enhanced with primary alcohols, amines, or a combination.
• Low molecular weight primary alcohols like ethanol or n-butanol are effective, along with amines like TEA or DMEA.
• For waterborne systems, maintaining a pH of 7.5 - 8.5 using tertiary amines is recommended.

Storage Stability:

• Shelf life of 720 days when stored below 32°C.
• Viscosity may increase at low temperatures but will reduce again on warming. Excessive local heat should be avoided to prevent irreversible viscosity increase.