CYMEL® UB-24-BX Resin

CYMEL® UB-24-BX is a partially n-butylated urea crosslinker supplied in a mixture of n-butanol and xylene. It is primarily used as a crosslinking agent in industrial primer formulations where electrostatic spray application is required. Here are the key details about CYMEL® UB-24-BX:

Product Description:

• CYMEL® UB-24-BX resin facilitates fast reaction speed and film hardness development.
• It is supplied in a mixture of n-butanol and xylene.

Benefits:

• Very fast reaction speed.
• Good adhesion properties.
• Very high electrostatic resistivity.

Application Areas:

• General industrial baking formulations.
• Primer formulations.
• Electrostatic spray application.

Physical Properties:

• Appearance: Clear liquid.
• Non-volatile by wt: 63 ± 2%.
• Viscosity at 23°C: 1700 – 2600 mPa.s.
• Free formaldehyde: ~0.4%.
• Color (APHA): < 50.

Solubility:

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

Compatibility:

• Medium compatibility with acrylic resins.
• Very good compatibility with alkyd resins.
• Good compatibility with polyester resins, nitrocellulose, cellulose acetate butyrate, and polyvinyl butyrate.

Backbone Polymer Selection:

• Effective crosslinking agent for backbone polymer resins containing hydroxyl, carboxyl, and amide functional groups, such as alkyd, polyester, or acrylic resins.
• Typically effective at ratios of 25 - 35% based on resin solids.

Catalysis:

• In baking enamels, may not require additional acid catalyst due to the acidity of the backbone polymer.
• If catalyst addition is needed, recommended catalysts include CYCAT® 4040 or CYCAT® 296-9 at 0.5 - 1.0% based on total resin solids.

Formulation Stability:

• Stability can be enhanced by the addition of alcohols or amines.
• Recommended stabilizers include low molecular weight primary alcohols (such as n-butanol) and amines like TEA, DMEA, or 2-AMP.

Storage Stability:

• Shelf life of 24 months from the date of manufacture when stored at temperatures between 5°C and 30°C.
• Excessive local heat should be avoided as it can cause irreversible viscosity increase.

In summary, CYMEL® UB-24-BX is a versatile crosslinker offering fast reaction speed, good adhesion, and high electrostatic resistivity, suitable for various industrial coating applications.