CYMEL® 251 Resin

1 of 102 products in this brand
CYMEL® 251 Resin serves as a crosslinking agent in the CASE Ingredients sector, falling under the monomers and intermediates and chain extenders and crosslinkers categories. Specifically curated for automotive and transportation and paints and coatings sectors, this clear liquid is apt for applications such as marine coatings within the mentioned markets. It harmoniously blends with acrylics, alkyds, epoxies (EP), and polyesters. Designed for waterborne coating applications, its consistency and clarity make it a preferred choice.

Functions: Crosslinking Agent

Compatible Polymers & Resins: Acrylics, Alkyds, Epoxies (EP), Polyesters

End Uses: Waterborne Coating

Technical Data Sheet
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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

Compatible Polymers & Resins
Coating Type

Properties

Physical Form
Appearance
Clear Liquid
Partially Soluble in
Water
Typical Properties
ValueUnitsTest Method / Conditions
SolventN-butanol
Colormax. 1Gardner
Non-Volatile Content80 ± 2%wt
Free Formaldehyde Contentmax. 1.3%
Viscosity (25°C)V-Z3
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

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