Crosslinker SaC-100 is a 100% active, polyfunctional aziridine liquid crosslinker. Additional of 1-3% to water based acrylic emulsions or urethane dispersion produces a marked improvement in water, chemical, abrasion and humidity resistance and enhances adhesion to specific substrates. Crosslinker SaC-100 is room temperature reactive and therefore can be used under air and forced drying conditions.
Typical properties
Type                                   polyfunctional aziridine crosslinker
Appearance                             clear yellowish liquid
Total solids (w/w %)                      >99
Viscosity Brookfield (25℃)                200mPa.s
PH (25℃)                               8-9
Density (20℃)                           1.08kg/l
Stability (20℃)                           6 months
Water  tolerance (%)                     >100
Solubility                                complete in acetone, xylene, isopropanol n-butyl acetate, carbitol, butyl carbitol
Recommendations for end-use
-               In water based parquet lacquers to improve water, alcohol, detergent, chemical and abrasion resistance.
- In water based industrial wood-, plastic- and metal coatings to increase water, alcohol and block resistance.
- In vinyl coatings to reduce plasticizer migration and improve stain resistance.
- In water based concrete sealers to improve abrasion resistance.
- Generally, to improve adhesion of water based systems to non-polar substrates.
- In solvent based polymers to increase resistance properties.
- In water based printing inks to improve water and detergent resistance.
Formulating guidelines
- Crosslinker SaC-100 is a tri-functional material that crosslinks polymers with reactive carboxyl functionality (equivalent weight is approx.166).
- For many applications 0.6 equivalents of SaC-100 per carboxyl equivalent are sufficient to achieve optimum improvement in film properties.
- However some systems may require the full stoichiometric equivalent of crosslinker.
- Typical addition levels of SaC-100 necessary to fully crosslink acrylic emulsions and urethane dispersions are 2% and 3%respectively(calculated on wet products).
- Crosslinker SaC-100 should be added to lacquers, paints or inks prior to use and due to its excellent water miscibility it can be stirred in by hand.
- The best method of addition is by using a 1:1 premix of SaC-100 and water.
- In water bome formulations, SaC-100 will slowly hydrolyse and blends should therefore be used within 3-5 days after preparation. The hydrolised products have no adverse effects on the emulsions nor on the dried films, and additional crosslinker may be added to restore reactivity.
- Solvent based systems modified by the addition of SaC-100 must be used within 5 days because they tend to thicken and may gel within 2 weeks.
Handling
Care must be taken to avoid any contact with the skin and eyes.
When used in spray applications, particular care must be taken to avoid oral and/or nasal ingestion by wearing a suitable respirator. When handling SaC-100 it is desireable to prevent inhalation of vapours by proper ventilation or respirator use.
See our Material Safety Data Sheet for specific information.
Storage
Store in a cool, dry, dark place. If stored under conditions of excessive heat for extended periods the material may discolour, deteriorate and gel.