Description
Crosslinker SaC***0 is a **0% active, polyfunctional aziridine
liquid crosslinker. Additional of **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***0 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
%)
>*9
Viscosity Brookfield
(*5℃)
**0mPa.s
PH
(*5℃)
**9
Density
(*0℃)
1.*8kg/l
Stability
(*0℃)
6 months
Water tolerance
(%)
>**0
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***0 is a tri-functional material that
crosslinks polymers with reactive carboxyl functionality
(equivalent weight is approx.**6).
- For many applications 0.6 equivalents of SaC***0 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***0 necessary to fully
crosslink acrylic emulsions and urethane dispersions are 2% and
3%respectively(calculated on wet products).
- Crosslinker SaC***0 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***0 and water.
- In water bome formulations, SaC***0 will slowly hydrolyse
and blends should therefore be used within **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***0
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***0 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.
