Improve your performance with Stahl Carbodiimide Crosslinkers (CDI)Scroll down to read more
Improved performance with Carbodiimide Crosslinkers (CDI)
Crosslinkers help to improve performances like adhesion, toughness, abrasion and chemical resistance. Reactive groups of traditional crosslinkers make them harmful, irritant, sensitizing or even toxic to humans or to the environment. Compared to traditional crosslinkers, such as aziridine, isocyanates, and melamines, polycarbodiimide crosslinkers have a number of advantages.
Stahl Polymers new carbodiimide crosslinkers set a new standard, being the most sustainable, safe and easy-to-use option for high-performance crosslinking. Stahl Polymers recently had the privilege to support some leading global coating producers to make a successful transition from traditional isocyanates and aziridines towards the carbodiimide technology.
Carbodiimides are defined as non-hazardous under GHS (Global Harmonized System), and most of Stahl Polymers portfolio is Swiss Ordinance compliant for indirect food contact applications. Carbodiimides react at low temperature and offer extended pot life, which make them easy-to-use to formulate high-performance inks, paints and coatings, from do-it-yourself to high-end industrial applications.
Often used isocyanate crosslinkers have the disadvantages of having a limited pot life and high-sensibility to moisture. Aziridines have also been the standard for performant crosslinking for a long time. However, their use is decreasing enormously in specific applications due to their toxicity, handling limitations and serious health risks for employees and customers. Even the latest aziridine market developments are still classified.
How does Crosslinking work?
Crosslinking is in fact connecting the polymers through reactive chemistry, this makes sure it strengthens the network of a specific coating. In the case of polycarbodiimides, each molecule contains many reactive groups (-N=C=N-) and reacts with multiple polymer chains, that results in a 3D polymer-crosslinker network via covalent chemical bonds.
Polycarbodiimides (CDI) selectively react with carboxylic acid (-COOH) groups in polymer chains. Due to the high reactivity, crosslinking reaction can take place at room temperature.
Key Benefits of Carbodiimide Crosslinkers
- Low toxicity reduces labeling requirements
- Improve chemical and scratch resistance
- Quick and efficient processing: crosslinks at room temperature don’t need stoving
- Outstanding adhesion to wide range of substrates
- Excellent pot life: up to several weeks depending on the pH
- Swiss ordinance compliant for indirect food contact
Crosslinkers chemistries overview
Carbodiimide crosslinkers are an excellent alternative to more hazardous crosslinkers. In addition, standard carbodiimides are not sensitive to the presence of water and are able to achieve long pot life. In adapted pH conditions, carbodiimides can be stable in formulation for several weeks.
|Reacts with||-COOH||-OH||-OH, -NH, Water||-COOH|
|Pot life||Up to 12 hours||Very long||1 to 6 hours||Up to several weeks|
|R-phrases||Muta Cat. 3, R68, R43, R41, R38||Carc. Cat 2, R43/45/52/53||R43, R52/53||None|
|Moisture sensitivity||High||Low||Very high||Low|
|Compatibility glossy resin||Good||Good||Medium||Good|
* Not all products have all properties
Carbodiimide crosslinkers potfolio overview
||Type||Solids (%)||Viscosity (cP)
||Solvent system||VOC (%)
||Swiss Ordinance comptiant*
||Label on product**
|Picassian® XL-701||Multifunctional||50||25 - 300||MPA||49.9||Yes|
|Picassian® XL-702||Standard||40||25 - 300||H2O||0||Yes||-|
| Picassian® XL-721
||Standard||40||0 - 500||H2O
||50||50 - 400||PGDA||48.1||Yes||-|
||100||500 - 2,000||-||0.5||No|
|Picassian® XL-752||Standard||30||0 - 150||H2O
|Picassian® XL-755||Multifunctional||100||6,000 - 12,000||-||0||Yes||-|
| Picassian® XL-762
||Standard||100||15,000 - 20,000||-||0||No||-|
* For indirect food contact
** Labeling due to solvent or additive, not because of CDI polymer
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