Properties and Applications
VESTANAT B 1358/100 is a blocked cycloaliphatic polyisocyanate for crosslinking of suitable hydroxylated resins, like polyester, acrylic and alkyd resins.
The solvent-free form of delivery offers a great choice of possible solvents to be used and therefore the optimizing of many paint formulations.
Solutions in water-soluble solvents simplify the formulations of water-based 1K PUR stoving systems.
Dissolved in plasticizers, VESTANAT B 1358/100 can also be used for modifying of PVC or other thermoplastic materials.
In principle it is possible to formulate PUR stoving paints which cure at temperatures ≥ 130℃.
The properties of the cured coatings are decisively determined by the polyols employed. Due to the fact that VESTANAT B 1358/100 imparts hard segments into a coating, it might be necessary to use additionally flexibilizing polyols. Recommendations are available on request.
VESTANAT B 1358 is also available as a 63 pbw.solution in aromatics 100(VESTANAT B 1358 A,Product Information no. 43.13.017e).
| Specification | |||
| Property | Value | Unit | Test method |
| Free NCO content | <0.5 | % wt | ISO 11 909 ASTM D 2572 |
| Total NCO content | 12.3-12.9 | % wt | ISO 11 909 (modified) |
| Typical data | |||
| Solids content | 100 | % by wt. | - |
| Splitting temperature | approx.130 | ℃ | - |
| Melting range | 115-130 | ℃ | DIN 53 181 |
| Bulk density | 580-600 | kg/m3 | DIN 53 466 |
| Ignition temperature | 350 | ℃ | DIN 51 794 |
Solubility
VESTANAT B 1358/100 is soluble in most types of common solvents, such as ketones, esters, aromatics, alcohols,glycolethers, glycol ether esters, etc.The compatibility with white spirit is limited.
The dissolving of VESTANAT B 1358/100 in an alcohol containing solvent should be performed at a maximum temperature of 80℃, in OH-free solvents at a maximum of 100℃.
We suggest the following procedure for dissolving: Approx. 30 % of the VESTANAT B 1358/100 should be added to the preheated solvent(80-100°C) under vigorous stirring.Within 30 -60 min the remainder of
VESTANAT B 1358/100 is added by stirring continuously.The time for complete dissolution depends on the type of solvent and the equipment. The dissolving time can be shortened by prepulverizing the
VESTANAT B 1358/100.
Filtration through a 10 um filter is recommended.
Curing/catalysis
In conventional solvent-based formulations the use of tin catalysts, like DBTDL, is recommended in concentrations of 0.2-0.5 % by wt.calculated on resins. The resulting curing conditions are - depending on the reactivity of the polyol-30 min to 60 min at 130℃(see also Product Information VESTANAT B 1358 A, no. 43.13.017e).
Tin catalysts are not very effective when used in waterborne systems. A minimum curing cycle of 30 min 140-150℃ is expected.
Storage and Packaging
VESTANAT B 1358/100 can be stored in unopened containers for at least one year without loss of quality in accordance with the above specification.
VESTANAT B 1358/100 is supplied in non returnable drums holding 70 kg (120 I).
Safety and Handling
Please refer to our Material Safety Data Sheet.
