YL-W6700B is a hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate; Curing agent component used as waterborne two-component polyurethane coating system.
Properties
| Appearance | Water white or yellowish transparent liquid |
| Isocyanate content /% | 20.5±0.5 |
| Non-volatile matter /% | 100 |
| HDI monomer content /% | ≤0.4 |
| Viscosity /(cps， 25℃) | 4400~6400 |
Other data
The following are typical features of YL-W6700B and should not be considered as product specifications.
| Item | Typical data |
| Average mol wt | About 688 |
| Relative density /（g/cm3， 25℃） | 1.15~1.17 |
| Flash point /℃ | About 208℃ |
Solubility
Yl-W6700B is compatible with ester, ether ester, xylene and naphtha 100 solvents; however, solubility and compatibility should be tested for each solvent. Only polyurethane grade solvents should be used. The water content shall not exceed 0.05% and does not contain active groups such as hydroxyl or amino.
Applications
YL-W6700B is a crosslinking agent suitable for water-based systems, which should have good combination stability and chemical resistance; Although the hydrophilic property of the curing agent is relatively weak, it is easy to emulsify in the aqueous phase, even in the case of the common commercial shear force. The paint prepared with this product can form a high gloss and low fog film.
The water-based two-component polyurethane coating prepared with YL-W6700B can be diluted with water in advance or added with a small amount of highly hydrophilic co-solvent to control the viscosity and improve the permeability of the paint film. The product is characterized by high hardness, good physical performance and excellent chemical resistance.
YL-W6700B can also be used as a crosslinking agent for waterborne polyols and most neutral waterborne polymer dispersions (such as polyurethane, polyvinyl acetate, polyacrylate and synthetic rubber dispersions).
After adding YL-W6700B, the two-component coating to be used must be used within the activation period. The activation period is affected by polymer content and other components (e.g. resins, thickeners, plasticizers, etc.). In many dispersions, the end point of activation period (usually several hours) does not show gelation.
Packaging and storage
| Package specification | 20L, 60L or 200L small mouth iron barrel, other packaging specifications can also be agreed |
| Storage | Please keep it away from light, cool and dry place. The storage temperature should be 5~30 ℃ to keep the package intact and sealed well. The shelf life of this product is 6 months from the date of production. It is recommended to evaluate the performance before use after more than 6 months. |
Security
This product contains polyisocyanate, so you should be very careful when using it. Skin contact with this product may cause allergic reaction; all YL-W series products are very sensitive to moisture and react with water to form carbon dioxide and insoluble urea. Therefore, the packaging container must be well sealed to avoid reaction with moisture, solvent and moisture in the container. The carbon dioxide produced will increase the pressure of the container, thus increasing its risk.
