Bayhydur Xp2547 Alternative HDI Hardener
Characterization Bayhydur 2547 is a hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI). It is suitable as a hardener for waterborne two-component coatings, top coats, sealers and as an additive to enhance the property profile.
Description
Bayhydur XP2547 alternative HDI hardener
Bayhydur® 2547
Characterization Bayhydur 2547 is a hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI).
It is suitable as a hardener for waterborne two-component coatings, top coats, sealers and as an additive to enhance the property profile.
Characteristic data
Property Value Unit of measurement Method
Hazen color value: ≤ 150
Viscosity at 23°C 570 - 730 mPa∙s
NCO content: 22 - 23 %
Monomeric HDI: < 0.5 %
Other data
Solubility / thinnability
The product is generally compatible with organic solvents such as esters or ethers. However, solubility and compatibility should be tested in each case. Regarding the influence of the solvent (cosolvent) on the emulsibility of the polyisocyanate, please refer to the information in the section "Properties/applications". Only PU grade solvents should be used (< 0.05% water).
Properties / Applications
Because of its hydrophilic character, Bayhydur 2547 can be easily dispersed in the aqueous phase. It is used primarily as the crosslinking agent for waterborne polyol binders (Bayhydrol®). The dispersibility of the product in water is influenced by organic cosolvents. The use of highly hydrophobic or highly hydrophilic cosolvents such as butyl acetate, xylene, butyl glycol acetate, dimethyl formamide or N-methylpyrrolidone generally leads to a coarser dispersion, which may cause turbidity in the coating film dependingon the entire system. On the other hand, the use of, for example, methyl ethyl ketone, methoxypropyl acetate, dipropylene glycol dimethyl ether, propylene glycol diacetate or dicarboxylic acid diester mixtures leads to fine-particle dispersions.
Bayhydur 2547 can also be added to conventional OH-free dispersions to improve their property profiles.
As with any product, use of Bayhydur 2547 in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability
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