Bayhydur-waterborne PU curing agent

Covestro Bayhydur VPLS 2150BA Hydrophilic IPDI polyisocyanate curing agent

type	Hydrophilically modified aliphatic polyisocyanates based on isophorone diisocyanate (IPDI)
form of supply	About 70% in butyl acetate
use	As co-reactant for waterborne resins, curing agent for chemical and weather resistant coatings

Product Specifications

characteristic	Numerical value	Units of measurement	method
NCO content	9.4±0.5	%	DIN EN ISO 11 909
Non-volatile content	70±2	%	DIN EN ISO 3251
Viscosity@23°C	500±200	mPa.s	DIN EN ISO 3219/A.3
Color value	≤60		DIN EN1557
Isocyanate monomer content	＜0.5	%	DIN 55 956

Other data*

characteristic	Numerical value	Units of measurement	method
equivalent	about 447
Density, 20°C	about 1.06	g/cm3	DIN EN ISO 2811
Flash point	about 27	°C	DIN EN ISO 1523

Solubility / dilution
Bayhydur® VP LS 2150 BA can be completely dissolved/diluted in compounds such as butyl glycol acetate and butyl diethylene glycol acetate or aromatic hydrocarbons without the addition of polar solvents such as esters, ketones and ether esters . The product can be diluted to a stable solution with a minimum solids content of 20%, for example with xylene, toluene or higher boiling aromatic compounds such as naphtha No. 100 solvent or a mixture of aromatic compounds. However, it is recommended to test the solution for storage stability. Aliphatic (gasoline) solvents cannot be added during dilution if the dilution is to be stored for a long time. However, Bayhydur® VP LS 2150 BA is compatible with aliphatic compounds and can be added to coatings containing aliphatic solvents. Polyurethane grade solvents should be used (less than 0.05 % water). The solvent cannot contain reactive groups such as hydroxyl or amine groups.

compatibility
In general, Bayhydur® VP LS 2150BA can be mixed with Desmodur®, Bayhydur® and Bayhydrol® products listed below. However, the entire formulation must be tested for compatibility (including solids content, co-solvent content, co-solvent type). Desmodur® N3300, N3600, Bayhydur® 3100, most Bayhydrol® products such as Bayhydrol® VP LS 2054, VP LS 2058, VP LS 2231, A 145, XP 2470 and XP 2469.

Features/Applications
Within the Bayhydrol® product range, Bayhydur® VP LS 2150 is primarily used as a co-reactant for aqueous polyol binders. Due to its hydrophilic nature, Bayhydur® VP LS 2150 is easily emulsified in the aqueous phase. The addition of Bayhydur® VP LS 2150 BA improves the properties of waterborne two-pack polyurethane coatings such as chemical and solvent resistance.