Desmodur-IPDI based curing agent

Covestro Desmodur Z4470 BA IPDI trimer curing agent light fast drying curing agent

type	Aliphatic polyisocyanate (IPDI trimer)
form of supply	About 70% butyl acetate solution
About 70% butyl acetate solution	Curing component for the preparation of lightfast polyurethane coatings and as additive resin for alkyd spray paints

Specification

characteristic	Numerical value	Units of measurement	method
NCO content	11.9±0.4	%	DIN EN ISO 11909
Non-volatile component content (0.2g/1h/120°C)	70 ± 2	%	DIN EN ISO 3251
Viscosity, 23°C	600 ± 200	mPa·s	DIN EN ISO 3219/A.3
Color value (Hazen)	≤60		DIN EN 1557
free IPDI monomer	<0.5	%	DIN 55 956

Other data*

characteristic	Numerical value	Units of measurement	method
Viscosity, 25℃	about 550	mPa·s	DIN EN ISO 3219/A.3
equivalent	about 360
Flash point	34	°C	DIN 53213/1
Density@20℃	1.06	g/ml	DIN EN ISO 2811

*This data is general information and is not part of the product specification.

Solubility / dilution
Desmodur® Z4470 BA can be diluted with polar solvents esters, ketones and ether esters such as butyl acetate, methyl ethyl ketone, 1-propylene glycol methyl ether acetate-2; and with aromatic hydrocarbons. Generally, it has good compatibility with the solvents listed above, but the storage stability of the prepared solutions is still to be tested. Only urethane grade solvents should be used (less than 0.05% water, no reactive groups like hydroxyl and amino groups).
Dilute Desmodur® Z4470 BA with xylene, toluene or high boiling aromatic compounds such as naphtha 100 or aromatic mixtures to prepare stable solutions with a minimum of 20% solids. Aliphatic hydrocarbon solvents should not be added if extended storage stability of the diluted solution is required. However, Desmodur® Z4470 BA aliphatic hydrocarbon solvents have some compatibility and can therefore be added to coating systems containing aliphatic hydrocarbon solvents.

compatibility
In general, Desmodur® Z 4470BA can be mixed with the following products: aliphatic polyisocyanates such as Desmodur N100, N75, N3200, N3300, N3400 and N3600; aromatic polyisocyanates such as Desmodur® L, HL and IL; polyester polyols Such as Desmophen® 670; polyacrylates such as Desmophen® A products; alkyd resins such as Alkydal® F48. However, compatibility must be tested before mixing.

Features/Applications
Desmodur® Z4470 BA is mainly used as a curing agent in lightfast two-component polyurethane coatings. It has good chemical resistance and weather resistance, very good gloss retention and excellent mechanical properties. Due to its higher hardness, it is usually mixed with Desmodur® N products. Co-reactants are elastomeric polyacrylate polyols such as Desmophen® A565 and A575 and polyester polyols such as Desmophen® 670. Two-component coatings based on Desmodur® Z4470 BA are mainly used in automotive OEM and automotive refinishes. Due to its very good physical drying properties, Desmodur® Z4470 BA is also used as an auxiliary resin in alkyd spray coatings to accelerate drying. The main application of this coating is in automotive refinish and industrial paints.

store
This product is sensitive to moisture and should be stored in original Covestro airtight containers. The shelf life of this product is at least 6 months when stored under proper conditions at room temperature.