Covestro Desmodur Z4470 MPA/X IPDI trimer curing agent wear-resistant fast-drying curing agent

Type	Aliphatic polyisocyanate of isophorone diisocyanate
Form of Supply	about 70% in propylene glycol methyl ether acetate/xylene,1:1
Purpose	in Used as a co-reactant in alkyd resin spray coating formulations and as a hardener component in light and weather resistant coating systems

Product Specifications

Features

Value

Measurement unit

Method

Isocyanate group containsAmount

11.8±0.4

Dissolve/dilute in aromatic compounds, even without adding polar solvents, such as esters, ketones and ether esters, such as butyl etherate, methyl ethyl ketone and propylene glycol methyl ether acetate, etc. Dilute the product in the above supply form to a minimum solids content of 20% with a stabilized solvent such as xylene, toluene, higher boiling aromatics such as solvent naphtha 100 or fragrance blends. However, the storage stability of its solution must be tested. To prolong the storage time of the diluted solution, do not add aliphatic compounds. However, Desmodo Z4470 has the necessary compatibility to be added to coatings soluble in aliphatic compounds. The solvents used must be polyurethane grade solvents (< 0.05% water). Solvents must not contain reactive species such as hydroxyl or amino groups.

Compatibility
Generally speaking, Desmodu Z4470 is usually blended with the following Desmodu and Desmophen® grades. However, the compatibility of the mixture must be tested. Desmodur Z4470 is miscible with Desmodur N75, N33900, and L, and with most polyester base grades such as Desmodur 650, 651, 670, 680, 690 and RD 181 It is also miscible with Gedex acrylates A 160, A 265, A 365, A450, A 565 and A 665, as well as with many alkyd resins.

Application
de Smodur Z4470 is mainly used as an additive resin in alkyd resin spray coatings to be applied, which can speed up drying, curing and chemical crosslinking, and at the same time improve the resistance of the paint film. The optimal addition amount must be determined by experiments.
In the case of alkyds that dry by oxidation (alkyds modified with fast-drying oils or fatty acids), the result is additional crosslinking similar to the oxidative crosslinking process. Because Due to its hard resin properties, Desmodo Z4470 can improve the physical drying, curing and chemical drying of the paint film. The product must be added exactly in predetermined quantities to be used as a special spray solution. Typically the pot life of the formulated coating formulation is one working day. Weather resistance and yellowing resistance basically depend on alkyd resin. Two-component polyurethane coatings with good weather resistance can be formulated with Desmodur Z4470 and a flexible co-reactant, such as Desmodor 670.

Save
Desmodos Z4470 is sensitive to moisture. Therefore, it should be stored in an airtight container. If this product is stored under proper conditions, it can remain stable for at least half a year.

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