Abstract
Two kinds of aqueous acrylic polyols (single step and multi step synthesis type)have been investigated for their performance in the two-component aqueous polyurethaneapplication, by using more selective catalysts. The aliphatic polyfunctional isocyanatesbased on hexamethylen diisocyanates have been employed as suitable hardeners. Thecomplex of zirconium, commercially known as K-KAT®XC-6212, and manganese (III)complexes with mixed ligands based on the derivative of maleic acid have been used ascatalysts in this study. Both of the aqueous polyols give good results, in terms of applicationand hardness, when elevated temperatures and more selective catalysts are applied. A moreselective catalyst promotes the reaction between the isocyanate and polyol component. Thisincreases the percentage of urethane bonds and the degree of hardness in the films formedfrom the two components of aqueous polyurethane lacquers. The polyol based on the singlestep synthesis route is favourable concerning potlife and hardness. The obtained resultsshow that the performance of the two-component aqueous polyurethane coatings depends onthe polymer structure of the polyols as well as on the selectivity of the employed catalyst.
Highlights
Conventional two-component polyurethane systems (2C-PU) are successfully used in various applications
The presented results show that the performances of the aqueous two-component polyurethane coatings depend on the polymer structure of the polyols and on the selectivity of the employed catalyst
The polyol based on the single step synthesis route improves the potlife and hardness
Summary
Conventional two-component polyurethane systems (2C-PU) are successfully used in various applications. The unique crosslinking chemistry, based on the addition reaction of OH functional binders with polyisocyanate hardeners, results in high-molecular weight of polyurethanes with excellent outdoor durability, outstanding chemical resistance and very good mechanical properties. The main aspect in the development of the polyurethanes is, in the first place, to find methods for preventing the undesired secondary reactions with water and for achieving the best crosslinking This reaction is reduced to a minimum by use of the non-tin catalysts. The objective of this work has been to study the effects of the synthesis route of the aqueous acrylic polyols as well as of the selectivity of the employed catalyst on the applications in the two-component aqueous polyurethane systems
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