Effects of the Acrylic Polyol Structure and the Selectivity of the Employed Catalyst on the Performance of Two-component Aqueous Polyurethane Coatings

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 polyurethane application, by using more selective catalysts. The aliphatic polyfunctional isocyanates based on hexamethylen diisocyanates have been employed as suitable hardeners. The complex 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 as catalysts in this study. Both of the aqueous polyols give good results, in terms of application and hardness, when elevated temperatures and more selective catalysts are applied. A more selective catalyst promotes the reaction between the isocyanate and polyol component. This increases the percentage of urethane bonds and the degree of hardness in the films formed from the two components of aqueous polyurethane lacquers. The polyol based on the single step synthesis route is favourable concerning potlife and hardness. The obtained results show that the performance of the two-component aqueous polyurethane coatings depends on the polymer structure of the polyols as well as on the selectivity of the employed catalyst.

Mn(III) O^N^O Complexes as Water‐tolerant and Environmentally Benign Catalysts for Polyurethane Foam Synthesis

“…However, in presence of coordinating solvents, coordination of these ancillary ligands is possible and results in the formation of the octahedral species in the solid state. In addition, mass spectroscopic analysis indicated dimerization of these species 4), Fe2À O47 1.900(4), Fe2À O37 2.051(3), Fe2À O17 2.078(3), Fe2À N6 2.132(4), Fe2À N4 2.136(4), O2À Fe1À O3788.55( 14), O2À Fe1À O17 91.33( 13), O37À Fe1À O17 77.56( 13), O27À Fe2À O47 105.37 (17), O27À Fe2À O37 94.09( 15), O47À Fe2À O37 153.38 (15), O27À Fe2À O17 154.52 (15), O47À Fe2À O17 92.94 (15), O37À Fe2À O17 75.32 (13), O47À Fe2À N686.57 (15), O17À Fe2À N6 112.54( 14), O27À Fe2À N4 85.08 (17), O17À Fe2À N4 76.51( 15), N6À Fe2À N4170.90( 17) 3), Fe1À O4 2.008(4), Fe1À O3 2.075(4), Fe1À N1 2.089(4). O2À Fe1À O1 168.18 (15), O2À Fe1À O5 99.17 (15), O1À Fe1À O5 92.43 (14), O2À Fe1À O4 91.30 (17), O1À Fe1À O4 91.56(15), O5À Fe1À O4 87.03 (15), O2À Fe1À O3 88.48 (17), O2À Fe1À N1 88.64( 16), O1À Fe1À N1 79.62 (16), O5À Fe1À N1 171.11( 16) ); (9) Fe1À O10 1.913(4), Fe1À O12 1.971(4), Fe1À O19 1.979(4), Fe1À O16 1.998(4), Fe1À O26 2.095(4),Fe1À N2 2.134(4), O10À Fe1À O12 99.81( 16), O10À Fe1À O19 164.90( 16), O12À Fe1À O19 94.76( 16), O10À Fe1À O16 93.06 (17),O19À Fe1À O16 91.41 (17), O12À Fe1À O26 81.75( 16), O19À Fe1À O26 88.83 (15), O10À Fe1À N2 86.44 (16), O12À Fe1À N2 173.61 (16) which also serves as another route in obtaining the more stable octahedral species.…”

The new polyol architecture from olive oil and its application in the soft transparent polyurethane coating

“…On the other hand, concerns have been raised about the use of petrochemical derivatives due to the exhaustion of fossil feedstock [19][20][21], undesirable characteristics such as low degradability rate [22] global warming [23] and their volatile organic compounds (VOC) [24,25]. To address this, renewable raw materials was replaced with oil derivatives.…”

Highly transparent castor oil‐derived polyurethane/silica nanocomposite coating synthesized by in situ polymerization

“…4 Conventional two-component polyurethane systems (2C-PU) have unique cross-linking chemistry and are bestowed with excellent outdoor durability, outstanding chemical resistance, and good mechanical properties. 5,6 Currently, PU-based coating materials are primarily prepared from petroleum-based feedstocks which affect the production process due to the supply chain environmental effects and cost of crude oil prices. 7 Vegetable oils are derived from renewable resources which have generated considerable research interest in the current years.…”

“…The clear coat provides a protective coating against environmental effects, corrosion, and UV light 4 . Conventional two‐component polyurethane systems (2C‐PU) have unique cross‐linking chemistry and are bestowed with excellent outdoor durability, outstanding chemical resistance, and good mechanical properties 5,6 . Currently, PU‐based coating materials are primarily prepared from petroleum‐based feedstocks which affect the production process due to the supply chain environmental effects and cost of crude oil prices 7 .…”