Polyurethane powder coatings crosslinked with allophanate structures containing polyisocyanates

Abstract

With the use of alicyclic diisocyanates, aliphatic alcohols and dibutyltin dilaurate as well as triethylamine as a catalysts internally-blocked polyisocyanate crosslinkers which contained allophanate bonds were synthesized. The chemical structure of those compounds were characterized by IR, 1 H-NMR, and 13 C-NMR spectroscopy. Their molecular weight distribution (MWD) parameters were determined by gel permeation chromatography (GPC). Those blocked polyisocyanates were used for the production of ecological lacquer compositions and coatings. The unblocking and curing reactions were investigated on the DTA, TG, and DSC thermograms. The resulting powder lacquers exhibit an excellent appearance; they are transparent, smooth, and nonyellowing. V C 2010 Wiley Periodicals, Inc. J Appl Polym Sci 116: [3613][3614][3615][3616][3617][3618][3619][3620] 2010

Thermal, hydrolytic, anticorrosive, and tribological properties of alkyd‐silicone hyperbranched resins with high solid content

“…Polymeric coatings have a variety of applications 1–5. However, the coatings industry is undergoing a transformation toward reduction of volatile organic compounds (VOCs).…”

Examination of the Enzyme Resistance of Polyurethane Powder Coatings

“…Powder coatings used for the study were obtained as a result of the crosslinking of the commercially available polyester resin, Rucote 102 containing hydroxyl groups by means of polyisocyanate specially synthesised for this purpose (Fig. 1) [15]. The synthesis of polyisocyanate itself involved three stages.…”

“…Their synthesis was described in the previous study [15]. Cycloaliphatic diisocyanates, monohydric alcohols and imidazole (blocking agent) were used for polyisocyanate synthesis.…”

“…Recently, I have presented a new method of polyisocyanate synthesis, which I used to obtain powder lacquers [15]. The principal purpose of this work was to examine the susceptibility of these lacqueres to the action of selected enzymes from the lipase group isolated from various microorganisms.…”

Preparation and characterization of one‐component polyurethane powder adhesives by the solution polymerization technology

“…There are two kinds of common approaches to obtain the PU powders: the mechanical pulverization technics and the emulsion freeze‐drying method. Pilch‐Pitera reported a method that mixed crosslinking agent with polyester resin and pulverize. Yin et al .…”