Resins and additives for powder coatings and alkyd paints, based on renewable resources

Abstract

Due to limited fossil resources and an increased need for environmentally friendly, sustainable technologies, the importance of using renewable feedstocks in the paint and coatings area will increase in the decades to come. This paper highlights some of the perspectives in this area. Alkyd resins for high-solid paints and reactive diluents, completely based on commercially available renewable resources, were prepared and characterized. Alkyd resins based on sucrose and unsaturated fatty acids or oils showed a low intrinsic viscosity, making them suitable to be used in high-solid alkyd paints. Reactive diluents based on similar starting materials showed excellent properties with regard to thinning behavior and effect on drying characteristics. Powder coating polyester resins were synthesized, starting from isosorbide and diacids. Polyester resins with glass transition temperatures up to 70°C were obtained. Incorporation of small amounts of other diols and trifunctional components was found to improve color and coating properties. In order to create completely renewable resin systems, the development of renewable drying agents for alkyds and crosslinkers for powder coatings is in progress.

Manganese and Iron Catalysts in Alkyd Paints and Coatings

“…It was suggested that trinuclear Fe species are formed that can lead to reactivity with the substrate only if one the iron centers is reduced to Fe II [42,43]. In addition, coating and paint drying tests were conducted using an Fe-soap/ascorbic acid mixture [44,45]. Similar or even improved drying times were observed as compared to the standard Co II (2-EH) 2 drier.…”

Isohexide Derivatives from Renewable Resources as Chiral Building Blocks

“…Only the highly activated bistriflate, [18] obtained by reacting isomannide 1 with trifluorosulfonic anhydride (Tf 2 O) and pyridine in dichloromethane, gave the desired dinitrile (3, Scheme 2). The absolute stereochemistry of the product (exo-exo conformation) was confirmed by 1D and 2D 1 H NMR, 13 C NMR, as well as single crystal X-ray diffraction ( Figure 2). …”

Amorphous polyamide coating resins from sugar-derived monomers

“…1 H NMR (delay time 5 s, 32 scans, 90°) and 13 C NMR (delay time 1 s, 2000 scans) spectroscopy measurements were performed on a Agilent 400-MR NMR system in DMSO-d 6 . Data were acquired using VnmrJ3 software.…”

“…With depleting oil reserves, efforts are made to replace these starting materials with bio-based alternatives to create more sustainable polyesters. [11][12][13][14][15][16] Storage of the powder paint imposes requirements on the glass transition temperature (T g ) value of the used polymer resin, which has to be significantly higher than ambient temperature. Storage above the T g of the powder will cause fusion of the particles, decreasing the ability of the coating to level well or even completely hampering paint application.…”