The main purpose of this study was to investigate the effects of different types and concentrations of mineral extenders on some major properties of long oil alkyd paint with the main pigment of titanium dioxide (TiO2). To this end, a fraction of TiO2 was replaced with extenders including kaolinite, talc, dolomite, and barite. Moreover, adhesion, bending test, and coating quality were measured once the given extenders were added to the formulation. The results revealed that adding these extenders to the formula had led to no significant changes in adhesion, bending test, as well as coating quality. In addition, drying time, reflection, total solvent used, milling time, and hiding power were considered as some parameters monitored during the use of different types of extenders. The findings also confirmed that replacing 5 and 7 wt. % of TiO2 with different extenders could have an adverse effect on reflection and hiding power. However, milling time and total solvent used had increased. Moreover, samples such as kaolinite + calcium carbonate (CaCO3) (H-1), kaolinite + talc (H-2) and kaolinite + nano clay (NC) (H-3) were prepared to investigate the effect of hybrid extender content on major properties of the paint. The results revealed that milling time and solvent weight had augmented and the paint including kaolinite + NC (H-3) showed the highest level of milling time (420 min) and solvent weight (63. 9 g) among others. However, drying time and reflection did not show any significant difference. In addition, the findings confirmed the positive effect of the hybrid extender system on abrasion properties of the long oil alkyd paint. Prog. Color Colorants Coat. 13 (2020), 167-175© Institute for Color Science and Technology.

The lifespan of organic coatings is reduced in outdoor applications by attacks of solar radiation, oxygen and atmospheric pollutants. Degradation of coating and recoating introduce pollutants into the environment. For solvent base coatings like alkyd paints volatile organic compounds (VOC) are main source of pollution. Undesirable mechanical, physical and chemical consequences of the resulting degradation can be substantially restricted by properly selected photo stabilizers. Tautomerizations in this compound make them to be consider as UV absorber important and effective class of UV-absorbers. In this study some new derivatives of absorbers were synthesized. Structures of compounds were elucidated by spectroscopic data and these compounds were added to red alkyd paint as UV absorber. After a week exposure to 80 watt UV-lamp, gloss of high gloss alkyd paint (92%) reduced to 3%, although that was 7.1% for polyester paint. In the presence of TINUVIN 315 3206 and synthesized compounds, stability of paints against UV radiation improved significantly. Results indicated that fastness of high gloss red alkyd paint was improved sufficiently. This makes coating more stable and reduces the environmental contamination. Consequently, less recoating will lead to decreasing VOC, costs and other environmental pollutants.

This study explores the potential of lignin as a feedstock for the green manufacture of alkyd resins, utilizing an underutilized component of cellulosic biomass. The use of eucalyptus sawdust for this purpose provides the novel backbone for this research. The conventional production of polyester resins relies on petroleum-based pentaerythritol, which has far-reaching environmental effects. Addressing this issue, organosolv lignin extracted from eucalyptus sawdust using acidified methanol was utilized to synthesize flexible alkyd resins. The resulting product, a monoglyceride, was reacted with maleic anhydride to give an alkyd resin. The resin was further incorporated into a paint and varnish formulation. The study employed quantitative analysis of the resin, paint, film, and varnish through UV-Vis and FTIR spectroscopy, evaluating their optical properties and transmittance. The outcome was an alkyd resin with optimal flexibility and excellent optical properties, enabling its use on diverse substrates. This research contributes to a more sustainable manufacturing approach, reducing dependence on petroleum-based materials in paint and varnish formulations.

Alkyd resins are amongst the most important and widely used resins in coating sectors. In this communication we report on preparation of alkyd resins emulsified by grafted acrylic resins on their fatty acid moieties. Both high-shear mechanical homogenizer and ultra-sonic sonicator were used step-wise to disperse the alkyd resin and acrylic based monomers in aqueous media. The resins are of nanometric particle size (~200nm) dispersed in water in the presence of polymerization emulsifying agent. The FT-IR spectroscopy revealed the differences in the spectrum of the base resins and hybrid resin. The extraction test revealed formation of better than 99% of grafted hybrid resin. The DSC test showed that the glass-transition temperatures of the hybrid resin are very lower than that of the base alkyd and acrylic polymers which re-confirm formation of chemically grafted hybrid resin. The molecular weight of the hybrid resin was also found to be a combination of those of the base resins. The polydispersity of the base resins is about 8, whereas that of the hybrid resin locates around 32 which is resulted from differences in the molecular weight of the base resins. The films of the resulting resins were fully dried after 8 hours at room temperature without any further loss in weight or tackiness.