Preparation of rapid (chain-stopped) alkyds by incorporation of gum rosin and investigation of coating properties

Abstract

In this study, the synthesis, characterization, and properties of a short oil length chain–stopped(rapid) alkyd resin is investigated. Gum rosin modified alkyd resin (RA-GR) was prepared using soybean oil, phthalic anhydride, glycerin and gum rosin acid. An alkyd modified with benzoic acid (RA-BA) was also prepared for comparison. FTIR analyses and GPC measurements of the alkyds were used for characterization. Other properties such as the viscosity, acid value, and solid content of the final resins were determined. Separately, the synthesized resins were used in paint formulations without any changes in other parameters such as filler, airdrying agents, solvents, etc. Paints were applied to metal and glass surfaces and the effect of gum rosin was investigated by looking at touch and hard drying times, adhesion to metals and gloss changes. Compared to the benzoic acid modified resin (RA-BA), gum rosin modified resin (RA-GR) exhibited remarkable positive effects on the paint with a better adhesion to the metals, and short drying times without any loses in the glosses.

NMR and GPC Analysis of Alkyd Resins: Influence of Synthesis Method, Vegetable Oil and Polyol Content

“…The resonance at about δ = 2.8 ppm, peak (G), was assigned to aliphatic CH2 groups shielded by two neighboring vinyl groups. Remaining peaks in the aliphatic region δ = 0-2.6 ppm correspond to sp 3 C bound protons assigned to the fatty acid chains, as shown in Table 2. The proton resonance assignment of all peaks is summarized in Table 2 and they align with data in the literature [29,32,33,39].…”

“…This inherent characteristic gives alkyd resins the advantage of being single component coatings and, due to their oily content, they can better tolerate the presence of rust on the surface. In addition to being easy to apply, these vegetable oil-based coatings are cheap and have been successfully used in a variety of applications, including industrial, decorative, architectural or artistic coatings [3][4][5][6]. In recent years, they are being explored for self-healing applications to ensure the long-term durability of protective coatings [7,8].…”

“…Alkyd resins can be classified in accordance with their oil length or weight percentage of oil: long (>55%), medium (45-55%) and short oil (<45%) [3,18]. Long oil alkyd resins are used in clear lacquers for decorative or artistic paints, whereas medium oil alkyd resins have a wider industrial application, being used as primers, maintenance paints and metal finishes.…”

“…On the other hand, the iodine value of oils or degree of unsaturation, determines its classification as drying, semi-drying or non-drying. Long and medium oil alkyd resins are frequently produced from semi-drying or drying oils [3,16]. Alkyd resins synthesized with non-drying oils are used as plasticizing agents [18].…”

Characterization of Boswellia rivae Engl Resin as a Potential Use for Pharmaceutical Excipient

“…Natural resins are complex substances that are produced as oxidation products of essential oils and act in response to ecological interactions. Resins are applied in different areas including in the pharmaceutical sector as excipients in the formulation of various dosage forms [ 1 , 2 ]. The functions of pharmaceutical excipients including resins are to control the release of drugs, maintain stability, alter the bioavailability, improve the therapeutic efficacy of drugs, and decrease unwanted side effects [ 3 , 4 ].…”