Proposal - "Mechanism of Drier Action"

Abstract

This discussion departs from the usual presentation of experimental evidence, the results of original research, and subordinates experimental evidence to theory and perhaps to speculation.The subject is a very controversial one in the field of paint and varnish chemistry-how do oil-soluble metal salts accelerate the oxidation and polymerization of unsaturated triglycerides?In the last 10 years, much good work has been done on the chemical reactions involved in the drying of oils. Today, the gen-eral mechanism is fairly well accepted. The principal article in this discussion considers those chemical reactions involved in the drying of oils and proposes a mechanism to explain how oil-soluble metal compounds affect these reactions. Four experts in the field comment on and evaluate this proposal. This discussion is not expected to eliminate all controversy concerning drier action, but it is designed to spotlight areas of uncertainty and to point the way for future research.

Curing Processes in Solvent-Borne Alkyd Coatings with Different Drier Combinations

“…[2][3][4][5][19][20][21][22][23] Autoxidation is generally divided into six stages. 24 The stages that are distinguished are the induction period, the initiation, hydroperoxide formation, and decomposition, followed by cross-linking and degradation. Many possible intermediate and final species can be found during this complex autoxidation process.…”

“…The curing of alkyd coatings is a lipid autoxidation process. − ,− Autoxidation is generally divided into six stages . The stages that are distinguished are the induction period, the initiation, hydroperoxide formation, and decomposition, followed by cross-linking and degradation.…”

Synthesis and characterization of poly(vinyl ferrocene) grafted hydroxyl-terminated poly(butadiene): A propellant binder with a built-in burn-rate catalyst

“…2) of HTPB was attributed to oxygen uptake via hydroperoxidation and peroxidation reactions [21][22][23][24][25][26][27] as depicted in Scheme 1. However, this temperature decreased to 156°C in HTPB-g-PVF (Fig.…”

Effect of Driers on Linseed Oil and Varnish Films

“…A drier combination of 0.03% cobalt, 0.06% manganese, 0.5% lead, and 0.5% calcium in the form of salts of naphthenic acids was used. This choice was based on the fast-dry performance of this combination reported earlier (5).…”

“…• Varnish films dried with drier gain nearly twice as much oxygen as those dried without • Linseed oil films dried without drier gain slightly more oxygen than those dried with .A.N investigation was started in this laboratory about 6 years ago to determine the effect of various drier combinations on the air-drying and film properties of tall oil varnishes {3, 6). In subsequent work (5), infrared absorption spectra were obtained on some of these films to help explain chemically the physical changes observed.…”