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Low temperature oxidation of linseed oil: a review

机译：亚麻籽油的低温氧化：综述

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This review analyses and summarises the previous investigations on the oxidation of linseed oil and the self-heating of cotton and other materials impregnated with the oil. It discusses the composition and chemical structure of linseed oil, including its drying properties. The review describes several experimental methods used to test the propensity of the oil to induce spontaneous heating and ignition of lignocellulosic materials soaked with the oil. It covers the thermal ignition of the lignocellulosic substrates impregnated with the oil and it critically evaluates the analytical methods applied to investigate the oxidation reactions of linseed oil. Initiation of radical chains by singlet oxygen (1Δg), and their propagation underpin the mechanism of oxidation of linseed oil, leading to the self-heating and formation of volatile organic species and higher molecular weight compounds. The review also discusses the role of metal complexes of cobalt, iron and manganese in catalysing the oxidative drying of linseed oil, summarising some kinetic parameters such as the rate constants of the peroxidation reactions. With respect to fire safety, the classical theory of self-ignition does not account for radical and catalytic reactions and appears to offer limited insights into the autoignition of lignocellulosic materials soaked with linseed oil. New theoretical and numerical treatments of oxidation of such materials need to be developed. The self-ignition induced by linseed oil is predicated on the presence of both a metal catalyst and a lignocellulosic substrate, and the absence of any prior thermal treatment of the oil, which destroys both peroxy radicals and singlet O2 sensitisers. An overview of peroxyl chemistry included in the article will be useful to those working in areas of fire science, paint drying, indoor air quality, biofuels and lipid oxidation.
机译：本文对亚麻籽油的氧化以及棉花和其他浸有油的材料的自热进行了分析和总结。它讨论了亚麻籽油的组成和化学结构，包括其干燥性能。该综述描述了几种试验方法，用于测试油诱导被油浸透的木质纤维素材料自发加热和着火的倾向。它涵盖了浸有油的木质纤维素底物的热着火，并严格评估了用于研究亚麻籽油氧化反应的分析方法。单线态氧（1Δg）引发的自由基链及其传播扩展了亚麻籽油氧化的机理，导致自热并形成挥发性有机物和更高分子量的化合物。该综述还讨论了钴，铁和锰的金属络合物在催化亚麻籽油氧化干燥中的作用，总结了一些动力学参数，例如过氧化反应的速率常数。关于防火安全，经典的自燃理论不能解释自由基和催化反应，而对于浸透亚麻籽油的木质纤维素材料的自燃似乎只能提供有限的见识。需要开发这种材料氧化的新的理论和数值方法。亚麻籽油诱导的自燃是基于金属催化剂和木质纤维素底物的存在，以及对油的任何先前热处理的不存在，该热处理会破坏过氧自由基和单线态O2敏化剂。本文所包含的过氧化学概述将对从事消防科学，油漆干燥，室内空气质量，生物燃料和脂质氧化的人员有用。

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