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<p>Castor oil is extracted from the seeds of <i>Ricinus communis</i> L., which grows in different regions of Brazil, one of the world’s largest producers. It is an important industrial crop with many industrial and pharmaceutical applications due to its great potential as a raw material to replace conventional mineral oils to formulate lubricants. Biolubricants exhibit good lubricity, high flash point, low volatility, high viscosity index, high shear stability, low compressibility, high resistance to humidity, and high dispersion capacity for different additives. Studies of the physicochemical properties and oxidative stability of cutting fluids using castor oil in water (O/W) emulsion are few covered in the literature. This study investigated the physicochemical behavior of biodegradable cutting fluid from refined castor oil. In the experiments, a factorial design 2<sup>4</sup> was used, varying the emulsifier (A), anticorrosive (B), biocide (C), and antifoam (D) additives. We evaluated the total acidity index, oxidative stability, viscosity, water content, density, foaming test, microbiological resistance, electric conductivity, color, and corrosivity level. Furthermore, a stability study of the formation of O/W emulsions was carried out at percentages of 5%, 10%, and 15%, in which the most satisfactory tests were subjected to machining tests by turning on SAE 1020 steel parts. The best-emulsified formulation (E_CF9-10%) exhibited an oxidative stability of 19.13&#xa0;h, a viscosity at 40&#xa0;°C of 1.3550 cSt, a total acidity index of 0.475&#xa0;mg KOH/g, a microbiological resistance of 2&#xa0;days, and a corrosivity level of 1A. The results indicate the new formulation shows potential compared with other commercially available origin mineral-cutting fluids.</p>

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Study of the stability and physicochemical behavior of a novel biolubricant based on castor oil used in cutting operations

  • 期刊论文

  • 发表日期：

    2025年2月6日

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  • Quíssila Goes Antunes,
  • Ana Lara Araújo Santos,
  • José Italo Porto Siqueira,
  • Ronaldo Guilherme Santos Lima,
  • Gabriel Francisco da Silva,
  • João Paulo Lobo dos Santos

摘要

Castor oil is extracted from the seeds of Ricinus communis L., which grows in different regions of Brazil, one of the world’s largest producers. It is an important industrial crop with many industrial and pharmaceutical applications due to its great potential as a raw material to replace conventional mineral oils to formulate lubricants. Biolubricants exhibit good lubricity, high flash point, low volatility, high viscosity index, high shear stability, low compressibility, high resistance to humidity, and high dispersion capacity for different additives. Studies of the physicochemical properties and oxidative stability of cutting fluids using castor oil in water (O/W) emulsion are few covered in the literature. This study investigated the physicochemical behavior of biodegradable cutting fluid from refined castor oil. In the experiments, a factorial design 24 was used, varying the emulsifier (A), anticorrosive (B), biocide (C), and antifoam (D) additives. We evaluated the total acidity index, oxidative stability, viscosity, water content, density, foaming test, microbiological resistance, electric conductivity, color, and corrosivity level. Furthermore, a stability study of the formation of O/W emulsions was carried out at percentages of 5%, 10%, and 15%, in which the most satisfactory tests were subjected to machining tests by turning on SAE 1020 steel parts. The best-emulsified formulation (E_CF9-10%) exhibited an oxidative stability of 19.13 h, a viscosity at 40 °C of 1.3550 cSt, a total acidity index of 0.475 mg KOH/g, a microbiological resistance of 2 days, and a corrosivity level of 1A. The results indicate the new formulation shows potential compared with other commercially available origin mineral-cutting fluids.