Preparation of Oil-Encapsulated Microcapsules and Tribological Property of Ni Composite Coating

Aruna, S.T.; Arunima, S.R.; Latha, Srinivasan; Grips, V.K. William

doi:10.1080/10426914.2014.973585

Cited by 16 publications

(8 citation statements)

References 17 publications

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“…In recent years, significant anti-friction and wear-resisting effects have been achieved by encapsulating liquid lubricants into microcapsules for the modification of polymers. [1][2][3] After continuous improvement and optimization, microencapsulation technologies have been greatly developed, leading to a trend of diverse preparation methods and multiple series of preparation materials. The synthesis methods include solvent evaporation, [4] interfacial polymerization, [5] in situ polymerization, [6] sol-gel, [7] surface modification, [8] multiple assembly, [9] and so forth.…”

Section: Introductionmentioning

confidence: 99%

Effects of nickel shell microcapsules and short fibers on polyamide 6‐matrix composites: Thermal, surface wetting, mechanical, and tribological properties

Zhang

Yan

et al. 2022

Polymer Composites

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The excellent lubricating properties of microcapsules have been well recognized in modified polymers though very few reports have mentioned the practical application for engineering parts. In this study, different short fibers and nickel shell microcapsules (NMS) synergistically modify PA6 and injection molded to prepare bearings. With 10 wt% NMS, the COF could be reduced from 0.45 to 0.1. Fibers can effectively overcome bearing failure resulting from crushing the matrix under high loads or rapid peeling wear at high swing frequencies, which can warrant the effective lubrication of NMS and the formation of high‐quality transfer film. The bearing long‐life test shows very stable and low COF and wear with the feasibility to utilize microcapsules modified polymers in journal bearings.

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Section: Introductionmentioning

confidence: 99%

Effects of nickel shell microcapsules and short fibers on polyamide 6‐matrix composites: Thermal, surface wetting, mechanical, and tribological properties

Zhang

Yan

et al. 2022

Polymer Composites

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“…Bao et al [13] improved the corrosion and water resistance of waterborne polyacrylate coating through introducing benzotriazole @ zinc oxide microcapsules. Aruna et al [14] used in situ interfacial polymerization method to prepare the lubricating oil-encapsulated urea-formaldehyde microcapsules, and found that electrodeposited Ni coating containing oil-encapsulated microcapsules exhibited improved tribological properties compared to plain nickel coating. Li et al [15] prepared tung oil-loaded microcapsules with the protection of poly(urea-formaldehyde) shells by in situ polymerization method.…”

Section: Introductionmentioning

confidence: 99%

Effect of Urea-Formaldehyde (UF) with Waterborne Emulsion Microcapsules on Properties of Waterborne Acrylic Coatings Based on Coating Process for American Lime

2020

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The purpose of this paper is to explore the effect of urea-formaldehyde (UF) with waterborne emulsion microcapsules on the optical, mechanical and aging resistance properties of waterborne coatings from the perspective of coating process. In this paper, the microcapsules were prepared with UF resin as the wall materials and waterborne emulsion as the core materials. Based on the coating process, the optical, mechanical and aging resistance properties of the waterborne acrylic coatings with microcapsules for American lime were tested. The good coating process is three layers of primer, two layers of topcoat, and adding microcapsules into primer. The results showed that the coating process had little effect on the color difference of the paint film with microcapsules, the gloss of the paint film prepared by the good coating process was basically not changed, and the mechanical properties of the paint film were good. At this time, the hardness grade of the paint film was 3H, the adhesion was grade 0, the impact resistance was 110.0 N·cm−2, and the elongation at break was 29.7%. The microcapsules added to the primer had better liquid resistance than those added to the topcoat. The paint film had good stability and aging resistance, and could inhibit the generation of microcracks to a certain extent. The paint film prepared by the good coating process had better comprehensive performance. This work provides a technical reference for self-healing of the waterborne coatings on American lime.

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“…Capsule‐based self‐lubricating composites have attracted increasing attention and have been extensively investigated in recent years . As reported in previous research, to provide the self‐lubricating function, the lubricant must be wrapped in microcapsules before being incorporated into self‐lubricating polymer bulk materials or coating.…”

Section: Introductionmentioning

confidence: 99%

“…Various lubricants have been microencapsulated, including lubricant oil, paraffin, wax, diisocyanate, and ionic liquid . In addition to reducing friction and wear, lubricating oils are required to cool the rubbing surfaces that are heated due to friction.…”

Section: Introductionmentioning

confidence: 99%

Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF₆‐Loaded Multilayer Wall Microcapsule

Cui

et al. 2019

Macro Materials & Eng

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polymer bulk materials or coating. Upon damaging the self-lubricating materials by friction, the embedded microcapsules simultaneously rupture, release the lubricant, form the transfer film, and then lubricate the wear surface. Therefore, selflubricating microcapsules must possess several features, such as excellent thermal stability, high encapsulation efficiency, and good lubricating properties.Various lubricants have been microencapsulated, including lubricant oil, [4][5][6][7] paraffin, wax, [8][9][10][11] diisocyanate, [12,13] and ionic liquid. [14][15][16] In addition to reducing friction and wear, lubricating oils are required to cool the rubbing surfaces that are heated due to friction. Thermooxidative stability of lubricants is essential to minimize degradation during service and storage. Lubricating oils may vaporize and sometimes may catch fire due to friction heat. Therefore, less volatile and nonflammable liquids are desirable for lubricants. [17] Compared with some common lubricants, ionic liquids have high thermal stabilities (the thermal degradation temperature is usually higher than 350 °C) and low volatility and non-flammability. These excellent properties make them more suitable as high-performance lubricants. [18][19][20][21] Nevertheless, when the wrapped core material is an ionic liquid, the encapsulation efficiency is lower because the high viscosity and bipolar nature of the ionic liquid make them difficult to disperse in a continuous phase during microencapsulation. [22][23][24][25] Recently, we have prepared ionic liquid [BMIm] PF 6 -loaded polyurea (PU) microcapsules with >70 wt% encapsulation efficiency by optimizing a Pickering emulsion and interface polymerization method. The Pickering emulsion was stabilized by lignin solid particles instead of molecular surfactants and some inorganic particles, and we found that the lignin exhibited excellent emulsifying properties for ionic liquid. [26] However, the smooth outer surface of PU microcapsules prevents them from forming a good interface with the resin matrix when they are used to prepared composites. In order to improve the thermal stability, mechanical properties, long-term stability at room temperature of microcapsules, and then to make these microcapsules were satisfy the requirements of the processing of polymeric composites under high temperatures and large shear stress conditions, Self-Lubricating CompositesMultilayer wall microcapsules efficiently loaded with a lubricant (ionic liquid [BMIm]PF 6 ) are successfully synthesized via a combination of interfacial and in situ polymerization reactions based on lignin nanoparticle-stabilized Pickering emulsion templates. The resulting microcapsules are spherical in shape, with an ideal structure of a rough outer surface and a smooth inner surface. The mean diameter and wall thickness of the resultant microcapsules are 52 ± 18 µm and 3-6 µm. The core fraction is ≈71.29 wt%. Compared with the pure epoxy resin, the friction coefficient of self-lubricating composites decreases by 83.6% (fr...

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Preparation of Oil-Encapsulated Microcapsules and Tribological Property of Ni Composite Coating

Cited by 16 publications

References 17 publications

Effects of nickel shell microcapsules and short fibers on polyamide 6‐matrix composites: Thermal, surface wetting, mechanical, and tribological properties

Effects of nickel shell microcapsules and short fibers on polyamide 6‐matrix composites: Thermal, surface wetting, mechanical, and tribological properties

Effect of Urea-Formaldehyde (UF) with Waterborne Emulsion Microcapsules on Properties of Waterborne Acrylic Coatings Based on Coating Process for American Lime

Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF₆‐Loaded Multilayer Wall Microcapsule

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Preparation of Oil-Encapsulated Microcapsules and Tribological Property of Ni Composite Coating

Cited by 16 publications

References 17 publications

Effects of nickel shell microcapsules and short fibers on polyamide 6‐matrix composites: Thermal, surface wetting, mechanical, and tribological properties

Effects of nickel shell microcapsules and short fibers on polyamide 6‐matrix composites: Thermal, surface wetting, mechanical, and tribological properties

Effect of Urea-Formaldehyde (UF) with Waterborne Emulsion Microcapsules on Properties of Waterborne Acrylic Coatings Based on Coating Process for American Lime

Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF6‐Loaded Multilayer Wall Microcapsule

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Ultralow Tribological Properties of Polymer Composites Containing [BMIm]PF₆‐Loaded Multilayer Wall Microcapsule