Prevention of oxidative degradation of ZnDTP by microcapsulation and verification of its antiwear performance

Masuko, Masabumi; Sato, Hiroyasu; Suzuki, Akihito; Kurosawa, Osamu

doi:10.1016/j.triboint.2008.01.005

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…Therefore, it is imperative to develop a new sealing material to achieve high-quality sealing. Microencapsulation is a technique of gas, liquid and solid encapsulation using a continuous thin film made of natural or synthetic high-molecular compound, which is applied to maintain the chemical property of the target object (Piva et al, 1997;Masuko et al, 2008). In general, the outer membrane of the capsule directly aggregates on the target object, forming an irregular microcapsule.…”

Section: Sealing-isolation Combination Techniquementioning

confidence: 99%

Novel integrated techniques of drilling–slotting–separation-sealing for enhanced coal bed methane recovery in underground coal mines

Zou

Lin

Zheng

et al. 2015

Journal of Natural Gas Science and Engineering

163

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Coal bed Methane (CBM), a primary component of natural gas, is a relatively clean source of energy.Nevertheless, the impact of considerable coal mine methane emission on climate change in China has gained an increasing attention as coal production has powered the country's economic development. It is well-known that coal bed methane is a typical greenhouse gas, the greenhouse effect index of which is 30 times larger than that of carbon dioxide. Besides, gas disasters such as gas explosive and outburst, etc. pose a great threat to the safety of miners. Therefore, measures must be taken to capture coal mine methane before mining. This helps to enhance safety during mining and extract an environmentally friendly gas as well. However, as a majority of coal seams in China have low-permeability, it is difficult to achieve efficient methane drainage. Enhancing coal permeability is a good choice for high-efficiency drainage of coal mine methane. In this paper, a modified coal-methane co-exploitation model was established and a combination of drilling-slotting-separation-sealing was proposed to enhance coal permeability and CBM recovery. Firstly, rapid drilling assisted by water-jet and significant permeability enhancement via pressure relief were investigated, guiding the fracture network formation around borehole for high efficient gas flow. Secondly, based on the principle of swirl separation, the coal-water-gas separation instrument was developed to eliminate the risk of gas accumulation during slotting and reduce the gas emission from the ventilation air. Thirdly, to improve the performance of sealing material, we developed a novel cement-based composite sealing material based on the microcapsule technique. Additionally, a novel sealing-isolation combination technique was also proposed. Results of field test indicate that gas concentration in slotted boreholes is 1.05-1.91 times higher than that in conventional boreholes. Thus, the proposed novel integrated techniques achieve the goal of high-efficiency coal bed methane recovery.

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Section: Sealing-isolation Combination Techniquementioning

confidence: 99%

Novel integrated techniques of drilling–slotting–separation-sealing for enhanced coal bed methane recovery in underground coal mines

Zou

Lin

Zheng

et al. 2015

Journal of Natural Gas Science and Engineering

163

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“…The compounds from the tribochemical reaction of ZnDTP act as a protective film against friction and prevent direct contact with metal surfaces. 2 Molybdenum dithiocarbamate (MoDTC) is a well-known lubricant additive to form MoS 2 with low shear strength and reduce boundary friction. [3][4][5] On the other hand, chemical reaction products such as phosphides and sulfides from ZnDTP can affect the performance of exhaust catalysts and diesel particulate filters in motor engines, so it is necessary to reduce the phosphorus and sulfur concentration in lubricating oils.…”

Section: Introductionmentioning

confidence: 99%

“…A typical example of an extreme pressure additive is zinc dialkyl dithiophosphate (ZnDTP). The compounds from the tribochemical reaction of ZnDTP act as a protective film against friction and prevent direct contact with metal surfaces 2 . Molybdenum dithiocarbamate (MoDTC) is a well‐known lubricant additive to form MoS 2 with low shear strength and reduce boundary friction 3–5 .…”

Section: Introductionmentioning

confidence: 99%

Wear resistance by copolymers with controlled structure under boundary lubrication conditions

Omiya

Bon

Vuchkov

et al. 2023

Lubrication Science

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Lubricants are of paramount importance in protecting metallic contact surfaces and reducing friction. The viscosity of lubricating oil can be engineered by introducing long linear polymers, such as poly(lauryl methacrylate) (PLMA). In particular, the formation of adsorption films by using polymers with hydroxy or amino side groups has attracted much attention in recent years. In this study, copolymers with controlled structure were synthesised by SARA ATRP, which can be used in large scale production. A comparison of friction and wear under boundary lubrication was conducted using both statistical and block copolymers with low Ð. Friction test results using a reciprocating sliding machine (SRV) showed that the block copolymers were less likely to desorb from the metal surface than the statistical copolymers. In addition, the wear evaluation after the SRV test showed that the block copolymer had less wear and less wear debris.

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“…Masukoet et al added the zinc dialkyldithiophosphate (ZnDTP) filled microcapsules in engine oil to prevent the oxidative degradation of ZnDTP. The oil life was successfully extended and the antiwear performance of engine oil was enhanced (Masuko et al, 2008). Khun et al incorporated hexamethylene diisocyanate (HDI) filled microcapsules and wax filled microcapsules into epoxy matrix as binary and ternary epoxy composites.…”

Section: Introductionmentioning

confidence: 99%

Tribological behaviors of water-based drilling mud with oleic acid-filled microcapsules as lubricant additives for steel-steel contact

Liu

Xiao

2020

ILT

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Purpose The purpose of this paper is to study the tribology behavior of steel–steel contact under the lubrication of water-based drilling mud with different oleic acid-filled microcapsules as lubricant additives. Design/methodology/approach A ball-on-disc tribometer was used to evaluate the lubrication properties of the steel–steel contact. The wear tracks of the worn surfaces were observed by a scanning electron microscope. Findings Results show that the dependence of both friction and wear on the category of additives shares a consistent pattern. In contrast to oleic acid and empty microcapsules, oleic acid-filled microcapsules achieve the best tribological performance which is related to the lubricant effect of oleic acid and the isolation and rolling abilities of microcapsules. Practical implications This study provides a helpful method of encapsulated lubricant additives to prolong lubrication performance for steel–steel contact. Originality/value This study has applied microcapsules to improve the tribological properties of drilling mud. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2019-0320/

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Prevention of oxidative degradation of ZnDTP by microcapsulation and verification of its antiwear performance

Cited by 13 publications

References 8 publications

Novel integrated techniques of drilling–slotting–separation-sealing for enhanced coal bed methane recovery in underground coal mines

Novel integrated techniques of drilling–slotting–separation-sealing for enhanced coal bed methane recovery in underground coal mines

Wear resistance by copolymers with controlled structure under boundary lubrication conditions

Tribological behaviors of water-based drilling mud with oleic acid-filled microcapsules as lubricant additives for steel-steel contact

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