摘要:

AbstractParts‐per‐million (ppm) quantities of polysiloxanes with different molecular structures have varying effects on the foaminess of a polyolester, trimethylolpropaneheptanoate (TMPH), and a formulated synthetic polyolester gas turbine engine lubricant. At the 100 ppm concentration evaluated in a standard foam test, TMPH‐polysiloxane mixtures that exhibit lower interfacial surface tension produced copious quantities of foam. Estimates of Lewis acid‐base interaction and solubility of the additive in the polyolester are not helpful in predicting foaminess. Consideration of additive polymeric structure, the potential for increased additive molecular entanglement due to substituent length, and interaction of adjacent polysiloxane molecules at the surface, are helpful in rationalising differences observed in foaming. Some lubricant additives, such as antioxidants and antiwear agents, appear to enhance the profoamant tendencies of selected polysi

ISSN:0265-6582    

DOI:10.1002/jsl.3000140102

出版商:John Wiley&Sons, Ltd    

年代:1997

数据来源: WILEY

摘要:

AbstractRenewable sources can provide, besides fuel, a wide range of feed stocks for the organic chemicals industry. Utilisation of non‐edible vegetable oils and speciality chemicals has, therefore, become relevant in recent times. Sulphurisation of three triglyceride oils (karanja, rapeseed, and castor oils) and liquid wax (jojoba) has been investigated in detail in order to examine the potential of sulphurised vegetable oils for use as extreme‐pressure (EP) additives for developing formulations for industrial gear oils. The capacity of these oils with respect to the uptake of sulphur, the limitations of some of the sulphurised products for use as EP additives, and the problems in developing such formulations for industrial gear oils, are discus

ISSN:0265-6582    

DOI:10.1002/jsl.3000140103

出版商:John Wiley&Sons, Ltd    

年代:1997

数据来源: WILEY

摘要:

AbstractThe manufacture, use, and disposal of metalworking products are reviewed in the light of modern health and environmental considerations, and new stricter legislation, notably in Europe. Some new vegetable oil based formulations, which meet the new criteria, are presented.

ISSN:0265-6582    

DOI:10.1002/jsl.3000140104

出版商:John Wiley&Sons, Ltd    

年代:1997

数据来源: WILEY

摘要:

AbstractAs part of the continuing attempt to reduce emissions from automotive engines this paper investigates the effect of cylinder lubrication on hydrocarbon emissions, and shows that the effect of a synthetic oil on total emissions is insignificant. However, more positive results have been obtained using cylinder surface finish to control oil layers in the combustion chamber. Studies of the hydrocarbon species in the emissions showed significant differences due to surface finish profiles.

ISSN:0265-6582    

DOI:10.1002/jsl.3000140105

出版商:John Wiley&Sons, Ltd    

年代:1997

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000140106

出版商:John Wiley&Sons, Ltd    

年代:1997

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000140107

出版商:John Wiley&Sons, Ltd    

年代:1997

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000140101

出版商:John Wiley&Sons, Ltd    

年代:1997

数据来源: WILEY