摘要:

AbstractIn this paper, the results of fractionation of polyalkyl benzene residues from monoalkyl benzene production, using a molecular evaporator to obtain fractions which are usable as lubrication oils for refrigeration compressors with a non‐polar refrigerant, are presented. Two of the distillion fractions pre‐pared correspond to international viscosity classes I S 0 VG 22 and 46. Their yields of 45 and 15% respectively from the original residues are economically interesting and they are of a higher quality than the previously used mineral oil based lubricants. The polyalkyl benzenes have improved properties, such as viscosity index, flash point temperature, and pour point. The lower thermo‐oxidative stability of the fractions is compensated for formulations with appropriate antioxi

ISSN:0265-6582    

DOI:10.1002/jsl.3000100402

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractThrough co‐oligomerisation of alphaolefins with alkylmethacrylates, fluids are obtained with a unique chemical combination of non‐polar PAO and polar ester oil in one molecule. The polarity of these co‐oligomers between P A 0 on the one hand and ester oil on the other helps to avoid the typical disadvantages of these common synthetic base oils. Thus, co‐oligomers offer superior solvency for DI packages, neutral elastomer behaviour, the hydrolytic stability of sterically hindered esters, a thermal and oxidative stability close to PAO, and free miscibility with mineral oil and synthetic base stocks. Co‐oligomers are Newtonian fluids of high purity and with a viscosity range between 50 and 600 mm2/s at 100°C. Both viscosity level and purity open up a range of applications. Even without high molecular weight VI improver, gear oils, and hydraulic oils with outstanding viscometric performance can be formulated. The purity has a positive influence on properties such as demulsibility, de‐aeration, and foaming behaviour. The present paper compares co‐oligomers with common base fluids and gives examples of typica

ISSN:0265-6582    

DOI:10.1002/jsl.3000100403

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractThe friction and wear of steel pins coated with filled polyamides and loaded against a rotating cylinder of bearing steel were tested under dry, lubricated, and abrasive contaminated conditions. The filler materials were copper/lead and aluminium/tin powders.The test results show a significant reduction in friction with the Cu/Pb filled polyamides (8 wt.% Cu, 12 wt.% Pb, and 80 wt.% PA6). The Al/Sn filled polyamides (3 wt.% Al, 2 wt.% Sn, and 95 wt.% PA6) showed the best wear resistance, accompanied by an increase in the coefficient of friction.

ISSN:0265-6582    

DOI:10.1002/jsl.3000100404

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

摘要:

AbstractIn this paper, the authors have systematically studied the friction characteristics of various Langmuir‐Blodett (LB) films of cadmium salts of long alkyl chain fatty acids. The parameters chosen were the number of layers of LB film, the load, and the sliding velocity. The results showed that there exists a range of numbers of layers for which a kinetic friction coefficient value (uk)as low as 0.02 is obtained. On the other hand, the friction coefficient in‐creased gradually as the sliding velocity increa

ISSN:0265-6582    

DOI:10.1002/jsl.3000100405

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000100406

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000100407

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000100408

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY

ISSN:0265-6582    

DOI:10.1002/jsl.3000100401

出版商:John Wiley&Sons, Ltd    

年代:1994

数据来源: WILEY