KR890000962B1 - Lubricant composition - Google Patents

Abstract

A compsn. for lubricating a locked-coil rope comprises (a) a mineral lubricating base oil, (b) 15-50 wt.% of a polyolefin oil with an average mol. wt. of 2000-20000, and (c) 5-30 wt.% of a microcrystalline wax. The component (a) is pref. paraffinic lubricating oil with a viscosity of 50-500 cst at 40≰C. The compsn. can also contain lanolin, neutral Ba naphthalenesulphonate and antioxidant. The compsn. is esp. useful for lubricating locked-coil steel wire cables, and has good adhesion properties.

Description

Lubricant composition

The present invention relates to a lubricant composition suitable for lubricant of a locked coil rope.

There are two main types of ropes: strand ropes and lock coil ropes.

Strand ropes are wound around a number of strands, and the strands consist of many lines. The ropes, usually steel ropes or cables, are lubricated and are generally protected from corrosion by incorporating lubricant during manufacturing. When the cable is used some of the lubricant is pushed out of the cable and lost. To compensate for this loss, cables should be regularly lubricated. For this purpose, lubricants are sometimes mixed with volatile solvents.

The lock coil rope, which is usually fixed to the friction winder, consists of individual wires (usually steel wires) with some form of cross section on the outer foot layer so that each wire can be fixed together. The advantage is that the cross-sectional area is small, so that the void space is larger, the failure load is higher, the outer surface is smooth, and there is no spinning property. It is important to retain the lubricant in the ropes because it is extremely difficult to resupply the lubricant effectively. For this reason, the lubricants used during manufacture must meet the requirements for viscosity, shear stability, oxidation stability and corrosion resistance.

As such, debris that swells the cable can accumulate due to the tightness of the cable with any wear between the strands of the lock coiled steel cable. This can lead to corrosion and exudate lubricant, which in turn results in too low a friction coefficient between the rope and the friction winder.

The present invention provides a lubricant composition suitable for use with a lock coil rope lubricant.

The present invention therefore relates to a lubricant composition suitable for the lubrication of rock coil ropes consisting of: a) inorganic lubricating oil having a viscosity of 50-500 cst at 40 ° C. as base oil, b) polyolefin oil with an average molecular weight of 2,000-20,000. 15-50% by weight, and c) 5-30% by weight of fine crystalline wax, inorganic lubricants as base oils, polyolefin oils and paraffin waxes, are already known from British Patent No. 1,143,260. However, the patent does not relate to lubricants for lock coil ropes. Moreover, the content of polyolefin oil is only 1-15% by weight. In addition, the wax in the present composition is a microcrystalline wax and the patent does not mention such a wax. This microcrystalline wax-containing composition has good adhesion to metal surfaces as compared to paraffin wax-containing compositions.

Component (a) is a paraffin lubricating oil having a viscosity of 90-150 cst at 40 ° C., suitably a mixture of paraffin midstream and residual lubricating oil.

Component (b) is polybutene, in particular polyisobutene. The average molecular weight is 5,000-10,000. A good content is 20-25% by weight.

The melting point of component (c) is 60-80 ° C. A good content is 10-15% by weight.

Small amounts of other components may also be present, such as anticorrosive compounds (eg lanolin, neutral naphthalene sulfonates) and antioxidants (eg phenolic compounds). Suitable content is 0.1-10% by weight.

The composition has a drop point of at least 46 ° C. (IP31), an unworked penetration of 200-250 dmm (IP179.5 seconds, 150 g, 25 ° C.) and an operating penetration of 400 dmm (IP50). The composition is used after melting by heating to 70-100 ° C. during cable manufacture.

The composition may be prepared by adding base oil to a mixed vessel, heating to 75-85 ° C., adding an antioxidant, and then adding all other ingredients to the desired level. The mixture is kept at 75-85 ° C. until homogeneous, then placed in a suitable container and kept above 70 ° C.

The lubricant composition thus prepared has the following composition (% by weight):

Example 1

HVI paraffin lubricant 58.5 with 100 cst viscosity at 40 ° C

Polyisobutene, 5,800 Mole Weight 23

Microcrystalline Wax, Melting Point 66 ° C 12

Lanolin 3

Neutral Barium Naphthalene Sulfonate Ionol (Iono1: Trademark) 3

(2,3-di-tert-butyl 4-methyl phenol) 0.5

Falling point (IP 132) 47 ℃

Non-operating penetration 205 dmm at 25 ° C (IP 179)

Operational penetration 454 dmm at 25 ° C (IP 50)

Example A

Not according to the invention

Commercially available L.C.1 lubricants for lock steel cables are oil / bitumen mixtures containing microcrystalline waxes and lanolin.

[Experiment]

FAFNIR test equipment

This is an accelerated wear and tear experiment and is described in National Lubricating Grease Institute (NLGI) Spoxman, April 1979, p. 18.

One-standard bearings and a load ring were used, protruding at a load of 270 kg by a coil spring and oscillating at 6 ° (i.e. 3 ° on either side of the center line) at 1500 frequencies per minute (o.p.m) for 1000 hours.

[result]

1.1 Example A

The bearing surface was fatigued and the product was severely oxidized on the fire and cage surface.

The wear scars measured were 20 × 10 ⁻³ mm.

1.2 Example 1

The bearing surface showed no fatigue and the running track was shiny. There was no oxidation of the product. Abrasion failure could not be measured.

In turn, the vibration angle was increased from 6 ° to 12 ° (i.e. 6 ° on either side from the centerline) to increase the severity of the two experiments. All other conditions were the same.

2.1 Example A

The continuous experiment was terminated after 240 hours when the composition lacked safety. The bearing was badly worn and the product was oxidized to black deposits and adhered to the working surface. The wear scar measured was 650 × 10 ^-3 mm.

2.2 Example 1 after 240 hours

The bearings were slightly damaged and the product remained clear and clean on the working surface. The measured wear scar was 37.5 × 10 ⁻³ mm.

Claims (5)

Lubricating a lock coil rope comprising (a) an inorganic lubricant as base oil, (b) 15-50% by weight of polyolefin oil having an average molecular weight of 2,000-20,000, and (c) 5-30% by weight of fine crystalline wax. Lubricant compositions suitable for the following. The lubricant composition of claim 1 wherein component (a) is a paraffin lubricant having a viscosity of 40-500 cst at 40 ° C. 3. The lubricant composition according to claim 1 or 2, wherein component (b) is polybutene having an average molecular weight of 5,000-10,000. The lubricant composition of claim 1 wherein component (c) is a microcrystalline wax having a melting point of 60-80 ° C. 3. The lubricant composition of claim 1 wherein the composition further comprises lanolin, neutral barium naphthalene sulfonate and an antioxidant.