JPH0210200B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a locked coil rope.
The present invention relates to a lubricant composition suitable as a lubricant for a coil rope.

There are two main types of rope designs: strand rope and locked coil rope.

A strand rope consists of a number of strands wound into a rope, and these strands are made up of a number of wires. During manufacture, this type of rope, usually a steel rope or cable, is generally lubricated by impregnating it with a lubricant and
Provides corrosion protection. As the cable is used, a portion of the lubricant detaches from the cable and is lost. To compensate for this loss, the cable must be treated with lubricant at regular intervals. For this purpose, lubricants are often mixed with volatile solvents.

Locked coil ropes, which are normally attached to friction winders, are constructed of individual wires, generally steel wires, the outer wire cross-sections of which are shaped to match each other. Its advantage is that it has a smaller cross-section without voids, has a smooth outer surface and exhibits non-swirling properties, so it has higher cutting loads. Retention of lubricant is important for these ropes as effective relubrication is extremely difficult. For that reason, the lubricants applied during production must meet high demands regarding viscosity, shear stability, oxidative stability and corrosion resistance.

For example, fretting between the strands of locked coil steel cables causes debris to accumulate which causes expansion of the cable due to its dense structure. This can lead to corrosion and also to leaching of lubricant, so that the coefficient of friction between the rope and the friction winder is very low.

The present invention provides a lubricant composition that is highly suitable for use as a locked coil rope lubricant.

The present invention therefore relates to a lubricant composition suitable for the lubrication of locked coil ropes, which lubricant composition has (a) a lubricity as a base oil, preferably having a viscosity of 50 to 500 cSt at 40°C; (b) 15-50% by weight of a polyolefin oil having an average molecular weight of 2,000-20,000; and (c) 5-30% by weight of a microcrystalline wax.

A lubricant for steel cables consisting of a lubricating mineral oil as base oil, a polyolefin oil and a paraffin wax is already known from GB 1 143 260. However, this specification does not relate to lubricants for locked coil ropes. Furthermore, the proportion of polyolefin oil is only 1-15% by weight. Furthermore, although the wax in the composition of the present invention must be a microcrystalline wax, the above-mentioned patent does not teach this type of wax. The microcrystalline wax-containing compositions of the present invention exhibit superior adhesion to metal surfaces compared to paraffin wax-containing compositions.

Component (a) is preferably a paraffinic lubricating oil having a viscosity of 90 to 150 cSt at 40°C. Preferably this is a blend of paraffinic distillate and lubricating residual oil.

Component (b) is preferably polybutene, especially polyisobutene. Average molecular weight is preferably 5000~
It is 10000. Preferably the proportion is 20-25% by weight
It is.

Component (c) preferably has a melting point of 60-80°C.
A preferred proportion is 10-15% by weight.

Small proportions of other ingredients, such as corrosion-resistant compounds (e.g. lanolin), natural naphthalene sulfonates and antioxidants (e.g. phenolic compounds)
can also exist. The suitable ratio is 0.1~
It is 10% by weight.

The composition of the invention preferably has a temperature of at least 46°C.
(IP 31) dropping point and 200-250dmm (IP 179.5s,
150g, 25℃) and a minimum
It has a miscibility of 400dmm (IP 50). These are applied during the manufacture of the cable after being melted, for example by heating to a temperature of 70-100°C.

The compositions of the present invention can be prepared by filling a compounding container with base oil, heating the base oil to 75-85°C, adding the antioxidant, and adding all other ingredients in the desired order. can. The blend is maintained at 75-85°C until homogeneous and then decanted into a suitable container while the temperature is still above 70°C.

The lubricant composition thus produced had the following composition (% by weight):

Example 1 HVI paraffinic lubricating oil with a viscosity of 100 cSt at 40°C 58.5 Polyisobutene with a molecular weight of 5800 23 Microcrystalline wax with a melting point of 66°C 12 Lanolin 3 Neutral barium naphthalene sulfonate 3 Ionol® (2,6- Di-tert-butyl-4-methylphenol) 0.5 Dropping point (IP 132) 47℃ Immiscible consistency, 25℃ (IP179) 205dmm Miscible consistency, 25℃ (IP 50) 454dmm Comparative example A (invention Commercially available locked steel cable lubricant LC1 is an oil/bitumen mixture containing microcrystalline wax and lanolin.

Test FAFNIR test rig This is an accelerated micro-wear test.
fretting test), described in NLGI (National Renewable Grease Institute) Spokesman, April 1979, p. 18.

Sequence 1 Using standard bearings and load rings, test at 6° vibration angle at frequencies per minute (opm).
Lasted for 1000 hours at 1500 times. That is, a load thrust of 270 kg was applied to both sides of the center line at an angle of 3° via coil springs.

Results 1.1 Comparative Example A The bearing surface showed signs of damage and the product was heavily oxidized throughout the ball and cage surfaces. The measured wear scar was 20×10 ^-3 mm.

1.2 Example 1 The bearing surface showed no signs of damage and there was evidence of abrasive effects on the running track. There were no signs of product oxidation. Furthermore, it was not possible to measure wear scratches.

Sequence 2 To increase the severity of the test, the vibration angle was doubled from 6° to 12°, ie 6° on either side of the centerline. All other conditions were the same.

2.1 Comparative Example A This composition completely failed the test after 240 hours of continuous operation. The bearings were severely damaged and the product was oxidized to black deposits that adhered to the working surfaces. The measured wear scar was 650×10 ^-3 mm.

2.2 Example 1 (after 240 hours) The bearing was slightly scratched, but the product remained clean and shiny over the entire working surface.
The measured wear scar was 37.5×10 ^-3 mm.

Claims (1)

[Scope of Claims] 1 (a) Lubricating mineral oil as a base oil; (b) 15 to 50% by weight of polyolefin oil having an average molecular weight of 2,000 to 20,000; (c) 5 to 30% by weight of microcrystalline wax. A lubricant composition suitable for lubrication of a locked coil rope, characterized by comprising: 2. The composition according to claim 1, wherein component (a) is a paraffin lubricating oil having a viscosity of 50 to 500 cSt at 40°C. 3. The composition according to claim 1 or 2, wherein component (b) is polybutene with an average molecular weight of 5,000 to 10,000. 4. The composition according to any one of claims 1 to 3, wherein component (c) is a microcrystalline wax with a melting point of 60 to 80°C. 5. The composition according to any one of claims 1 to 4, further comprising lanolin, neutral barium naphthalene sulfonate, and an antioxidant.