Conveyor lubricants including emulsions and methods employing them
The present disclosure relates to conveyor lubricant compositions including an emulsion. The present disclosure also relates to methods of employing such lubricant compositions. In an embodiment, the methods include applying the present lubricant composition to a conveyor with a non-energized nozzle. In an embodiment, the methods include applying the present lubricant composition in a “semi-dry” mode.
1. A method for lubricating the passage of a container along a conveyor, comprising:
diluting a lubricant concentrate with water to form a lubricant use solution, the lubricant concentrate comprising:
(a) about 1 to about 20 wt-% of water insoluble compounds selected from oleyl diamino propane, coco diamino propane, lauryl propyl diamine, dimethyl lauryl amine, alkyl C12-C14 oxypropyl diamine, and mixtures thereof;
(b) about 0 to about 20 wt-% emulsifier; and
(c) water,
applying the lubricant use solution to at least a portion of a container-contacting surface of the conveyor or to at least a portion of a conveyor-contacting surface of the container, the lubricant use solution comprising about 99.3 to about 99.99 wt-% water, inclusive of any hydrophilic diluents;
wherein the lubricant use solution is applied for a period of time and not applied for a period of time and the ratio of not applied:applied time is between 2:1 and 32:1, and wherein the not applied time is 12 minutes or less.
2. The method of claim 1 , wherein the water insoluble compound has a viscosity of at least about 300 centipoise when measured with a parallel plate rheometer with 20 mm plate diameter and 0.25 mm plate separation at an integrated average shear rate of 5.9 sec −1 .
3. The method of claim 1 , wherein the water insoluble compound is emulsified with the emulsifier, and the resulting emulsion in the concentrate has a particle size from about 0.05 to about 5 microns.
4. The method of claim 1 , wherein applying comprises applying the lubricant use solution for a first length of time and not applying it for a second length of time; wherein the ratio of the first length to the second length is about 1 to greater than or equal to about 10.
5. The method of claim 1 , wherein the lubricant concentrate further comprises an additional component.
6. The method of claim 1 , wherein applying the lubricant use solution maintains a coefficient of friction of less than about 0.4 over the entire period of use.
7. The method of claim 1 , wherein the container comprises polyethylene terephthalate, polyethylene naphthalate, polyethylene, polypropylene, paper board, glass, or metal.
8. The method of claim 1 , wherein the lubricant use solution has a pH from 8 to 14.
9. The method of claim 1 , wherein applying the lubricant use solution maintains a coefficient of friction below 0.2 during the not applied time.
10. The method of claim 1 , wherein the water insoluble compounds have a viscosity greater than 500 centipoise.
11. The method of claim 1 , wherein the water insoluble compounds have a viscosity greater than 1000 centipoise.
12. The method of claim 1 , wherein the emulsifier comprises two or more emulsifiers with different HLB values.
13. The method of claim 1 , wherein the emulsifier comprises ether carboxylic acids with linear or branched chain with greater than 6 carbon atoms.
14. The method of claim 1 , wherein the lubricant concentrate is an emulsion that does not phase separate in one month at 4 to 50° C.
15. The method of claim 1 , wherein the emulsion in the concentrate has an average particle size of less than about 10 μm.
16. The method of claim 1 , wherein the lubricant use solution comprises about 0.02 to 0.25 wt-% of the water insoluble compounds.
17. The method of claim 1 , wherein the lubricant use solution comprises about 0.05 to 0.15 wt-% of the water insoluble compounds.