MICROENCAPSULATION OF CHEMICAL ADDITIVES

摘要

The present disclosure relates to new and optimized processes for the preparation of micro- and nano-scale capsules containing lubricant chemical additives. The present disclosure also relates to micro- and nano-scale capsules prepared by such processes, which are useful in a variety of applications, including automotive lubricants, diesel lubricants, industrial lubricants, metal-working lubricants, coolants, and process fluids. Micro- and nano-scale capsules prepared as described herein have the required properties that such capsules need to exhibit in order to function effectively and meet the requirements imposed by engine lubrication conditions. The microcapsules may be dispersed in a lubricating oil such that the lubricant exhibits improved stability and anti-wear performance, thereby improving engine fuel efficiency and performance.

主权项

1. A process for preparing microcapsules of a chemical additive, the process comprising
(i) forming an aqueous solution comprising one or more emulsifiers; (ii) adding a curing catalyst and a cross-linking agent to the product of step (i) at a pH of between about 3.0 and about 4.0 to form an emulsion; (iii) adding one or more chemical additives to the emulsion of step (ii); (iv) adding a solution comprising (i) formaldehyde, paraformaldchyde or a combination thereof, and (ii) urea, melamine, or a combination thereof, to the product of step (iii); and (v) heating the product of step (iv) to form microcapsules of the chemical additive.