FR2701271A1 - Lubricating remetallising product intended especially for vehicle heat engines - Google Patents

Abstract

According to the invention it includes a mixture consisting of at least: - finely divided uncomplexed pulverulent metallic agents, - grinding agents, - thixotropic and antisedimentation agents, - a viscous lubricating and dispersing substrate. Application to the field of lubrication of vehicle heat engines.

Description

 The present invention relates to a remetallizing lubricant product intended in particular for thermal engines of vehicles or static materials. It will find its application in all sectors of the economic activity in which it is necessary to lubricate and remétaliser mobile mounted parts on the move.

 Currently, for greasing internal combustion engines and rotating and / or slidable machine components, lubricating oils are used which are generally adapted to provide the proper lubricating capacity in the desired temperature range.

 Furthermore, when the known motor oils are used for the lubrication of an internal combustion engine, a turbulent flow is observed, oily fluid boundary layers of 5 to 20 μm thick between the slippery or rotating surfaces. compared to others, particularly because of the low roughness of metal surfaces.

 Thus, in practice, it has been thought that, in order to increase the efficiency of the engines, it is desirable to replace the turbulent flow of the lubricating oil layer with a laminar flow obtained, for example, via additives. .

 This is the reason why currently various additives are used to improve the lubrication properties, durability and similar properties of lubricating oils. Furthermore, it is also known to add to these oils additives such as detergents, antioxidants, corrosion inhibitors, anti-wear agents and anti-friction agents as well as anti-foam agents.

 It is also known to add additives to ensure the lubrication of the friction surfaces when they are subjected to mechanical conditions of extreme operating stress. It may for example be compounds containing molybdenum disulfide or other complexed metal compounds which reduce friction.

 Due to the operating conditions of these mechanical devices, there is a long-term wear, for example of the chamber of a piston of a heat engine, which can lead to a deterioration of the mechanical performance of the vehicle and even, in some cases , more damage from it.

 It is for this reason that it is known to add to the lubricating oils of the engines of metallizing metal vehicles intended to reduce the wear of the metal in friction. Such products comprise a dispersion of micro-particles of copper, zinc and silver associated with additives and / or supports.

 However, in practice, such products do not always provide satisfaction particularly in terms of improvements in thermal efficiency capabilities of the engine.

 It should also be noted that such products are of a high price which limits the capacity of use.

 The present invention aims to overcome the drawbacks of currently known products by providing a remetallizing lubricant product, especially for thermal engines of vehicles or static materials, which ensures an increase in yields and performance of the engine while being a manufacturing price compatible with such uses.

 Another advantage of the lubricating remetallizing product according to the invention lies in the fact that it can be manufactured in large batches from components with a low purchase price and without requiring the intervention of complex means which makes it possible to produce it. Low cost.

 Another advantage of the lubricant remetallizing product according to the invention lies in the fact that in addition to the remetallizing properties, it has lubricating properties which has the consequence of increasing the dynamic performance of the engine.

 Another advantage of the product according to the invention lies in the fact that it can be used as a protection of the parts but also to remedy the micro-porosities resulting from the wear of these parts.

 Other objects and advantages of the present invention will become apparent from the following description which is given for information only and which is not intended to limit it.

 The subject of the present invention is a lubricant remetallizing product, intended in particular for thermal engines of vehicles or other devices or machines which comprise parts which rotate and / or which slide and in which lubricating oils are used in a to ensure the proper lubricating capacity in the desired temperature range.

According to the invention, this product comprises a mixture consisting of at least
pulverulent metallic agents which are not complexed and finely divided,
- grinding agents,
thixotropic and anti-sedimenting agents,
a lubricating viscous agent.

The product according to the invention is prepared by a mixture which comprises in percentage
from 20 to 40% of finely divided non-complexed metal agents,
from 0.2 to 20% of grinding agents,
from 0.1 to 0.5% of thixotropic and anti-sedimenting agents,
from 79.7 to 59.4% lubricant viscous support, the sum of the components being equal to 100% by weight.

In addition, according to the invention, the finely divided, uncomplexed metal agents comprise at least percent by weight
from 19.2 to 37.5% copper,
from 0.5 to 1.5% of zinc,
from 0.3 to 1% of aluminum, the sum of these metal agents being equal to 20 to 40% of the percentage of the total weight of the product.

 It should also be noted that the invention is based on the observation that the presence of these metal agents and their affinity, in the form of microparticles with a particle size of between 1 m to 5 wm, do not have any abrasive effect on the surface. piston and / or the chamber but instead, fill the irregularities and / or micro-roughness of the surface of a few um of depth that are always present especially as a result of wear resulting from the friction of the moving surfaces.

 Thus, one obtains, a refilling and a resurfacing of these micro-asperities resulting from wear.

 Furthermore, a change in the flow of the lubricating fluid is also observed and in particular the turbulent flow characteristic of the boundary layer is modified in the oil film to become a type of laminar flow thus reducing the friction resistance. in the machine or engine.

 It should also be noted that when the particles have a particle size of approximately 1 m, they form a lubricating film on the surfaces, which has the consequence of increasing the internal mechanical efficiency of the machine and / or the engine as well as reducing the fuel consumption of it.

 It should also be noted that the efficiency of the combustion of the engine is improved so that the content of exhaust gas such as carbon monoxide is reduced, which has the effect of reducing the emissions of these into the atmosphere when the vehicle is in working order.

 Furthermore, according to the invention, the grinding agents are constituted by dodecylbenzene solvents or, by any other suitable derivative which has or, by any other appropriate derivative which has suitable properties.

 As regards the thixotropic and anti-sedimenting agents, they consist of an emulsion containing in particular various dispersing agents such as white spirit or other equivalents.

 The viscous support is constituted by an oil of low viscosity such as for example a paraffinic mineral base oil marketed by FINA under the quality 80 NEUTRAL.

As an example, on a vehicle marketed under the brand CX Diesel by the Company
CITROEN, after 1,800 km of circulation, a change in the compression ratio of the cylinders was noted as indicated in the table below.

<Tb>

<SEP>SEP>SEP> Compression
<tb><SEP> NO <SEP> PRODUCT <SEP> WITH <SEP> PRODUCT
<tb> Cylinder <SEP> 1 <SEP> 18 <SEP> 30
<tb> Cylinder <SEP> 2 <SEP> 19 <SEP> 30
<tb> Cylinder <SEP> 3 <SEP> 17 <SEP> 29
<tb> Cylinder <SEP> 4 <SEP> 20 <SEP> 30
<Tb>
In addition, the use of a product according to the invention can of course have variable proportions of constitution depending on the type of application and / or the desired result.

 Likewise, because of its dilution with respect to the total volume of the lubricating oil used, it can not in any case modify the rehology of the oil used for the lubrication of all the mechanical parts of the vehicle and / or of the machine.

 Of course, other implementations of the present invention could have been envisaged without departing from the scope thereof.

Claims (8)

 1. Lubricating remétallisant product, intended in particular for thermal engines of vehicles, or static materials, characterized in that it comprises a mixture constituted by at least  finely divided non-complexed pulverulent metallic agents,  - grinding agents,  thixotropic and anti-sedimenting agents,  a viscous lubricant support.  2. Lubricating remetallizing product according to claim 1, characterized in that it comprises in percentage by weight of  20 to 40% finely divided non-complexed metal agents,  0.2 to 20% of grinding agents,  0.1 to 0.5% of thixotropic and antisedimentant agents,  - 79.7 to 59.4% of viscous support lubricant the sum of the components being equal to 100% by weight.  3. lubricating remetallizing product according to claim 1, characterized in that the finely divided, non-complexed metal agents comprise at least:  - copper,  - zinc,  - aluminum.  4. lubricating remetallizing product according to claim 3, characterized in that the metal agents comprise at least as a percentage of weight  from 19.2 to 37.5% copper,  from 0.5 to 1.5% of zinc,  from 0.3 to 1% of aluminum, the sum of these components being equal to 20 to 40% of the percentage by weight of the total weight of the remetallizing product.  5. Lubricating remetallizing product according to claim 3, characterized in that the metal agents are constituted by microparticles having a particle size of between 1 and 5 μm.  6. lubricating remetallizing product according to claim 1, characterized in that the grinding agents are constituted by dodecylbenzene solvents.  7. Lubricating remetallizing product according to claim 1, characterized in that the thixotropic and anti-sedimenting agents consist of an emulsion containing white spirit.  8. Lubricating remetallizer product according to claim 1, characterized in that the viscous support is constituted by an oil of low viscosity.