WO2005083042A1

WO2005083042A1 - Additive for two stroke fuel with lubrificating properties adapted to replace traditional two stroke oil and two stroke fuel

Info

Publication number: WO2005083042A1
Application number: PCT/SE2005/000302
Authority: WO
Inventors: Mats Selin
Original assignee: Mats Selin
Priority date: 2004-03-02
Filing date: 2005-03-02
Publication date: 2005-09-09

Abstract

The invention concerns a additive with lubricating properties for two stroke fuel, which comprises oil having a content of 10-90 %, preferably 10-60 %, and fuel alternatively a carbon compound having a content of 90-10 %, preferably 90-40 %, whereby the fuel alternatively the carbon compound comprises boron in solution or in suspension. The invention also concerns where a two stroke fuel the content of boron is in the interval 0,1-1.000 ppm, preferably 10-400 ppm and most preferred in the interval 150-250 ppm.

Description

O 2005/083042

Additive for two stroke fuel with lubricating properties adapted for replacing traditional two stroke oil and two stroke fuel

The present invention concerns an additive with lubricating properties adapted^' to be used such as an additive to fuel for two stroke engines replacing traditional two stroke oil and a two stroke fuel with added additive according to the invention.

It is previously known, for example from US 5,431,830, that boron can establish a complex ϋgand bond to several metals. This occurs after exposure in a time period or in a longer time period of for example hours to days. The used boron compounds forms in the present case two dimensional flakes, which slide against each other:, which brings low friction. Further, boron provides a corrosⁱon protection for metals, when the boron acid binds ±n a thin layer on the base metal surface and thus prevent oxidatⁱon thanks to its electronegativity, which makes boron to an effective reduction agent that prevents corrosion of exposed surfaces.

According to the known art, oil is mixed with a h±gh portion of boric acid, whereby the mix thereafter is diluted to about commonly 10% in different lubricsnt oils. According to the American patent document US 6,368,369 it is said that boric acid advantageously may be mixed into for example engine fuels in order to give a frict±on reduction effect. There the boric acid is mixed in a base oil The particle size of the boric acid, which commonly is between 0,5-20 micron, is generated through fox example "jet milling". Although, at tests it has been stated that for example an additive which is suitable for diesel fuel ϊ RECORD COPY - TRANSLATION Rule 12.4 through time achieves a limited stability. After some time, years, thus a relatively large risk is present that the boron acid particles aggregate, which of course could lead to fatal consequences for an engine, for example of diesel type. Also when boric acid particles are mixed in a base oil and thereafter diluted in fuel or oil mixed fuel or the like, the same risk occurs.

A problem with the usage of traditional two stroke oil as an additive to two stroke engines is that the emission, especially the particle emission, becomes so high, the same is true for the oil smoke in the exhaust gas.

The object of the present invention is to provide an additive to two stroke fuel as an alternative to a traditional two stroke oil and where, compared to a two stroke oil, a larger part of the oil content, preferably 10%-90%, most preferred 10%-60%, is replaced with fuel or alternately a carbon compound treated with at least one boron compound, i.e. comprising boron in solution. The fuel alternatively the carbon compound has a corresponding percentage of 90%-10%, most preferred 90%-40%. When mixing into two stroke fuel according to recommended mixing relationship as used for traditional two stroke oil, the oil amount is thus reduced in the fuel, with at least the same and often better lubrication, thanks to the friction reducing effect of the boron.

Thanks to the invention an additive with lubricating properties of the above kind has been provided, which in an excellent way fulfils its object as a replacement for a traditional two stroke oil and reduces friction, emission and oil smoke compared to a traditional two stroke oil. Additionally it has been shown that the additive has a corrosion inhibiting effect. Since the friction is reduced the wear of the motor decreases .

The invention implies basically that a boron compound with lubricating properties is present in solution or suspension in a liquid in order to later be used for dilution of oil in order to create an additive for two stroke fuel replacing traditional two stroke oil. The borate ions will thus make up an almost homogene phase together with the solvent and which solution or suspension under stable conditions then can be made to comprise a high concentration of borate, thanks to the hydrogen bonds of the chosen solvent, which preferably is a hydro carbon or an alcohol, prevents the electronegativity of the boron compound and its hence following inherent tendency to covalent bond. In the suspension the boron particles size up to 0,5 micro meters, preferably in the interval 1-100 nanometers, or even more preferably even smaller.

The invention will now be described below by means of some preferred embodiments.

The boron compounds which according to one example are dissolved or suspended according to the present invention are preferably boric acid BOH₃ or diborontrioxide B₂0₃ (boron oxide) , which offer especially good friction reducing properties. The solvent may be constituted by a hydro carbon and/or any alcohol, each one separately or in a chosen mix. Most alcohols may be used, for example ethanol, methanol etc. and the hydrocarbon may for example be ligroin or photogen. The solution or suspension is manufacturable by shaking boric acid or diborontrioxide in the solvent, possibly together with mechanical fine division elements. In the solution or suspension boron may be part of it in a content of up to 2.500 ppm or more if so desired, even substantially more, up to 250.000 ppm or more. The final additive is intended to be used in the same way as a traditional two stroke oil and ought to have a content of boron which preferably will be in the range 10-10.000 ppm, readily 100-400 ppm and most preferred in the range 1.500- 2.500 ppm. When the additive is to be added to a fuel, such as diesel or petrol, the final fuel mixture ought to have a content of boron that preferably is in the range 0,1-1.000 ppm, readily 10-400 ppm ' and most preferred in the range 150-250 ppm.

Claims

1. An additive with lubricating properties for two stroke fuel, characterised in that the additive comprises oil having a content of 10-90%, preferably 10-60%, and fuel alternatively a carbon compound having a content of 90- 10%, preferably 90-40%, whereby the fuel alternatively the carbon compound comprises boron in solution or in suspension.

2. An additive according to claim 1, wherein boron in solution or in suspension is obtained from the boron compound/compounds boric acid and/or diborontrioxide.

3. An additive according to claim 1 or 2, wherein the carbon compound is a hydrocarbon and/or an alcohol.

4. An additive according to claim 1, 2 or 3, wherein the content of boron is in the interval 10-10.000 ppm, preferably 100-4.000 ppm and most preferred in the interval 1.500-2.500 ppm.

5. A two stroke fuel comprising an additive according to any one of the preceding claims, characterised in that the content of boron is in the interval 0,1-1.000 ppm, preferably 10-400 ppm and most preferred in the interval 150-250 ppm.