CN102135507B - Method for testing and simulating dispersion of engine oil - Google Patents

Abstract

The invention relates to a method for testing and simulating the dispersion of engine oil, and belongs to chemical test methods. The method comprises the following steps of: adding test engine oil into 4 percent of carbon black; stirring and heating to 90 DEG C; mixing 20 percent of the test engine oil and 80 percent of n-pentane to obtain mixed solution; contacting standard blotting paper and the mixed solution at a contact area of 15 microliters, and blotting for one minute; putting the standard blotting paper into a test tube with the diameter of 200 millimeters, wherein 10 milliliters of the mixed solution is filled into the test tube; immersing the bottom of the standard blotting paper into the test tube until the carbon black is blotted to the top of the standard blotting paper; and judging by an electron microscope scanning method. The method has the advantages of simplifying the test procedure, saving labors and resources, shortening the time for preparing a rack, along with high operability, precision and repetitiveness; moreover, the method serves as a premise for selecting engine lubricating oil.

Description

The dispersed simulation experiment method of engine oil

Technical field

The invention belongs to chemical industry class test method, refer in particular to method the dispersed simulation test of engine oil.

Background technology

The correlative study of present domestic engine evaluated oil soot content mainly contains: people such as Zhang Chunhui, Zhao Gang, Tang Youyun, wangdan, Wang Aixiang all are introduced respectively several main mensuration soot content methods such as thermogravimetry (TGA), infra-red sepectrometry, filtration method, optical reflective sensor relative methods in the correlative study of diesel engine oil soot assay; Lu Qinying has introduced the situation of utilizing the thermogravimetric instrument to measure soot content in the I. C. engine oil; People such as Liu Gongde think that engine oil typical additives such as spreading agent type, decentralized viscosity index improver, high temperature detersive and antioxygen antiwear agent all have a significant impact the soot dispersive property of oil product in the research of heavy-duty oil soot dispersive property; Blue or green banners of summer Mack T-8 bench test method, the high soot lubricating oil engine rig test purge oil of development is a principal ingredient with hydrogenation 150N oil, mixing accent a little light gloss varnish is base oil, adds modulation such as detersive, spreading agent, antioxygen antiwear agent and forms; Lei Ailian etc. form mechanism by a simulation test machine research greasy filth, have proposed a kind of simulation evaluation method of estimating the gasoline engine oil dispersiveness.

Come engine evaluated oil soot content by engine rig test at present, but the engine rig test accidentalia is more, causes test findings repeatability relatively poor.And the test that engine oil soot dispersiveness is estimated is not also had suitable method at present.

Summary of the invention

The invention provides the dispersed simulation experiment method of a kind of engine oil, to solve the problem that the test of at present engine oil soot dispersiveness being estimated does not have appropriate method.

The technical scheme that the present invention takes is to comprise the following steps:

(1). will test machine oil and sneak into 4% carbon black;

(2). above-mentioned test machine oil of sneaking into 4% carbon black is stirred and heated to 90 ℃;

(3). form mixed liquor with above-mentioned volume fraction 20% test machine oil and 80% n-pentane, standard bibulous paper is contacted with it, the contact volume is 15 μ L, adsorbs 1 minute;

(4). this standard bibulous paper is put into the 200mm developmental tube, and developmental tube is equipped with the above-mentioned mixed liquor of 10mL, standard bibulous paper bottom is dipped in the developmental tube is drawn onto standard bibulous paper top up to carbon black;

(5). judge that with the Electronic Speculum scan mode 0=is white, the whole black in each zone of 100=all, the whole height of this standard bibulous paper are divided into 38 sections from top to bottom, whole zone leveling scoring from 0 to 3800.

Advantage of the present invention is can the short form test program, uses manpower and material resources sparingly and prepares the stand time, and is workable, the precision height, and good reproducibility can be as the prerequisite basis of screening engine oil.

Embodiment:

(1). will test machine oil and sneak into 4% carbon black;

(2). above-mentioned test machine oil of sneaking into 4% carbon black is stirred and heated to 90 ℃;

(3). form mixed liquor with above-mentioned volume fraction 20% test machine oil and 80% n-pentane, standard bibulous paper is contacted with it, the contact volume is 15 μ L, adsorbs 1 minute;

(4). this standard bibulous paper is put into the 200mm developmental tube, and developmental tube is equipped with the above-mentioned mixed liquor of 10mL, standard bibulous paper bottom is dipped in the developmental tube is drawn onto standard bibulous paper top up to carbon black;

(5). judge that with the Electronic Speculum scan mode 0=is white, the whole black in each zone of 100=all, the whole height of this standard bibulous paper are divided into 38 sections from top to bottom, whole zone leveling scoring from 0 to 3800.

Adopt method of the present invention to carry out the dispersed simulation test of engine oil, concrete replica test the results are shown in Table 1.

The concrete replica test result of table 1

Data analysis:

Arithmetic mean:

=(600+599+600+600+601)/5=600

=[（600-600） ²+（599-600） ²]+（600-600） ²+（600-600） ²+(601-600) ^?2]/(5-1)

=2/4

=0.5

Standard deviation: S=

=0.7071068

Relative standard deviation: RSD=(S/

) * 100%=0.118%.

Claims (1)

1. the dispersed simulation experiment method of engine oil is characterized in that comprising the following steps:

(1). will test machine oil and sneak into 4% carbon black;

(2). above-mentioned test machine oil of sneaking into 4% carbon black is stirred and heated to 90 ℃;

(3). with volume fraction is that the test machine oil that obtains of 20% step (2) and the n-pentane of volume fraction 80% are formed mixed liquor, and standard bibulous paper is contacted with it, and the contact volume is 15 μ L, adsorbs 1 minute;

(4). this standard bibulous paper is put into the 200mm developmental tube, and developmental tube is equipped with the above-mentioned mixed liquor of 10mL, standard bibulous paper bottom is dipped in the developmental tube is drawn onto standard bibulous paper top up to carbon black;

(5). judge that with the Electronic Speculum scan mode 0=is white, the whole black in each zone of 100=all, the whole height of this standard bibulous paper are divided into 38 sections from top to bottom, whole zone leveling scoring from 0 to 3800.