Method of determining colloidal stability of grease and device for realising said method

FIELD: chemistry.

SUBSTANCE: method of determining colloidal stability of grease is realised from the amount of oil squeezed from the grease, where a cup full of grease with a piston and fitted with an oiled filter together with a set of dry filters is subjected to thermal stabilisation and subsequently held under a load, after which the amount of oil squeezed from the grease into the dry filters is determined. Before thermal stabilisation, a medium boundary is created between the analysed grease and the dry filters by separating them from each other in order to prevent penetration of oil into the dry filters before loading. The amount of oil squeezed from the grease is determined from the displacement of the piston during loading. The invention also discloses a device for realising the said method.

EFFECT: more reliable determination.

4 cl, 1 dwg

 

The invention relates to the field of study of physico-chemical properties viscous products and can be used in laboratories petrochemical or other industries related to the study of viscous products such as greases.

The colloidal stability of the grease is, as is well known, the resistance of the lubricant to the separation of oil. Therefore, the colloidal stability can be defined as the mass fraction of the oil separated from the grease. There is a method of determining the colloidal stability according to GOST 7142-74, which consists in determining the amount of oil, pressed from the lubrication to dry the filters. The method includes weighing the empty Cup from the piston and filter, oil-impregnated, filling a Cup with a piston of the investigated sample and the weighing, keeping filled investigated the breakdown of a Cup and a piston in thermostat 30 minutes After keeping the samples in thermostat Cup with the piston is kept under load for 30 minutes Under the load of the analyzed sample set of dry filters opressively oil. The remainder of the investigated samples together with the Cup and the piston and pre-oiled filter is weighed. The weighting is carried out with accuracy is 0.0002, Colloidal stability is determined by the ratio of the amount released during 30 min of oil to the weight of the lubricant. MA is Sova the share of oil, pressed from grease, or the colloidal stability of X, in percent, is calculated by the formula:

X=(m1-m2)/m×100%,

where m1is the mass of the Cup with grease and oil-impregnated ashless filter before the test, g;

m2is the mass of the Cup with grease and oil-impregnated ashless filter after the test, g;

m is the mass of the test grease,

To implement this method, you use the device according to GOST 7142-74 (M.: Publishing house of standards, 1996, pereezd.), containing tripod bracket, guide sleeve which can move the rod with a cargo full of grease Cup with piston, oiled filter laid on a surface lubricant, a set of dry filters located above Promyshlenny filter, cover glass, cargo clamp (steel washer), a water or oil bath to provide thermal stabilization, the unit loading of the piston. Block loading of the piston includes a metal ball to transfer pressure, the rod with the load, the launch button for load holding and lowering at the time of loading.

This method and apparatus has the following disadvantages. The method is tedious, as it requires a careful weighing of the investigated samples before and after the test. The device for implementing the method provides for thermal stabilization of the cassette assembled - filled grease Cup with a piston oiled filter set the dry filters, cover glass and steel washer that provides the clamping edge of the cassette to the filters. When the temperature stabilization before opressovki is the penetration of oil, grease over oiled the filter to dry the filters due to the capillary effect, the weight of the piston and thermal expansion of the lubricant, which affects the accuracy of the method. The weight of the piston distorts the results of the tests and directly under opressovki.

The objective of the invention is to improve the accuracy of determining the colloidal stability of greases, as well as reducing the complexity of its definition.

The technical result is the elimination of spontaneous penetration of oil on dry filters during thermal stabilization and excluding the impact of the weight of the piston on the test results.

The technical result is achieved by a method for determining the colloidal stability of greases on the amount of oil, pressed from grease, which is filled with grease Cup with the piston and laid on her Promyshlenny filter together with a set of dry filters are subjected to thermal stabilization and subsequent shutter speed under load, and then determine the amount of oil, pressed from the lubrication to dry the filters, which, unlike the prototype, before heat setting create an environment section between the test lubricant and dry filter, the AMI by separating them from each other to prevent penetration of oil into the dry filters before loading, and the amount of oil, pressed from grease, determined by the movement of the piston in the process of loading.

The heat setting can be performed for 30 min at a temperature of (20±2)°, opressovku can also be carried out for 30 min, and the colloidal stability of X, in percent, can be calculated by the formula: X=Δh/N×100%,

where H is the initial height of the lubricant above the piston,

Δh is the displacement of the piston during opressovki.

The method implements the device to determine the colloidal stability of greases containing the filled grease Cup with piston, oiled filter laid on a surface lubricant, a set of dry filters located above Promyshlenny filter, cover glass, cargo clamp, " oven " node and the power loading of the piston, which, unlike the prototype, " oven " node has a rotary latch, cargo clamp and the block loading of the piston is a lever shift measuring system comprising a measuring effort of loading, and the Cup with the piston installed in thermostatic site so that the application of force loading on the piston is at the bottom.

To measure the effort of loading you can use the load cell.

Diagram of the device for determining the colloidal stability shown in the drawing. The callout on the drawing, p is found: a) the stage of stabilization, b) stage opressovki.

The device contains a filled grease 1 Cup 2 with a piston 3, oiled filter 4 placed on a surface lubricant, a set of dry filters 5, located above Promyshlenny filter cover glass 6, the load of the clamp 7, " oven " node, including the radiator 8, thermocouple 9, " oven " plate 10, the rotary latch cargo clamp 11, the insulating plate 12, and the power loading of the piston, which represents the load lever system comprising a load cell 13, the lever 14, the support 15, the ball plunger 16, the stepping motor 17, the transducer rotational movement into translational 18, spring compensator 19.

The method is as follows.

Filled with lubricant 1 Cup 2 with a piston 3 and put the grease Promyshlenny filter 4 is installed in the " oven " node (thermostat). In the cylindrical socket swivel latch cargo 11 fit kit dry filter 5, the cover glass 6, the insulating plate 12, clamping the load 11. When this rotary latch is in the position that provides the environment section between the test lubricant 1 (which is oiled filter) and dry filters 5 to prevent inadvertent penetration of the oil into the dry filters during the subsequent thermostability the tion (Posa) in the drawing).

After thermal stabilization (30 min) on oiled filter 4 by the lock cargo 11 lower package dry filters 5 with the cover glass 6 and press through the insulating plate 12 cargo 7 weighing 1200 g (position b) in the drawing).

The load on the piston to provide a lever system. Force loading create a spring compensator 19 using the stepper motor 17. To measure the effort of loading using the load cell 13. Include a stepper motor 17. Converter rotary motion into reciprocating movement 18 through the spring compensator 19 raises the lever 14, creating the specified loading on the piston 3.

At the moment of contact of the ball 16 with the end of the piston rod 3, an additional reaction arm on the support 15 of the load cell 13. Taking into account the ratio arms of the lever (L1/L2sensor will capture effort F:

F=1000×(L1/L2)(g).

When the preset force loading is given the signal to a reference time (30 min), during which ompressive oil. This stepper motor 17 processes the error signal with the specified load, maintaining a constant force on the piston rod. The amount of opressovki Δh is defined as the conversion result of the rotational motion of the stepper motor into linear motion Δh1taking into account the shoulders ry the most important system:

Δh=(K×N)×(L2-L1)/L2,

where K is the transfer coefficient, mm/step;

N is the total number of steps of the stepper motor from the system output to the desired loading force F to the end of analysis.

Under certain assumptions that the density of the test lubricant before the test and the density of the remainder of the lubricant after the test it can be argued that the mass parameters pressed lubrication connected with its volume. At the height of the lubricant above the piston H, which is proportional to the initial mass of the lubricant, and the movement of the piston during the analysis on the value of Δh is proportional pressed mass of lubricant displaced by the piston, the mass fraction of the oil, pressed from the lubricant, or the colloidal stability of X, in percent, can be calculated by the formula:

X=Δh/H×100%.

Thus, the proposed method and device to determine the colloidal stability of greases allow to increase the accuracy of the tests and significantly reduce their labor costs.

1. The way to determine the colloidal stability of greases on the amount of oil, pressed from grease, which is filled with grease Cup with the piston and laid on her Promyshlenny filter together with a set of dry filters are subjected to thermal stabilization and subsequent shutter speed under load, and then determine the number of mA is La, pressed from the lubrication to dry filters, characterized in that before heat setting create an environment section between the test lubricant and dry filters by separating them from each other to prevent penetration of oil into the dry filters before loading, and the amount of oil, pressed from grease, determined by the movement of the piston in the process of loading.

2. The method according to claim 1, characterized in that the heat setting is conducted for 30 minutes at a temperature of (20±2)°C, opressovku also hold for 30 min, and the colloidal stability of X in percent is calculated by the formula:
X=Δh/N·100%,
where H is the initial height of the lubricant above the piston;
Δh is the displacement of the piston during opressovki.

3. A device for determining the colloidal stability of greases containing the filled grease Cup with piston, oiled filter laid on a surface lubricant, a set of dry filters located above Promyshlenny filter, cover glass, cargo clamp, " oven " node and the power loading of the piston, characterized in that the " oven " node has a rotary latch, cargo clamp and the block loading of the piston is a lever shift measuring system comprising a measuring effort of loading, and the Cup with the piston installed in thermostatic site so that when agenie force loading on the piston is at the bottom.

4. The device according to claim 3, characterized in that to measure efforts in the loading of the load cell is used.



 

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