CN115856266A - A rapid method for evaluating the long-term demulsibility of lubricating oil products - Google Patents

Abstract

The invention discloses a method for rapidly evaluating long-term demulsification of lubricating oil products, which comprises the steps of storing lubricating oil products to be tested by a storage device to pretreat the products, and then performing demulsification test on the pretreated lubricating oil products; the pretreatment comprises the step of carrying out sealed storage treatment on lubricating oil products by a storage device, wherein the storage condition is 0.2-0.3MPa, and the storage temperature is 100-120 ℃. The method can quickly detect the long-term demulsification performance of the oil product by pretreating the oil product to be detected for a period of time, and greatly saves the waiting time for detection.

Description

A rapid method for evaluating the long-term demulsibility of lubricating oil products

technical field

The invention relates to the field of lubricating oil performance testing, in particular to a method for quickly evaluating the long-term demulsibility of lubricating oil products.

Background technique

The ability of lubricating oil and water to form an emulsion and then separate to form two phases under the action of mechanical stirring is called the degree of demulsification. The shorter the time for oil and water to form an emulsion and then separate to form two phases, the better the oil quality The stronger the demulsification ability, the better the demulsification degree. On the contrary, if the oil and water separate to form two phases, the longer the demulsification ability of the oil is.

Oil products are inevitably in contact with water or water vapor during use. After the two form an emulsion, the strength of the oil film will be significantly reduced, thereby reducing the lubricating performance of the oil, increasing the friction between mechanical parts, and causing mechanical damage. ; The water mixed in the oil will also corrode the metal parts and promote the rust of the parts; therefore, the demulsibility is an important index to evaluate the performance of the oil.

Some oils have excellent demulsification performance when they are just produced, but as the storage time increases, the demulsification performance will gradually deteriorate; such as trimethylolpropane oleate used in fire-resistant hydraulic oil , it is required that the demulsification time of the oil product is <30min within 12 months (the test method is GB/T 7305), but since the demulsification performance of the oil product will gradually deteriorate over time, it is often difficult to monitor in reality And ensure that the demulsification time of the produced oil is less than 30 minutes within 12 months; the performance evaluation of the newly produced lubricating oil requires long-term continuous testing to know whether the product meets the requirements. The experimental data shows that the demulsification time of the newly produced trimethylolpropane oleate is <10min, and after 15 days at room temperature, the demulsification time rises to 25min, and the demulsification time may be >30min after continued storage. Therefore, it is very necessary to develop a method that can quickly detect the long-term demulsibility of lubricating oil products, which can more efficiently detect the long-term demulsibility of oil products, thereby ensuring the quality of oil products and saving product testing time.

Contents of the invention

The technical problem to be solved by the present invention is to propose a method for quickly evaluating the long-term demulsibility of lubricating oil products, which can solve the problem that the prior art cannot evaluate the long-term demulsifying properties of lubricating oil products in a short time.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions to achieve:

A method for quickly evaluating the long-term demulsibility of lubricating oil products, using a storage device to store lubricating oil products for pretreatment of the oil products, and then performing a demulsibility test on the pretreated lubricating oil products; wherein, lubricating oil products The water content of oil and oil products is 500-1000ppm; the device is filled with dry air to control the pressure in the container to 0.2-0.3MPa, and the storage temperature is 100-120°C.

The storage device used in the present invention is a sealed pressure-resistant device, which includes a heating base and a sealing mechanism on the heating base. The sealing mechanism includes a sleeve and a sleeve cap, and the sleeve cap is sleeved on the upper opening of the sleeve; The sleeve cap is also connected with a through valve, the interface of the through valve is connected with the inside of the sealing mechanism, and the interface of the through valve is connected with the inflation device, which can fill the gas into the sealing mechanism to increase the air pressure in the sleeve tank; in addition, the sleeve cap is installed There are pressure sensors and temperature sensors, which respectively display the pressure and temperature in the sealing mechanism; the sleeve tank is equipped with a glass liner, and the oil product to be tested and a magnetic stirrer are arranged in the glass liner; the functions of the sleeve tank and the sleeve cap It is to support the glass liner to maintain its stability;

The heating base has a built-in electric heating module and a temperature control module. The heating base is provided with a slot for the sealing mechanism, and the sealing mechanism is inserted into the slot as a whole. Heating, the heat is transferred to the oil in the glass liner, and the temperature of the oil and the pressure in the sealing mechanism are detected by the pressure sensor and the temperature sensor.

Preferably, the stirring rate is 100-300rpm, and the pretreatment time is 12-72h.

As preferably, the loading amount of the oil to be tested in the glass test tube is 50-150g.

Preferably, the through valve is a needle valve.

Preferably, in order to further ensure the airtightness of the sealing mechanism, a fluorine rubber pad is used to seal the seam between the sleeve and the sleeve cap, and a quick-release clamp is used to fix the connection between the sleeve and the sleeve cap.

The specific operation of this method: add the oil to be tested with controlled water content and a magnetic stirrer into the glass liner, put the glass liner into the sleeve tank of the sealing mechanism, cover it with a cap and fix it with a quick-open clamp, Start the heating program of the heating base, and turn on the magnetic stirring. After controlling the specified temperature, fill a certain amount of dry air into the sealing mechanism through the through valve on the cap to control the pressure required to maintain the experimental conditions in the jacket tank. After a period of pretreatment, the temperature is lowered to normal temperature, and the pressure in the tank is slowly released through the valve, and the oil in the glass liner is taken out, and the demulsification performance test of the oil is carried out according to GB/T 7305 petroleum and synthetic oil-water separation method.

Compared with prior art, the beneficial effect that the present invention has is:

The invention can quickly detect the long-term demulsification performance of the oil product by pretreating the oil product to be tested for a period of time, and greatly saves the waiting time for detection.

Description of drawings

FIG. 1 is a schematic structural view of the storage device of the present invention.

In the figure: heating base 1, sealing mechanism 2, sleeve tank 21, sleeve cap 22, through valve 3, pressure sensor 4, temperature sensor 5.

Detailed ways

In order to allow those skilled in the art to understand the present invention more clearly and intuitively, the present invention will be further described below in conjunction with the accompanying drawings.

Example 1

As shown in Figure 1, this embodiment proposes a storage device for pretreatment of lubricating oil products, which is a sealed pressure-resistant device, including a heating base 1 and a sealing mechanism 2 on the heating base 1. The sealing mechanism 2 includes a sleeve 21 and a sleeve cap 22, and the sleeve cap 22 is sleeved on the opening of the upper end of the sleeve 21; Connected, the interface 2 of the through valve 3 is connected to the inflatable device, and the gas can be filled into the sealing mechanism 2 through the inflatable device to increase the air pressure in the sleeve tank 21; in addition, the sleeve cap 22 is equipped with a pressure sensor 4 and a temperature sensor 5, respectively indicating the sealing The pressure and temperature in the mechanism 2; a glass liner is provided in the cover tank 21, and an oil product to be tested and a magnetic stirrer are arranged in the glass liner;

The heating base 1 has a built-in electric heating module and a temperature control module. The heating base 1 is provided with a slot for inserting the sealing mechanism 2, and a speed-controllable magnetic stirring module is provided below the slot. In this embodiment, the heating module, temperature control module and magnetic stirring module in the heating base 1 are not the improvement points of this application, and the components in the prior art can be directly selected, and it is enough to provide the required conditions for the storage device.

The stirring rate set by the magnetic stirring module is 100-300rpm, and the pretreatment time is 12-72h.

The loading amount of the oil to be tested in the glass liner is 50-150g.

Pass valve 3 is a needle valve.

In order to ensure the airtightness of the sealing mechanism 2, a fluorine rubber gasket is used to seal the joint between the sleeve tank 21 and the sleeve cap 22, and a quick-opening clamp is used to fix the joint between the sleeve tank 21 and the sleeve cap 22.

Example 2

Take multiple parts of newly produced trimethylolpropane oleate 80g and magnetic stirrer into different glass liners, and put them into different sealing mechanisms, put the sealing mechanisms into the slots of the heating base, and turn on Magnetic stirring, the speed is set to 150rpm, the temperature is raised to 110°C, the pressure in the container is filled with dry air to control the pressure to 0.2MPa, and the storage state is maintained. After 12-72h, the oil is taken out for demulsibility testing.

Demulsibility test results of oil samples after pretreatment:

Demulsification time Oil samples not pretreated after production 6min Pretreatment 12h oil sample 10min Pretreatment 24h oil sample 14min Pretreatment 48h oil sample 22min Pretreatment 60h oil sample 27min Pretreatment 72h oil sample 29min

Demulsibility test results of oil samples placed at room temperature and pressure:

Demulsification time 7 days 11min 14 days 15min 30 days 21min 6 months 28min 12 months 30min

The demulsification time of pretreatment for 24 hours is roughly the same as that of 14 days, pretreatment of 48 hours is roughly the same as that of 30 days, pretreatment of 60 hours is roughly the same as that of 6 months, pretreatment of 72 hours is roughly the same as that of 12 months. It can be known that the lubricating oil is pretreated for 72 hours, and the demulsibility of the normal temperature for 12 months can be estimated, thereby, through the pretreatment method of the present invention, the long-term (12 months) demulsibility of the oil can be quickly evaluated , so that it can quickly judge whether the oil meets the requirements, which greatly saves time.

Example 3

Take multiple portions of 80g of pentaerythritol oleate and magnetic stirrer that have just been produced and put them into different glass liners, and put them into different sealing mechanisms. Put the sealing mechanism into the slot of the heating base, turn on the magnetic stirring, and rotate Set it to 300rpm, raise the temperature to 120°C, fill the container with dry air to control the internal pressure to 0.25MPa, maintain the storage state for 12-72h, then take out the oil for demulsibility test.

Demulsibility test results of oil samples after pretreatment:

Demulsification time Oil samples not pretreated after production 9min Pretreatment 12h oil sample 12min Pretreatment 24h oil sample 18min Pretreatment 48h oil sample 28min Pretreatment 60h oil sample 32min Pretreatment 72h oil sample 34min

Demulsibility test results of oil samples placed at room temperature and pressure:

Demulsification time 7 days 11min 14 days 19min 30 days 29min 6 months 32min 12 months 35min

The demulsification time of pretreatment for 24 hours is roughly the same as that of 14 days, pretreatment of 48 hours is roughly the same as that of 30 days, pretreatment of 60 hours is roughly the same as that of 6 months, pretreatment of 72 hours is roughly the same as that of 12 months. It can be known that the lubricating oil is pretreated for 72 hours, and the demulsibility of the normal temperature for 12 months can be estimated, thereby, through the pretreatment method of the present invention, the long-term (12 months) demulsibility of the oil can be quickly evaluated , so that it can quickly judge whether the oil meets the requirements, which greatly saves time.

The above description of the embodiments is for those of ordinary skill in the technical field to understand and apply the present invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments, and apply the general principles described here to other embodiments without creative effort. Therefore, the present invention is not limited to the embodiments herein, and improvements and modifications made by those skilled in the art according to the disclosure of the present invention should fall within the protection scope of the present invention.

Claims (9)

1. A method for rapidly evaluating the long-term demulsification performance of a lubricating oil product is characterized in that a storage device is adopted to store the lubricating oil product to be tested to pretreat the product, and then the demulsification performance of the pretreated lubricating oil product is tested;

the pretreatment comprises the step of carrying out sealed storage treatment on lubricating oil products by a storage device, wherein the storage condition is 0.2-0.3MPa, and the storage temperature is 100-120 ℃.

2. The method of claim 1, wherein the lubricating oil product has a water content of 500 to 1000ppm.

3. The method as claimed in claim 1, wherein the storage device comprises a heating base and a sealing mechanism on the heating base, the sealing mechanism comprises a sleeve tank and a sleeve cap, the sleeve cap is sleeved on an opening of the sleeve tank, a through valve is connected on the sleeve cap, a first interface of the through valve is communicated with the inside of the sealing mechanism, and a second interface of the through valve is connected with an inflating device; in addition, a pressure sensor and a temperature sensor are arranged on the sleeve cap and respectively display the pressure intensity and the temperature in the sealing mechanism; a glass inner container is arranged in the sleeve tank, and an oil product to be detected and a magnetic stirrer are arranged in the glass inner container;

an electric heating module and a temperature control module are arranged in the heating base, a slot of a sealing mechanism is arranged on the heating base, and a magnetic stirring module capable of controlling the speed is arranged below the slot.

4. The method of claim 3, wherein the stirring speed of the storage device is 100-300rpm.

5. The method of claim 3, wherein the loading of the oil to be tested in the glass liner is 50-150g.

6. The method as set forth in claim 3, wherein said through valve is a needle valve.

7. The method of claim 3, wherein the seam between the canister and the cap is sealed with a fluororubber gasket and secured at the junction of the canister and the cap using a quick-release clip.

8. The method of claim 1, wherein the pretreatment time is from 12 to 72 hours.

9. The method of claim 1, wherein the oil to be tested is selected from trimethylolpropane oleate and pentaerythritol oleate.

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