CN101899355B - A kind of lubricating oil composition with antioxidation performance and preparation method thereof - Google Patents

Abstract

The invention provides a lubricating oil composite with oxidation resistance, which comprises the following components: 1) plenty of lubricating oil basic oil and 2) tetrabutyl titanate with the content of 1-15w% by taking the weight of the lubricating oil basic oil as a standard. The lubricating oil composite provided by the invention has original lubricating property and obviously improved oxidation stability, and can be used under more rigorous working conditions such as high temperature, high pressure and the like, thereby having wide application environment and market prospect.

Description

A kind of lubricating oil composition with antioxidation performance and preparation method thereof

technical field

The invention relates to a lubricating oil composition, in particular to a lubricating oil composition with anti-oxidation performance and a preparation method thereof.

Background technique

At present, machinery operating under severe conditions such as high temperature and high pressure generally use graphite lithium-based grease, graphite calcium-based grease and 24# cylinder oil as lubricants, but when the operating temperature exceeds a certain limit, the lubricant is extremely prone to failure. resulting in massive losses. This is mainly because the lubricant is easily oxidized at high temperature. Therefore, many scholars have done a lot of research work on improving the oxidation stability of lubricants. At present, it is more commonly used to add antioxidants. However, according to some studies, it is reported that the addition of antioxidants will have some adverse effects on lubricants. Especially for grease, it has been reported that the addition of antioxidants will increase the consistency of the grease, while also reducing the dropping point of the grease. Therefore, some people hope to find an additive that can be directly added to the base oil to improve the anti-oxidation performance of the lubricant, and can also increase the dropping point of the grease, thereby increasing the service temperature of the lubricant.

In the prior art, tetrabutyl titanate is mainly used in organic synthesis and is a very good catalyst. After it is loaded, it can play a very good catalytic effect at 100-200 °C, and it does not pollute the environment itself. , post-processing is easy and can be reused, and the most common application is in the synthesis of ester compounds, such as diisooctyl phthalate and other plasticizing materials (Chen Zhiqiang, Sun Aili, Wu Zhifu "Catalytic Synthesis of Tetrabutyl Titanate Dioctyl phthalate" "Henan Science", June.2006, vol24, NO3).

So far, no reports of tetrabutyl titanate as an antioxidant have been found in the prior art.

Contents of the invention

The invention provides a lubricating oil composition with anti-oxidation performance.

The present invention also provides a preparation method of the above lubricating oil composition.

The present invention also provides a use of tetrabutyl titanate.

The invention also provides a method for improving the oxidation stability of the lubricating base oil.

The lubricating oil composition provided by the invention comprises the following components:

1) A large amount of lubricating oil base oil,

2) Based on the weight of lubricating oil base oil, the content of tetrabutyl titanate is 1-15w%.

The lubricating base oils include, but are not limited to, mineral oils, vegetable oils and ester oils. Wherein the mineral oil can be selected from paraffinic crude oil base oil, intermediate crude oil base oil and/or naphthenic oil, and the viscosity index range can be -20～130, for example paraffinic crude oil base oil can be selected from 150BS, 500SN, 650SN, 100SN, 75SN, etc.; intermediate base crude oil base oil can be selected from one or more of 60ZN, 150ZN, 300ZN, 500ZN, 900ZN, etc.; naphthenic oil can be selected from 60DN, 150DN, 300DN, 500DN, 900DN, etc. one or several. The vegetable oil can be refined oil, unrefined crude oil, or even waste oil, with an acid value ranging from 0.05 to 10 mgKOH/g, such as castor oil, peanut oil, soybean oil, rapeseed oil, etc. The ester oil can be selected from base oils such as dioctyl sebacate, trimethylolpropane, dioctyl adipate, dioctyl phthalate, dibutyl phthalate, etc. species or several.

The content of tetrabutyl titanate is 1-15w%, preferably 2-10w%, more preferably 3-7w%.

The preparation method of the lubricating oil composition provided by the present invention comprises: mixing and stirring tetrabutyl titanate and lubricating oil base oil at a temperature of 10 to 120°C, preferably at a temperature of 20 to 100°C, more preferably at a temperature of 30 to 80°C, for 15 minutes to 6 hours, preferably 1 hour to 4 hours.

The invention provides a use of tetrabutyl titanate, comprising: adding tetrabutyl titanate to a composition containing a lubricating base oil to improve the oxidation stability of the lubricating base oil, and the weight of the lubricating base oil is Standard, the addition amount is 1-15w%.

The lubricating base oils include, but are not limited to, mineral oils, vegetable oils and ester oils.

The added amount of tetrabutyl titanate is 1-15w%, preferably 2-10w%, more preferably 3-7w%.

The invention provides a method for improving the oxidation stability of lubricating oil, which comprises: adding tetrabutyl titanate to a composition containing lubricating oil base oil, and the added amount is 1-15w% based on the weight of lubricating oil base oil .

The lubricating base oils include, but are not limited to, mineral oils, vegetable oils and ester oils.

The added amount of tetrabutyl titanate is 1-15w%, preferably 2-10w%, more preferably 3-7w%.

The lubricating oil composition may also contain other additives such as antiwear agents, antirust agents, and antioxidants.

The lubricating oil composition provided by the invention not only has the original lubricating performance, but also has significantly improved oxidation stability, and can be used under relatively severe working conditions such as high temperature and high pressure, so it has broad application environments and market prospects.

Detailed ways

In the following examples, the onset oxidation temperature was determined according to differential scanning calorimetry (DSC).

Example 1

Mix 150BS and 3w% tetrabutyl titanate into the flask, stir at 40° C. for 120 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 1.

Example 2

Mix 500 SN and 3w% tetrabutyl titanate into the flask, stir at 40° C. for 60 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 1.

Example 3

150ZN and 3w% tetrabutyl titanate were mixed and added into the flask, and stirred at 60° C. for 120 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 1.

Example 4

Mix 150DN and 5w% tetrabutyl titanate into the flask, stir at 40° C. for 120 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 1.

Table 1

Example 1 Example 2 Example 3 Example 4 base oil 150BS 500SN 150ZN 150DN DSC before modification, ℃ 200 206 190 181 DSC after modification, ℃ 292 278 255 243

Example 5

Dibutyl sebacate and 3w% tetrabutyl titanate were mixed and added into the flask, and stirred at 40° C. for 120 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 1.

Example 6

Trimethylolpropane and 3w% tetrabutyl titanate were mixed and added into the flask, and stirred at 40° C. for 60 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 1.

Example 7

Dibutyl sebacate and 6w% tetrabutyl titanate were mixed and added into the flask, and stirred at 40° C. for 120 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 1.

Table 2

Example 5 Example 6 Example 7 base oil Dioctyl sebacate Trimethylol propane ester Dibutyl sebacate DSC before modification, ℃ 178 210 178 DSC after modification, ℃ 206 246 213

Example 8

Mix castor oil and 3w% tetrabutyl titanate into the flask, and stir at 40°C for 120 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 3.

Example 9

Soybean oil and 3w% tetrabutyl titanate were mixed and added into the flask, and stirred at 40° C. for 120 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 3.

Example 10

Peanut oil and 3w% tetrabutyl titanate were mixed and added into the flask, and stirred at 60° C. for 60 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 3.

Example 11

Crude oil and 6w% tetrabutyl titanate were mixed and added into the flask, and stirred at 40° C. for 120 minutes to obtain the modified mineral oil. The initial oxidation temperature of DSC was determined, and the data are shown in Table 3.

table 3

Example 8 Example 9 Example 10 Example 11 base oil castor oil Soybean oil peanut oil Crude oil DSC before modification, ℃ 191 196 185 175 DSC after modification, ℃ 267 258 262 250

Claims (8)

1. The use of tetrabutyl titanate to improve the oxidation stability of lubricating oil, including: adding tetrabutyl titanate to the composition containing lubricating oil base oil, based on the weight of lubricating oil base oil, the addition amount is 1~ 15w%. 2. The use according to claim 1, wherein the lubricating oil base oil includes but not limited to mineral oil, vegetable oil and ester oil. 3. Use according to claim 2, wherein the mineral oil is selected from paraffinic crude oil base oil, intermediate crude oil base oil and/or naphthenic oil. 4. according to the described purposes of claim 3, it is characterized in that, mineral oil viscosity index range is-20～130. 5. The use according to claim 2, wherein the vegetable oil is refined oil, unrefined crude oil or waste oil, and the acid value range is between 0.05-10 mgKOH/g. 6. according to the described purposes of claim 2, it is characterized in that, wherein ester oil is selected from dioctyl sebacate, trimethylol propane ester, dioctyl adipate, dioctyl phthalate , one or more of dibutyl phthalate base oils. 7. The use according to claim 1, characterized in that the added amount of tetrabutyl titanate is 2-10w%. 8. The use according to claim 1, characterized in that the added amount of tetrabutyl titanate is 3-7w%.