阅读说明：本技术 一种低噪音复合磺酸钙基润滑脂组合物及制备方法 (Low-noise composite calcium sulfonate-based lubricating grease composition and preparation method thereof ) 是由 储友双 周钰 姜增鸿 于 2021-07-26 设计创作，主要内容包括：本发明提供一种低噪音复合磺酸钙基润滑脂组合物及制备方法。所述润滑脂组合物由包含以下质量百分含量的组分制成：高碱值合成烷基苯磺酸钙18-35％；转化剂1-5％；氢氧化钙0.1-3％；复合酸0.1-4％；深度精制矿物基础油30-60％；酯类油5-10％；烯烃合成油5-20％；所述高碱值合成烷基苯磺酸钙内的烷基苯磺酸钙由重量比1：(0.05-0.3)的长链线性烷基苯磺酸钙和十二烷基苯磺酸钙组成。本发明提供的复合磺酸钙基润滑脂在小型、中型轴承中具有良好的静音性能,同时具有极好的极压抗磨性和防锈性能,并具有长周期存储的结构稳定性。(The invention provides a low-noise composite calcium sulfonate-based lubricating grease composition and a preparation method thereof. The lubricating grease composition is prepared from the following components in percentage by mass: high-base number synthetic calcium alkyl benzene sulfonate 18-35%; 1-5% of transforming agent; 0.1 to 3 percent of calcium hydroxide; 0.1 to 4 percent of composite acid; 30-60% of deeply refined mineral base oil; 5-10% of ester oil; 5-20% of olefin synthetic oil; the calcium alkyl benzene sulfonate in the high-base number synthetic calcium alkyl benzene sulfonate comprises the following components in a weight ratio of 1: (0.05-0.3) long-chain linear calcium alkylbenzene sulfonate and calcium dodecylbenzene sulfonate. The composite calcium sulfonate-based lubricating grease provided by the invention has good silencing performance in small and medium-sized bearings, and simultaneously has excellent extreme pressure wear resistance and antirust performance, and has structural stability of long-period storage.)

1. The low-noise composite calcium sulfonate-based lubricating grease composition is characterized by being prepared from the following components in percentage by mass:

high-base number synthetic calcium alkyl benzene sulfonate 18-35%;

1-5% of transforming agent;

0.1 to 3 percent of calcium hydroxide;

0.1 to 4 percent of composite acid;

30-60% of deeply refined mineral base oil;

5-10% of ester oil;

5-20% of olefin synthetic oil;

the calcium alkyl benzene sulfonate in the high-base number synthetic calcium alkyl benzene sulfonate comprises the following components in a weight ratio of 1: (0.05-0.3) long-chain linear calcium alkylbenzene sulfonate and calcium dodecylbenzene sulfonate.

2. The low-noise complex calcium sulfonate-based grease composition as claimed in claim 1, wherein the total base number of the high-base number synthetic calcium alkylbenzene sulfonate is 360-425 mgKOH/g; the high-base number synthetic calcium alkyl benzene sulfonate needs to be diluted by base oil, and the base oil accounts for 40-60% of the total weight.

3. The low-noise complex calcium sulfonate-based grease composition according to claim 1 or 2, wherein the long-chain linear calcium alkylbenzene sulfonate is calcium benzenesulfonate having an alkyl side chain containing 20 to 24 carbon atoms.

4. The low-noise complex calcium sulfonate-based grease composition according to any one of claims 1 to 3, wherein the converting agent is a C4-C8 alcohol compound or a C2-C4 acid compound; the C4-C8 alcohol compound is preferably at least one of n-hexanol, n-pentanol, hexanediol, 1, 2-hexanediol, octanediol and 2, 3-butanediol; the C2-C4 acid compound is preferably at least one of acetic acid and propionic acid;

the composite acid is one or two selected from salicylic acid, sebacic acid, stearic acid and boric acid.

5. The low-noise complex calcium sulfonate-based grease composition as claimed in claim 1 or 4, wherein the deeply refined mineral base oil is a type of mineral base oil having a kinematic viscosity at 40 ℃ of 200-²/s。

6. The low noise complex calcium sulfonate grease composition according to claim 1 or 5, wherein the ester oil is selected from any one of trimellitate, pentaerythritol ester, and dioctyl sebacate.

7. The low-noise complex calcium sulfonate grease composition according to claim 1 or 6, wherein the olefin synthetic oil is polymerized from C8, C10 and C12 olefins and has a kinematic viscosity at 100 ℃ of 8 to 20mrn²/s。

8. The low noise calcium complex sulfonate grease composition according to claim 1 or 7, wherein the grease composition further comprises 0.2-2.0% by mass of an antioxidant, and the antioxidant is diphenylamine.

9. The method for preparing a low noise complex calcium sulfonate grease composition according to any one of claims 1 to 8, wherein the high base number synthetic calcium alkyl benzene sulfonate is subjected to crystal transformation by a transforming agent in a deep refined mineral base oil and is compounded, then under a high temperature condition, the olefin synthetic oil is added for quenching, finally the antioxidant and the ester oil are added and mixed uniformly.

10. The method for preparing a low-noise complex calcium sulfonate-based grease composition according to claim 9, comprising the steps of:

(1) adding high-base-number synthetic calcium alkyl benzene sulfonate, deep refined mineral base oil and water accounting for 10-20% of the total weight of the high-base-number synthetic calcium alkyl benzene sulfonate into a normal-pressure reaction kettle according to a specified weight ratio, mixing, stirring and heating to 85-95 ℃;

(2) adding a transforming agent, stirring, controlling the temperature to be 85-95 ℃ and transforming for 1-2 hours, so that the calcium carbonate is completely transformed into a calcite crystal form from an amorphous crystal form;

(3) controlling the temperature to 85-95 ℃, adding calcium hydroxide, stirring for 30-60 minutes, adding composite acid for saponification, diluting the calcium hydroxide by 1-3 times of water in advance, counting the weight of the water, controlling the temperature, and keeping for 30-60 minutes;

(4) heating to 150 ℃ and 160 ℃, controlling the heating time for 2-4 hours, keeping the temperature at the highest temperature for 10-15min, and adding olefin synthetic oil for quenching to facilitate the formation of a soap fiber structure;

(5) and (3) when the temperature is reduced to below 150 ℃, adding an antioxidant, finally adding ester oil, adjusting to the cone penetration of a specified mark by three-roll oil rolling, and filling to obtain a finished product.

Technical Field

The invention relates to the technical field of lubricating grease, and particularly relates to a low-noise composite calcium sulfonate-based lubricating grease composition and a preparation method thereof.

Background

With the rapid development of the manufacturing industry, the bearing industry has also made a great technical progress, the processing precision of the bearing is also gradually improved, the requirements on the noise, the service life and the like of the bearing are higher and higher, and the problems of the noise and the service life of the bearing cannot be completely solved by the optimized design of the bearing. The lubricating grease is used as the fifth major part of the bearing, and the development and preparation of the lubricating grease capable of reducing the running noise characteristic of the rolling bearing have important significance in meeting the requirements of the bearing industry. Silent bearing greases in the industry are still dominated by lithium-based low noise greases and polyurea-based low noise greases.

The grant publication No. CN102021069B provides a lithium-based low-noise bearing grease using naphthenic oil and ester oil as base oil, the grease has good performance of reducing vibration noise, the vibration value can be reduced by 2-5 decibels, and the indexes of high-temperature performance, low-temperature performance and the like of the grease reach better index ranges, and the finished grease product also has transparent appearance.

Grant publication No. CN100572510 provides a heat-resistant lithium grease composition which uses a polymerized lipid oil to prepare a higher fatty acid lithium soap bearing grease which is used for small motors, particularly motor bearings of household appliances such as air conditioners, motor bearings of image equipment such as blowers, and the like.

The grant publication No. CN107338095B provides a low-noise lubricating grease which is prepared by mixing lithium soap lubricating grease and polyurea lubricating grease, adding an auxiliary dispersant and an antioxidant, and then carrying out a high-temperature mixing process, and the low-noise lubricating grease has excellent low-noise performance, good mechanical stability and excellent lubricating life, and the maximum service temperature can reach 150 ℃.

In summary, the low noise bearing grease in the industry is mainly focused on lithium-based grease and polyurea-based grease, but as the requirements of the bearing industry on the mute bearing grease are higher and higher, for example, the mute bearing is involved in more and more sizes and the lubricating conditions are more and more demanding, the lithium-based low noise grease and the polyurea-based low noise grease are gradually unable to meet the requirements at the same time.

Compared with other thickeners, the composite calcium sulfonate thickener has various performances of excellent mechanical stability, colloid stability, extreme pressure abrasion resistance, water resistance, rust resistance and the like, is called one of the most potential greases in the twenty-first century, represents the development direction of the grease, and is a typical representative of intensive technology in the grease industry. The product is widely applied to high-temperature, high-humidity and high-load equipment such as rolling mill bearings, continuous casting machine roller bearings and the like in the steel industry. At present, the research on the low-noise performance of the composite calcium sulfonate thickener is less, and the invention is specially provided in order to meet the higher requirements of the bearing industry on lubricating grease.

Disclosure of Invention

The invention aims to provide a low-noise composite calcium sulfonate-based lubricating grease composition and a preparation method thereof. The composite calcium sulfonate-based lubricating grease provided by the invention has good silencing performance in small and medium-sized bearings, and also has excellent extreme pressure wear resistance, long-period storage stability and antirust performance.

The invention provides the following technical scheme:

a low-noise composite calcium sulfonate-based lubricating grease composition is prepared from the following components in percentage by mass:

high-base number synthetic calcium alkyl benzene sulfonate 18-35%;

1-5% of transforming agent;

0.1 to 3 percent of calcium hydroxide;

0.1 to 4 percent of composite acid;

30-60% of deeply refined mineral base oil;

5-10% of ester oil;

5-20% of olefin synthetic oil;

the calcium alkyl benzene sulfonate in the high-base number synthetic calcium alkyl benzene sulfonate comprises the following components in a weight ratio of 1: (0.05-0.3) long-chain linear calcium alkylbenzene sulfonate and calcium dodecylbenzene sulfonate.

According to the invention, a large number of experiments show that the silence performance of the obtained lubricating grease product is obviously improved by taking the long-chain linear calcium alkylbenzene sulfonate and the calcium dodecylbenzene sulfonate which are in a specific ratio as raw materials, and the lubricating grease product also has excellent extreme pressure wear resistance, long-period storage stability and antirust performance.

According to some preferred embodiments of the present invention, the total base number of the overbased synthetic calcium alkylbenzene sulfonate is 360-425 mgKOH/g.

The high-alkali-value synthetic calcium alkyl benzene sulfonate needs to be diluted by base oil, and the base oil accounts for 40-60% of the total weight.

According to some preferred embodiments of the present invention, the long-chain linear calcium alkylbenzene sulfonate is calcium benzene sulfonate with an alkyl side chain having carbon atoms in the range of 20 to 24.

According to some preferred embodiments of the present invention, the converting agent is a C4-C8 alcohol compound or a C2-C4 acid compound; the C4-C8 alcohol compound is preferably at least one of n-hexanol, n-pentanol, hexanediol, 1, 2-hexanediol, octanediol and 2, 3-butanediol; the C2-C4 acid compound is preferably at least one of acetic acid and propionic acid;

the composite acid is one or two selected from salicylic acid, sebacic acid, stearic acid and boric acid.

According to some preferred embodiments of the present invention, the deeply refined mineral base oil employed in the present invention is a mineral base oil having a kinematic viscosity at 40 ℃ of 200-²/s。

According to some preferred embodiments of the present invention, the ester oil used in the present invention is selected from any one of trimellitate, pentaerythritol ester, and dioctyl sebacate.

According to some preferred embodiments of the present invention, the olefin synthetic oil used in the present invention is polymerized from C8, C10 and C12 olefins, and has a kinematic viscosity of 8-20mrn at 100 ℃²/s。

According to some preferred embodiments of the present invention, the grease composition further comprises 0.2-2.0% by mass of an antioxidant, and the antioxidant is diphenylamine. The invention discovers that the antioxidant with the content is added, so that the antioxidant performance of the lubricating grease product is obviously improved on the basis of ensuring the original performance of the lubricating grease product.

The invention also provides a preparation method of the low-noise composite calcium sulfonate-based lubricating grease composition, which comprises the steps of completing crystal conversion by a conversion agent in the highly refined mineral base oil, compounding, adding olefin synthetic oil for quenching at high temperature, finally adding the antioxidant and the ester oil, and uniformly mixing.

Specifically, the method comprises the following steps:

(1) adding high-base-number synthetic calcium alkyl benzene sulfonate, deep refined mineral base oil and water accounting for 10-20% of the total weight of the high-base-number synthetic calcium alkyl benzene sulfonate into a normal-pressure reaction kettle according to a specified weight ratio, mixing, wherein the weight of the water is not counted into the total weight, and stirring and heating to 85-95 ℃;

(2) adding a transforming agent, stirring, controlling the temperature to be 85-95 ℃ and transforming for 1-2 hours, so that the calcium carbonate is completely transformed into a calcite crystal form from an amorphous crystal form;

(3) controlling the temperature to 85-95 ℃, adding calcium hydroxide, stirring for 30-60 minutes, adding composite acid, diluting the calcium hydroxide with 1-3 times of water in advance, counting the weight of the water, controlling the temperature, and keeping for 30-60 minutes;

(4) heating to 150 ℃ and 160 ℃, controlling the heating time for 2-4 hours, keeping the temperature at the highest temperature for 10-15min, and adding olefin synthetic oil for quenching to facilitate the formation of a soap fiber structure;

(5) and (3) when the temperature is reduced to below 150 ℃, adding an antioxidant, finally adding ester oil, adjusting to the cone penetration of a specified mark by three-roll oil rolling, and filling to obtain a finished product.

The composite calcium sulfonate-based lubricating grease composition provided by the invention has the following advantages:

1) the composite calcium sulfonate-based lubricating grease composition greatly reduces the content of high-base-number synthetic calcium alkyl benzene sulfonate in the lubricating grease, and meanwhile, the high-base-number synthetic calcium alkyl benzene sulfonate fiber is finer, and the size of calcium carbonate crystals in the high-base-number synthetic calcium alkyl benzene sulfonate is more uniform, so that the silencing performance is greatly improved.

2) The composite calcium sulfonate-based lubricating grease composition optimizes the base oil formula combination, brings good low-speed oil separation characteristic of the lubricating grease, and greatly reduces the phenomenon of excessive starting noise.

3) The composite calcium sulfonate-based lubricating grease composition effectively improves the stability of colloid after long-term placement, and does not generate the phenomenon of large oil distribution of lubricating grease.

4) The composite calcium sulfonate-based lubricating grease composition has good extreme pressure anti-wear performance, can effectively reduce the running resistance of equipment, reduces the abrasion of mechanical equipment during running, and has excellent performance in a mute test under the condition that a medium-sized bearing is added with a certain load.

5) The composite calcium sulfonate-based lubricating grease composition has excellent antirust performance and can protect lubricating equipment for a long time.

Detailed Description

The present invention is further illustrated by the following examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials added in the examples are commercially conventional raw materials unless otherwise specified.

In the following examples and comparative examples, 150BS was used as the deeply refined mineral base oil; PAO8 for olefin synthetic oil separation; ester oil is trimellitate; diphenylamine is used as the antioxidant.

Example 1

The low-noise complex calcium sulfonate-based lubricating grease composition provided by the embodiment is prepared from the following components in percentage by mass:

18 percent of high-base-number synthetic calcium alkyl benzene sulfonate (the base oil accounts for 50 percent of the high-base-number calcium alkyl benzene sulfonate, and the calcium alkyl benzene sulfonate consists of calcium benzene sulfonate and calcium dodecyl benzene sulfonate with the alkyl side chain carbon atom number of 20-24 in the weight ratio of 1: 0.3);

1% of n-amyl alcohol;

0.1 percent of calcium hydroxide;

0.9 percent of salicylic acid;

60% of deeply refined mineral base oil;

10% of ester oil;

8% of olefin synthetic oil;

2 percent of antioxidant.

The preparation method of the lubricating grease composition comprises the following steps:

(1) adding high-base-number synthetic calcium alkyl benzene sulfonate with a total base number of 420mgKOH/g, 150BS and water accounting for 10 percent of the total weight of the high-base-number synthetic calcium alkyl benzene sulfonate into a laboratory pilot-scale atmospheric kettle, mixing, stirring and heating to 90 ℃.

(2) Adding n-amyl alcohol into the reaction kettle, stirring, controlling the temperature to be constant temperature of 85 ℃, converting for 1 hour, and after the constant temperature is finished, taking a sample and carrying out an infrared spectrometer test to achieve the infrared detection qualification; namely 862-865cm of amorphous calcium carbonate characteristic absorption peak in infrared spectrum detection in a sample^-1The peak position disappeared at 881cm^-1And if a strong sharp absorption peak appears at the peak position, the calcium carbonate is completely converted into a calcite crystal form from an amorphous crystal form, and the infrared detection is qualified.

(3) And controlling the temperature to 90 ℃ after the product is qualified, adding calcium hydroxide, stirring for 30 minutes, adding salicylic acid for saponification, diluting the calcium hydroxide by 3 times of water in advance, counting the weight of the water from the total weight, and controlling the temperature and saponifying for 60 minutes.

(4) Heating to 150 ℃, controlling the heating time for 4 hours, keeping the temperature at the highest temperature for 10 minutes, and adding PAO8 for quenching to facilitate the formation of a soap fiber structure.

(5) When the temperature is reduced to 120 ℃, diphenylamine is added, trimellitate is finally added, and the mixture is adjusted to the cone penetration of a specified mark by three-roll mill rolling oil and then filled into a finished product.

Example 2

The low-noise complex calcium sulfonate-based lubricating grease composition provided by the embodiment is prepared from the following components in percentage by mass:

35% of high-base-number synthetic calcium alkylbenzene sulfonate (the base oil accounts for 50% of the high-base-number calcium alkylbenzene sulfonate comprises calcium benzenesulfonate and calcium dodecylbenzenesulfonate, wherein the weight ratio of the calcium alkylbenzene sulfonate to the calcium dodecylbenzenesulfonate is 1: 0.05, and the carbon atom number of an alkyl side chain is 20-24);

1% of octanediol;

0.2 percent of calcium hydroxide;

1.8 percent of salicylic acid;

41.5% of deeply refined mineral base oil;

5% of ester oil;

15% of olefin synthetic oil;

0.5 percent of antioxidant.

The preparation method of the lubricating oil composition comprises the following steps:

(1) adding high-base-number synthetic calcium alkyl benzene sulfonate with a total base number of 420mgKOH/g, 150BS and water accounting for 12 percent of the total weight of the high-base-number synthetic calcium alkyl benzene sulfonate into a laboratory pilot-scale atmospheric kettle, mixing, stirring and heating to 85 ℃.

(2) Adding octanediol into the reaction kettle, stirring, controlling the temperature at 90 ℃ for constant temperature conversion for 2 hours, and after the constant temperature is finished, taking a sample and carrying out infrared spectrometer test to achieve qualified infrared detection; namely 862-865cm of amorphous calcium carbonate characteristic absorption peak in infrared spectrum detection in a sample^-1The peak position disappeared at 882cm^-1And if a strong sharp absorption peak appears at the peak position, the calcium carbonate is completely converted into a calcite crystal form from an amorphous crystal form, and the infrared detection is qualified.

(3) And controlling the temperature to 85-95 ℃ after the product is qualified, adding calcium hydroxide, stirring for 30 minutes, adding salicylic acid for saponification, diluting the calcium hydroxide by 3 times of water in advance, counting the weight of the water by the total weight, and controlling the temperature and saponifying for 60 minutes.

(4) Heating to 160 ℃, controlling the heating time for 4 hours, keeping the temperature at the highest temperature for 10 minutes, and adding PAO8 for quenching to facilitate the formation of a soap fiber structure.

(5) When the temperature is reduced to 120 ℃, diphenylamine is added, trimellitate is finally added, and the mixture is adjusted to the cone penetration of a specified mark by three-roll mill rolling oil and then filled into a finished product.

Example 3

The low-noise complex calcium sulfonate-based lubricating grease composition provided by the embodiment is prepared from the following components in percentage by mass:

35% of high-base-number synthetic calcium alkylbenzene sulfonate (the base oil accounts for 50% of the high-base-number calcium alkylbenzene sulfonate comprises calcium benzenesulfonate and calcium dodecylbenzenesulfonate, wherein the weight ratio of the calcium alkylbenzene sulfonate to the calcium dodecylbenzenesulfonate is 1: 0.3, and the carbon atom number of an alkyl side chain is 20-24);

1% of octanediol;

0.8 percent of calcium hydroxide;

1.2% of boric acid;

30% of deeply refined mineral base oil;

10% of ester oil;

20% of olefin synthetic oil;

2 percent of antioxidant.

The preparation method of the lubricating oil composition comprises the following steps:

(1) adding high-base-number synthetic calcium alkyl benzene sulfonate with a total base number of 420mgKOH/g, 150BS and water accounting for 12 percent of the total weight of the high-base-number synthetic calcium alkyl benzene sulfonate into a laboratory pilot-scale atmospheric kettle, mixing, stirring and heating to 95 ℃.

(2) Adding octanediol into the reaction kettle, stirring, controlling the temperature at 95 ℃ for constant temperature conversion for 2 hours, and after the constant temperature is finished, taking a sample and carrying out infrared spectrometer test to achieve qualified infrared detection; namely 862-865cm of amorphous calcium carbonate characteristic absorption peak in infrared spectrum detection in a sample^-1The peak position disappeared at 882cm^-1And if a strong sharp absorption peak appears at the peak position, the calcium carbonate is completely converted into a calcite crystal form from an amorphous crystal form, and the infrared detection is qualified.

(3) And controlling the temperature to 85 ℃ after the product is qualified by an infrared spectrogram, adding calcium hydroxide, stirring for 60 minutes, adding boric acid for saponification, diluting the calcium hydroxide by 1-3 times of water in advance, counting the weight of the water, and controlling the temperature and saponifying for 30-60 minutes.

(4) And (3) heating to 155 ℃, controlling the heating time for 3 hours, keeping the temperature at the highest temperature for 15 minutes, and adding PAO8 for quenching to facilitate the formation of a soap fiber structure.

(5) When the temperature is reduced to 120 ℃, diphenylamine is added, trimellitate is finally added, and the mixture is adjusted to the cone penetration of a specified mark by three-roll mill rolling oil and then filled into a finished product.

Example 4

The low-noise complex calcium sulfonate-based lubricating grease composition provided by the embodiment is prepared from the following components in percentage by mass:

20% of high-base-number synthetic calcium alkylbenzene sulfonate (the base oil accounts for 50% of the high-base-number calcium alkylbenzene sulfonate, and the calcium alkylbenzene sulfonate consists of 20-24 carbon atoms of alkyl side chains and calcium dodecylbenzene sulfonate in a weight ratio of 1: 0.10);

5% of octanediol;

0.1 percent of calcium hydroxide;

2.9 percent of boric acid;

55% of deeply refined mineral base oil;

10% of ester oil;

5% of olefin synthetic oil;

2 percent of antioxidant.

The preparation method of the lubricating oil composition comprises the following steps:

(1) adding the high-base-number synthetic calcium alkyl benzene sulfonate with the total base number of 400mgKOH/g, 150BS and water accounting for 20 percent of the total weight of the high-base-number synthetic calcium alkyl benzene sulfonate into a laboratory pilot-scale atmospheric kettle, mixing, stirring and heating to 90 ℃.

(2) Adding octanediol into the reaction kettle, stirring, controlling the temperature to be constant at 85 ℃ for 2 hours of conversion, and after the constant temperature is finished, taking a sample to perform infrared spectrometer test to reach the infrared detection qualification; namely 862-865cm of amorphous calcium carbonate characteristic absorption peak in infrared spectrum detection in a sample^-1The peak position disappeared at 883cm^-1And if a strong sharp absorption peak appears at the peak position, the calcium carbonate is completely converted into a calcite crystal form from an amorphous crystal form, and the infrared detection is qualified.

(3) And controlling the temperature to 95 ℃ after the product is qualified by an infrared spectrogram, adding calcium hydroxide, stirring for 60 minutes, adding boric acid for saponification, diluting the calcium hydroxide by 3 times of water in advance, counting the weight of the water from the total weight, and controlling the temperature and saponifying for 30 minutes.

(4) The temperature is increased to 152 ℃, the temperature rising time is controlled to be 4 hours, the temperature is kept at the highest temperature for 15 minutes, and PAO8 is added for quenching to facilitate the formation of a soap fiber structure.

(5) When the temperature is reduced to 120 ℃, diphenylamine is added, trimellitate is finally added, and the mixture is adjusted to the cone penetration of a specified mark by three-roll mill rolling oil and then filled into a finished product.

Example 5

The low-noise complex calcium sulfonate-based lubricating grease composition provided by the embodiment is prepared from the following components in percentage by mass:

24% of high-base-number synthetic calcium alkylbenzene sulfonate (the base oil accounts for 50% of the high-base-number calcium alkylbenzene sulfonate, and the calcium alkylbenzene sulfonate consists of calcium benzenesulfonate and calcium dodecylbenzenesulfonate with 20-24 carbon atoms in alkyl side chains in a weight ratio of 1: 0.1);

2% of octanediol;

3% of calcium hydroxide;

4% of boric acid;

48% of deeply refined mineral base oil;

8% of ester oil;

10% of olefin synthetic oil;

1 percent of antioxidant.

The preparation method of the lubricating oil composition comprises the following steps:

(1) adding high-base-number synthetic calcium alkyl benzene sulfonate with a total base number of 400mgKOH/g, 150BS and water accounting for 15 percent of the total weight of the high-base-number synthetic calcium alkyl benzene sulfonate into a laboratory pilot-scale atmospheric kettle, mixing, stirring and heating to 90 ℃.

(2) Adding octanediol into the reaction kettle, stirring, controlling the temperature at 90 ℃ for constant temperature conversion for 1 hour, and after the constant temperature is finished, taking a sample and carrying out infrared spectrometer test to achieve qualified infrared detection; namely 862-865cm of amorphous calcium carbonate characteristic absorption peak in infrared spectrum detection in a sample^-1The peak position disappeared at 8801m^-1And if a strong sharp absorption peak appears at the peak position, the calcium carbonate is completely converted into a calcite crystal form from an amorphous crystal form, and the infrared detection is qualified.

(3) And controlling the temperature to 85-95 ℃ after the product is qualified, adding calcium hydroxide, stirring for 30 minutes, adding boric acid for saponification, diluting the calcium hydroxide by 1 time of water in advance, counting the weight of the water, and controlling the temperature and saponifying for 60 minutes.

(4) The temperature is increased to 152 ℃, the temperature rising time is controlled to be 4 hours, the temperature is kept at the highest temperature for 15 minutes, and PAO8 is added for quenching to facilitate the formation of a soap fiber structure.

(5) When the temperature is reduced to 120 ℃, diphenylamine is added, trimellitate is finally added, and the mixture is adjusted to the cone penetration of a specified mark by three-roll mill rolling oil and then filled into a finished product.

Example 6

The low-noise complex calcium sulfonate-based lubricating grease composition provided by the embodiment is prepared from the following components in percentage by mass:

28% of high-base-number synthetic calcium alkylbenzene sulfonate (the base oil accounts for 50% of the high-base-number calcium alkylbenzene sulfonate comprises calcium benzenesulfonate and calcium dodecylbenzenesulfonate, wherein the carbon atoms of alkyl side chains of the calcium alkylbenzene sulfonate are 20-24 in a weight ratio of 1: 0.15);

1.5% of octanediol;

0.1 percent of calcium hydroxide

0.1% of boric acid;

42.3 percent of deeply refined mineral base oil;

7% of ester oil;

20% of olefin synthetic oil;

1 percent of antioxidant.

The preparation method of the lubricating oil composition comprises the following steps:

(1) adding high-base-number synthetic calcium alkyl benzene sulfonate with a total base number of 400mgKOH/g, 150BS and water accounting for 15 percent of the total weight of the high-base-number synthetic calcium alkyl benzene sulfonate into a laboratory pilot-scale atmospheric kettle, mixing, stirring and heating to 85-95 ℃.

(2) Adding octanediol into the reaction kettle, stirring, controlling the temperature to be 85-95 ℃ for constant-temperature conversion for 2 hours, and after the constant temperature is finished, taking a sample and carrying out infrared spectrometer test to achieve qualified infrared detection; namely 862-865cm of amorphous calcium carbonate characteristic absorption peak in infrared spectrum detection in a sample^-1The peak position disappeared at 884cm^-1And if a strong sharp absorption peak appears at the peak position, the calcium carbonate is completely converted into a calcite crystal form from an amorphous crystal form, and the infrared detection is qualified.

(3) And controlling the temperature to 85 ℃ after the product is qualified by an infrared spectrogram, adding calcium hydroxide, stirring for 30 minutes, adding boric acid for saponification, diluting the calcium hydroxide by 3 times of water in advance, counting the weight of the water from the total weight, and controlling the temperature and saponifying for 60 minutes.

(4) And (3) heating to 152 ℃, controlling the heating time for 4 hours, keeping the temperature at the highest temperature for 10-15min, and adding PAO8 for quenching to facilitate the formation of a soap fiber structure.

(5) When the temperature is reduced to 120 ℃, diphenylamine is added, trimellitate is finally added, and the mixture is adjusted to the cone penetration of a specified mark by three-roll mill rolling oil and then filled into a finished product.

Comparative example 1

The grease composition of this comparative example differs from example 1 in that the calcium dodecylbenzenesulfonate is replaced with an equal amount of high boiling alkylbenzene sulfonic acid.

Comparative example 2

The grease composition of this comparative example differs from example 1 in that the calcium dodecylbenzenesulfonate is replaced with an equal amount of long-chain linear calcium alkylbenzene sulfonate.

Comparative example 3

Is a commercial lithium-based low-noise bearing grease.

Comparative example 4

Is a commercial low noise polyurea grease.

The performance data for examples 1-6 and comparative examples 1-4 are shown in tables 1 and 2.

TABLE 1

TABLE 2

Remarking: the samples of 1,3,6 and 12 months of testing in the examples and the comparative examples are stored in a sample library according to the GB/T269 storage requirement and tested according to the GB/T requirement.

From the above data the following conclusions can be drawn:

1) the composite calcium sulfonate-based lubricating grease prepared by the method reduces the content of high-base-number synthetic calcium alkylbenzene sulfonate in the lubricating grease, meanwhile, the high-base-number synthetic calcium alkylbenzene sulfonate fibers are finer, and the size of calcium carbonate in the high-base-number synthetic calcium alkylbenzene sulfonate is more uniform.

2) The test data of the composite calcium sulfonate-based lubricating grease prepared by the method in the BVT-8 bearing axial load-loaded vibration test is good, which shows that the product has excellent silencing performance in loaded 2216 bearing.

3) After the composite calcium sulfonate-based lubricating grease prepared by the method is stored for one year, the oil separation amount of a sample steel mesh is stable, the phenomenon of large amount of oil separation of the lubricating grease is not generated, and the composite calcium sulfonate-based lubricating grease is superior to the comparative lithium-based and polyurea-based low-noise lubricating grease, so that the product disclosed by the invention has good colloid stability after long-term storage.

4) The composite calcium sulfonate-based lubricating grease prepared by the method has good extreme pressure anti-wear performance, can effectively reduce the running resistance of equipment, reduces the abrasion of mechanical equipment during running, and has excellent performance in a mute test under the condition that a medium-sized bearing is added with a certain load.

5) The composite calcium sulfonate grease prepared by the method of the invention passes the corrosion resistance test under the condition of 5% saline water, and is superior to comparative examples 3 and 4, which shows that the composite calcium sulfonate grease has excellent antirust performance and can play a long-acting protection role on lubricating equipment.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.