A low-noise grease with good shear resistance and preparation method thereof

Abstract

The present application relates to the technical field of lubricating grease, and specifically discloses a low-noise lubricating grease with good anti-shear performance and a preparation method thereof. The technical key points are: a low-noise lubricating grease with good anti-shear performance, comprising the following components in parts by weight: 60-80 parts of base oil, 20-35 parts of thickener, 5-10 parts of pentaerythritol tetraisostearate, 0.5-2 parts of antioxidant, 1-3 parts of anti-wear extreme pressure agent, 0.1-0.5 parts of metal passivator, 1-10 parts of viscosity enhancer, and 0.5-1 parts of rust inhibitor; the base oil is polyalphaolefin, and the viscosity at 40°C is 20-200mm 2 / s; the thickener is amino aromatic amine, hydroxy fatty amine and diisocyanate. The grease provided by the present application has excellent shear resistance and low noise performance.

Description

Technical Field

[0001] The present application relates to the technical field of lubricating grease, and more specifically, to a low-noise lubricating grease with good anti-shearing performance and a preparation method thereof. Background Art

[0002] In recent years, with the increasing application of precision rolling bearings, bearing vibration and noise have attracted more and more attention, especially in the concentrated bearings and micro bearings of some new military equipment and civilian precision machinery, such as disk storage drives, linear or rotary read-write heads and printer drives in the computer industry, audio-visual equipment, textile machinery, precision instruments, small motors, air conditioners, washing machines, military electronics, precision instruments, etc., bearing greases require the use of low-noise greases, which puts very high demands on bearing noise. At the same time, with the rapid development of bearing materials and production and processing technologies, the noise generated by the bearing itself has been greatly reduced, making lubricants the main factor affecting bearing noise.

[0003] Polyurea refers to a compound containing NHCONH groups in its molecular structure, which can be used as a thickener for grease. Commonly used ones are diurea and tetraurea. Polyurea compounds are a type of thickener with good thermal stability. Its molecular structure does not contain metal atoms, and it has no catalytic and aging effect on the base oil during use. Therefore, polyurea grease has good high temperature resistance, extremely long bearing life, and good water resistance. However, before the 1990s, the grease industry believed that urea-based grease could not be used as a low-noise grease because urea-based grease would produce harsh noise during bearing operation.

[0004] Polyurea grease does not contain metal ions, thus avoiding the catalytic oxidation of metal ions on the grease, making its service life much longer than that of metal soap-based grease. However, it also has its own defects. For example, after working at high temperatures for a long time, polyurea grease will harden, which often causes pipeline blockage in some high-temperature mechanical equipment that requires centralized grease supply, thus affecting the normal use of the machinery. Poor shear resistance, obvious thinning after shearing, easy to cause grease loss, weak thickening ability, etc., all of which also limit the use of polyurea grease. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a low-noise grease with good anti-shear performance and a preparation method thereof. The grease provided by the present application has excellent anti-shear performance and low-noise performance.

[0006] In the first aspect, the present application provides a low-noise grease with good shear resistance, which adopts the following technical solution:

[0007] A low-noise lubricating grease with good shear resistance, comprising the following components in parts by weight:

[0008] 60-80 parts of base oil, 20-35 parts of thickener, 5-10 parts of pentaerythritol tetraisostearate, 0.5-2 parts of antioxidant, 1-3 parts of anti-wear extreme pressure agent, 0.1-0.5 parts of metal passivator, 1-10 parts of tackifier, 0.5-1 parts of rust inhibitor;

[0009] The thickener is amino aromatic amine, hydroxy fatty amine and diisocyanate.

[0010] Preferably, the weight ratio of amino aromatic amine to hydroxy fatty amine is 1:(0.5-1).

[0011] The base oil is one or more of synthetic ester base oil, mineral oil, polyalphaolefin, alkyl naphthalene, and polyether oil.

[0012] Preferably, the base oil is polyalphaolefin with a viscosity of 20-200 mm at 40°C. 2 / s;

[0013] The performance of polyurea greases prepared by using different types of organic amines varies greatly, and the reason for this difference is related to the difference in the fiber structure of the urea thickener. Generally, the dropping point of greases prepared by using a single fatty amine is unstable, while the greases prepared by using a single aromatic amine are rough in appearance and the amount of thickener used is also high. This application uses a compound of the two as raw materials to prepare a grease with stable performance and strong thickening ability. Compared with other greases, it has a high dropping point, high consistency and good antioxidant properties. In this application, aromatic amines use aromatic amines with amino groups to further improve the low-noise performance of the grease, and fatty amines use fatty amines with hydroxyl groups. The hydroxyl group can enhance the intermolecular force of the grease, making the molecular structure tighter, thereby improving the shear resistance of the grease.

[0014] The present application can further improve the vibration reduction performance of the grease during operation by adding pentaerythritol tetraisostearate, so as to improve the low noise performance of the grease.

[0015] Preferably, the diisocyanate is toluene diisocyanate and / or 4,4'-diphenylmethane diisocyanate.

[0016] Diisocyanates of different structures have little effect on the dropping point and steel mesh oil separation of the prepared polyurea grease. Taking into account the cost and performance of the finished grease, this application uses a mixture of toluene diisocyanate and 4,4'-diphenylmethane diisocyanate.

[0017] Preferably, the antioxidant is one or more of 2,6-di-tert-butyl-4-methylphenol, alkyl diphenylamine, and 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane.

[0018] Preferably, the extrusion anti-wear agent is one or more of nano molybdenum dioxide, nano tungsten dioxide and sulfided isobutylene.

[0019] Preferably, the tackifier is one or more of polyisobutylene, methacrylate and ethylene-propylene rubber.

[0020] Preferably, the rust inhibitor is one or more of sulfonates, naphthalenesulfonates and phosphates.

[0021] In a second aspect, the present application provides a method for preparing a low-noise grease with good shear resistance, using the following technical solution:

[0022] A low-noise grease with good shear resistance comprises the following preparation steps:

[0023] S1, dissolving amino aromatic amine and diisocyanate in a portion of base oil, performing a first reaction, and obtaining a mixture A;

[0024] S2, adding hydroxy fatty amine to mixture A, performing a second reaction, and obtaining mixture B;

[0025] S3, adding the remaining base oil to the mixture B, and then adding pentaerythritol tetraisostearate, antioxidant, anti-wear extreme pressure agent, metal passivator, viscosity enhancer, rust inhibitor, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0026] In summary, this application has the following beneficial effects:

[0027] This application uses a compound of the two as raw materials to prepare a grease with stable performance and strong thickening ability. Compared with other greases, it has a high dropping point, high consistency and good oxidation resistance. In this application, the aromatic amine uses an aromatic amine with an amino group, which can further improve the low noise performance of the grease, and the fatty amine uses a fatty amine with a hydroxyl group. The hydroxyl group can enhance the intermolecular force of the grease, making the molecular structure more compact, thereby improving the shear resistance of the grease. DETAILED DESCRIPTION

[0028] The present application is further described in detail below with reference to the embodiments.

[0029] In each embodiment and comparative example of the present application, the base oil used is poly-alpha olefin, and the viscosity at 40°C is 60 mm 2 / s; diisocyanate is a mixture of toluene diisocyanate and / or 4,4'-diphenylmethane diisocyanate in a ratio of 1:1, all of which were purchased from Shanghai Jiubang Chemical Co., Ltd.; aminoaromatic amine is 2-aminobenzamide, and hydroxy fatty amines are hydroxyacetamide and ethanolamine; antioxidant is 2,6-di-tert-butyl-4-methylphenol, and anti-wear extreme pressure agent is nano molybdenum dioxide with a particle size of 10-20nm; metal passivator is zinc dialkyl dithiophosphate, purchased from Jinzhou Jiaduorun Material Technology Co., Ltd.; viscosity enhancer is polyisobutylene, purchased from Shandong Hongrui New Material Technology Co., Ltd.; rust inhibitor is sodium petroleum sulfonate, purchased from Jinan Junteng Chemical Co., Ltd., model T702.

[0030] Example

[0031] Example 1

[0032] A low-noise grease with good shear resistance is prepared by the following steps:

[0033] S1, adding 10 kg of 2-aminobenzamide, 10 kg of diisocyanate and 40 kg of base oil into a reactor, reacting at 80° C. for 1 h to obtain a mixture A;

[0034] S2, adding 10 kg of hydroxyacetamide into a reaction kettle, mixing with mixture A, reacting at 80° C. for 1 h, to obtain mixture B;

[0035] S3, cooling below 50°C, adding 30kg of base oil into the reactor, mixing with mixture B, and then adding 7.5kg of pentaerythritol tetraisostearate, 1.2kg of 2,6-di-tert-butyl-4-methylphenol, 2kg of nano molybdenum dioxide, 0.3kg of zinc dialkyl dithiophosphate, 5.5kg of polyisobutylene, and 0.75kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0036] Example 2

[0037] A low-noise grease with good shear resistance is prepared by the following steps:

[0038] S1, adding 7 kg of 2-aminobenzamide, 7 kg of diisocyanate and 35 kg of base oil into a reactor, reacting at 80° C. for 1 h to obtain a mixture A;

[0039] S2, adding 7 kg of ethanolamine into the reactor, mixing with the mixture A, reacting at 80° C. for 1 h, to obtain a mixture B;

[0040] S3, cooling below 50°C, adding 25kg of base oil into the reactor, mixing with mixture B, and then adding 5kg of pentaerythritol tetraisostearate, 0.5kg of 2,6-di-tert-butyl-4-methylphenol, 1kg of nano molybdenum dioxide, 0.1kg of zinc dialkyl dithiophosphate, 1kg of polyisobutylene, and 0.5kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0041] Example 3

[0042] A low-noise grease with good shear resistance is prepared by the following steps:

[0043] S1, adding 26 kg of 2-aminobenzamide, 26 kg of diisocyanate and 50 kg of base oil into a reactor, reacting at 80° C. for 1 h to obtain a mixture A;

[0044] S2, adding 28 kg of hydroxyacetamide into a reaction kettle, mixing with mixture A, reacting at 80° C. for 1 h, to obtain mixture B;

[0045] S3, cooling below 50°C, adding 30kg of base oil into the reactor, mixing with mixture B, and then adding 10kg of pentaerythritol tetraisostearate, 2kg of 2,6-di-tert-butyl-4-methylphenol, 3kg of nano molybdenum dioxide, 0.5kg of zinc dialkyl dithiophosphate, 10kg of polyisobutylene, and 1kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0046] Example 4

[0047] A low-noise grease with good shear resistance is prepared by the following steps:

[0048] S1, adding 8 kg of 2-aminobenzamide, 10 kg of diisocyanate and 40 kg of base oil into a reactor, reacting at 80° C. for 1 h to obtain a mixture A;

[0049] S2, adding 12 kg of hydroxyacetamide into a reaction kettle, mixing with mixture A, reacting at 80° C. for 1 h, to obtain mixture B;

[0050] S3, cooling below 50°C, adding 30kg of base oil into the reactor, mixing with mixture B, and then adding 7.5kg of pentaerythritol tetraisostearate, 1.2kg of 2,6-di-tert-butyl-4-methylphenol, 2kg of nano molybdenum dioxide, 0.3kg of zinc dialkyl dithiophosphate, 5.5kg of polyisobutylene, and 0.75kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0051] Example 5

[0052] A low-noise grease with good shear resistance is prepared by the following steps:

[0053] S1, adding 11.4 kg 2-aminobenzamide, 10 kg diisocyanate and 40 kg base oil into a reactor, reacting at 80° C. for 1 h to obtain a mixture A;

[0054] S2, adding 8.6 kg of hydroxyacetamide into a reaction kettle, mixing with mixture A, reacting at 80° C. for 1 h, to obtain mixture B;

[0055] S3, cooling below 50°C, adding 30kg of base oil into the reactor, mixing with mixture B, and then adding 7.5kg of pentaerythritol tetraisostearate, 1.2kg of 2,6-di-tert-butyl-4-methylphenol, 2kg of nano molybdenum dioxide, 0.3kg of zinc dialkyl dithiophosphate, 5.5kg of polyisobutylene, and 0.75kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0056] Example 6

[0057] A low-noise grease with good shear resistance is prepared by the following steps:

[0058] S1, adding 13.3 kg of 2-aminobenzamide, 10 kg of diisocyanate and 40 kg of base oil into a reactor, reacting at 80° C. for 1 h to obtain a mixture A;

[0059] S2, adding 6.7 kg of hydroxyacetamide into a reaction kettle, mixing with mixture A, reacting at 80° C. for 1 h, to obtain mixture B;

[0060] S3, cooling below 50°C, adding 30kg of base oil into the reactor, mixing with mixture B, and then adding 7.5kg of pentaerythritol tetraisostearate, 1.2kg of 2,6-di-tert-butyl-4-methylphenol, 2kg of nano molybdenum dioxide, 0.3kg of zinc dialkyl dithiophosphate, 5.5kg of polyisobutylene, and 0.75kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0061] Example 7

[0062] A low-noise grease with good shear resistance is prepared by the following steps:

[0063] S1, adding 14.3 kg of 2-aminobenzamide, 10 kg of diisocyanate and 40 kg of base oil into a reactor, reacting at 80° C. for 1 h to obtain a mixture A;

[0064] S2, adding 5.7 kg of hydroxyacetamide into a reaction kettle, mixing with mixture A, reacting at 80° C. for 1 h, to obtain mixture B;

[0065] S3, cooling below 50°C, adding 30kg of base oil into the reactor, mixing with mixture B, and then adding 7.5kg of pentaerythritol tetraisostearate, 1.2kg of 2,6-di-tert-butyl-4-methylphenol, 2kg of nano molybdenum dioxide, 0.3kg of zinc dialkyl dithiophosphate, 5.5kg of polyisobutylene, and 0.75kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0066] Performance testing

[0067] The lubricating greases prepared in Examples 1-7 were subjected to performance tests, and the test results are recorded in Table 1 below.

[0068] Table 1 Test results of Examples 1-7

[0069]

[0070]

[0071] Comparative Example

[0072] Comparative Example 1

[0073] A lubricating grease is prepared by the following steps:

[0074] S1, adding 20 kg of 2-aminobenzamide, 10 kg of diisocyanate and 40 kg of base oil into a reactor, reacting at 80° C. for 2 h to obtain a mixture A;

[0075] S2, cooling below 50°C, adding 30kg of base oil into the reactor, mixing with mixture A, and then adding 7.5kg of pentaerythritol tetraisostearate, 1.2kg of 2,6-di-tert-butyl-4-methylphenol, 2kg of nano molybdenum dioxide, 0.3kg of zinc dialkyl dithiophosphate, 5.5kg of polyisobutylene, and 0.75kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0076] The difference from Example 1 is that the components in Comparative Example 1 do not contain hydroxyacetamide, and the amount of 2-aminobenzamide is increased to 20 kg.

[0077] Comparative Example 2

[0078] A lubricating grease is prepared by the following steps:

[0079] S1, adding 20 kg of hydroxyacetamide, 10 kg of diisocyanate and 40 kg of base oil into a reactor, reacting at 80° C. for 2 h to obtain a mixture A;

[0080] S2, cooling below 50°C, adding 30kg of base oil into the reactor, mixing with mixture A, and then adding 7.5kg of pentaerythritol tetraisostearate, 1.2kg of 2,6-di-tert-butyl-4-methylphenol, 2kg of nano molybdenum dioxide, 0.3kg of zinc dialkyl dithiophosphate, 5.5kg of polyisobutylene, and 0.75kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0081] The difference from Example 1 is that the components in Comparative Example 2 do not contain 2-aminobenzamide, and the amount of hydroxyacetamide is increased to 20 kg.

[0082] Comparative Example 3

[0083] A lubricating grease is prepared by the following steps:

[0084] S1, adding 10 kg of 2-aminobenzamide, 10 kg of diisocyanate and 40 kg of base oil into a reactor, reacting at 80° C. for 1 h to obtain a mixture A;

[0085] S2, adding 10 kg of octadecylamine into a reaction kettle, mixing with mixture A, and reacting at 80° C. for 1 h to obtain mixture B;

[0086] S3, cooling below 50°C, adding 30kg of base oil into the reactor, mixing with mixture B, and then adding 7.5kg of pentaerythritol tetraisostearate, 1.2kg of 2,6-di-tert-butyl-4-methylphenol, 2kg of nano molybdenum dioxide, 0.3kg of zinc dialkyl dithiophosphate, 5.5kg of polyisobutylene, and 0.75kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0087] The difference from Example 1 is that in Comparative Example 3, octadecylamine is used instead of hydroxyacetamide.

[0088] Comparative Example 4

[0089] A lubricating grease is prepared by the following steps:

[0090] S1, adding 10 kg of o-benzylamine, 10 kg of diisocyanate and 40 kg of base oil into a reactor, reacting at 80° C. for 1 h to obtain a mixture A;

[0091] S2, adding 10 kg of hydroxyacetamide into a reaction kettle, mixing with mixture A, reacting at 80° C. for 1 h, to obtain mixture B;

[0092] S3, cooling below 50°C, adding 30kg of base oil into the reactor, mixing with mixture B, and then adding 7.5kg of pentaerythritol tetraisostearate, 1.2kg of 2,6-di-tert-butyl-4-methylphenol, 2kg of nano molybdenum dioxide, 0.3kg of zinc dialkyl dithiophosphate, 5.5kg of polyisobutylene, and 0.75kg of sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0093] The difference from Example 1 is that in Comparative Example 4, o-benzylamine is used instead of 2-aminobenzamide.

[0094] Comparative Example 5

[0095] A lubricating grease is obtained by the following preparation steps:

[0096] S1, adding 10 kg of 2-aminobenzamide, 5 kg of diisocyanate and 20 kg of base oil into a reactor, reacting at 80° C. for 1 h to obtain a mixture A;

[0097] S2, adding 10 kg of hydroxyacetamide, 5 kg of diisocyanate and 20 kg of base oil into another reaction kettle, reacting at 80° C. for 1 h to obtain a mixture B;

[0098] S3, adding mixture B into the reaction kettle containing mixture A, and stirring to mix;

[0099] S4, cooling below 50°C, adding 30kg base oil into the reactor, and then adding 7.5kg pentaerythritol tetraisostearate, 1.2kg 2,6-di-tert-butyl-4-methylphenol, 2kg nano molybdenum dioxide, 0.3kg zinc dialkyl dithiophosphate, 5.5kg polyisobutylene, 0.75kg sodium petroleum sulfonate, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

[0100] Performance testing

[0101] The performance of the greases prepared in Example 1 and Comparative Examples 1-5 was tested, and the test results are recorded in Table 2 below.

[0102] Table 2 Test results of Example 1 and Comparative Examples 1-5

[0103]

[0104] Referring to the above results and comparing the rolling stability of the embodiments and comparative examples, it can be seen that the grease obtained by using amino aromatic amine and hydroxy fatty amine to prepare the thickener has the best shear resistance.

[0105] By comparing the noise and vibration results of the embodiments and comparative examples, it can be seen that the grease prepared according to the component formulation and process of the present application has better low noise performance.

[0106] The above is only the preferred implementation of the present application. The protection scope of the present application is not limited to the above embodiments. All technical solutions under the concept of the present application belong to the protection scope of the present application. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present application should also be regarded as the protection scope of the present application.

Claims

1. A low-noise grease with good shear resistance, characterized in that: The invention is composed of the following components in parts by weight: 60-80 parts of base oil, 20-35 parts of thickener, 5-10 parts of pentaerythritol tetraisostearate, 0.5-2 parts of antioxidant, 1-3 parts of anti-wear extreme pressure agent, 0.1-0.5 parts of metal passivator, 1-10 parts of tackifier and 0.5-1 parts of rust inhibitor; The base oil is polyalphaolefin, and the viscosity at 40°C is 20-200 mm 2 / s; The thickener is amino aromatic amine, hydroxy fatty amine and diisocyanate; The amino aromatic amine is 2-aminobenzamide, and the hydroxy fatty amine is hydroxyacetamide or ethanolamine; the weight ratio of the amino aromatic amine to the hydroxy fatty amine is 1:(0.5-1); The anti-wear extreme pressure agent is one or more of nano molybdenum dioxide, nano tungsten dioxide and isobutylene sulfide; The metal passivator is zinc dialkyl dithiophosphate; The low-noise grease with good shear resistance is prepared by the following steps: S1, dissolving amino aromatic amine and diisocyanate in a portion of base oil, performing a first reaction, and obtaining a mixture A; S2, adding hydroxy fatty amine to mixture A, performing a second reaction, and obtaining mixture B; S3, adding the remaining base oil to the mixture B, and then adding pentaerythritol tetraisostearate, antioxidant, anti-wear extreme pressure agent, metal passivator, viscosity enhancer, rust inhibitor, and sequentially homogenizing, grinding, degassing, and filtering to obtain the finished product.

2. The low-noise grease with good shear resistance according to claim 1, characterized in that: The diisocyanate is toluene diisocyanate and / or 4,4'-diphenylmethane diisocyanate.

3. The low-noise grease with good shear resistance according to claim 1, characterized in that: The antioxidant is one or more of 2,6-di-tert-butyl-4-methylphenol, alkyl diphenylamine, and 1,1,3-tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane.

4. The low-noise grease with good shear resistance according to claim 1, characterized in that: The tackifier is one or more of polyisobutylene, methacrylate and ethylene-propylene rubber.

5. The low-noise grease with good shear resistance according to claim 1, characterized in that: The rust inhibitor is one or more of sulfonate, naphthalenesulfonate and phosphate.

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