Lubricating grease composition for motor bearing of cooling fan of 5G communication base station and preparation method of lubricating grease composition

文档序号：1961273 发布日期：2021-12-14 浏览：19次中文

阅读说明：本技术 5g通讯基站散热风扇电机轴承润滑脂组合物、制备方法 (Lubricating grease composition for motor bearing of cooling fan of 5G communication base station and preparation method of lubricating grease composition ) 是由陈治冯强刘建龙张兰英郑�硕于 2021-09-28 设计创作，主要内容包括：本发明涉及润滑脂技术领域,具体涉及一种5G通讯基站散热风扇电机轴承润滑脂组合物及其制备方法。本发明提供的润滑脂组合物包括：基础油、稠化剂及添加剂；其特征在于,所述基础油为酯类合成油；所述稠化剂为脂肪族二聚脲；所述脂肪族二聚脲与酯类合成油的质量比为(9-20)：(64-75)；所述添加剂包括石墨烯。本发明得到的润滑脂组合物具有优异的抗氧化性能及抗磨性能,能够适用于微型轴承的苛刻工况条件,对微型轴承实现终身润滑作用,解决了现有5G通讯基站运行过程中存在的润滑脂使用寿命短、风扇噪音大且节能性差的问题。(The invention relates to the technical field of lubricating grease, and particularly relates to a lubricating grease composition for a motor bearing of a cooling fan of a 5G communication base station and a preparation method thereof. The grease composition provided by the invention comprises: base oil, thickener and additives; the base oil is ester synthetic oil; the thickening agent is aliphatic polyurea; the mass ratio of the aliphatic polyurea to the ester synthetic oil is (9-20): (64-75); the additive includes graphene. The lubricating grease composition obtained by the invention has excellent oxidation resistance and wear resistance, can be suitable for severe working conditions of the miniature bearing, realizes a lifelong lubricating effect on the miniature bearing, and solves the problems of short service life, high fan noise and poor energy saving performance of the lubricating grease in the operation process of the existing 5G communication base station.)

1. A grease composition comprising: base oil, thickener and additives; the base oil is ester synthetic oil; the thickening agent is aliphatic polyurea; the additive comprises graphene;

wherein the mass ratio of the graphene to the aliphatic polyurea di-urea is (1-2): (9-20).

2. A grease composition according to claim 1, wherein the aliphatic polyurea di-urea is prepared by a chemical reaction of an organic amine and a diisocyanate;

preferably, the organic amine is one or more of dodecylamine, hexadecylamine or octadecylamine.

3. A grease composition according to claim 1 or 2, characterized in that the graphene is selected from graphene having a thermal conductivity in the range of 200-2000W/mK.

4. A grease composition according to any one of claims 1-3, characterized in that the mass ratio of the aliphatic polyurea di-urea to the synthetic oil of the ester type is (9-20): (64-75).

5. A grease composition according to claim 4, wherein the ester-based synthetic oil is one or more of a trimellitate ester, a polyol ester or a synthetic polyester.

6. A grease composition according to claim 5, wherein when the aliphatic polyurea di-urea is prepared from dodecylamine and diisocyanate, the ester-based synthetic oil is a synthetic oil of a polyol ester and a synthetic polyester;

when the aliphatic polyurea is prepared from hexadecylamine and diisocyanate, the ester synthetic oil is synthetic oil of trimellitate, polyol ester and synthetic polyester;

when the aliphatic polyurea is prepared from octadecylamine and diisocyanate, the ester synthetic oil is synthetic oil of trimellitate and synthetic polyester.

7. A grease composition according to claim 6, characterized in that the additive further comprises: one or more of an antioxidant, an extreme pressure antiwear agent or an antirust agent;

the antioxidant is a tolutriazole derivative and/or p-diisooctyl diphenylamine;

the extreme pressure antiwear agent is a mixture of amine phosphate, zinc dialkyl dithiophosphate and triphenyl thiophosphate;

the antirust agent is calcium dinonylnaphthalenesulfonate and/or barium dinonylnaphthalenesulfonate.

8. A grease composition according to any one of claims 1-7, characterized in that the grease composition comprises the following components: 9-20 parts of a thickening agent, 64-75 parts of base oil, 1-2 parts of graphene, 3-6 parts of an antioxidant, 3-6 parts of an extreme pressure antiwear agent and 1-2 parts of an antirust agent.

9. A method for preparing a grease composition according to any one of claims 1 to 8, comprising:

mixing organic amine for preparing a thickening agent with part of base oil to obtain a first material;

mixing diisocyanate for preparing a thickening agent with the rest of the base oil to obtain a second material;

the first and second materials are mixed and densified before being mixed with additives.

10. Use of a grease composition according to any one of claims 1 to 8 in a bearing; preferably, the bearing is a micro bearing.

Technical Field

The invention relates to the technical field of lubricating grease, and particularly relates to a lubricating grease composition for a motor bearing of a cooling fan of a 5G communication base station, and a preparation method and application thereof.

Background

With the rapid development of the network communication era, various electronic devices such as communication devices, information machines, network servers and the like are gradually developing toward miniaturization and high-speed, the heat flux density of electronic devices is continuously increasing, and the integration level of the electronic devices is higher and higher.

In the operation process of the equipment, the heat generated by the electronic equipment is more and more, the power consumption is continuously increased, the high-temperature operation can cause great influence on the performance of the equipment, and serious consequences such as equipment failure, data loss, product service termination and the like can be caused under serious conditions.

The working principle of the prior heat radiation fan is that heat is radiated in time by the high-speed operation of a fan motor, the working environment temperature of electronic equipment is reduced, the long-term stable and reliable operation of the equipment is ensured, and the service life of the equipment is prolonged to the maximum extent.

The structure of the cooling fan for the 5G communication base station equipment is that the fan and a motor are integrally designed, and the cooling fan usually comprises the motor, a bearing, a blade, a shell and the like, wherein lubricating grease matched with the bearing is sealed in the fan; the bearing is the most important core component of the cooling fan, and the performance of the bearing determines the service life and the cooling effect of the fan.

Different from common bearings (such as 6201 type bearings), the bearings of the cooling fan used for 5G communication base station equipment are mainly micro ball bearings, so that the requirement on dimensional processing precision is high, and the inner diameter of the bearings is usually controlled to be between 3 and 5mm, such as 830 type bearings.

With the construction of a global 5G base station, the operating conditions of the miniature ball bearing are relatively more complex and more severe, such as: high/low temperature adaptability, high rotating speed, high torsion and other harsh working environments.

Based on the harsh working conditions, the lubricating grease which needs to be matched with the micro bearing has the following advantages at the same time: excellent high-temperature oxidation stability, and ensures the long-term normal work of a lubricating part at high temperature; excellent low temperature property, freezing prevention at the low temperature of-40 ℃ below zero, no solidification and good mute effect; excellent antiwear extreme pressure performance, high load capacity, and effective friction reduction; providing overall protection to the bearings, greatly extending bearing life, and the like.

However, the lubricating grease used in cooperation at present is difficult to adapt to various harsh working conditions, and cannot play an ideal lifetime lubricating role, so that problems occur in the use process of the miniature ball bearing and the cooling fan. Taking 830 model bearings and cooling fans assembled by the bearings as examples, the problems mainly exist in the following aspects under the normal working condition of the communication base station equipment under 5G:

(1) lubricating grease has poor ageing resistance, and the workload is large due to frequent replacement of fans: the existing sealing lubricating grease used in a matched manner has short service life (the detection result shows that the service time is less than 900 hours), does not have the effect of lifelong lubrication, and therefore the radiator fan needs to be frequently replaced, but the 5G base stations are wide in distribution and large in quantity, so that the workload is overlarge and the cost is increased due to frequent replacement of the radiator fan.

(2) The bearing vibration value is large, and the fan noise pollution is serious: the ideal bearing vibration value should be controlled within 20db, however, the oxidation resistance of the existing lubricating grease is relatively poor under the harsh working condition, so that the bearing vibration value is large (usually exceeding 25db) in the long-term lubrication process, and serious noise pollution is caused;

(3) the starting power of the fan motor is large, and the energy consumption is relatively high: in the starting stage of the bearing, the starting current generally gradually decreases along with the increase of the rotating speed; however, in the process that the bearing reaches the target rotating speed, the current reduction rate is slow, the starting time is long, the starting power of the motor is large (the detection result shows that the power of the motor is at least more than 2.6W), the energy consumption is increased, and the energy-saving target requirement cannot be met.

Disclosure of Invention

Aiming at the problems, the invention provides a lubricating grease composition with a new formula, which still has excellent lubricating performance, longer service life and good wear resistance under severe working conditions, so that the purpose of lifelong lubrication of a miniature ball bearing under severe working conditions is realized.

The lubricating grease composition provided by the invention comprises base oil, a thickening agent and an additive; wherein the base oil is an ester synthetic oil; the thickening agent is aliphatic polyurea; the additive comprises graphene; the mass ratio of the graphene to the aliphatic polyurea di-urea is (1-2): (9-20).

According to the invention, the aliphatic polyurea and the ester synthetic oil are compounded, and the graphene is added and the proportional relation between the graphene and the aliphatic polyurea is controlled, so that the oxidation resistance and the wear resistance of the lubricating grease composition are obviously improved, the service life of the lubricating grease composition under the severe working condition of the miniature bearing is prolonged, the problems of increased vibration value, serious noise pollution and increased energy consumption of the conventional miniature bearing in long-term lubrication are solved, and the purpose of lifelong lubrication of the miniature bearing is realized.

The research of the invention finds that most of the polyurea di-compounds can improve the oxidation resistance, reduce the noise and the like of the lubricating grease to a certain extent after being blended with ester synthetic oil, such as CN111876218A, but the bearing used in combination with the polyurea di-compounds is different from the micro-bearing of the invention, the corresponding working condition is different, the lubricating grease can not be suitable for the harsh working condition of the micro-bearing, the lubricating grease is oxidized too early, and the problems of the increase of the vibration value and the increase of the energy consumption of the micro-bearing still exist in long-term lubrication.

Further, the aliphatic di-polyurea is prepared by the chemical reaction of organic amine and diisocyanate; preferably, the organic amine is one or more of dodecylamine, hexadecylamine or octadecylamine.

The research of the invention finds that compared with other organic amines, the combination of the aliphatic polyurea prepared by the organic amine and the ester synthetic oil can ensure that the obtained lubricating grease can form a thick enough oil film between a rolling body and a channel under the harsh working condition of a miniature bearing, and simultaneously, the high temperature resistance and the oxidation resistance of the lubricating grease composition are obviously improved, so that the accelerated oxidation of the lubricating grease composition caused by a large amount of bearing heat generated in the high-speed running process of the bearing is avoided, the service life of the lubricating grease composition is prolonged, the vibration value of the miniature ball bearing is obviously reduced, and the noise pollution is reduced; meanwhile, the combination of the aliphatic polyurea and the ester synthetic oil can reduce the starting torque of the miniature bearing of the cooling fan motor and improve the current reduction speed of the motor bearing in the process of reaching constant working rotating speed, thereby being beneficial to reducing the starting power of the motor and realizing the energy-saving effect.

Further, the graphene is selected from graphene with a thermal conductivity of 200-2000W/mK, and preferably, the thermal conductivity is 800W/mK. Research shows that the specific heat capacity of the lubricating grease composition can be further improved and the heat dissipation performance of the lubricating grease composition can be enhanced after the graphene with the thermal conductivity coefficient in the range is combined with the aliphatic polyurea and ester synthetic oil, so that the oxidation resistance and the wear resistance of the lubricating grease composition are improved. If the heat conductivity coefficient is too high, the product cost is obviously improved, and the friction and wear rate is increased; and if the heat conductivity coefficient is too low, the cooling of the temperature rise in the bearing cannot be realized.

Further, the mass ratio of the aliphatic polyurea and the ester synthetic oil is (9-20): (64-75). Although both the ester synthetic oil and the aliphatic polyurea are common lubricating grease components in the field, the present inventors have found that, on the basis of the above-mentioned component relationship of the lubricating grease composition, controlling the mass ratio of the aliphatic polyurea and the ester synthetic oil within this range further improves the low-temperature fluidity and high-temperature resistance of the lubricating grease composition, thereby improving the anti-aging performance thereof.

Further, the ester synthetic oil is one or more of trimellitate, polyol ester or synthetic polyester. The research of the invention finds that compared with other ester synthetic oils, the combination of trimellitate, polyol ester or synthetic polyester and aliphatic dimeric urea can enable the lubricating grease composition to have lower low-temperature fluidity and high-temperature resistance.

Further, the present invention has found that when different ester synthetic oils are formulated with aliphatic diureas prepared from different organic amines, the resulting grease compositions exhibit different properties.

As one embodiment of the present invention, in the grease, when the aliphatic polyurea di-urea is prepared from dodecylamine and diisocyanate, the ester synthetic oil is a synthetic oil of polyol ester and synthetic polyester. Research shows that under the harsh working condition of the micro bearing, the lubricating grease obtained under the combined condition can obviously reduce the vibration value of the micro bearing on the basis of reducing the starting power of a motor and prolonging the service life of the lubricating grease.

Preferably, the mass ratio of the ester synthetic oil, the dodecylamine, the diisocyanate and the graphene is (71-74): (9-13): (1-2), wherein the ester synthetic oil is prepared by combining polyol ester and synthetic polyester in a mass ratio of 1: 1. Research shows that the motor starting power of the lubricating grease obtained under the combined condition is reduced to 2.0W, the service life of the lubricating oil reaches 1445h, and the vibration value of the micro bearing is reduced to 15 db.

As another specific embodiment of the present invention, in the grease, when the aliphatic polyurea di-urea is prepared from hexadecylamine and diisocyanate, the ester-based synthetic oil is a synthetic oil of trimellitic ester, polyol ester, and synthetic polyester. Research shows that under the harsh working condition of the micro bearing, the obtained lubricating grease can obviously prolong the service life of the lubricating grease on the basis of reducing the vibration value of the micro bearing and the power of a motor.

Preferably, the mass ratio of the ester synthetic oil, the hexadecylamine, the diisocyanate and the graphene is (70-73): (14-16): (1-1.5), the ester synthetic oil is prepared by combining trimellitate, polyol ester and synthetic polyester according to a mass ratio of 5:1:1, the obtained lubricating grease can reduce the vibration value of a micro bearing to 17db, the power of a motor is reduced to 2.0W, and the service life of the lubricating grease reaches 1831 h.

As another specific embodiment of the present invention, in the grease, when the aliphatic polyurea di-urea is prepared from octadecylamine and diisocyanate, the ester synthetic oil is a synthetic oil of trimellitate ester and synthetic polyester. Research shows that under the harsh working condition of the micro bearing, the obtained lubricating grease obviously reduces the vibration value of the micro bearing and reduces the power of a motor on the basis of prolonging the service life of the lubricating grease.

Preferably, the mass ratio of the ester synthetic oil, the octadecylamine, the diisocyanate and the graphene is (65-68): (10-11): (1-1.5), the ester synthetic oil is formed by combining trimellitate and synthetic polyester according to the mass ratio of (2.5-3):1, the obtained lubricating grease can reduce the vibration value of the micro bearing to 15db, the power of the motor to 1.6W, and the service life of the lubricating grease reaches 1211 h.

Further, the additive also comprises one or more of an antioxidant, an extreme pressure antiwear agent or an antirust agent;

the antioxidant is a tolutriazole derivative and/or p-diisooctyl diphenylamine. The addition amount of the antioxidant is 3-6% of the total mass of the lubricating grease. Compared with other antioxidants, the antioxidant selected by the invention has the advantages of no precipitation at low temperature and remarkable high-temperature oxidation resistance when being matched with the basic lubricating grease formula consisting of the base oil, the thickening agent and the graphene.

The extreme pressure antiwear agent is one or more of amine phosphate, zinc dialkyl dithiophosphate or triphenyl thiophosphate, and the addition amount of the extreme pressure antiwear agent is 3-6% of the total mass of the lubricating grease. Preferably a mixture of amine phosphate, zinc dialkyldithiophosphate and triphenyl thiophosphate.

The antirust agent is calcium dinonylnaphthalenesulfonate and/or barium dinonylnaphthalenesulfonate, and the addition amount of the antirust agent is 1-2% of the total mass of the lubricating grease. Compared with other extreme pressure antirust agents, the antirust agent selected by the invention has excellent antirust performance when being matched with a basic lubricating grease formula consisting of the base oil, the thickening agent and the graphene.

As another specific embodiment of the present invention, the grease composition comprises the following components: 9-20 parts of a thickening agent, 64-75 parts of base oil, 1-2 parts of graphene, 3-6 parts of an antioxidant, 3-6 parts of an extreme pressure antiwear agent and 1-2 parts of an antirust agent. Research shows that under the compound system, the aging life of the lubricating grease can be obviously prolonged by controlling the proportion of the antioxidant within the range of 3-6%, and the antiwear performance of the lubricating grease can be improved by compounding the extreme pressure antiwear agent and the antirust agent in a mass ratio of 3: 1.

The invention also provides a preparation method of the lubricating grease, which comprises the following steps:

mixing organic amine for preparing a thickening agent with part of base oil to obtain a first material;

mixing diisocyanate for preparing a thickening agent with the rest of the base oil to obtain a second material;

the first and second materials are mixed and densified before being mixed with additives.

As a specific embodiment of the present invention, the preparation method of the grease composition may take the following steps: mixing organic amine for preparing a thickening agent with base oil with the mass of 60%, and heating to 70-90 ℃; simultaneously mixing diisocyanate for preparing a thickening agent with base oil with the mass of 40%, and heating to 70-90 ℃; pouring the two groups of materials into a reaction kettle simultaneously, and stirring at a high speed; wherein the stirring speed is 1200-1500 rpm, and the stirring time is 30-35 min;

heating the mixed material, heating to 90-100 ℃ at the speed of 10 ℃/min, keeping the temperature constant for 5-30 min, and then heating to 190 ℃ at the speed of 5 ℃/min, keeping the temperature constant for 5-30 min;

after the constant temperature is finished, cooling in a water bath, adding additives graphene and an antioxidant when the temperature is reduced to 100 ℃, stirring and cooling to 60 ℃, adding an antirust agent and an antiwear agent, and grinding and degassing to obtain a finished product of lubricating grease; the addition sequence of the additives is as follows.

The preparation method provided by the invention can fully and uniformly mix all the raw materials and exert synergistic effect, so that the lubricating grease composition with excellent oxidation resistance is obtained.

The invention also provides the application of the grease composition in a bearing, and preferably the bearing is a miniature bearing. Researches show that the lubricating grease disclosed by the invention has excellent oxidation resistance under the harsh working condition of the miniature bearing, so that the service life of the lubricating grease is obviously prolonged, the vibration value of the bearing and the power of a motor are reduced, and powerful guarantee is provided for the operation of a 5G communication base station.

The invention has the beneficial effects that:

by combining the requirements of the miniature bearing of the radiator fan of the 5G communication base station on the use working conditions of lifelong lubrication, low energy consumption, silence and the like, the aliphatic polyurea is selected as the thickening agent to be combined with the ester synthetic oil for use, and the obtained lubricating grease has low-temperature fluidity, high-temperature resistance and oxidation resistance, so that the service life of the lubricating grease is effectively prolonged, and the lifelong lubrication effect is realized; meanwhile, the lubricating grease can obviously reduce the vibration value of the miniature bearing and the starting power of the motor in long-term lubrication, thereby meeting the harsh working condition of the miniature bearing, and realizing the aims of reducing noise pollution and improving energy conservation.

Meanwhile, graphene is added on the basis of the basic formula, so that the heat dissipation performance of the lubricating grease is further improved, the service life of the lubricating grease is prolonged, and the vibration value of the micro bearing is reduced; in addition, the invention also preferably selects the compounding relationship of the antioxidant, the extreme pressure antiwear agent and the antirust agent with the basic formula, and improves the comprehensive oxidation resistance, the antiwear performance and the antirust performance of the lubricating grease; through the compounding relation of the components, the obtained lubricating grease can be suitable for the severe working condition of the micro bearing, and the problems of short service life, high fan noise and poor energy saving performance in the use process of the conventional lubricating grease are solved.

Detailed Description

The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Each of the components in the following examples is commercially available.

Example 1

The embodiment provides a lubricating grease composition, which comprises the following components in percentage by mass:

48.0 percent of trimellitic acid ester, 24.0 percent of polyol ester, 9.0 percent of dodecylamine and diisocyanate, 1.0 percent of tolutriazole derivative, 3.0 percent of p-diisooctyl diphenylamine, 1 percent of triphenyl thiophosphate, 2 percent of zinc dialkyl dithiophosphate, 3 percent of liquid amine phosphate, 1 percent of calcium dinonyl naphthalene sulfonate and 1.0 percent of graphene.

Example 2

The embodiment provides a lubricating grease composition, which comprises the following components in percentage by mass:

66% of trimellitate, 5% of synthetic polyester, 12% of dodecylamine and diisocyanate, 1.5% of tolutriazole derivative, 1.5% of p-diisooctyl diphenylamine, 1% of triphenyl thiophosphate, 3% of zinc dialkyl dithiophosphate, 2% of liquid amine phosphate, 2% of barium dinonyl naphthalene sulfonate and 1.5% of graphene.

Example 3

The embodiment provides a lubricating grease composition, which comprises the following components in percentage by mass:

37% of polyol ester, 37% of synthetic polyester, 12% of dodecylamine and diisocyanate, 1% of tolutriazole derivative, 3% of p-diisooctyldiphenylamine, 2% of triphenyl thiophosphate, 3% of zinc dialkyldithiophosphate, 1% of liquid amine phosphate, 2% of calcium dinonylnaphthalenesulfonate and 1% of graphene.

Example 4

The embodiment provides a lubricating grease composition, which comprises the following components in percentage by mass:

65% of trimellitic acid ester, 5% of polyol ester, 13% of dodecylamine and diisocyanate, 0.5% of tolutriazole derivative, 2.5% of p-diisooctyl diphenylamine, 3% of triphenyl thiophosphate, 1% of zinc dialkyl dithiophosphate, 1% of liquid amine phosphate, 1.5% of barium dinonyl naphthalene sulfonate and 2% of graphene.

Example 5

The embodiment provides a lubricating grease composition, which comprises the following components in percentage by mass:

3% of polyol ester, 70% of synthetic polyester, 14% of hexadecylamine and diisocyanate, 1% of tolutriazole derivative, 3% of p-diisooctyl diphenylamine, 1% of triphenyl thiophosphate, 1% of zinc dialkyl dithiophosphate, 1% of liquid amine phosphate, 2% of calcium dinonylnaphthalene sulfonate and 1% of graphene.

Example 6

The embodiment provides a lubricating grease composition, which comprises the following components in percentage by mass:

50% of trimellitate, 10% of polyol ester, 10% of synthetic polyester, 16% of hexadecylamine and diisocyanate, 1% of tolutriazole derivative, 3% of p-diisooctyl diphenylamine, 1% of triphenyl thiophosphate, 1.5% of zinc dialkyl dithiophosphate, 2% of liquid amine phosphate, 1% of calcium dinonylnaphthalene sulfonate and 1% of graphene.

Example 7

The embodiment provides a lubricating grease composition, which comprises the following components in percentage by mass:

60% of trimellitate, 5% of polyol ester, 10% of octadecylamine and diisocyanate, 2% of tolutriazole derivative, 1% of p-diisooctyl diphenylamine, 2.5% of triphenyl thiophosphate, 1.5% of zinc dialkyl dithiophosphate, 1.5% of liquid amine phosphate, 1.5% of calcium dinonylnaphthalene sulfonate and 1% of graphene.

Example 8

The embodiment provides a lubricating grease composition, which comprises the following components in percentage by mass:

50% of trimellitate, 18% of synthetic polyester, 10% of octodecamine and diisocyanate, 1% of tolutriazole derivative, 3% of p-diisooctyl diphenylamine, 3% of triphenyl thiophosphate, 1% of zinc dialkyl dithiophosphate, 2% of liquid amine phosphate, 2% of calcium dinonylnaphthalene sulfonate and 1% of graphene.

Example 9

This example provides a method of preparing the grease composition described in example 1, comprising the steps of: