阅读说明：本技术 一种链条高低温润滑脂及其制备方法和应用 (Chain high-low temperature lubricating grease and preparation method and application thereof ) 是由 曾晖 王义珍 于 2019-09-24 设计创作，主要内容包括：本发明公开了一种链条高低温润滑脂,由以下重量百分数的各组分组成：基础油70％～88％,复合锂皂稠化剂12％～30％；所述基础油为闪点220℃,倾点-40℃,水分≤0.1％的高纯度聚醚油。本发明以特定的聚醚油为润滑脂基础油,充分利用聚醚油高低温性能好、低温性能稳定的特点；采用复合锂基金属皂基进行一步法稠化,方法简单,节约生产能耗；所述润滑脂具备良好的胶体安定性与机械安定性,可以在高温至低温的苛刻工况条件下工作,可在很宽的温度范围内提供最大轴承运行寿命；聚醚基础油与稠化剂恰当分配,不需要额外添加抗氧剂和抗腐蚀剂就能够有效的保护机械装置链条,使其长期处于润滑状态且不易氧化生锈。(The invention discloses a chain high-low temperature lubricating grease which comprises the following components in percentage by weight: 70-88% of base oil and 12-30% of composite lithium soap thickening agent; the base oil is high-purity polyether oil with a flash point of 220 ℃, a pour point of-40 ℃ and water content of less than or equal to 0.1 percent. The invention takes the specific polyether oil as the base oil of the lubricating grease, and fully utilizes the characteristics of good high-low temperature performance and stable low-temperature performance of the polyether oil; the composite lithium-based metal soap base is adopted for one-step thickening, the method is simple, and the production energy consumption is saved; the lubricating grease has good colloid stability and mechanical stability, can work under severe working conditions from high temperature to low temperature, and can provide the maximum bearing operation life within a wide temperature range; the polyether base oil and the thickening agent are properly distributed, and the mechanical device chain can be effectively protected without adding an antioxidant and an anticorrosive agent, so that the mechanical device chain is in a lubricating state for a long time and is not easy to oxidize and rust.)

1. The chain high-low temperature lubricating grease is characterized by comprising the following components in percentage by mass: 70-88% of base oil and 12-30% of composite lithium soap thickening agent; the base oil is high-purity polyether oil with a flash point of 220 ℃, a pour point of-40 ℃ and water content of less than or equal to 0.1 percent.

2. The chain high and low temperature grease of claim 1 wherein the complex lithium soap thickener is a complex of a lithium 12-hydroxystearate and a lithium sebacate; the mass of the 12-hydroxy lithium stearate is 8-20% of that of the lubricating grease, and the mass of the sebacic acid lithium salt is 2-10% of that of the lubricating grease.

3. The chain high and low temperature grease of claim 1, wherein the polyether is polyether SDT-055 a.

4. The preparation method of the chain high and low temperature lubricating grease as claimed in any one of claims 1 to 3, characterized by comprising the following steps:

s1, adding hydroxy fatty acid, low-molecular acid and base oil into a reaction container, heating and stirring for 1-2 hours to dissolve, and then adding a lithium hydroxide hot solution to saponify;

s2, heating the system for dewatering for 2-3 hours, and then continuously heating and puffing;

and S3, stopping heating, keeping stirring, and cooling the system to room temperature to obtain the chain high-low temperature lubricating grease.

5. The method according to claim 4, wherein the hydroxy fatty acid is 12-hydroxystearic acid, the low molecular acid is sebacic acid, and the base oil is polyether SDT-055 a.

6. The preparation method of claim 5, wherein the reaction system of step S1 comprises, by mass, 8-20% of 12-hydroxystearic acid, 2-10% of sebacic acid, and 70-88% of polyether SDT-055 a.

7. The method according to claim 5, wherein the saponification in step S1 is carried out at 95-105 ℃ for 1-2 hours with stirring.

8. The method according to claim 5, wherein the dehydration temperature of step S2 is 115-125 ℃ and the puffing temperature is 155-165 ℃.

Technical Field

The invention relates to the technical field of lubricating grease, and particularly relates to chain high-low temperature lubricating grease and a preparation method and application thereof.

Background

Lubricating grease is an important component of industrial lubricants, is a solid to semisolid lubricating material with plasticity, consists of a thickening agent and base oil, is often added with various functional additives to improve the performance of the lubricating material in order to meet the harsh application conditions, and is widely applied to the industries of steel, automobiles, aerospace and military. The chains in the mechanical transmission device are easy to be oxidized, rusted and passivated, the service life is influenced, and the working environment is complex. Therefore, the grease is required to have the functions of oxidation resistance and corrosion resistance, long service life and high and low temperature stability, and to maintain good continuity of the chain in wind, rain or solarization.

Patent CN101967417A discloses a bentonite grease containing polyether in base oil, which can thicken the base oil without using polar dispersant. The synthesized lubricating grease needs the mixing of various base oils, the process is relatively complex, and the used raw materials are relatively complex. Patent CN1353174 discloses a high-temperature lubricating grease, the base oil of which is a mixture of polyether and silicone oil, and the thickening agent is molybdenum disulfide powder and antimony antimonous sulfide. The product has no dropping point, is suitable for harsh conditions of high temperature and high pressure, and is not suitable for chain lubrication under common conditions. Group patent CN1847376 discloses a special grease for wear resistance and rust resistance of chains, which has a long preparation time, a dropping point only reaching 85 ℃ and poor high-temperature stability. In the above research on the lubricating grease, the process is complex and the number of additives is large. The general high-low temperature lubricating grease is long-acting high-temperature lubricating grease which is refined by polyurea compound thickening high-temperature resistant phenyl silicone oil and additives such as wear resistance, oxidation resistance, rust prevention, corrosion resistance and the like. Patents CN103265998A, CN104403766A, CN106479610A and the like all disclose lubricating grease with high and low temperature stability and with oxidation resistance and corrosion resistance, which are all prepared by adding functional auxiliary agents such as antioxidant, corrosion resistance and the like to realize the oxidation resistance, corrosion resistance and the like of the lubricating grease; at present, no lubricating grease composition which only consists of lubricating grease base oil and a thickening agent and can realize the purposes of oxidation resistance, corrosion resistance and the like exists.

Disclosure of Invention

The invention aims to overcome the defects and shortcomings in the prior art and provide the chain high-temperature and low-temperature lubricating grease.

The invention also aims to provide a preparation method of the chain high-low temperature grease.

The invention further aims to provide application of the chain high-temperature and low-temperature lubricating grease.

The above object of the present invention is achieved by the following technical solutions:

the chain high-low temperature lubricating grease comprises the following components in percentage by mass: 70-88% of base oil and 12-30% of composite lithium soap thickening agent; the base oil is high-purity polyether oil with a flash point of 220 ℃, a pour point of-40 ℃ and water content of less than or equal to 0.1 percent.

The composite lithium-based lubricating grease only consists of base oil and a thickening agent, and particularly takes specific polyether oil as lubricating grease base oil, so that the characteristics of good high-temperature and low-temperature performance and stable low-temperature performance of the polyether oil are fully utilized; meanwhile, the composite lithium-based metal soap base is adopted for one-step thickening, so that the method is simple and saves production energy consumption; the product has good colloid stability and mechanical stability, and the base oil can effectively protect a mechanical device chain due to high-temperature stability and proper distribution of a thickening agent, so that the chain can be in a lubricating state for a long time without additionally adding an antioxidant and an anticorrosive agent and is not easy to oxidize and rust.

Preferably, the composite lithium soap thickening agent is a composite of 12-lithium hydroxystearate and lithium sebacate, the mass percent of the 12-lithium hydroxystearate is 8-20%, and the mass percent of the lithium sebacate is 2-10%; the lubricating grease prepared by using the composite lithium soap of 12-hydroxystearic acid and dibasic acid as a thickening agent has the advantages of high dropping point, excellent mechanical stability, excellent water resistance, rust resistance and oxidation stability.

Preferably, the polyether oil is polyether SDT-055 a.

The invention also provides a preparation method of the chain high-low temperature lubricating grease, which specifically comprises the following steps:

s1, adding hydroxy fatty acid, low-molecular acid and base oil into a reaction container, heating and stirring for 1-2 hours to dissolve, and then adding a lithium hydroxide hot solution to saponify;

s2, heating the system for dewatering for 2-3 hours, and then continuously heating and puffing;

and S3, stopping heating, keeping stirring, and cooling the system to room temperature to obtain the chain high-low temperature lubricating grease.

Preferably, the hydroxy fatty acid is 12-hydroxystearic acid, the low molecular acid is sebacic acid, and the base oil is polyether SDT-055 a.

Preferably, the mass percentages of the components in the reaction system of the step S1 are 8-20% of 12-hydroxystearic acid, 2-10% of sebacic acid and 70-88% of polyether SDT-055 a.

Preferably, the saponification in the step S1 is carried out at 95-105 ℃ and stirred for reaction for 1-2 h; in the step S2, the dehydration temperature is 115-125 ℃, and the puffing temperature is 155-165 ℃.

Compared with the prior art, the invention has the following beneficial effects:

the high-low temperature lubricating grease for the chain takes the specific polyether oil as the base oil of the lubricating grease, and fully utilizes the characteristics of good high-low temperature performance and stable low-temperature performance of the polyether oil; the composite lithium-based metal soap base is adopted for one-step thickening, the method is simple, and the production energy consumption is saved; the lubricating grease has good colloid stability and mechanical stability, can work under severe working conditions from high temperature to low temperature, can provide the maximum bearing operation life within a wide temperature range, and is applicable to the temperature range: the temperature of the highest intermittent heat resistance can reach 300 ℃ below zero between 50 ℃ below zero and 260 ℃; according to the invention, the specific polyether base oil and the thickening agent are properly distributed, and the mechanical device chain can be effectively protected without adding auxiliary agents such as an antioxidant, an anticorrosive agent and the like, so that the mechanical device chain is in a lubricating state for a long time and is not easy to oxidize and rust.

The specific implementation mode is as follows:

the present invention is further illustrated by the following specific examples in the specification, which are not intended to limit the invention in any way. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.

Unless otherwise indicated, reagents and materials used in the following examples are commercially available.