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Composite lithium-calcium base lubricating grease and preparation method thereof

A technology of complex lithium-calcium and lubricating grease, which is applied in the chemical field, can solve the problems of unfavorable large-scale industrial production, great influence on colloidal stability, poor high temperature resistance, etc. Abrasion resistance, good mechanical stability effect

Active Publication Date: 2013-03-20
JIANGSU LOPALTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the applicant knows, Chinese patent CN1252434A discloses a composite lithium-calcium-based grease composition and its preparation process. On the low side, high temperature resistance is not good; CN101792689A discloses a high-performance lithium-calcium composite grease composition and its preparation method. In the preparation process, lithium hydroxide suspension is used instead of lithium hydroxide aqueous solution, although the prepared product has Outstanding shear properties and good extreme pressure and anti-wear properties, but the overall cost of the product is high, which is not conducive to large-scale industrial production; and CN102286306A also discloses a high-temperature, water-resistant, long-life composite lithium-calcium-based grease and its preparation method , the small molecular acid boric acid and salicylic acid are introduced into the preparation raw materials, and the one-step preparation process is adopted. The water resistance, mechanical stability and extreme pressure and anti-wear performance of the product are good, but the dropping point can only reach 285°C. , can not meet the requirements of long-term high-temperature use, thereby limiting the application of the product; Chinese patent CN1616612A discloses a lithium-composite grease containing high-basic calcium sulfonate, the grease has good mechanical stability, water resistance, water resistance Rust and high-temperature performance, but the production needs to invert the phase of high-basic calcium sulfonate, so the preparation method is more complicated, and it is difficult to control in industrial production
Similarly, in CN102433206A disclosed a kind of composite lithium calcium base lubricating grease and preparation method, adopt calcium sulfonate to replace calcium hydroxide, also need to use small molecule acid to carry out phase transformation to calcium sulfonate in production, not only raw material cost is high, and It is difficult to control the successful phase transition of calcium sulfonate in the process, and the stability of product quality cannot be guaranteed.
The Chinese patent of CN101921649A discloses a kind of complex lithium-calcium base lubricating grease and its preparation method, makes its product have higher dropping point by adding surfactant in formula, but the impact of surfactant on the colloidal stability of product is relatively small. Large, steel mesh oil separation is greater than 2%
U.S. Patent No. USP5350531 has reported a preparation method of lithium-calcium-based grease. First, bright oil and 12-hydroxystearic acid are mixed at 76-93°C for at least 30 minutes, and then lithium hydroxide and calcium hydroxide are added at 182°C. Carry out saponification reaction at ~232°C, and finally grind and homogenize and thicken. The prepared lubricating grease product has good mechanical stability, and the shear difference of 10 times is 25, but the dropping point is less than 200°C, which cannot meet high temperature performance Require

Method used

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  • Composite lithium-calcium base lubricating grease and preparation method thereof
  • Composite lithium-calcium base lubricating grease and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] In this embodiment, the raw materials are prepared in the following manner for lithium-calcium base grease:

[0024] Step 1. Add 40°C viscosity of 120mm in a fat-making kettle with heating and stirring functions 2 / s,

[0025] 1618g of base oil 500SN and 321.6g of 12-hydroxystearic acid were mixed and stirred and heated to 85°C to completely dissolve the 12-hydroxystearic acid;

[0026] Step 2. Add 24.9g of calcium hydroxide and 23.7g of lithium hydroxide monohydrate mixture dissolved in water with 3 times the amount of alkali, saponify at 85°C for 40min, continue to heat up to 95°C, add 86.7g of sebacic acid, Then add 240ml of an aqueous solution containing 47.4g of lithium hydroxide monohydrate to react for 60min, then raise the temperature to 215°C for high-temperature refining;

[0027] Step 3: Add 659g of base oil 500SN, lower the temperature to 175°C and keep it warm for 15 minutes. When the temperature drops to 85°C, add 15g of diphenylamine, 45g of thionyl...

Embodiment 2

[0031] Step 1. Add 40°C viscosity of 220mm in a fat-making kettle with heating and stirring functions 2 / s,

[0032] 1833g of reduced second-line base oil, 330g of 12-hydroxystearic acid and 62.48g of stearic acid, mixed and stirred and heated to 85°C to completely dissolve the 12-hydroxystearic acid and stearic acid;

[0033] Step 2. Add 40.2g of calcium hydroxide and 22.2g of lithium hydroxide monohydrate mixture dissolved in water with 3 times the amount of alkali, saponify at 80°C for 45min, continue to heat up to 100°C, add 106.5g of sebacic acid, Then add 200ml of an aqueous solution containing 44.4g of lithium hydroxide monohydrate to react for 75min, then raise the temperature to 225°C for high-temperature refining;

[0034] Step 3: Add 319g of second-line base oil, lower the temperature to 180°C and keep it warm for 20 minutes. When the temperature drops to 80°C, add 9g of N-phenyl-α-naphthylamine and 60g of phosphobisoctyl basic zinc Salt, the potassium triborate o...

Embodiment 3

[0038] Step 1. Add 40°C viscosity of 480mm in a fat-making kettle with heating and stirring functions 2 / s,

[0039] 1572g of base oil 150BS and 240.9g of 12-hydroxystearic acid were mixed and stirred and heated to 85°C to completely dissolve the 12-hydroxystearic acid;

[0040] Step 2. Add 13.8g of calcium hydroxide and 21g of lithium hydroxide monohydrate mixture dissolved in water with 3 times the amount of alkali, saponify at 85°C for 60min, continue to heat up to 100°C, add 75.5g of azelaic acid, and then Add 250ml of an aqueous solution containing 42g of lithium hydroxide monohydrate to react for 60min, then raise the temperature to 220°C for high-temperature refining;

[0041] Step 3: Add 786g of base oil 150BS, lower the temperature to 170°C and keep it warm for 30 minutes. When the temperature drops to 85°C, add 12g of diphenylamine, 75g of thionyl octyl zinc salt, 25g of potassium triborate, 50g of Thioaminoester, 6g of 2-mercaptobenzothiadiazole, 30g of nanoscale ca...

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Abstract

The invention relates to lubricating grease and a preparation method thereof, particularly relates to composite lubricating grease and a preparation method thereof, and belongs to the technical field of chemistry. According to the invention, base oil, thickener and additive are prepared into lithium-calcium base lubricating grease according to a proper ratio; the lithium-calcium base lubricating grease has the characteristics of favorable high temperature property, shear stability, extreme pressure wear resistance, water resistance and the like; and the invention is simple in preparation method, stable in product performance, low in product comprehensive cost and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a lubricating grease and a preparation method thereof, in particular to a composite lubricating grease and a preparation method thereof, belonging to the technical field of chemistry. Background technique [0002] With the continuous improvement of my country's industrialization level, high-performance industrial equipment has put forward higher requirements for lubricating grease products, and lubricating grease with only a single performance can no longer meet the lubrication requirements of modern industrial equipment. Lithium-based grease has good multi-effects and is widely used in the lubrication of automobiles, tanks, aircraft, ships, industrial machinery, instruments and meters, etc. The lithium-calcium mixed soap base grease made by adding calcium soap to the lithium base grease can reduce the cost while maintaining the structure and multiple effects of the lithium base grease, and improve its water resistance and wear...

Claims

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Application Information

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IPC IPC(8): C10M169/00C10M121/04C10N30/06C10N30/10C10N30/12
Inventor 石俊峰杨操嵇美栓
Owner JIANGSU LOPALTECH
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