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Modified SiO2 lubricating grease and preparation method thereof

A lubricating grease and modification technology, which is applied in the field of modified SiO2 lubricating grease and its preparation, can solve the problems of poor storage stability and shear stability, large grease particle size, and poor stability, and achieve storage stability and shear stability. Good stability and enhanced compatibility

Inactive Publication Date: 2015-02-04
WUXI FEITIAN GREASE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the above SiO 2 Grease has the disadvantages of large particle size, poor stability, poor storage stability and shear stability. The present invention provides a modified SiO 2 Lubricating grease and its preparation method, aiming at obtaining a kind of industrial SiO with high storage stability and shear stability 2 grease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 45% NBR silicone oil into the reaction kettle, raise the temperature to 155-160°C, add 3% silanol, continue to heat up and stir fully, so that the silanol is fully dissolved in the NBR silicone oil; when the temperature rises to 160-165°C , adding 8% SiO 2 , the SiO 2 The specific surface area is 200m 2 / g, the particle size is 10nm, stir evenly, and use three-roll mill to roll oil to prepare modified SiO 2 grease.

[0020] Experimentally, modified SiO 2 The results of the cone penetration of grease with time are as follows:

[0021] Cone penetration / (0.1mm) time / d 140 10 145 20 143 30 141 40 142 50

[0022] It can be seen that SiO 2 The penetration of the grease changes less with time, showing better storage stability and shear stability.

Embodiment 2

[0024] Put 65% of simethicone into the reaction kettle, raise the temperature to 155-160°C, add 5% of silanol, continue to heat up and stir fully, so that silanol is fully dissolved in simethicone; when the temperature rises to 160 -165℃, add 12% SiO 2 , the SiO 2 The specific surface area is 423m 2 / g, the particle size is 20nm, stir evenly, and use three-roll mill to roll oil to prepare modified SiO 2 grease.

[0025] Experimentally, modified SiO 2 The results of the cone penetration of grease with time are as follows:

[0026] Cone penetration / (0.1mm) time / d 169 10 172 20 173 30 170 40 171 50

[0027] It can be seen that SiO 2 The penetration of the grease changes less with time, showing better storage stability and shear stability.

Embodiment 3

[0029] Put 50% of PAO-40 oil into the reaction kettle, raise the temperature to 155-160°C, add 4% of silanol, continue to heat up and stir fully, so that the silanol is fully dissolved in the PAO-40 oil; when the temperature rises to 160 -165℃, add 10% SiO 2 , the SiO 2 The specific surface area is 380m 2 / g, the particle size is 30nm, stir evenly, and use three-roll mill to roll oil to prepare modified SiO 2 grease.

[0030] Experimentally, modified SiO 2 The results of the cone penetration of grease with time are as follows:

[0031] Cone penetration / (0.1mm) time / d 158 10 159 20 157 30 155 40 158 50

[0032] It can be seen that SiO 2 The penetration of the grease changes less with time, showing better storage stability and shear stability.

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Abstract

The invention discloses a modified SiO2 lubricating grease and a preparation method thereof. The modified SiO2 lubricating grease comprises the following components by mass: 8-12% of a thickening agent, 45-65% of base oil, and 3-5% of a modifier. The thickening agent is industrial SiO2, the base oil is NBR silicone oil, dimethicone and PAO-40 oil, and the modifier is silanol. The preparation method includes: putting 45-65% of base oil into a reaction kettle, raising the temperature to 155-160DEG C, adding 3-5% of the modifier, further raising the temperature and fully mixing the materials to make the modifier fully dissolved in the base oil; and when the temperature is raised to 160-165DEG C, adding 8-12% of the thickening agent, stirring the mixture uniformly, and carrying out oil rolling by a three-roller grinding mill, thus obtaining the modified SiO2 lubricating grease. According to the invention, the industrial product SiO2 with small particle size, large specific surface area and controllable surface is adopted as the thickening agent, thus facilitating quick formation of a grid structure and reaching a new equilibrium state. Thus, the obtained SiO2 lubricating grease has good storage stability and shear stability. By using silanol as the modifier, the compatibility of SiO2 particles and the base oil is enhanced.

Description

technical field [0001] The invention belongs to the field of lubricating grease, in particular to a modified SiO 2 Lubricating grease and method for its preparation. Background technique [0002] SiO 2 As an effective sealing grease, grease has been widely used because of its good compatibility with the contact surface, good high and low temperature performance, strong adhesion and good chemical inertness. [0003] Nanoporous silica with high specific surface area is a lightweight ultrafine non-woven powder material, which has the characteristics of high specific surface area, high purity, low density and good dispersion performance. SiO prepared at home and abroad 2 Lubricating grease is comparable to drill bit grease in terms of high temperature resistance, extrusion wear resistance, etc., but it generally has serious defects such as poor storage stability and shear stability. 2 The use of lubricating grease is inconvenient; at the same time, the nano-scale SiO with be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/00C10M113/00C10M177/00C10N50/10C10N40/34
Inventor 张群敏许华平
Owner WUXI FEITIAN GREASE
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