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Preparation method of lubricating grease with viscoelastic characteristics and product prepared by method

A grease and grease soap technology, which is applied in the field of urea-based grease synthesis and preparation, can solve the problems of excessive hardening, grease leakage, and lack of viscoelasticity in polyurea grease during use, and improve the defects of excessive hardening or softening , the effect of long surface adhesion

Inactive Publication Date: 2019-11-15
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyurea grease lacks good viscoelasticity and is prone to excessive hardening or softening during use which may cause the grease to leak from the bearing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 250g of triphenylmethanol and base oil into reactor A, stir and heat to 80°C; add 1170g of MDI (4,4'-diphenylmethane diisocyanate) and base oil into reactor B, stir and heat to 60°C ; 400g dodecylamine and base oil are joined in the reactor C, stirred and heated to 80 ℃ and then the mixed solution in the reactor A is slowly added to the solution reactor B of MDI, and an organometallic catalyst organotin 0.1% is added to control The reaction temperature was 80°C, and the reaction time was 20 minutes. Then slowly add the mixture in reactor A to reactor B. The reaction temperature is gradually raised from 80°C to 120°C at 10°C per hour, and the reaction takes 4 hours; the temperature is rapidly raised to 160°C for high-temperature refining for 30 minutes, the remaining cold oil is added, and the temperature is rapidly cooled to 80°C.

[0019] Whether unreacted MDI remains in the mixture with infrared detection, if the product has the characteristic peak of MDI, add st...

Embodiment 2

[0021] Add 250g of benzyl alcohol and base oil into reactor A, stir and heat to 80°C; add 1170g of MDI (4,4'-diphenylmethane diisocyanate) and base oil into reactor B, stir and heat to 60°C; Add 400g of octadecylamine and base oil to reactor C, stir and heat to 80°C, then slowly add the mixed solution in reactor A to MDI solution reactor B, add organometallic catalyst organotin 0.1%, and control the reaction temperature 80°C, reaction time 20 minutes. Then slowly add the mixture in reactor A to reactor B. The reaction temperature is gradually raised from 80°C to 120°C at 10°C per hour, and the reaction takes 4 hours; the temperature is rapidly raised to 160°C for high-temperature refining for 30 minutes, the remaining cold oil is added, and the temperature is rapidly cooled to 80°C.

[0022] Whether unreacted MDI remains in the mixture with infrared detection, if the product has the characteristic peak of MDI, add stearyl alcohol 2g to carry out neutralization, then heating e...

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PUM

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Abstract

The invention designs a preparation method of urea-based lubricating grease with viscoelastic characteristics and the product prepared by the method. The preparation process is as follows: performinga reaction by using a polyphenyl alcohol, an alkylamine (C6-C18) and diphenylmethane diisocyanate as main raw materials and using a catalyst in a lubricating-oil phase to obtain the viscoelastic urea-based lubricating grease product. The method sequentially comprises the following steps: (1) mixing the polyphenyl alcohol, the alkylamine and base oil, performing heating, when the temperature is rised to 80-90 DEG C, adding the diphenylmethane diisocyanate, and performing a reaction for 2-4 h; (2) mixing the polyphenyl alcohol, the alkylamine and base oil, performing heating, when the temperature is rised to 80-90 DEG C, adding the diphenylmethane diisocyanate, and performing a reaction for 2-4 h; (3) performing heating step by step to 110-120 DEG C, and performing heat preservation treatment for 1 h; and (4) performing heating to 150-180 DEG C, performing high-temperature refining, adding remaining cold oil, performing quenching cooling, and performing grinding to obtain the final product. According to the product obtained by the method, lubricating grease soap fibers contain urethano groups and urea groups, so that the viscoelastic characteristics are given to the lubricating grease; and excessive hardening or softening defects are improved, and longer surface adhesion is obtained.

Description

technical field [0001] The invention relates to the technical fields of chemical synthesis and preparation of lubricating grease, in particular to a method for synthesizing and preparing a lubricating grease containing a urethane group and a urea group, and a urea group with viscoelastic characteristics, and the prepared product. Background technique [0002] Grease is a kind of lubricant, and has the reputation of being the vitamin of mechanical equipment and the fifth element of bearing parts. With the acceleration of China's industrialization 4.0 construction and the advancement of artificial intelligence and industrial automation, China's industrialization process will develop rapidly in the next 10 years. The rapid development of many supporting industries in the field of industrial manufacturing has driven the technological progress of new greases. [0003] The problem to be solved by the present invention [0004] Traditional polyurea-based greases are prepared by d...

Claims

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Application Information

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IPC IPC(8): C10M177/00C10M169/04C10N30/02
CPCC10M169/04C10M177/00C10M2207/023C10M2215/04C10M2215/102
Inventor 万同
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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