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Hexapolyurea grease and preparation method thereof

A technology of hexapolyurea and lubricating grease, applied in the field of lubricating materials and their preparation, can solve the technical enlightenment that has not been seen in patent and non-patent literature, the mechanical stability of polyurea grease is reduced, the molecular crosslinking density Increase and other problems, to achieve the effect of meeting the requirements of industrial scale-up production, concise process steps, and excellent lubricity

Inactive Publication Date: 2019-05-21
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, in the process of preparing polyurea grease, organic diamines such as p-phenylenediamine are generally used in an almost conventional manner, but since the two amine groups of p-phenylenediamine are distributed on the same benzene ring, it is difficult to prepare During the reaction process of polyurea, the molecular cross-linking density will increase, the molecular chain will be difficult to relax, and the molecular stress will be too concentrated, resulting in a decrease in the mechanical stability of polyurea grease.
Although people are working hard to make up for the aforementioned shortcomings, there are no breakthrough technical revelations in the patents and non-patent literature published so far. The technical solutions to be introduced below are produced under this background

Method used

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  • Hexapolyurea grease and preparation method thereof
  • Hexapolyurea grease and preparation method thereof
  • Hexapolyurea grease and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Based on the weight of grease, it includes the following components, 90% by weight of mineral oil, 20% by weight of diisocyanate A, organic monoamine, organic diamine and diisocyanate B in a molar ratio of 2:2:2:1 The hexaurea thickener prepared by addition polymerization, wherein: the diisocyanate A is toluene diisocyanate; the organic monoamine is octadecylamine; the organic diamine is phenylenediamine; Described diisocyanate B is the same as described diisocyanate A; The step of preparing hexaurea grease is as follows:

[0028] A) Weigh toluene diisocyanate and mineral oil by weight and add to the reaction kettle, stir and dissolve when the temperature is raised to 70°C;

[0029] B) First mix the phenylenediamine weighed by weight with mineral oil and heat to dissolve to obtain the first oil solution, then slowly add the first oil solution to the reaction kettle described in step A) and react at 65°C 65min;

[0030] C) firstly mix the octadecylamine weighed by weig...

Embodiment 2

[0034] Based on the weight of grease, it includes the following components, 60% by weight of a mixture of mineral oil and vegetable oil, 10% by weight of diisocyanate A, organic monoamine, organic diamine and diisocyanate B in a molar ratio of 2:2 : 2: 1 polyurea thickener prepared by addition polymerization, wherein: the diisocyanate A is a mixture of methyl diphenyl diisocyanate, diphenylmethane diisocyanate and m-xylylene diisocyanate ; Described organic monoamine is the mixture of dodecylamine, cetylamine, p-toluidine and cyclohexylamine; Described organic diamine is o-phenylenediamine, ethylenediamine, propylenediamine and phenylenediamine Mixture; Described diisocyanate B is the same as described diisocyanate A; The step of preparing hexaurea grease is as follows:

[0035] A) Weigh the mixture of methyl diphenyl diisocyanate, diphenylmethane diisocyanate and m-xylylene diisocyanate and the mixture of mineral oil and vegetable oil by weight and add it to the reaction kett...

Embodiment 3

[0041] Based on the weight of grease, it includes the following components, 30% by weight of a mixture of synthetic oil, mineral oil and vegetable oil, and 35% by weight of diisocyanate A, organic monoamine, organic diamine and diisocyanate B. 2:2:2:1 Hexaurea thickener prepared by addition polymerization, wherein: the diisocyanate A is a mixture of 4,4-diphenylmethane diisocyanate and diphenylmethane diisocyanate; The organic monoamine is the mixture of p-chloroaniline, m-chloroaniline and aniline; the organic diamine is the mixture of the aromatic amine of 4,4-biphenyldiamine and the linear aliphatic amine of 1,6-hexanediamine. Mixture; Described diisocyanate B is the same as described diisocyanate A; The step of preparing hexaurea grease is as follows:

[0042] A) Weigh 4,4-diphenylmethane diisocyanate and a mixture of diphenylmethane diisocyanate and a mixture of synthetic oil, mineral oil and vegetable oil by weight and add them to the reaction kettle, stirring and dissol...

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Abstract

The invention relates to hexapolyurea grease and a preparation method thereof. The method includes the steps that diisocyanate A and lubricant base oil are weighed according to weight and added into areaction still, the temperature is raised, and the mixture is stirred and dissolved; organic diamine and the lubricant base oil are weighed according to weight for mixing, the mixture is heated and dissolved to obtain a first oil solution, the first oil solution is slowly added into the reaction still for a reaction, organic monoamine and the lubricant base oil are weighed according to weight formixing, the mixture is heated and dissolved to obtain a second oil solution, and then the second oil solution is slowly added into the reaction still for a continuous reaction; diisocyanate B and thelubricant base oil are weighed according to weight for mixing and added into the reaction still for a constant-temperature reaction; the reaction still is heated, constant-temperature refining is carried out, and then stirring, cooling, grinding and degassing are carried out in sequence to obtain a finished product of the hexapolyurea grease. Excellent lubricity, high-temperature resistance, mechanical stability, thermal stability, a high dropping point and high extreme pressure abrasion resistance are achieved; the method has the advantages that process steps are simple, reaction conditionsin a preparation process are mild, process elements are not harsh, and industrial large-scale production requirements are met.

Description

technical field [0001] The invention relates to the technical field of lubricating materials and their preparation, in particular to a hexapolyurea grease, and also to a preparation method thereof. Background technique [0002] Polyurea grease is obtained by thickening base oil with urea, an organic compound. Since the thickener does not contain metal ions, it avoids the oxidation and catalytic effect of metal ions on base oil. Usually prepared polyurea grease has excellent oxidation stability, thermal stability, lubricity and other excellent properties, and the service life of polyurea grease is also long. It is a multifunctional grease. The lubricating grease prepared by polyurea can meet the use requirements of contacting with bad media under different working conditions such as high temperature, low temperature, high load and wide temperature range, so it is widely used in automobiles, electrical appliances, food, metallurgy, manufacturing and other industries middle. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/02C10M149/20C10N30/06C10N30/08C10N30/10C10N50/10
Inventor 耿飞白涛潘明均左明明左晓兵
Owner CHANGSHU INSTITUTE OF TECHNOLOGY