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Complex-calcium-based tetrapolyurea lubricating grease and preparation method thereof

A technology of calcium-based tetrapolyurea grease and lubricating base oil, applied in lubricating compositions, petroleum industry, thickeners, etc., can solve the problem of volatilization, shear stability not improved, complex calcium-based grease comprehensive performance problems such as poor comprehensive performance, to achieve the effect of overcoming poor comprehensive performance and excellent comprehensive performance

Active Publication Date: 2013-08-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the hardening problem that complex calcium base grease exists, those skilled in the art attempt to introduce polyurea grease in complex calcium base grease, for example, US5084193 discloses the grease containing polyurea and complex calcium soap and preparation method thereof, The method includes: first preparing polyurea grease and then preparing composite calcium-based grease, but after the polyurea grease is prepared, the temperature in the reactor can be as high as 89-90°C, and serious volatilization will occur when short-chain acids are added later, and according to The overall performance of the complex calcium-based grease prepared by this method is not good, and needs to be further improved
CN1364859A and CN1657599A disclose calcium-based polyurea grease respectively, yet, the polyurea that they use all is dipolyurea, and their shear stability is still not improved

Method used

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  • Complex-calcium-based tetrapolyurea lubricating grease and preparation method thereof
  • Complex-calcium-based tetrapolyurea lubricating grease and preparation method thereof
  • Complex-calcium-based tetrapolyurea lubricating grease and preparation method thereof

Examples

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preparation example Construction

[0016] The preparation method of described composite calcium-based tetrapolyurea grease according to the present invention comprises the following steps:

[0017] (1) In the presence of lubricating base oil, calcium hydroxide, higher fatty acid and aromatic acid are contact-reacted, the mixture obtained after the reaction is heated and dehydrated, and then cooled to 50-80°C (preferably 70-80°C), Obtain calcium complex grease;

[0018] (2) Add diisocyanate and diamine in sequence to the complex calcium-based grease, add monoamine after mixing and contacting for at least 5 minutes, heat up to 100-120°C for contact reaction, and heat up the mixture obtained after the reaction to refine , wherein the molar ratio of the amount of diisocyanate, diamine and monoamine is (1.9-2.1): 1: (1.9-2.1).

[0019] According to the method of the present invention, in step (1), the lubricating grease obtained after dehydration is cooled to 50-80° C., and in step (2), monoamine is added after add...

Embodiment 1

[0061] This example is used to illustrate the complex calcium-based tetrapolyurea grease of the present invention and its preparation method.

[0062] Raw material components: HVI500SN base oil (purchased from ExxonMobil Chemical Company, viscosity at 100°C is 11mm 2 / s): 862g; octadecylamine (purchased from ACROS company): 31.87g; ethylenediamine: 3.56g; 4,4'-diphenylmethane diisocyanate (purchased from ACROS company, MDI): 29.57g; Phthalic acid: 29.05g; Benzoic acid: 10.68g; Ca(OH) 2 : 19.11g; 12-hydroxystearic acid (purchased from Tongliao Weining Chemical Co., Ltd.): 23.7g; tungsten disulfide: 7.5g; selenium disulfide: 12.5g; fluorinated graphite: 12.5g; Diphenylamine: 7.5g; Zinc naphthenate: 12.5g;

[0063] Mix 500g of HVI500SN base oil with 23.7g of 12-hydroxystearic acid, 29.05g of terephthalic acid and 10.68g of benzoic acid, stir evenly, raise the temperature to 80°C, add dropwise lime milk solution containing 19.11g of calcium hydroxide , rapid stirring and saponi...

Embodiment 2

[0071] This example is used to illustrate the complex calcium-based tetrapolyurea grease of the present invention and its preparation method.

[0072] Composite calcium-based tetrapolyurea grease was prepared according to the method of Example 1, the difference being that terephthalic acid was replaced with 2 times the molar amount of benzoic acid, thereby preparing composite calcium-based tetrapolyurea grease.

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Abstract

The invention relates to a complex-calcium-based tetrapolyurea lubricating grease and a preparation method thereof. The preparation method comprises the steps that: (1) under the existence of a lubricating base oil, calcium hydroxide, higher fatty acid, and aromatic acid are subjected to contact reaction; a mixture obtained after the reaction is subjected to heating dehydration, and is cooled to 50-80 DEG C, such that complex-calcium-based lubricating grease is obtained; (2) diisocyanate and diamine are sequentially added into the complex-calcium-based lubricating grease, and mixed contact is allowed for at least 5min; monoamine is added, and the mixture is heated to 100-120 DEG C, such that contact reaction is carried out; and a mixture obtained after the reaction is heated and refined. A dose molar ratio of diisocyanate to diamine to monoamine is (1.9-2.1):1:(1.9-2.1). The complex-calcium-based tetrapolyurea lubricating grease provided by the invention has excellent comprehensive performance.

Description

technical field [0001] The invention relates to a method for preparing composite calcium-based tetrapolyurea grease and the composite calcium-based tetrapolyurea grease prepared by the method. Background technique [0002] Polyurea grease (referred to as polyurea grease) is a grease prepared by thickening base oil with organic compounds containing urea groups in the molecule. Since the polyurea thickener is different from the metal soap-based thickener, it does not contain metal ions, which avoids the catalytic oxidation of the metal ions in the soap-based thickener to the grease base oil, so the polyurea grease has good oxidation stability. Excellent performance and thermal stability, making polyurea grease more suitable for lubrication under high temperature conditions. [0003] At present, the reports of articles and patents mainly focus on the preparation and synthesis of dipolyurea grease. The shear stability of dipolyurea grease is poor, and the difference between 100...

Claims

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Application Information

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IPC IPC(8): C10M123/02C10M169/06C10M177/00
Inventor 王佳孙洪伟何懿峰刘磊翟浩川段庆华刘中其姜靓
Owner CHINA PETROLEUM & CHEM CORP
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