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Composite calcium-base hexa-polyurea lubricating grease and preparation method thereof

A technology based on hexapolyurea grease and complex calcium base grease, which can be used in lubricating compositions, petroleum industry, thickeners, etc. Problems such as poor performance, to achieve excellent comprehensive performance and overcome the effect of poor comprehensive performance

Active Publication Date: 2015-01-14
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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  • Composite calcium-base hexa-polyurea lubricating grease and preparation method thereof
  • Composite calcium-base hexa-polyurea lubricating grease and preparation method thereof
  • Composite calcium-base hexa-polyurea lubricating grease and preparation method thereof

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preparation example Construction

[0016] The preparation method of described composite calcium-based hexapolyurea 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 60-75°C), Obtain calcium complex grease;

[0018] (2) Add diisocyanate, diamine and monoamine to the complex calcium-based grease, carry out a contact reaction at 80-120°C, and heat up the mixture obtained after the reaction to refine, wherein, diisocyanate, diamine The molar ratio with the amount of monoamine is (2.9-3.1):(1.9-2.1):2.

[0019] According to the method of the present invention, in step (1), in order to further improve the overall performance of the complex calcium-based hexapolyurea grease prepared according to the method of the present invention, particularly mechanical stabilit...

Embodiment 1

[0059] This example is used to illustrate the complex calcium-based hexapolyurea grease of the present invention and its preparation method.

[0060] 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): 24.85g; ethylenediamine: 5.54g; 4,4'-diphenylmethane diisocyanate (purchased from ACROS company, MDI): 34.61g; 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;

[0061] 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 saponif...

Embodiment 2

[0069] This example is used to illustrate the complex calcium-based hexapolyurea grease of the present invention and its preparation method.

[0070] Composite calcium-based hexaurea 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 hexaurea grease.

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Abstract

The invention relates to a composite calcium-base hexa-polyurea lubricating grease and a preparation method thereof. The preparation method comprises the following steps: (1) in the presence of lubricating base oil, carrying out contact reaction on calcium hydroxide, higher fatty acid and aromatic acid, heating to dehydrate the reaction mixture, and cooling to 50-80 DEG C to obtain a composite calcium-base lubricating grease; and (2) adding diisocyanate, diamine and monoamine into the composite calcium-base lubricating grease, carrying out contact reaction at 80-120 DEG C, and heating the reaction mixture for refinement, wherein the diisocyanate:diamine:monoamine mol ratio is (2.9-3.1):(1.9-2.1):2. The composite calcium-base hexa-polyurea lubricating grease provided by the invention has excellent comprehensive properties.

Description

technical field [0001] The invention relates to a preparation method of a composite calcium-based hexaurea grease and the composite calcium-based hexaurea 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 100,000 ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M123/06C10M169/06C10M177/00C10N50/10
Inventor 何懿峰王佳孙洪伟刘磊翟浩川段庆华刘中其姜靓
Owner CHINA PETROLEUM & CHEM CORP
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