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

A technology of hexapolyurea-based grease and composite calcium-based grease, which is applied in lubricating compositions, petroleum industry, thickeners, etc., can solve the problems of poor comprehensive performance of calcium-based polyurea grease, and achieve excellent comprehensive performance. Performance, overcoming hardening, and avoiding the effect of strong volatilization

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 try to introduce polyurea grease in complex calcium base grease, for example, CN1364859A and CN1657599A disclose respectively by introducing dipolyurea in complex calcium base grease And the obtained calcium-based polyurea grease, however, the overall performance of these calcium-based polyurea greases is not good

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

[0018] The invention provides a preparation method of composite calcium-based hexapolyurea grease, the method comprising the following steps:

[0019] (1) In the presence of lubricating base oil, contact and react calcium hydroxide, higher fatty acid and dibasic aromatic acid, heat up and dehydrate the mixture obtained after the reaction, and then lower the temperature to 50-80°C (preferably 60-75°C ), to obtain complex calcium-based grease;

[0020] (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.

[0021] In step (1), the conditions for the contact reaction of calcium hydroxide, higher fatty acid and dibasic aromatic acid may include: the reaction temperature is 80-90° C., and the reaction time is 10-60 minutes.

[0022] In one embodiment...

Embodiment 1

[0054] This example is used to illustrate the complex calcium-based hexapolyurea grease of the present invention and its preparation method.

[0055] Raw material components: HVI500SN base oil (viscosity of 11mm at 100°C 2 / s, purchased from ExxonMobil Chemical Company): 861g; octadecylamine (purchased from ACROS): 24.85g; ethylenediamine: 5.54g; 4,4'-diphenylmethane diisocyanate (purchased from ACROS company, MDI): 34.61g; terephthalic acid: 34.3g; Ca(OH) 2 : 21g; 12-hydroxystearic acid (purchased from Tongliao Weining Chemical Co., Ltd.): 23.7g; tungsten disulfide: 7.5g; selenium disulfide: 12.5g; graphite fluoride: 12.5g; Diphenylamine: 7.5 g; Zinc naphthenate: 12.5 g.

[0056] Mix 500g of HVI500SN base oil with 23.7g of 12-hydroxystearic acid and 34.3g of terephthalic acid, stir evenly, raise the temperature to 80°C, add dropwise lime milk solution containing 21g of calcium hydroxide, and saponify with rapid stirring for 60 minutes , the temperature was raised to 105°C,...

Embodiment 2

[0066] This example is used to illustrate the complex calcium-based hexapolyurea grease of the present invention and its preparation method.

[0067] Composite calcium-based hexaurea grease was prepared according to the method of Example 1, the difference being that terephthalic acid was replaced by isophthalic acid of the same molar amount, thereby preparing composite calcium-based hexapolyurea 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 binary 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 octa-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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