CN105331434A - Conductive grease composition and preparation method thereof - Google Patents

Abstract

The invention discloses conductive grease composition and a preparation method thereof. The preparation method comprises the following steps: 1), a mixed solution of sebacic acid, 12-hydroxystearic acid and 30%-50% base oil is mixed and heated to 80 DEG C plus/minus 2 DEG C and stirred uniformly at a constant temperature; 2), a LiOH aqueous solution preheated to 80 DEG C plus/minus 2 DEG C is added slowly to the mixed solution, and a mixture is heated to 120 DEG C plus/minus 2 DEG C and stirred for 180 min-240 min at a constant temperature; 3), residual base oil preheated to 80 DEG C plus/minus 2 DEG C is added totally, and a mixture is heated to 120 DEG C plus/minus 2 DEG C, kept at a constant temperature for 60-70 min, and then is evaporated to dryness; 4), the mixed solution is heated rapidly to 205 DEG C plus/minus 2 DEG C, kept at a constant temperature for 10-20 min, and then cooled to 80 DEG C plus/minus 2 DEG C; 5), an ionic liquid or ionic salt is added, certain amount of other additives is added to grease and uniformly stirred, a mixture is ground on a three-roller grinding machine, and required conductive Li-based grease is obtained. The developed conductive grease composition has good corrosion resistance, anti-rust property and electrical conductivity and can meet requirements of electric transmission and transformation equipment.

Description

A kind of composition and method of making the same of conductive grease

Technical field

The present invention relates to a kind of composition and method of making the same, particularly a kind of composition and method of making the same of conductive grease.

Background technology

During modern industry is produced, lubricating grease can not run off in vertical surface attachment, and can also work at the part friction pair of poor sealing, these advantages determine that lubricating grease can be used widely in more field than lubricating oil, along with the develop rapidly of China's electric utility, new requirement is proposed to electric power lubricating grease.Electro-conductive material conventional in power engineering is mostly copper and aluminium.The conductor contact face that various etchant gas, moisture etc. can corrode connection is there is in environment due to work.So in routine work, copper and aluminium surface easily its chemical reaction cupric oxide and aluminum oxide, these novel substances can cover surface as film, and electroconductibility very poor (resistivity can reach 107-1010 Ω m).What is more important, what their meeting was steady in a long-term is adsorbed on conductive surface, eliminating these oxide compounds is very difficult things, the oxide compound of these poorly conductives is added connecting surface and was originally contacted just undesirable, this can make the mineral membrane contact resistance between contact increase further, when electric current is by contact surface, can there is the phenomenon of sharply shrinking in electric current, and can cause increases a series of accidents such as electric energy loss, connection position heating, junction generation pressure drop.In order to solve the harm that contact resistance brings, many at conductor connecting surface coating electrically conductive lubricating grease in industry, effectively can reduce contact resistance, the generation of Accident prevention.On market, many metallic elements such as silver and copper that add in lubricating grease are prepared conductive grease and are coated in conductive surface, ensure conduction of current and reduce energy consumption, but metallic element is expensive and affect PERFORMANCE OF GREASES, the present invention completes the conduction lithium soap grease utilizing ionic liquid salt to be prepared from as additive replacement metallic element.

Summary of the invention

In view of this, the invention provides a kind of composition and method of making the same of conductive grease, have good electroconductibility and antiwear characteristics, its lubrication and conductivity are higher than general commercial conductive grease.

The present invention is solved the problem by following technique means:

A composition for conductive grease, comprises the material of following weight ratio ingredient: the base oil of 25-65%, the ionic liquid of 0.5-10% or ion salt, the grease additive of 1-10%, the viscosifying agent of 30-50%.

Further, described base oil is oil soluble polyethers.

Further, described ionic liquid or ion salt are selected from any one in a tetrafluoro borate, hexafluorophosphate and two trifluoromethanesulfonimide salt.

Further, described grease additive is selected from any one in benzotriazole, 2.6-ditertbutylparacresol and thiadiazoles derivative.

Prepare a method for the composition of conductive grease described in above-described embodiment, comprise the steps:

1), the mixed solution of sebacic acid, 12-oxystearic acid and 30-50% base oil is mixed and heated to 80 ± 2 DEG C of constant temperature to stir;

2), by the LiOH aqueous solution being preheated to 80 ± 2 DEG C slowly add described mixed solution, be warming up to 120 ± 2 DEG C of constant temperature and stir 180min-240min;

3), by the remaining base oil being preheated to 80 ± 2 DEG C all add, be warming up to evaporating water after 120 ± 2 DEG C of constant temperature 60-70min; 4), by described mixed solution rapid temperature increases to 205 ± 2 DEG C constant temperature 10-20min, 80 ± 2 DEG C are cooled to;

5), add ionic liquid or ion salt, and add in a certain amount of other additive to lubricating grease and stir, and grind on three-roll grinder, obtain required conduction lithium soap grease.

The conductive grease composition of the present invention's development take lithium soap as the lubricating grease of viscosifying agent, oil based on selected oil soluble polyethers, add multiple applicable different additive, good anticorrosive and rust-preventing characteristic and electroconductibility can be possessed, meet power transmission and transforming equipment requirement.

Embodiment

With specific embodiment, the present invention will be further described below.

Embodiment 1

(1) in reaction vessel, add 2.38 ± 0.01g sebacic acid, the 12-oxystearic acid of 4.7 ± 0.05g and 4.2 ± 0.05g polyethers, stir and be warming up to 85 DEG C ± 2 DEG C.

(2) slowly added in reaction vessel by the LiOH aqueous solution (LiOH of 1.67 ± 0.01g) being preheated to 80 DEG C ± 2 DEG C, be warming up to 120 ± 2 DEG C and be incubated 180-240min, period can suitably keep the skin wet;

(3) remaining 4 ± 0.1g base oil be preheated to 90 ± 2 DEG C and add in reflection container, being again warming up to 120 ± 2 DEG C, insulation 60-70min, guarantees evaporating water;

(4) rapid temperature increases to 205 ± 2 DEG C constant temperature 10-20min;

(5) lubricating grease obtained is cooled to 80 ± 2 DEG C, be sequentially added into the LiBF4 of 0.8 ± 0.01g, stir, add 0.5 ± 0.01g2.6-ditertbutylparacresol and 0.5 ± 0.01g thiadiazoles derivative stirs, and grind 3 times on three-roll grinder, obtain required conductive grease.

The result of the rub(bing)test of product:

Adopt SRV-1 friction wear testing machine, some face contact, friction type: point-face friction, the material of ball is steel, and the material of dish is AISI52100 steel, and wherein the diameter of ball is 10mm, hardness 710HRC, and the diameter of dish is 2.4mm, height 7.8mm.Load: 400N, frequency 25Hz, temperature 25 DEG C, stroke 1mm, time: 30min.Average friction coefficient: 0.106.

Obtained product power performance index are as table 1:

Table 1 electrodynamic the performance test results

Conductivity (us/cm) volume specific resistance (Ω cm)

System is from sample No. 1 33.52.99 × 104

National grid standard is less than 1 × 10-2 and is greater than 1 × 108

Domestic sample DLZ-1A type 2.1 × 10-84.77 × 1013

Domestic sample DLZ-1G type 1.73 × 10-105.79 × 1015

Embodiment 2

(1) in reaction vessel, add 2.38 ± 0.01g sebacic acid, the 12-oxystearic acid of 4.7 ± 0.05g and 4.2g polyethers, stir and be warming up to 85 ± 2 DEG C.

(2) slowly added in reaction vessel by the LiOH aqueous solution (LiOH of 1.67 ± 0.01g) being preheated to 80 ± 2 DEG C, be warming up to 120 ± 2 DEG C and be incubated 180-240min, period can suitably keep the skin wet;

(3) remaining 4 ± 0.05g base oil be preheated to 90 ± 2 DEG C and add in reflection container, being again warming up to 120 ± 2 DEG C, insulation 60-70min, guarantees evaporating water;

(4) rapid temperature increases to 205 ± 2 DEG C constant temperature 10-20min;

(5) lubricating grease obtained is cooled to 80 ± 2 DEG C, be sequentially added into the lithium hexafluoro phosphate of 0.8 ± 0.05g, stir, add 0.5 ± 0.05g2.6-ditertbutylparacresol and 0.5 ± 0.01g Benzotriazole Derivative stirs, and grind 3 times on three-roll grinder, obtain required conductive grease.

The result of the rub(bing)test of product:

Adopt SRV-1 friction wear testing machine, some face contact, friction type: point-face friction, the material of ball is steel, and the material of dish is AISI52100 steel, and wherein the diameter of ball is 10mm, hardness 710HRC, and the diameter of dish is 2.4mm, height 7.8mm.Load: 400N, frequency 25Hz, temperature 25 DEG C, stroke 1mm, time: 30min.Average friction coefficient: 0.104.

Obtained product power performance index are as table 2:

Table 2 electrodynamic the performance test results

Conductivity (us/cm) volume specific resistance (Ω cm)

System is from sample No. 1 27.23.68 × 104

National grid standard is less than 1 × 10-2 and is greater than 1 × 108

Domestic sample DLZ-1A type 2.1 × 10-84.77 × 1013

Domestic sample DLZ-1G type 1.73 × 10-105.79 × 1015

What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (5)

1. a composition for conductive grease, is characterized in that: the base oil of the material comprising following weight ratio ingredient: 25-65%, the ionic liquid of 0.5-10% or ion salt, the grease additive of 1-10%, the viscosifying agent of 30-50%.

2. the composition of conductive grease according to claim 1, is characterized in that: described base oil is oil soluble polyethers.

3. the composition of conductive grease according to claim 1 and 2, is characterized in that: described ionic liquid or ion salt be selected from a tetrafluoro borate, hexafluorophosphate and two trifluoromethanesulfonimide salt any one.

4. the composition of conductive grease according to claim 1, is characterized in that: described grease additive be selected from benzotriazole, 2.6-ditertbutylparacresol and thiadiazoles derivative any one.

5. prepare a method for the composition of conductive grease described in claim 1, it is characterized in that, comprise the steps:

1), the mixed solution of sebacic acid, 12-oxystearic acid and 30-50% base oil is mixed and heated to 80 ± 2 DEG C of constant temperature to stir;

2), by the LiOH aqueous solution being preheated to 80 ± 2 DEG C slowly add described mixed solution, be warming up to 120 ± 2 DEG C of constant temperature and stir 180min-240min;

3), by the remaining base oil being preheated to 80 ± 2 DEG C all add, be warming up to evaporating water after 120 ± 2 DEG C of constant temperature 60-70min; 4), by described mixed solution rapid temperature increases to 205 ± 2 DEG C constant temperature 10-20min, 80 ± 2 DEG C are cooled to;

5), add ionic liquid or ion salt, and add in a certain amount of other additive to lubricating grease and stir, and grind on three-roll grinder, obtain required conduction lithium soap grease.