CN116731769A - Anti-hydrocarbon plug valve sealing grease and preparation method thereof - Google Patents

Anti-hydrocarbon plug valve sealing grease and preparation method thereof Download PDF

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Publication number
CN116731769A
CN116731769A CN202310435897.XA CN202310435897A CN116731769A CN 116731769 A CN116731769 A CN 116731769A CN 202310435897 A CN202310435897 A CN 202310435897A CN 116731769 A CN116731769 A CN 116731769A
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China
Prior art keywords
content
grease
composition
base oil
plug valve
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CN202310435897.XA
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Chinese (zh)
Inventor
汪利平
褚铭铭
程亚洲
仇建伟
冯青姣
秦俊龙
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Wuxi PetroChina Lubricating Grease Co Ltd
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Wuxi PetroChina Lubricating Grease Co Ltd
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Priority to CN202310435897.XA priority Critical patent/CN116731769A/en
Publication of CN116731769A publication Critical patent/CN116731769A/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/102—Silicates
    • C10M2201/103—Clays; Mica; Zeolites
    • C10M2201/1036—Clays; Mica; Zeolites used as thickening agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/105—Silica
    • C10M2201/1056—Silica used as thickening agents
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/022—Ethene
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/024—Propene
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    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/026—Butene
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
    • C10M2209/084—Acrylate; Methacrylate
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
    • C10M2209/1045—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only used as base material
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only
    • C10M2209/1055—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms only used as base material
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/108—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified
    • C10M2209/1085—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified used as base material
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    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl amines
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    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
    • C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
    • C10M2219/066—Thiocarbamic type compounds
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    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/045—Metal containing thio derivatives
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    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06—Organic compounds derived from inorganic acids or metal salts
    • C10M2227/061—Esters derived from boron
    • C—CHEMISTRY; METALLURGY
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
    • C—CHEMISTRY; METALLURGY
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
    • C—CHEMISTRY; METALLURGY
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/36—Seal compatibility, e.g. with rubber
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    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

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  • General Chemical & Material Sciences (AREA)
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Abstract

The invention belongs to the technical field of lubricating grease, and particularly relates to a composition of plug valve sealing lubricating grease for conveying hydrocarbon and a preparation method thereof. The composition comprises 60-85% of polyether base oil, 5-25% of thickening agent, 5-15% of adhesive and 1-5% of additive by weight of the total weight of the sealing grease composition. The thickener consists of high-purity inorganic material mica powder and silicon dioxide; the additive comprises: antioxidants, rust inhibitors, extreme pressure agents and inhibitors. The sealing grease composition replaces the traditional mineral oil with polyether base oil, and can solve the problems of grease dispersion loss, insufficient pressure resistance and sealing failure caused by easy dilution and dissolution in the use process of the sealing grease for the plug valve by utilizing the characteristic of very low solubility of the base oil and hydrocarbon gases, and is particularly suitable for equipment for conveying hydrocarbon gases such as methane, ethane, propane, ethylene, propylene and the like.

Description

Anti-hydrocarbon plug valve sealing grease and preparation method thereof
Technical Field
The invention belongs to the technical field of lubricating grease, and particularly relates to a composition of plug valve sealing lubricating grease for conveying hydrocarbon and a preparation method thereof.
Background
The valve is one of the control components of the fluid delivery system. Plug valves are valves that use a conical or cylindrical "plug" to stop or start flow as one type of valve. Is widely used in oil field mining, transportation and oil refining equipment, and industries such as petrochemical industry, natural gas, liquefied petroleum gas and the like, the working pressure can reach 150MPa, the highest working temperature can reach more than 300 ℃, and the maximum diameter can reach 600mm. In order to reduce friction between the valve body and the plug sealing surface, sealing grease is generally used for lubricating the valve seat. The sealing grease has the advantages of no solidification, no dispersion, no dissolution and good pressure resistance, and is one of key measures for reducing the abrasion of the sealing surface of the valve and prolonging the service life of the valve. The existing valve sealing lubricating grease is formed by thickening mineral oil, refined mineral oil or high-viscosity silicone oil with an inorganic thickening agent and adding a structural stabilizer, an antioxidant, an anti-corrosion and a water repellent agent, has good sealing performance, waterproof performance and anti-creepage performance, does not corrode metal, and has good compatibility with rubber. The service life and replacement of the sealing grease is usually determined by the number of times the medium and valves are opened and closed. According to different conveying mediums, reasonable valve sealing grease is selected, especially when the conveying mediums are hydrocarbon gases such as methane, ethane, propane, ethylene, propylene and the like, the sealing grease in the valve is fully contacted with the conveying mediums, so that chemical reaction is easy to occur, and the sealing grease which usually uses mineral oil as base oil can be combined with the hydrocarbon gases to generate substitution reaction, so that the adhesiveness and the tightness of the sealing grease are negatively affected, and sealing leakage and even accidents are caused in severe cases.
Disclosure of Invention
In order to solve the problems, the invention discloses a plug valve sealing grease for resisting hydrocarbon and a preparation method thereof, which replace traditional mineral oil with polyether base oil, and can solve the problems of viscosity loss, grease dispersion loss and the like caused by easy dilution and dissolution in the use process of the plug valve sealing grease by utilizing the characteristic of very low solubility of the base oil and hydrocarbon gas, and improve the lubricity and the sealing property between a valve and a valve body, thereby further improving the problems of insufficient pressure resistance and sealing failure of the traditional valve sealing grease, and effectively prolonging the working period and reducing the shutdown.
The technical scheme of the invention is as follows:
a plug valve sealing grease composition for resisting hydrocarbon comprises base oil, a thickening agent, an adhesive and an additive; the weight percentages of the components are as follows:
base oil: the content of the extract is 60-85%;
thickener: the content of the extract is 5-25%;
and (3) an adhesive: the content of the extract is 5-15%;
additive: the content of the composition is 1-5%;
wherein the additive comprises:
(a) Antioxidant with total content of 0.2-2.0%;
(b) The total content of the rust inhibitor is 0.1 to 5.0 percent;
(c) Extreme pressure agent with total content of 0.5-5.0%;
(d) The total content of polymerization inhibitor is 0.1-0.5%.
The base oil is a random polymer formed by grafting ethylene oxide groups (EO) and propylene oxide groups (PO) by taking butanol, glycol and pentaerythritol as starting points; wherein the mass percent of the polymer 1 containing 50 weight percent of ethylene oxide groups and 50 weight percent of propylene oxide groups and the mass percent of the polymer 2 containing 75 weight percent of ethylene oxide groups and 25 weight percent of propylene oxide groups is 3:1 to 1:1, a step of; the base oilThe viscosity of the product is 460-680 mm at 40 DEG C 2 And/s, the pour point is lower than-30 ℃. .
Furthermore, the anti-hydrocarbon plug valve sealing lubricating grease composition comprises a thickening agent which is formed by mixing mica powder and silicon dioxide according to different proportions by a gas phase method and a precipitation method; wherein, the mass ratio of the mica powder to the silicon dioxide is 1:1.5 to 1:3, a step of; the mass ratio of the fumed silica to the precipitated silica is 2:1 to 3:1. the high-purity inorganic mica powder and the silicon dioxide material are selected as the thickening agent, so that acid-base reaction and corrosion and erosion caused by acidic or alkaline compounds in the use process of the sealing grease can be solved, and the hardening and solidification of the grease are avoided.
Further, the sealing lubricating grease composition for the anti-hydrocarbon plug valve comprises two or more of polyisobutylene, polymethacrylate, polyethylene, polypropylene or ethylene-propylene copolymer, and the content of the adhesive is 5-15%. The adhesion force of the lubricating grease can be improved by using polyisobutylene, polymethacrylate, polyethylene, polypropylene or ethylene-propylene copolymer, so that the lubricating grease is adhered to the surface of a friction pair of a cock valve, and the lubricating and sealing performance of the lubricating grease is improved;
further, the anti-hydrocarbon plug valve sealing grease composition is a mixture of 2', 6-di-tert-butyl-p-cresol, octyl diphenylamine and dipentyl dithiocarbamate, and the content of the anti-hydrocarbon plug valve sealing grease composition is 0.2-2.0%.
Further, the anti-hydrocarbon plug valve sealing lubricating grease composition is characterized in that the rust inhibitor is a mixture of sorbitol monooleate and barium dinonyl naphthalene sulfonate, and the content of the rust inhibitor is 0.1-5.0%. The anti-oxidant, the rust inhibitor and the polymerization inhibitor are used, so that the sealing grease of the plug valve can be effectively slowed down and prevented from being solidified, dispersed and dissolved, the polymerization of unsaturated hydrocarbon monomers can be effectively prevented, and the ductility, the adhesiveness and the sealing property of the grease are ensured.
Further, the extreme pressure agent is a mixture of zinc dialkyl dithiophosphate, antimony dialkyl dithiophosphate, vanlube829, molybdenum thiocarbamate and boric acid ester, and the content is 0.5-5.0%. The mixture of zinc dialkyl dithiophosphate, antimony dialkyl dithiophosphate, vanlube829, molybdenum thiocarbamate and boric acid ester is used as an extreme pressure agent, sulfide molecules, active antimony, molybdenum and boric acid ester can be strongly adsorbed on the metal surface of a friction pair of a cock valve, and a chemical reaction film is formed under the conditions of high pressure and high temperature, so that excellent extreme pressure performance is provided.
Furthermore, the anti-hydrocarbon plug valve sealing lubricating grease composition is characterized in that the polymerization inhibitor is copper di-n-butyl dithiocarbamate, and the dosage of the polymerization inhibitor is 0.1-0.5% of the total mass of the lubricating grease.
Further, the preparation method of the hydrocarbon-resistant plug valve sealing grease composition comprises the following steps:
1) Adding 50 weight percent of ethylene oxide group and 50 weight percent of propylene oxide group-containing polymer and 75 weight percent of ethylene oxide group and 25 weight percent of propylene oxide group-containing polymer into a reaction kettle according to a specific proportion, mixing and heating to 150 ℃;
2) Adding the adhesive, stirring for 30min until the adhesive is completely dissolved, and cooling to 100 ℃;
3) Slowly adding inorganic thickening agents such as mica powder, silicon dioxide and the like, and stirring for 40-100 min until all materials are completely dispersed to form uniform paste;
4) Sequentially adding an antioxidant, an extreme pressure agent, an antirust agent and a polymerization inhibitor, and stirring for 40-100 min until all the additives are completely dispersed into the uniform paste;
5) And (3) after the temperature is reduced to 40-60 ℃, grinding for three times by a three-roller grinder, sampling, detecting to be qualified, and canning.
Furthermore, the sealing lubricating grease composition for the anti-hydrocarbon plug valve or the preparation method thereof is applied to equipment for conveying hydrocarbon gases.
Further, the hydrocarbon gas is methane, ethane, propane, ethylene and propylene. When hydrocarbon gas is conveyed, the polyether base oil can slow down substitution reaction with hydrocarbon gas such as ethylene, so that adhesiveness and tightness of sealing grease are improved, and service life and grease changing period of the plug valve are prolonged.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a plug valve sealing lubricating grease composition for resisting hydrocarbon and a preparation method thereof, which are compared with base oil, a thickening agent, an additive, a grease preparation process, physical and chemical indexes and the like, and are combined with hydrocarbon conveying mediums such as methane, ethane, propane, ethylene, propylene, chloroethylene and the like to easily perform chemical reaction with mineral base oil and an organic thickening agent. The polyether base oil is selected as the base oil of the plug valve sealing grease for resisting hydrocarbon, and the problems of grease loss and sealing failure caused by easy dilution in the use process of the plug valve sealing grease can be solved by utilizing the characteristic of very low solubility of the base oil and hydrocarbon gas; the high-purity inorganic material is selected as the thickener, and the thickener can solve the problems of acid-base reaction, corrosion erosion, high-temperature loss and hardening caused by acid-base compounds in the use process of the sealing grease; the plug valve sealing grease with hydrocarbon resistance is prepared by adding the adhesive, the antioxidant, the rust inhibitor, the extreme pressure agent, the polymerization inhibitor and the like, has excellent adhesiveness, sealing property, oxidation resistance, extreme pressure property and hydrocarbon resistance, and effectively prevents the polymerization of unsaturated hydrocarbon monomers. The plug valve can be used in petrochemical industry, chemical industry, natural gas and liquefied petroleum gas industry, and can prolong the service life and the grease changing period of the plug valve.
Drawings
FIG. 1 is a comparative graph of oxidation stability (PDSC) tests of plug valve sealing greases obtained in examples 1-3 and comparative examples 1-4;
FIG. 2 extreme pressure Property (four-ball method) P of plug valve sealing greases obtained in examples 1 to 3 and comparative examples 1 to 4 D a/N test comparison graph;
FIG. 3 is a graph showing the comparison of the friction coefficient (25 ℃ C., load 100N, frequency 5 Hz) test of plug valve sealing greases obtained in examples 1-3 and comparative examples 1-4;
FIG. 4 test comparative soil for aging test (8 cycles) of plug valve sealing grease obtained in examples 1-3 and comparative examples 1-4;
figure 5 no leakage run time comparison of plug valve sealing greases obtained in examples 1-3 and comparative examples 1-4 in ethylene transmission media equipment.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The reagents or instruments used in the examples of the present invention were not manufacturer-identified and were conventional reagent products commercially available.
Example 1
The plug valve sealing grease comprises the following components in percentage by mass based on 100% of the anti-hydrocarbon plug valve sealing grease:
base oil: the content is 65%; is a random polymer formed by grafting ethylene oxide groups (EO) and propylene oxide groups (PO) and takes pentaerythritol as a starting point, and consists of a polymer 1 containing 50 weight percent of ethylene oxide groups and 50 weight percent of propylene oxide groups and a polymer 2 containing 75 weight percent of ethylene oxide groups and 25 weight percent of propylene oxide groups, wherein the mass ratio of the two is 2:1, the viscosity of the mixture at 40 ℃ is 460-680 mm 2 And/s, the pour point is lower than-30 ℃.
Thickener: the content is 15%; the thickening agent consists of mica powder and silicon dioxide prepared by a gas phase method and a precipitation method according to different proportions; wherein, the mass ratio of the mica powder to the silicon dioxide is 1:2; the mass ratio of the fumed silica to the precipitated silica is 2:1, a step of;
and (3) an adhesive: the content is 15%; the adhesive consists of polyisobutene and polymethacrylate, wherein the mass ratio of the polyisobutene to the polymethacrylate is 1:2;
additive: the content is 5%; comprising the following steps:
(a) The antioxidant content is 0.8%, the components are a mixture of 2', 6-di-tert-butyl-p-cresol and dipentyl dithiocarbamic acid ester, and the mass ratio is 1:1, a step of;
(b) The rust inhibitor contains 2.5% of rust inhibitor, the components are a mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705), and the preferable mass ratio of the mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705) is 2:1, a step of;
(c) The extreme pressure agent contains 1.4% of the components of the mixture of zinc dialkyl dithiophosphate, vanlube829 and molybdenum thiocarbamate. The mass ratio of the mixture of the dialkyl dithiophosphate, the Vanlube829 and the molybdenum thiocarbamate is 1:2:1, a step of;
(d) The polymerization inhibitor content is 0.3%, and the component is copper di-n-butyl dithiocarbamate.
After the raw materials are prepared, the plug valve sealing grease for resisting hydrocarbon can be prepared according to the following preparation method, and the sample number A is obtained.
The preparation method comprises the following steps: adding base oil into a reaction kettle, mixing and heating to 150 ℃, adding an adhesive, stirring for 30min to clear liquid, and cooling to 100 ℃; slowly adding inorganic thickening agents such as mica powder, silicon dioxide and the like, and stirring for 40-100 min until all materials are completely dispersed to form uniform paste; sequentially adding an antioxidant, an extreme pressure agent, an antirust agent and a polymerization inhibitor, and stirring for 40-100 min until all the additives are completely dispersed into the uniform paste; when the temperature is reduced to 40-60 ℃, grinding for three times by a three-roller grinder, sampling and detecting, and packaging after passing the inspection.
Example 2
The plug valve sealing grease comprises the following components in percentage by weight based on 100% of the anti-hydrocarbon plug valve sealing grease:
base oil: the content is 70%; is a random polymer composed of ethylene oxide group (EO) and propylene oxide group (PO) grafted by using hexanediol as starting point, and consists of polymer 1 containing 50% by weight of ethylene oxide group and 50% by weight of propylene oxide group and polymer 1 containing 75% by weight of ethylene oxide group and 25% by weight of propylene oxide groupThe polymer 2 with the epoxypropyl group comprises the following components in percentage by mass of 2.5:1, the viscosity of the mixture at 40 ℃ is 460-680 mm 2 And/s, the pour point is lower than-30 ℃.
Thickener: the content is 17%; the thickening agent consists of mica powder and silicon dioxide prepared by a gas phase method and a precipitation method according to different proportions. Wherein, the mass ratio of the mica powder to the silicon dioxide is 1:1.5; the mass ratio of the fumed silica to the precipitated silica is 2.5:1, a step of;
and (3) an adhesive: the content is 8 percent; the polypropylene is prepared by mixing polyisobutylene and polypropylene, wherein the mass ratio of the polyisobutylene to the polypropylene is 2:1, a step of;
additive: the content is 5%; comprising the following steps:
(a) The antioxidant content is 1.2%, the components are a mixture of 2 '6-di-tert-butyl-p-cresol, octyl diphenylamine and dipentyl dithiocarbamic acid ester, and the mass ratio of the 2' 6-di-tert-butyl-p-cresol to the octyl diphenylamine is 2:1, a step of;
(b) The rust inhibitor contains 2.0% of rust inhibitor, the components are a mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705), and the preferable mass ratio of the mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705) is 1:1, a step of;
(c) The extreme pressure agent content is 1.5%, and the components are a mixture of dialkyl antimony dithiophosphate and molybdenum thiocarbamate. The mass ratio of the mixture of the dialkyl dithiophosphate and the molybdenum thiocarbamate is 2:1, a step of;
(d) The polymerization inhibitor content is 0.3%, and the component is copper di-n-butyl dithiocarbamate.
After preparing the raw materials, the preparation method of the example 1 can prepare the anti-hydrocarbon plug valve sealing grease.
Example 3
The plug valve sealing grease comprises the following components in percentage by mass based on 100% of the anti-hydrocarbon plug valve sealing grease:
base oil: the content is 75 percent; is a random polymer composed of ethylene oxide groups (EO) and propylene oxide groups (PO) grafted by using hexanediol as a starting point, and comprises 50% by weight of ethylene oxide groups and 50% by weight of ethylene oxide groupsThe mass ratio of the polymer 1 containing the ethylene oxide groups with 75 percent by weight to the polymer 2 containing the propylene oxide groups with 25 percent by weight is 1:1, the viscosity of the mixture at 40 ℃ is 460-680 mm 2 And/s, the pour point is lower than-30 ℃.
Thickener: the content is 13%; the thickening agent consists of mica powder and silicon dioxide prepared by a gas phase method and a precipitation method according to different proportions. Wherein, the mass ratio of the mica powder to the silicon dioxide is 1:2.5; the mass ratio of the fumed silica to the precipitated silica is 3:1, a step of;
and (3) an adhesive: the content is 7%; the adhesive consists of polyisobutylene, polymethacrylate and ethylene-propylene copolymer in the mass ratio of 2:1:1, a step of;
additive: the content is 5%; comprising the following steps:
(a) The antioxidant content is 0.5%, the components are a mixture of 2 '6-di-tert-butyl-p-cresol, octyl diphenylamine and dipentyl dithiocarbamic acid ester, and the mass ratio of the 2' 6-di-tert-butyl-p-cresol, the octyl diphenylamine and the dipentyl dithiocarbamic acid ester is 1:1:1, a step of;
(b) The rust inhibitor contains 2.0% of rust inhibitor, the components are a mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705), and the preferable mass ratio of the mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705) is 2:1, a step of;
(c) The extreme pressure agent contains 2.1 percent of components of zinc dialkyl dithiophosphate, antimony dialkyl dithiophosphate, vanlube829, molybdenum thiocarbamate and borate, and the mass ratio is 1:1:2:1, a step of; (d) The polymerization inhibitor content is 0.4%, and the component is copper di-n-butyl dithiocarbamate.
Comparative example 1
The plug valve sealing grease comprises the following components in percentage by weight based on 100% of the anti-hydrocarbon plug valve sealing grease:
base oil: the content is 70%; the base oil is K30 naphthenic oil and mineral oil. (Xinjiang oilfield K30 naphthenic oil, base-filled mineral oil).
Thickener: the content is 17%; the thickening agent consists of mica powder and silicon dioxide prepared by a gas phase method and a precipitation method according to different proportions. Wherein, the mass ratio of the mica powder to the silicon dioxide is 1:1.5; the mass ratio of the fumed silica to the precipitated silica is 2.5:1, a step of;
and (3) an adhesive: the content is 8 percent; the polypropylene is prepared by mixing polyisobutylene and polypropylene, wherein the mass ratio of the polyisobutylene to the polypropylene is 2:1, a step of;
additive: the content is 5%; comprising the following steps:
(a) The antioxidant content is 1.2%, the components are a mixture of 2 '6-di-tert-butyl-p-cresol, octyl diphenylamine and dipentyl dithiocarbamic acid ester, and the mass ratio of the 2' 6-di-tert-butyl-p-cresol to the octyl diphenylamine is 2:1, a step of;
(b) The rust inhibitor contains 2.0% of rust inhibitor, the components are a mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705), and the preferable mass ratio of the mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705) is 1:1, a step of;
(c) The extreme pressure agent content is 1.5%, and the components are a mixture of dialkyl antimony dithiophosphate and molybdenum thiocarbamate. The mass ratio of the mixture of the dialkyl dithiophosphate and the molybdenum thiocarbamate is 2:1, a step of;
(d) The polymerization inhibitor content is 0.3%, and the component is copper di-n-butyl dithiocarbamate.
The preparation method comprises the following steps: adding K30 naphthenic oil into a reaction kettle, heating to 150 ℃, adding an adhesive, stirring for 30min to clear liquid, and cooling to 100 ℃; slowly adding inorganic thickening agents such as mica powder, silicon dioxide and the like, and stirring for 40-100 min until all materials are completely dispersed to form uniform paste; sequentially adding an antioxidant, an extreme pressure agent, an antirust agent and a polymerization inhibitor, and stirring for 40-100 min until all the additives are completely dispersed into the uniform paste; when the temperature is reduced to 40-60 ℃, grinding for three times by a three-roller grinder, sampling and detecting, and packaging after passing the inspection.
Comparative example 2
The plug valve sealing grease comprises the following components in percentage by weight based on 100% of the anti-hydrocarbon plug valve sealing grease:
base oil: the content is 70%; the base oil is formed by polymerizing butanol and 100 weight percent of ethylene oxide.
Thickener: the content is 17%; the thickening agent consists of mica powder and silicon dioxide prepared by a gas phase method and a precipitation method according to different proportions. Wherein, the mass ratio of the mica powder to the silicon dioxide is 1:1.5; the mass ratio of the fumed silica to the precipitated silica is 2.5:1, a step of;
and (3) an adhesive: the content is 8 percent; the polypropylene is prepared by mixing polyisobutylene and polypropylene, wherein the mass ratio of the polyisobutylene to the polypropylene is 2:1, a step of;
additive: the content is 5%; comprising the following steps:
(a) The antioxidant content is 1.2%, the components are a mixture of 2 '6-di-tert-butyl-p-cresol, octyl diphenylamine and dipentyl dithiocarbamic acid ester, and the mass ratio of the 2' 6-di-tert-butyl-p-cresol to the octyl diphenylamine is 2:1, a step of;
(b) The rust inhibitor contains 2.0% of rust inhibitor, the components are a mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705), and the preferable mass ratio of the mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705) is 1:1, a step of;
(c) The extreme pressure agent content is 1.5%, and the components are a mixture of dialkyl antimony dithiophosphate and molybdenum thiocarbamate. The mass ratio of the mixture of the dialkyl dithiophosphate and the molybdenum thiocarbamate is 2:1, a step of;
(d) The polymerization inhibitor content is 0.3%, and the component is copper di-n-butyl dithiocarbamate.
After preparing the raw materials, the preparation method of the example 1 can prepare the anti-hydrocarbon plug valve sealing grease.
Comparative example 3
The plug valve sealing grease comprises the following components in percentage by weight based on 100% of the anti-hydrocarbon plug valve sealing grease:
base oil: the content is 70%; the base oil was prepared by polymerizing butanol with 75 weight percent ethylene oxide groups and 25 weight percent propylene oxide groups.
Thickener: the content is 17%; the thickening agent consists of mica powder and silicon dioxide prepared by a gas phase method and a precipitation method according to different proportions. Wherein, the mass ratio of the mica powder to the silicon dioxide is 1:1.5; the mass ratio of the fumed silica to the precipitated silica is 2.5:1, a step of;
and (3) an adhesive: the content is 8 percent; the polypropylene is prepared by mixing polyisobutylene and polypropylene, wherein the mass ratio of the polyisobutylene to the polypropylene is 2:1, a step of;
additive: the content is 5%; comprising the following steps:
(a) The antioxidant content is 1.2%, the components are a mixture of 2 '6-di-tert-butyl-p-cresol, octyl diphenylamine and dipentyl dithiocarbamic acid ester, and the mass ratio of the 2' 6-di-tert-butyl-p-cresol to the octyl diphenylamine is 2:1, a step of;
(b) The rust inhibitor contains 2.0% of rust inhibitor, the components are a mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705), and the preferable mass ratio of the mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate (T705) is 1:1, a step of;
(c) The extreme pressure agent content is 1.5%, and the components are a mixture of dialkyl antimony dithiophosphate and molybdenum thiocarbamate. The mass ratio of the mixture of the dialkyl dithiophosphate and the molybdenum thiocarbamate is 2:1, a step of;
(d) The polymerization inhibitor content is 0.3%, and the component is copper di-n-butyl dithiocarbamate.
After preparing the raw materials, the preparation method of the example 1 can prepare the anti-hydrocarbon plug valve sealing grease.
Comparative example 4
Some company in southwest is sealing grease with plug valves.
Test example 1
The plug valve sealing greases obtained in examples 1 to 3 and comparative examples 1 to 4 were subjected to performance test, and the results are shown in tables 1 to 2 and in FIGS. 1 to 4.
Table 1 analysis test data comparison
Table 2 analysis test data comparison (follow-up)
As can be seen from the data of tables 1 and 2 and fig. 1 to 4, examples 1 to 3 using polyether base oils instead of conventional mineral oils were excellent in corrosion resistance, oxidation stability, extreme pressure property, high temperature stability, low temperature property and aging resistance, and there was a considerable improvement in performance as compared with comparative examples 1 and 4 using conventional mineral oils, while the dispersion quality ratio of examples 2 and butanol to base oils polymerized only with ethylene oxide groups was optimized to comparative example 2 in which butanol was polymerized to base oils polymerized only with ethylene oxide groups and 25% by weight of propylene oxide groups was found to be excellent in non-dissolution resistance, and in particular, the dispersion quality ratio of graft ethylene oxide groups (EO) to propylene oxide groups (PO) was not optimized to be excellent in sealing performance, when the polyether base oils were random polymers starting from hexanediol and were composed of 50% by weight of ethylene oxide groups and 50% by weight of propylene oxide groups to 75% by weight of propylene oxide groups.
Test example 2
1 sealing grease for plug valves obtained in the above examples 1-3 and comparative examples 1-4 was subjected to a hermetic seal test on PR1 PSL3 PU plug valves conforming to the API standard, the valves were subjected to grease injection by applying a sealing grease after cleaning, the sealing grease was sufficiently adsorbed on the sealing surfaces by rotating the valve cores, the temperature was 25℃and the pressure was stabilized for 30 minutes under a pressure of 70MPa to 100MPa, and the pressurization and pressure stabilization cycles were repeated 50 times after the pressure was released, with the results shown in Table 3 below.
Table 3 air seal test
2. The plug valve sealing grease obtained in examples 1-3 and comparative examples 1-4 was applied to plug valves of a company in southwest, the transport medium was ethylene, the cumulative application time was about 1000 hours (single valve single time 480 hours), the working condition of the plug valves was stable, the lubrication state of the equipment was good, the sealing requirement was met, no leakage occurred, and the results are shown in table 4 and fig. 5.
Table 4 plug valve sealing grease application in ethylene transmission media equipment.
The above examples are summarized: the components of the sealing lubricating grease composition disclosed by the invention replace traditional mineral oil with polyether base oil, and the problems of lubricating grease loss, pressure resistance and sealing failure caused by easy dilution and dissolution in the use process of the sealing lubricating grease for plug valves can be solved by utilizing the characteristic of very low solubility of the base oil and hydrocarbon gas; the high-purity inorganic mica powder and the silicon dioxide material are selected as the thickening agent, so that the problems of acid-base reaction, corrosion erosion, high-temperature loss, solidification and hardening caused by acidic or alkaline compounds in the use process of the sealing grease can be solved; the plug valve sealing grease prepared by adding the adhesive, the antioxidant, the rust inhibitor, the extreme pressure agent, the polymerization inhibitor and the like has excellent non-solidification, non-dispersion, non-dissolution, good pressure resistance, good sealing property and hydrocarbon reactivity resistance, can effectively prevent the polymerization of unsaturated hydrocarbon monomers, ensures the ductility, the adhesiveness and the sealing property of the grease, and prolongs the service life and the grease changing period of the plug valve.
The foregoing is a description of only a limited number of preferred embodiments of the invention, which are described in greater detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.

Claims (10)

1. A plug valve sealing grease composition for resisting hydrocarbon comprises base oil, a thickening agent, an adhesive and an additive; the composite material is characterized by comprising the following components in percentage by mass:
base oil: the content of the extract is 60-85%;
thickener: the content of the extract is 5-25%;
and (3) an adhesive: the content of the extract is 5-15%;
additive: the content of the composition is 1-5%;
wherein the additive comprises:
(a) Antioxidant with total content of 0.2-2.0%;
(b) The total content of the rust inhibitor is 0.1 to 5.0 percent;
(c) Extreme pressure agent with total content of 0.5-5.0%;
(d) Polymerization inhibitor with total content of 0.1-0.5%;
the base oil is a random polymer formed by grafting ethylene oxide groups EO and propylene oxide groups PO by taking butanol, glycol and pentaerythritol as starting points; wherein the mass percent of the polymer 1 containing 50 weight percent of ethylene oxide groups and 50 weight percent of propylene oxide groups and the mass percent of the polymer 2 containing 75 weight percent of ethylene oxide groups and 25 weight percent of propylene oxide groups is 3:1 to 1:1, a step of; the viscosity of the base oil at 40 ℃ is 460-680 mm 2 And/s, the pour point is lower than-30 ℃.
2. The composition according to claim 1, wherein the thickener is composed of a mixture of mica powder and silica according to different proportions by a gas phase method and a precipitation method; wherein, the mass ratio of the mica powder to the silicon dioxide is 1:1.5 to 1:3, a step of; the mass ratio of the fumed silica to the precipitated silica is 2:1 to 3:1.
3. the composition according to claim 1, wherein the adhesive consists of two or more of polyisobutylene, polymethacrylate, polyethylene, polypropylene or ethylene-propylene copolymer in an amount of 5 to 15%.
4. The composition of claim 1, wherein the antioxidant is a mixture of 2', 6-di-tert-butyl-p-cresol, octyl diphenylamine and dipentyl dithiocarbamate, and the content is 0.2-2.0%.
5. The composition of claim 1, wherein the rust inhibitor is a mixture of sorbitol monooleate and barium dinonylnaphthalene sulfonate in an amount of 0.1 to 5.0%.
6. The composition of claim 1, wherein the extreme pressure agent is a mixture of zinc dialkyldithiophosphate, antimony dialkyldithiophosphate, vanlube829, molybdenum thiocarbamate and borate in an amount of 0.5 to 5.0%.
7. The composition according to claim 1, wherein the polymerization inhibitor is copper di-n-butyldithiocarbamate in an amount of 0.1 to 0.5% by weight of the total weight of the grease.
8. A method of preparing a composition according to any one of claims 1 to 7, comprising the steps of:
1) Adding polyether compounds obtained by homopolymerizing ethylene oxide and propylene oxide into a reaction kettle, and mixing and heating to 150 ℃;
2) Adding the adhesive, stirring for 30min until the adhesive is completely dissolved, and cooling to 100 ℃;
3) Slowly adding inorganic thickening agents such as mica powder, silicon dioxide and the like, and stirring for 40-100 min until all materials are completely dispersed to form uniform paste;
4) Sequentially adding an antioxidant, an extreme pressure agent, an antirust agent and a polymerization inhibitor, and stirring for 40-100 min until all the additives are completely dispersed into the uniform paste;
5) And (3) after the temperature is reduced to 40-60 ℃, grinding for three times by a three-roller grinder, sampling, detecting to be qualified, and canning.
9. Use of a composition according to any one of claims 1 to 7 in a device for delivering a hydrocarbon gaseous medium.
10. The use according to claim 9, wherein the hydrocarbon gases are methane, ethane, propane, ethylene and propylene.
CN202310435897.XA 2023-04-22 2023-04-22 Anti-hydrocarbon plug valve sealing grease and preparation method thereof Pending CN116731769A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000087060A (en) * 1998-07-16 2000-03-28 Asahi Denka Kogyo Kk Polyether-based lubricating base oil
CN101063061A (en) * 2006-04-28 2007-10-31 中国石油化工股份有限公司 Nano thickened agent lubricant grease and preparation method thereof
US20120115763A1 (en) * 2009-12-30 2012-05-10 Exxonmobil Research And Engineering Company Lubricant compositions based on block copolymers and processes for makin
CN106867633A (en) * 2016-12-27 2017-06-20 中国石油化工股份有限公司 A kind of high-speed railway axle box double-row conical bearing lubricant composition and preparation method
JP2018076457A (en) * 2016-11-10 2018-05-17 三洋化成工業株式会社 Lubricating grease composition
JP2018154818A (en) * 2017-03-16 2018-10-04 日本グリース株式会社 Grease composition

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000087060A (en) * 1998-07-16 2000-03-28 Asahi Denka Kogyo Kk Polyether-based lubricating base oil
CN101063061A (en) * 2006-04-28 2007-10-31 中国石油化工股份有限公司 Nano thickened agent lubricant grease and preparation method thereof
US20120115763A1 (en) * 2009-12-30 2012-05-10 Exxonmobil Research And Engineering Company Lubricant compositions based on block copolymers and processes for makin
JP2018076457A (en) * 2016-11-10 2018-05-17 三洋化成工業株式会社 Lubricating grease composition
CN106867633A (en) * 2016-12-27 2017-06-20 中国石油化工股份有限公司 A kind of high-speed railway axle box double-row conical bearing lubricant composition and preparation method
JP2018154818A (en) * 2017-03-16 2018-10-04 日本グリース株式会社 Grease composition

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