CN114591776A - Sealing grease for shield machine and preparation method thereof - Google Patents
Sealing grease for shield machine and preparation method thereof Download PDFInfo
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- CN114591776A CN114591776A CN202210247767.9A CN202210247767A CN114591776A CN 114591776 A CN114591776 A CN 114591776A CN 202210247767 A CN202210247767 A CN 202210247767A CN 114591776 A CN114591776 A CN 114591776A
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- 239000004519 grease Substances 0.000 title claims abstract description 52
- 238000007789 sealing Methods 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000002199 base oil Substances 0.000 claims abstract description 84
- 239000003607 modifier Substances 0.000 claims abstract description 19
- 239000002562 thickening agent Substances 0.000 claims abstract description 19
- 230000005641 tunneling Effects 0.000 claims abstract description 17
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 8
- -1 isobutene thioether Chemical class 0.000 claims abstract description 6
- 239000005711 Benzoic acid Substances 0.000 claims abstract description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 5
- 235000010233 benzoic acid Nutrition 0.000 claims abstract description 5
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims abstract description 5
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 67
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 51
- 229910002804 graphite Inorganic materials 0.000 claims description 42
- 239000010439 graphite Substances 0.000 claims description 42
- 239000000203 mixture Substances 0.000 claims description 36
- 229910021389 graphene Inorganic materials 0.000 claims description 28
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 claims description 20
- 235000021355 Stearic acid Nutrition 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 18
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 18
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 18
- 239000008117 stearic acid Substances 0.000 claims description 18
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 14
- 239000010936 titanium Substances 0.000 claims description 14
- 229910052719 titanium Inorganic materials 0.000 claims description 14
- 239000012043 crude product Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 11
- 239000000047 product Substances 0.000 claims description 8
- 239000000344 soap Substances 0.000 claims description 8
- 239000012153 distilled water Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- VQTUBCCKSQIDNK-UHFFFAOYSA-N iso-butene Natural products CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 231100000167 toxic agent Toxicity 0.000 abstract description 3
- 239000003440 toxic substance Substances 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 10
- 239000010959 steel Substances 0.000 description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000004408 titanium dioxide Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 231100000241 scar Toxicity 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Images
Classifications
-
- 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
- C10M2201/04—Elements
- C10M2201/041—Carbon; Graphite; Carbon black
-
- 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
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/102—Aliphatic fractions
- C10M2203/1025—Aliphatic fractions used as base material
-
- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
-
- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
-
- 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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
- C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
-
- 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
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/12—Polysaccharides, e.g. cellulose, biopolymers
- C10M2209/126—Polysaccharides, e.g. cellulose, biopolymers used as thickening agents
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- 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
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- 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
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/64—Environmental friendly compositions
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Semi-solids; greasy
Abstract
The invention provides a sealing grease for a shield tunneling machine, which belongs to the technical field of shield tail sealing grease and comprises the following raw materials in parts by weight: 80-90 parts of base oil; 10-20 parts of a thickening agent; 0.1-3 parts of a modifier; the thickener does not contain one or more of benzoic acid and lithium-based grease; the modifier does not contain one or more of nano-cerium dioxide and isobutene thioether. The sealing grease for the shield machine provided by the invention has the characteristics of good antifriction property, good wear resistance, high dropping point and environmental friendliness. The raw materials used by the environment-friendly sealing grease for the shield machine are all degradable, and no toxic substance is generated in the production and use processes. The invention provides a preparation method of sealing grease for a shield tunneling machine.
Description
Technical Field
The invention belongs to the technical field of shield tail sealing grease, and particularly relates to sealing grease for a shield tunneling machine and a preparation method thereof.
Background
In recent years, the traffic business of China is rapidly developed, and the utilization of the ground space obtains great results. However, the space for traffic on the ground is limited, and the underground space is more and more developed to meet the demand of city construction and development. The main equipment for excavating the underground tunnel is a shield machine, and the shield method tunnel construction technology is widely applied and popularized. When the shield tunneling machine works, because the shield tail and the installed pipe piece slide relatively, and a gap exists between the outer wall of the pipe piece and the shield shell, in order to prevent sand, underground water, slurry and the like outside the shield shell from entering the shield tunneling machine, sealing treatment must be carried out between the pipe piece and the shield tail. Most shield machines adopt a steel wire brush type shield tail, sealing grease is injected between shield tail steel wire brushes through a grease injection system when the shield machine tunnels, and the extrusion force of the grease is used for filling the gap between the inside of the steel wire brushes and the gap between the steel wire brushes, so that the sealing capacity of the steel wire brushes is enhanced, slurry synchronously injected from the rear is prevented from leaking from the gap between the duct piece and the shield machine shell, and meanwhile, the infiltration of sand, underground water, mud and the like can be prevented. The shield tail sealing grease has good hydraulic pressure sealing performance and lubricating performance, good pumping performance and adhesion, and has the effects of corrosion resistance and abrasion reduction on the shield tail, so that the working efficiency of the shield is improved more effectively, and the construction quality of the shield is ensured. The shield tail sealing grease can contact with underground water and soil in the using process, the leaked part can exist underground for a long time, the grease used in the prior art can not be degraded basically when entering the nature, has toxicity to the soil and the underground water, and is not friendly to the environment.
Therefore, the shield tail sealing grease must have good water pressure resistance, pumpability, adhesiveness and environmental friendliness, and the wear resistance of the shield tail sealing grease manufactured in China at present needs to be further improved.
Disclosure of Invention
The invention aims to provide sealing grease for a shield tunneling machine and a preparation method thereof, and aims to solve the technical problem that the wear resistance needs to be improved in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the sealing grease for the shield machine comprises the following raw materials in parts by weight:
80-90 parts of base oil;
10-20 parts of a thickening agent; the thickener does not contain one or more of benzoic acid, lithium-based greases; the thickening agent is one or more of glycol, stearic acid composite titanium soap, fiber and mica sheet;
0.1-3 parts of a modifier; the modifier does not comprise one or more of nano-ceria, isobutylene thioether.
Preferably, the base oil is one or more of 140BS base oil, 150BS base oil, 160BS base oil, 340SN base oil, 350SN base oil, 360SN base oil.
Preferably, the modifier is one or more of graphene and nano graphite.
Preferably, the thickening agent is a mixture of ethylene glycol, stearic acid complex titanium soap and natural fibers.
Preferably, the feed comprises the following raw materials in parts by mass:
85 parts of base oil;
14 parts of a thickening agent;
0.3 part of graphene;
0.5 part of nano graphite.
The invention also provides a preparation method of the sealing grease for the shield tunneling machine, which comprises the following steps:
step 1, adding a mixture of ethylene glycol, stearic acid, titanium isopropoxide, natural fibers and mica sheets into mixed base oil, heating to 70-90 ℃, and keeping constant for 0.6-1.5 hours;
step 2, adding distilled water, and then gradually heating the mixture to 210-240 ℃;
step 3, preparing a mixture of the modifier and the base oil;
step 4, adding the mixture prepared in the step 3 into the product obtained in the step 2;
step 5, cooling the mixture prepared in the step 4 to room temperature, and stopping stirring to obtain a crude product;
and 6, homogenizing the crude product to obtain a refined product.
Preferably, the blended base oil is a blend of 150BS base oil, 350SN base oil, wherein 150BS base oil: the mass part ratio of the 350SN base oil is 1: 4.
Preferably, the preparation of the modifier base oil comprises the steps of: weighing graphene and nano graphite according to a proportion; and then ultrasonically dispersing the graphene and the nano graphite in the base oil for 20-40 min.
Preferably, the diameter size of the nano graphite is 2 mm; the mass portion of the nano graphite is 0.8 portion.
The sealing grease for the shield tunneling machine and the preparation method thereof provided by the invention have the beneficial effects that: compared with the prior art, the environment-friendly sealing grease for the shield machine and the preparation method thereof have the characteristics of good friction reduction, good wear resistance, high dropping point and environmental friendliness. The raw materials used by the environment-friendly sealing grease for the shield machine are all degradable, and no toxic substance is generated in the production and use processes.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sealing grease for a shield tunneling machine and a preparation method thereof according to an embodiment of the present invention;
fig. 2 is a plot of drop point temperature change for different grease samples from example one to example eight;
FIG. 3 is an SEM topography illustrating a 60 minute lubrication wear scar for a grease sample at 598N;
fig. 4 is an SEM topography of a 60 minute lubrication wear scar at 598N for an example five grease sample.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4, a description will now be given of a sealing grease for a shield tunneling machine according to the present invention. The sealing grease for the shield machine comprises the following raw materials in parts by weight: 80-90 parts of base oil; 10-20 parts of a thickening agent; 0.1-3 parts of a modifier; the thickener does not contain one or more of benzoic acid and lithium-based grease; the modifier does not contain one or more of nano-cerium dioxide and isobutene thioether. The thickener is one or more of ethylene glycol, stearic acid composite titanium soap and fiber.
In some embodiments, the base oil is one or more of a 140BS base oil, a 150BS base oil, a 160BS base oil, a 340SN base oil, a 350SN base oil, a 360SN base oil. More specifically, 150BS base oil: 350SN base oil.
In some embodiments, the modifier is one or more of graphene, nanographite. More specifically, the modifier is a mixture of graphene and nano-graphite. The graphene and the nano graphite particles can be more easily uniformly and stably dispersed in the lubricating grease. The contained graphene is deposited on the wearing surface by forming a protective film, and the nano graphite is physically deposited on the wearing surface, so that the tribological performance is improved. The nano graphite is a wear-resistant film consisting of titanium dioxide and ferroferric carbide due to the supplement effects of interlayer sliding and tribochemical reaction.
In some embodiments, the thickener is a mixture of ethylene glycol, stearic acid complex titanium soap, natural fibers. The thickening agent does not adopt reagents such as benzoic acid and the like which are harmful to the environment, and adopts the reagents such as ethylene glycol and natural fiber which are friendly to the environment, thereby ensuring that the thickening agent is also very friendly to the environment while being modified.
The titanium composite lubricating grease prepared from the stearic acid composite titanium soap is a promising lubricating grease with excellent comprehensive properties, such as high drop point, good wear resistance, good bearing capacity, low pollution and good compatibility with a matching surface. In addition, compared with lithium-based grease, the titanium complex grease has wider application temperature range and better abrasion resistance.
Compared with the existing titanium composite grease modified by using nano cerium dioxide and isobutene thioether, the titanium composite grease modified by using nano graphite has the advantages that isobutene thioether is harmful to the environment, nano graphite is more friendly to the environment, and the improved titanium composite grease has more excellent performance.
The invention provides a sealing grease for a shield tunneling machine, which comprises the following raw materials in parts by weight: 85 parts of base oil; 14 parts of a thickening agent; 0.3 part of graphene; 0.8 part of nano graphite. More specifically, 150BS base oil: the 350SN base oil comprises 17 parts by mass: 68 parts of (b); the mass parts of the ethylene glycol, the stearic acid composite titanium soap and the natural fiber are respectively 2 parts, 5 parts and 7 parts.
Compared with the prior art, the environment-friendly sealing grease for the shield machine has the characteristics of good antifriction property, good wear resistance, high dropping point and environmental friendliness. The raw materials used by the environment-friendly sealing grease for the shield machine are all degradable, and no toxic substance is generated in the production and use processes.
The invention provides a preparation method of sealing grease for a shield machine, which is shown in figures 1 to 4 and comprises the following steps:
s1, adding a mixture of ethylene glycol, stearic acid, titanium isopropoxide and natural fibers into the mixed base oil, heating to 70-90 ℃, and keeping the temperature constant for 0.6-1.5 h; the mixed base oil is a mixture of 150BS base oil and 350SN base oil, wherein the ratio of 150BS base oil: the mass part ratio of the 350SN base oil is 1: 4; the mass parts of the ethylene glycol, the stearic acid, the titanium isopropoxide and the natural fiber are respectively 2 parts, 1.67 parts, 3.33 parts and 7 parts.
S2, adding distilled water, and gradually heating the mixture to 210-240 ℃;
s3, preparing a mixture of the modifier and the base oil; specifically, graphene and nano graphite are weighed in proportion; and then ultrasonically dispersing the graphene and the nano graphite in the base oil for 20-40 min. The diameter size of the nano graphite is 2 mm; the mass portion of the nano graphite is 0.8 portion.
S4, adding the mixture obtained in the step S3 into the product obtained in the step S2;
s5, cooling the mixture prepared in the step S4 to room temperature, and stopping stirring to obtain a crude product;
s6, homogenizing the crude product to obtain a refined product.
The titanium compound molecules are adsorbed on the surface of the steel base material to form a boundary film, so that the surface of the steel base material is protected. The nano graphite and the graphene are absorbed by the surface of the steel substrate, so that the strength of the boundary film is improved. In the using process, the titanium composite molecules are decomposed under the conditions of high temperature and friction to generate titanium dioxide, and the titanium dioxide is deposited on the surface of the steel substrate to improve the wear resistance. And (3) generating a ferroferric carbide carburization layer by the nano graphite and the graphene and iron atoms in the steel substrate under the conditions of high temperature and friction. The wear resistance is improved by the titanium dioxide and the ferroferric carbide carburization layer together.
Example 1
Experimental Material
150BS base oil, 350SN base oil, graphene, nano graphite, ethylene glycol, stearic acid, titanium isopropoxide, natural fibers and distilled water
The mass part ratio of 150BS base oil to 350SN base oil is 1: and 4, mixing the two to obtain the mixed base oil. The kinematic viscosity of the mixing base is 100-116mm2/s。
All reagents and additives were analytical grade and used without further purification.
Experimental procedure
Step one, adding a mixture of ethylene glycol, stearic acid, titanium isopropoxide and natural fibers into mixed base oil, mechanically stirring the mixture (the stirring speed is 35rpm, and the stirring power is 30), heating to 80 ℃, and keeping constant for 1 h.
Wherein, mixed base oil is the mixture of 150BS base oil, 350SN base oil, wherein, 150BS base oil: the mass part ratio of the 350SN base oil is 1: 4;
the mass parts of the ethylene glycol, the stearic acid, the titanium isopropoxide and the natural fiber are respectively 2 parts, 1.67 parts, 3.33 parts and 7 parts.
Step two, adding 10 parts of distilled water, and then gradually heating the mixture to 210-240 ℃; the specific temperature is 225 ℃.
And step three, cooling the mixture to room temperature, and then stopping heating and stirring to obtain a crude product.
And step four, homogenizing the crude product to obtain a refined product. The crude product was homogenized 5 times using a three-roll mill.
Example two
Experimental Material
150BS base oil, 350SN base oil, graphene, nano graphite, ethylene glycol, stearic acid, titanium isopropoxide, natural fibers and distilled water
The mass part ratio of 150BS base oil to 350SN base oil is 1: and 4, mixing the two to obtain the mixed base oil. The kinematic viscosity of the mixing base was 100-116mm 2/s.
All reagents and additives were analytical grade and used without further purification.
Experimental procedure
Step one, adding a mixture of ethylene glycol, stearic acid, titanium isopropoxide and natural fibers into mixed base oil, mechanically stirring the mixture (the stirring speed is 35rpm, and the stirring power is 30), heating to 80 ℃, and keeping constant for 1 h.
Wherein, mixed base oil is the mixture of 150BS base oil, 350SN base oil, wherein, 150BS base oil: the mass part ratio of the 350SN base oil is 1: 4;
the mass parts of the ethylene glycol, the stearic acid, the titanium isopropoxide and the natural fiber are respectively 2 parts, 1.67 parts, 3.33 parts and 7 parts.
Step two, adding 10 parts of distilled water, and then gradually heating the mixture to 210-240 ℃; the specific temperature is 225 ℃.
Step three, preparing a mixture of the modifier and the base oil;
weighing graphene and nano graphite according to a proportion; and then ultrasonically dispersing the graphene and the nano graphite in the base oil for 30 min. The parts of the nano graphite are 0.8 part and 0.3 part of graphene.
Step three, preparing a mixture of the modifier and the base oil;
the diameter size of the nano graphite is 2 mm; the carbon content of the graphene is 97-99 wt%, and the specific surface size is not less than 499m 2/g. The thickness of the graphene is 4-6nm, and the transverse dimension of the graphene is 1-3 mu m.
Weighing graphene and nano graphite in proportion; and then ultrasonically dispersing the graphene and the nano graphite in the base oil for 30 min. The parts of the nano graphite are 0.2 part and 0.3 part of graphene.
Step four, adding the mixture prepared in the step three into the mixed solution prepared in the step two, and stirring for 25min at the temperature of 225 ℃;
step five, cooling the mixture to room temperature, and then stopping heating and stirring to obtain a crude product.
And step six, homogenizing the crude product to obtain a refined product. The crude product was homogenized 5 times using a three-roll mill.
Example three-example ten
In these examples, the experimental procedure was substantially the same as that of example two. Except for the selection of the parts of the nano graphite. In examples three to ten, the parts of the nano-graphite were 0.4 part, 0.6 part, 0.8 part, 1.0 part, 1.2 parts, 1.4 parts, 1.6 parts, and 1.8 parts, respectively.
Example eleven-example twenty
The experimental procedure was substantially the same as that of example two. Except for the selection of the parts of the nano graphite. In examples eleven to twenty, the parts of the nano-graphite are 0.2 part, 0.4 part, 0.6 part, 0.8 part, 1.0 part, 1.2 parts, 1.4 parts, 1.6 parts, and 1.8 parts, respectively. The diameter of the nano graphite is 3.5 mu m.
Example twenty-eight
The experimental procedure was substantially the same as that of example two. Except for the selection of the parts of the nano graphite. In examples twenty to twenty-eight, the parts of the nano-graphite are 0.2 part, 0.4 part, 0.6 part, 0.8 part, 1.0 part, 1.2 parts, 1.4 parts, 1.6 parts, and 1.8 parts, respectively. The diameter of the nano graphite is 6 μm.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (9)
1. The sealing grease for the shield machine is characterized by comprising the following raw materials in parts by weight:
80-90 parts of base oil;
10-20 parts of a thickening agent; the thickener does not contain one or more of benzoic acid, lithium-based greases; the thickening agent is one or more of glycol, stearic acid composite titanium soap, fiber and mica sheet;
0.1-3 parts of a modifier; the modifier does not comprise one or more of nano-ceria, isobutylene thioether.
2. The sealing grease for the shield tunneling machine according to claim 1, characterized in that: the base oil is one or more of 140BS base oil, 150BS base oil, 160BS base oil, 340SN base oil, 350SN base oil and 360SN base oil.
3. The sealing grease for the shield tunneling machine according to claim 1, characterized in that: the modifier is one or more of graphene and nano graphite.
4. The sealing grease for the shield machine according to claim 1, characterized in that: the thickening agent is a mixture of glycol, stearic acid composite titanium soap and fibers.
5. The sealing grease for the shield tunneling machine according to claim 1, which is prepared from the following raw materials in parts by weight:
85 parts of base oil;
14 parts of a thickening agent;
0.3 part of graphene;
0.8 part of nano graphite.
6. The preparation method of the sealing grease for the shield machine is characterized by comprising the following steps:
step 1, adding a mixture of ethylene glycol, stearic acid, titanium isopropoxide and natural fibers into mixed base oil, heating to 70-90 ℃, and keeping constant for 0.6-1.5 hours;
step 2, adding distilled water, and then gradually heating the mixture to 210-240 ℃;
step 3, preparing a mixture of the modifier and the base oil;
step 4, adding the mixture prepared in the step 3 into the product obtained in the step 2;
step 5, cooling the mixture prepared in the step 4 to room temperature, and stopping stirring to obtain a crude product;
and 6, homogenizing the crude product to obtain a refined product.
7. The method for preparing the sealing grease for the shield tunneling machine according to claim 6, characterized by comprising the following steps: the mixed base oil is a mixture of 150BS base oil and 350SN base oil, wherein the ratio of 150BS base oil: the mass part ratio of the 350SN base oil is 1: 4.
8. The preparation method of the sealing grease for the shield tunneling machine according to claim 6, characterized by comprising the following steps: the mixture of the modifier and the base oil comprises the following steps: weighing graphene and nano graphite according to a proportion; and then ultrasonically dispersing the graphene and the nano graphite in the base oil for 20-40 min.
9. The method for preparing the sealing grease for the shield tunneling machine according to claim 8, characterized by comprising the following steps: the diameter size of the nano graphite is 2 mm; the mass portion of the nano graphite is 0.8 portion.
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