CN110964593B - Polymerization-induced self-assembly oleogel and preparation method and application thereof - Google Patents

Polymerization-induced self-assembly oleogel and preparation method and application thereof Download PDF

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CN110964593B
CN110964593B CN201911309080.8A CN201911309080A CN110964593B CN 110964593 B CN110964593 B CN 110964593B CN 201911309080 A CN201911309080 A CN 201911309080A CN 110964593 B CN110964593 B CN 110964593B
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methacrylate
chain transfer
assembly
polymerization
self
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CN110964593A (en
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张耀明
陶立明
王齐华
王廷梅
陈守兵
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Lanzhou Institute of Chemical Physics LICP of CAS
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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
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
    • C08F293/005—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule using free radical "living" or "controlled" polymerisation, e.g. using a complexing 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
    • 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
    • C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers 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
    • 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
    • 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
    • C10M2209/10—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

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Abstract

The invention relates to the technical field of oil gel, in particular to polymerization-induced self-assembly oil gel and a preparation method and application thereof. The polymerization-induced self-assembly oil gel provided by the invention comprises a block copolymer and base oil. The long-chain methacrylate in the polymerization-induced self-assembly structure can be well dissolved and dispersed in the base oil, the base oil is wrapped in the long-chain methacrylate in situ, and lubricating oil is continuously released in the friction process, so that the lubricating oil has good lubricating performance; and the oil gel has a self-assembled worm-like structure, is in a physical crosslinking effect, and can promote the generation of a transfer film in a friction process so as to improve the bearing capacity. According to the description of the embodiment, the polymerization-induced self-assembly oil gel has reversible temperature sensitivity and can realize the change of sol from normal temperature gel to 80 ℃; the friction coefficient is 0.125, and the lubricating property is better; the friction coefficient of the material can be kept stable under the load of 300N force and is 0.125, and the material has better bearing capacity.

Description

Polymerization-induced self-assembly oleogel and preparation method and application thereof
Technical Field
The invention relates to the technical field of oil gel, in particular to polymerization-induced self-assembly oil gel and a preparation method and application thereof.
Background
The oleogel refers to a solid or semi-solid substance formed by immobilizing a base oil or an organic solvent therein through a three-dimensional structure. The oil gel which fixes the lubricating oil base oil in a three-dimensional structure shows the performance similar to that of lubricating grease, can be used as a solid lubricant in industry, and realizes the purposes of improving the service temperature range of the lubricant, improving the bearing capacity and the like, thereby receiving wide attention. Typically, the formation of oleogels can be achieved by the formation of hydrogen bonds or by the addition of fibrous materials.
However, the application of oil gel in the field of lubricant is always limited due to the problems of poor lubricating performance and low bearing capacity.
Disclosure of Invention
The invention aims to provide a polymerization-induced self-assembly oleogel, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a polymerization-induced self-assembly oil gel, which comprises a block copolymer and base oil;
the block copolymer has a structure represented by formula I:
Figure BDA0002324007040000011
wherein m is 15-50, n is 50-500, and x is 9-17;
the base oil is polyalphaolefin and/or polyethylene glycol.
Preferably, the mass ratio of the block copolymer to the base oil is (15-50): 100.
the invention also provides a preparation method of the polymerization-induced self-assembly oleogel, which comprises the following steps:
mixing a methacrylate monomer, a chain transfer agent, a first initiator and a solvent, and carrying out reversible addition-fragmentation chain transfer free radical polymerization reaction to obtain a macromolecular chain transfer agent;
and mixing the macromolecular chain transfer agent, benzyl methacrylate, a second initiator and base oil, and carrying out in-situ self-assembly to obtain the polymerization-induced self-assembly oil gel.
Preferably, the methacrylate monomer is decyl methacrylate, undecyl methacrylate, lauryl methacrylate, tridecyl methacrylate, tetradecyl methacrylate, pentadecyl methacrylate, hexadecyl methacrylate, heptadecyl methacrylate, or octadecyl methacrylate.
Preferably, the chain transfer agent is one or more of benzyl dithiobenzoate, S-dibenzyltrithiocarbonate, 2-cyano-2-propyl-4-cyanobenzodithioate and 2- (dodecylmercaptothiocarbonylthio) -2-methylpropionic acid.
Preferably, the first initiator or the second initiator is, independently, azobisisobutyronitrile and/or azobiscyclohexylcarbonitrile;
the solvent is acetonitrile and/or tetrahydrofuran.
Preferably, the mole ratio of the methacrylate monomer, the chain transfer agent and the first initiator is (15-50): 1: (0.1 to 0.3);
the temperature of the reversible addition-fragmentation chain transfer free radical polymerization reaction is 60-80 ℃, and the time of the reversible addition-fragmentation chain transfer free radical polymerization reaction is 3-12 h.
Preferably, the molar ratio of the macromolecular chain transfer agent, benzyl methacrylate and second initiator is 1: (50-500): (0.1 to 0.3);
the temperature of the in-situ self-assembly is 60-90 ℃, and the time of the in-situ self-assembly is 3-30 h.
Preferably, before the reversible addition-fragmentation chain transfer radical polymerization reaction or the in-situ self-assembly, the method further comprises the step of deoxidizing the mixed solution obtained by mixing;
the deoxidation treatment adopts a method of introducing inert gas or a freezing-degassing-inflation melting circulation method.
The invention also provides application of the polymerization-induced self-assembly oleogel in the technical scheme or the polymerization-induced self-assembly oleogel prepared by the preparation method in the technical scheme in the field of lubricants.
The invention provides a polymerization-induced self-assembly oil gel which comprises a block copolymer and base oil. The long-chain methacrylate in the polymerization-induced self-assembly structure can be well dissolved and dispersed in the base oil, the base oil is wrapped in the long-chain methacrylate in situ, and lubricating oil is continuously released in the friction process, so that the lubricating oil has good lubricating performance; the self-assembled worm-like structure is a physical cross-linking effect, and can promote the generation of a transfer film in the friction process so as to improve the bearing capacity. According to the description of the embodiment, the polymerization-induced self-assembly oil gel has reversible temperature sensitivity, and can realize the change from normal-temperature gel to sol at 80 ℃; the friction coefficient is kept at 0.125, so that the lubricating oil has better lubricating performance and better bearing capacity, and can still keep lower friction coefficient under the action of 300N force.
The invention also provides a preparation method of the polymerization-induced self-assembly oleogel, which comprises the following steps: mixing a methacrylate monomer, a chain transfer agent, a first initiator and a solvent, and carrying out reversible addition-fragmentation chain transfer free radical polymerization reaction to obtain a macromolecular chain transfer agent; and mixing the macromolecular chain transfer agent, benzyl methacrylate, a second initiator and base oil, and carrying out in-situ self-assembly to obtain the polymerization-induced self-assembly oil gel. The preparation method omits the post-treatment process, can prepare the oil gel with higher molecular weight and higher degree of regularity and monodispersity, and has simple preparation method and wide applicability.
Drawings
FIG. 1 is a graph showing the molecular weight distribution of the macromolecular chain transfer agent and the block copolymer prepared in example 1;
FIG. 2 is a diagram showing the state of the oleogel prepared in example 2 at room temperature and 80 ℃;
FIG. 3 is a graph comparing the lubricating properties of the oleogel prepared in example 3 with a base oil;
FIG. 4 is a transmission electron micrograph of the block copolymer prepared in example 4.
Detailed Description
The invention provides a polymerization-induced self-assembly oil gel, which comprises a block copolymer and base oil;
the block copolymer has a structure represented by formula I:
Figure BDA0002324007040000031
wherein m is 15-50, n is 50-500, and x is 9-17;
the base oil is polyalphaolefin and/or polyethylene glycol.
In the present invention, the mass ratio of the block copolymer to the base oil is preferably (15 to 50): 100, more preferably (20-40): 100, most preferably (25-35): 100.
the invention also provides a preparation method of the polymerization-induced self-assembly oleogel, which comprises the following steps:
mixing a methacrylate monomer, a chain transfer agent, a first initiator and a solvent, and carrying out reversible addition-fragmentation chain transfer free radical polymerization reaction to obtain a macromolecular chain transfer agent;
and mixing the macromolecular chain transfer agent, benzyl methacrylate, a second initiator and base oil, and carrying out in-situ self-assembly to obtain the polymerization-induced self-assembly oil gel.
In the present invention, the reaction equation of the preparation process of the polymerization-induced self-assembled oil gel is shown in formula II:
Figure BDA0002324007040000041
in the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.
According to the invention, a methacrylate monomer, a chain transfer agent, a first initiator and a solvent are mixed to carry out reversible addition-fragmentation chain transfer free radical polymerization reaction, so as to obtain a macromolecular chain transfer agent. In the present invention, the methacrylate monomer is preferably decyl methacrylate, undecyl methacrylate, lauryl methacrylate, tridecyl methacrylate, tetradecyl methacrylate, pentadecyl methacrylate, hexadecyl methacrylate, heptadecyl methacrylate, or octadecyl methacrylate.
In the present invention, the chain transfer agent is preferably one or more of benzyl dithiobenzoate, S-dibenzyltrithiocarbonate, 2-cyano-2-propyl-4-cyanobenzodithioate, and 2- (dodecylmercaptothiocarbonylthio) -2-methylpropionic acid. When the chain transfer agent is more than two of the above specific choices, the invention does not have any special limitation on the proportion of the specific substances, and the specific substances can be mixed according to any proportion.
In the present invention, the first initiator is preferably azobisisobutyronitrile and/or azobiscyclohexylcarbonitrile; when the first initiator is a mixture of azobisisobutyronitrile and azobiscyclohexylcarbonitrile, the specific ratio of the specific substances is not limited in any way, and the specific substances can be mixed according to any ratio.
In the present invention, the solvent is preferably acetonitrile and/or tetrahydrofuran; when the solvent is a mixture of acetonitrile and tetrahydrofuran, the mixture ratio of the acetonitrile to the tetrahydrofuran is not limited in any particular way, and the acetonitrile and the tetrahydrofuran are mixed according to any mixture ratio.
In the present invention, the molar ratio of the methacrylate monomer, the chain transfer agent and the first initiator is preferably (15 to 50): 1: (0.1 to 0.3), more preferably (20 to 40): 1: (0.15-0.25), most preferably (25-35): 1: 0.2. in the invention, the dosage of the solvent is 20-70% of the total mass of the reaction system.
The present invention does not limit the mixing in any particular way, and the mixing may be carried out by a process known to those skilled in the art.
After the mixing is finished, the invention preferably comprises the step of deoxidizing the mixed solution obtained after the mixing, wherein the deoxidation treatment preferably adopts a method of introducing inert gas or a freezing-degassing-inflation melting circulation method; the present invention does not have any particular limitation on either method, and can be carried out by a procedure well known to those skilled in the art.
In the invention, the temperature of the reversible addition-fragmentation chain transfer free radical polymerization reaction is preferably 60-80 ℃, more preferably 65-75 ℃, and most preferably 68-72 ℃; the time of the reversible addition-fragmentation chain transfer free radical polymerization reaction is preferably 3-12 h, more preferably 5-10 h, and most preferably 6-8 h. In the present invention, the reversible addition-fragmentation chain transfer radical polymerization is preferably carried out under stirring conditions, and the stirring conditions are not particularly limited in the present invention, and may be carried out by using conditions well known to those skilled in the art.
After the reversible addition-fragmentation chain transfer free radical polymerization reaction is finished, the invention also preferably comprises the step of carrying out post-treatment on a product system obtained by the reversible addition-fragmentation chain transfer free radical polymerization reaction, wherein the post-treatment preferably comprises precipitation, precipitation and drying; the present invention does not have any particular limitation on the precipitation, precipitation and drying processes, and the processes known to those skilled in the art can be used.
After the macromolecular chain transfer agent is obtained, the macromolecular chain transfer agent, benzyl methacrylate, a second initiator and base oil are mixed and subjected to in-situ self-assembly to obtain the polymerization-induced self-assembly oleogel. In the present invention, the second initiator is preferably azobisisobutyronitrile and/or azobiscyclohexylcarbonitrile; when the second initiator is a mixture of azobisisobutyronitrile and azobiscyclohexylcarbonitrile, the specific ratio of the specific substances is not limited in any way, and the specific substances can be mixed according to any ratio.
In the present invention, the base oil is a polyalphaolefin and/or a polyethylene glycol; the polyalphaolefin is preferably PAO4, PAO6, PAO8, or PAO 10; the polyethylene glycol is preferably PEG 200; when the base oil is more than two of the specific substances, the proportion of the specific substances is not limited in any way, and the base oil can be mixed according to any proportion.
In the present invention, the molar ratio of the macromolecular chain transfer agent, benzyl methacrylate and second initiator is preferably 1: (50-500): (0.1 to 0.3), more preferably 1: (100-400): (0.15 to 0.25), most preferably 1: (200-300): (0.15-0.2). In the invention, the dosage of the solvent is 15-50% of the total mass of the reaction system.
The present invention does not limit the mixing in any particular way, and the mixing may be carried out by a process known to those skilled in the art.
After the mixing is finished, the invention preferably comprises the step of deoxidizing the mixed solution obtained after the mixing, wherein the deoxidation treatment preferably adopts a method of introducing inert gas or a freezing-degassing-inflation melting circulation method; the present invention does not have any particular limitation on either method, and can be carried out by a procedure well known to those skilled in the art.
In the invention, the temperature of the in-situ self-assembly is preferably 60-90 ℃, more preferably 65-85 ℃, and most preferably 70-80 ℃; the time for the in-situ self-assembly is preferably 3-30 hours, more preferably 10-25 hours, and most preferably 15-20 hours. In the present invention, the in situ self-assembly is preferably performed under stirring conditions, and the stirring conditions in the present invention are not particularly limited, and may be conditions well known to those skilled in the art.
In the invention, the in-situ self-assembly process is that after a macromolecular chain transfer agent and benzyl methacrylate are firstly subjected to polymerization reaction to generate a block copolymer, the in-situ self-assembly is carried out in base oil.
The invention also provides application of the polymerization-induced self-assembly oleogel in the technical scheme or the polymerization-induced self-assembly oleogel prepared by the preparation method in the technical scheme in the field of lubricants. The method of the present invention is not particularly limited, and the method may be performed by a method known to those skilled in the art.
The polymerization-induced self-assembly oil gel provided by the present invention, the preparation method and the application thereof are described in detail below with reference to the examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Mixing 30mmol of lauryl methacrylate, 0.6mmol of benzyl dithiobenzoate, 0.06mmol of azobisisobutyronitrile and 10mL of acetonitrile, introducing argon for 50min for deoxidation, carrying out reversible addition-fragmentation chain transfer free radical polymerization (60 ℃,4h) under the stirring condition, precipitating, separating out and drying the obtained reaction liquid to obtain the macromolecular chain transfer agent (marked as PLM)20-CTA)；
To 0.5mmol PLM20Mixing CTA, 50mmol of benzyl methacrylate, 0.05mmol of azobisisobutyronitrile and 45mL of PAO10, introducing argon for 50min for deoxidation, and performing in-situ self-assembly (70 ℃,20h) under stirring to obtain the polymerization-induced self-assembly oleogel (marked as PLM)20-b-PBzMA100(ii) a The polymerization degree of lauryl methacrylate in the polymerization-induced self-assembly oil gel is 20, and the polymerization degree of benzyl polymethacrylate is 100; mass percent of block polymer in oleogel 20%);
for the PLM20CTA and PLM20-b-PBzMA100The molecular weight distribution chart of the molecular weight distribution obtained by the measurement of the molecular weight is shown in FIG. 1, and it is understood from FIG. 1 that the molecular weight dispersion is less than 1.1.
Example 2
Mixing 50mmol of octadecyl methacrylate, 2.5mmol of S, S-dibenzyltrithiocarbonate, 0.3mmol of azodicyclohexyl carbonitrile and 15mL of tetrahydrofuran, deoxidizing by adopting a freezing-air extraction-melting circulation method, performing reversible addition-fragmentation chain transfer radical polymerization (60 ℃,4h) under stirring, precipitating, separating out and drying the obtained reaction liquid to obtain a macromolecular chain transfer agent (marked as POMA)15-CTA)；
Mixing 0.1mmol POMA15Mixing CTA, 30mmol of benzyl methacrylate, 0.06mmol of azobisisobutyronitrile and 40mL of PAO10, introducing argon for 50min for deoxidation treatment, and performing in-situ self-assembly (80 ℃,8h) under stirring to obtain the polymerization-induced self-assembly oleogel (marked as POMA)15-b-PBzMA300(ii) a The polymerization degree of octadecyl methacrylate in the polymerization-induced self-assembly oleogel is 15, and the polymerization degree of benzyl polymethacrylate is 300; mass percent of block polymer in oleogel 15%);
FIG. 2 shows the POMA15-b-PBzMA300State diagram at normal temperature and 80 ℃; as can be seen from fig. 2, the oil gel is temperature sensitive, and is in a gel state at normal temperature and in a fluid state when heated to 80 ℃.
Example 3
Mixing 50mmol of decyl methacrylate, 1mmol of 2- (dodecyl thio-thiocarbonylthio) -2-methylpropanoic acid, 0.25mol of azodicyclohexyl carbonitrile and 100mL of acetonitrile, deoxidizing by adopting a freezing-air extraction-melting circulation method, carrying out reversible addition-fragmentation chain transfer radical polymerization reaction (70 ℃,12h) under the stirring condition, precipitating, separating out and drying the obtained reaction liquid to obtain a macromolecular chain transfer agent (marked as PSMA)50-CTA)；
Adding 0.6mmol of PSMA50mixing-CTA, 30mmol of benzyl methacrylate, 0.08mmol of azobisisobutyronitrile and 12ml of PAO8, introducing argon for 50min for deoxidation treatment, and performing in-situ self-assembly (70 ℃,12h) under stirring to obtain the polymerization-induced self-assembly oleogel (marked as PSMA)50-b-PBzMA500(ii) a The polymerization degree of decyl methacrylate in the polymerization-induced self-assembly oil gel is 50, and the polymerization degree of benzyl polymethacrylate is 500; the mass percent of block polymer in the oleogel is 50%);
the friction test was carried out on a SRV-4 friction machine using a plain oil gel, a bearing steel ball (Φ 10) was used as the friction ball, a polished bearing steel holder was used as a pair, and the friction coefficients were measured at a frequency of 25Hz and under loads of 50N, 100N, 200N, and 300N, respectively, and the test results are shown in fig. 3, where it is understood from fig. 3 that the friction coefficients were maintained at about 0.125 at a frequency of 25Hz and under loads of 50N, 100N, 200N, and 300N, respectively.
Example 4
Mixing 50mmol of hexadecyl methacrylate, 1mmol of 2-cyano-2-propyl-4-cyanobenzodisulfate, 0.3mmol of azobisisobutyronitrile and 10mL of tetrahydrofuran, introducing argon for 50min for deoxidation, carrying out reversible addition-fragmentation chain transfer free radical polymerization (60 ℃,10h) under the stirring condition, precipitating, separating out and drying the obtained reaction liquid to obtain the macromolecular chain transfer agent (marked as PCMA)30-CTA)；
Mixing 0.1mmol of PCMA30mixing-CTA, 40mmol of benzyl methacrylate, 0.03mmol of azobisisobutyronitrile and 27mL of PEG200, introducing argon for 50min for deoxidation, and performing in-situ self-assembly (70 ℃,12h) under stirring to obtainThe polymerization-induced self-assembled oleogel (denoted as PCMA)30-b-PBzMA400(ii) a The polymerization degree of hexadecyl methacrylate in the polymerization-induced self-assembly oil gel is 50, and the polymerization degree of benzyl polymethacrylate is 400; 30% by mass of block polymer in the oleogel);
the TEM test of the oil gel is shown in FIG. 4, and the results are shown in FIG. 4, and it can be seen from FIG. 4 that PCMA (Poly-lactide-co-glycolide) induced self-assembly is polymerized in PEG20030-b-PBzMA400Forming a long fiber-like structure.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. A polymerization-induced self-assembling oil gel, comprising a block copolymer and a base oil;
the block copolymer has a structure represented by formula I:
Figure FDA0003012653100000011
wherein m is 15-50, n is 50-500, and x is 9-17;
the base oil is polyethylene glycol;
the mass ratio of the block copolymer to the base oil is 15-50: 100, respectively;
the block copolymer encapsulates the base oil in situ.
2. The method of preparing a polymerization-induced self-assembled oleogel of claim 1, comprising the steps of:
mixing a methacrylate monomer, a chain transfer agent, a first initiator and a solvent, and carrying out reversible addition-fragmentation chain transfer free radical polymerization reaction to obtain a macromolecular chain transfer agent;
and mixing the macromolecular chain transfer agent, benzyl methacrylate, a second initiator and base oil, and carrying out in-situ self-assembly to obtain the polymerization-induced self-assembly oil gel.
3. The method of claim 2, wherein the methacrylate monomer is decyl methacrylate, undecyl methacrylate, lauryl methacrylate, tridecyl methacrylate, tetradecyl methacrylate, pentadecyl methacrylate, hexadecyl methacrylate, heptadecyl methacrylate, or octadecyl methacrylate.
4. The method of claim 2, wherein the chain transfer agent is one or more of benzyl dithiobenzoate, S-dibenzyltrithiocarbonate, 2-cyano-2-propyl-4-cyanobenzodithioate, and 2- (dodecylmercaptothiocarbonylthio) -2-methylpropionic acid.
5. The method of claim 2, wherein the first initiator or the second initiator is independently azobisisobutyronitrile and/or azobiscyclohexylcarbonitrile;
the solvent is acetonitrile and/or tetrahydrofuran.
6. The method of claim 2, wherein the molar ratio of the methacrylate monomer, the chain transfer agent, and the first initiator is 15 to 50: 1: 0.1 to 0.3;
the temperature of the reversible addition-fragmentation chain transfer free radical polymerization reaction is 60-80 ℃, and the time of the reversible addition-fragmentation chain transfer free radical polymerization reaction is 3-12 h.
7. The method of claim 2, wherein the molar ratio of the macromolecular chain transfer agent, benzyl methacrylate, and second initiator is 1: 50-500: 0.1 to 0.3;
the temperature of the in-situ self-assembly is 60-90 ℃, and the time of the in-situ self-assembly is 3-30 h.
8. The method according to claim 2, further comprising, before the reversible addition-fragmentation chain transfer radical polymerization or the in-situ self-assembly, subjecting the mixed solution obtained by the mixing to a deoxidation treatment;
the deoxidation treatment adopts a method of introducing inert gas or a freezing-degassing-inflation melting circulation method.
9. Use of the polymerization-induced self-assembled oleogel of claim 1 or the polymerization-induced self-assembled oleogel prepared by the preparation method of any one of claims 2 to 8 in the field of lubricants.
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