CN112852522B - Application of block type poly (methyl) acrylate polymer as dispersant of nano-copper additive in lubricating oil - Google Patents
Application of block type poly (methyl) acrylate polymer as dispersant of nano-copper additive in lubricating oil Download PDFInfo
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- CN112852522B CN112852522B CN202110055427.1A CN202110055427A CN112852522B CN 112852522 B CN112852522 B CN 112852522B CN 202110055427 A CN202110055427 A CN 202110055427A CN 112852522 B CN112852522 B CN 112852522B
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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
- C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K23/00—Use of substances as emulsifying, wetting, dispersing, or foam-producing agents
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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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/04—Elements
- C10M2201/05—Metals; Alloys
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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
- 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
Abstract
The invention discloses an application of a block type poly (methyl) acrylate polymer as a dispersing agent of a nano copper additive in lubricating oil. The block type poly (methyl) acrylate polymer has good oil solubility and dispersibility, and the use of the block type poly (methyl) acrylate polymer as a nano-copper dispersing agent has not been reported.
Description
Technical Field
The invention belongs to the technical field of dispersants, and particularly relates to an application of a block type poly (methyl) acrylate polymer as a dispersant of a nano copper additive in lubricating oil.
Background
In recent years, the application of nanoparticles in the field of tribology has received more and more attention, and the application of the copper nanoparticles as lubricant additives has become one of the hot spots of research of researchers at home and abroad. The nano copper additive has higher activity due to larger specific surface area, surface atomic number and surface energy. In the friction process, the friction material is in an activated state due to the change of the structure and physical properties, is easily adsorbed to the friction surface in the activated state, and is deposited on the uneven friction surface through the effects of diffusion, permeation and the like, so that the effective protection effect is achieved. In addition, a large amount of heat energy generated on the surface of the friction pair with strong friction can promote the nano copper to soften, aggregate and connect into a flexible protective film, so that the friction coefficient of the friction pair can be reduced, abrasive wear in the boundary friction process during high load is reduced, and the friction pair is protected.
However, the application of the nano-copper particles in the lubricating oil has a great problem that the nano-copper particles are difficult to be stably dispersed in the lubricating oil for a long time as heterogeneous particles. The nano copper has very large surface energy, so that the nano copper is easy to adsorb and agglomerate mutually to form large particles to precipitate out after being dispersed in the lubricating oil, and the use of the lubricating oil is seriously influenced. Therefore, how to stably disperse the nano-copper in the lubricating oil for a long time is the focus of research on the nano-copper additive. Currently, there are two main methods commonly used, one is surface modification and the other is the addition of a dispersant to the lubricating oil. The surface modification method is adopted to introduce oil-soluble groups to the surface of the nano-copper, so that the process is complex and unstable, and the nano-copper loses a great part of the friction characteristics as nano-particles while being modified. The method of directly adding the dispersing agent is simple and easy to operate, the conventional dispersing agent such as alkenyl succinamides such as T151 and T154 is mainly adopted in the past research, the dispersing agent has a relatively long oil-soluble olefin chain (Mn is generally 1000 or 2000) and polar amino groups, the amino groups can generate a relatively strong physical and chemical adsorption effect with the surface of the nano copper, and the nano copper can be well dispersed in the lubricating oil with the help of the olefin chain. However, the activity of the nano-copper is too strong, the agglomeration effect is obvious, and the dispersion stability is still not ideal. The reports of dispersing the nano-copper by adopting a polyhydroxy polyglycerol or polyvinylpyrrolidone and other super-polar dispersing agents exist, but the dispersing agents with high polarity have great problems in oil solubility, are only suitable for polar systems, are related to research and test in suspension or polar solvents (such as ethanol), and have no application value in lubricating oil. The use of a dispersant of nano-copper, which is obtained by modifying polyglycerin such as synthetic polyglycerin stearate to improve its oil solubility, has a significant effect on the surface activity of lubricating oil, and has a significant negative effect on the properties such as anti-emulsifying property, anti-foaming property and stability of a detergent, and thus has a limited practical value.
Disclosure of Invention
The invention aims to effectively disperse nano copper by using a block type poly (methyl) acrylate polymer as a dispersing agent so as to ensure that the nano copper is stably dispersed in lubricating oil for a long time.
In order to achieve the purpose, the invention provides an application of a block type poly (methyl) acrylate polymer as a dispersing agent of a nano copper additive in lubricating oil.
In the present invention, the block type poly (meth) acrylate polymer refers to a block type polyacrylate polymer and/or a block type polymethacrylate polymer.
According to the invention, preferably, the structure of the block type poly (meth) acrylate polymer is shown as a formula I, wherein the monomers for forming the block A are alkyl acrylate and/or alkyl methacrylate, and the alkyl of the alkyl ester of the monomers for forming the block A is C1-C36 straight-chain alkyl and/or C1-C36 branched-chain alkyl; the monomers forming the block B are hydroxyl-containing monomers and/or amino-containing monomers;
according to the present invention, it is preferable that the monomer constituting the block B includes N, N-dimethylamino (meth) acrylate, N, N-dimethylamino acrylate, N, N-diacetamido (meth) acrylate, N, N-dibutylaminobarboxamide (meth) acrylate, N, N-dimethylaminoacrylamide, 3-hydroxypropyl (meth) acrylate, 3, 4-dihydroxybutyl (meth) acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl (meth) acrylate, 2, 5-ditolulate-1, 6-hexa-benzenediol (methylamine) acrylate, 1, 10-dethiol (methylamine) acrylate, 2-vinylamide, 2-methyl-5-vinylamide, at least one of vinyl amphetamine, N-vinyl xylene, N-vinyl acrylamide, N-vinyl butanol, N-vinyl pyridine, N-vinyl pyrrolidone and N-vinyl caprolactam.
In the invention, the structure shown in the formula I is of a two-block type and is divided into a block A and a block B.
In the present invention, the block-type poly (meth) acrylate polymer of the present invention is a two-block polymer and can be obtained by a reversible addition fragmentation chain transfer (RAFT) radical polymerization method. The reversible addition fragmentation chain transfer agent used was isobutyronitrile dithiobenzoate.
According to the present invention, it is preferable that the block-type poly (meth) acrylate polymer has a molar ratio of the monomer constituting the block B to the total monomer constituting the block-type poly (meth) acrylate polymer of 1 to 20%.
According to the present invention, it is preferable that the block-type poly (meth) acrylate polymer has a molar ratio of the monomers constituting the block B to the total monomers constituting the block-type poly (meth) acrylate polymer of 2 to 15%.
According to the present invention, it is preferable that the block-type poly (meth) acrylate polymer has a molar ratio of the monomers constituting the block B to the total monomers constituting the block-type poly (meth) acrylate polymer of 5 to 10%.
In the present invention, the total monomers constituting the block-type poly (meth) acrylate polymer is the sum of the monomers constituting the blocks A and B.
According to the present invention, it is preferable that the block-type poly (meth) acrylate-based polymer has a number average molecular weight of 3000-500000.
According to the present invention, it is preferable that the block-type poly (meth) acrylate-based polymer has a number average molecular weight of 10000-300000.
According to the present invention, it is preferable that the block-type poly (meth) acrylate-based polymer has a number average molecular weight of 50000-200000.
According to the present invention, it is preferable that the mass ratio of the addition amount of the block-type poly (meth) acrylate-based polymer to the addition amount of the nano copper additive is not less than 2.
In the present invention, the addition amount of the block-type poly (meth) acrylate polymer refers to the addition amount of the block-type poly (meth) acrylate polymer as a dispersant of the nano copper additive in the lubricating oil.
The technical scheme of the invention has the following beneficial effects:
(1) the block type poly (methyl) acrylate polymer has good oil solubility and dispersibility, and the use of the block type poly (methyl) acrylate polymer as a nano-copper dispersing agent has not been reported.
(2) Dispersants generally include solvating groups and anchoring groups in their structure. The anchoring group is adsorbed together with the nano-copper through the actions of hydrogen bond, van der waals force, covalent bond and the like, and the solvating group has good compatibility with a dispersion medium and can disperse the nano-copper adsorbed together with the anchoring group. The traditional dispersing agent generally has one or more polar groups (anchoring groups), although the traditional dispersing agent has good affinity with the nano-copper, the affinity with the surface of the nano-copper is not firm enough, and the adsorbed dispersing agent is easy to desorb to cause the flocculation of the nano-copper; the solvating group of the traditional dispersant is generally in an alkane chain structure, the molecular weight is generally not more than 2000, even if the anchoring group can be firmly adsorbed on the surface of the nano-copper, the solvating of the traditional dispersant cannot generally form a protective layer with enough thickness, and the good isolation effect (the isolation effect can prevent the nano-copper from flocculating) on the nano-copper can not be realized. However, the block type poly (meth) acrylate polymer of the present invention has the following structural advantages as a dispersant: block a is used as solvating chain and block B is used as anchoring group chain. The anchoring group chain can be firmly adsorbed on the surface of the nano-copper in a super-multi-point anchoring mode, the solvation chain can adjust the compatibility of the solvation chain and the base oil by selecting different polymerization monomers or changing the mixing ratio of the comonomers, and meanwhile, the molecular weight of the solvation chain can be increased to ensure that the solvation chain forms enough space thickness on the surface of the nano-copper; the excessive side chain structure can promote the nano copper to form enough isolation space on the surface of the nano copper.
(3) Compared with the random polymer dispersant, the block polymer dispersant of the invention also has obvious advantages in molecular structure. The anchoring groups of the irregular polymer dispersant are dispersed on the main polymer chain, so that the adsorption sites between the anchoring groups and the nano-copper are dispersed, and the adsorption sites are blocked and shielded by solvating groups, so that the effective utilization rate of the adsorption sites on the surface of the nano-copper is reduced, and the anchoring strength is not ideal. Similarly, the solvating group is interrupted by an anchoring group. In general, the dispersion action of the random polymer dispersant on the nano-copper tends to be in an unordered disordered state, which is not favorable for uniform dispersion of the nano-copper. The A, B two-block structure of the block polymer dispersant can effectively avoid the problems, the solvation chain part (block A) can freely play the role of dissolving, and the anchoring group part (block B) can form the firm adsorption of ultra-multiple sites without being hindered, and the two are not influenced mutually.
(4) The block type poly (methyl) acrylate polymer also has certain help for improving the viscosity index of the lubricating oil, thickening, assisting in dispersing oil sludge and the like, and has no negative influence on other performances of the lubricating oil.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The percent amounts of dispersant and nano-copper used in the following examples and comparative examples are based on the total amount of 150N base oil used.
Example 1
Adding 1% of dispersant A and 0.2% of nano-copper (20nm) into 150N of base oil, heating to 60 ℃, stirring for 30min, and homogenizing for 30min by a homogenizer to obtain the stable nano-copper lubricating oil.
The dispersing agent A is shown as a formula I, monomers forming the block A are dodecyl methacrylate and tetradecyl methacrylate, (wherein the molar ratio of the dodecyl methacrylate to the tetradecyl methacrylate is 3:1), the monomers forming the block B are N-vinyl pyrrolidone, and the molar ratio of the monomers forming the block A to the monomers forming the block B is 17: 3. The number average molecular weight of the dispersant A was 50000.
The preparation method of the dispersant A comprises the following steps: monomers (25.4 g of dodecyl methacrylate and 9.46g of tetradecyl methacrylate) for forming a block A, 0.175g of azodiisobutyronitrile serving as an initiator, 0.2g of isobutyronitrile serving as a transfer agent and 16g of 100N (Korean Binglong) serving as a reaction solvent base oil are added into a reactor, the reaction temperature is set to be 80 ℃, the mixture is reacted for 8 hours, then, a monomer (2.615 g of N-vinyl pyrrolidone) for forming a block B is added, 0.019g of azodiisobutyronitrile is supplemented, and the mixture is reacted for 8 hours, so that the dispersing agent A is obtained.
Example 2
Adding 1% of dispersant B and 0.1% of nano-copper (25nm) into 150N of base oil, heating to 60 ℃, stirring for 30min, and homogenizing for 30min by a homogenizer to obtain the stable nano-copper lubricating oil.
The dispersant B is shown as a formula I, the monomers forming the block A are isooctyl methacrylate and hexadecyl methacrylate (wherein, the molar ratio of the isooctyl methacrylate to the hexadecyl methacrylate is 1:1), the monomers forming the block B are 2-hydroxyethyl methacrylate, and the molar ratio of the monomers forming the block A to the monomers forming the block B is 23: 2. The number average molecular weight of the dispersant B was 10000.
The preparation method of the dispersant B comprises the following steps: monomers (isooctyl methacrylate 19.8 and hexadecyl methacrylate 31g) forming a block A, an initiator azobisisobutyronitrile 0.985g, a transfer agent isobutyronitrile 0.4g and a reaction solvent base oil 100N (Korea Bilong) 23g are added into a reactor, the reaction temperature is set to be 80 ℃, the reaction is carried out for 8 hours, then a monomer (2-hydroxyethyl methacrylate 2.26g) forming a block B is added, 0.109g of azobisisobutyronitrile is supplemented, and the reaction is carried out for 8 hours, so that a dispersing agent B is obtained.
Example 3
Adding 0.6% of dispersant A and 0.3% of nano-copper (15nm) into 150N of base oil, heating to 60 ℃, stirring for 30min, and homogenizing for 30min by a homogenizer to obtain the stable nano-copper lubricating oil.
The dispersing agent C is shown as a formula I, the monomers forming the block A are butyl methacrylate, dodecyl acrylate and tetradecyl acrylate, the molar ratio of the butyl methacrylate, the dodecyl acrylate and the tetradecyl acrylate is 1:3:1, the monomers forming the block B are N, N-dimethylamino acrylamide, and the molar ratio of the monomers forming the block A to the monomers forming the block B is 4: 1. The number average molecular weight of the dispersant C was 150000.
The preparation method of the dispersant C comprises the following steps: monomers (2.84 g of butyl methacrylate, 14.4g of dodecyl acrylate and 5.36g of tetradecyl acrylate) forming a block A, 0.058g of azodiisobutyronitrile serving as an initiator, 0.11g of isobutyronitrile serving as a transfer agent and 9.68g of 100N (Korean Binglong) serving as a reaction solvent base oil are added into a reactor, the reaction temperature is set to be 80 ℃, the mixture is reacted for 8 hours, then, 2.475g of N, N-dimethylamino acrylamide (NIA) forming a block B is added, 0.006g of azodiisobutyronitrile is supplemented, and the mixture is reacted for 8 hours to obtain a dispersing agent C.
Example 4
Adding 0.4% of dispersant A and 0.2% of nano-copper (20nm) into 150N of base oil, heating to 60 ℃, stirring for 30min, and homogenizing for 30min by a homogenizer to obtain the stable nano-copper lubricating oil.
The dispersing agent D is shown as a formula I, monomers forming the block A are methyl methacrylate, butyl methacrylate, hexadecyl methacrylate, octadecyl methacrylate and trihexadecyl methacrylate, the molar ratio of the monomers is 1:1:6:2:1, the monomers forming the block B are N-vinyl pyrrolidone and N, N-dimethylamino acrylamide, and the molar ratio of the N-vinyl pyrrolidone to the N, N-dimethylamino acrylamide is 1: 1. The molar ratio of the monomers constituting block A to the monomers constituting block B was 50: 1. The number average molecular weight of the dispersant D is 200000.
The preparation method of the dispersant D comprises the following steps: monomers (1 g of methyl methacrylate, 1.42g of butyl methacrylate, 18.6 g of hexadecyl methacrylate, 6.76g of octadecyl methacrylate and 8.7g of trihexadecyl methacrylate) forming a block A, 0.051g of azodiisobutyronitrile serving as an initiator, 0.09g of isobutyronitrile serving as a transfer agent and 15.6g of 100N (Korean Bilong) serving as a reaction solvent base oil are added into a reactor, the reaction temperature is set to be 80 ℃, the mixture is reacted for 8 hours, then, monomers (0.122 g of N-vinyl pyrrolidone and 0.109g of N, N-dimethylamino acrylamide) forming a block B are added, 0.006g of azodiisobutyronitrile is supplemented, and the mixture is reacted for 8 hours to obtain a dispersing agent D.
Example 5
Adding 2% of dispersant E and 0.3% of nano-copper (20nm) into 150N base oil, heating to 60 ℃, stirring for 30min, and homogenizing for 30min by using a homogenizer to obtain the stable nano-copper lubricating oil.
The dispersing agent E is shown as a formula I, monomers forming the block A are methyl methacrylate, tetradecyl methacrylate, ditetradecyl methacrylate and isooctyl methacrylate, the molar ratio of the monomers is 1:5:1:2, and the monomers forming the block B are N-vinyl pyrrolidone. The molar ratio of monomers constituting block a to monomers constituting block B was 65: 1. The number average molecular weight of the dispersant E was 8000.
The preparation method of the dispersant E comprises the following steps: monomers (1 g of methyl methacrylate, 14.1g of tetradecyl methacrylate, 4.22g of ditetradecyl methacrylate and 3.97g of isooctyl methacrylate) forming a block A, 1.02g of azobisisobutyronitrile as an initiator, 0.57g of isobutyronitrile as a transfer agent and 9.98g of 100N (Korea Bilong) as reaction solvent base oil are added into a reactor, the reaction temperature is set to be 80 ℃, the mixture is reacted for 8 hours, then, a monomer (0.122 g of N-vinyl pyrrolidone) forming a block B is added, 0.113g of azobisisobutyronitrile is supplemented, and the dispersant E is obtained after the reaction for 8 hours.
Example 6
Adding 1% of dispersing agent F and 0.2% of nano-copper (20nm) into 150N of base oil, heating to 60 ℃, stirring for 30min, and homogenizing for 30min by a homogenizer to obtain the stable nano-copper lubricating oil.
The dispersing agent F is shown as a formula I, monomers forming the block A are methyl acrylate, tetradecyl methacrylate, hexadecyl acrylate and isooctyl methacrylate, the molar ratio of the monomers is 1:5:2:1, and the monomer forming the block B is N-vinyl pyrrolidone. The molar ratio of the monomers constituting block A to the monomers constituting block B was 90: 1. The number average molecular weight of the dispersant E is 20000.
The preparation method of the dispersing agent F comprises the following steps: monomers (0.86 g of methyl acrylate, 14.1g of tetradecyl methacrylate, 5.92g of hexadecyl acrylate and 1.98g of isooctyl methacrylate) forming a block A, 0.44g of azobisisobutyronitrile as an initiator, 0.07g of isobutyronitrile as a transfer agent and 9.8g of 100N (Korea Bilong) as reaction solvent base oil are added into a reactor, the reaction temperature is set to be 80 ℃, the mixture is reacted for 8 hours, then, 0.111g of N-vinylpyrrolidone (N-vinylpyrrolidone) forming a block B is added, 0.049g of azobisisobutyronitrile is supplemented, and the dispersant E is obtained after the reaction for 8 hours.
Comparative example 1
Adding 1% of dispersant T161 (high molecular weight polyisobutylene succinimide) and 0.2% of nano-copper (20nm) into 150N of base oil, heating to 60 deg.C, stirring for 30min, and homogenizing for 30min with a homogenizer to obtain nano-copper lubricating oil. The dispersant T161 (high molecular weight polyisobutylene succinimide) was purchased from tin-free southern Petroleum additives, Inc.
Comparative example 2
Adding 1% random macromolecular dispersant G and 0.2% nano-copper (20nm) into 150N base oil, heating to 60 deg.C, stirring for 30min, and homogenizing for 30min with homogenizer to obtain nano-copper lubricating oil.
The synthesis method of the dispersant G is as follows: 25.4G of dodecyl methacrylate, 9.4G of tetradecyl methacrylate, 2.615G of N-vinyl pyrrolidone, 0.175G of azodiisobutyronitrile serving as an initiator, 0.2G of dodecyl mercaptan serving as a transfer agent and 16G of 100N (Korean Binglong) serving as a reaction solvent base oil are added into a reactor, the reaction temperature is set to be 80 ℃, the mixture is reacted for 8 hours, 0.019G of azodiisobutyronitrile is added, and the mixture is reacted for 8 hours to obtain the dispersing agent G.
Test example
The nano-copper lubricating oil prepared in the above examples and comparative examples was introduced into a transparent glass test tube, and the dispersibility of nano-copper in the lubricating oil was observed by standing and storing at 25 ℃. The specific test results are shown in table 1.
TABLE 1
As can be seen from Table 1, the block type poly (meth) acrylate polymer of the present invention can disperse the nano-copper additive well, and has significant advantages over conventional dispersants.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (7)
1. The application of a block type poly (methyl) acrylate polymer as a dispersant of a nano-copper additive in lubricating oil;
the block type poly (meth) acrylate polymer has a structure shown in formula I, wherein a monomer forming the block A is alkyl acrylate and/or alkyl methacrylate, and an alkyl of the alkyl ester forming the block A is a linear alkyl of C1-C36 and/or a branched alkyl of C1-C36; the monomers forming the block B are hydroxyl-containing monomers and/or amino-containing monomers;
wherein the monomer constituting the block B comprises at least one of N, N-dimethylamino (meth) acrylate, N, N-dimethylamino acrylate, N, N-diacetamido (meth) acrylate, N, N-dimethylaminoacrylamide, 3-hydroxypropyl (meth) acrylate, 3, 4-dihydroxybutyl (meth) acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl (meth) acrylate, vinylphenylamine, N-vinylacrylamide, N-vinylpyrrolidone and N-vinylcaprolactam;
wherein the number average molecular weight of the block type poly (meth) acrylate polymer is 3000-500000.
2. Use according to claim 1, wherein the block-type poly (meth) acrylate polymer has a molar proportion of the monomers constituting the block B in the total monomers constituting the block-type poly (meth) acrylate polymer of 1 to 20%.
3. Use according to claim 2, wherein the block-type poly (meth) acrylate polymer has a molar ratio of the monomers constituting the block B in the total monomers constituting the block-type poly (meth) acrylate polymer of 2 to 15%.
4. Use according to claim 3, wherein the block-type poly (meth) acrylate polymer has a molar proportion of the monomers constituting the block B in the total monomers constituting the block-type poly (meth) acrylate polymer of 5 to 10%.
5. The use as claimed in claim 1, wherein the block-type poly (meth) acrylate polymer has a number average molecular weight of 10000-300000.
6. The use as claimed in claim 5, wherein the block-type poly (meth) acrylate-based polymer has a number average molecular weight of 50000-200000.
7. The use according to claim 1, wherein the mass ratio of the addition amount of the block-type poly (meth) acrylate-based polymer to the addition amount of the nano-copper additive is not less than 2.
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| DE102010038615A1 (en) * | 2010-07-29 | 2012-02-02 | Evonik Rohmax Additives Gmbh | Polyalkyl (meth) acrylate for improving lubricating oil properties |
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