CN114015171B - Core-shell structure lubricant and application thereof in MC nylon - Google Patents
Core-shell structure lubricant and application thereof in MC nylon Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
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Abstract
The invention relates to a core-shell structure lubricant, which is prepared by taking Oxidized Polyethylene (OPE) as a core material and nano silicon dioxide (SiO) 2 ) Core-shell structure OPE @ SiO made of shell material 2 A nanoparticle lubricant. Meanwhile, the invention also discloses application of the lubricant in MC nylon. The invention effectively improves the self-lubricating property of the MC nylon material, reduces the friction coefficient, improves the wear-resisting property, does not generate oil stains on the friction surface, and can be suitable for the environment under vacuum or oil-free working conditions.
Description
Technical Field
The invention relates to the technical field of antifriction and wear resistance of high polymer composite materials, in particular to a core-shell structure lubricant and application thereof in MC nylon.
Background
Monomer casting nylon (MC nylon) is an engineering plastic obtained by carrying out anionic polymerization reaction on a long-chain lactam monomer and carrying out chain extension and crosslinking reaction on a reaction system by using a blocked and modified isocyanate activating agent under the action of an organic basic catalyst, is a relatively common high-molecular polymer material, and has the characteristics of high relative molecular weight and high crystallinity, so that the mechanical properties such as mechanical strength, rigidity, impact strength, hardness and the like of the monomer casting nylon are superior to those of common PA 6. Although the MC nylon has good self-lubricating property and wear resistance, when the MC nylon is used under the action of high load, the friction coefficient is high, the volume wear rate is high, the working condition requirement under the oil-free condition is difficult to meet, and the application of the MC nylon in many fields is limited due to the defects.
In order to improve the wear resistance and friction reduction performance of the MC nylon material, some traditional lubricants, such as graphite, nanotubes, carbon fibers and other solid lubricants, are usually added into the matrix resin, but the dispersion is difficult, and the degree of friction reduction and wear resistance is limited.
The core-shell structure is not only the form of presentation of adhesives, catalysts, viable cells, drugs, fragrances, vitamins, etc., but is also a form commonly used for solid lubricants. Polymer composites have been disclosed in the prior art for use in a variety of applications, such as self-lubricating compositions for abradable seals, conveyors, and the like. Related or similar inventive patents and development research results also appear.
The invention patent CN 101365739A discloses a microcapsule lubricant, which is a composite material with a carrier melting point of less than 260 ℃ and a melting point of a mixed material of microcapsules and a carrier polymer of less than 285 ℃ by using Polyformaldehyde (POM) as a shell material and using at least one of a lubricant, oil and a mixture thereof as a core material. Wherein the shell for containing lubricating oil may comprise the following materials: waxes such as animal waxes, vegetable waxes, or petroleum waxes; gelatin; polyvinyl alcohol; methyl cellulose; polyvinylpyrrolidone; a polyterephthalamide; and other polymers such as polyoxymethylene urea (PMU), PMU is a commonly used microcapsule shell.
The invention patent CN 111040431A discloses a preparation method of a self-lubricating microcapsule/MC nylon composite material, which comprises the steps of preparing a microcapsule shell layer precursor, preparing a microcapsule core layer precursor and finally preparing a liquid paraffin/polyether sulfone microcapsule.
However, the above documents have two disadvantages: the core material is liquid material such as lubricating oil and liquid paraffin, and also grease wax such as animal wax and vegetable wax which are relatively melted into liquid when the temperature exceeds 50 ℃. Although the liquid lubricant can also play a role in reducing friction coefficient and friction of abrasion in the running process of the friction assembly, the temperature of a local area of the friction surface is not increased in the friction motion process, but is in a temperature gradient with the distance from the friction surface, and high temperature exists at a position close to the friction surface, so that excessive lubrication of the friction surface can be formed when the friction temperature is slightly increased due to the temperature in the friction process, the recovery efficiency of the lubricant is reduced when the friction motion is stopped, and effective lubrication with long service life cannot be ensured in the motion assembly which is repeatedly started and stopped; the lubricant cannot be applied to a vacuum environment or a working condition environment where non-liquid exists.
Disclosure of Invention
The invention aims to solve the technical problem of providing a core-shell structure lubricant with good friction performance.
The invention aims to solve another technical problem of providing the application of the core-shell structure lubricant in MC nylon.
In order to solve the problems, the core-shell structure lubricant is characterized in that: the lubricant is prepared from polyethylene Oxide (OPE) as core material and nano-Silica (SiO) 2 ) Core-shell structure OPE @ SiO made of shell material 2 A nanoparticle lubricant.
The preparation method of the core-shell structure lubricant comprises the following steps:
firstly, Oxidized Polyethylene (OPE) and polyethylene block polyethylene glycol (PE)bPEG) at 200: 51, heating to 140 +/-2 ℃ until the mixture is completely melted into a transparent and colorless melt;
heating dimethylbenzene to 140 +/-2 ℃ in a reflux device, and then adding the dimethylbenzene into the melt; adding analytical grade tetraethyl orthosilicate (TEOS) when the temperature is heated to 140-145 ℃, then heating and raising the temperature, and keeping the temperature at 140-145 ℃; the weight ratio of the xylene to the melt is 4: 251; the weight ratio of the tetraethyl orthosilicate to the melt is 2000: 251;
Thirdly, a pH regulator which is heated to be boiling is rapidly added into the mixed solution obtained in the second step for reaction, the reaction solution is naturally cooled after the reaction is finished, and the core-shell structure OPE @ SiO is formed after continuous stirring for 12 hours 2 Mixing the solution; the addition amount of the pH regulator is 4% of the weight of the tetraethoxysilane;
all-around core-shell structure OPE @ SiO 2 Drying and centrifugally cleaning the mixed solution to obtain the core-shell structure OPE @ SiO 2 A nanoparticle lubricant.
The pH regulator in the step three is absolute ethyl alcohol and NH 3 25-28 wt.% ammonium hydroxide solution, based on 5: 3, and uniformly mixing the obtained mixed solution.
The application of the core-shell structure lubricant in MC nylon is characterized in that: the core-shell structure OPE @ SiO 2 The nano-particle lubricant is added into the monomer, and the self-lubricating MC nylon material is prepared through anionic polymerization.
The preparation method of the self-lubricating MC nylon material comprises the following steps:
putting the centrifugal mold in a constant-temperature oven, setting the temperature to be 175 ℃, and keeping the temperature constant after 1 hour;
placing the monomer in a three-necked bottle reaction container, completely melting the monomer at the temperature of 90-130 ℃, vacuumizing to less than-0.08 MPa by using a vacuum pump, and keeping for 20-30 minutes;
Thirdly, adding a catalyst accounting for 0.2-4% of the weight of the monomer, continuously vacuumizing to below-0.08 MPa, keeping the temperature at 120-130 ℃, and keeping the magnetic stirring and vacuum state for 20-30 minutes;
sequentially adding 1-15% of core-shell structure OPE @ SiO by weight of monomers into a reaction container 2 Continuously vacuumizing a nanoparticle lubricant and a toughening agent accounting for 1-15% of the weight of the monomer to be below-0.08 MPa, keeping the temperature at 120-130 ℃, and keeping the magnetic stirring and vacuum state for 20-30 minutes;
and fifthly, adding an activating agent accounting for 0.1-2% of the weight of the monomer, quickly dissolving the activating agent, quickly stirring, casting into a centrifugal mold in the step I, keeping the rotating speed of the centrifugal mold at 700-1500 rpm for 20 +/-3 minutes, stopping the rotation of the mold, closing the mold, heating, naturally cooling to room temperature, and taking out the molded part in the mold.
The monomer in the second step is a mixture of Caprolactam (CL) and laurolactam (LL) mixed according to the weight ratio of 1: 1-9: 1.
And the catalyst in the step (III) is organic sodium salt, and the organic sodium salt is sodium methoxide or sodium caprolactam.
The toughening agent in the fourth step is trifunctional polyether amine (PEA), the molecular weight of the toughening agent is 300-6000, and the optimal molecular weight is 2000-5000; the flexible molecular chain structure in the trifunctional polyether amine (PEA) is as follows:
The activating agent in the fifth step is blocked polyisocyanate (C-HDI) or carbodiimide modified aromatic diisocyanate (CI-TDI); the blocked polyisocyanate is mainly caprolactam blocked hexamethylene diisocyanate or HDI biuret; the content of the carbodiimide in the carbodiimide-modified aromatic diisocyanate is more than or equal to 12 percent, and the content of the isocyanato group (NCO) is more than or equal to 29 percent.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts tetraethyl orthosilicate (TEOS) and polyethylene block polyethylene glycol (PE-bPEG) is respectively used as a shell material and a precursor of the surfactant, the shell material and the precursor of the surfactant have good dispersibility in a caprolactam solution, and the integral density of the lubricant is close to that of a cast nylon material, so that the lubricant is not easy to layer or precipitate in the mixing and curing process, and the segregation of the lubricant and the integral material can be avoided.
2. The lubricant core material is a high-temperature solid core material, is in a solid state within the temperature range of room temperature to 140 ℃, and is embedded in the moving part material, so that the friction interface worn by the moving part material has a lubricating effect at all times, and the effect similar to 'taking while using or taking along while using' is achieved.
3. According to the invention, the core-shell lubricant is added into the MC nylon material, so that the self-lubricating property of the MC nylon material is effectively improved, the friction coefficient is reduced, and the wear resistance is improved.
4. The core-shell structure lubricant obtained by the invention has high melting temperature, so that the lubricant belongs to solid lubrication at normal temperature, can not generate oil stains on the friction surface, and can be suitable for vacuum or oil-free working conditions.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 shows the preparation process of the present invention.
FIG. 2 shows the OPE @ SiO of the present invention 2 The mechanism of formation of (1).
FIG. 3 shows the preparation of OPE @ SiO 2 Particle morphology.
Detailed Description
The core-shell structure lubricant is prepared by using Oxidized Polyethylene (OPE) as a core material and nano silicon dioxide (SiO) 2 ) Core-shell structure OPE @ SiO made of shell material 2 A nanoparticle lubricant.
As shown in figure 1, the specific preparation method comprises the following steps:
preparation of polyethylene Oxide (OPE) 200g and polyethylene block polyethylene glycol (PE) 51gbPEG), heating to 140 +/-2 ℃ until the mixture is completely melted into a transparent colorless melt; OPE and PE-bPEG is analytical grade.
Heating 4g of dimethylbenzene to 140 +/-2 ℃ in a reflux device, adding the dimethylbenzene into a melt, adding 2000g of analytical tetraethyl orthosilicate (TEOS) when the temperature is heated to 140-145 ℃, heating, and keeping the temperature at 140-145 ℃.
Thirdly, 80g of the pH regulator which is heated to be boiling is rapidly added into the mixed solution obtained in the second step for reaction, and the reaction is carried out after the reaction is finishedNaturally cooling the solution, and continuously stirring for 12 h to form a core-shell structure OPE @ SiO 2 And (4) mixing the solution.
Wherein: the pH regulator is 5mL of absolute ethyl alcohol and 3mL of NH 3 And (3) uniformly mixing 25-28 wt.% of ammonium hydroxide solution to obtain a mixed solution. Both absolute ethanol (EtOH) and ammonium hydroxide solution were analytical grade.
Fourth is with nucleocapsid structure OPE @ SiO 2 Drying the mixed solution at 80 +/-2 ℃ for 5h, then centrifugally cleaning for three times, and cleaning at 6000 rpm (20 minutes) each time to obtain the core-shell structure OPE @ SiO 2 A nanoparticle lubricant.
The core-shell structure OPE @ SiO obtained by the invention 2 The mechanism of formation of the nanoparticle lubricant is shown in fig. 2. Based on the sol-gel principle, in a xylene solvent, the polyethylene end of the polyethylene block polyethylene glycol of the surfactant has chemical compatibility with oxidized polyethylene, ethyl orthosilicate and xylene, and the polyethylene end has compatibility with water and ethanol, so that the oxidized polyethylene and the ethyl orthosilicate are limited inside the liquid drop to form a micelle, the ethyl orthosilicate is hydrolyzed and condensed at the interface of the liquid drop to form a silicon dioxide shell, meanwhile, the oxidized polyethylene liquid drop is crosslinked to form an inner core, and the ethyl orthosilicate is diffused from inside to outside in the micelle along with the hydrolysis and condensation reaction to finally form an outer shell.
The core-shell structure OPE @ SiO obtained by the invention 2 The nanoparticle lubricant was tested by transmission electron microscopy and a thin layer of silica shell and solid oxidized polyethylene wax inside was seen (as shown in figure 3).
The application of a core-shell structure lubricant in MC nylon: the core-shell structure OPE @ SiO 2 The nano-particle lubricant is added into the monomer, and the self-lubricating MC nylon material is prepared through anionic polymerization.
The prepared core-shell material is centrifugally cleaned, added into a molten long-chain lactam monomer for carrying out anionic polymerization reaction, and subjected to chain extension and crosslinking reaction by using an isocyanate activating agent under the action of a basic catalyst, and a toughening agent and a reinforcing agent are added in the polymerization process, and the reaction, solidification, molding, cooling and demolding are carried out to obtain the core-shell lubricant self-lubricating MC nylon material. The preparation method comprises the following steps:
put the centrifugal mold in a constant temperature oven, set the temperature at 175 ℃, after 1 hour the temperature was constant.
Placing the monomer in a three-necked bottle reaction container, completely melting the monomer at the temperature of 90-130 ℃, vacuumizing to less than-0.08 MPa by using a vacuum pump, and keeping for 20-30 minutes; the monomer is a mixture of Caprolactam (CL) and laurolactam (LL) mixed according to the weight ratio of 1: 1-9: 1.
Thirdly, adding a catalyst accounting for 0.2-4% of the weight of the monomer, continuously vacuumizing to be below-0.08 MPa, keeping the temperature at 120-130 ℃, and keeping the magnetic stirring and vacuum state for 20-30 minutes; the catalyst is organic sodium salt which is sodium methoxide or sodium caprolactam. The organic sodium salt reacts with caprolactam to generate cyclic amide anion, and no water molecule is generated in the catalytic reaction process (see CN 111825974A).
Fourthly, sequentially adding 1 to 15 weight percent of core-shell structure OPE @ SiO into a reaction vessel 2 Continuously vacuumizing the nano-particle lubricant and the toughening agent accounting for 1-15% of the weight of the monomer to be below-0.08 MPa, keeping the temperature at 120-130 ℃, and keeping the magnetic stirring and vacuum state for 20-30 minutes.
The toughening agent is trifunctional polyether amine (PEA), the molecular weight of the toughening agent is 300-6000, and the optimal molecular weight is 2000-5000; the flexible molecular chain in the trifunctional polyether amine (PEA) is mainly polypropylene glycol ether, and the molecular chain structure is as follows:
and fifthly, adding an activating agent accounting for 0.1-2% of the weight of the monomer, quickly dissolving the activating agent, quickly stirring, casting into a centrifugal mold in the step I, keeping the rotating speed of the centrifugal mold at 700-1500 rpm for 20 +/-3 minutes, stopping the rotation of the mold, closing the mold, heating, naturally cooling to room temperature, and taking out the molded part in the mold.
The activating agent is blocked polyisocyanate (C-HDI) or carbodiimide modified aromatic diisocyanate (CI-TDI); the blocked polyisocyanate is mainly caprolactam blocked hexamethylene diisocyanate or HDI biuret; the content of carbodiimide in the carbodiimide-modified aromatic diisocyanate is more than or equal to 12 percent, and the content of isocyanato group (NCO) is more than or equal to 29 percent. The adopted chain extender has good reactivity and aging stability, can be accurately metered, has longer chain extension and crosslinking time and is convenient to operate (see CN 111825974A).
Example 1 application of a core-shell structure lubricant in MC nylon:
put the centrifugal mold in a constant temperature oven, set the temperature at 175 ℃, after 1 hour the temperature was constant.
1800g of Caprolactam (CL) and 200g of laurolactam (LL) solid powder are filled into a 3000ml three-necked bottle reaction vessel, completely melted at 93 ℃, pumped to-0.082 MPa by a vacuum pump, and a magnetic stirrer is opened for 25 minutes.
③ removing vacuum, adding 8.0g of sodium methoxide, continuing to vacuumize to-0.082 MPa at 125 ℃, and keeping the magnetic stirring and vacuum state for 25 minutes.
Fourthly, relieving the vacuum, and adding 20g of flexibilizer (PEA) and 150g of OPE @ SiO 2 Adding the nano-particle lubricant at the same time, continuously vacuumizing to-0.082 MPa at the temperature of 128 ℃, and keeping the magnetic stirring and vacuum state for 23 minutes.
And fifthly, removing the vacuum, adding 2g of activator (C-HDI), quickly casting into a mold after manually shaking the activator particles to disappear, continuously heating the mold for 20 minutes, closing the mold, heating, naturally cooling to room temperature, and demolding and taking out the part.
The product was processed into test specimens and subjected to conditioning treatment according to GB/T2918 for performance testing, the results are shown in Table 1.
TABLE 1 test results
Example 2 application of a core-shell structure lubricant in MC nylon:
put the centrifugal mold in a constant temperature oven, set the temperature at 175 ℃, after 1 hour the temperature was constant.
② 1000g of Caprolactam (CL) and 1000g of laurolactam (LL) solid powder are filled into a 3000ml three-necked bottle reaction vessel, and are completely melted at 93 ℃, and are pumped to-0.082 MPa by a vacuum pump, and a magnetic stirrer is opened for 25 minutes.
③ removing vacuum, adding 4.0g of sodium methoxide, continuing to vacuumize to-0.082 MPa at 125 ℃, and keeping the magnetic stirring and vacuum state for 25 minutes.
Fourthly, relieving the vacuum, and adding 300g of flexibilizer (PEA) and 20g of OPE @ SiO 2 The nanoparticle lubricant was added simultaneously, vacuum was continued to-0.082 MPa at 128 ℃, and magnetic stirring and vacuum were maintained for 23 minutes.
And fifthly, removing the vacuum, adding 10g of activator (C-HDI), quickly casting into a mold after manually shaking the activator particles to disappear, continuously heating the mold for 20 minutes, closing the mold, heating, naturally cooling to room temperature, and demolding and taking out the part.
The product was processed into test specimens and subjected to conditioning treatment according to GB/T2918 for performance testing, the results are shown in Table 2.
TABLE 2 test results
Example 3 application of a core-shell structure lubricant in MC nylon:
put the centrifugal mold in a constant temperature oven, set the temperature at 175 ℃, after 1 hour the temperature was constant.
1200g of Caprolactam (CL) and 800g of laurolactam (LL) as solid powder are placed in a 3000ml three-necked flask reaction vessel, completely melted at 94 ℃, pumped down to-0.082 MPa by a vacuum pump, and the magnetic stirrer is opened for 25 minutes.
③ removing vacuum, adding 8.0g of sodium methoxide, continuing to vacuumize to-0.082 MPa at 125 ℃, and keeping the magnetic stirring and vacuum state for 25 minutes.
Fourthly, relieving the vacuum, and adding 180g of flexibilizer (PEA) and 300g of OPE @ SiO 2 Adding the nano-particle lubricant at the same time, continuously vacuumizing to-0.082 MPa at the temperature of 126 ℃, and keeping the magnetic stirring and vacuum state for 25 minutes.
And fifthly, removing the vacuum, adding 4g of activator (C-HDI), quickly casting into a mold after manually shaking the activator particles to disappear, continuously heating the mold for 20 minutes, closing the mold, heating, naturally cooling to room temperature, and demolding and taking out the part.
The product was processed into test specimens and subjected to conditioning treatment according to GB/T2918 for performance testing, the results are shown in Table 3.
TABLE 3 test results
Example 4 application of a core-shell structure lubricant in MC nylon:
put the centrifugal mold in a constant temperature oven, set the temperature at 175 ℃, after 1 hour the temperature was constant.
② 700g of Caprolactam (CL) and 1300g of laurolactam (LL) solid powder are filled into a 3000ml three-necked bottle reaction vessel, and are completely melted at 93 ℃, and are pumped to-0.082 MPa by a vacuum pump, and a magnetic stirrer is opened for 25 minutes.
③ removing vacuum, adding 8.0g of sodium methoxide, continuing to vacuumize to-0.082 MPa at 125 ℃, and keeping the magnetic stirring and vacuum state for 25 minutes.
Fourthly, the vacuum is relieved, and 50g of toughener (PEA) and 200g of OPE @ SiO 2 Adding the nano-particle lubricant at the same time, continuously vacuumizing to-0.082 MPa at the temperature of 126 ℃, and keeping the magnetic stirring and vacuum state for 25 minutes.
And fifthly, removing the vacuum, adding 40g of activator (C-HDI), quickly casting into a mold after manually shaking the activator particles to disappear, continuously heating the mold for 20 minutes, closing the mold, heating, naturally cooling to room temperature, and demolding and taking out the part.
The product was processed into test specimens and subjected to conditioning treatment according to GB/T2918 for performance testing, the results of which are shown in Table 4.
TABLE 4 test results
Claims (9)
1. A core-shell structure lubricant is characterized in that: the lubricant is core-shell structure OPE @ SiO prepared by taking oxidized polyethylene as a core material and nano silicon dioxide as a shell material 2 A nanoparticle lubricant; the preparation method comprises the following steps:
the preparation method comprises the following steps of mixing oxidized polyethylene and polyethylene block polyethylene glycol according to a ratio of 200: 51, and heating to 140 +/-2 ℃ until the mixture is completely melted into a transparent and colorless melt;
heating dimethylbenzene to 140 +/-2 ℃ in a reflux device, and then adding the dimethylbenzene into the melt; adding analytical grade tetraethyl orthosilicate when the temperature is heated to 140-145 ℃, then heating and raising the temperature, and keeping the temperature at 140-145 ℃; the weight ratio of the xylene to the melt is 4: 251; the weight ratio of the tetraethyl orthosilicate to the melt is 2000: 251;
Thirdly, a pH regulator which is heated to be boiling is rapidly added into the mixed solution obtained in the second step for reaction, the reaction solution is naturally cooled after the reaction is finished, and the core-shell structure OPE @ SiO is formed after continuous stirring for 12 hours 2 Mixing the solution; the addition amount of the pH regulator is 4% of the weight of the tetraethoxysilane;
fourth, the core-shell structure OPE @ SiO 2 Drying and centrifugally cleaning the mixed solution to obtain the core-shell structure OPE @ SiO 2 A nanoparticle lubricant.
2. The core-shell structured lubricant according to claim 1, wherein: the pH regulator in the step three is absolute ethyl alcohol and NH 3 25-28 wt.% ammonium hydroxide solution according to a weight ratio of 5: 3, and uniformly mixing the obtained mixed solution.
3. The use of a core-shell structured lubricant according to claim 1 in MC nylon, wherein: the core-shell structure OPE @ SiO 2 The nano-particle lubricant is added into the monomer, and the self-lubricating MC nylon material is prepared through anionic polymerization.
4. The use of a core-shell structured lubricant according to claim 3 in MC nylon, wherein: the preparation method of the self-lubricating MC nylon material comprises the following steps:
putting the centrifugal mold in a constant-temperature oven, setting the temperature to be 175 ℃, and keeping the temperature constant after 1 hour;
Placing the monomer in a three-mouth bottle reaction container, completely melting the monomer at the temperature of 90-130 ℃, vacuumizing to less than-0.08 MPa by using a vacuum pump, and keeping the temperature for 20-30 minutes;
thirdly, adding a catalyst accounting for 0.2-4% of the weight of the monomer, continuously vacuumizing to be below-0.08 MPa, keeping the temperature at 120-130 ℃, and keeping the magnetic stirring and vacuum state for 20-30 minutes;
fourthly, sequentially adding 1 to 15 weight percent of core-shell structure OPE @ SiO into a reaction vessel 2 Continuously vacuumizing a nanoparticle lubricant and a toughening agent accounting for 1-15% of the weight of the monomer to be below-0.08 MPa, keeping the temperature at 120-130 ℃, and keeping the magnetic stirring and vacuum state for 20-30 minutes;
and fifthly, adding an activating agent accounting for 0.1-2% of the weight of the monomer, quickly dissolving the activating agent, quickly stirring, casting into a centrifugal mold in the step I, keeping the rotating speed of the centrifugal mold at 700-1500 rpm for 20 +/-3 minutes, stopping the rotation of the mold, closing the mold, heating, naturally cooling to room temperature, and taking out the molded part in the mold.
5. The use of a core-shell structured lubricant according to claim 4 in MC nylon, wherein: the monomer in the step II is a mixture of caprolactam and laurolactam according to the weight ratio of 1: 1-9: 1.
6. The use of a core-shell structure lubricant according to claim 4 in MC nylon, wherein: the catalyst in the step (III) is organic sodium salt, and the organic sodium salt is sodium methoxide or sodium caprolactam.
7. The use of a core-shell structured lubricant according to claim 4 in MC nylon, wherein: the toughening agent in the fourth step is trifunctional polyether amine, and the molecular weight of the toughening agent is 300-6000; the flexible molecular chain structure in the trifunctional polyether amine is as follows:
8. the use of a core-shell structured lubricant according to claim 7 in MC nylon, wherein: the molecular weight of the trifunctional polyether amine is 2000-5000.
9. The use of a core-shell structured lubricant according to claim 4 in MC nylon, wherein: the activating agent in the fifth step is blocked polyisocyanate or carbodiimide modified aromatic diisocyanate; the blocked polyisocyanate is caprolactam blocked hexamethylene diisocyanate or HDI biuret; the content of the carbodiimide in the carbodiimide-modified aromatic diisocyanate is more than or equal to 12 percent, and the content of the isocyanato group is more than or equal to 29 percent.
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