CN115746551B - High temperature resistant self-lubricating motor bearing holder - Google Patents
High temperature resistant self-lubricating motor bearing holder Download PDFInfo
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a high-temperature-resistant self-lubricating motor bearing retainer, and relates to the technical field of plastic bearing retainers. The invention discloses a high-temperature-resistant self-lubricating motor bearing retainer which is prepared from a polyamide-based composite material and is prepared from the following raw materials: PA46/MPS matrix, surface modified halloysite nanotube, hyperbranched epoxy resin, composite dispersant, nucleating agent and lubricant; the PA46/MPS matrix is prepared by pre-treating mesoporous silica with a silane coupling agent and then compounding the mesoporous silica with PA 46; the mesoporous silica is an amino mesoporous silica nanoparticle. The high-temperature-resistant self-lubricating motor bearing retainer provided by the invention has high strength and toughness, excellent wear resistance, dimensional stability and water resistance, and the long-term working temperature can reach 200 ℃; the material contains a hollow pipe cavity and a penetrating nanoscale pore canal, so that a solid or liquid lubricant can infiltrate into the PA 46-based composite material, the material has good lubrication retention, the service life of the retainer is prolonged, and the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of plastic bearing retainers, and particularly relates to a high-temperature-resistant self-lubricating motor bearing retainer.
Background
The driving motor is a key part of the new energy electric automobile, compared with the traditional automobile, the rotating speed of the driving motor of the new energy electric automobile is higher, the rotating speed can reach 16000r/min, the retainer surrounds the bearing rollaway nest, the balls are isolated and positioned at almost the same intervals, the retainer bears great centrifugal force, impact and vibration when the rolling bearing works, particularly when the load is complex and the rolling bearing rotates at a high speed, great sliding friction exists between the retainer and the rolling body, a great amount of heat is generated, the retainer is damaged as a result of the combined action of the force and the heat, and the retainer is burnt and broken when serious. Therefore, the cage material is required to have the characteristics of high strength, high toughness, high temperature resistance, corrosion resistance, good wear resistance, good thermal conductivity, light weight, good self-lubricating property and the like.
The cage can be classified into a metallic cage and a non-metallic cage according to the kind of material. The metal retainer is commonly used as a steel retainer and a brass retainer, the steel retainer has light weight, high strength, no limit of operating temperature, high-end shock resistance and acceleration resistance, but is sensitive to poor lubrication, and the selectivity of lubricant is higher; the brass retainer has extremely high strength, high shockproof and acceleration resistance, suitability for ultrahigh-speed operation related to circulating oil lubrication, but expensive raw materials and high cost. The nonmetallic material holder is lightweight, low in noise, and resistant to wear due to its porous structure, and is used as an oil reservoir (lubricating oil storage), and the nonmetallic holders commonly used are: polyimide, polyamideimide, polyetheretherketone, vespelTM, meldinTM, polyamide resin, phenolic resin and polytetrafluoroethylene. Polyimide, polyamide-imide, polyether-ether-ketone, vespel and MeldinTM are used as retainer materials, and have high strength, wear resistance and self-lubricity, the use temperature can reach 300 ℃, but the melting point is high, the molding is difficult, the die pressing sintering is generally adopted, the production process is complex, the cost is high, and the raw material cost is high. The phenolic resin has light weight, good wear resistance, good dimensional stability, long-term working temperature up to 120 ℃, but has higher toughness, easy fracture, poor alkali resistance and low molding productivity. The polytetrafluoroethylene retainer has excellent wear resistance, self-lubricating property and weather resistance, but has low heat conductivity coefficient, the thick-wall product cannot be quenched, the expansion coefficient is 10-20 times that of steel, the temperature is easy to change, the dimensional stability is poor, and the service life of the bearing is influenced. The polyamide material has the advantages of high elasticity and light weight, and the retainer has very good sliding and self-lubricating properties, but toughness is affected by temperature, and the water absorption rate is higher, so that the retainer is dehydrated in the use process, is easy to become brittle, and affects the use effect and service life.
The PA46 retainer is aliphatic polyamide formed by condensing butanediamine and adipic acid, and has a molecular structure similar to nylon 66, but the number of amide groups on a PA46 long chain is more, and the chain structure is more symmetrical; the highly symmetrical chain structure results in high crystallinity (about 70%), high crystallization rate, high heat distortion temperature, and long-term use temperature up to 163 ℃. The PA46 also has the characteristics of high strength, high wear resistance and the like, and has better mechanical strength and wear resistance at heat resistance and high temperature, but has larger water absorption and poorer dimensional stability, and influences the use of products.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant self-lubricating motor bearing retainer which is prepared from a PA 46-based composite material, has high strength and toughness, excellent wear resistance, self-lubricating property, dimensional stability and water resistance, and can be used for long-term working at the temperature of up to 200 ℃; the PA 46-based composite material contains a hollow pipe cavity and a penetrating nanoscale pore canal, so that a solid or liquid lubricant can infiltrate into the PA 46-based composite material, the self-lubricity of the retainer is improved, the retainer has good lubrication retention, the wear resistance of the retainer is enhanced, the service life of the retainer is prolonged, and the cost is reduced.
In order to achieve the purpose of the invention, the invention provides a high-temperature-resistant self-lubricating motor bearing retainer which is prepared from a polyamide-based composite material, wherein the polyamide-based composite material comprises the following raw materials in parts by weight: 60-85 parts of PA46/MPS matrix, 10-30 parts of surface modified halloysite nanotube, 5-10 parts of hyperbranched epoxy resin, 3-5 parts of composite dispersing agent, 0.3-0.5 part of nucleating agent and 1-2 parts of lubricant;
the PA46/MPS matrix is prepared by pretreating mesoporous silica by a silane coupling agent and then compounding the mesoporous silica with PA 46;
the mesoporous silica is an amino mesoporous silica nanoparticle.
Further, the preparation method of the PA46/MPS matrix comprises the following steps: and (3) placing mesoporous silica into deionized water, uniformly mixing, adding a silane coupling agent, stirring for 1-2 hours, adding PA46, heating to 70-80 ℃, stirring for reacting for 2-3 hours, filtering, and drying to obtain the PA46/MPS matrix.
Further, the usage amount of the deionized water is 2 times of the mass of the mesoporous silica;
the silane coupling agent is silane coupling agent KH-792, and the mass ratio of the silane coupling agent to the mesoporous silica is (0.3-0.5): 1, a step of;
the mass ratio of the PA46 to the mesoporous silica is 1: (0.05-0.08).
Further, the preparation method of the surface modified halloysite nanotube comprises the following steps: immersing halloysite nanotubes in 8wt% dilute hydrochloric acid, stirring for 30-40 min, and then filtering, washing and drying to obtain pretreated halloysite nanotubes; and (3) placing the pretreated halloysite nanotube in a high-speed kneader, spraying liquid paraffin and a titanate coupling agent KR-TTS with the mass ratio of 2:1 under high-speed stirring, heating to 60-70 ℃, and continuously stirring for 15-20 min to obtain the surface modified halloysite nanotube.
Further, the adding amount of the titanate coupling agent KR-TTS is 0.5-1.0% of the mass of the pretreated halloysite nanotube.
Further, the hyperbranched epoxy resin is hyperbranched epoxy resin HyPer E102 provided by Wuhan hyperbranched resin technology Co.
Further, the composite dispersing agent comprises the following components in percentage by mass: the polyethylene wax is compounded with 1 ethylene bis stearamide.
Further, the nucleating agent is Licom Cav102 of Craien or P22 of Bulgerman.
Further, the lubricant is a hyperbranched polymer, and is any one of HBP-160, hyPer C100, hyPer C181 or HyPer C182 provided by Wuhan hyperbranched resin technology Co.
The invention also provides a preparation method of the high-temperature-resistant self-lubricating motor bearing retainer, which comprises the following steps:
p1, weighing required raw materials according to parts by weight, adding a PA46/MPS matrix and hyperbranched epoxy resin into a mixer, stirring at a high speed for 3-5 min, wherein the stirring speed is 360r/min, heating to 50-60 ℃, adding a surface modified halloysite nanotube and a composite dispersing agent, stirring at a high speed for 5-8 min, and stirring at a speed of 360r/min to obtain a mixture;
p2, uniformly mixing the mixture, the nucleating agent and the lubricant, adding the mixture into a screw extruder, setting the temperature of the screw extruder to 260-290 ℃, extruding and granulating to obtain a polyamide-based composite material, and then carrying out injection molding on the granules, wherein the injection temperature is set to 270-300 ℃, thus obtaining the required high-temperature-resistant self-lubricating motor bearing retainer.
The invention has the following beneficial effects:
1. according to the invention, the PA46/MPS (mesoporous silica) composite material is adopted as a matrix of the retainer, MPS is placed in deionized water and uniformly mixed, then a silane coupling agent is added, so that the hydrolyzed silane coupling agent is combined with the MPS, silane modification is carried out on the surface of the MPS, the surface activity of the MPS is not easy to agglomerate, the interfacial binding force of the MPS and the PA46 is improved, the PA46 is added, the silane modified MPS is combined with the PA46, meanwhile, the specific surface area of the PA46/MPS composite material is increased, and the PA46/MPS composite material is better compatible with components such as surface modified halloysite nanotubes, hyperbranched epoxy resin, composite dispersing agents and the like, so that the mechanical strength, wear resistance, self-lubricating property and long-term use temperature of the polyamide composite material are improved, and the polyamide composite material has high toughness and excellent processing performance and the processing temperature is not influenced. The mesoporous silica is added, so that the polyamide-based composite material contains a large number of penetrating nanoscale pore channels, the specific surface area and the adsorptivity of the retainer are increased, and therefore, solid or liquid lubricant can be soaked into the penetrating pore channels of the polyamide composite material, and the self-lubricity of the bearing retainer is improved; the adsorption of mesoporous silica also makes the adsorbed lubricant not easy to separate out, so that the lubricant has better lubrication retention.
2. The halloysite nanotube is of a hollow tubular structure with high length-diameter ratio, the inner cavity of the nanotube is mainly aluminum hydroxyl, the outer part of the nanotube is mainly siloxane, and a small amount of silicon hydroxyl and aluminum hydroxyl are exposed at the edge, so that the nanotube has excellent adsorptivity and catalytic activity. According to the invention, the halloysite nanotube is firstly treated by dilute hydrochloric acid, impurities in the inner cavity of the nanotube are removed, the porosity of the halloysite nanotube is increased, the specific surface and the adsorptivity of the halloysite nanotube are improved, then the pretreated halloysite nanotube is subjected to surface modification by adopting a diluted titanic acid coupling agent, the surface activity of the halloysite nanotube is increased, the interfacial binding force of the halloysite nanotube and each component in the polyamide-based composite material is improved, so that the PA46/MPS matrix can be better compatible, the mechanical strength, the high temperature resistance and the wear resistance of the polyamide-based composite material are further improved, and the solid or liquid lubricant can be impregnated into the pores of the polyamide-based composite material, so that the self-lubricating property of the bearing retainer is improved. The excellent adsorptivity of the surface modified halloysite nanotube also makes the adsorbed lubricant not easy to separate out, so that the surface modified halloysite nanotube has better lubrication retention.
3. The hyperbranched epoxy resin HyPer E102 added in the invention has low viscosity, high epoxy value and high activity, and improves the strength and toughness of the polyamide-based composite material; the hyperbranched epoxy resin has high activity, so that other components in the polyamide-based composite material are easy to combine, the waterproof property of the composite material is improved, and the water absorption rate of the composite material is reduced; the hyperbranched epoxy resin has low viscosity and high epoxy value, improves the processing performance of the invention, reduces the processing temperature of the invention and saves the cost.
4. The dispersing agent is prepared by compounding Ethylene Bis Stearamide (EBS) and polyethylene wax. The EBS is a dispersant containing polar groups and nonpolar groups, has excellent dispersant on organic polymers or inorganic fillers, and has synergistic effect with polyethylene wax, so that the dispersibility of each component in the polyamide-based composite material is greatly improved, the components are uniformly dispersed, the strength of the polyamide-based composite material is improved to a certain extent, the compatibility between a PA46/MPS matrix and other components is improved, and the mechanical property of the PA 46-based composite material is improved.
5. The lubricant disclosed by the invention is a hyperbranched polymer and has good thermal stability and migration resistance. The addition of the lubricant obviously improves the processing performance of the invention, improves the dispersing agent of each component in the polyamide-based composite material, increases the compatibility between each component and the PA46/MPS matrix, and improves the long-term use temperature of the invention.
6. The invention adopts PA46/MPS composite material as a matrix, and adopts the surface modified halloysite nanotube, hyperbranched epoxy resin, composite dispersant, lubricant and the like to carry out modification, thus preparing the high-temperature resistant self-lubricating motor bearing retainer adopting the polyamide composite material, which has excellent wear resistance, self-lubricating property, dimensional stability and water resistance, and the working temperature can reach 200 ℃ at most. The polyamide-based composite material also has better self-lubricating retention, enhances the wear resistance of the retainer, prolongs the service life of the retainer and reduces the production cost.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The amino mesoporous silica nanoparticle used in the invention is provided by Nanjing-based biotechnology Co., ltd, and has a particle size of 300nm.
The lubricant used in the invention is hyperbranched polymer, which is provided by the Wuhan hyperbranched resin technology Co., ltd.
The hyperbranched epoxy resin used in the invention is hyperbranched epoxy resin HyPer E102 provided by Wuhan hyperbranched resin technology Co.
The titanate coupling agent KR-TTS used in the present invention is produced by Kenrich Petroleum Inc. in U.S.A.
The halloysite nanotube used in the invention is provided by Nanjing Xianfeng nano material science and technology Co., ltd, and the model is XFI50.
The PA46 in the present embodiment uses TS350 from desiman, netherlands.
The nucleating agent in the embodiment of the invention uses the P22 of Bulgerman, and can also be replaced by Licom Cav102 of Craien.
The high temperature resistant self-lubricating motor bearing retainer of the present invention is described below with reference to specific embodiments.
The high-temperature-resistant self-lubricating motor bearing retainer is prepared by injection molding of a polyamide-based composite material, and the injection temperature is 270-300 ℃.
Example 1
A preparation method of the polyamide-based composite material comprises the following steps: adding 60 parts of PA46/MPS matrix and 30 parts of hyperbranched epoxy resin into a mixer, stirring at a high speed for 4min, heating to 50 ℃, adding 30 parts of surface modified halloysite nanotubes and 5 parts of composite dispersing agent, and stirring at a high speed for 8min, wherein the stirring speed is 360r/min to obtain a mixture; and (3) uniformly mixing the mixture, 0.3 part of nucleating agent and 1 part of lubricant, adding the mixture into a screw extruder, setting the temperature of the screw extruder to 260-290 ℃, and extruding and granulating to obtain the polyamide-based composite material.
The preparation method of the PA46/MPS matrix comprises the following steps: according to the weight portions, 5 portions of mesoporous silica are placed in 10 portions of deionized water to be uniformly mixed, then 1.5 portions of silane coupling agent KH-792 is added, stirring is carried out for 2 hours, 100 portions of PA46 are added, heating is carried out to 80 ℃, stirring is carried out for 2 hours, filtering is carried out, and drying is carried out, thus obtaining the PA46/MPS matrix.
The preparation method of the surface modified halloysite nanotube comprises the following steps: immersing 100 parts of halloysite nanotubes in 8wt% of dilute hydrochloric acid, stirring for 30min, and then filtering, washing and drying to obtain pretreated halloysite nanotubes; and (3) placing the pretreated erloting nanotube in a high-speed kneader, spraying 1 part of liquid paraffin and 0.5 part of titanate coupling agent KR-TTS in a mist manner under high-speed stirring, and heating to 70 ℃ and continuously stirring for 15min to obtain the surface modified halloysite nanotube.
The lubricant is HBP-160 provided by Wuhan hyperbranched resin technology Co.
Example 2
A preparation method of the polyamide-based composite material comprises the following steps: according to parts by weight, 85 parts of PA46/MPS matrix and 10 parts of hyperbranched epoxy resin are added into a mixer, the mixture is stirred at a high speed for 5min, the stirring speed is 360r/min, the temperature is raised to 60 ℃, 10 parts of surface modified halloysite nanotubes and 3 parts of composite dispersing agent are added, the mixture is stirred at a high speed for 8min, and the stirring speed is 360r/min, so that a mixture is obtained; and (3) uniformly mixing the mixture, 0.5 part of nucleating agent and 1 part of lubricant, adding the mixture into a screw extruder, setting the temperature of the screw extruder to 260-290 ℃, and extruding and granulating to obtain the polyamide-based composite material.
The preparation method of the PA46/MPS matrix comprises the following steps: according to the parts by weight, placing 8 parts of mesoporous silica into 16 parts of deionized water, uniformly mixing, adding 4 parts of silane coupling agent KH-792, stirring for 1h, adding 100 parts of PA46, heating to 70 ℃, stirring for 4h, filtering, and drying to obtain the PA46/MPS matrix.
The preparation method of the surface modified halloysite nanotube comprises the following steps: immersing 100 parts of halloysite nanotubes in 8wt% of dilute hydrochloric acid, stirring for 30min, and then filtering, washing and drying to obtain pretreated halloysite nanotubes; and (3) placing the pretreated erloting nanotube in a high-speed kneader, spraying 2 parts of liquid paraffin and 1 part of titanate coupling agent KR-TTS in a mist manner under high-speed stirring, and heating to 70 ℃ and continuing stirring for 15min to obtain the surface modified halloysite nanotube.
The lubricant is HyPer C181 provided by Wuhan hyperbranched resin technology Co.
Example 3
A preparation method of the polyamide-based composite material comprises the following steps: adding 65 parts of PA46/MPS matrix and 5 parts of hyperbranched epoxy resin into a mixer, stirring at a high speed for 5min, wherein the stirring speed is 360r/min, heating to 60 ℃, adding 30 parts of surface modified halloysite nanotubes and 5 parts of composite dispersing agent, and stirring at a high speed for 8min, wherein the stirring speed is 360r/min to obtain a mixture; and (3) uniformly mixing the mixture, 0.3 part of nucleating agent and 2 parts of lubricant, adding the mixture into a screw extruder, setting the temperature of the screw extruder to 260-290 ℃, and extruding and granulating to obtain the polyamide-based composite material.
The preparation method of the PA46/MPS matrix comprises the following steps: and (3) placing 6 parts of mesoporous silica into 12 parts of deionized water according to parts by weight, uniformly mixing, adding 2.5 parts of silane coupling agent KH-792, stirring for 2 hours, adding 100 parts of PA46, heating to 60 ℃, stirring for 4 hours, filtering, and drying to obtain the PA46/MPS matrix.
The preparation method of the surface modified halloysite nanotube comprises the following steps: immersing 100 parts of halloysite nanotubes in 8wt% of dilute hydrochloric acid, stirring for 30min, and then filtering, washing and drying to obtain pretreated halloysite nanotubes; and placing the pretreated erloting nanotube in a high-speed kneader, spraying 1.6 parts of liquid paraffin and 0.8 part of titanate coupling agent KR-TTS under high-speed stirring, heating to 70 ℃ and continuously stirring for 15min to obtain the surface modified halloysite nanotube.
The lubricant is HyPer C182 provided by Wuhan hyperbranched resin technology Co.
Example 4
A preparation method of the polyamide-based composite material comprises the following steps: adding 75 parts of PA46/MPS matrix and 5 parts of hyperbranched epoxy resin into a mixer, stirring at a high speed for 5min, heating to 60 ℃, adding 20 parts of surface modified halloysite nanotubes and 4 parts of composite dispersing agent, and stirring at a high speed for 8min, wherein the stirring speed is 360r/min to obtain a mixture; and (3) uniformly mixing the mixture, 0.4 part of nucleating agent and 2 parts of lubricant, adding the mixture into a screw extruder, setting the temperature of the screw extruder to 260-290 ℃, and extruding and granulating to obtain the polyamide-based composite material.
The preparation method of the PA46/MPS matrix is the same as that in example 3, and specific reference is made to example 3.
The preparation method of the surface-modified halloysite nanotube is the same as that of example 3, and specific reference is made to example 3.
The lubricant is HyPer C100 provided by Wuhan hyperbranched resin technology Co.
Example 5
A preparation method of the polyamide-based composite material comprises the following steps: adding 70 parts of PA46/MPS matrix and 8 parts of hyperbranched epoxy resin into a mixer, stirring at a high speed for 5min, heating to 60 ℃, adding 22 parts of surface modified halloysite nanotubes and 4 parts of composite dispersing agent, and stirring at a high speed for 8min, wherein the stirring speed is 360r/min to obtain a mixture; uniformly mixing the mixture, 0.35 part of nucleating agent and 1.5 parts of lubricant, adding the mixture into a screw extruder, setting the temperature of the screw extruder to 260-290 ℃, and extruding and granulating to obtain the polyamide-based composite material.
The preparation method of the PA46/MPS matrix is the same as that in example 3, and specific reference is made to example 3.
The preparation method of the surface-modified halloysite nanotube is the same as that of example 3, and specific reference is made to example 3.
The lubricant is HBP-160 provided by Wuhan hyperbranched resin technology Co.
Comparative example 1
A polyamide-based composite material was prepared in the same manner as in example 5, except that the PA46/MPS matrix was not added but 70 parts of PA46 was added in comparative example 1.
Comparative example 2
A polyamide-based composite material was the same as in example 5 in composition, raw materials and preparation method, except that no surface-modified halloysite nanotube was added in comparative example 2, and 92 parts of PA46/MPS matrix was added.
Comparative example 3
The composition, raw materials and preparation method of the polyamide-based composite material are the same as those in example 5, except that hyperbranched epoxy resin is not added in comparative example 3, 78 parts of PA46/MPS matrix are added, and the temperature of a screw extruder is 270-300 ℃.
Comparative example 4
A polyamide-based composite material was prepared in the same manner as in example 5, except that the dispersant in comparative example 4 was 4 parts of Ethylene Bis Stearamide (EBS).
Comparative example 5
A polyamide-based composite material was prepared in the same manner as in example 5, except that the lubricant in comparative example 5 was oleamide and the temperature of the screw extruder was 280 to 310 ℃.
The polyamide-based composite materials obtained in examples 1 to 5 and comparative examples 1 to 5 were subjected to performance test, and the test results are shown in tables 1 to 2 below.
The detection method comprises the following steps:
the water absorption test method refers to GB/T1034-2008, and soaking is carried out for 24+/-1 h at the temperature of 23 ℃;
the tensile stress test method is tested with reference to ISO 572-2-2012 at 120 ℃;
the tensile modulus test method was tested with reference to ISO 572-2-2012 at 120 ℃; the method comprises the steps of carrying out a first treatment on the surface of the
The notch impact strength test method refers to ISO 180-2000;
the linear thermal expansion coefficient test method is tested by referring to ISO 11359-2-1999;
the glass transition temperature test method is tested with reference to ASTM D3418-08;
the shrinkage test method is carried out according to GB/T15585-1995;
the coefficient of friction test method was examined with reference to GB/T10006-1998.
Table 1 shows the results of the Performance test of the Polyamide-based composite materials of examples 1 to 5
TABLE 2 Polyamide-based composite Performance test results Table for example 5 and comparative examples 1-5
From the detection results in tables 1 and 2, the addition of mesoporous silica and modified halloysite nanotubes in the polyamide-based composite material of the invention significantly improves the mechanical strength, toughness, water resistance, high temperature resistance, thermal stability and wear resistance of the invention; the addition of hyperbranched epoxy resin obviously improves the water resistance of the invention; the addition of the lubricant improves the high temperature resistance and the processability of the invention; the ethylene bis stearamide and the polyethylene wax are used in a combined way, so that the comprehensive performance of the invention is improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (2)
1. The high-temperature-resistant self-lubricating motor bearing retainer is prepared from a polyamide-based composite material, and is characterized in that the polyamide-based composite material comprises the following raw materials in parts by weight: 60-85 parts of PA46/MPS matrix, 10-30 parts of surface modified halloysite nanotube, 5-10 parts of hyperbranched epoxy resin HyPer E102, 3-5 parts of composite dispersing agent, 0.3-0.5 part of nucleating agent and 1-2 parts of lubricant;
the preparation method of the PA46/MPS matrix comprises the following steps: uniformly mixing mesoporous silica in deionized water, adding a silane coupling agent, stirring for 1-2 h, adding PA46, heating to 70-80 ℃, stirring for reacting for 2-3 h, filtering, and drying to obtain a PA46/MPS matrix;
the usage amount of the deionized water is 2 times of the mass of the mesoporous silica;
the silane coupling agent is silane coupling agent KH-792, and the mass ratio of the silane coupling agent to the mesoporous silica is (0.3-0.5): 1, a step of;
the mass ratio of the PA46 to the mesoporous silica is 1: (0.05-0.08);
the mesoporous silica is amino mesoporous silica nano-particles;
the preparation method of the surface modified halloysite nanotube comprises the following steps: immersing halloysite nanotubes in 8wt% dilute hydrochloric acid, stirring for 30-40 min, and then filtering, washing and drying to obtain pretreated halloysite nanotubes; placing the pretreated halloysite nanotube in a high-speed kneader, spraying liquid paraffin and titanate coupling agent KR-TTS with the mass ratio of 2:1 under high-speed stirring, heating to 60-70 ℃ and continuously stirring for 15-20 min to obtain the surface modified halloysite nanotube;
the adding amount of the titanate coupling agent KR-TTS is 0.5-1.0% of the mass of the pretreated halloysite nanotube;
the composite dispersing agent comprises the following components in percentage by mass: 1 ethylene bis stearamide and polyethylene wax are compounded;
the nucleating agent is Licom Cav102 of Craien or P22 of Bulgerman;
the lubricant is hyperbranched polymer and is any one of HBP-160, hyPer C100, hyPer C181 or HyPer C182 provided by Wuhan hyperbranched resin technology Co.
2. A method for preparing the high temperature resistant self-lubricating motor bearing retainer as claimed in claim 1, which is characterized by comprising the following steps:
p1, weighing required raw materials according to parts by weight, adding a PA46/MPS matrix and hyperbranched epoxy resin into a mixer, stirring at a high speed for 3-5 min, wherein the stirring speed is 360r/min, heating to 50-60 ℃, adding a surface modified halloysite nanotube and a composite dispersing agent, stirring at a high speed for 5-8 min, and stirring at a speed of 360r/min to obtain a mixture;
p2, uniformly mixing the mixture, the nucleating agent and the lubricant, adding the mixture into a screw extruder, setting the temperature of the screw extruder to 260-290 ℃, extruding and granulating to obtain a polyamide-based composite material, and then carrying out injection molding on the granules, wherein the injection temperature is set to 270-300 ℃, thus obtaining the required high-temperature-resistant self-lubricating motor bearing retainer.
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| CN108976782A (en) * | 2018-06-15 | 2018-12-11 | 湖南工业大学 | A kind of nylon composite materials and preparation method thereof modified based on hyperbranched epoxy resin |
| CN109438975A (en) * | 2018-11-26 | 2019-03-08 | 北京航天试验技术研究所 | A kind of high-strength nylon composite material and preparation method |
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| CN108976782A (en) * | 2018-06-15 | 2018-12-11 | 湖南工业大学 | A kind of nylon composite materials and preparation method thereof modified based on hyperbranched epoxy resin |
| CN109438975A (en) * | 2018-11-26 | 2019-03-08 | 北京航天试验技术研究所 | A kind of high-strength nylon composite material and preparation method |
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