CN115785671A - Aerogel/polyphenylene sulfide self-lubricating friction material and preparation method thereof - Google Patents
Aerogel/polyphenylene sulfide self-lubricating friction material and preparation method thereof Download PDFInfo
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- 229920000069 polyphenylene sulfide Polymers 0.000 title claims abstract description 112
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- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 3
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Abstract
The invention provides an aerogel/polyphenylene sulfide self-lubricating friction material and a preparation method thereof, and relates to the technical field of lubricating materials. The invention mixes the polyphenylene sulfide, aerogel, reinforced fiber and liquid phase auxiliary agent; and melting and extruding the obtained mixture to obtain the aerogel/polyphenylene sulfide self-lubricating friction material. According to the invention, the polyphenylene sulfide is modified through the synergistic compounding of the aerogel with low modulus and high porosity and the reinforced fiber, the mechanical property of the polyphenylene sulfide material is regulated and controlled, and the friction coefficient is reduced; and the liquid-phase auxiliary agent is added to carry out liquid-phase auxiliary melt blending on the raw materials, so that the melt dispersion uniformity of the polyphenylene sulfide matrix and the aerogel is improved, and the strength and the rigidity of the composite material are guaranteed. The aerogel/polyphenylene sulfide self-lubricating friction material prepared by the invention has excellent tribological properties, and can effectively prolong the service life of a lubricating component.
Description
Technical Field
The invention relates to the technical field of lubricating materials, in particular to an aerogel/polyphenylene sulfide self-lubricating friction material and a preparation method thereof.
Background
With the rapid development of lubrication technology, the requirements on antifriction and wear-resistant materials are higher and higher. Many lubricated parts, such as bearings, gears, piston rings and sliding guides, are required to operate at high temperatures, subject to design constraints. Among the polymer matrix materials applied to high-temperature working conditions, polyphenylene sulfide has high mechanical strength, flame retardancy, excellent electrical property and relatively low price, so that the polyphenylene sulfide is widely applied to the fields of electronics, automobiles, machinery and chemical engineering.
However, years of application experience shows that the polyphenylene sulfide modified material is difficult to maintain a long-term effective lubricating effect when being in service under a high-temperature working condition, and the first problem is that the polyphenylene sulfide modified material has insufficient heat resistance stability and frictional wear resistance under the high-temperature working condition. The aerogel has extremely low density, and a large number of holes in the structure can effectively inhibit the heat conduction of gas molecules, so that the aerogel is an ideal heat-insulating material and is expected to improve the heat-resistant stability of the polyphenylene sulfide material. On the one hand, however, while the aerogel improves the heat resistance of the polymer and inhibits heat conduction, the porous structure of the aerogel tends to cause the reduction of the mechanical strength and the frictional wear performance of the composite material; on the other hand, the great density difference between the aerogel and the polyphenylene sulfide leads to that the uniform blending of the aerogel and the polyphenylene sulfide is difficult to realize, and the preparation of the high-performance aerogel/polyphenylene sulfide composite material is difficult in technical means.
Disclosure of Invention
In view of the above, the present invention aims to provide an aerogel/polyphenylene sulfide self-lubricating friction material and a preparation method thereof. The preparation method realizes the preparation of the aerogel/polyphenylene sulfide self-lubricating friction material, and the prepared aerogel/polyphenylene sulfide self-lubricating friction material has high mechanical strength and excellent tribological properties.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of an aerogel/polyphenylene sulfide self-lubricating friction material, which comprises the following steps:
mixing polyphenylene sulfide, aerogel, reinforcing fibers and a liquid-phase auxiliary agent to obtain a mixture;
and carrying out melt extrusion on the mixture to obtain the aerogel/polyphenylene sulfide self-lubricating friction material.
Preferably, the melt density of the polyphenylene sulfide is 1.30 to 1.35g/cm 3 。
Preferably, the aerogel comprises one or more of silica aerogel, zirconium dioxide aerogel and carbon aerogel; the particle size of the aerogel is 10-50 nm, and the porosity is 90-99%.
Preferably, the reinforcing fiber comprises one or more of carbon fiber, glass fiber and aluminum silicate fiber; the average diameter of the reinforced fiber is 2-10 μm, and the length-diameter ratio is 5-30.
Preferably, the mass content of the polyphenylene sulfide is 74-80%, the mass content of the aerogel is 0.5-6%, and the mass content of the reinforcing fiber is 15-25% based on the sum of the mass of the polyphenylene sulfide, the mass of the aerogel and the mass of the reinforcing fiber.
Preferably, the liquid phase adjuvant comprises one or more of methyl silicone oil, ethyl silicone oil and polyether modified silicone oil.
Preferably, the method for mixing the polyphenylene sulfide, the aerogel, the reinforcing fiber and the liquid-phase adjuvant comprises the following steps:
the polyphenylene sulfide and the liquid-phase auxiliary are subjected to first mixing to obtain a first mixture;
carrying out second mixing on the first mixture and the aerogel to obtain a second mixture;
and thirdly mixing the second mixture and the reinforced fibers to obtain the mixture.
Preferably, the melt extrusion is carried out in a double-screw extruder, the extrusion temperature of the melt extrusion is 280-320 ℃, and the screw rotation speed is 30-200 rpm.
Preferably, after the melt extrusion, the method further comprises the steps of sequentially granulating and injection molding the obtained material; the injection molding conditions include: the temperature of the charging barrel is 300-330 ℃, the temperature of the mould is 140-160 ℃, the injection pressure is 30-80 MPa, and the pressure maintaining time is 5-10 s.
The invention provides the aerogel/polyphenylene sulfide self-lubricating friction material prepared by the preparation method in the technical scheme; the friction coefficient of the aerogel/polyphenylene sulfide self-lubricating friction material is 0.15-0.25, and the thermal conductivity at 250 ℃ is 0.36-0.39W/(m.K).
The invention provides a preparation method of a gel/polyphenylene sulfide self-lubricating friction material, which comprises the following steps: mixing polyphenylene sulfide, aerogel, reinforcing fibers and a liquid-phase auxiliary agent to obtain a mixture; and carrying out melt extrusion on the mixture to obtain the aerogel/polyphenylene sulfide self-lubricating friction material. On the basis of keeping excellent heat resistance, strength and rigidity of the polyphenylene sulfide, the polyphenylene sulfide is synergistically modified by aerogel with low heat conduction, low modulus and high porosity and reinforced fibers, the mechanical property of the polyphenylene sulfide material is regulated and controlled, and the friction coefficient of the material is greatly reduced; in addition, the liquid phase auxiliary agent is added to carry out liquid phase auxiliary melting and blending on the raw materials, so that the melting and dispersing uniformity of the polyphenylene sulfide resin matrix and the aerogel can be improved, the uniform dispersion of the extremely-low-density aerogel in the high-viscosity polyphenylene sulfide matrix is realized, the reduction of the friction and wear performance and the overall strength of the composite material caused by local stress concentration due to agglomeration and caking is avoided, and the strength and the rigidity of the composite material are ensured.
The invention provides the aerogel/polyphenylene sulfide self-lubricating friction material prepared by the preparation method in the technical scheme. The aerogel/polyphenylene sulfide self-lubricating friction material provided by the invention has high mechanical strength and excellent tribological performance, is applied to high-end equipment lubrication parts, and can effectively prolong the service life of the lubrication parts.
The embodiment result shows that the thermal conductivity of the aerogel/polyphenylene sulfide self-lubricating friction material prepared by the invention at 250 ℃ is 0.36-0.39W/(m.K), the bending strength is 106.7-122.3 MPa, the compression strength is 99.4-110.8 MPa, and the friction coefficient is 0.15-0.25.
Drawings
FIG. 1 is a bar graph of flexural strength and compressive strength of composite materials prepared in examples 1 to 3 and comparative examples 1 to 2, wherein (a) is a bar graph of flexural strength and (b) is a bar graph of compressive strength in FIG. 1;
FIG. 2 is a microstructure diagram of a tensile section of the composite materials prepared in examples 1 to 3 and comparative examples 1 to 2, wherein (a) to (e) in FIG. 2 correspond to the microstructure diagrams of the tensile section of the composite materials of example 1, example 2, example 3, comparative example 1 and comparative example 2, respectively;
fig. 3 is a histogram of the coefficient of friction and thermal conductivity of the composite materials prepared in examples 1 to 3 and comparative examples 1 to 2, in which (a) is a histogram of the coefficient of friction and (b) is a histogram of the thermal conductivity (room temperature versus 250 ℃).
Detailed Description
The invention provides a preparation method of an aerogel/polyphenylene sulfide self-lubricating friction material, which comprises the following steps:
mixing polyphenylene sulfide, aerogel, reinforcing fibers and a liquid-phase auxiliary agent to obtain a mixture;
and carrying out melt extrusion on the mixture to obtain the aerogel/polyphenylene sulfide self-lubricating friction material.
In the present invention, the starting materials are all commercially available products known to those skilled in the art unless otherwise specified.
According to the invention, polyphenylene sulfide, aerogel, reinforcing fiber and liquid-phase auxiliary agent are mixed to obtain a mixture. In the present invention, the melt density of the polyphenylene sulfide is preferably 1.30 to 1.35g/cm 3 The polyphenylene sulfide is preferably dried before use. In the present invention, the aerogel preferably includes one or more of silica aerogel, zirconia aerogel and carbon aerogel; the grain size of the aerogel is preferably 10-50 nm, more preferably 10-20 nm, and the porosity is preferably 90-99%, more preferably 95-99%; in the embodiment of the present invention, the aerogel is more preferably a silica aerogel, the silica aerogel has the advantages of high specific surface area and low thermal conductivity, and the silica aerogel can form a transfer film to improve the wear resistance of the polymer matrix during the sliding process due to the action of its surface functional groups. In the invention, the reinforcing fiber preferably comprises one or more of carbon fiber, glass fiber and aluminum silicate fiber, and more preferably carbon fiber; the reinforcing fiberThe average diameter of the fibers is preferably 2 to 10 μm, more preferably 6 to 10 μm, and the aspect ratio is preferably 5 to 30, more preferably 10 to 20. In the present invention, the polyphenylene sulfide is contained in an amount of preferably 74 to 80% by mass, more preferably 74 to 78% by mass, and still more preferably 76 to 78% by mass, the aerogel is contained in an amount of preferably 0.5 to 6% by mass, more preferably 2 to 6% by mass, and still more preferably 4 to 6% by mass, and the reinforcing fiber is contained in an amount of preferably 15 to 25% by mass, and still more preferably 15 to 20% by mass, based on the sum of the mass of the polyphenylene sulfide, the aerogel, and the reinforcing fiber (the polyphenylene sulfide, the aerogel, and the reinforcing fiber constitute the friction material). In the invention, the liquid phase adjuvant preferably comprises one or more of methyl silicone oil, ethyl silicone oil and polyether modified silicone oil, and more preferably methyl silicone oil; the liquid phase auxiliary agent plays a role of a dispersing agent and can enhance the uniform dispersibility of the aerogel in the polyphenylene sulfide matrix. The invention has no special requirement on the dosage of the liquid-phase adjuvant, and can ensure that the aerogel is uniformly dispersed in the polyphenylene sulfide matrix; in the embodiment of the present invention, the mass ratio of the liquid phase adjuvant to the aerogel is preferably 1 to 2.5.
In the present invention, the method of mixing the polyphenylene sulfide, the aerogel, the reinforcing fiber, and the liquid-phase adjuvant is preferably:
the polyphenylene sulfide and the liquid-phase auxiliary are subjected to first mixing to obtain a first mixture;
carrying out second mixing on the first mixture and the aerogel to obtain a second mixture;
and carrying out third mixing on the second mixture and the reinforced fibers to obtain the mixture.
According to the invention, the polyphenylene sulfide is preferably dropwise added with the liquid-phase auxiliary agent for first mixing, the first mixing is preferably stirring mixing, and a first mixture with the polyphenylene sulfide and the liquid-phase auxiliary agent uniformly mixed is obtained through the first mixing. According to the invention, preferably, aerogel is added into the first mixture for second mixing, and the second mixing is preferably stirring mixing. According to the invention, the reinforcing fiber is preferably added into the second mixture for third mixing, the third mixing is preferably stirring mixing, no special requirements are required for the speed and time of the third mixing, and the reinforcing fiber can be uniformly dispersed in a mixed system of polyphenylene sulfide and aerogel. The density of the aerogel is extremely low, and the aerogel and the polyphenylene sulfide matrix are often difficult to realize uniform blending due to the density difference between the aerogel and the polyphenylene sulfide matrix.
After the mixture is obtained, the mixture is subjected to melt extrusion to obtain the aerogel/polyphenylene sulfide self-lubricating friction material. In the present invention, the melt extrusion is preferably carried out in a twin-screw extruder, which is not particularly required in the present invention, and a twin-screw extruder well known to those skilled in the art may be used; the extrusion temperature of the melt extrusion is preferably 280 to 320 ℃, more preferably 300 to 310 ℃, and the screw rotation speed is preferably 30 to 200rpm, more preferably 50 to 120rpm. During the melt extrusion, the liquid phase adjuvant added evaporates without affecting the intrinsic properties of the composite.
After the melt extrusion, the invention also preferably carries out granulation and injection molding on the obtained material in sequence. In the invention, the material obtained after the melt extrusion is preferably granulated and then dried; the drying temperature is preferably 110-120 ℃, the time is preferably 3-4 h, and the drying is preferably carried out in a constant-temperature oven. In the present invention, the granulation is specifically performed in a granulator, and the particle size of the granulated material is preferably 0.2 to 0.5cm. The invention has no special requirements on the operation method of the injection molding, and the injection molding operation method which is well known by the technical personnel in the field can be adopted; the conditions for the injection molding preferably include: the cylinder temperature is 300-330 ℃, preferably 310-320 ℃, the die temperature is 140-160 ℃, preferably 140-150 ℃, the injection pressure is 30-80 MPa, preferably 50-80 MPa, and the pressure maintaining time is 5-10 s, preferably 5-8 s. According to the invention, through the accurate control of the injection molding process parameters, the full melting and cooling crystallization rate of the polyphenylene sulfide can be ensured, so that the uniformity of the composite material sample is improved. And after injection molding, obtaining the formed aerogel/polyphenylene sulfide self-lubricating friction material.
The invention provides the aerogel/polyphenylene sulfide self-lubricating friction material prepared by the preparation method in the technical scheme; the friction coefficient of the aerogel/polyphenylene sulfide self-lubricating friction material is 0.15-0.25, and the thermal conductivity at 250 ℃ is 0.36-0.39W/(m.K). The aerogel/polyphenylene sulfide self-lubricating friction material provided by the invention has excellent tribological properties, is applied to a lubricating component, and can effectively prolong the service life of the lubricating component.
The aerogel/polyphenylene sulfide self-lubricating friction material and the preparation method thereof provided by the present invention will be described in detail with reference to the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
The preparation method of the aerogel/polyphenylene sulfide self-lubricating friction material comprises the following steps:
(1) 234g of dried polyphenylene sulfide (melt density 1.35 g/cm) was weighed out 3 ) Placing the mixture in a beaker, dropwise adding liquid phase adjuvant methyl silicone oil, stirring while adding the liquid phase adjuvant, and stopping dropwise adding (15 g of liquid phase adjuvant is added in total) after the liquid phase adjuvant and the polyphenylene sulfide are uniformly mixed;
(2) Adding 6g of silicon dioxide nano aerogel (the particle size is 11nm, the porosity is 97.7%) into the beaker in the step (1), stirring while adding the silicon dioxide nano aerogel, and stopping stirring after the silicon dioxide nano aerogel and the polyphenylene sulfide are uniformly mixed;
(3) Adding 60g of carbon fibers (with the average diameter of 7 microns and the length-diameter ratio of 14) into the beaker in the step (2), stirring, and stopping stirring after the carbon fibers and the polyphenylene sulfide/silicon dioxide nano aerogel are uniformly mixed to obtain a mixed material;
(4) Carrying out double-screw melt extrusion, granulation and injection molding on the mixed material obtained in the step (3) to obtain an aerogel modified polyphenylene sulfide composite material, namely the aerogel/polyphenylene sulfide self-lubricating friction material; wherein the conditions of melt extrusion are as follows: the extrusion temperature is 280-320 ℃, the screw rotation speed is 120rpm, and the injection molding conditions are as follows: the temperature of the charging barrel is 310 ℃, the temperature of the die is 140 ℃, the injection pressure is 80MPa, and the pressure maintaining time is 5s.
Example 2
The preparation method of the aerogel/polyphenylene sulfide self-lubricating friction material comprises the following steps:
(1) 228g of dry polyphenylene sulfide (melt density of 1.35 g/cm) were weighed out 3 ) Placing the mixture into a beaker, dropwise adding liquid phase adjuvant methyl silicone oil, stirring while adding the liquid phase adjuvant, and stopping dropwise adding (adding 18g of the liquid phase adjuvant in total) after the liquid phase adjuvant and the polyphenylene sulfide are uniformly mixed.
(2) Adding 12g of silicon dioxide nano aerogel (the particle size is 11nm, the porosity is 97.7%) into the beaker obtained in the step (1), stirring while adding the silicon dioxide nano aerogel, and stopping stirring after the silicon dioxide nano aerogel and the polyphenylene sulfide are uniformly mixed;
(3) Adding 60g of carbon fibers (with the average diameter of 7 microns and the length-diameter ratio of 14) into the beaker obtained in the step (2), stirring, and stopping stirring after the carbon fibers and the polyphenylene sulfide/silicon dioxide nano aerogel are uniformly mixed to obtain a mixed material;
(4) Extruding, granulating and injection-molding the mixture obtained in the step (3) to obtain an aerogel modified polyphenylene sulfide composite material, namely the aerogel/polyphenylene sulfide self-lubricating friction material, wherein the melt extrusion conditions are as follows: the extrusion temperature is 280-320 ℃, the screw rotation speed is 120rpm, and the injection molding conditions are as follows: the temperature of the charging barrel is 310 ℃, the temperature of the die is 140 ℃, the injection pressure is 80MPa, and the pressure maintaining time is 5s.
Example 3
The preparation method of the aerogel/polyphenylene sulfide self-lubricating friction material comprises the following steps:
(1) 222g of dry polyphenylene sulfide (melt density 1.35 g/cm) was weighed out 3 ) Placing the mixture into a beaker, dropwise adding liquid-phase adjuvant methyl silicone oil, stirring while adding the liquid-phase adjuvant, and stopping dropwise adding (adding 23g of liquid-phase adjuvant altogether) after the liquid-phase adjuvant and the polyphenylene sulfide are uniformly mixed;
(2) Adding 18g of silicon dioxide nano aerogel (the particle size is 11nm, the porosity is 97.7%) into the beaker in the step (1), stirring while adding the silicon dioxide nano aerogel, and stopping stirring after the silicon dioxide nano aerogel and the polyphenylene sulfide are uniformly mixed;
(3) Adding 60g of carbon fibers (with the average diameter of 7 microns and the length-diameter ratio of 14) into the beaker obtained in the step (2), stirring, and stopping stirring after the carbon fibers and the polyphenylene sulfide/silicon dioxide nano aerogel are uniformly mixed to obtain a mixed material;
(4) Extruding, granulating and injection-molding the mixed material obtained in the step (3) to obtain an aerogel modified polyphenylene sulfide composite material, namely the aerogel/polyphenylene sulfide self-lubricating friction material; wherein the melt extrusion conditions are as follows: the extrusion temperature is 280-320 ℃, the screw rotation speed is 120rpm, and the injection molding conditions are as follows: the temperature of the charging barrel is 310 ℃, the temperature of the die is 140 ℃, the injection pressure is 80MPa, and the pressure maintaining time is 5s.
In order to compare the performances of pure polyphenylene sulfide, single carbon fiber modified polyphenylene sulfide composite and aerogel modified polyphenylene sulfide composite, the following comparative experiments were performed:
comparative example 1
Carrying out double-screw melt extrusion, granulation and injection molding on 300g of dried polyphenylene sulfide to obtain a pure polyphenylene sulfide material; wherein the melt extrusion conditions and injection molding conditions were the same as in example 1.
Comparative example 2
Weighing 240g of dry polyphenylene sulfide, placing the polyphenylene sulfide in a beaker, and then uniformly mixing the polyphenylene sulfide with 60g of carbon fiber to obtain a mixed material;
extruding, granulating and injection-molding the mixed material to obtain a carbon fiber/polyphenylene sulfide composite material; wherein the melt extrusion conditions and injection molding conditions were the same as in example 1.
The composite materials obtained in the examples and the comparative examples were subjected to the following performance tests:
(1) Test method
1) Test for Friction Properties
The composite materials obtained in the examples and the comparative examples and 316 stainless steel are matched and tested for friction and wear performance under a pin-disc friction and wear testing machine, the testing temperature is 25 ℃, the load is 6MPa, and the linear velocity is 0.5m/s.
2) Mechanical property and heat conductivity test
Machining the composite material samples obtained in the examples and the comparative examples into strips with the national standard specified size, and testing the mechanical properties on a universal testing machine, wherein the test piece for testing the bending strength is a strip shape with the size of 80mm multiplied by 10mm multiplied by 4mm, and the test piece is measured according to the national standard GB/T9341-2008; the compression test piece is a strip of 10mm × 10mm × 4mm, and is measured according to the national standard GB/T1041-2008.
The composite samples obtained in the examples and comparative examples were prepared as test specimens in the form of circular discs having a diameter of 12.7mm by 2mm, the thermal conductivity being determined with reference to the standard ISO 22007-2, measured at two temperature points, room temperature and 250 ℃.
(2) Test results
1) The flexural strength and the compressive strength of the composites prepared in examples 1 to 3 and comparative examples 1 to 2 were characterized, and the results are shown in fig. 1, in which (a) is a bar graph of the flexural strength of the composites prepared in examples 1 to 3 and comparative examples 1 to 2 and (b) is a bar graph of the compressive strength of the composites prepared in examples 1 to 3 and comparative examples 1 to 2, and the respective specific values are shown in table 1.
As can be seen from fig. 1 (a), after the carbon fiber and silica nano aerogel are added, the flexural strength of the composite material is reduced with the increase of the content of the aerogel, but still remains within the applicable range. FIG. 1 (b) shows that the compressive strength of the composite decreased with increasing aerogel content at the same fiber loading.
2) The microstructures of the composites prepared in examples 1 to 3 and comparative examples 1 to 2 were characterized, and the results are shown in fig. 2, in which (a) to (e) in fig. 2 correspond to the microstructure diagrams of the tensile section of the composites of example 1, example 2, example 3, comparative example 1 and comparative example 2, respectively.
As shown in FIG. 2, the polyphenylene sulfide matrix of comparative example 1 has a flat cross section, and after the carbon fiber is added to the polyphenylene sulfide matrix of comparative example 2, more fibers are pulled out of the polyphenylene sulfide matrix when the material is subjected to a tensile force. Compared with the comparative example 2, in the examples 1-3, after the aerogel is added, the fibers are partially broken in the matrix under the action of the stretching force, and are not completely separated from the matrix, so that the combination effect between the matrix and the fibers is not damaged by the addition of the aerogel, and the mechanical properties of the material are maintained to a certain degree.
3) The tribological properties and the thermal conductivity of the composites prepared in examples 1 to 3 and comparative examples 1 to 2 were characterized, and the results are shown in fig. 3, in which (a) is a histogram of the friction coefficient of the composites prepared in examples 1 to 3 and comparative examples 1 to 2 and (b) is a histogram of the thermal conductivity (room temperature versus 250 ℃) of the composites prepared in examples 1 to 3 and comparative examples 1 to 2.
As can be seen from fig. 3 (a), the friction coefficient of the pure polyphenylene sulfide matrix is about 0.394, and the friction coefficient of the composite material is reduced after the carbon fiber and aerogel are added for modification, wherein the friction coefficient of the composite material in example 2 is as low as 0.178, which is reduced by 55% compared with that of the pure matrix; as can be seen from fig. 3 (b), the thermal conductivity of the composite of comparative example 2 is about 0.42W/(m · K) at room temperature, and the thermal conductivity of the composite decreases after modification by adding aerogel, wherein example 1 decreases by 12% compared to comparative example 2; the thermal conductivity of the comparative example 2 is about 0.47W/(m.K) at 250 ℃, and after the aerogel is added for modification, the thermal conductivity of the composite material is reduced, and the thermal conductivity of the composite material is reduced to 0.36W/(m.K) in example 2 and is reduced by 23% compared with that of the comparative example 2.
4) The mechanical, tribological and thermal conductivity data of the composites prepared in examples 1 to 3 and comparative examples 1 to 2 are given in table 1:
TABLE 1 Performance data for composites prepared in examples 1-3 and comparative examples 1-2
The embodiment shows that the aerogel/polyphenylene sulfide self-lubricating friction material prepared by the invention has excellent tribological properties on the basis of maintaining mechanical strength and low heat conduction.
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 amendments can be made without departing from the principle of the present invention, and these modifications and amendments should also be considered as the protection scope of the present invention.
Claims (10)
1. The preparation method of the aerogel/polyphenylene sulfide self-lubricating friction material is characterized by comprising the following steps of:
mixing polyphenylene sulfide, aerogel, reinforcing fibers and a liquid-phase auxiliary agent to obtain a mixture;
and carrying out melt extrusion on the mixture to obtain the aerogel/polyphenylene sulfide self-lubricating friction material.
2. The method according to claim 1, wherein the polyphenylene sulfide has a melt density of 1.30 to 1.35g/cm 3 。
3. The preparation method according to claim 1, wherein the aerogel comprises one or more of silica aerogel, zirconium dioxide aerogel and carbon aerogel; the grain diameter of the aerogel is 10-50 nm, and the porosity is 90-99%.
4. The preparation method of claim 1, wherein the reinforcing fiber comprises one or more of carbon fiber, glass fiber and aluminum silicate fiber; the average diameter of the reinforced fiber is 2-10 μm, and the length-diameter ratio is 5-30.
5. The preparation method according to any one of claims 1 to 4, characterized in that the mass content of the polyphenylene sulfide is 74 to 80%, the mass content of the aerogel is 0.5 to 6%, and the mass content of the reinforcing fiber is 15 to 25%, based on the sum of the mass of the polyphenylene sulfide, the mass of the aerogel and the mass of the reinforcing fiber.
6. The preparation method according to claim 1, wherein the liquid phase adjuvant comprises one or more of methyl silicone oil, ethyl silicone oil and polyether modified silicone oil.
7. The method for preparing the composite material according to claim 1, wherein the polyphenylene sulfide, the aerogel, the reinforcing fiber and the liquid-phase adjuvant are mixed by:
firstly mixing the polyphenylene sulfide and the liquid-phase auxiliary agent to obtain a first mixture;
performing second mixing on the first mixture and the aerogel to obtain a second mixture;
and carrying out third mixing on the second mixture and the reinforced fibers to obtain the mixture.
8. The method of claim 1, wherein the melt extrusion is performed in a twin screw extruder, and the melt extrusion has an extrusion temperature of 280 to 320 ℃ and a screw rotation speed of 30 to 200rpm.
9. The method according to claim 1 or 8, wherein after the melt-extruding, the method further comprises sequentially granulating and injection-molding the obtained material; the injection molding conditions include: the temperature of the charging barrel is 300-330 ℃, the temperature of the mould is 140-160 ℃, the injection pressure is 30-80 MPa, and the pressure maintaining time is 5-10 s.
10. The aerogel/polyphenylene sulfide self-lubricating friction material prepared by the preparation method of any one of claims 1 to 9; the friction coefficient of the aerogel/polyphenylene sulfide self-lubricating friction material is 0.15-0.25, and the thermal conductivity at 250 ℃ is 0.36-0.39W/(m.K).
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