CN113667248A - Polymer filling modified material and forming process thereof - Google Patents
Polymer filling modified material and forming process thereof Download PDFInfo
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- CN113667248A CN113667248A CN202110985096.1A CN202110985096A CN113667248A CN 113667248 A CN113667248 A CN 113667248A CN 202110985096 A CN202110985096 A CN 202110985096A CN 113667248 A CN113667248 A CN 113667248A
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- polytetrafluoroethylene
- polyimide
- modified material
- mixing
- polyphenyl ester
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
Abstract
The invention discloses a high polymer filling modified material, which belongs to the technical field of high polymer materials, and comprises the following raw materials in percentage by weight: 50-75% of polytetrafluoroethylene, 10-25% of polyimide, 5-20% of polyphenyl ester, the polytetrafluoroethylene is suspended polytetrafluoroethylene resin, the particle size of the polytetrafluoroethylene fine resin is 15-50 μm, and the number average molecular weight of the polytetrafluoroethylene is 800-1200 ten thousand; the granularity of the polyimide is 300-500 meshes; the granularity of the polyphenyl ester is 300-500 meshes. The invention also discloses a molding process of the polymer filling modified material, which comprises the following molding steps: weighing polytetrafluoroethylene, polyimide and polyphenyl ester according to a weight ratio, and adding into a high-speed mixer for fully mixing; putting the mixed raw materials into a mould, and pressing and forming; placing the molded raw materials into a sintering furnace for sintering; and machining the sintered semi-finished product to obtain a finished sealing element product.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a high polymer filling modified material and a forming process thereof.
Background
The polymer material is a general name of a material based on a polymer compound, and is a material composed of a compound with relatively high molecular weight, and the modification of the material can improve the original performance of the polymer material through the action of a physical, mechanical or chemical mode.
The polymer modified material can replace metal to be used as a structural material and has excellent comprehensive properties of high mechanical strength, high and low temperature resistance, corrosion resistance, high compressive strength and the like.
Polytetrafluoroethylene is an artificially synthesized polymer material using fluorine to replace all hydrogen atoms in polyethylene. The polytetrafluoroethylene has good performance and is a key material applied to dynamic sealing at present, but the polytetrafluoroethylene is easy to flow in a cold state, has poor creep resistance and rebound resilience in the using process, so that the sealing reliability and the service life of the polytetrafluoroethylene sealing material are difficult to meet the requirements of practical application. Therefore, in the actual use process, the polytetrafluoroethylene can be compounded with other materials, the comprehensive characteristics of the composite material are utilized on the basis of keeping the excellent characteristics of the polytetrafluoroethylene, the defects of the composite material are made up, the strength, rigidity, dimensional stability, rebound resilience and wear resistance of the material are improved, and the application requirements are met.
Disclosure of Invention
The invention mainly aims to provide a high-molecular filling modified material and a forming process thereof, and aims to solve the technical problems of poor creep resistance, wear resistance and rebound resilience of the existing polytetrafluoroethylene.
In order to achieve the purpose, the invention provides a polymer filling modified material, which comprises the following raw materials in percentage by weight:
50-75 percent of polytetrafluoroethylene
10 to 25 percent of polyimide
5-20% of polyphenyl ester
Wherein the polytetrafluoroethylene is suspended polytetrafluoroethylene resin, the particle size of the polytetrafluoroethylene fine resin is 15-50 μm, and the number average molecular weight of the polytetrafluoroethylene is 800-1200 ten thousand; the granularity of the polyimide is 300-500 meshes; the granularity of the polyphenyl ester is 300-500 meshes.
Preferably, the polyimide and the polyphenyl ester are filling materials.
Preferably, the modified material has the best performance when the weight percentage of the polytetrafluoroethylene is 70%, the weight percentage of the polyimide is 20% and the weight percentage of the polyphenyl ester is 10%.
The forming process of the polymer filling modified material comprises the following forming steps:
the method comprises the following steps: weighing polytetrafluoroethylene, polyimide and polyphenyl ester according to a weight ratio, and then sequentially adding the materials into a high-speed mixer for fully mixing;
step two: putting the mixed raw materials into a mould, and pressing and forming;
step three: placing the molded raw materials into a sintering furnace for sintering;
step four: and machining the sintered semi-finished product to obtain a finished sealing element product.
Preferably, in the step one, the mixing speed of the high-speed mixer is 1000-1800r/min, the mixing temperature is 22-32 ℃, the mixing times are 3-5 times, and the mixing time is 10-20min each time.
Preferably, in the second step, the pressing force for pressing and forming is 20-60MPa, and the pressing time is 5-15 min.
Preferably, in the third step, the sintering temperature is 320-380 ℃, the heating rate is 5 ℃/min, the heating time is 60-120min, the temperature is kept after heating, the heat preservation time is 2-3h, and then the mixture is cooled to the normal temperature.
Preferably, in step four, the semi-finished product is subjected to high and low temperature treatment with hydraulic oil before mechanical processing.
The technical scheme of the invention has the beneficial effects that:
the invention relates to a high polymer filling modified material, which adopts polyimide and polyphenyl ester as filling materials to change the performance of poly tetrachloroethylene; the polytetrafluoroethylene has the characteristics of high crystallinity, large relative molecular mass and no molecular branch, and the molecular attractive force of the polytetrafluoroethylene is small, so that slippage is easily generated among molecules after the polytetrafluoroethylene is subjected to shear stress, and the wear resistance of the polytetrafluoroethylene is poor.
Detailed Description
In the following, the embodiments of the present invention will be described in detail in a complete and clear manner, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a polymer filling modified material, which comprises the following raw materials in percentage by weight:
50-75 percent of polytetrafluoroethylene
10 to 25 percent of polyimide
5-20% of polyphenyl ester
Wherein, the polytetrafluoroethylene is suspended polytetrafluoroethylene resin, the particle size of the polytetrafluoroethylene fine resin is 15-50 μm, and the number average molecular weight of the polytetrafluoroethylene is 800-1200 ten thousand; the granularity of the polyimide is 300-500 meshes; the granularity of the polyphenyl ester is 300-500 meshes.
The invention adopts polyimide and polyphenyl ester as filling materials to change the performance of the poly tetrachloroethylene. The polytetrafluoroethylene has the characteristics of high crystallinity, large relative molecular mass and no molecular branch, and the molecular attractive force of the polytetrafluoroethylene is small, so that slippage is easily generated among molecules after the polytetrafluoroethylene is subjected to shear stress, and the wear resistance of the polytetrafluoroethylene is poor.
The invention uses two inorganic materials of polyimide and polyphenyl ester as the filling material of the polytetrafluoroethylene, has the characteristics of low cost and wide applicability, realizes the further improvement of the performance of the polytetrafluoroethylene, and does not have the problems of uneven mixing and agglomeration in the mixing process.
In a preferred embodiment, the modified material has the best performance when the weight percentage of polytetrafluoroethylene is 70%, the weight percentage of polyimide is 20%, and the weight percentage of polyphenyl ester is 10%. The best performance mainly means that when the weight percentage of the polytetrafluoroethylene is 70%, the weight percentage of the polyimide is 20% and the weight percentage of the polyphenyl ester is 10%, the hardness and the abrasion resistance of the finished sealing material made of the modified polytetrafluoroethylene reach the best state.
Example 1
The forming process of the polymer filling modified material comprises the following forming steps:
the method comprises the following steps: weighing polytetrafluoroethylene, polyimide and polyphenyl ester according to a weight ratio, and then sequentially adding the materials into a high-speed mixer for fully mixing;
step two: putting the mixed raw materials into a mould, and pressing and forming;
step three: placing the molded raw materials into a sintering furnace for sintering;
step four: and machining the sintered semi-finished product to obtain a finished sealing element product.
In the first step, the mixing speed of the high-speed mixer is 1000-1800r/min, the mixing temperature is 22-32 ℃, the mixing times are 3-5 times, and the mixing time is 10-20min each time. The high-speed mixer is used for uniformly mixing polytetrafluoroethylene, polyimide and polyphenyl ester raw materials, the temperature is usually between 25 and 28 ℃ during mixing, the mixing frequency is preferably 5 times, the mixing frequency is more, the mixing is more sufficient, the phenomena of uneven mixing and material agglomeration cannot occur, the normal operation of subsequent processing is ensured, and the related performance of the polytetrafluoroethylene cannot be influenced.
In the second step, the pressing force for pressing and forming is 20-60MPa, and the pressing time is 5-15 min. The pressing molding is to utilize pressure to compact the powder in the mold to a compact structure to form a blank with a certain shape and size, and has the advantages of simple pressing molding process, wide range of sizes of pressed products and easy operation.
In the third step, the sintering temperature is 320-380 ℃, the heating rate is 5 ℃/min, the heating time is 60-120min, the temperature is kept after heating, the heat preservation time is 2-3h, and then the temperature is cooled to the normal temperature. The sintering is to sinter the semi-finished product after the pressing forming to form a compact body, and after the semi-finished product is sintered, the grain size, the pore size and the shape and distribution of the grain boundary can be changed, so that the purpose of influencing the performance of the semi-finished product is achieved.
In the fourth step, before mechanical processing, the semi-finished product needs to be subjected to high-low temperature treatment by hydraulic oil. The finished product treated by the hydraulic oil has strong abrasion resistance.
Example 2
The forming process of the polymer filling modified material comprises the following forming steps:
the method comprises the following steps: weighing polytetrafluoroethylene, polyimide and polyphenyl ester according to a weight ratio, and then sequentially adding the materials into a high-speed mixer for fully mixing;
step two: putting the mixed raw materials into a mould, and pressing and forming;
step three: placing the molded raw materials into a sintering furnace for sintering;
step four: and machining the sintered semi-finished product to obtain a finished sealing element product.
In the first step, the mixing speed of the high-speed mixer is 1000r/min, the mixing temperature is 22 ℃, the mixing times are 3 times, and the mixing time is 10min each time.
In the second step, the pressing force for pressing and forming is 20MPa, and the pressing time is 5 min.
In the third step, the sintering temperature is 320 ℃, the heating rate is 5 ℃/min, the heating time is 60min, the temperature is kept for 2h after heating, and then the temperature is cooled to the normal temperature.
In the fourth step, before mechanical processing, the semi-finished product needs to be subjected to high-low temperature treatment by hydraulic oil.
Example 3
The forming process of the polymer filling modified material comprises the following forming steps:
the method comprises the following steps: weighing polytetrafluoroethylene, polyimide and polyphenyl ester according to a weight ratio, and then sequentially adding the materials into a high-speed mixer for fully mixing;
step two: putting the mixed raw materials into a mould, and pressing and forming;
step three: placing the molded raw materials into a sintering furnace for sintering;
step four: and machining the sintered semi-finished product to obtain a finished sealing element product.
In the first step, the mixing speed of the high-speed mixer is 1800r/min, the mixing temperature is 32 ℃, the mixing times are 5 times, and the mixing time is 20min each time.
In the second step, the pressing force for pressing and forming is 60MPa, and the pressing time is 15 min.
In the third step, the sintering temperature is 380 ℃, the heating rate is 5 ℃/min, the heating time is 120min, the temperature is kept after heating, the heat preservation time is 3h, and then the temperature is cooled to the normal temperature.
In the fourth step, before mechanical processing, the semi-finished product needs to be subjected to high-low temperature treatment by hydraulic oil.
Example 4
The forming process of the polymer filling modified material comprises the following forming steps:
the method comprises the following steps: weighing polytetrafluoroethylene, polyimide and polyphenyl ester according to a weight ratio, and then sequentially adding the materials into a high-speed mixer for fully mixing;
step two: putting the mixed raw materials into a mould, and pressing and forming;
step three: placing the molded raw materials into a sintering furnace for sintering;
step four: and machining the sintered semi-finished product to obtain a finished sealing element product.
In the first step, the mixing speed of the high-speed mixer is 1500r/min, the mixing temperature is 26 ℃, the mixing times are 4 times, and the mixing time is 15min each time.
In the second step, the pressing force for pressing and forming is 40MPa, and the pressing time is 10 min.
In the third step, the sintering temperature is 350 ℃, the heating rate is 5 ℃/min, the heating time is 90min, the temperature is kept for 2.5h after heating, and then the mixture is cooled to the normal temperature.
In the fourth step, before mechanical processing, the semi-finished product needs to be subjected to high-low temperature treatment by hydraulic oil.
The hardness of the composite material is further illustrated below with reference to specific embodiments:
as the addition amount of the polyphenyl ester and the polyimide is increased, the hardness of the composite material is increased.
The polyphenyl ester belongs to rigid filler, and the hardness of the polyphenyl ester is higher than that of polytetrafluoroethylene, so that after the polyphenyl ester is filled with the polytetrafluoroethylene, the rigidity of the composite material is increased, the toughness is reduced, the deformation resistance is increased, the plastic deformation of the composite material is reduced, the hardness is increased, and the tensile property of the material is reduced.
After the polytetrafluoroethylene is filled in the polyimide, the crystallinity of the composite material is reduced, the melting point is increased, the tensile strength and the elongation at break of the composite material are gradually reduced along with the increase of the content of the polyimide, but the creep resistance is obviously improved, the polyimide effectively bears friction load during friction experiment, when the filling mass fraction of the polyimide is 20%, the volume wear rate of the composite material can be reduced by 5 orders of magnitude, and the good low-friction characteristic of the polytetrafluoroethylene is maintained while the wear resistance of the polytetrafluoroethylene is effectively improved.
In conclusion, the polymer filling modified material of the invention uses two filling materials of polyimide and polyphenyl ester, so that the tensile strength and the elongation at break of the composite material are obviously reduced, and the creep resistance and the wear resistance of the composite material can be further improved.
The above description is only a part of the preferred embodiment of the present invention, and the text should not be construed as limiting the scope of the present invention, and all the equivalent structural changes made by the content of the present specification or the related technical fields directly/indirectly using the content of the present specification are included in the scope of the present invention.
Claims (8)
1. The polymer filling modified material is characterized in that: the modified material comprises the following raw materials in percentage by weight:
50-75 percent of polytetrafluoroethylene
10 to 25 percent of polyimide
5-20% of polyphenyl ester
Wherein the polytetrafluoroethylene is suspended polytetrafluoroethylene resin, the particle size of the polytetrafluoroethylene fine resin is 15-50 μm, and the number average molecular weight of the polytetrafluoroethylene is 800-1200 ten thousand; the granularity of the polyimide is 300-500 meshes; the granularity of the polyphenyl ester is 300-500 meshes.
2. The polymer-filled and modified material according to claim 1, wherein: the polyimide and the polyphenyl ester are filling materials.
3. The polymer-filled and modified material according to claim 1, wherein: when the weight percentage of the polytetrafluoroethylene is 70%, the weight percentage of the polyimide is 20% and the weight percentage of the polyphenyl ester is 10%, the performance of the modified material is the best.
4. The forming process of the polymer filling modified material is characterized by comprising the following forming steps:
the method comprises the following steps: weighing polytetrafluoroethylene, polyimide and polyphenyl ester according to a weight ratio, and then sequentially adding the materials into a high-speed mixer for fully mixing;
step two: putting the mixed raw materials into a mould, and pressing and forming;
step three: placing the molded raw materials into a sintering furnace for sintering;
step four: and machining the sintered semi-finished product to obtain a finished sealing element product.
5. The process of claim 4, wherein in the step one, the mixing speed of the high-speed mixer is 1800 rpm, the mixing temperature is 22-32 ℃, the mixing frequency is 3-5 times, and the mixing time is 10-20 min.
6. The process of claim 4, wherein in the step two, the pressing force for pressing is 20-60MPa, and the pressing time is 5-15 min.
7. The molding process of polymer filling modification material according to claim 4, wherein in step three, the sintering temperature is 320-.
8. The process of claim 4, wherein in step four, the semi-finished product is subjected to high and low temperature treatment with hydraulic oil before mechanical processing.
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Citations (5)
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| CN1419580A (en) * | 2000-03-24 | 2003-05-21 | 大金工业株式会社 | Seal ring |
| CN101696311A (en) * | 2009-10-22 | 2010-04-21 | 洛阳轴研科技股份有限公司 | Bearing retainer material and preparation method thereof |
| CN111808422A (en) * | 2020-06-09 | 2020-10-23 | 洛阳轴承研究所有限公司 | Polyimide composite material for bearing retainer, preparation method of polyimide composite material and bearing retainer |
| CN112745607A (en) * | 2020-07-30 | 2021-05-04 | 台州恩普密封件有限公司 | Sealing material taking PTFE as organism in ultra-high-speed environment and preparation method thereof |
| CN113248852A (en) * | 2021-07-15 | 2021-08-13 | 北京石墨烯技术研究院有限公司 | Modified polytetrafluoroethylene composite material, preparation method thereof and sealing element |
-
2021
- 2021-08-25 CN CN202110985096.1A patent/CN113667248A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1419580A (en) * | 2000-03-24 | 2003-05-21 | 大金工业株式会社 | Seal ring |
| CN101696311A (en) * | 2009-10-22 | 2010-04-21 | 洛阳轴研科技股份有限公司 | Bearing retainer material and preparation method thereof |
| CN111808422A (en) * | 2020-06-09 | 2020-10-23 | 洛阳轴承研究所有限公司 | Polyimide composite material for bearing retainer, preparation method of polyimide composite material and bearing retainer |
| CN112745607A (en) * | 2020-07-30 | 2021-05-04 | 台州恩普密封件有限公司 | Sealing material taking PTFE as organism in ultra-high-speed environment and preparation method thereof |
| CN113248852A (en) * | 2021-07-15 | 2021-08-13 | 北京石墨烯技术研究院有限公司 | Modified polytetrafluoroethylene composite material, preparation method thereof and sealing element |
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Application publication date: 20211119 |