CN116925485A - Production process of PTFE (polytetrafluoroethylene) composite sealing material with transition layer for pneumatic air compression system and pneumatic air compression sealing device - Google Patents
Production process of PTFE (polytetrafluoroethylene) composite sealing material with transition layer for pneumatic air compression system and pneumatic air compression sealing device Download PDFInfo
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- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 216
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 216
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 107
- 239000003566 sealing material Substances 0.000 title claims abstract description 80
- 239000002131 composite material Substances 0.000 title claims abstract description 78
- 238000007906 compression Methods 0.000 title claims abstract description 44
- 230000006835 compression Effects 0.000 title claims abstract description 43
- 230000007704 transition Effects 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000007789 sealing Methods 0.000 title claims abstract description 16
- 239000006185 dispersion Substances 0.000 claims abstract description 96
- 239000011347 resin Substances 0.000 claims abstract description 95
- 229920005989 resin Polymers 0.000 claims abstract description 95
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 92
- 239000004917 carbon fiber Substances 0.000 claims abstract description 92
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 69
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 69
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000000463 material Substances 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 114
- 238000001746 injection moulding Methods 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 13
- 238000009210 therapy by ultrasound Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 239000012778 molding material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 8
- 230000008021 deposition Effects 0.000 description 8
- 239000002071 nanotube Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 239000010432 diamond Substances 0.000 description 4
- 229910003460 diamond Inorganic materials 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3009—Sulfides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
The application relates to the technical field of pneumatic air compression equipment, in particular to a production process of a PTFE (polytetrafluoroethylene) composite sealing material of a pneumatic air compression system with a transition layer and a pneumatic air compression sealing device, wherein the PTFE composite sealing material comprises the following raw materials: 70% -85% of polytetrafluoroethylene dispersion resin, 2% -7% of carbon fiber, 8% -13% of carbon nano tube and MoS 2 5% -10%; the production method can prepare PTFE composite density with material distribution having transition layerThe sealing material enables the high rebound resilience and the low creep property of the PTFE composite sealing material to coexist, and improves the applicability of the PTFE sealing material in a new energy air compressor.
Description
Technical Field
The application relates to the technical field of pneumatic air compression equipment, in particular to a production process of a PTFE (polytetrafluoroethylene) composite sealing material of a pneumatic air compression system with a transition layer and a pneumatic air compression sealing device.
Background
Along with the popularization of new energy vehicles, the oil-free piston type new energy air compressor is also popularized in a large range. The new energy air compressor drives the piston to move through the gas pressure, and the sealing material used as the piston is required to have very good sealing performance due to the low gas pressure of the new energy air compressor, and meanwhile, the sealing material is required to have good rebound resilience and low creep. Polytetrafluoroethylene (PTFE) has good chemical stability, a low coefficient of friction, high temperature resistance, good thermal stability and low creep, and has been widely used in industry. However, PTFE has poor resiliency and therefore limits the use of PTFE pneumatic air compression in sealing materials. At present, PTFE is taken as a matrix, PTFE is modified by using high wear-resistant filler, and for example, fibers, diamond, nano tubes and the like are compounded with the PTFE, so that the wear resistance and the elasticity of the PTFE are improved. The current PTFE composite material is a material which is integrally homogeneous, so that some properties of the PTFE composite material cannot coexist, such as rebound resilience and creep property are mutually balanced, so that the current modified PTFE cannot be well applied to the sealing material of the new energy air compressor.
Disclosure of Invention
The application aims to provide a production process of a PTFE composite sealing material with a transition layer for a pneumatic air compression system, which can be used for preparing the PTFE composite sealing material with the transition layer in material distribution, so that the high rebound resilience and the low creep property of the PTFE composite sealing material coexist, and the applicability of the PTFE sealing material in a new energy air compressor is improved.
In order to achieve one of the above objects, the present application provides the following technical solutions:
the production process of the PTFE composite sealing material of the pneumatic air compression system with the transition layer comprises the following raw materials:
70% -85% of polytetrafluoroethylene dispersion resin
2% -7% of carbon fiber
Carbon nano tube 8% -13%
MoS 2 5%~10%；
Wherein, the production process of the PTFE composite sealing material comprises the following steps:
s1, dividing the polytetrafluoroethylene dispersion resin into a first polytetrafluoroethylene dispersion resin, a second polytetrafluoroethylene dispersion resin and a third polytetrafluoroethylene dispersion resin; dividing the carbon fibers into first carbon fibers, second carbon fibers and third carbon fibers; dividing the carbon nanotubes into a first carbon nanotube and a second carbon nanotube; moS is carried out 2 Divided into a first MoS 2 Second MoS 2 And a third MoS 2 ；
S2, dispersing the first polytetrafluoroethylene dispersion resin, the first carbon fiber, the first carbon nano tube and the first MoS 2 Uniformly mixing at normal temperature to obtain a first mixture; dispersing the second polytetrafluoroethylene dispersion resin, second carbon fibers, second carbon nanotubes and second MoS 2 Uniformly mixing at normal temperature to obtain a second mixture; dispersing the third polytetrafluoroethylene dispersion resin, third carbon fiber and third MoS 2 Uniformly mixing at normal temperature to obtain a third mixture;
s3, respectively reacting the first mixture, the second mixture and the third mixture at 200-250 ℃ for 30-40 min, and preserving heat for later use to obtain a molding material;
s4, injecting the first mixture into a forming die, then injecting the third mixture into the forming die, and finally injecting the second mixture into the forming die for compression forming; wherein, the material filling opening of the forming die is positioned above the forming cavity of the injection die.
In some embodiments, in S2, ultrasonic vibration is applied to mix the first mixture, the second mixture, and the third mixture respectively to obtain the first mixture, the second mixture, and the third mixture, where the ultrasonic treatment time is 50min to 60 min.
In some embodiments, the weight ratio of the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin, and the third polytetrafluoroethylene dispersion resin is 1:1: (0.5 to 0.8).
In some embodiments, the weights of the first, second, and third carbon fibers are assigned according to a preset resilience, the higher the preset resilience, the greater the assigned carbon fiber weight.
In some embodiments, the weight ratio of the first carbon fiber, the second carbon fiber, and the third carbon fiber is 1:1: (0.2 to 0.5).
In some embodiments, the weight ratio of the first carbon nanotubes to the second carbon nanotubes is 1:1.
in some embodiments, the first MoS 2 The second MoS 2 And the third MoS 2 The weight ratio of (2) is 1:1: (0.5 to 0.8).
In some embodiments, in the step S4, the injection molding temperature is 380-400 ℃ and the molding time is 2-3 hours.
In some embodiments, in S4, the molding mold is maintained in the injection molding process, where the maintaining pressure is 40mpa to 60mpa and the maintaining time is 3.5h to 4h.
The production process of the PTFE composite sealing material with the transition layer for the pneumatic air compression system has the beneficial effects that:
(1) According to the production process of the PTFE composite sealing material with the transition layer for the pneumatic air compression system, which is disclosed by the application, by utilizing the characteristic that carbon nano tubes can be wound and grown along the edges of carbon fibers, the carbon fiber content in the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin and the third polytetrafluoroethylene dispersion resin is controlled, so that the deposition amount of the carbon nano tubes in the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin and the third polytetrafluoroethylene dispersion resin is controlled, the transition layer is structurally generated by the PTFE composite sealing material with the laminated first mixture, second mixture and third mixture, namely, the deposition amount of the carbon nano tubes of the third mixture at the middle position is relatively small, the performance of PTFE at the middle position can be furthest reserved, the chemical stability, high temperature resistance and high strength of the third mixture at the middle position are good, the overall low creep performance of the PTFE composite sealing material is ensured, and as the first mixture and the second mixture at two sides are rich in carbon nano tubes, the rebound resilience of the material is increased, and the rebound resilience of the first mixture and the second mixture are positioned at the outer sides of the inner walls of the PTFE composite sealing material and the PTFE composite sealing material can better contact with the inner walls of a sealing device, and the rebound resilience of the sealing material can be better, and the rebound resilience of the sealing material can be adapted to the reciprocating motion.
(2) According to the production process of the PTFE composite sealing material with the transition layer for the pneumatic air compression system, the carbon fiber content in the first mixture, the second mixture and the third mixture is controlled, the nano tubes in the first mixture, the second mixture and the third mixture are controlled, and then the rebound resilience and creep distribution of the PTFE composite sealing material are controlled, so that the rebound resilience and creep of the PTFE composite sealing material are balanced with each other.
(3) According to the production process of the PTFE composite sealing material with the transition layer in the pneumatic air compression system, the die is adopted for compression molding, and the injection port is positioned above the molding cavity of the injection die, so that the transition layer is formed conveniently.
In order to achieve the second purpose, the application provides the following technical scheme:
the pneumatic air pressure sealing device is manufactured by adopting the production process of the PTFE composite sealing material with the transition layer for the pneumatic air pressure system.
Detailed Description
The preferred embodiments of the present application will be described in more detail below, however, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Example 1
Along with the popularization of new energy vehicles, the oil-free piston type new energy air compressor is also popularized in a large range. The new energy air compressor drives the piston to move through the gas pressure, and the sealing material used as the piston is required to have very good sealing performance due to the low gas pressure of the new energy air compressor, and meanwhile, the sealing material is required to have good rebound resilience and low creep. Polytetrafluoroethylene (PTFE) has good chemical stability, a low coefficient of friction, high temperature resistance, and good thermal stability, and has been widely used in industry. However, PTFE has poor resiliency and creep properties, thus limiting the use of PTFE pneumatic air compression in sealing materials. At present, PTFE is taken as a matrix, PTFE is modified by using high wear-resistant filler, and for example, fibers, diamond, nano tubes and the like are compounded with the PTFE, so that the wear resistance and the elasticity of the PTFE are improved. The current PTFE composite material is a material which is integrally homogeneous, so that some properties of the PTFE composite material cannot coexist, such as rebound resilience and creep property are mutually balanced, so that the current modified PTFE cannot be well applied to the sealing material of the new energy air compressor.
The embodiment discloses a production process of a PTFE composite sealing material with a transition layer for a pneumatic air compression system, wherein the PTFE composite sealing material comprises the following raw materials: 85% of polytetrafluoroethylene dispersion resin, 2% of carbon fiber, 8% of carbon nano tube and MoS 2 10%；
Wherein, the production process of the PTFE composite sealing material comprises the following steps:
s1, dividing the polytetrafluoroethylene dispersion resin into a first polytetrafluoroethylene dispersion resin, a second polytetrafluoroethylene dispersion resin and a third polytetrafluoroethylene dispersion resin; dividing the carbon fibers into first carbon fibers, second carbon fibers and third carbon fibers; dividing the carbon nanotubes into a first carbon nanotube and a second carbon nanotube; moS is carried out 2 Divided into a first MoS 2 Second MoS 2 And a third MoS 2 ；
S2, dispersing the first polytetrafluoroethylene dispersion resin, the first carbon fiber, the first carbon nano tube and the first MoS 2 Uniformly mixing at normal temperature to obtain a first mixture; dispersing the second polytetrafluoroethylene dispersion resin, second carbon fibers, second carbon nanotubes and second MoS 2 Uniformly mixing at normal temperature to obtain a second mixture; dispersing the third polytetrafluoroethylene dispersion resin, third carbon fiber and third MoS 2 Uniformly mixing at normal temperature to obtain a third mixture;
s3, respectively reacting the first mixture, the second mixture and the third mixture at 200 ℃ for 30min, and preserving heat for later use to obtain a molding material;
s4, injecting the first mixture into a forming die, then injecting the third mixture into the forming die, and finally injecting the second mixture into the forming die for compression forming; wherein, the material filling opening of the forming die is positioned above the forming cavity of the injection die.
In the injection molding process, after all the mixture is added, heating and pressurizing to mold, wherein the molding temperature is 175 ℃, and the pressure maintaining time is 2min; the pressurizing pressure is 35Mpa, and the person skilled in the art can adjust and operate according to the experimental operation capability, which is not described in detail.
According to the production process of the PTFE composite sealing material with the transition layer for the pneumatic air compression system, the characteristic that carbon nano tubes can be wound and grown along the edges of carbon fibers is utilized, the carbon fiber content in the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin and the third polytetrafluoroethylene dispersion resin is controlled, so that the deposition amount of the carbon nano tubes in the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin and the third polytetrafluoroethylene dispersion resin is controlled, the transition layer is structurally generated by the PTFE composite sealing material with the laminated first mixture, second mixture and third mixture, namely, the deposition amount of the carbon nano tubes of the third mixture at the middle position is relatively small, the performance of PTFE at the middle position can be furthest reserved, the chemical stability, high temperature resistance and high strength of the third mixture at the middle position are good, the overall low creep property of the PTFE composite sealing material is guaranteed, and the rebound resilience of the material is improved due to the fact that the first mixture and the second mixture at two sides are rich in carbon nano tubes, the rebound resilience of the material is improved, and the rebound resilience of the first mixture and the second mixture are positioned at the outer side of the PTFE composite sealing material is more suitable for the reciprocating motion of a sealing device; and by controlling the carbon fiber content in the first, second and third mixtures, the nanotubes in the first, second and third mixtures are controlled, which in turn controls the distribution of resilience and creep of the PTFE composite seal material such that the resilience and creep of the PTFE composite seal material balance each other.
In this embodiment, in S2, ultrasonic vibration is applied to mix the first mixture, the second mixture, and the third mixture, respectively, and the ultrasonic treatment time is 50min. The ultrasonic treatment improves the mixing and homogenizing effects.
In this embodiment, the weight ratio of the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin, and the third polytetrafluoroethylene dispersion resin is 1:1:0.5. the polytetrafluoroethylene dispersion resin is distributed, so that the quantity of the middle polytetrafluoroethylene dispersion resin is small, and the rebound resilience ratio is relatively improved. In practical application, the adjustment can be carried out according to practical needs.
In this embodiment, the weights of the first carbon fiber, the second carbon fiber and the third carbon fiber are distributed according to the preset rebound resilience, and the higher the preset rebound resilience, the larger the distributed carbon fiber weight. Since the more carbon fibers, the more carbon nanotubes are produced by winding, the more carbon nanotubes, the better the rebound resilience.
In this embodiment, the weight ratio of the first carbon fiber, the second carbon fiber and the third carbon fiber is 1:1:0.2. such carbon fiber distribution is also to control the content of carbon nano-meter. In practical application, the adjustment can be carried out according to practical needs.
In this embodiment, the weight ratio of the first carbon nanotube to the second carbon nanotube is 1:1. so that the carbon nanotube content of the first polytetrafluoroethylene dispersion resin and the second polytetrafluoroethylene dispersion resin are as equal as possible.
In this embodiment, the first MoS 2 The second MoS 2 And the third MoS 2 The weight ratio of (2) is 1:1:0.5. the MoS 2 Has lubricating effect and is prepared according to polytetrafluoroethylene dispersion resin.
In this embodiment, in S4, the injection molding temperature is 380 ℃ and the molding time is 2h.
In this embodiment, in S4, the molding mold is maintained in the injection molding process, where the maintaining pressure is 40MPa and the maintaining time is 3.5h. The pressure maintaining strength is increased, so that the carbon nano tube is dispersed more comprehensively, and the strength of the composite material is better.
Example 2
Along with the popularization of new energy vehicles, the oil-free piston type new energy air compressor is also popularized in a large range. The new energy air compressor drives the piston to move through the gas pressure, and the sealing material used as the piston is required to have very good sealing performance due to the low gas pressure of the new energy air compressor, and meanwhile, the sealing material is required to have good rebound resilience and low creep. Polytetrafluoroethylene (PTFE) has good chemical stability, a low coefficient of friction, high temperature resistance, and good thermal stability, and has been widely used in industry. However, PTFE has poor resiliency and creep properties, thus limiting the use of PTFE pneumatic air compression in sealing materials. At present, PTFE is taken as a matrix, PTFE is modified by using high wear-resistant filler, and for example, fibers, diamond, nano tubes and the like are compounded with the PTFE, so that the wear resistance and the elasticity of the PTFE are improved. The current PTFE composite material is a material which is integrally homogeneous, so that some properties of the PTFE composite material cannot coexist, such as rebound resilience and creep property are mutually balanced, so that the current modified PTFE cannot be well applied to the sealing material of the new energy air compressor.
The embodiment discloses a production process of a PTFE composite sealing material with a transition layer for a pneumatic air compression system, wherein the PTFE composite sealing material comprises the following raw materials: 70% of polytetrafluoroethylene dispersion resin, 2% of carbon fiber, 8% of carbon nano tube and MoS 2 5%；
Wherein, the production process of the PTFE composite sealing material comprises the following steps:
s1, dividing the polytetrafluoroethylene dispersion resin into a first polytetrafluoroethylene dispersion resin, a second polytetrafluoroethylene dispersion resin and a third polytetrafluoroethylene dispersion resin; dividing the carbon fibers into first carbon fibers, second carbon fibers and third carbon fibers; dividing the carbon nanotubes into a first carbon nanotube and a second carbon nanotube; moS is carried out 2 Divided into a first MoS 2 Second MoS 2 And a third MoS 2 ；
S 2 Dispersing the first polytetrafluoroethylene dispersion resin, first carbon fibers, first carbon nanotubes and first MoS 2 Uniformly mixing at normal temperature to obtain a first mixture; dispersing the second polytetrafluoroethylene dispersion resin, second carbon fibers, second carbon nanotubes and second MoS 2 Uniformly mixing at normal temperature to obtain a second mixture; dispersing the third polytetrafluoroethylene dispersion resin, third carbon fiber and third MoS 2 Uniformly mixing at normal temperature to obtain a third mixture;
s3, respectively reacting the first mixture, the second mixture and the third mixture at 250 ℃ for 40min, and preserving heat for later use to obtain a molding material;
s4, injecting the first mixture into a forming die, then injecting the third mixture into the forming die, and finally injecting the second mixture into the forming die for compression forming; wherein, the material filling opening of the forming die is positioned above the forming cavity of the injection die.
In the injection molding process, after all the mixture is added, heating and pressurizing to mold, wherein the molding temperature is 190 ℃, and the pressure maintaining time is 3min; the pressurizing pressure is 30Mpa, and the person skilled in the art can adjust and operate according to the experimental operation capability, which is not described in detail.
According to the production process of the PTFE composite sealing material with the transition layer for the pneumatic air compression system, the characteristic that carbon nano tubes can be wound and grown along the edges of carbon fibers is utilized, the carbon fiber content in the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin and the third polytetrafluoroethylene dispersion resin is controlled, so that the deposition amount of the carbon nano tubes in the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin and the third polytetrafluoroethylene dispersion resin is controlled, the transition layer is structurally generated by the PTFE composite sealing material with the laminated first mixture, second mixture and third mixture, namely, the deposition amount of the carbon nano tubes of the third mixture at the middle position is relatively small, the performance of PTFE at the middle position can be furthest reserved, the chemical stability, high temperature resistance and high strength of the third mixture at the middle position are good, the overall low creep property of the PTFE composite sealing material is guaranteed, and the rebound resilience of the material is improved due to the fact that the first mixture and the second mixture at two sides are rich in carbon nano tubes, the rebound resilience of the material is improved, and the rebound resilience of the first mixture and the second mixture are positioned at the outer side of the PTFE composite sealing material is more suitable for the reciprocating motion of a sealing device; and by controlling the carbon fiber content in the first, second and third mixtures, the nanotubes in the first, second and third mixtures are controlled, which in turn controls the distribution of resilience and creep of the PTFE composite seal material such that the resilience and creep of the PTFE composite seal material balance each other.
In this embodiment, in S2, ultrasonic vibration is applied to mix the first mixture, the second mixture, and the third mixture, respectively, and the ultrasonic treatment time is 60 min. The ultrasonic treatment improves the mixing and homogenizing effects.
In this embodiment, the weight ratio of the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin, and the third polytetrafluoroethylene dispersion resin is 1:1:0.8. the polytetrafluoroethylene dispersion resin is distributed, so that the quantity of the middle polytetrafluoroethylene dispersion resin is small, and the rebound resilience ratio is relatively improved. In practical application, the adjustment can be carried out according to practical needs.
In this embodiment, the weights of the first carbon fiber, the second carbon fiber and the third carbon fiber are distributed according to the preset rebound resilience, and the higher the preset rebound resilience, the larger the distributed carbon fiber weight. Since the more carbon fibers, the more carbon nanotubes are produced by winding, the more carbon nanotubes, the better the rebound resilience.
In this embodiment, the weight ratio of the first carbon fiber, the second carbon fiber and the third carbon fiber is 1:1:0.5. such carbon fiber distribution is also to control the content of carbon nano-meter. In practical application, the adjustment can be carried out according to practical needs.
In this embodiment, the weight ratio of the first carbon nanotube to the second carbon nanotube is 1:1. so that the carbon nanotube content of the first polytetrafluoroethylene dispersion resin and the second polytetrafluoroethylene dispersion resin are as equal as possible.
In this embodiment, the first MoS 2 The second MoS 2 And the third MoS 2 The weight ratio of (2) is 1:1:0.8. the MoS 2 Has lubricating effect and is prepared according to polytetrafluoroethylene dispersion resin.
In this embodiment, in S4, the injection molding temperature is 380 ℃ and the molding time is 2h.
In this embodiment, in S4, the molding mold is maintained in the injection molding process, where the maintaining pressure is 40MPa and the maintaining time is 3.5h. The pressure maintaining strength is increased, so that the carbon nano tube is dispersed more comprehensively, and the strength of the composite material is better.
Example 3
Along with the popularization of new energy vehicles, the oil-free piston type new energy air compressor is also popularized in a large range. The new energy air compressor drives the piston to move through the gas pressure, and the sealing material used as the piston is required to have very good sealing performance due to the low gas pressure of the new energy air compressor, and meanwhile, the sealing material is required to have good rebound resilience and low creep. Polytetrafluoroethylene (PTFE) has good chemical stability, a low coefficient of friction, high temperature resistance, and good thermal stability, and has been widely used in industry. However, PTFE has poor resiliency and creep properties, thus limiting the use of PTFE pneumatic air compression in sealing materials. At present, PTFE is taken as a matrix, PTFE is modified by using high wear-resistant filler, and for example, fibers, diamond, nano tubes and the like are compounded with the PTFE, so that the wear resistance and the elasticity of the PTFE are improved. The current PTFE composite material is a material which is integrally homogeneous, so that some properties of the PTFE composite material cannot coexist, such as rebound resilience and creep property are mutually balanced, so that the current modified PTFE cannot be well applied to the sealing material of the new energy air compressor.
The embodiment discloses a production process of a PTFE composite sealing material with a transition layer for a pneumatic air compression system, wherein the PTFE composite sealing material comprises the following raw materials: 75% of polytetrafluoroethylene dispersion resin, 5% of carbon fiber, 10% of carbon nano tube and MoS 2 8%；
Wherein, the production process of the PTFE composite sealing material comprises the following steps:
s1, dividing the polytetrafluoroethylene dispersion resin into a first polytetrafluoroethylene dispersion resin, a second polytetrafluoroethylene dispersion resin and a third polytetrafluoroethylene dispersion resin; dividing the carbon fibers into first carbon fibers, second carbon fibers and third carbon fibers; dividing the carbon nanotubes into a first carbon nanotube and a second carbon nanotube; moS is carried out 2 Divided into a first MoS 2 Second MoS 2 And a third MoS 2 ；
S2, dispersing the first polytetrafluoroethylene dispersion resin, the first carbon fiber, the first carbon nano tube and the first MoS 2 Uniformly mixing at normal temperature to obtain a first mixture; dispersing the second polytetrafluoroethylene dispersion resin, second carbon fibers, second carbon nanotubes and second MoS 2 Uniformly mixing at normal temperature to obtain a second mixture; dispersing the third polytetrafluoroethylene dispersion resin, third carbon fiber and third MoS 2 Uniformly mixing at normal temperature to obtain a third mixture;
s3, respectively reacting the first mixture, the second mixture and the third mixture at 220 ℃ for 35min, and preserving heat for later use to obtain a molding material;
s4, injecting the first mixture into a forming die, then injecting the third mixture into the forming die, and finally injecting the second mixture into the forming die for compression forming; wherein, the material filling opening of the forming die is positioned above the forming cavity of the injection die.
In the injection molding process, after all the mixture is added, heating and pressurizing to form, wherein the forming temperature is 180 ℃, and the pressure maintaining time is 5min; the pressurizing pressure is 20Mpa, and the person skilled in the art can adjust and operate according to the experimental operation capability, which is not described in detail.
According to the production process of the PTFE composite sealing material with the transition layer for the pneumatic air compression system, the characteristic that carbon nano tubes can be wound and grown along the edges of carbon fibers is utilized, the carbon fiber content in the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin and the third polytetrafluoroethylene dispersion resin is controlled, so that the deposition amount of the carbon nano tubes in the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin and the third polytetrafluoroethylene dispersion resin is controlled, the transition layer is structurally generated by the PTFE composite sealing material with the laminated first mixture, second mixture and third mixture, namely, the deposition amount of the carbon nano tubes of the third mixture at the middle position is relatively small, the performance of PTFE at the middle position can be furthest reserved, the chemical stability, high temperature resistance and high strength of the third mixture at the middle position are good, the overall low creep property of the PTFE composite sealing material is guaranteed, and the rebound resilience of the material is improved due to the fact that the first mixture and the second mixture at two sides are rich in carbon nano tubes, the rebound resilience of the material is improved, and the rebound resilience of the first mixture and the second mixture are positioned at the outer side of the PTFE composite sealing material is more suitable for the reciprocating motion of a sealing device; and by controlling the carbon fiber content in the first, second and third mixtures, the nanotubes in the first, second and third mixtures are controlled, which in turn controls the distribution of resilience and creep of the PTFE composite seal material such that the resilience and creep of the PTFE composite seal material balance each other.
In this embodiment, in S2, ultrasonic vibration is applied to mix the first mixture, the second mixture, and the third mixture, respectively, and the ultrasonic treatment time is 55 min. The ultrasonic treatment improves the mixing and homogenizing effects.
In this embodiment, the weight ratio of the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin, and the third polytetrafluoroethylene dispersion resin is 1:1:0.7. the polytetrafluoroethylene dispersion resin is distributed, so that the quantity of the middle polytetrafluoroethylene dispersion resin is small, and the rebound resilience ratio is relatively improved. In practical application, the adjustment can be carried out according to practical needs.
In this embodiment, the weights of the first carbon fiber, the second carbon fiber and the third carbon fiber are distributed according to the preset rebound resilience, and the higher the preset rebound resilience, the larger the distributed carbon fiber weight. Since the more carbon fibers, the more carbon nanotubes are produced by winding, the more carbon nanotubes, the better the rebound resilience.
In this embodiment, the weight ratio of the first carbon fiber, the second carbon fiber and the third carbon fiber is 1:1:0.4. such carbon fiber distribution is also to control the content of carbon nano-meter. In practical application, the adjustment can be carried out according to practical needs.
In this embodiment, the weight ratio of the first carbon nanotube to the second carbon nanotube is 1:1. so that the carbon nanotube content of the first polytetrafluoroethylene dispersion resin and the second polytetrafluoroethylene dispersion resin are as equal as possible.
In this embodiment, the first MoS 2 The second MoS 2 And the third MoS 2 The weight ratio of (2) is 1:1:0.4. the MoS 2 Has lubricating effect and is prepared according to polytetrafluoroethylene dispersion resin.
In this embodiment, in S4, the injection molding temperature is 390 ℃ and the molding time is 2.5h.
In this embodiment, in S4, the molding mold is maintained in the injection molding process, where the maintaining pressure is 50MPa and the maintaining time is 3.8 hours. The pressure maintaining strength is increased, so that the carbon nano tube is dispersed more comprehensively, and the strength of the composite material is better.
Example 4
The embodiment discloses a pneumatic air pressure sealing device, which is prepared by adopting the production process of the PTFE composite sealing material with the transition layer for the pneumatic air pressure system in the embodiment 1.
Performance verification
The following performance tests were performed on the hydraulic sealing device obtained in example 1,
1. rebound resilience test: the resilience of the PTFE composite sealing material of the pneumatic air compression system is detected by adopting an FPA-500 spring resilience tester, and the resilience is detected to be 501N, so that the PTFE composite sealing material of the pneumatic air compression system prepared by the application has good resilience and is suitable for being used in a pneumatic air compression system with high pressure.
2. Creep performance test: the mechanical endurance tester is adopted, the force value precision is 1 level, the test stress is 405MPa, the steady creep speed of the sample is 0.000026%/h, and the pneumatic air compression system PTFE composite sealing material prepared by the application has low creep performance.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters refer to like items and, thus, once an item is defined, no further discussion thereof is necessary in the following.
In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the illustrated azimuth or positional relationships, and are merely for convenience of describing the present application and simplifying the description, and these azimuth terms do not indicate and imply that the devices or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe spatial positional relationships of features. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A production process of a PTFE composite sealing material of a pneumatic air compression system with a transition layer is characterized by comprising the following steps: the PTFE composite sealing material comprises the following raw materials:
70% -85% of polytetrafluoroethylene dispersion resin
2% -7% of carbon fiber
Carbon nano tube 8% -13%
MoS 2 5%~10%；
Wherein, the production process of the PTFE composite sealing material comprises the following steps:
s1, dividing the polytetrafluoroethylene dispersion resin into a first polytetrafluoroethylene dispersion resin, a second polytetrafluoroethylene dispersion resin and a third polytetrafluoroethylene dispersion resinTetrafluoroethylene dispersion resin; dividing the carbon fibers into first carbon fibers, second carbon fibers and third carbon fibers; dividing the carbon nanotubes into a first carbon nanotube and a second carbon nanotube; moS is carried out 2 Divided into a first MoS 2 Second MoS 2 And a third MoS 2 ；
S2, dispersing the first polytetrafluoroethylene dispersion resin, the first carbon fiber, the first carbon nano tube and the first MoS 2 Uniformly mixing at normal temperature to obtain a first mixture; dispersing the second polytetrafluoroethylene dispersion resin, second carbon fibers, second carbon nanotubes and second MoS 2 Uniformly mixing at normal temperature to obtain a second mixture; dispersing the third polytetrafluoroethylene dispersion resin, third carbon fiber and third MoS 2 Uniformly mixing at normal temperature to obtain a third mixture;
s3, respectively reacting the first mixture, the second mixture and the third mixture at 200-250 ℃ for 30-40 min, and preserving heat for later use to obtain a molding material;
s4, injecting the first mixture into a forming die, then injecting the third mixture into the forming die, and finally injecting the second mixture into the forming die for compression forming; wherein, the material filling opening of the forming die is positioned above the forming cavity of the injection die.
2. The process for producing the PTFE composite sealing material with the transition layer for the pneumatic air compression system, which is characterized in that: in the step S2, ultrasonic vibration is respectively applied to mix to obtain a first mixture, a second mixture and a third mixture, and the ultrasonic treatment time is 50-60 min.
3. The process for producing the PTFE composite sealing material with the transition layer for the pneumatic air compression system, which is characterized in that: the weight ratio of the first polytetrafluoroethylene dispersion resin, the second polytetrafluoroethylene dispersion resin and the third polytetrafluoroethylene dispersion resin is 1:1: (0.5 to 0.8).
4. The process for producing the PTFE composite sealing material with the transition layer for the pneumatic air compression system, which is characterized in that: the weights of the first carbon fiber, the second carbon fiber and the third carbon fiber are distributed according to the preset rebound resilience, and the higher the preset rebound resilience is, the larger the distributed carbon fiber weight is.
5. The process for producing the PTFE composite sealing material with the transition layer for the pneumatic air pressure system, which is disclosed in claim 4, is characterized in that: the weight ratio of the first carbon fiber, the second carbon fiber and the third carbon fiber is 1:1: (0.2 to 0.5).
6. The process for producing the PTFE composite sealing material with the transition layer for the pneumatic air compression system, which is characterized in that: the weight ratio of the first carbon nanotube to the second carbon nanotube is 1:1.
7. the process for producing a PTFE composite seal material for pneumatic air compression systems having a transition layer according to claim 3, wherein: the first MoS 2 The second MoS 2 And the third MoS 2 The weight ratio of (2) is 1:1: (0.5 to 0.8).
8. The process for producing the PTFE composite sealing material with the transition layer for the pneumatic air compression system, which is characterized in that: in the step S4, the temperature of injection molding is 380-400 ℃ and the molding time is 2-3 hours.
9. The process for producing the PTFE composite sealing material with the transition layer for the pneumatic air compression system, which is characterized in that: in the step S4, the molding die is subjected to pressure maintaining in the injection molding process, the pressure maintaining pressure is 40-60 MPa, and the pressure maintaining time is 3.5-4 hours.
10. A pneumatic air-compression sealing device, characterized by: the PTFE composite sealing material with the transition layer is prepared by adopting the production process of the PTFE composite sealing material with the pneumatic air pressure system with the transition layer as claimed in any one of claims 1 to 9.
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