CN116253582A - Impermeable graphite material impregnated with polytetrafluoroethylene, manufacturing process and heat exchange equipment - Google Patents
Impermeable graphite material impregnated with polytetrafluoroethylene, manufacturing process and heat exchange equipment Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
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- C04B41/82—Coating or impregnation with organic materials
- C04B41/83—Macromolecular compounds
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
- C04B41/4838—Halogenated polymers
- C04B41/4842—Fluorine-containing polymers
- C04B41/4846—Perfluoro-compounds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/02—Constructions of heat-exchange apparatus characterised by the selection of particular materials of carbon, e.g. graphite
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Abstract
The application relates to the technical field of heat exchange equipment, and relates to an impermeable graphite material impregnated with polytetrafluoroethylene, a manufacturing process and heat exchange equipment, wherein the manufacturing process is as follows: 1) Cleaning an isostatic pressing graphite raw material; 2) Heating the curve of the isostatic graphite raw material and the polytetrafluoroethylene impregnant to 360-400 ℃; 3) Sucking the melted polytetrafluoroethylene impregnant into an impregnating kettle for impregnation, starting an ultrasonic generator, pressurizing, keeping for 18-22 hours, and simultaneously preserving heat at 335-400 ℃; closing the ultrasonic generator and discharging the impregnant; 4) And (5) sectional cooling: cooling to 300-360 deg.c in 2 hr, maintaining the temperature and pressure constant, cooling to 210-290 deg.c in 2 hr, maintaining the temperature and pressure constant, cooling to 190-210 deg.c in 2 hr, maintaining the temperature and pressure constant, and naturally cooling to obtain the impervious graphite material; it has the advantage of improving the binding force between polytetrafluoroethylene impregnant and graphite.
Description
Technical Field
The application relates to the technical field of heat exchange equipment, in particular to an impermeable graphite material impregnated with polytetrafluoroethylene, a manufacturing process and heat exchange equipment.
Background
Graphite is a special nonmetallic material, has low density, low heat capacity, high heat conductivity and good processing performance, is an ideal material for manufacturing heat exchange equipment, and is an impermeable graphite after being subjected to impregnation treatment, so that the impermeable graphite is not only high-temperature resistant, good in heat conductivity, but also good in corrosion resistance, and is regarded as an ideal material for manufacturing the heat exchange equipment. It is applied to chemical equipments such as distillation equipment, reaction equipment, baking, etc. and pipelines for transporting corrosive liquids, etc. due to its strong corrosion resistance. Typical impregnating agents include phenol resin (PF), polytetrafluoroethylene (PTFE), water glass, and the like, and among them, polytetrafluoroethylene (PTFE) has a good corrosion resistance and excellent thermal stability, and is expected to have a higher application value.
In the current technology for preparing impermeable graphite by using polytetrafluoroethylene impregnation, the impregnant generally adopted is polytetrafluoroethylene suspension, and the impregnation technology is as follows: and cleaning and airing the processed graphite piece, and then placing the graphite piece into a drying furnace for heating and drying to remove water. After the room temperature, the graphite workpiece is put into an impregnating kettle and vacuumized until the temperature reaches 133.32 multiplied by 10 -3 After Pa or higher, the vacuum was stopped for about 2 hours. And then sucking polytetrafluoroethylene suspension to concentrate the dispersion, removing vacuum after the liquid level is about 10mm higher than that of the graphite piece, pressurizing about 1Mpa, staying for about 2 hours, discharging the dispersion, taking out the graphite piece, and putting into a baking furnace after the liquid is completely flowed. Heating to 150 ℃, keeping for 4-5h, completely drying, and then putting into a sintering furnace for high-temperature plasticizing at 380 ℃ according to a certain heating rate. The soaking and heat treatment are generally carried out for 2-4 times. Although the polytetrafluoroethylene impregnated impermeable graphite material prepared by the impregnant and the process overcomes the defects of phenolic resin and furan resin in the aspects of strong oxidation resistance acid and partial special media thereof, the polytetrafluoroethylene and graphite micropores have poor binding force and poor pore blocking effect due to the large difference of the properties of the polytetrafluoroethylene and the graphite inorganic material, so that the service life of the impermeable graphite is shorter.
Disclosure of Invention
In order to improve the binding force between polytetrafluoroethylene impregnant and graphite and prolong the service life of impermeable graphite, the application provides an impermeable graphite material impregnated with polytetrafluoroethylene, a manufacturing process and heat exchange equipment.
In a first aspect, the present application provides a manufacturing process for impregnating a polytetrafluoroethylene impermeable graphite material, which adopts the following technical scheme:
a process for manufacturing an impregnated polytetrafluoroethylene impermeable graphite material comprising the steps of:
1) Cleaning and drying an isostatic pressing graphite raw material with the granularity less than or equal to 0.004 mm;
2) Placing the isostatic graphite raw material into an impregnation kettle, sealing, heating at the same time, heating to 180-220 ℃ within 3 hours, vacuumizing to 300-500Pa, maintaining vacuum, heating to 280-320 ℃ within 3 hours after heat preservation for 50-70 minutes, heating to 340-360 ℃ within 3 hours after heat preservation for 50-70 minutes, heating to 360-400 ℃ after heat preservation for 50-70 minutes; simultaneously placing polytetrafluoroethylene impregnant into a melting tank, and keeping the temperature range at 335-400 ℃ for 2-4 hours to enable the polytetrafluoroethylene impregnant to be in a molten and flowable state;
3) Sucking the polytetrafluoroethylene impregnant in a molten and flowable state into an impregnating kettle for impregnating, starting an ultrasonic generator, pressurizing to 5-6MPa, maintaining for 18-22 hours, and simultaneously preserving heat at 335-400 ℃; after the soaking link is finished, the ultrasonic generator is closed, and the impregnant is discharged;
4) And (5) sectional cooling: reducing the temperature to 300-360 ℃ within 2 hours, preserving heat and keeping constant pressure for 50-70min, reducing the temperature to 210-290 ℃ within 2 hours, preserving heat and keeping constant pressure for 50-70min, reducing the temperature to 190-210 ℃ within 2 hours, preserving heat for 50-70min, then decompressing, naturally cooling after decompressing, and obtaining the polytetrafluoroethylene-impregnated impermeable graphite material.
Through adopting above-mentioned technical scheme, this application is through forming fluid at 335-400 ℃ within range, carry out high temperature high pressure impregnation under the molten state, produce the physical effect of microjet through ultrasonic cavitation, make the impregnation speed accelerate, be convenient for make the impregnant permeate into the micropore of graphite deeper layer, fully contact with graphite, reach the bonding area increase between the micropore of graphite, the purpose of cohesion increase, the final one-step is impregnated successfully, need not to impregnate many times, the effect of energy saving and emission reduction has been reached, and each performance of the impermeable graphite material of preparation is all preferred, the impermeable graphite of preparation has excellent heat resistance, thermal conductivity, corrosion resistance, impermeability and compressive strength.
As preferable: the incubation temperature in step 3) is 350 ℃.
By adopting the technical scheme, the heat preservation temperature in the step 4) is changed, so that the impregnation effect can be directly influenced, the difficulty and easiness of process control are comprehensively controlled, and the impregnation result is achieved, and the heat preservation temperature is optimal at 350 ℃.
As preferable: soaking the isostatic pressing graphite raw material cleaned in the step 1) in a silane coupling agent aqueous solution, and then drying to obtain the pretreated isostatic pressing graphite raw material.
By adopting the technical scheme, the graphite is pretreated by the silane coupling agent, so that the binding force between the impregnant and the graphite is increased, and the impermeability is achieved.
As preferable: the silane coupling agent is one or more of KH550, KH560, KH570, KH602 and KH792, and the concentration of the silane coupling agent in the aqueous solution of the silane coupling agent is 1.4-1.6g/L.
By adopting the technical scheme, the silane coupling agent has more optional types, and can achieve the expected technical effect.
As preferable: the aqueous solution of the silane coupling agent also contains a nonionic penetrating agent and a cationic surfactant, wherein the concentration of the nonionic penetrating agent is 0.18-0.22g/L, and the concentration of the cationic surfactant is 0.28-0.32g/L.
By adopting the technical scheme, the surface wetting and permeation effects on the graphite can be achieved by adding the nonionic penetrant and the cationic surfactant, so that the surface tension between the aqueous solution of the silane coupling agent and the graphite is greatly reduced, and the silane coupling agent can better reach the micropores in the graphite.
As preferable: the nonionic penetrating agent is sorbitan fatty acid ester, and the cationic surfactant is cetyl trimethyl ammonium chloride.
By adopting the technical scheme, the mutual synergistic interaction between the nonionic penetrant and the cationic surfactant greatly enhances the wetting permeation effect on graphite.
As preferable: the polytetrafluoroethylene impregnant is prepared by blending polytetrafluoroethylene resin and a modifier according to the weight ratio of 85:7, and the modifier is prepared by polymerizing silane coupling agent, hydrolyzed polymaleic anhydride, acrylamide propyl trimethyl ammonium chloride and polyether acrylic resin under the action of an initiator, wherein the hydrolyzed maleic anhydride is pretreated by grafting hyperbranched polymer.
By adopting the technical scheme, the aggregation state of the polytetrafluoroethylene resin can be changed by adding the modifier, so that the special polytetrafluoroethylene impregnant more suitable for graphite is obtained, and the single-phase fluid with lower viscosity is formed, so that the polytetrafluoroethylene impregnant is convenient to permeate into micropores of the graphite.
In a second aspect, the present application provides an impregnated polytetrafluoroethylene impermeable graphite material, using the following technical scheme:
an impregnated polytetrafluoroethylene impermeable graphite material produced by the process for producing an impregnated polytetrafluoroethylene impermeable graphite material as defined in any one of claims 1-6.
In a third aspect, the present application provides a heat exchange apparatus, which adopts the following technical scheme:
a heat exchange device employing a graphite material of the impregnated polytetrafluoroethylene impermeable graphite material of claim 7.
Through adopting above-mentioned technical scheme, the impervious graphite goods part of impervious graphite preparation of this application preparation has reached complete impermeability through 0.6MPa atmospheric pressure and 1.0MPa water pressure detection inspection to keep leakless in quick-cooling quick-heating environment repeatedly, can be better be applied to chemical industry equipment, like distillation plant, reaction equipment, toast etc. and pipeline etc. that its transportation has corrosive liquids.
In summary, the present application includes at least one of the following beneficial technical effects:
1. according to the preparation method, the polytetrafluoroethylene impregnant forms fluid in the range of 335-400 ℃, high-temperature high-pressure impregnation is carried out in a molten state, and the physical effect of microjet is generated through ultrasonic cavitation, so that the impregnation speed is accelerated, the impregnant is convenient to permeate into micropores deeper in graphite and fully contacts with the graphite, the purposes of increasing the bonding area with the graphite and increasing the bonding force are achieved, the impregnation is successful in one step finally, multiple times of impregnation are not needed, the effects of energy conservation and emission reduction are achieved, and the prepared impermeable graphite material has better performances; the graphite is pretreated by the silane coupling agent, so that the binding force between the impregnant and the graphite is increased, and the impermeability is achieved.
2. The impermeable graphite manufactured by the manufacturing process of the impregnated polytetrafluoroethylene impermeable graphite material has heat resistance between 243 and 257 ℃; the porosity is 0.687% or below, and the minimum porosity can reach 0.503%; meanwhile, the highest compressive strength can reach 83.4Mpa; illustrating that the manufacturing process of the present application can further enhance the properties of the impermeable graphite.
Detailed Description
The present application is described in further detail below in conjunction with the detailed description.
Among the raw materials used in the examples of the present application, sorbitan fatty acid ester, model S-80; the molecular weight of the hydrolyzed polymaleic anhydride ranges from 400 to 800; the polyether acrylic resin is EB 436; the processing grade of the polytetrafluoroethylene resin is extrusion grade, molding and pressure-extension; the balance is analytically pure or common commercial products.
Preparation example 1
A polytetrafluoroethylene impregnant is prepared by the following steps:
1) 1.2g of hydrolyzed polymaleic anhydride, 5g of 2-amino terephthalic acid, 1.7g of triethanolamine, 2.7g of diisopropanolamine and 0.12g of n-propyl titanate are added into 11g of DMF, the temperature is raised to 135 ℃, stirring reaction is carried out for 16 hours, 1g of toluene is added, and evaporation concentration is carried out to obtain the hydrolyzed polymaleic anhydride after pretreatment;
under the nitrogen atmosphere, adding 6g of silane coupling agent, 8g of pre-treated hydrolyzed polymaleic anhydride, 3g of acrylamide propyl trimethyl ammonium chloride and 1.5g of polyether acrylic resin into 12g of DMF, stirring, then adding 0.006g of AIBN, heating to 75 ℃, reacting for 16 hours, then dripping diethyl ether into the reaction solution until no precipitation occurs, filtering and drying to obtain a modifier;
2) Dividing 85kg of polytetrafluoroethylene resin into 4 parts by weight averagely, and stirring one part of the 4 parts by weight and 7kg of modifier for 0.5h in a molten state to obtain a mixture, wherein the temperature is 390 ℃;
3) And sequentially adding the rest parts of polytetrafluoroethylene resin into the mixture, stirring for 25min at intervals between every two parts, stirring for 1h after the addition, cooling, and crushing to obtain fine powder, namely the polytetrafluoroethylene impregnant.
Examples
Example 1
A manufacturing process of a polytetrafluoroethylene-impregnated impermeable graphite material comprises the following specific steps:
1) Cleaning the isostatic graphite raw material with granularity less than or equal to 0.004mm with clear water, and drying at 120 ℃;
2) Soaking the cleaned isostatic graphite raw material in a silane coupling agent aqueous solution, wherein the concentration of the silane coupling agent in the silane coupling agent aqueous solution is 1.5g/L, the silane coupling agent is KH550, soaking for 0.5h, and then placing the soaked isostatic graphite raw material into a drying room to be dried for 4h at 120 ℃ to obtain a pretreated isostatic graphite raw material;
3) Placing the pretreated isostatic graphite raw material into an impregnation kettle, sealing, heating at the same time, heating to 200 ℃ within 3 hours, vacuumizing to 400Pa, keeping vacuum, heating to 300 ℃ within 3 hours after heat preservation for 1 hour, heating to 350 ℃ within 3 hours after heat preservation for 1 hour, heating to 380 ℃ after heat preservation for 1 hour; simultaneously placing polytetrafluoroethylene impregnant into a melting tank, heating to 350 ℃ according to the same curve heating condition, and keeping a molten state;
4) Sucking the melted polytetrafluoroethylene impregnant into an impregnating kettle for impregnation, starting an ultrasonic generator, pressurizing to 5MPa, maintaining for 20 hours, and simultaneously preserving heat at 335 ℃; after the soaking link is finished, the ultrasonic generator is closed, and the impregnant is discharged;
5) And (5) sectional cooling: reducing the temperature to 300 ℃ within 2 hours, preserving heat and keeping constant pressure for 1 hour, reducing the temperature to 230 ℃ within 2 hours, preserving heat and keeping constant pressure for 1 hour, reducing the temperature to 200 ℃ within 2 hours, preserving heat for 1 hour, then decompressing, and naturally cooling after decompressing to obtain the polytetrafluoroethylene-impregnated impermeable graphite material;
wherein the polytetrafluoroethylene impregnating agent is from preparation example 1.
Example 2
The process for producing an impregnated polytetrafluoroethylene impermeable graphite material is different from that of example 1 in that the aqueous solution of the silane coupling agent further comprises a nonionic penetrating agent with a concentration of 0.2g/L and a cationic surfactant with a concentration of 0.3g/L, the nonionic penetrating agent is sorbitan fatty acid ester, and the cationic surfactant is cetyltrimethylammonium chloride, and the rest steps are the same as those of example 1.
Example 3
A process for the production of an impregnated polytetrafluoroethylene impermeable graphite material differs from that of example 2 in that it is pressurized to 6MPa in step 4), and the remaining steps are the same as those of example 2.
Example 4
A process for the manufacture of an impregnated polytetrafluoroethylene impermeable graphite material differs from that of example 3 in that the heat-insulating temperature in step 4) is 400℃and the remainder of the steps are the same as in example 3.
Example 5
A process for the manufacture of an impregnated polytetrafluoroethylene impermeable graphite material differs from that of example 3 in that the heat-insulating temperature in step 4) is 350℃and the remainder of the steps are the same as in example 3.
Example 6
The process for producing a polytetrafluoroethylene-impregnated impermeable graphite material was different from that of example 1 in that the polytetrafluoroethylene impregnant was polytetrafluoroethylene resin, modified without adding a modifier, and the other steps were the same as those of example 1.
Example 7
The process for producing a polytetrafluoroethylene-impregnated impermeable graphite material was different from that of example 1 in that the static pressure graphite material was not pretreated with an aqueous solution of a silane coupling agent, and the remaining steps were the same as those of example 1.
Comparative example 1
The process for the manufacture of impregnated polytetrafluoroethylene impermeable graphite material differs from that of example 1 in that no ultrasonic treatment is used in step 4), and the rest of the steps are the same as in example 1.
The impermeable graphite materials were produced according to the production processes of examples 1 to 7 and comparative example 1, respectively, and then subjected to the following examination, the examination results of which are shown in table 1.
TABLE 1 detection results for examples 1-7 and comparative example 1
| Heat resistance (c) | Porosity (%) | Compressive strength (MPa) | |
| Example 1 | 249 | 0.623 | 82.9 |
| Example 2 | 254 | 0.511 | 83.1 |
| Example 3 | 256 | 0.506 | 83.2 |
| Example 4 | 251 | 0.617 | 83.0 |
| Example 5 | 257 | 0.503 | 83.4 |
| Example 6 | 243 | 0.687 | 82.7 |
| Example 7 | 245 | 0.661 | 82.8 |
| Comparative example 1 | 242 | 0.702 | 82.5 |
And the impermeable graphite product component produced by the impermeable graphite prepared in the examples 1-5 of the application achieves complete impermeability through detection and inspection of 0.6MPa air pressure and 1.0MPa water pressure, and keeps leakless in a rapid cooling and rapid heating environment repeatedly, and various performances reach the foreign technical level.
As can be seen from the examination data of examples 1 to 7 and comparative example 1, and table 1, the heat resistance of the impermeable graphite manufactured by the manufacturing process of the impregnated polytetrafluoroethylene impermeable graphite material of the present application is between 243 and 257 ℃; the porosity is 0.687% or below, and the minimum porosity can reach 0.503%; meanwhile, the highest compressive strength can reach 83.4Mpa; illustrating that the manufacturing process of the present application can further enhance the properties of the impermeable graphite.
As can be seen from the detection data of example 1 and comparative example 1, the porosity of the impermeable graphite is higher when the application is not subjected to ultrasonic treatment, which indicates that ultrasonic treatment is a key step in the preparation process and directly affects the impregnation result of the impermeable graphite.
As can be seen from the detection data of examples 1-2, the wettability between the polytetrafluoroethylene impregnant and graphite can be further improved by adding a certain amount of nonionic penetrant and cationic surfactant into the aqueous solution of the silane coupling agent, so that the impregnation effect is better.
As can be seen from the test results of example 2 and example 3, the increase in the pressurized pressure in step 4) helps to reduce the porosity of the impermeable graphite; by combining examples 4-5, the temperature of the insulation in step 4) can be changed to directly influence the impregnation effect, the difficulty of comprehensive process control and the impregnation result, and the temperature of the insulation is optimal at 350 ℃.
As can be seen from examples 1 and 6, the manufacturing process of the present application has certain advantages even though the impregnant is not modified and polytetrafluoroethylene resin is used.
The foregoing embodiments are all preferred examples of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (9)
1. A manufacturing process of a polytetrafluoroethylene-impregnated impermeable graphite material is characterized by comprising the following steps of: the method comprises the following steps:
1) Cleaning and drying an isostatic pressing graphite raw material with the granularity less than or equal to 0.004 mm;
2) Placing the isostatic graphite raw material into an impregnation kettle, sealing, heating at the same time, heating to 180-220 ℃ within 3 hours, vacuumizing to 300-500Pa, maintaining vacuum, heating to 280-320 ℃ within 3 hours after heat preservation for 50-70 minutes, heating to 340-360 ℃ within 3 hours after heat preservation for 50-70 minutes, heating to 360-400 ℃ after heat preservation for 50-70 minutes; simultaneously placing polytetrafluoroethylene impregnant into a melting tank, and keeping the temperature range at 335-400 ℃ for 2-4 hours to enable the polytetrafluoroethylene impregnant to be in a molten and flowable state;
3) Sucking the polytetrafluoroethylene impregnant in a molten and flowable state into an impregnating kettle for impregnating, starting an ultrasonic generator, pressurizing to 5-6MPa, maintaining for 18-22 hours, and simultaneously preserving heat at 335-400 ℃; after the soaking link is finished, the ultrasonic generator is closed, and the impregnant is discharged;
4) And (5) sectional cooling: reducing the temperature to 300-360 ℃ within 2 hours, preserving heat and keeping constant pressure for 50-70min, reducing the temperature to 210-290 ℃ within 2 hours, preserving heat and keeping constant pressure for 50-70min, reducing the temperature to 190-210 ℃ within 2 hours, preserving heat for 50-70min, then decompressing, naturally cooling after decompressing, and obtaining the polytetrafluoroethylene-impregnated impermeable graphite material.
2. A process for the manufacture of an impregnated polytetrafluoroethylene impermeable graphite material as defined in claim 1 wherein: the incubation temperature in step 4) is 350 ℃.
3. A process for the manufacture of an impregnated polytetrafluoroethylene impermeable graphite material as defined in claim 1 wherein: soaking the isostatic pressing graphite raw material cleaned in the step 1) in a silane coupling agent aqueous solution, and then drying to obtain the pretreated isostatic pressing graphite raw material.
4. A process for the manufacture of an impregnated polytetrafluoroethylene impermeable graphite material as defined in claim 3 wherein: the silane coupling agent is one or more of KH550, KH560, KH570, KH602 and KH792, and the concentration of the silane coupling agent in the aqueous solution of the silane coupling agent is 1.4-1.6g/L.
5. The process for manufacturing an impregnated polytetrafluoroethylene impermeable graphite material as defined in claim 4, wherein: the aqueous solution of the silane coupling agent also contains a nonionic penetrating agent and a cationic surfactant, wherein the concentration of the nonionic penetrating agent is 0.18-0.22g/L, and the concentration of the cationic surfactant is 0.28-0.32g/L.
6. The process for manufacturing an impregnated polytetrafluoroethylene impermeable graphite material as defined in claim 5, wherein: the nonionic penetrating agent is sorbitan fatty acid ester, and the cationic surfactant is cetyl trimethyl ammonium chloride.
7. A process for the manufacture of an impregnated polytetrafluoroethylene impermeable graphite material as defined in claim 1 wherein: the polytetrafluoroethylene impregnant is prepared by blending polytetrafluoroethylene resin and a modifier according to the weight ratio of 85:7, and the modifier is prepared by polymerizing silane coupling agent, hydrolyzed polymaleic anhydride, acrylamide propyl trimethyl ammonium chloride and polyether acrylic resin under the action of an initiator, wherein the hydrolyzed maleic anhydride is pretreated by grafting hyperbranched polymer.
8. An impermeable graphite material impregnated with polytetrafluoroethylene, characterized by: the impermeable graphite material is produced by the process for producing an impregnated polytetrafluoroethylene impermeable graphite material according to any one of claims 1 to 6.
9. A heat exchange apparatus, characterized in that: the graphite material adopted by the heat exchange equipment is the impregnated polytetrafluoroethylene impermeable graphite material as claimed in claim 8.
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| CN117964399A (en) * | 2024-04-01 | 2024-05-03 | 山东红点新材料有限公司 | Impregnation method of isostatic pressing graphite product |
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| CN117964399A (en) * | 2024-04-01 | 2024-05-03 | 山东红点新材料有限公司 | Impregnation method of isostatic pressing graphite product |
| CN117964399B (en) * | 2024-04-01 | 2024-06-07 | 山东红点新材料有限公司 | Impregnation method of isostatic pressing graphite product |
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